commit 619d195e96087e7a3fef86c7cd4f86df26d8af10 Author: talksik Date: Sat Dec 12 13:22:56 2020 -0500 Initial commit diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 0000000..dfe0770 --- /dev/null +++ b/.gitattributes @@ -0,0 +1,2 @@ +# Auto detect text files and perform LF normalization +* text=auto diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 0000000..84c8f83 --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,3 @@ +{ + "python.pythonPath": "venv/bin/python3" +} \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..5f8e2bf --- /dev/null +++ b/README.md @@ -0,0 +1,2 @@ +# basic_flask_app + diff --git a/__pycache__/hello.cpython-37.pyc b/__pycache__/hello.cpython-37.pyc new file mode 100644 index 0000000..a0305a3 Binary files /dev/null and b/__pycache__/hello.cpython-37.pyc differ diff --git a/hello.py b/hello.py new file mode 100644 index 0000000..690d18d --- /dev/null +++ b/hello.py @@ -0,0 +1,7 @@ +from flask import Flask + +app = Flask(__name__) + +@app.route('/') +def hello_world(): + return 'Hello World' diff --git a/venv/bin/activate b/venv/bin/activate new file mode 100644 index 0000000..ab7f392 --- /dev/null +++ b/venv/bin/activate @@ -0,0 +1,76 @@ +# This file must be used with "source bin/activate" *from bash* +# you cannot run it directly + +deactivate () { + # reset old environment variables + if [ -n "${_OLD_VIRTUAL_PATH:-}" ] ; then + PATH="${_OLD_VIRTUAL_PATH:-}" + export PATH + unset _OLD_VIRTUAL_PATH + fi + if [ -n "${_OLD_VIRTUAL_PYTHONHOME:-}" ] ; then + PYTHONHOME="${_OLD_VIRTUAL_PYTHONHOME:-}" + export PYTHONHOME + unset _OLD_VIRTUAL_PYTHONHOME + fi + + # This should detect bash and zsh, which have a hash command that must + # be called to get it to forget past commands. Without forgetting + # past commands the $PATH changes we made may not be respected + if [ -n "${BASH:-}" -o -n "${ZSH_VERSION:-}" ] ; then + hash -r + fi + + if [ -n "${_OLD_VIRTUAL_PS1:-}" ] ; then + PS1="${_OLD_VIRTUAL_PS1:-}" + export PS1 + unset _OLD_VIRTUAL_PS1 + fi + + unset VIRTUAL_ENV + if [ ! "$1" = "nondestructive" ] ; then + # Self destruct! + unset -f deactivate + fi +} + +# unset irrelevant variables +deactivate nondestructive + +VIRTUAL_ENV="/Users/talksik/Development/basic_flask_app/venv" +export VIRTUAL_ENV + +_OLD_VIRTUAL_PATH="$PATH" +PATH="$VIRTUAL_ENV/bin:$PATH" +export PATH + +# unset PYTHONHOME if set +# this will fail if PYTHONHOME is set to the empty string (which is bad anyway) +# could use `if (set -u; : $PYTHONHOME) ;` in bash +if [ -n "${PYTHONHOME:-}" ] ; then + _OLD_VIRTUAL_PYTHONHOME="${PYTHONHOME:-}" + unset PYTHONHOME +fi + +if [ -z "${VIRTUAL_ENV_DISABLE_PROMPT:-}" ] ; then + _OLD_VIRTUAL_PS1="${PS1:-}" + if [ "x(venv) " != x ] ; then + PS1="(venv) ${PS1:-}" + else + if [ "`basename \"$VIRTUAL_ENV\"`" = "__" ] ; then + # special case for Aspen magic directories + # see http://www.zetadev.com/software/aspen/ + PS1="[`basename \`dirname \"$VIRTUAL_ENV\"\``] $PS1" + else + PS1="(`basename \"$VIRTUAL_ENV\"`)$PS1" + fi + fi + export PS1 +fi + +# This should detect bash and zsh, which have a hash command that must +# be called to get it to forget past commands. Without forgetting +# past commands the $PATH changes we made may not be respected +if [ -n "${BASH:-}" -o -n "${ZSH_VERSION:-}" ] ; then + hash -r +fi diff --git a/venv/bin/activate.csh b/venv/bin/activate.csh new file mode 100644 index 0000000..9c866af --- /dev/null +++ b/venv/bin/activate.csh @@ -0,0 +1,37 @@ +# This file must be used with "source bin/activate.csh" *from csh*. +# You cannot run it directly. +# Created by Davide Di Blasi . +# Ported to Python 3.3 venv by Andrew Svetlov + +alias deactivate 'test $?_OLD_VIRTUAL_PATH != 0 && setenv PATH "$_OLD_VIRTUAL_PATH" && unset _OLD_VIRTUAL_PATH; rehash; test $?_OLD_VIRTUAL_PROMPT != 0 && set prompt="$_OLD_VIRTUAL_PROMPT" && unset _OLD_VIRTUAL_PROMPT; unsetenv VIRTUAL_ENV; test "\!:*" != "nondestructive" && unalias deactivate' + +# Unset irrelevant variables. +deactivate nondestructive + +setenv VIRTUAL_ENV "/Users/talksik/Development/basic_flask_app/venv" + +set _OLD_VIRTUAL_PATH="$PATH" +setenv PATH "$VIRTUAL_ENV/bin:$PATH" + + +set _OLD_VIRTUAL_PROMPT="$prompt" + +if (! "$?VIRTUAL_ENV_DISABLE_PROMPT") then + if ("venv" != "") then + set env_name = "venv" + else + if (`basename "VIRTUAL_ENV"` == "__") then + # special case for Aspen magic directories + # see http://www.zetadev.com/software/aspen/ + set env_name = `basename \`dirname "$VIRTUAL_ENV"\`` + else + set env_name = `basename "$VIRTUAL_ENV"` + endif + endif + set prompt = "[$env_name] $prompt" + unset env_name +endif + +alias pydoc python -m pydoc + +rehash diff --git a/venv/bin/activate.fish b/venv/bin/activate.fish new file mode 100644 index 0000000..78050ad --- /dev/null +++ b/venv/bin/activate.fish @@ -0,0 +1,75 @@ +# This file must be used with ". bin/activate.fish" *from fish* (http://fishshell.org) +# you cannot run it directly + +function deactivate -d "Exit virtualenv and return to normal shell environment" + # reset old environment variables + if test -n "$_OLD_VIRTUAL_PATH" + set -gx PATH $_OLD_VIRTUAL_PATH + set -e _OLD_VIRTUAL_PATH + end + if test -n "$_OLD_VIRTUAL_PYTHONHOME" + set -gx PYTHONHOME $_OLD_VIRTUAL_PYTHONHOME + set -e _OLD_VIRTUAL_PYTHONHOME + end + + if test -n "$_OLD_FISH_PROMPT_OVERRIDE" + functions -e fish_prompt + set -e _OLD_FISH_PROMPT_OVERRIDE + functions -c _old_fish_prompt fish_prompt + functions -e _old_fish_prompt + end + + set -e VIRTUAL_ENV + if test "$argv[1]" != "nondestructive" + # Self destruct! + functions -e deactivate + end +end + +# unset irrelevant variables +deactivate nondestructive + +set -gx VIRTUAL_ENV "/Users/talksik/Development/basic_flask_app/venv" + +set -gx _OLD_VIRTUAL_PATH $PATH +set -gx PATH "$VIRTUAL_ENV/bin" $PATH + +# unset PYTHONHOME if set +if set -q PYTHONHOME + set -gx _OLD_VIRTUAL_PYTHONHOME $PYTHONHOME + set -e PYTHONHOME +end + +if test -z "$VIRTUAL_ENV_DISABLE_PROMPT" + # fish uses a function instead of an env var to generate the prompt. + + # save the current fish_prompt function as the function _old_fish_prompt + functions -c fish_prompt _old_fish_prompt + + # with the original prompt function renamed, we can override with our own. + function fish_prompt + # Save the return status of the last command + set -l old_status $status + + # Prompt override? + if test -n "(venv) " + printf "%s%s" "(venv) " (set_color normal) + else + # ...Otherwise, prepend env + set -l _checkbase (basename "$VIRTUAL_ENV") + if test $_checkbase = "__" + # special case for Aspen magic directories + # see http://www.zetadev.com/software/aspen/ + printf "%s[%s]%s " (set_color -b blue white) (basename (dirname "$VIRTUAL_ENV")) (set_color normal) + else + printf "%s(%s)%s" (set_color -b blue white) (basename "$VIRTUAL_ENV") (set_color normal) + end + end + + # Restore the return status of the previous command. + echo "exit $old_status" | . + _old_fish_prompt + end + + set -gx _OLD_FISH_PROMPT_OVERRIDE "$VIRTUAL_ENV" +end diff --git a/venv/bin/easy_install b/venv/bin/easy_install new file mode 100755 index 0000000..d95e6a8 --- /dev/null +++ b/venv/bin/easy_install @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from setuptools.command.easy_install import main + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(main()) diff --git a/venv/bin/easy_install-3.7 b/venv/bin/easy_install-3.7 new file mode 100755 index 0000000..d95e6a8 --- /dev/null +++ b/venv/bin/easy_install-3.7 @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from setuptools.command.easy_install import main + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(main()) diff --git a/venv/bin/epylint b/venv/bin/epylint new file mode 100755 index 0000000..de59449 --- /dev/null +++ b/venv/bin/epylint @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from pylint import run_epylint + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(run_epylint()) diff --git a/venv/bin/flask b/venv/bin/flask new file mode 100755 index 0000000..a6c4aed --- /dev/null +++ b/venv/bin/flask @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from flask.cli import main + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(main()) diff --git a/venv/bin/isort b/venv/bin/isort new file mode 100755 index 0000000..aee64f2 --- /dev/null +++ b/venv/bin/isort @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from isort.main import main + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(main()) diff --git a/venv/bin/pip b/venv/bin/pip new file mode 100755 index 0000000..71f9ce3 --- /dev/null +++ b/venv/bin/pip @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from pip._internal import main + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(main()) diff --git a/venv/bin/pip3 b/venv/bin/pip3 new file mode 100755 index 0000000..71f9ce3 --- /dev/null +++ b/venv/bin/pip3 @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from pip._internal import main + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(main()) diff --git a/venv/bin/pip3.7 b/venv/bin/pip3.7 new file mode 100755 index 0000000..71f9ce3 --- /dev/null +++ b/venv/bin/pip3.7 @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from pip._internal import main + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(main()) diff --git a/venv/bin/pylint b/venv/bin/pylint new file mode 100755 index 0000000..d9b79f6 --- /dev/null +++ b/venv/bin/pylint @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from pylint import run_pylint + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(run_pylint()) diff --git a/venv/bin/pyreverse b/venv/bin/pyreverse new file mode 100755 index 0000000..e6ce636 --- /dev/null +++ b/venv/bin/pyreverse @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from pylint import run_pyreverse + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(run_pyreverse()) diff --git a/venv/bin/python b/venv/bin/python new file mode 120000 index 0000000..b8a0adb --- /dev/null +++ b/venv/bin/python @@ -0,0 +1 @@ +python3 \ No newline at end of file diff --git a/venv/bin/python3 b/venv/bin/python3 new file mode 120000 index 0000000..79ab74b --- /dev/null +++ b/venv/bin/python3 @@ -0,0 +1 @@ +/usr/local/bin/python3 \ No newline at end of file diff --git a/venv/bin/symilar b/venv/bin/symilar new file mode 100755 index 0000000..a4ca480 --- /dev/null +++ b/venv/bin/symilar @@ -0,0 +1,10 @@ +#!/Users/talksik/Development/basic_flask_app/venv/bin/python3 +# -*- coding: utf-8 -*- +import re +import sys + +from pylint import run_symilar + +if __name__ == '__main__': + sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0]) + sys.exit(run_symilar()) diff --git a/venv/lib/python3.7/site-packages/Click-7.0.dist-info/INSTALLER b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/INSTALLER new file mode 100644 index 0000000..a1b589e --- /dev/null +++ b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/INSTALLER @@ -0,0 +1 @@ +pip diff --git a/venv/lib/python3.7/site-packages/Click-7.0.dist-info/LICENSE.txt b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/LICENSE.txt new file mode 100644 index 0000000..87ce152 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/LICENSE.txt @@ -0,0 +1,39 @@ +Copyright © 2014 by the Pallets team. + +Some rights reserved. + +Redistribution and use in source and binary forms of the software as +well as documentation, with or without modification, are permitted +provided that the following conditions are met: + +- Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + +- Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + +- Neither the name of the copyright holder nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + +THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND +CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, +BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND +FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF +USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON +ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +THIS SOFTWARE AND DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF +SUCH DAMAGE. + +---- + +Click uses parts of optparse written by Gregory P. Ward and maintained +by the Python Software Foundation. This is limited to code in parser.py. + +Copyright © 2001-2006 Gregory P. Ward. All rights reserved. +Copyright © 2002-2006 Python Software Foundation. All rights reserved. diff --git a/venv/lib/python3.7/site-packages/Click-7.0.dist-info/METADATA b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/METADATA new file mode 100644 index 0000000..625bdad --- /dev/null +++ b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/METADATA @@ -0,0 +1,121 @@ +Metadata-Version: 2.1 +Name: Click +Version: 7.0 +Summary: Composable command line interface toolkit +Home-page: https://palletsprojects.com/p/click/ +Author: Armin Ronacher +Author-email: armin.ronacher@active-4.com +Maintainer: Pallets Team +Maintainer-email: contact@palletsprojects.com +License: BSD +Project-URL: Documentation, https://click.palletsprojects.com/ +Project-URL: Code, https://github.com/pallets/click +Project-URL: Issue tracker, https://github.com/pallets/click/issues +Platform: UNKNOWN +Classifier: Development Status :: 5 - Production/Stable +Classifier: Intended Audience :: Developers +Classifier: License :: OSI Approved :: BSD License +Classifier: Operating System :: OS Independent +Classifier: Programming Language :: Python +Classifier: Programming Language :: Python :: 2 +Classifier: Programming Language :: Python :: 2.7 +Classifier: Programming Language :: Python :: 3 +Classifier: Programming Language :: Python :: 3.4 +Classifier: Programming Language :: Python :: 3.5 +Classifier: Programming Language :: Python :: 3.6 +Classifier: Programming Language :: Python :: 3.7 +Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.* + +\$ click\_ +========== + +Click is a Python package for creating beautiful command line interfaces +in a composable way with as little code as necessary. It's the "Command +Line Interface Creation Kit". It's highly configurable but comes with +sensible defaults out of the box. + +It aims to make the process of writing command line tools quick and fun +while also preventing any frustration caused by the inability to +implement an intended CLI API. + +Click in three points: + +- Arbitrary nesting of commands +- Automatic help page generation +- Supports lazy loading of subcommands at runtime + + +Installing +---------- + +Install and update using `pip`_: + +.. code-block:: text + + $ pip install click + +Click supports Python 3.4 and newer, Python 2.7, and PyPy. + +.. _pip: https://pip.pypa.io/en/stable/quickstart/ + + +A Simple Example +---------------- + +What does it look like? Here is an example of a simple Click program: + +.. code-block:: python + + import click + + @click.command() + @click.option("--count", default=1, help="Number of greetings.") + @click.option("--name", prompt="Your name", + help="The person to greet.") + def hello(count, name): + """Simple program that greets NAME for a total of COUNT times.""" + for _ in range(count): + click.echo("Hello, %s!" % name) + + if __name__ == '__main__': + hello() + +And what it looks like when run: + +.. code-block:: text + + $ python hello.py --count=3 + Your name: Click + Hello, Click! + Hello, Click! + Hello, Click! + + +Donate +------ + +The Pallets organization develops and supports Click and other popular +packages. In order to grow the community of contributors and users, and +allow the maintainers to devote more time to the projects, `please +donate today`_. + +.. _please donate today: https://palletsprojects.com/donate + + +Links +----- + +* Website: https://palletsprojects.com/p/click/ +* Documentation: https://click.palletsprojects.com/ +* License: `BSD `_ +* Releases: https://pypi.org/project/click/ +* Code: https://github.com/pallets/click +* Issue tracker: https://github.com/pallets/click/issues +* Test status: + + * Linux, Mac: https://travis-ci.org/pallets/click + * Windows: https://ci.appveyor.com/project/pallets/click + +* Test coverage: https://codecov.io/gh/pallets/click + + diff --git a/venv/lib/python3.7/site-packages/Click-7.0.dist-info/RECORD b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/RECORD new file mode 100644 index 0000000..ecf17c1 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/RECORD @@ -0,0 +1,40 @@ 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b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/top_level.txt new file mode 100644 index 0000000..dca9a90 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Click-7.0.dist-info/top_level.txt @@ -0,0 +1 @@ +click diff --git a/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/INSTALLER b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/INSTALLER new file mode 100644 index 0000000..a1b589e --- /dev/null +++ b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/INSTALLER @@ -0,0 +1 @@ +pip diff --git a/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/LICENSE b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/LICENSE new file mode 100644 index 0000000..8f9252f --- /dev/null +++ b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/LICENSE @@ -0,0 +1,31 @@ +Copyright © 2010 by the Pallets team. + +Some rights reserved. + +Redistribution and use in source and binary forms of the software as +well as documentation, with or without modification, are permitted +provided that the following conditions are met: + +* Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + +* Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + +* Neither the name of the copyright holder nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + +THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND +CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, +BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND +FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF +USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON +ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +THIS SOFTWARE AND DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF +SUCH DAMAGE. diff --git a/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/METADATA b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/METADATA new file mode 100644 index 0000000..0a7e5b6 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/METADATA @@ -0,0 +1,124 @@ +Metadata-Version: 2.1 +Name: Flask +Version: 1.0.3 +Summary: A simple framework for building complex web applications. +Home-page: https://www.palletsprojects.com/p/flask/ +Author: Armin Ronacher +Author-email: armin.ronacher@active-4.com +Maintainer: Pallets team +Maintainer-email: contact@palletsprojects.com +License: BSD +Project-URL: Documentation, http://flask.pocoo.org/docs/ +Project-URL: Code, https://github.com/pallets/flask +Project-URL: Issue tracker, https://github.com/pallets/flask/issues +Platform: any +Classifier: Development Status :: 5 - Production/Stable +Classifier: Environment :: Web Environment +Classifier: Framework :: Flask +Classifier: Intended Audience :: Developers +Classifier: License :: OSI Approved :: BSD License +Classifier: Operating System :: OS Independent +Classifier: Programming Language :: Python +Classifier: Programming Language :: Python :: 2 +Classifier: Programming Language :: Python :: 2.7 +Classifier: Programming Language :: Python :: 3 +Classifier: Programming Language :: Python :: 3.4 +Classifier: Programming Language :: Python :: 3.5 +Classifier: Programming Language :: Python :: 3.6 +Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content +Classifier: Topic :: Internet :: WWW/HTTP :: WSGI :: Application +Classifier: Topic :: Software Development :: Libraries :: Application Frameworks +Classifier: Topic :: Software Development :: Libraries :: Python Modules +Requires-Dist: Werkzeug (>=0.14) +Requires-Dist: Jinja2 (>=2.10) +Requires-Dist: itsdangerous (>=0.24) +Requires-Dist: click (>=5.1) +Provides-Extra: dev +Requires-Dist: pytest (>=3) ; extra == 'dev' +Requires-Dist: coverage ; extra == 'dev' +Requires-Dist: tox ; extra == 'dev' +Requires-Dist: sphinx ; extra == 'dev' +Requires-Dist: pallets-sphinx-themes ; extra == 'dev' +Requires-Dist: sphinxcontrib-log-cabinet ; extra == 'dev' +Provides-Extra: docs +Requires-Dist: sphinx ; extra == 'docs' +Requires-Dist: pallets-sphinx-themes ; extra == 'docs' +Requires-Dist: sphinxcontrib-log-cabinet ; extra == 'docs' +Provides-Extra: dotenv +Requires-Dist: python-dotenv ; extra == 'dotenv' + +Flask +===== + +Flask is a lightweight `WSGI`_ web application framework. It is designed +to make getting started quick and easy, with the ability to scale up to +complex applications. It began as a simple wrapper around `Werkzeug`_ +and `Jinja`_ and has become one of the most popular Python web +application frameworks. + +Flask offers suggestions, but doesn't enforce any dependencies or +project layout. It is up to the developer to choose the tools and +libraries they want to use. There are many extensions provided by the +community that make adding new functionality easy. + + +Installing +---------- + +Install and update using `pip`_: + +.. code-block:: text + + pip install -U Flask + + +A Simple Example +---------------- + +.. code-block:: python + + from flask import Flask + + app = Flask(__name__) + + @app.route('/') + def hello(): + return 'Hello, World!' + +.. code-block:: text + + $ FLASK_APP=hello.py flask run + * Serving Flask app "hello" + * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) + + +Donate +------ + +The Pallets organization develops and supports Flask and the libraries +it uses. In order to grow the community of contributors and users, and +allow the maintainers to devote more time to the projects, `please +donate today`_. + +.. _please donate today: https://psfmember.org/civicrm/contribute/transact?reset=1&id=20 + + +Links +----- + +* Website: https://www.palletsprojects.com/p/flask/ +* Documentation: http://flask.pocoo.org/docs/ +* License: `BSD `_ +* Releases: https://pypi.org/project/Flask/ +* Code: https://github.com/pallets/flask +* Issue tracker: https://github.com/pallets/flask/issues +* Test status: https://dev.azure.com/pallets/pallets/_build?definitionId=2 +* Test coverage: https://codecov.io/gh/pallets/flask +* Official chat: https://discord.gg/t6rrQZH + +.. _WSGI: https://wsgi.readthedocs.io +.. _Werkzeug: https://www.palletsprojects.com/p/werkzeug/ +.. _Jinja: https://www.palletsprojects.com/p/jinja/ +.. _pip: https://pip.pypa.io/en/stable/quickstart/ + + diff --git a/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/RECORD 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@@ +[console_scripts] +flask = flask.cli:main + diff --git a/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/top_level.txt b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/top_level.txt new file mode 100644 index 0000000..7e10602 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Flask-1.0.3.dist-info/top_level.txt @@ -0,0 +1 @@ +flask diff --git a/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/INSTALLER b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/INSTALLER new file mode 100644 index 0000000..a1b589e --- /dev/null +++ b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/INSTALLER @@ -0,0 +1 @@ +pip diff --git a/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/LICENSE b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/LICENSE new file mode 100644 index 0000000..31bf900 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/LICENSE @@ -0,0 +1,31 @@ +Copyright (c) 2009 by the Jinja Team, see AUTHORS for more details. + +Some rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following + disclaimer in the documentation and/or other materials provided + with the distribution. + + * The names of the contributors may not be used to endorse or + promote products derived from this software without specific + prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/METADATA b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/METADATA new file mode 100644 index 0000000..fb4a867 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/METADATA @@ -0,0 +1,67 @@ +Metadata-Version: 2.1 +Name: Jinja2 +Version: 2.10.1 +Summary: A small but fast and easy to use stand-alone template engine written in pure python. +Home-page: http://jinja.pocoo.org/ +Author: Armin Ronacher +Author-email: armin.ronacher@active-4.com +License: BSD +Platform: UNKNOWN +Classifier: Development Status :: 5 - Production/Stable +Classifier: Environment :: Web Environment +Classifier: Intended Audience :: Developers +Classifier: License :: OSI Approved :: BSD License +Classifier: Operating System :: OS Independent +Classifier: Programming Language :: Python +Classifier: Programming Language :: Python :: 2 +Classifier: Programming Language :: Python :: 2.6 +Classifier: Programming Language :: Python :: 2.7 +Classifier: Programming Language :: Python :: 3 +Classifier: Programming Language :: Python :: 3.3 +Classifier: Programming Language :: Python :: 3.4 +Classifier: Programming Language :: Python :: 3.5 +Classifier: Programming Language :: Python :: 3.6 +Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content +Classifier: Topic :: Software Development :: Libraries :: Python Modules +Classifier: Topic :: Text Processing :: Markup :: HTML +Requires-Dist: MarkupSafe (>=0.23) +Provides-Extra: i18n +Requires-Dist: Babel (>=0.8) ; extra == 'i18n' + + +Jinja2 +~~~~~~ + +Jinja2 is a template engine written in pure Python. It provides a +`Django`_ inspired non-XML syntax but supports inline expressions and +an optional `sandboxed`_ environment. + +Nutshell +-------- + +Here a small example of a Jinja template:: + + {% extends 'base.html' %} + {% block title %}Memberlist{% endblock %} + {% block content %} + + {% endblock %} + +Philosophy +---------- + +Application logic is for the controller but don't try to make the life +for the template designer too hard by giving him too few functionality. + +For more informations visit the new `Jinja2 webpage`_ and `documentation`_. + +.. _sandboxed: https://en.wikipedia.org/wiki/Sandbox_(computer_security) +.. _Django: https://www.djangoproject.com/ +.. _Jinja2 webpage: http://jinja.pocoo.org/ +.. _documentation: http://jinja.pocoo.org/2/documentation/ + + diff --git a/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/RECORD b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/RECORD new file mode 100644 index 0000000..1507ef1 --- /dev/null +++ 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a/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/WHEEL b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/WHEEL new file mode 100644 index 0000000..c8240f0 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/WHEEL @@ -0,0 +1,6 @@ +Wheel-Version: 1.0 +Generator: bdist_wheel (0.33.1) +Root-Is-Purelib: true +Tag: py2-none-any +Tag: py3-none-any + diff --git a/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/entry_points.txt b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/entry_points.txt new file mode 100644 index 0000000..32e6b75 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/entry_points.txt @@ -0,0 +1,4 @@ + + [babel.extractors] + jinja2 = jinja2.ext:babel_extract[i18n] + \ No newline at end of file diff --git a/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/top_level.txt b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/top_level.txt new file mode 100644 index 0000000..7f7afbf --- /dev/null +++ b/venv/lib/python3.7/site-packages/Jinja2-2.10.1.dist-info/top_level.txt @@ -0,0 +1 @@ +jinja2 diff --git a/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/INSTALLER b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/INSTALLER new file mode 100644 index 0000000..a1b589e --- /dev/null +++ b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/INSTALLER @@ -0,0 +1 @@ +pip diff --git a/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/LICENSE.rst b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/LICENSE.rst new file mode 100644 index 0000000..9d227a0 --- /dev/null +++ b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/LICENSE.rst @@ -0,0 +1,28 @@ +Copyright 2010 Pallets + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + +1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + +2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + +3. Neither the name of the copyright holder nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED +TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/METADATA b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/METADATA new file mode 100644 index 0000000..b208d93 --- /dev/null +++ b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/METADATA @@ -0,0 +1,103 @@ +Metadata-Version: 2.1 +Name: MarkupSafe +Version: 1.1.1 +Summary: Safely add untrusted strings to HTML/XML markup. +Home-page: https://palletsprojects.com/p/markupsafe/ +Author: Armin Ronacher +Author-email: armin.ronacher@active-4.com +Maintainer: The Pallets Team +Maintainer-email: contact@palletsprojects.com +License: BSD-3-Clause +Project-URL: Documentation, https://markupsafe.palletsprojects.com/ +Project-URL: Code, https://github.com/pallets/markupsafe +Project-URL: Issue tracker, https://github.com/pallets/markupsafe/issues +Platform: UNKNOWN +Classifier: Development Status :: 5 - Production/Stable +Classifier: Environment :: Web Environment +Classifier: Intended Audience :: Developers +Classifier: License :: OSI Approved :: BSD License +Classifier: Operating System :: OS Independent +Classifier: Programming Language :: Python +Classifier: Programming Language :: Python :: 2 +Classifier: Programming Language :: Python :: 2.7 +Classifier: Programming Language :: Python :: 3 +Classifier: Programming Language :: Python :: 3.4 +Classifier: Programming Language :: Python :: 3.5 +Classifier: Programming Language :: Python :: 3.6 +Classifier: Programming Language :: Python :: 3.7 +Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content +Classifier: Topic :: Software Development :: Libraries :: Python Modules +Classifier: Topic :: Text Processing :: Markup :: HTML +Requires-Python: >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.* + +MarkupSafe +========== + +MarkupSafe implements a text object that escapes characters so it is +safe to use in HTML and XML. Characters that have special meanings are +replaced so that they display as the actual characters. This mitigates +injection attacks, meaning untrusted user input can safely be displayed +on a page. + + +Installing +---------- + +Install and update using `pip`_: + +.. code-block:: text + + pip install -U MarkupSafe + +.. _pip: https://pip.pypa.io/en/stable/quickstart/ + + +Examples +-------- + +.. code-block:: pycon + + >>> from markupsafe import Markup, escape + >>> # escape replaces special characters and wraps in Markup + >>> escape('') + Markup(u'<script>alert(document.cookie);</script>') + >>> # wrap in Markup to mark text "safe" and prevent escaping + >>> Markup('Hello') + Markup('hello') + >>> escape(Markup('Hello')) + Markup('hello') + >>> # Markup is a text subclass (str on Python 3, unicode on Python 2) + >>> # methods and operators escape their arguments + >>> template = Markup("Hello %s") + >>> template % '"World"' + Markup('Hello "World"') + + +Donate +------ + +The Pallets organization develops and supports MarkupSafe and other +libraries that use it. In order to grow the community of contributors +and users, and allow the maintainers to devote more time to the +projects, `please donate today`_. + +.. _please donate today: https://palletsprojects.com/donate + + +Links +----- + +* Website: https://palletsprojects.com/p/markupsafe/ +* Documentation: https://markupsafe.palletsprojects.com/ +* License: `BSD-3-Clause `_ +* Releases: https://pypi.org/project/MarkupSafe/ +* Code: https://github.com/pallets/markupsafe +* Issue tracker: https://github.com/pallets/markupsafe/issues +* Test status: + + * Linux, Mac: https://travis-ci.org/pallets/markupsafe + * Windows: https://ci.appveyor.com/project/pallets/markupsafe + +* Test coverage: https://codecov.io/gh/pallets/markupsafe + + diff --git a/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/RECORD b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/RECORD new file mode 100644 index 0000000..db8f8df --- /dev/null +++ b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/RECORD @@ -0,0 +1,16 @@ +MarkupSafe-1.1.1.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4 +MarkupSafe-1.1.1.dist-info/LICENSE.rst,sha256=SJqOEQhQntmKN7uYPhHg9-HTHwvY-Zp5yESOf_N9B-o,1475 +MarkupSafe-1.1.1.dist-info/METADATA,sha256=nJHwJ4_4ka-V39QH883jPrslj6inNdyyNASBXbYgHXQ,3570 +MarkupSafe-1.1.1.dist-info/RECORD,, +MarkupSafe-1.1.1.dist-info/WHEEL,sha256=LukkRg4Nyu7ElUUdIG66wCYZvtuCKTu3PkyFPJmB8vI,109 +MarkupSafe-1.1.1.dist-info/top_level.txt,sha256=qy0Plje5IJuvsCBjejJyhDCjEAdcDLK_2agVcex8Z6U,11 +markupsafe/__init__.py,sha256=oTblO5f9KFM-pvnq9bB0HgElnqkJyqHnFN1Nx2NIvnY,10126 +markupsafe/__pycache__/__init__.cpython-37.pyc,, +markupsafe/__pycache__/_compat.cpython-37.pyc,, +markupsafe/__pycache__/_constants.cpython-37.pyc,, +markupsafe/__pycache__/_native.cpython-37.pyc,, +markupsafe/_compat.py,sha256=uEW1ybxEjfxIiuTbRRaJpHsPFf4yQUMMKaPgYEC5XbU,558 +markupsafe/_constants.py,sha256=zo2ajfScG-l1Sb_52EP3MlDCqO7Y1BVHUXXKRsVDRNk,4690 +markupsafe/_native.py,sha256=d-8S_zzYt2y512xYcuSxq0NeG2DUUvG80wVdTn-4KI8,1873 +markupsafe/_speedups.c,sha256=k0fzEIK3CP6MmMqeY0ob43TP90mVN0DTyn7BAl3RqSg,9884 +markupsafe/_speedups.cpython-37m-darwin.so,sha256=jdynRZDihetj62NEG_WZnKxdH6WbyPqDnGhK51xWgW0,35080 diff --git a/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/WHEEL b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/WHEEL new file mode 100644 index 0000000..22c0e9a --- /dev/null +++ b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/WHEEL @@ -0,0 +1,5 @@ +Wheel-Version: 1.0 +Generator: bdist_wheel (0.33.1) +Root-Is-Purelib: false +Tag: cp37-cp37m-macosx_10_6_intel + diff --git a/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/top_level.txt b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/top_level.txt new file mode 100644 index 0000000..75bf729 --- /dev/null +++ b/venv/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info/top_level.txt @@ -0,0 +1 @@ +markupsafe diff --git a/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/INSTALLER b/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/INSTALLER new file mode 100644 index 0000000..a1b589e --- /dev/null +++ b/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/INSTALLER @@ -0,0 +1 @@ +pip diff --git a/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/LICENSE.rst b/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/LICENSE.rst new file mode 100644 index 0000000..c37cae4 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/LICENSE.rst @@ -0,0 +1,28 @@ +Copyright 2007 Pallets + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + +1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + +2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + +3. Neither the name of the copyright holder nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED +TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/METADATA b/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/METADATA new file mode 100644 index 0000000..ae87c92 --- /dev/null +++ b/venv/lib/python3.7/site-packages/Werkzeug-0.15.4.dist-info/METADATA @@ -0,0 +1,133 @@ +Metadata-Version: 2.1 +Name: Werkzeug +Version: 0.15.4 +Summary: The comprehensive WSGI web application library. +Home-page: https://palletsprojects.com/p/werkzeug/ +Author: Armin Ronacher +Author-email: armin.ronacher@active-4.com +Maintainer: The Pallets Team +Maintainer-email: contact@palletsprojects.com +License: BSD-3-Clause +Project-URL: Documentation, https://werkzeug.palletsprojects.com/ +Project-URL: Code, https://github.com/pallets/werkzeug +Project-URL: Issue tracker, https://github.com/pallets/werkzeug/issues +Platform: UNKNOWN +Classifier: Development Status :: 5 - Production/Stable +Classifier: Environment :: Web Environment +Classifier: Intended Audience :: Developers +Classifier: License :: OSI Approved :: BSD License +Classifier: Operating System :: OS Independent +Classifier: Programming Language :: Python +Classifier: Programming Language :: Python :: 2 +Classifier: Programming Language :: Python :: 2.7 +Classifier: Programming Language :: Python :: 3 +Classifier: Programming Language :: Python :: 3.4 +Classifier: Programming Language :: Python :: 3.5 +Classifier: Programming Language :: Python :: 3.6 +Classifier: Programming Language :: Python :: 3.7 +Classifier: Programming Language :: Python :: Implementation :: CPython +Classifier: Programming Language :: Python :: Implementation :: PyPy +Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content +Classifier: Topic :: Internet :: WWW/HTTP :: WSGI +Classifier: Topic :: Internet :: WWW/HTTP :: WSGI :: Application +Classifier: Topic :: Internet :: WWW/HTTP :: WSGI :: Middleware +Classifier: Topic :: Software Development :: Libraries :: Application Frameworks +Classifier: Topic :: Software Development :: Libraries :: Python Modules +Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.* +Provides-Extra: dev +Requires-Dist: pytest ; extra == 'dev' +Requires-Dist: coverage ; extra == 'dev' +Requires-Dist: tox ; extra == 'dev' +Requires-Dist: sphinx ; extra == 'dev' +Requires-Dist: pallets-sphinx-themes ; extra == 'dev' +Requires-Dist: sphinx-issues ; extra == 'dev' +Provides-Extra: termcolor +Requires-Dist: termcolor ; extra == 'termcolor' +Provides-Extra: watchdog +Requires-Dist: watchdog ; extra == 'watchdog' + +Werkzeug +======== + +*werkzeug* German noun: "tool". Etymology: *werk* ("work"), *zeug* ("stuff") + +Werkzeug is a comprehensive `WSGI`_ web application library. It began as +a simple collection of various utilities for WSGI applications and has +become one of the most advanced WSGI utility libraries. + +It includes: + +- An interactive debugger that allows inspecting stack traces and + source code in the browser with an interactive interpreter for any + frame in the stack. +- A full-featured request object with objects to interact with + headers, query args, form data, files, and cookies. +- A response object that can wrap other WSGI applications and handle + streaming data. +- A routing system for matching URLs to endpoints and generating URLs + for endpoints, with an extensible system for capturing variables + from URLs. +- HTTP utilities to handle entity tags, cache control, dates, user + agents, cookies, files, and more. +- A threaded WSGI server for use while developing applications + locally. +- A test client for simulating HTTP requests during testing without + requiring running a server. + +Werkzeug is Unicode aware and doesn't enforce any dependencies. It is up +to the developer to choose a template engine, database adapter, and even +how to handle requests. It can be used to build all sorts of end user +applications such as blogs, wikis, or bulletin boards. + +`Flask`_ wraps Werkzeug, using it to handle the details of WSGI while +providing more structure and patterns for defining powerful +applications. + + +Installing +---------- + +Install and update using `pip`_: + +.. code-block:: text + + pip install -U Werkzeug + + +A Simple Example +---------------- + +.. code-block:: python + + from werkzeug.wrappers import Request, Response + + @Request.application + def application(request): + return Response('Hello, World!') + + if __name__ == '__main__': + from werkzeug.serving import run_simple + run_simple('localhost', 4000, application) + + +Links +----- + +- Website: https://www.palletsprojects.com/p/werkzeug/ +- Documentation: https://werkzeug.palletsprojects.com/ +- Releases: https://pypi.org/project/Werkzeug/ +- Code: https://github.com/pallets/werkzeug +- Issue tracker: https://github.com/pallets/werkzeug/issues +- Test status: + + - 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a/venv/lib/python3.7/site-packages/__pycache__/easy_install.cpython-37.pyc b/venv/lib/python3.7/site-packages/__pycache__/easy_install.cpython-37.pyc new file mode 100644 index 0000000..ec1822c Binary files /dev/null and b/venv/lib/python3.7/site-packages/__pycache__/easy_install.cpython-37.pyc differ diff --git a/venv/lib/python3.7/site-packages/__pycache__/mccabe.cpython-37.pyc b/venv/lib/python3.7/site-packages/__pycache__/mccabe.cpython-37.pyc new file mode 100644 index 0000000..be381da Binary files /dev/null and b/venv/lib/python3.7/site-packages/__pycache__/mccabe.cpython-37.pyc differ diff --git a/venv/lib/python3.7/site-packages/__pycache__/six.cpython-37.pyc b/venv/lib/python3.7/site-packages/__pycache__/six.cpython-37.pyc new file mode 100644 index 0000000..f6e37b9 Binary files /dev/null and b/venv/lib/python3.7/site-packages/__pycache__/six.cpython-37.pyc differ diff --git a/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/COPYING b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/COPYING new file mode 100644 index 0000000..d511905 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/COPYING @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James + Random Hacker. + + , 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! + + diff --git a/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/INSTALLER b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/INSTALLER new file mode 100644 index 0000000..a1b589e --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/INSTALLER @@ -0,0 +1 @@ +pip diff --git a/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/METADATA b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/METADATA new file mode 100644 index 0000000..8df5eec --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/METADATA @@ -0,0 +1,102 @@ +Metadata-Version: 2.1 +Name: astroid +Version: 2.2.5 +Summary: An abstract syntax tree for Python with inference support. +Home-page: https://github.com/PyCQA/astroid +Author: Python Code Quality Authority +Author-email: code-quality@python.org +License: LGPL +Platform: UNKNOWN +Classifier: Topic :: Software Development :: Libraries :: Python Modules +Classifier: Topic :: Software Development :: Quality Assurance +Classifier: Programming Language :: Python +Classifier: Programming Language :: Python :: 3 +Classifier: Programming Language :: Python :: 3.4 +Classifier: Programming Language :: Python :: 3.5 +Classifier: Programming Language :: Python :: 3.6 +Classifier: Programming Language :: Python :: 3.7 +Classifier: Programming Language :: Python :: Implementation :: CPython +Classifier: Programming Language :: Python :: Implementation :: PyPy +Requires-Python: >=3.4.* +Requires-Dist: lazy-object-proxy +Requires-Dist: six +Requires-Dist: wrapt +Requires-Dist: typed-ast (>=1.3.0) ; implementation_name == "cpython" +Requires-Dist: typing ; python_version < "3.5" + +Astroid +======= + +.. image:: https://travis-ci.org/PyCQA/astroid.svg?branch=master + :target: https://travis-ci.org/PyCQA/astroid + +.. image:: https://ci.appveyor.com/api/projects/status/co3u42kunguhbh6l/branch/master?svg=true + :alt: AppVeyor Build Status + :target: https://ci.appveyor.com/project/PCManticore/astroid + +.. image:: https://coveralls.io/repos/github/PyCQA/astroid/badge.svg?branch=master + :target: https://coveralls.io/github/PyCQA/astroid?branch=master + +.. image:: https://readthedocs.org/projects/astroid/badge/?version=latest + :target: http://astroid.readthedocs.io/en/latest/?badge=latest + :alt: Documentation Status + +.. image:: https://img.shields.io/badge/code%20style-black-000000.svg + :target: https://github.com/ambv/black + + + +What's this? +------------ + +The aim of this module is to provide a common base representation of +python source code. It is currently the library powering pylint's capabilities. + +It provides a compatible representation which comes from the `_ast` +module. It rebuilds the tree generated by the builtin _ast module by +recursively walking down the AST and building an extended ast. The new +node classes have additional methods and attributes for different +usages. They include some support for static inference and local name +scopes. Furthermore, astroid can also build partial trees by inspecting living +objects. + + +Installation +------------ + +Extract the tarball, jump into the created directory and run:: + + pip install . + + +If you want to do an editable installation, you can run:: + + pip install -e . + + +If you have any questions, please mail the code-quality@python.org +mailing list for support. See +http://mail.python.org/mailman/listinfo/code-quality for subscription +information and archives. + +Documentation +------------- +http://astroid.readthedocs.io/en/latest/ + + +Python Versions +--------------- + +astroid 2.0 is currently available for Python 3 only. If you want Python 2 +support, older versions of astroid will still supported until 2020. + +Test +---- + +Tests are in the 'test' subdirectory. To launch the whole tests suite, you can use +either `tox` or `pytest`:: + + tox + pytest astroid + + diff --git a/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/RECORD b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/RECORD new file mode 100644 index 0000000..4976de5 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/RECORD @@ -0,0 +1,125 @@ +astroid-2.2.5.dist-info/COPYING,sha256=qxX9UmvY3Rip5368E5ZWv00z6X_HI4zRG_YOK5uGZsY,17987 +astroid-2.2.5.dist-info/COPYING.LESSER,sha256=qb3eVhbs3R6YC0TzYGAO6Hg7H5m4zIOivrFjoKOQ6GE,26527 +astroid-2.2.5.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4 +astroid-2.2.5.dist-info/METADATA,sha256=_0Eu_wSg7s0nPtqYiIZZYG7Owax3vxAcNUDiBrCfYho,3213 +astroid-2.2.5.dist-info/RECORD,, +astroid-2.2.5.dist-info/WHEEL,sha256=U88EhGIw8Sj2_phqajeu_EAi3RAo8-C6zV3REsWbWbs,92 +astroid-2.2.5.dist-info/top_level.txt,sha256=HsdW4O2x7ZXRj6k-agi3RaQybGLobI3VSE-jt4vQUXM,8 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b/venv/lib/python3.7/site-packages/astroid-2.2.5.dist-info/top_level.txt @@ -0,0 +1 @@ +astroid diff --git a/venv/lib/python3.7/site-packages/astroid/__init__.py b/venv/lib/python3.7/site-packages/astroid/__init__.py new file mode 100644 index 0000000..d36a5b4 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/__init__.py @@ -0,0 +1,166 @@ +# Copyright (c) 2006-2013, 2015 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2016 Moises Lopez +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Python Abstract Syntax Tree New Generation + +The aim of this module is to provide a common base representation of +python source code for projects such as pychecker, pyreverse, +pylint... Well, actually the development of this library is essentially +governed by pylint's needs. + +It extends class defined in the python's _ast module with some +additional methods and attributes. Instance attributes are added by a +builder object, which can either generate extended ast (let's call +them astroid ;) by visiting an existent ast tree or by inspecting living +object. Methods are added by monkey patching ast classes. + +Main modules are: + +* nodes and scoped_nodes for more information about methods and + attributes added to different node classes + +* the manager contains a high level object to get astroid trees from + source files and living objects. It maintains a cache of previously + constructed tree for quick access + +* builder contains the class responsible to build astroid trees +""" + +import enum +import itertools +import os +import sys + +import wrapt + + +_Context = enum.Enum("Context", "Load Store Del") +Load = _Context.Load +Store = _Context.Store +Del = _Context.Del +del _Context + + +from .__pkginfo__ import version as __version__ + +# WARNING: internal imports order matters ! + +# pylint: disable=redefined-builtin + +# make all exception classes accessible from astroid package +from astroid.exceptions import * + +# make all node classes accessible from astroid package +from astroid.nodes import * + +# trigger extra monkey-patching +from astroid import inference + +# more stuff available +from astroid import raw_building +from astroid.bases import BaseInstance, Instance, BoundMethod, UnboundMethod +from astroid.node_classes import are_exclusive, unpack_infer +from astroid.scoped_nodes import builtin_lookup +from astroid.builder import parse, extract_node +from astroid.util import Uninferable + +# make a manager instance (borg) accessible from astroid package +from astroid.manager import AstroidManager + +MANAGER = AstroidManager() +del AstroidManager + +# transform utilities (filters and decorator) + + +# pylint: disable=dangerous-default-value +@wrapt.decorator +def _inference_tip_cached(func, instance, args, kwargs, _cache={}): + """Cache decorator used for inference tips""" + node = args[0] + try: + return iter(_cache[func, node]) + except KeyError: + result = func(*args, **kwargs) + # Need to keep an iterator around + original, copy = itertools.tee(result) + _cache[func, node] = list(copy) + return original + + +# pylint: enable=dangerous-default-value + + +def inference_tip(infer_function, raise_on_overwrite=False): + """Given an instance specific inference function, return a function to be + given to MANAGER.register_transform to set this inference function. + + :param bool raise_on_overwrite: Raise an `InferenceOverwriteError` + if the inference tip will overwrite another. Used for debugging + + Typical usage + + .. sourcecode:: python + + MANAGER.register_transform(Call, inference_tip(infer_named_tuple), + predicate) + + .. Note:: + + Using an inference tip will override + any previously set inference tip for the given + node. Use a predicate in the transform to prevent + excess overwrites. + """ + + def transform(node, infer_function=infer_function): + if ( + raise_on_overwrite + and node._explicit_inference is not None + and node._explicit_inference is not infer_function + ): + raise InferenceOverwriteError( + "Inference already set to {existing_inference}. " + "Trying to overwrite with {new_inference} for {node}".format( + existing_inference=infer_function, + new_inference=node._explicit_inference, + node=node, + ) + ) + # pylint: disable=no-value-for-parameter + node._explicit_inference = _inference_tip_cached(infer_function) + return node + + return transform + + +def register_module_extender(manager, module_name, get_extension_mod): + def transform(node): + extension_module = get_extension_mod() + for name, objs in extension_module.locals.items(): + node.locals[name] = objs + for obj in objs: + if obj.parent is extension_module: + obj.parent = node + + manager.register_transform(Module, transform, lambda n: n.name == module_name) + + +# load brain plugins +BRAIN_MODULES_DIR = os.path.join(os.path.dirname(__file__), "brain") +if BRAIN_MODULES_DIR not in sys.path: + # add it to the end of the list so user path take precedence + sys.path.append(BRAIN_MODULES_DIR) +# load modules in this directory +for module in os.listdir(BRAIN_MODULES_DIR): + if module.endswith(".py"): + __import__(module[:-3]) diff --git a/venv/lib/python3.7/site-packages/astroid/__pkginfo__.py b/venv/lib/python3.7/site-packages/astroid/__pkginfo__.py new file mode 100644 index 0000000..a1f58a8 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/__pkginfo__.py @@ -0,0 +1,57 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2006-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2015-2017 Ceridwen +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2015 Radosław Ganczarek +# Copyright (c) 2016 Moises Lopez +# Copyright (c) 2017 Hugo +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2017 Calen Pennington +# Copyright (c) 2018 Ashley Whetter +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""astroid packaging information""" + +distname = "astroid" + +modname = "astroid" + +version = "2.2.5" +numversion = tuple(int(elem) for elem in version.split(".") if elem.isdigit()) + +extras_require = {} +install_requires = [ + "lazy_object_proxy", + "six", + "wrapt", + 'typing;python_version<"3.5"', + 'typed-ast>=1.3.0;implementation_name== "cpython"', +] + +# pylint: disable=redefined-builtin; why license is a builtin anyway? +license = "LGPL" + +author = "Python Code Quality Authority" +author_email = "code-quality@python.org" +mailinglist = "mailto://%s" % author_email +web = "https://github.com/PyCQA/astroid" + +description = "An abstract syntax tree for Python with inference support." + +classifiers = [ + "Topic :: Software Development :: Libraries :: Python Modules", + "Topic :: Software Development :: Quality Assurance", + "Programming Language :: Python", + "Programming Language :: Python :: 3", + "Programming Language :: Python :: 3.4", + "Programming Language :: Python :: 3.5", + "Programming Language :: Python :: 3.6", + "Programming Language :: Python :: 3.7", + "Programming Language :: Python :: Implementation :: CPython", + "Programming Language :: Python :: Implementation :: PyPy", +] diff --git a/venv/lib/python3.7/site-packages/astroid/__pycache__/__init__.cpython-37.pyc b/venv/lib/python3.7/site-packages/astroid/__pycache__/__init__.cpython-37.pyc new file mode 100644 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b/venv/lib/python3.7/site-packages/astroid/__pycache__/util.cpython-37.pyc differ diff --git a/venv/lib/python3.7/site-packages/astroid/_ast.py b/venv/lib/python3.7/site-packages/astroid/_ast.py new file mode 100644 index 0000000..da95f1d --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/_ast.py @@ -0,0 +1,40 @@ +import ast +from collections import namedtuple +from functools import partial +from typing import Optional +import sys + +_ast_py2 = _ast_py3 = None +try: + import typed_ast.ast3 as _ast_py3 + import typed_ast.ast27 as _ast_py2 +except ImportError: + pass + + +FunctionType = namedtuple("FunctionType", ["argtypes", "returns"]) + + +def _get_parser_module(parse_python_two: bool = False): + if parse_python_two: + parser_module = _ast_py2 + else: + parser_module = _ast_py3 + return parser_module or ast + + +def _parse(string: str, parse_python_two: bool = False): + parse_module = _get_parser_module(parse_python_two=parse_python_two) + parse_func = parse_module.parse + if _ast_py3 and not parse_python_two: + parse_func = partial(parse_func, feature_version=sys.version_info.minor) + return parse_func(string) + + +def parse_function_type_comment(type_comment: str) -> Optional[FunctionType]: + """Given a correct type comment, obtain a FunctionType object""" + if _ast_py3 is None: + return None + + func_type = _ast_py3.parse(type_comment, "", "func_type") + return FunctionType(argtypes=func_type.argtypes, returns=func_type.returns) diff --git a/venv/lib/python3.7/site-packages/astroid/arguments.py b/venv/lib/python3.7/site-packages/astroid/arguments.py new file mode 100644 index 0000000..c4bdc6d --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/arguments.py @@ -0,0 +1,285 @@ +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 Anthony Sottile + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +from astroid import bases +from astroid import context as contextmod +from astroid import exceptions +from astroid import nodes +from astroid import util + + +class CallSite: + """Class for understanding arguments passed into a call site + + It needs a call context, which contains the arguments and the + keyword arguments that were passed into a given call site. + In order to infer what an argument represents, call + :meth:`infer_argument` with the corresponding function node + and the argument name. + """ + + def __init__(self, callcontext, argument_context_map=None): + if argument_context_map is None: + argument_context_map = {} + self.argument_context_map = argument_context_map + args = callcontext.args + keywords = callcontext.keywords + self.duplicated_keywords = set() + self._unpacked_args = self._unpack_args(args) + self._unpacked_kwargs = self._unpack_keywords(keywords) + + self.positional_arguments = [ + arg for arg in self._unpacked_args if arg is not util.Uninferable + ] + self.keyword_arguments = { + key: value + for key, value in self._unpacked_kwargs.items() + if value is not util.Uninferable + } + + @classmethod + def from_call(cls, call_node): + """Get a CallSite object from the given Call node.""" + callcontext = contextmod.CallContext(call_node.args, call_node.keywords) + return cls(callcontext) + + def has_invalid_arguments(self): + """Check if in the current CallSite were passed *invalid* arguments + + This can mean multiple things. For instance, if an unpacking + of an invalid object was passed, then this method will return True. + Other cases can be when the arguments can't be inferred by astroid, + for example, by passing objects which aren't known statically. + """ + return len(self.positional_arguments) != len(self._unpacked_args) + + def has_invalid_keywords(self): + """Check if in the current CallSite were passed *invalid* keyword arguments + + For instance, unpacking a dictionary with integer keys is invalid + (**{1:2}), because the keys must be strings, which will make this + method to return True. Other cases where this might return True if + objects which can't be inferred were passed. + """ + return len(self.keyword_arguments) != len(self._unpacked_kwargs) + + def _unpack_keywords(self, keywords): + values = {} + context = contextmod.InferenceContext() + context.extra_context = self.argument_context_map + for name, value in keywords: + if name is None: + # Then it's an unpacking operation (**) + try: + inferred = next(value.infer(context=context)) + except exceptions.InferenceError: + values[name] = util.Uninferable + continue + + if not isinstance(inferred, nodes.Dict): + # Not something we can work with. + values[name] = util.Uninferable + continue + + for dict_key, dict_value in inferred.items: + try: + dict_key = next(dict_key.infer(context=context)) + except exceptions.InferenceError: + values[name] = util.Uninferable + continue + if not isinstance(dict_key, nodes.Const): + values[name] = util.Uninferable + continue + if not isinstance(dict_key.value, str): + values[name] = util.Uninferable + continue + if dict_key.value in values: + # The name is already in the dictionary + values[dict_key.value] = util.Uninferable + self.duplicated_keywords.add(dict_key.value) + continue + values[dict_key.value] = dict_value + else: + values[name] = value + return values + + def _unpack_args(self, args): + values = [] + context = contextmod.InferenceContext() + context.extra_context = self.argument_context_map + for arg in args: + if isinstance(arg, nodes.Starred): + try: + inferred = next(arg.value.infer(context=context)) + except exceptions.InferenceError: + values.append(util.Uninferable) + continue + + if inferred is util.Uninferable: + values.append(util.Uninferable) + continue + if not hasattr(inferred, "elts"): + values.append(util.Uninferable) + continue + values.extend(inferred.elts) + else: + values.append(arg) + return values + + def infer_argument(self, funcnode, name, context): + """infer a function argument value according to the call context + + Arguments: + funcnode: The function being called. + name: The name of the argument whose value is being inferred. + context: Inference context object + """ + if name in self.duplicated_keywords: + raise exceptions.InferenceError( + "The arguments passed to {func!r} " " have duplicate keywords.", + call_site=self, + func=funcnode, + arg=name, + context=context, + ) + + # Look into the keywords first, maybe it's already there. + try: + return self.keyword_arguments[name].infer(context) + except KeyError: + pass + + # Too many arguments given and no variable arguments. + if len(self.positional_arguments) > len(funcnode.args.args): + if not funcnode.args.vararg: + raise exceptions.InferenceError( + "Too many positional arguments " + "passed to {func!r} that does " + "not have *args.", + call_site=self, + func=funcnode, + arg=name, + context=context, + ) + + positional = self.positional_arguments[: len(funcnode.args.args)] + vararg = self.positional_arguments[len(funcnode.args.args) :] + argindex = funcnode.args.find_argname(name)[0] + kwonlyargs = {arg.name for arg in funcnode.args.kwonlyargs} + kwargs = { + key: value + for key, value in self.keyword_arguments.items() + if key not in kwonlyargs + } + # If there are too few positionals compared to + # what the function expects to receive, check to see + # if the missing positional arguments were passed + # as keyword arguments and if so, place them into the + # positional args list. + if len(positional) < len(funcnode.args.args): + for func_arg in funcnode.args.args: + if func_arg.name in kwargs: + arg = kwargs.pop(func_arg.name) + positional.append(arg) + + if argindex is not None: + # 2. first argument of instance/class method + if argindex == 0 and funcnode.type in ("method", "classmethod"): + if context.boundnode is not None: + boundnode = context.boundnode + else: + # XXX can do better ? + boundnode = funcnode.parent.frame() + + if isinstance(boundnode, nodes.ClassDef): + # Verify that we're accessing a method + # of the metaclass through a class, as in + # `cls.metaclass_method`. In this case, the + # first argument is always the class. + method_scope = funcnode.parent.scope() + if method_scope is boundnode.metaclass(): + return iter((boundnode,)) + + if funcnode.type == "method": + if not isinstance(boundnode, bases.Instance): + boundnode = bases.Instance(boundnode) + return iter((boundnode,)) + if funcnode.type == "classmethod": + return iter((boundnode,)) + # if we have a method, extract one position + # from the index, so we'll take in account + # the extra parameter represented by `self` or `cls` + if funcnode.type in ("method", "classmethod"): + argindex -= 1 + # 2. search arg index + try: + return self.positional_arguments[argindex].infer(context) + except IndexError: + pass + + if funcnode.args.kwarg == name: + # It wants all the keywords that were passed into + # the call site. + if self.has_invalid_keywords(): + raise exceptions.InferenceError( + "Inference failed to find values for all keyword arguments " + "to {func!r}: {unpacked_kwargs!r} doesn't correspond to " + "{keyword_arguments!r}.", + keyword_arguments=self.keyword_arguments, + unpacked_kwargs=self._unpacked_kwargs, + call_site=self, + func=funcnode, + arg=name, + context=context, + ) + kwarg = nodes.Dict( + lineno=funcnode.args.lineno, + col_offset=funcnode.args.col_offset, + parent=funcnode.args, + ) + kwarg.postinit( + [(nodes.const_factory(key), value) for key, value in kwargs.items()] + ) + return iter((kwarg,)) + if funcnode.args.vararg == name: + # It wants all the args that were passed into + # the call site. + if self.has_invalid_arguments(): + raise exceptions.InferenceError( + "Inference failed to find values for all positional " + "arguments to {func!r}: {unpacked_args!r} doesn't " + "correspond to {positional_arguments!r}.", + positional_arguments=self.positional_arguments, + unpacked_args=self._unpacked_args, + call_site=self, + func=funcnode, + arg=name, + context=context, + ) + args = nodes.Tuple( + lineno=funcnode.args.lineno, + col_offset=funcnode.args.col_offset, + parent=funcnode.args, + ) + args.postinit(vararg) + return iter((args,)) + + # Check if it's a default parameter. + try: + return funcnode.args.default_value(name).infer(context) + except exceptions.NoDefault: + pass + raise exceptions.InferenceError( + "No value found for argument {name} to " "{func!r}", + call_site=self, + func=funcnode, + arg=name, + context=context, + ) diff --git a/venv/lib/python3.7/site-packages/astroid/as_string.py b/venv/lib/python3.7/site-packages/astroid/as_string.py new file mode 100644 index 0000000..7042272 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/as_string.py @@ -0,0 +1,630 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2009-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2010 Daniel Harding +# Copyright (c) 2013-2016, 2018 Claudiu Popa +# Copyright (c) 2013-2014 Google, Inc. +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016 Jared Garst +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2017 rr- +# Copyright (c) 2018 brendanator +# Copyright (c) 2018 Nick Drozd + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""This module renders Astroid nodes as string: + +* :func:`to_code` function return equivalent (hopefully valid) python string + +* :func:`dump` function return an internal representation of nodes found + in the tree, useful for debugging or understanding the tree structure +""" +import sys + + +# pylint: disable=unused-argument + +DOC_NEWLINE = "\0" + + +class AsStringVisitor: + """Visitor to render an Astroid node as a valid python code string""" + + def __init__(self, indent): + self.indent = indent + + def __call__(self, node): + """Makes this visitor behave as a simple function""" + return node.accept(self).replace(DOC_NEWLINE, "\n") + + def _docs_dedent(self, doc): + """Stop newlines in docs being indented by self._stmt_list""" + return '\n%s"""%s"""' % (self.indent, doc.replace("\n", DOC_NEWLINE)) + + def _stmt_list(self, stmts, indent=True): + """return a list of nodes to string""" + stmts = "\n".join(nstr for nstr in [n.accept(self) for n in stmts] if nstr) + if indent: + return self.indent + stmts.replace("\n", "\n" + self.indent) + + return stmts + + def _precedence_parens(self, node, child, is_left=True): + """Wrap child in parens only if required to keep same semantics""" + if self._should_wrap(node, child, is_left): + return "(%s)" % child.accept(self) + + return child.accept(self) + + def _should_wrap(self, node, child, is_left): + """Wrap child if: + - it has lower precedence + - same precedence with position opposite to associativity direction + """ + node_precedence = node.op_precedence() + child_precedence = child.op_precedence() + + if node_precedence > child_precedence: + # 3 * (4 + 5) + return True + + if ( + node_precedence == child_precedence + and is_left != node.op_left_associative() + ): + # 3 - (4 - 5) + # (2**3)**4 + return True + + return False + + ## visit_ methods ########################################### + + def visit_arguments(self, node): + """return an astroid.Function node as string""" + return node.format_args() + + def visit_assignattr(self, node): + """return an astroid.AssAttr node as string""" + return self.visit_attribute(node) + + def visit_assert(self, node): + """return an astroid.Assert node as string""" + if node.fail: + return "assert %s, %s" % (node.test.accept(self), node.fail.accept(self)) + return "assert %s" % node.test.accept(self) + + def visit_assignname(self, node): + """return an astroid.AssName node as string""" + return node.name + + def visit_assign(self, node): + """return an astroid.Assign node as string""" + lhs = " = ".join(n.accept(self) for n in node.targets) + return "%s = %s" % (lhs, node.value.accept(self)) + + def visit_augassign(self, node): + """return an astroid.AugAssign node as string""" + return "%s %s %s" % (node.target.accept(self), node.op, node.value.accept(self)) + + def visit_annassign(self, node): + """Return an astroid.AugAssign node as string""" + + target = node.target.accept(self) + annotation = node.annotation.accept(self) + if node.value is None: + return "%s: %s" % (target, annotation) + return "%s: %s = %s" % (target, annotation, node.value.accept(self)) + + def visit_repr(self, node): + """return an astroid.Repr node as string""" + return "`%s`" % node.value.accept(self) + + def visit_binop(self, node): + """return an astroid.BinOp node as string""" + left = self._precedence_parens(node, node.left) + right = self._precedence_parens(node, node.right, is_left=False) + if node.op == "**": + return "%s%s%s" % (left, node.op, right) + + return "%s %s %s" % (left, node.op, right) + + def visit_boolop(self, node): + """return an astroid.BoolOp node as string""" + values = ["%s" % self._precedence_parens(node, n) for n in node.values] + return (" %s " % node.op).join(values) + + def visit_break(self, node): + """return an astroid.Break node as string""" + return "break" + + def visit_call(self, node): + """return an astroid.Call node as string""" + expr_str = self._precedence_parens(node, node.func) + args = [arg.accept(self) for arg in node.args] + if node.keywords: + keywords = [kwarg.accept(self) for kwarg in node.keywords] + else: + keywords = [] + + args.extend(keywords) + return "%s(%s)" % (expr_str, ", ".join(args)) + + def visit_classdef(self, node): + """return an astroid.ClassDef node as string""" + decorate = node.decorators.accept(self) if node.decorators else "" + bases = ", ".join(n.accept(self) for n in node.bases) + metaclass = node.metaclass() + if metaclass and not node.has_metaclass_hack(): + if bases: + bases = "(%s, metaclass=%s)" % (bases, metaclass.name) + else: + bases = "(metaclass=%s)" % metaclass.name + else: + bases = "(%s)" % bases if bases else "" + docs = self._docs_dedent(node.doc) if node.doc else "" + return "\n\n%sclass %s%s:%s\n%s\n" % ( + decorate, + node.name, + bases, + docs, + self._stmt_list(node.body), + ) + + def visit_compare(self, node): + """return an astroid.Compare node as string""" + rhs_str = " ".join( + [ + "%s %s" % (op, self._precedence_parens(node, expr, is_left=False)) + for op, expr in node.ops + ] + ) + return "%s %s" % (self._precedence_parens(node, node.left), rhs_str) + + def visit_comprehension(self, node): + """return an astroid.Comprehension node as string""" + ifs = "".join(" if %s" % n.accept(self) for n in node.ifs) + return "for %s in %s%s" % ( + node.target.accept(self), + node.iter.accept(self), + ifs, + ) + + def visit_const(self, node): + """return an astroid.Const node as string""" + if node.value is Ellipsis: + return "..." + return repr(node.value) + + def visit_continue(self, node): + """return an astroid.Continue node as string""" + return "continue" + + def visit_delete(self, node): # XXX check if correct + """return an astroid.Delete node as string""" + return "del %s" % ", ".join(child.accept(self) for child in node.targets) + + def visit_delattr(self, node): + """return an astroid.DelAttr node as string""" + return self.visit_attribute(node) + + def visit_delname(self, node): + """return an astroid.DelName node as string""" + return node.name + + def visit_decorators(self, node): + """return an astroid.Decorators node as string""" + return "@%s\n" % "\n@".join(item.accept(self) for item in node.nodes) + + def visit_dict(self, node): + """return an astroid.Dict node as string""" + return "{%s}" % ", ".join(self._visit_dict(node)) + + def _visit_dict(self, node): + for key, value in node.items: + key = key.accept(self) + value = value.accept(self) + if key == "**": + # It can only be a DictUnpack node. + yield key + value + else: + yield "%s: %s" % (key, value) + + def visit_dictunpack(self, node): + return "**" + + def visit_dictcomp(self, node): + """return an astroid.DictComp node as string""" + return "{%s: %s %s}" % ( + node.key.accept(self), + node.value.accept(self), + " ".join(n.accept(self) for n in node.generators), + ) + + def visit_expr(self, node): + """return an astroid.Discard node as string""" + return node.value.accept(self) + + def visit_emptynode(self, node): + """dummy method for visiting an Empty node""" + return "" + + def visit_excepthandler(self, node): + if node.type: + if node.name: + excs = "except %s, %s" % ( + node.type.accept(self), + node.name.accept(self), + ) + else: + excs = "except %s" % node.type.accept(self) + else: + excs = "except" + return "%s:\n%s" % (excs, self._stmt_list(node.body)) + + def visit_ellipsis(self, node): + """return an astroid.Ellipsis node as string""" + return "..." + + def visit_empty(self, node): + """return an Empty node as string""" + return "" + + def visit_exec(self, node): + """return an astroid.Exec node as string""" + if node.locals: + return "exec %s in %s, %s" % ( + node.expr.accept(self), + node.locals.accept(self), + node.globals.accept(self), + ) + if node.globals: + return "exec %s in %s" % (node.expr.accept(self), node.globals.accept(self)) + return "exec %s" % node.expr.accept(self) + + def visit_extslice(self, node): + """return an astroid.ExtSlice node as string""" + return ", ".join(dim.accept(self) for dim in node.dims) + + def visit_for(self, node): + """return an astroid.For node as string""" + fors = "for %s in %s:\n%s" % ( + node.target.accept(self), + node.iter.accept(self), + self._stmt_list(node.body), + ) + if node.orelse: + fors = "%s\nelse:\n%s" % (fors, self._stmt_list(node.orelse)) + return fors + + def visit_importfrom(self, node): + """return an astroid.ImportFrom node as string""" + return "from %s import %s" % ( + "." * (node.level or 0) + node.modname, + _import_string(node.names), + ) + + def visit_functiondef(self, node): + """return an astroid.Function node as string""" + decorate = node.decorators.accept(self) if node.decorators else "" + docs = self._docs_dedent(node.doc) if node.doc else "" + trailer = ":" + if node.returns: + return_annotation = "->" + node.returns.as_string() + trailer = return_annotation + ":" + def_format = "\n%sdef %s(%s)%s%s\n%s" + return def_format % ( + decorate, + node.name, + node.args.accept(self), + trailer, + docs, + self._stmt_list(node.body), + ) + + def visit_generatorexp(self, node): + """return an astroid.GeneratorExp node as string""" + return "(%s %s)" % ( + node.elt.accept(self), + " ".join(n.accept(self) for n in node.generators), + ) + + def visit_attribute(self, node): + """return an astroid.Getattr node as string""" + return "%s.%s" % (self._precedence_parens(node, node.expr), node.attrname) + + def visit_global(self, node): + """return an astroid.Global node as string""" + return "global %s" % ", ".join(node.names) + + def visit_if(self, node): + """return an astroid.If node as string""" + ifs = ["if %s:\n%s" % (node.test.accept(self), self._stmt_list(node.body))] + if node.has_elif_block(): + ifs.append("el%s" % self._stmt_list(node.orelse, indent=False)) + elif node.orelse: + ifs.append("else:\n%s" % self._stmt_list(node.orelse)) + return "\n".join(ifs) + + def visit_ifexp(self, node): + """return an astroid.IfExp node as string""" + return "%s if %s else %s" % ( + self._precedence_parens(node, node.body, is_left=True), + self._precedence_parens(node, node.test, is_left=True), + self._precedence_parens(node, node.orelse, is_left=False), + ) + + def visit_import(self, node): + """return an astroid.Import node as string""" + return "import %s" % _import_string(node.names) + + def visit_keyword(self, node): + """return an astroid.Keyword node as string""" + if node.arg is None: + return "**%s" % node.value.accept(self) + return "%s=%s" % (node.arg, node.value.accept(self)) + + def visit_lambda(self, node): + """return an astroid.Lambda node as string""" + args = node.args.accept(self) + body = node.body.accept(self) + if args: + return "lambda %s: %s" % (args, body) + + return "lambda: %s" % body + + def visit_list(self, node): + """return an astroid.List node as string""" + return "[%s]" % ", ".join(child.accept(self) for child in node.elts) + + def visit_listcomp(self, node): + """return an astroid.ListComp node as string""" + return "[%s %s]" % ( + node.elt.accept(self), + " ".join(n.accept(self) for n in node.generators), + ) + + def visit_module(self, node): + """return an astroid.Module node as string""" + docs = '"""%s"""\n\n' % node.doc if node.doc else "" + return docs + "\n".join(n.accept(self) for n in node.body) + "\n\n" + + def visit_name(self, node): + """return an astroid.Name node as string""" + return node.name + + def visit_pass(self, node): + """return an astroid.Pass node as string""" + return "pass" + + def visit_print(self, node): + """return an astroid.Print node as string""" + nodes = ", ".join(n.accept(self) for n in node.values) + if not node.nl: + nodes = "%s," % nodes + if node.dest: + return "print >> %s, %s" % (node.dest.accept(self), nodes) + return "print %s" % nodes + + def visit_raise(self, node): + """return an astroid.Raise node as string""" + if node.exc: + if node.inst: + if node.tback: + return "raise %s, %s, %s" % ( + node.exc.accept(self), + node.inst.accept(self), + node.tback.accept(self), + ) + return "raise %s, %s" % (node.exc.accept(self), node.inst.accept(self)) + return "raise %s" % node.exc.accept(self) + return "raise" + + def visit_return(self, node): + """return an astroid.Return node as string""" + if node.is_tuple_return() and len(node.value.elts) > 1: + elts = [child.accept(self) for child in node.value.elts] + return "return %s" % ", ".join(elts) + + if node.value: + return "return %s" % node.value.accept(self) + + return "return" + + def visit_index(self, node): + """return an astroid.Index node as string""" + return node.value.accept(self) + + def visit_set(self, node): + """return an astroid.Set node as string""" + return "{%s}" % ", ".join(child.accept(self) for child in node.elts) + + def visit_setcomp(self, node): + """return an astroid.SetComp node as string""" + return "{%s %s}" % ( + node.elt.accept(self), + " ".join(n.accept(self) for n in node.generators), + ) + + def visit_slice(self, node): + """return an astroid.Slice node as string""" + lower = node.lower.accept(self) if node.lower else "" + upper = node.upper.accept(self) if node.upper else "" + step = node.step.accept(self) if node.step else "" + if step: + return "%s:%s:%s" % (lower, upper, step) + return "%s:%s" % (lower, upper) + + def visit_subscript(self, node): + """return an astroid.Subscript node as string""" + idx = node.slice + if idx.__class__.__name__.lower() == "index": + idx = idx.value + idxstr = idx.accept(self) + if idx.__class__.__name__.lower() == "tuple" and idx.elts: + # Remove parenthesis in tuple and extended slice. + # a[(::1, 1:)] is not valid syntax. + idxstr = idxstr[1:-1] + return "%s[%s]" % (self._precedence_parens(node, node.value), idxstr) + + def visit_tryexcept(self, node): + """return an astroid.TryExcept node as string""" + trys = ["try:\n%s" % self._stmt_list(node.body)] + for handler in node.handlers: + trys.append(handler.accept(self)) + if node.orelse: + trys.append("else:\n%s" % self._stmt_list(node.orelse)) + return "\n".join(trys) + + def visit_tryfinally(self, node): + """return an astroid.TryFinally node as string""" + return "try:\n%s\nfinally:\n%s" % ( + self._stmt_list(node.body), + self._stmt_list(node.finalbody), + ) + + def visit_tuple(self, node): + """return an astroid.Tuple node as string""" + if len(node.elts) == 1: + return "(%s, )" % node.elts[0].accept(self) + return "(%s)" % ", ".join(child.accept(self) for child in node.elts) + + def visit_unaryop(self, node): + """return an astroid.UnaryOp node as string""" + if node.op == "not": + operator = "not " + else: + operator = node.op + return "%s%s" % (operator, self._precedence_parens(node, node.operand)) + + def visit_while(self, node): + """return an astroid.While node as string""" + whiles = "while %s:\n%s" % (node.test.accept(self), self._stmt_list(node.body)) + if node.orelse: + whiles = "%s\nelse:\n%s" % (whiles, self._stmt_list(node.orelse)) + return whiles + + def visit_with(self, node): # 'with' without 'as' is possible + """return an astroid.With node as string""" + items = ", ".join( + ("%s" % expr.accept(self)) + (vars and " as %s" % (vars.accept(self)) or "") + for expr, vars in node.items + ) + return "with %s:\n%s" % (items, self._stmt_list(node.body)) + + def visit_yield(self, node): + """yield an ast.Yield node as string""" + yi_val = (" " + node.value.accept(self)) if node.value else "" + expr = "yield" + yi_val + if node.parent.is_statement: + return expr + + return "(%s)" % (expr,) + + def visit_starred(self, node): + """return Starred node as string""" + return "*" + node.value.accept(self) + + # These aren't for real AST nodes, but for inference objects. + + def visit_frozenset(self, node): + return node.parent.accept(self) + + def visit_super(self, node): + return node.parent.accept(self) + + def visit_uninferable(self, node): + return str(node) + + +class AsStringVisitor3(AsStringVisitor): + """AsStringVisitor3 overwrites some AsStringVisitor methods""" + + def visit_excepthandler(self, node): + if node.type: + if node.name: + excs = "except %s as %s" % ( + node.type.accept(self), + node.name.accept(self), + ) + else: + excs = "except %s" % node.type.accept(self) + else: + excs = "except" + return "%s:\n%s" % (excs, self._stmt_list(node.body)) + + def visit_nonlocal(self, node): + """return an astroid.Nonlocal node as string""" + return "nonlocal %s" % ", ".join(node.names) + + def visit_raise(self, node): + """return an astroid.Raise node as string""" + if node.exc: + if node.cause: + return "raise %s from %s" % ( + node.exc.accept(self), + node.cause.accept(self), + ) + return "raise %s" % node.exc.accept(self) + return "raise" + + def visit_yieldfrom(self, node): + """ Return an astroid.YieldFrom node as string. """ + yi_val = (" " + node.value.accept(self)) if node.value else "" + expr = "yield from" + yi_val + if node.parent.is_statement: + return expr + + return "(%s)" % (expr,) + + def visit_asyncfunctiondef(self, node): + function = super(AsStringVisitor3, self).visit_functiondef(node) + return "async " + function.strip() + + def visit_await(self, node): + return "await %s" % node.value.accept(self) + + def visit_asyncwith(self, node): + return "async %s" % self.visit_with(node) + + def visit_asyncfor(self, node): + return "async %s" % self.visit_for(node) + + def visit_joinedstr(self, node): + # Special treatment for constants, + # as we want to join literals not reprs + string = "".join( + value.value if type(value).__name__ == "Const" else value.accept(self) + for value in node.values + ) + return "f'%s'" % string + + def visit_formattedvalue(self, node): + return "{%s}" % node.value.accept(self) + + def visit_comprehension(self, node): + """return an astroid.Comprehension node as string""" + return "%s%s" % ( + "async " if node.is_async else "", + super(AsStringVisitor3, self).visit_comprehension(node), + ) + + +def _import_string(names): + """return a list of (name, asname) formatted as a string""" + _names = [] + for name, asname in names: + if asname is not None: + _names.append("%s as %s" % (name, asname)) + else: + _names.append(name) + return ", ".join(_names) + + +if sys.version_info >= (3, 0): + AsStringVisitor = AsStringVisitor3 + +# This sets the default indent to 4 spaces. +to_code = AsStringVisitor(" ") diff --git a/venv/lib/python3.7/site-packages/astroid/bases.py b/venv/lib/python3.7/site-packages/astroid/bases.py new file mode 100644 index 0000000..8fbbebf --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/bases.py @@ -0,0 +1,547 @@ +# Copyright (c) 2009-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2012 FELD Boris +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2016-2017 Derek Gustafson +# Copyright (c) 2017 Calen Pennington +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 Daniel Colascione + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""This module contains base classes and functions for the nodes and some +inference utils. +""" + +import builtins +import collections +import sys + +from astroid import context as contextmod +from astroid import exceptions +from astroid import util + +objectmodel = util.lazy_import("interpreter.objectmodel") +helpers = util.lazy_import("helpers") +BUILTINS = builtins.__name__ +manager = util.lazy_import("manager") +MANAGER = manager.AstroidManager() + +if sys.version_info >= (3, 0): + # TODO: check if needs special treatment + BUILTINS = "builtins" + BOOL_SPECIAL_METHOD = "__bool__" +else: + BUILTINS = "__builtin__" + BOOL_SPECIAL_METHOD = "__nonzero__" +PROPERTIES = {BUILTINS + ".property", "abc.abstractproperty"} +# List of possible property names. We use this list in order +# to see if a method is a property or not. This should be +# pretty reliable and fast, the alternative being to check each +# decorator to see if its a real property-like descriptor, which +# can be too complicated. +# Also, these aren't qualified, because each project can +# define them, we shouldn't expect to know every possible +# property-like decorator! +POSSIBLE_PROPERTIES = { + "cached_property", + "cachedproperty", + "lazyproperty", + "lazy_property", + "reify", + "lazyattribute", + "lazy_attribute", + "LazyProperty", + "lazy", + "cache_readonly", +} + + +def _is_property(meth): + if PROPERTIES.intersection(meth.decoratornames()): + return True + stripped = { + name.split(".")[-1] + for name in meth.decoratornames() + if name is not util.Uninferable + } + if any(name in stripped for name in POSSIBLE_PROPERTIES): + return True + + # Lookup for subclasses of *property* + if not meth.decorators: + return False + for decorator in meth.decorators.nodes or (): + inferred = helpers.safe_infer(decorator) + if inferred is None or inferred is util.Uninferable: + continue + if inferred.__class__.__name__ == "ClassDef": + for base_class in inferred.bases: + if base_class.__class__.__name__ != "Name": + continue + module, _ = base_class.lookup(base_class.name) + if module.name == BUILTINS and base_class.name == "property": + return True + + return False + + +class Proxy: + """a simple proxy object + + Note: + + Subclasses of this object will need a custom __getattr__ + if new instance attributes are created. See the Const class + """ + + _proxied = None # proxied object may be set by class or by instance + + def __init__(self, proxied=None): + if proxied is not None: + self._proxied = proxied + + def __getattr__(self, name): + if name == "_proxied": + return getattr(self.__class__, "_proxied") + if name in self.__dict__: + return self.__dict__[name] + return getattr(self._proxied, name) + + def infer(self, context=None): + yield self + + +def _infer_stmts(stmts, context, frame=None): + """Return an iterator on statements inferred by each statement in *stmts*.""" + inferred = False + if context is not None: + name = context.lookupname + context = context.clone() + else: + name = None + context = contextmod.InferenceContext() + + for stmt in stmts: + if stmt is util.Uninferable: + yield stmt + inferred = True + continue + context.lookupname = stmt._infer_name(frame, name) + try: + for inferred in stmt.infer(context=context): + yield inferred + inferred = True + except exceptions.NameInferenceError: + continue + except exceptions.InferenceError: + yield util.Uninferable + inferred = True + if not inferred: + raise exceptions.InferenceError( + "Inference failed for all members of {stmts!r}.", + stmts=stmts, + frame=frame, + context=context, + ) + + +def _infer_method_result_truth(instance, method_name, context): + # Get the method from the instance and try to infer + # its return's truth value. + meth = next(instance.igetattr(method_name, context=context), None) + if meth and hasattr(meth, "infer_call_result"): + if not meth.callable(): + return util.Uninferable + try: + for value in meth.infer_call_result(instance, context=context): + if value is util.Uninferable: + return value + + inferred = next(value.infer(context=context)) + return inferred.bool_value() + except exceptions.InferenceError: + pass + return util.Uninferable + + +class BaseInstance(Proxy): + """An instance base class, which provides lookup methods for potential instances.""" + + special_attributes = None + + def display_type(self): + return "Instance of" + + def getattr(self, name, context=None, lookupclass=True): + try: + values = self._proxied.instance_attr(name, context) + except exceptions.AttributeInferenceError as exc: + if self.special_attributes and name in self.special_attributes: + return [self.special_attributes.lookup(name)] + + if lookupclass: + # Class attributes not available through the instance + # unless they are explicitly defined. + return self._proxied.getattr(name, context, class_context=False) + + raise exceptions.AttributeInferenceError( + target=self, attribute=name, context=context + ) from exc + # since we've no context information, return matching class members as + # well + if lookupclass: + try: + return values + self._proxied.getattr( + name, context, class_context=False + ) + except exceptions.AttributeInferenceError: + pass + return values + + def igetattr(self, name, context=None): + """inferred getattr""" + if not context: + context = contextmod.InferenceContext() + try: + # avoid recursively inferring the same attr on the same class + if context.push((self._proxied, name)): + return + + # XXX frame should be self._proxied, or not ? + get_attr = self.getattr(name, context, lookupclass=False) + yield from _infer_stmts( + self._wrap_attr(get_attr, context), context, frame=self + ) + except exceptions.AttributeInferenceError as error: + try: + # fallback to class.igetattr since it has some logic to handle + # descriptors + # But only if the _proxied is the Class. + if self._proxied.__class__.__name__ != "ClassDef": + raise exceptions.InferenceError(**vars(error)) from error + attrs = self._proxied.igetattr(name, context, class_context=False) + yield from self._wrap_attr(attrs, context) + except exceptions.AttributeInferenceError as error: + raise exceptions.InferenceError(**vars(error)) from error + + def _wrap_attr(self, attrs, context=None): + """wrap bound methods of attrs in a InstanceMethod proxies""" + for attr in attrs: + if isinstance(attr, UnboundMethod): + if _is_property(attr): + yield from attr.infer_call_result(self, context) + else: + yield BoundMethod(attr, self) + elif hasattr(attr, "name") and attr.name == "": + # This is a lambda function defined at class level, + # since its scope is the underlying _proxied class. + # Unfortunately, we can't do an isinstance check here, + # because of the circular dependency between astroid.bases + # and astroid.scoped_nodes. + if attr.statement().scope() == self._proxied: + if attr.args.args and attr.args.args[0].name == "self": + yield BoundMethod(attr, self) + continue + yield attr + else: + yield attr + + def infer_call_result(self, caller, context=None): + """infer what a class instance is returning when called""" + context = contextmod.bind_context_to_node(context, self) + inferred = False + for node in self._proxied.igetattr("__call__", context): + if node is util.Uninferable or not node.callable(): + continue + for res in node.infer_call_result(caller, context): + inferred = True + yield res + if not inferred: + raise exceptions.InferenceError(node=self, caller=caller, context=context) + + +class Instance(BaseInstance): + """A special node representing a class instance.""" + + # pylint: disable=unnecessary-lambda + special_attributes = util.lazy_descriptor(lambda: objectmodel.InstanceModel()) + + def __repr__(self): + return "" % ( + self._proxied.root().name, + self._proxied.name, + id(self), + ) + + def __str__(self): + return "Instance of %s.%s" % (self._proxied.root().name, self._proxied.name) + + def callable(self): + try: + self._proxied.getattr("__call__", class_context=False) + return True + except exceptions.AttributeInferenceError: + return False + + def pytype(self): + return self._proxied.qname() + + def display_type(self): + return "Instance of" + + def bool_value(self): + """Infer the truth value for an Instance + + The truth value of an instance is determined by these conditions: + + * if it implements __bool__ on Python 3 or __nonzero__ + on Python 2, then its bool value will be determined by + calling this special method and checking its result. + * when this method is not defined, __len__() is called, if it + is defined, and the object is considered true if its result is + nonzero. If a class defines neither __len__() nor __bool__(), + all its instances are considered true. + """ + context = contextmod.InferenceContext() + context.callcontext = contextmod.CallContext(args=[]) + context.boundnode = self + + try: + result = _infer_method_result_truth(self, BOOL_SPECIAL_METHOD, context) + except (exceptions.InferenceError, exceptions.AttributeInferenceError): + # Fallback to __len__. + try: + result = _infer_method_result_truth(self, "__len__", context) + except (exceptions.AttributeInferenceError, exceptions.InferenceError): + return True + return result + + # This is set in inference.py. + def getitem(self, index, context=None): + pass + + +class UnboundMethod(Proxy): + """a special node representing a method not bound to an instance""" + + # pylint: disable=unnecessary-lambda + special_attributes = util.lazy_descriptor(lambda: objectmodel.UnboundMethodModel()) + + def __repr__(self): + frame = self._proxied.parent.frame() + return "<%s %s of %s at 0x%s" % ( + self.__class__.__name__, + self._proxied.name, + frame.qname(), + id(self), + ) + + def implicit_parameters(self): + return 0 + + def is_bound(self): + return False + + def getattr(self, name, context=None): + if name in self.special_attributes: + return [self.special_attributes.lookup(name)] + return self._proxied.getattr(name, context) + + def igetattr(self, name, context=None): + if name in self.special_attributes: + return iter((self.special_attributes.lookup(name),)) + return self._proxied.igetattr(name, context) + + def infer_call_result(self, caller, context): + """ + The boundnode of the regular context with a function called + on ``object.__new__`` will be of type ``object``, + which is incorrect for the argument in general. + If no context is given the ``object.__new__`` call argument will + correctly inferred except when inside a call that requires + the additional context (such as a classmethod) of the boundnode + to determine which class the method was called from + """ + + # If we're unbound method __new__ of builtin object, the result is an + # instance of the class given as first argument. + if ( + self._proxied.name == "__new__" + and self._proxied.parent.frame().qname() == "%s.object" % BUILTINS + ): + if caller.args: + node_context = context.extra_context.get(caller.args[0]) + infer = caller.args[0].infer(context=node_context) + else: + infer = [] + return (Instance(x) if x is not util.Uninferable else x for x in infer) + return self._proxied.infer_call_result(caller, context) + + def bool_value(self): + return True + + +class BoundMethod(UnboundMethod): + """a special node representing a method bound to an instance""" + + # pylint: disable=unnecessary-lambda + special_attributes = util.lazy_descriptor(lambda: objectmodel.BoundMethodModel()) + + def __init__(self, proxy, bound): + UnboundMethod.__init__(self, proxy) + self.bound = bound + + def implicit_parameters(self): + return 1 + + def is_bound(self): + return True + + def _infer_type_new_call(self, caller, context): + """Try to infer what type.__new__(mcs, name, bases, attrs) returns. + + In order for such call to be valid, the metaclass needs to be + a subtype of ``type``, the name needs to be a string, the bases + needs to be a tuple of classes + """ + from astroid import node_classes + + # Verify the metaclass + mcs = next(caller.args[0].infer(context=context)) + if mcs.__class__.__name__ != "ClassDef": + # Not a valid first argument. + return None + if not mcs.is_subtype_of("%s.type" % BUILTINS): + # Not a valid metaclass. + return None + + # Verify the name + name = next(caller.args[1].infer(context=context)) + if name.__class__.__name__ != "Const": + # Not a valid name, needs to be a const. + return None + if not isinstance(name.value, str): + # Needs to be a string. + return None + + # Verify the bases + bases = next(caller.args[2].infer(context=context)) + if bases.__class__.__name__ != "Tuple": + # Needs to be a tuple. + return None + inferred_bases = [next(elt.infer(context=context)) for elt in bases.elts] + if any(base.__class__.__name__ != "ClassDef" for base in inferred_bases): + # All the bases needs to be Classes + return None + + # Verify the attributes. + attrs = next(caller.args[3].infer(context=context)) + if attrs.__class__.__name__ != "Dict": + # Needs to be a dictionary. + return None + cls_locals = collections.defaultdict(list) + for key, value in attrs.items: + key = next(key.infer(context=context)) + value = next(value.infer(context=context)) + # Ignore non string keys + if key.__class__.__name__ == "Const" and isinstance(key.value, str): + cls_locals[key.value].append(value) + + # Build the class from now. + cls = mcs.__class__( + name=name.value, + lineno=caller.lineno, + col_offset=caller.col_offset, + parent=caller, + ) + empty = node_classes.Pass() + cls.postinit( + bases=bases.elts, + body=[empty], + decorators=[], + newstyle=True, + metaclass=mcs, + keywords=[], + ) + cls.locals = cls_locals + return cls + + def infer_call_result(self, caller, context=None): + context = contextmod.bind_context_to_node(context, self.bound) + if ( + self.bound.__class__.__name__ == "ClassDef" + and self.bound.name == "type" + and self.name == "__new__" + and len(caller.args) == 4 + ): + # Check if we have a ``type.__new__(mcs, name, bases, attrs)`` call. + new_cls = self._infer_type_new_call(caller, context) + if new_cls: + return iter((new_cls,)) + + return super(BoundMethod, self).infer_call_result(caller, context) + + def bool_value(self): + return True + + +class Generator(BaseInstance): + """a special node representing a generator. + + Proxied class is set once for all in raw_building. + """ + + # pylint: disable=unnecessary-lambda + special_attributes = util.lazy_descriptor(lambda: objectmodel.GeneratorModel()) + + # pylint: disable=super-init-not-called + def __init__(self, parent=None): + self.parent = parent + + def callable(self): + return False + + def pytype(self): + return 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b/venv/lib/python3.7/site-packages/astroid/brain/__pycache__/brain_uuid.cpython-37.pyc new file mode 100644 index 0000000..9393ff7 Binary files /dev/null and b/venv/lib/python3.7/site-packages/astroid/brain/__pycache__/brain_uuid.cpython-37.pyc differ diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_argparse.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_argparse.py new file mode 100644 index 0000000..d489911 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_argparse.py @@ -0,0 +1,33 @@ +from astroid import MANAGER, arguments, nodes, inference_tip, UseInferenceDefault + + +def infer_namespace(node, context=None): + callsite = arguments.CallSite.from_call(node) + if not callsite.keyword_arguments: + # Cannot make sense of it. + raise UseInferenceDefault() + + class_node = nodes.ClassDef("Namespace", "docstring") + class_node.parent = node.parent + for attr in set(callsite.keyword_arguments): + fake_node = nodes.EmptyNode() + fake_node.parent = class_node + fake_node.attrname = attr + class_node.instance_attrs[attr] = [fake_node] + return iter((class_node.instantiate_class(),)) + + +def _looks_like_namespace(node): + func = node.func + if isinstance(func, nodes.Attribute): + return ( + func.attrname == "Namespace" + and isinstance(func.expr, nodes.Name) + and func.expr.name == "argparse" + ) + return False + + +MANAGER.register_transform( + nodes.Call, inference_tip(infer_namespace), _looks_like_namespace +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_attrs.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_attrs.py new file mode 100644 index 0000000..a924128 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_attrs.py @@ -0,0 +1,59 @@ +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +""" +Astroid hook for the attrs library + +Without this hook pylint reports unsupported-assignment-operation +for attrs classes +""" + +import astroid +from astroid import MANAGER + + +ATTRIB_NAMES = frozenset(("attr.ib", "attrib", "attr.attrib")) +ATTRS_NAMES = frozenset(("attr.s", "attrs", "attr.attrs", "attr.attributes")) + + +def is_decorated_with_attrs(node, decorator_names=ATTRS_NAMES): + """Return True if a decorated node has + an attr decorator applied.""" + if not node.decorators: + return False + for decorator_attribute in node.decorators.nodes: + if isinstance(decorator_attribute, astroid.Call): # decorator with arguments + decorator_attribute = decorator_attribute.func + if decorator_attribute.as_string() in decorator_names: + return True + return False + + +def attr_attributes_transform(node): + """Given that the ClassNode has an attr decorator, + rewrite class attributes as instance attributes + """ + # Astroid can't infer this attribute properly + # Prevents https://github.com/PyCQA/pylint/issues/1884 + node.locals["__attrs_attrs__"] = [astroid.Unknown(parent=node)] + + for cdefbodynode in node.body: + if not isinstance(cdefbodynode, astroid.Assign): + continue + if isinstance(cdefbodynode.value, astroid.Call): + if cdefbodynode.value.func.as_string() not in ATTRIB_NAMES: + continue + else: + continue + for target in cdefbodynode.targets: + + rhs_node = astroid.Unknown( + lineno=cdefbodynode.lineno, + col_offset=cdefbodynode.col_offset, + parent=cdefbodynode, + ) + node.locals[target.name] = [rhs_node] + + +MANAGER.register_transform( + astroid.ClassDef, attr_attributes_transform, is_decorated_with_attrs +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_builtin_inference.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_builtin_inference.py new file mode 100644 index 0000000..1135f71 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_builtin_inference.py @@ -0,0 +1,822 @@ +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014-2015 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Rene Zhang +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for various builtins.""" + +from functools import partial +from textwrap import dedent + +import six +from astroid import ( + MANAGER, + Instance, + UseInferenceDefault, + AttributeInferenceError, + inference_tip, + InferenceError, + NameInferenceError, + AstroidTypeError, + MroError, +) +from astroid import arguments +from astroid.builder import AstroidBuilder +from astroid import helpers +from astroid import nodes +from astroid import objects +from astroid import scoped_nodes +from astroid import util + + +OBJECT_DUNDER_NEW = "object.__new__" + + +def _extend_str(class_node, rvalue): + """function to extend builtin str/unicode class""" + code = dedent( + """ + class whatever(object): + def join(self, iterable): + return {rvalue} + def replace(self, old, new, count=None): + return {rvalue} + def format(self, *args, **kwargs): + return {rvalue} + def encode(self, encoding='ascii', errors=None): + return '' + def decode(self, encoding='ascii', errors=None): + return u'' + def capitalize(self): + return {rvalue} + def title(self): + return {rvalue} + def lower(self): + return {rvalue} + def upper(self): + return {rvalue} + def swapcase(self): + return {rvalue} + def index(self, sub, start=None, end=None): + return 0 + def find(self, sub, start=None, end=None): + return 0 + def count(self, sub, start=None, end=None): + return 0 + def strip(self, chars=None): + return {rvalue} + def lstrip(self, chars=None): + return {rvalue} + def rstrip(self, chars=None): + return {rvalue} + def rjust(self, width, fillchar=None): + return {rvalue} + def center(self, width, fillchar=None): + return {rvalue} + def ljust(self, width, fillchar=None): + return {rvalue} + """ + ) + code = code.format(rvalue=rvalue) + fake = AstroidBuilder(MANAGER).string_build(code)["whatever"] + for method in fake.mymethods(): + method.parent = class_node + method.lineno = None + method.col_offset = None + if "__class__" in method.locals: + method.locals["__class__"] = [class_node] + class_node.locals[method.name] = [method] + method.parent = class_node + + +def _extend_builtins(class_transforms): + builtin_ast = MANAGER.builtins_module + for class_name, transform in class_transforms.items(): + transform(builtin_ast[class_name]) + + +_extend_builtins( + { + "bytes": partial(_extend_str, rvalue="b''"), + "str": partial(_extend_str, rvalue="''"), + } +) + + +def _builtin_filter_predicate(node, builtin_name): + if isinstance(node.func, nodes.Name) and node.func.name == builtin_name: + return True + if isinstance(node.func, nodes.Attribute): + return ( + node.func.attrname == "fromkeys" + and isinstance(node.func.expr, nodes.Name) + and node.func.expr.name == "dict" + ) + return False + + +def register_builtin_transform(transform, builtin_name): + """Register a new transform function for the given *builtin_name*. + + The transform function must accept two parameters, a node and + an optional context. + """ + + def _transform_wrapper(node, context=None): + result = transform(node, context=context) + if result: + if not result.parent: + # Let the transformation function determine + # the parent for its result. Otherwise, + # we set it to be the node we transformed from. + result.parent = node + + if result.lineno is None: + result.lineno = node.lineno + if result.col_offset is None: + result.col_offset = node.col_offset + return iter([result]) + + MANAGER.register_transform( + nodes.Call, + inference_tip(_transform_wrapper), + partial(_builtin_filter_predicate, builtin_name=builtin_name), + ) + + +def _generic_inference(node, context, node_type, transform): + args = node.args + if not args: + return node_type() + if len(node.args) > 1: + raise UseInferenceDefault() + + arg, = args + transformed = transform(arg) + if not transformed: + try: + inferred = next(arg.infer(context=context)) + except (InferenceError, StopIteration): + raise UseInferenceDefault() + if inferred is util.Uninferable: + raise UseInferenceDefault() + transformed = transform(inferred) + if not transformed or transformed is util.Uninferable: + raise UseInferenceDefault() + return transformed + + +def _generic_transform(arg, klass, iterables, build_elts): + if isinstance(arg, klass): + return arg + elif isinstance(arg, iterables): + if not all(isinstance(elt, nodes.Const) for elt in arg.elts): + raise UseInferenceDefault() + elts = [elt.value for elt in arg.elts] + elif isinstance(arg, nodes.Dict): + if not all(isinstance(elt[0], nodes.Const) for elt in arg.items): + raise UseInferenceDefault() + elts = [item[0].value for item in arg.items] + elif isinstance(arg, nodes.Const) and isinstance( + arg.value, (six.string_types, six.binary_type) + ): + elts = arg.value + else: + return + return klass.from_constants(elts=build_elts(elts)) + + +def _infer_builtin(node, context, klass=None, iterables=None, build_elts=None): + transform_func = partial( + _generic_transform, klass=klass, iterables=iterables, build_elts=build_elts + ) + + return _generic_inference(node, context, klass, transform_func) + + +# pylint: disable=invalid-name +infer_tuple = partial( + _infer_builtin, + klass=nodes.Tuple, + iterables=( + nodes.List, + nodes.Set, + objects.FrozenSet, + objects.DictItems, + objects.DictKeys, + objects.DictValues, + ), + build_elts=tuple, +) + +infer_list = partial( + _infer_builtin, + klass=nodes.List, + iterables=( + nodes.Tuple, + nodes.Set, + objects.FrozenSet, + objects.DictItems, + objects.DictKeys, + objects.DictValues, + ), + build_elts=list, +) + +infer_set = partial( + _infer_builtin, + klass=nodes.Set, + iterables=(nodes.List, nodes.Tuple, objects.FrozenSet, objects.DictKeys), + build_elts=set, +) + +infer_frozenset = partial( + _infer_builtin, + klass=objects.FrozenSet, + iterables=(nodes.List, nodes.Tuple, nodes.Set, objects.FrozenSet, objects.DictKeys), + build_elts=frozenset, +) + + +def _get_elts(arg, context): + is_iterable = lambda n: isinstance(n, (nodes.List, nodes.Tuple, nodes.Set)) + try: + inferred = next(arg.infer(context)) + except (InferenceError, NameInferenceError): + raise UseInferenceDefault() + if isinstance(inferred, nodes.Dict): + items = inferred.items + elif is_iterable(inferred): + items = [] + for elt in inferred.elts: + # If an item is not a pair of two items, + # then fallback to the default inference. + # Also, take in consideration only hashable items, + # tuples and consts. We are choosing Names as well. + if not is_iterable(elt): + raise UseInferenceDefault() + if len(elt.elts) != 2: + raise UseInferenceDefault() + if not isinstance(elt.elts[0], (nodes.Tuple, nodes.Const, nodes.Name)): + raise UseInferenceDefault() + items.append(tuple(elt.elts)) + else: + raise UseInferenceDefault() + return items + + +def infer_dict(node, context=None): + """Try to infer a dict call to a Dict node. + + The function treats the following cases: + + * dict() + * dict(mapping) + * dict(iterable) + * dict(iterable, **kwargs) + * dict(mapping, **kwargs) + * dict(**kwargs) + + If a case can't be inferred, we'll fallback to default inference. + """ + call = arguments.CallSite.from_call(node) + if call.has_invalid_arguments() or call.has_invalid_keywords(): + raise UseInferenceDefault + + args = call.positional_arguments + kwargs = list(call.keyword_arguments.items()) + + if not args and not kwargs: + # dict() + return nodes.Dict() + elif kwargs and not args: + # dict(a=1, b=2, c=4) + items = [(nodes.Const(key), value) for key, value in kwargs] + elif len(args) == 1 and kwargs: + # dict(some_iterable, b=2, c=4) + elts = _get_elts(args[0], context) + keys = [(nodes.Const(key), value) for key, value in kwargs] + items = elts + keys + elif len(args) == 1: + items = _get_elts(args[0], context) + else: + raise UseInferenceDefault() + + value = nodes.Dict( + col_offset=node.col_offset, lineno=node.lineno, parent=node.parent + ) + value.postinit(items) + return value + + +def infer_super(node, context=None): + """Understand super calls. + + There are some restrictions for what can be understood: + + * unbounded super (one argument form) is not understood. + + * if the super call is not inside a function (classmethod or method), + then the default inference will be used. + + * if the super arguments can't be inferred, the default inference + will be used. + """ + if len(node.args) == 1: + # Ignore unbounded super. + raise UseInferenceDefault + + scope = node.scope() + if not isinstance(scope, nodes.FunctionDef): + # Ignore non-method uses of super. + raise UseInferenceDefault + if scope.type not in ("classmethod", "method"): + # Not interested in staticmethods. + raise UseInferenceDefault + + cls = scoped_nodes.get_wrapping_class(scope) + if not len(node.args): + mro_pointer = cls + # In we are in a classmethod, the interpreter will fill + # automatically the class as the second argument, not an instance. + if scope.type == "classmethod": + mro_type = cls + else: + mro_type = cls.instantiate_class() + else: + try: + mro_pointer = next(node.args[0].infer(context=context)) + except InferenceError: + raise UseInferenceDefault + try: + mro_type = next(node.args[1].infer(context=context)) + except InferenceError: + raise UseInferenceDefault + + if mro_pointer is util.Uninferable or mro_type is util.Uninferable: + # No way we could understand this. + raise UseInferenceDefault + + super_obj = objects.Super( + mro_pointer=mro_pointer, mro_type=mro_type, self_class=cls, scope=scope + ) + super_obj.parent = node + return super_obj + + +def _infer_getattr_args(node, context): + if len(node.args) not in (2, 3): + # Not a valid getattr call. + raise UseInferenceDefault + + try: + obj = next(node.args[0].infer(context=context)) + attr = next(node.args[1].infer(context=context)) + except InferenceError: + raise UseInferenceDefault + + if obj is util.Uninferable or attr is util.Uninferable: + # If one of the arguments is something we can't infer, + # then also make the result of the getattr call something + # which is unknown. + return util.Uninferable, util.Uninferable + + is_string = isinstance(attr, nodes.Const) and isinstance( + attr.value, six.string_types + ) + if not is_string: + raise UseInferenceDefault + + return obj, attr.value + + +def infer_getattr(node, context=None): + """Understand getattr calls + + If one of the arguments is an Uninferable object, then the + result will be an Uninferable object. Otherwise, the normal attribute + lookup will be done. + """ + obj, attr = _infer_getattr_args(node, context) + if ( + obj is util.Uninferable + or attr is util.Uninferable + or not hasattr(obj, "igetattr") + ): + return util.Uninferable + + try: + return next(obj.igetattr(attr, context=context)) + except (StopIteration, InferenceError, AttributeInferenceError): + if len(node.args) == 3: + # Try to infer the default and return it instead. + try: + return next(node.args[2].infer(context=context)) + except InferenceError: + raise UseInferenceDefault + + raise UseInferenceDefault + + +def infer_hasattr(node, context=None): + """Understand hasattr calls + + This always guarantees three possible outcomes for calling + hasattr: Const(False) when we are sure that the object + doesn't have the intended attribute, Const(True) when + we know that the object has the attribute and Uninferable + when we are unsure of the outcome of the function call. + """ + try: + obj, attr = _infer_getattr_args(node, context) + if ( + obj is util.Uninferable + or attr is util.Uninferable + or not hasattr(obj, "getattr") + ): + return util.Uninferable + obj.getattr(attr, context=context) + except UseInferenceDefault: + # Can't infer something from this function call. + return util.Uninferable + except AttributeInferenceError: + # Doesn't have it. + return nodes.Const(False) + return nodes.Const(True) + + +def infer_callable(node, context=None): + """Understand callable calls + + This follows Python's semantics, where an object + is callable if it provides an attribute __call__, + even though that attribute is something which can't be + called. + """ + if len(node.args) != 1: + # Invalid callable call. + raise UseInferenceDefault + + argument = node.args[0] + try: + inferred = next(argument.infer(context=context)) + except InferenceError: + return util.Uninferable + if inferred is util.Uninferable: + return util.Uninferable + return nodes.Const(inferred.callable()) + + +def infer_bool(node, context=None): + """Understand bool calls.""" + if len(node.args) > 1: + # Invalid bool call. + raise UseInferenceDefault + + if not node.args: + return nodes.Const(False) + + argument = node.args[0] + try: + inferred = next(argument.infer(context=context)) + except InferenceError: + return util.Uninferable + if inferred is util.Uninferable: + return util.Uninferable + + bool_value = inferred.bool_value() + if bool_value is util.Uninferable: + return util.Uninferable + return nodes.Const(bool_value) + + +def infer_type(node, context=None): + """Understand the one-argument form of *type*.""" + if len(node.args) != 1: + raise UseInferenceDefault + + return helpers.object_type(node.args[0], context) + + +def infer_slice(node, context=None): + """Understand `slice` calls.""" + args = node.args + if not 0 < len(args) <= 3: + raise UseInferenceDefault + + infer_func = partial(helpers.safe_infer, context=context) + args = [infer_func(arg) for arg in args] + for arg in args: + if not arg or arg is util.Uninferable: + raise UseInferenceDefault + if not isinstance(arg, nodes.Const): + raise UseInferenceDefault + if not isinstance(arg.value, (type(None), int)): + raise UseInferenceDefault + + if len(args) < 3: + # Make sure we have 3 arguments. + args.extend([None] * (3 - len(args))) + + slice_node = nodes.Slice( + lineno=node.lineno, col_offset=node.col_offset, parent=node.parent + ) + slice_node.postinit(*args) + return slice_node + + +def _infer_object__new__decorator(node, context=None): + # Instantiate class immediately + # since that's what @object.__new__ does + return iter((node.instantiate_class(),)) + + +def _infer_object__new__decorator_check(node): + """Predicate before inference_tip + + Check if the given ClassDef has an @object.__new__ decorator + """ + if not node.decorators: + return False + + for decorator in node.decorators.nodes: + if isinstance(decorator, nodes.Attribute): + if decorator.as_string() == OBJECT_DUNDER_NEW: + return True + return False + + +def infer_issubclass(callnode, context=None): + """Infer issubclass() calls + + :param nodes.Call callnode: an `issubclass` call + :param InferenceContext: the context for the inference + :rtype nodes.Const: Boolean Const value of the `issubclass` call + :raises UseInferenceDefault: If the node cannot be inferred + """ + call = arguments.CallSite.from_call(callnode) + if call.keyword_arguments: + # issubclass doesn't support keyword arguments + raise UseInferenceDefault("TypeError: issubclass() takes no keyword arguments") + if len(call.positional_arguments) != 2: + raise UseInferenceDefault( + "Expected two arguments, got {count}".format( + count=len(call.positional_arguments) + ) + ) + # The left hand argument is the obj to be checked + obj_node, class_or_tuple_node = call.positional_arguments + + try: + obj_type = next(obj_node.infer(context=context)) + except InferenceError as exc: + raise UseInferenceDefault from exc + if not isinstance(obj_type, nodes.ClassDef): + raise UseInferenceDefault("TypeError: arg 1 must be class") + + # The right hand argument is the class(es) that the given + # object is to be checked against. + try: + class_container = _class_or_tuple_to_container( + class_or_tuple_node, context=context + ) + except InferenceError as exc: + raise UseInferenceDefault from exc + try: + issubclass_bool = helpers.object_issubclass(obj_type, class_container, context) + except AstroidTypeError as exc: + raise UseInferenceDefault("TypeError: " + str(exc)) from exc + except MroError as exc: + raise UseInferenceDefault from exc + return nodes.Const(issubclass_bool) + + +def infer_isinstance(callnode, context=None): + """Infer isinstance calls + + :param nodes.Call callnode: an isinstance call + :param InferenceContext: context for call + (currently unused but is a common interface for inference) + :rtype nodes.Const: Boolean Const value of isinstance call + + :raises UseInferenceDefault: If the node cannot be inferred + """ + call = arguments.CallSite.from_call(callnode) + if call.keyword_arguments: + # isinstance doesn't support keyword arguments + raise UseInferenceDefault("TypeError: isinstance() takes no keyword arguments") + if len(call.positional_arguments) != 2: + raise UseInferenceDefault( + "Expected two arguments, got {count}".format( + count=len(call.positional_arguments) + ) + ) + # The left hand argument is the obj to be checked + obj_node, class_or_tuple_node = call.positional_arguments + # The right hand argument is the class(es) that the given + # obj is to be check is an instance of + try: + class_container = _class_or_tuple_to_container( + class_or_tuple_node, context=context + ) + except InferenceError: + raise UseInferenceDefault + try: + isinstance_bool = helpers.object_isinstance(obj_node, class_container, context) + except AstroidTypeError as exc: + raise UseInferenceDefault("TypeError: " + str(exc)) + except MroError as exc: + raise UseInferenceDefault from exc + if isinstance_bool is util.Uninferable: + raise UseInferenceDefault + return nodes.Const(isinstance_bool) + + +def _class_or_tuple_to_container(node, context=None): + # Move inferences results into container + # to simplify later logic + # raises InferenceError if any of the inferences fall through + node_infer = next(node.infer(context=context)) + # arg2 MUST be a type or a TUPLE of types + # for isinstance + if isinstance(node_infer, nodes.Tuple): + class_container = [ + next(node.infer(context=context)) for node in node_infer.elts + ] + class_container = [ + klass_node for klass_node in class_container if klass_node is not None + ] + else: + class_container = [node_infer] + return class_container + + +def infer_len(node, context=None): + """Infer length calls + + :param nodes.Call node: len call to infer + :param context.InferenceContext: node context + :rtype nodes.Const: a Const node with the inferred length, if possible + """ + call = arguments.CallSite.from_call(node) + if call.keyword_arguments: + raise UseInferenceDefault("TypeError: len() must take no keyword arguments") + if len(call.positional_arguments) != 1: + raise UseInferenceDefault( + "TypeError: len() must take exactly one argument " + "({len}) given".format(len=len(call.positional_arguments)) + ) + [argument_node] = call.positional_arguments + try: + return nodes.Const(helpers.object_len(argument_node)) + except (AstroidTypeError, InferenceError) as exc: + raise UseInferenceDefault(str(exc)) from exc + + +def infer_str(node, context=None): + """Infer str() calls + + :param nodes.Call node: str() call to infer + :param context.InferenceContext: node context + :rtype nodes.Const: a Const containing an empty string + """ + call = arguments.CallSite.from_call(node) + if call.keyword_arguments: + raise UseInferenceDefault("TypeError: str() must take no keyword arguments") + try: + return nodes.Const("") + except (AstroidTypeError, InferenceError) as exc: + raise UseInferenceDefault(str(exc)) from exc + + +def infer_int(node, context=None): + """Infer int() calls + + :param nodes.Call node: int() call to infer + :param context.InferenceContext: node context + :rtype nodes.Const: a Const containing the integer value of the int() call + """ + call = arguments.CallSite.from_call(node) + if call.keyword_arguments: + raise UseInferenceDefault("TypeError: int() must take no keyword arguments") + + if call.positional_arguments: + try: + first_value = next(call.positional_arguments[0].infer(context=context)) + except InferenceError as exc: + raise UseInferenceDefault(str(exc)) from exc + + if first_value is util.Uninferable: + raise UseInferenceDefault + + if isinstance(first_value, nodes.Const) and isinstance( + first_value.value, (int, str) + ): + try: + actual_value = int(first_value.value) + except ValueError: + return nodes.Const(0) + return nodes.Const(actual_value) + + return nodes.Const(0) + + +def infer_dict_fromkeys(node, context=None): + """Infer dict.fromkeys + + :param nodes.Call node: dict.fromkeys() call to infer + :param context.InferenceContext: node context + :rtype nodes.Dict: + a Dictionary containing the values that astroid was able to infer. + In case the inference failed for any reason, an empty dictionary + will be inferred instead. + """ + + def _build_dict_with_elements(elements): + new_node = nodes.Dict( + col_offset=node.col_offset, lineno=node.lineno, parent=node.parent + ) + new_node.postinit(elements) + return new_node + + call = arguments.CallSite.from_call(node) + if call.keyword_arguments: + raise UseInferenceDefault("TypeError: int() must take no keyword arguments") + if len(call.positional_arguments) not in {1, 2}: + raise UseInferenceDefault( + "TypeError: Needs between 1 and 2 positional arguments" + ) + + default = nodes.Const(None) + values = call.positional_arguments[0] + try: + inferred_values = next(values.infer(context=context)) + except InferenceError: + return _build_dict_with_elements([]) + if inferred_values is util.Uninferable: + return _build_dict_with_elements([]) + + # Limit to a couple of potential values, as this can become pretty complicated + accepted_iterable_elements = (nodes.Const,) + if isinstance(inferred_values, (nodes.List, nodes.Set, nodes.Tuple)): + elements = inferred_values.elts + for element in elements: + if not isinstance(element, accepted_iterable_elements): + # Fallback to an empty dict + return _build_dict_with_elements([]) + + elements_with_value = [(element, default) for element in elements] + return _build_dict_with_elements(elements_with_value) + + elif isinstance(inferred_values, nodes.Const) and isinstance( + inferred_values.value, (str, bytes) + ): + elements = [ + (nodes.Const(element), default) for element in inferred_values.value + ] + return _build_dict_with_elements(elements) + elif isinstance(inferred_values, nodes.Dict): + keys = inferred_values.itered() + for key in keys: + if not isinstance(key, accepted_iterable_elements): + # Fallback to an empty dict + return _build_dict_with_elements([]) + + elements_with_value = [(element, default) for element in keys] + return _build_dict_with_elements(elements_with_value) + + # Fallback to an empty dictionary + return _build_dict_with_elements([]) + + +# Builtins inference +register_builtin_transform(infer_bool, "bool") +register_builtin_transform(infer_super, "super") +register_builtin_transform(infer_callable, "callable") +register_builtin_transform(infer_getattr, "getattr") +register_builtin_transform(infer_hasattr, "hasattr") +register_builtin_transform(infer_tuple, "tuple") +register_builtin_transform(infer_set, "set") +register_builtin_transform(infer_list, "list") +register_builtin_transform(infer_dict, "dict") +register_builtin_transform(infer_frozenset, "frozenset") +register_builtin_transform(infer_type, "type") +register_builtin_transform(infer_slice, "slice") +register_builtin_transform(infer_isinstance, "isinstance") +register_builtin_transform(infer_issubclass, "issubclass") +register_builtin_transform(infer_len, "len") +register_builtin_transform(infer_str, "str") +register_builtin_transform(infer_int, "int") +register_builtin_transform(infer_dict_fromkeys, "dict.fromkeys") + + +# Infer object.__new__ calls +MANAGER.register_transform( + nodes.ClassDef, + inference_tip(_infer_object__new__decorator), + _infer_object__new__decorator_check, +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_collections.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_collections.py new file mode 100644 index 0000000..b9eb9b9 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_collections.py @@ -0,0 +1,82 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2016, 2018 Claudiu Popa +# Copyright (c) 2016-2017 Łukasz Rogalski +# Copyright (c) 2017 Derek Gustafson +# Copyright (c) 2018 Ioana Tagirta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +import sys + +import astroid + +PY34 = sys.version_info >= (3, 4) +PY35 = sys.version_info >= (3, 5) + + +def _collections_transform(): + return astroid.parse( + """ + class defaultdict(dict): + default_factory = None + def __missing__(self, key): pass + def __getitem__(self, key): return default_factory + + """ + + _deque_mock() + + _ordered_dict_mock() + ) + + +def _deque_mock(): + base_deque_class = """ + class deque(object): + maxlen = 0 + def __init__(self, iterable=None, maxlen=None): + self.iterable = iterable or [] + def append(self, x): pass + def appendleft(self, x): pass + def clear(self): pass + def count(self, x): return 0 + def extend(self, iterable): pass + def extendleft(self, iterable): pass + def pop(self): return self.iterable[0] + def popleft(self): return self.iterable[0] + def remove(self, value): pass + def reverse(self): return reversed(self.iterable) + def rotate(self, n=1): return self + def __iter__(self): return self + def __reversed__(self): return self.iterable[::-1] + def __getitem__(self, index): return self.iterable[index] + def __setitem__(self, index, value): pass + def __delitem__(self, index): pass + def __bool__(self): return bool(self.iterable) + def __nonzero__(self): return bool(self.iterable) + def __contains__(self, o): return o in self.iterable + def __len__(self): return len(self.iterable) + def __copy__(self): return deque(self.iterable)""" + if PY35: + base_deque_class += """ + def copy(self): return deque(self.iterable) + def index(self, x, start=0, end=0): return 0 + def insert(self, x, i): pass + def __add__(self, other): pass + def __iadd__(self, other): pass + def __mul__(self, other): pass + def __imul__(self, other): pass + def __rmul__(self, other): pass""" + return base_deque_class + + +def _ordered_dict_mock(): + base_ordered_dict_class = """ + class OrderedDict(dict): + def __reversed__(self): return self[::-1] + """ + if PY34: + base_ordered_dict_class += """ + def move_to_end(self, key, last=False): pass""" + return base_ordered_dict_class + + +astroid.register_module_extender(astroid.MANAGER, "collections", _collections_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_curses.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_curses.py new file mode 100644 index 0000000..68e88b9 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_curses.py @@ -0,0 +1,179 @@ +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +import astroid + + +def _curses_transform(): + return astroid.parse( + """ + A_ALTCHARSET = 1 + A_BLINK = 1 + A_BOLD = 1 + A_DIM = 1 + A_INVIS = 1 + A_ITALIC = 1 + A_NORMAL = 1 + A_PROTECT = 1 + A_REVERSE = 1 + A_STANDOUT = 1 + A_UNDERLINE = 1 + A_HORIZONTAL = 1 + A_LEFT = 1 + A_LOW = 1 + A_RIGHT = 1 + A_TOP = 1 + A_VERTICAL = 1 + A_CHARTEXT = 1 + A_ATTRIBUTES = 1 + A_CHARTEXT = 1 + A_COLOR = 1 + KEY_MIN = 1 + KEY_BREAK = 1 + KEY_DOWN = 1 + KEY_UP = 1 + KEY_LEFT = 1 + KEY_RIGHT = 1 + KEY_HOME = 1 + KEY_BACKSPACE = 1 + KEY_F0 = 1 + KEY_Fn = 1 + KEY_DL = 1 + KEY_IL = 1 + KEY_DC = 1 + KEY_IC = 1 + KEY_EIC = 1 + KEY_CLEAR = 1 + KEY_EOS = 1 + KEY_EOL = 1 + KEY_SF = 1 + KEY_SR = 1 + KEY_NPAGE = 1 + KEY_PPAGE = 1 + KEY_STAB = 1 + KEY_CTAB = 1 + KEY_CATAB = 1 + KEY_ENTER = 1 + KEY_SRESET = 1 + KEY_RESET = 1 + KEY_PRINT = 1 + KEY_LL = 1 + KEY_A1 = 1 + KEY_A3 = 1 + KEY_B2 = 1 + KEY_C1 = 1 + KEY_C3 = 1 + KEY_BTAB = 1 + KEY_BEG = 1 + KEY_CANCEL = 1 + KEY_CLOSE = 1 + KEY_COMMAND = 1 + KEY_COPY = 1 + KEY_CREATE = 1 + KEY_END = 1 + KEY_EXIT = 1 + KEY_FIND = 1 + KEY_HELP = 1 + KEY_MARK = 1 + KEY_MESSAGE = 1 + KEY_MOVE = 1 + KEY_NEXT = 1 + KEY_OPEN = 1 + KEY_OPTIONS = 1 + KEY_PREVIOUS = 1 + KEY_REDO = 1 + KEY_REFERENCE = 1 + KEY_REFRESH = 1 + KEY_REPLACE = 1 + KEY_RESTART = 1 + KEY_RESUME = 1 + KEY_SAVE = 1 + KEY_SBEG = 1 + KEY_SCANCEL = 1 + KEY_SCOMMAND = 1 + KEY_SCOPY = 1 + KEY_SCREATE = 1 + KEY_SDC = 1 + KEY_SDL = 1 + KEY_SELECT = 1 + KEY_SEND = 1 + KEY_SEOL = 1 + KEY_SEXIT = 1 + KEY_SFIND = 1 + KEY_SHELP = 1 + KEY_SHOME = 1 + KEY_SIC = 1 + KEY_SLEFT = 1 + KEY_SMESSAGE = 1 + KEY_SMOVE = 1 + KEY_SNEXT = 1 + KEY_SOPTIONS = 1 + KEY_SPREVIOUS = 1 + KEY_SPRINT = 1 + KEY_SREDO = 1 + KEY_SREPLACE = 1 + KEY_SRIGHT = 1 + KEY_SRSUME = 1 + KEY_SSAVE = 1 + KEY_SSUSPEND = 1 + KEY_SUNDO = 1 + KEY_SUSPEND = 1 + KEY_UNDO = 1 + KEY_MOUSE = 1 + KEY_RESIZE = 1 + KEY_MAX = 1 + ACS_BBSS = 1 + ACS_BLOCK = 1 + ACS_BOARD = 1 + ACS_BSBS = 1 + ACS_BSSB = 1 + ACS_BSSS = 1 + ACS_BTEE = 1 + ACS_BULLET = 1 + ACS_CKBOARD = 1 + ACS_DARROW = 1 + ACS_DEGREE = 1 + ACS_DIAMOND = 1 + ACS_GEQUAL = 1 + ACS_HLINE = 1 + ACS_LANTERN = 1 + ACS_LARROW = 1 + ACS_LEQUAL = 1 + ACS_LLCORNER = 1 + ACS_LRCORNER = 1 + ACS_LTEE = 1 + ACS_NEQUAL = 1 + ACS_PI = 1 + ACS_PLMINUS = 1 + ACS_PLUS = 1 + ACS_RARROW = 1 + ACS_RTEE = 1 + ACS_S1 = 1 + ACS_S3 = 1 + ACS_S7 = 1 + ACS_S9 = 1 + ACS_SBBS = 1 + ACS_SBSB = 1 + ACS_SBSS = 1 + ACS_SSBB = 1 + ACS_SSBS = 1 + ACS_SSSB = 1 + ACS_SSSS = 1 + ACS_STERLING = 1 + ACS_TTEE = 1 + ACS_UARROW = 1 + ACS_ULCORNER = 1 + ACS_URCORNER = 1 + ACS_VLINE = 1 + COLOR_BLACK = 1 + COLOR_BLUE = 1 + COLOR_CYAN = 1 + COLOR_GREEN = 1 + COLOR_MAGENTA = 1 + COLOR_RED = 1 + COLOR_WHITE = 1 + COLOR_YELLOW = 1 + """ + ) + + +astroid.register_module_extender(astroid.MANAGER, "curses", _curses_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_dateutil.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_dateutil.py new file mode 100644 index 0000000..a1c270f --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_dateutil.py @@ -0,0 +1,28 @@ +# Copyright (c) 2015-2016 Claudiu Popa +# Copyright (c) 2015 raylu +# Copyright (c) 2016 Ceridwen + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for dateutil""" + +import textwrap + +from astroid import MANAGER, register_module_extender +from astroid.builder import AstroidBuilder + + +def dateutil_transform(): + return AstroidBuilder(MANAGER).string_build( + textwrap.dedent( + """ + import datetime + def parse(timestr, parserinfo=None, **kwargs): + return datetime.datetime() + """ + ) + ) + + +register_module_extender(MANAGER, "dateutil.parser", dateutil_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_fstrings.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_fstrings.py new file mode 100644 index 0000000..7d8c7b6 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_fstrings.py @@ -0,0 +1,51 @@ +# Copyright (c) 2017 Claudiu Popa + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +import collections +import sys + +import astroid + + +def _clone_node_with_lineno(node, parent, lineno): + cls = node.__class__ + other_fields = node._other_fields + _astroid_fields = node._astroid_fields + init_params = {"lineno": lineno, "col_offset": node.col_offset, "parent": parent} + postinit_params = {param: getattr(node, param) for param in _astroid_fields} + if other_fields: + init_params.update({param: getattr(node, param) for param in other_fields}) + new_node = cls(**init_params) + if hasattr(node, "postinit") and _astroid_fields: + for param, child in postinit_params.items(): + if child and not isinstance(child, collections.Sequence): + cloned_child = _clone_node_with_lineno( + node=child, lineno=new_node.lineno, parent=new_node + ) + postinit_params[param] = cloned_child + new_node.postinit(**postinit_params) + return new_node + + +def _transform_formatted_value(node): + if node.value and node.value.lineno == 1: + if node.lineno != node.value.lineno: + new_node = astroid.FormattedValue( + lineno=node.lineno, col_offset=node.col_offset, parent=node.parent + ) + new_value = _clone_node_with_lineno( + node=node.value, lineno=node.lineno, parent=new_node + ) + new_node.postinit(value=new_value, format_spec=node.format_spec) + return new_node + + +if sys.version_info[:2] >= (3, 6): + # TODO: this fix tries to *patch* http://bugs.python.org/issue29051 + # The problem is that FormattedValue.value, which is a Name node, + # has wrong line numbers, usually 1. This creates problems for pylint, + # which expects correct line numbers for things such as message control. + astroid.MANAGER.register_transform( + astroid.FormattedValue, _transform_formatted_value + ) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_functools.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_functools.py new file mode 100644 index 0000000..726c82f --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_functools.py @@ -0,0 +1,157 @@ +# Copyright (c) 2016, 2018 Claudiu Popa +# Copyright (c) 2018 Bryce Guinta + +"""Astroid hooks for understanding functools library module.""" +from functools import partial +from itertools import chain + +import astroid +from astroid import arguments +from astroid import BoundMethod +from astroid import extract_node +from astroid import helpers +from astroid.interpreter import objectmodel +from astroid import MANAGER +from astroid import objects + + +LRU_CACHE = "functools.lru_cache" + + +class LruWrappedModel(objectmodel.FunctionModel): + """Special attribute model for functions decorated with functools.lru_cache. + + The said decorators patches at decoration time some functions onto + the decorated function. + """ + + @property + def attr___wrapped__(self): + return self._instance + + @property + def attr_cache_info(self): + cache_info = extract_node( + """ + from functools import _CacheInfo + _CacheInfo(0, 0, 0, 0) + """ + ) + + class CacheInfoBoundMethod(BoundMethod): + def infer_call_result(self, caller, context=None): + yield helpers.safe_infer(cache_info) + + return CacheInfoBoundMethod(proxy=self._instance, bound=self._instance) + + @property + def attr_cache_clear(self): + node = extract_node("""def cache_clear(self): pass""") + return BoundMethod(proxy=node, bound=self._instance.parent.scope()) + + +def _transform_lru_cache(node, context=None): + # TODO: this is not ideal, since the node should be immutable, + # but due to https://github.com/PyCQA/astroid/issues/354, + # there's not much we can do now. + # Replacing the node would work partially, because, + # in pylint, the old node would still be available, leading + # to spurious false positives. + node.special_attributes = LruWrappedModel()(node) + return + + +def _functools_partial_inference(node, context=None): + call = arguments.CallSite.from_call(node) + number_of_positional = len(call.positional_arguments) + if number_of_positional < 1: + raise astroid.UseInferenceDefault( + "functools.partial takes at least one argument" + ) + if number_of_positional == 1 and not call.keyword_arguments: + raise astroid.UseInferenceDefault( + "functools.partial needs at least to have some filled arguments" + ) + + partial_function = call.positional_arguments[0] + try: + inferred_wrapped_function = next(partial_function.infer(context=context)) + except astroid.InferenceError as exc: + raise astroid.UseInferenceDefault from exc + if inferred_wrapped_function is astroid.Uninferable: + raise astroid.UseInferenceDefault("Cannot infer the wrapped function") + if not isinstance(inferred_wrapped_function, astroid.FunctionDef): + raise astroid.UseInferenceDefault("The wrapped function is not a function") + + # Determine if the passed keywords into the callsite are supported + # by the wrapped function. + function_parameters = chain( + inferred_wrapped_function.args.args or (), + inferred_wrapped_function.args.kwonlyargs or (), + ) + parameter_names = set( + param.name + for param in function_parameters + if isinstance(param, astroid.AssignName) + ) + if set(call.keyword_arguments) - parameter_names: + raise astroid.UseInferenceDefault( + "wrapped function received unknown parameters" + ) + + partial_function = objects.PartialFunction( + call, + name=inferred_wrapped_function.name, + doc=inferred_wrapped_function.doc, + lineno=inferred_wrapped_function.lineno, + col_offset=inferred_wrapped_function.col_offset, + parent=inferred_wrapped_function.parent, + ) + partial_function.postinit( + args=inferred_wrapped_function.args, + body=inferred_wrapped_function.body, + decorators=inferred_wrapped_function.decorators, + returns=inferred_wrapped_function.returns, + type_comment_returns=inferred_wrapped_function.type_comment_returns, + type_comment_args=inferred_wrapped_function.type_comment_args, + ) + return iter((partial_function,)) + + +def _looks_like_lru_cache(node): + """Check if the given function node is decorated with lru_cache.""" + if not node.decorators: + return False + for decorator in node.decorators.nodes: + if not isinstance(decorator, astroid.Call): + continue + if _looks_like_functools_member(decorator, "lru_cache"): + return True + return False + + +def _looks_like_functools_member(node, member): + """Check if the given Call node is a functools.partial call""" + if isinstance(node.func, astroid.Name): + return node.func.name == member + elif isinstance(node.func, astroid.Attribute): + return ( + node.func.attrname == member + and isinstance(node.func.expr, astroid.Name) + and node.func.expr.name == "functools" + ) + + +_looks_like_partial = partial(_looks_like_functools_member, member="partial") + + +MANAGER.register_transform( + astroid.FunctionDef, _transform_lru_cache, _looks_like_lru_cache +) + + +MANAGER.register_transform( + astroid.Call, + astroid.inference_tip(_functools_partial_inference), + _looks_like_partial, +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_gi.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_gi.py new file mode 100644 index 0000000..0970610 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_gi.py @@ -0,0 +1,220 @@ +# Copyright (c) 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2014 Cole Robinson +# Copyright (c) 2015-2016 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 David Shea +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2016 Giuseppe Scrivano + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for the Python 2 GObject introspection bindings. + +Helps with understanding everything imported from 'gi.repository' +""" + +import inspect +import itertools +import sys +import re +import warnings + +from astroid import MANAGER, AstroidBuildingError, nodes +from astroid.builder import AstroidBuilder + + +_inspected_modules = {} + +_identifier_re = r"^[A-Za-z_]\w*$" + + +def _gi_build_stub(parent): + """ + Inspect the passed module recursively and build stubs for functions, + classes, etc. + """ + classes = {} + functions = {} + constants = {} + methods = {} + for name in dir(parent): + if name.startswith("__"): + continue + + # Check if this is a valid name in python + if not re.match(_identifier_re, name): + continue + + try: + obj = getattr(parent, name) + except: + continue + + if inspect.isclass(obj): + classes[name] = obj + elif inspect.isfunction(obj) or inspect.isbuiltin(obj): + functions[name] = obj + elif inspect.ismethod(obj) or inspect.ismethoddescriptor(obj): + methods[name] = obj + elif ( + str(obj).startswith(", ) + # Only accept function calls with two constant arguments + if len(node.args) != 2: + return False + + if not all(isinstance(arg, nodes.Const) for arg in node.args): + return False + + func = node.func + if isinstance(func, nodes.Attribute): + if func.attrname != "require_version": + return False + if isinstance(func.expr, nodes.Name) and func.expr.name == "gi": + return True + + return False + + if isinstance(func, nodes.Name): + return func.name == "require_version" + + return False + + +def _register_require_version(node): + # Load the gi.require_version locally + try: + import gi + + gi.require_version(node.args[0].value, node.args[1].value) + except Exception: + pass + + return node + + +MANAGER.register_failed_import_hook(_import_gi_module) +MANAGER.register_transform( + nodes.Call, _register_require_version, _looks_like_require_version +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_hashlib.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_hashlib.py new file mode 100644 index 0000000..98ae774 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_hashlib.py @@ -0,0 +1,67 @@ +# Copyright (c) 2016, 2018 Claudiu Popa +# Copyright (c) 2018 Ioana Tagirta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +import sys + +import six + +import astroid + +PY36 = sys.version_info >= (3, 6) + + +def _hashlib_transform(): + signature = "value=''" + template = """ + class %(name)s(object): + def __init__(self, %(signature)s): pass + def digest(self): + return %(digest)s + def copy(self): + return self + def update(self, value): pass + def hexdigest(self): + return '' + @property + def name(self): + return %(name)r + @property + def block_size(self): + return 1 + @property + def digest_size(self): + return 1 + """ + algorithms_with_signature = dict.fromkeys( + ["md5", "sha1", "sha224", "sha256", "sha384", "sha512"], signature + ) + if PY36: + blake2b_signature = "data=b'', *, digest_size=64, key=b'', salt=b'', \ + person=b'', fanout=1, depth=1, leaf_size=0, node_offset=0, \ + node_depth=0, inner_size=0, last_node=False" + blake2s_signature = "data=b'', *, digest_size=32, key=b'', salt=b'', \ + person=b'', fanout=1, depth=1, leaf_size=0, node_offset=0, \ + node_depth=0, inner_size=0, last_node=False" + new_algorithms = dict.fromkeys( + ["sha3_224", "sha3_256", "sha3_384", "sha3_512", "shake_128", "shake_256"], + signature, + ) + algorithms_with_signature.update(new_algorithms) + algorithms_with_signature.update( + {"blake2b": blake2b_signature, "blake2s": blake2s_signature} + ) + classes = "".join( + template + % { + "name": hashfunc, + "digest": 'b""' if six.PY3 else '""', + "signature": signature, + } + for hashfunc, signature in algorithms_with_signature.items() + ) + return astroid.parse(classes) + + +astroid.register_module_extender(astroid.MANAGER, "hashlib", _hashlib_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_http.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_http.py new file mode 100644 index 0000000..45a9db2 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_http.py @@ -0,0 +1,81 @@ +# Copyright (c) 2018 Claudiu Popa + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid brain hints for some of the `http` module.""" +import textwrap + +import astroid +from astroid.builder import AstroidBuilder + + +def _http_transform(): + return AstroidBuilder(astroid.MANAGER).string_build( + textwrap.dedent( + """ + from http import HTTPStatus + + CONTINUE = HTTPStatus.CONTINUE + SWITCHING_PROTOCOLS = HTTPStatus.SWITCHING_PROTOCOLS + PROCESSING = HTTPStatus.PROCESSING + OK = HTTPStatus.OK + CREATED = HTTPStatus.CREATED + ACCEPTED = HTTPStatus.ACCEPTED + NON_AUTHORITATIVE_INFORMATION = HTTPStatus.NON_AUTHORITATIVE_INFORMATION + NO_CONTENT = HTTPStatus.NO_CONTENT + RESET_CONTENT = HTTPStatus.RESET_CONTENT + PARTIAL_CONTENT = HTTPStatus.PARTIAL_CONTENT + MULTI_STATUS = HTTPStatus.MULTI_STATUS + ALREADY_REPORTED = HTTPStatus.ALREADY_REPORTED + IM_USED = HTTPStatus.IM_USED + MULTIPLE_CHOICES = HTTPStatus.MULTIPLE_CHOICES + MOVED_PERMANENTLY = HTTPStatus.MOVED_PERMANENTLY + FOUND = HTTPStatus.FOUND + SEE_OTHER = HTTPStatus.SEE_OTHER + NOT_MODIFIED = HTTPStatus.NOT_MODIFIED + USE_PROXY = HTTPStatus.USE_PROXY + TEMPORARY_REDIRECT = HTTPStatus.TEMPORARY_REDIRECT + PERMANENT_REDIRECT = HTTPStatus.PERMANENT_REDIRECT + BAD_REQUEST = HTTPStatus.BAD_REQUEST + UNAUTHORIZED = HTTPStatus.UNAUTHORIZED + PAYMENT_REQUIRED = HTTPStatus.PAYMENT_REQUIRED + FORBIDDEN = HTTPStatus.FORBIDDEN + NOT_FOUND = HTTPStatus.NOT_FOUND + METHOD_NOT_ALLOWED = HTTPStatus.METHOD_NOT_ALLOWED + NOT_ACCEPTABLE = HTTPStatus.NOT_ACCEPTABLE + PROXY_AUTHENTICATION_REQUIRED = HTTPStatus.PROXY_AUTHENTICATION_REQUIRED + REQUEST_TIMEOUT = HTTPStatus.REQUEST_TIMEOUT + CONFLICT = HTTPStatus.CONFLICT + GONE = HTTPStatus.GONE + LENGTH_REQUIRED = HTTPStatus.LENGTH_REQUIRED + PRECONDITION_FAILED = HTTPStatus.PRECONDITION_FAILED + REQUEST_ENTITY_TOO_LARGE = HTTPStatus.REQUEST_ENTITY_TOO_LARGE + REQUEST_URI_TOO_LONG = HTTPStatus.REQUEST_URI_TOO_LONG + UNSUPPORTED_MEDIA_TYPE = HTTPStatus.UNSUPPORTED_MEDIA_TYPE + REQUESTED_RANGE_NOT_SATISFIABLE = HTTPStatus.REQUESTED_RANGE_NOT_SATISFIABLE + EXPECTATION_FAILED = HTTPStatus.EXPECTATION_FAILED + UNPROCESSABLE_ENTITY = HTTPStatus.UNPROCESSABLE_ENTITY + LOCKED = HTTPStatus.LOCKED + FAILED_DEPENDENCY = HTTPStatus.FAILED_DEPENDENCY + UPGRADE_REQUIRED = HTTPStatus.UPGRADE_REQUIRED + PRECONDITION_REQUIRED = HTTPStatus.PRECONDITION_REQUIRED + TOO_MANY_REQUESTS = HTTPStatus.TOO_MANY_REQUESTS + REQUEST_HEADER_FIELDS_TOO_LARGE = HTTPStatus.REQUEST_HEADER_FIELDS_TOO_LARGE + INTERNAL_SERVER_ERROR = HTTPStatus.INTERNAL_SERVER_ERROR + NOT_IMPLEMENTED = HTTPStatus.NOT_IMPLEMENTED + BAD_GATEWAY = HTTPStatus.BAD_GATEWAY + SERVICE_UNAVAILABLE = HTTPStatus.SERVICE_UNAVAILABLE + GATEWAY_TIMEOUT = HTTPStatus.GATEWAY_TIMEOUT + HTTP_VERSION_NOT_SUPPORTED = HTTPStatus.HTTP_VERSION_NOT_SUPPORTED + VARIANT_ALSO_NEGOTIATES = HTTPStatus.VARIANT_ALSO_NEGOTIATES + INSUFFICIENT_STORAGE = HTTPStatus.INSUFFICIENT_STORAGE + LOOP_DETECTED = HTTPStatus.LOOP_DETECTED + NOT_EXTENDED = HTTPStatus.NOT_EXTENDED + NETWORK_AUTHENTICATION_REQUIRED = HTTPStatus.NETWORK_AUTHENTICATION_REQUIRED + """ + ) + ) + + +astroid.register_module_extender(astroid.MANAGER, "http.client", _http_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_io.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_io.py new file mode 100644 index 0000000..4c68922 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_io.py @@ -0,0 +1,45 @@ +# Copyright (c) 2016 Claudiu Popa + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid brain hints for some of the _io C objects.""" + +import astroid + + +BUFFERED = {"BufferedWriter", "BufferedReader"} +TextIOWrapper = "TextIOWrapper" +FileIO = "FileIO" +BufferedWriter = "BufferedWriter" + + +def _generic_io_transform(node, name, cls): + """Transform the given name, by adding the given *class* as a member of the node.""" + + io_module = astroid.MANAGER.ast_from_module_name("_io") + attribute_object = io_module[cls] + instance = attribute_object.instantiate_class() + node.locals[name] = [instance] + + +def _transform_text_io_wrapper(node): + # This is not always correct, since it can vary with the type of the descriptor, + # being stdout, stderr or stdin. But we cannot get access to the name of the + # stream, which is why we are using the BufferedWriter class as a default + # value + return _generic_io_transform(node, name="buffer", cls=BufferedWriter) + + +def _transform_buffered(node): + return _generic_io_transform(node, name="raw", cls=FileIO) + + +astroid.MANAGER.register_transform( + astroid.ClassDef, _transform_buffered, lambda node: node.name in BUFFERED +) +astroid.MANAGER.register_transform( + astroid.ClassDef, + _transform_text_io_wrapper, + lambda node: node.name == TextIOWrapper, +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_mechanize.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_mechanize.py new file mode 100644 index 0000000..93f282e --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_mechanize.py @@ -0,0 +1,29 @@ +# Copyright (c) 2012-2013 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2015-2016 Claudiu Popa +# Copyright (c) 2016 Ceridwen + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +from astroid import MANAGER, register_module_extender +from astroid.builder import AstroidBuilder + + +def mechanize_transform(): + return AstroidBuilder(MANAGER).string_build( + """ + +class Browser(object): + def open(self, url, data=None, timeout=None): + return None + def open_novisit(self, url, data=None, timeout=None): + return None + def open_local_file(self, filename): + return None + +""" + ) + + +register_module_extender(MANAGER, "mechanize", mechanize_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_multiprocessing.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_multiprocessing.py new file mode 100644 index 0000000..be575e9 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_multiprocessing.py @@ -0,0 +1,112 @@ +# Copyright (c) 2016 Claudiu Popa + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +import sys + +import astroid +from astroid import exceptions + + +PY34 = sys.version_info >= (3, 4) + + +def _multiprocessing_transform(): + module = astroid.parse( + """ + from multiprocessing.managers import SyncManager + def Manager(): + return SyncManager() + """ + ) + if not PY34: + return module + + # On Python 3.4, multiprocessing uses a getattr lookup inside contexts, + # in order to get the attributes they need. Since it's extremely + # dynamic, we use this approach to fake it. + node = astroid.parse( + """ + from multiprocessing.context import DefaultContext, BaseContext + default = DefaultContext() + base = BaseContext() + """ + ) + try: + context = next(node["default"].infer()) + base = next(node["base"].infer()) + except exceptions.InferenceError: + return module + + for node in (context, base): + for key, value in node.locals.items(): + if key.startswith("_"): + continue + + value = value[0] + if isinstance(value, astroid.FunctionDef): + # We need to rebound this, since otherwise + # it will have an extra argument (self). + value = astroid.BoundMethod(value, node) + module[key] = value + return module + + +def _multiprocessing_managers_transform(): + return astroid.parse( + """ + import array + import threading + import multiprocessing.pool as pool + + import six + + class Namespace(object): + pass + + class Value(object): + def __init__(self, typecode, value, lock=True): + self._typecode = typecode + self._value = value + def get(self): + return self._value + def set(self, value): + self._value = value + def __repr__(self): + return '%s(%r, %r)'%(type(self).__name__, self._typecode, self._value) + value = property(get, set) + + def Array(typecode, sequence, lock=True): + return array.array(typecode, sequence) + + class SyncManager(object): + Queue = JoinableQueue = six.moves.queue.Queue + Event = threading.Event + RLock = threading.RLock + BoundedSemaphore = threading.BoundedSemaphore + Condition = threading.Condition + Barrier = threading.Barrier + Pool = pool.Pool + list = list + dict = dict + Value = Value + Array = Array + Namespace = Namespace + __enter__ = lambda self: self + __exit__ = lambda *args: args + + def start(self, initializer=None, initargs=None): + pass + def shutdown(self): + pass + """ + ) + + +astroid.register_module_extender( + astroid.MANAGER, "multiprocessing.managers", _multiprocessing_managers_transform +) +astroid.register_module_extender( + astroid.MANAGER, "multiprocessing", _multiprocessing_transform +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_namedtuple_enum.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_namedtuple_enum.py new file mode 100644 index 0000000..c50ef04 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_namedtuple_enum.py @@ -0,0 +1,440 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2012-2015 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2013-2014 Google, Inc. +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Dmitry Pribysh +# Copyright (c) 2015 David Shea +# Copyright (c) 2015 Philip Lorenz +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2016 Mateusz Bysiek +# Copyright (c) 2017 Hugo +# Copyright (c) 2017 Łukasz Rogalski + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for the Python standard library.""" + +import functools +import keyword +from textwrap import dedent + +from astroid import MANAGER, UseInferenceDefault, inference_tip, InferenceError +from astroid import arguments +from astroid import exceptions +from astroid import nodes +from astroid.builder import AstroidBuilder, extract_node +from astroid import util + + +TYPING_NAMEDTUPLE_BASENAMES = {"NamedTuple", "typing.NamedTuple"} +ENUM_BASE_NAMES = { + "Enum", + "IntEnum", + "enum.Enum", + "enum.IntEnum", + "IntFlag", + "enum.IntFlag", +} + + +def _infer_first(node, context): + if node is util.Uninferable: + raise UseInferenceDefault + try: + value = next(node.infer(context=context)) + if value is util.Uninferable: + raise UseInferenceDefault() + else: + return value + except StopIteration: + raise InferenceError() + + +def _find_func_form_arguments(node, context): + def _extract_namedtuple_arg_or_keyword(position, key_name=None): + + if len(args) > position: + return _infer_first(args[position], context) + if key_name and key_name in found_keywords: + return _infer_first(found_keywords[key_name], context) + + args = node.args + keywords = node.keywords + found_keywords = ( + {keyword.arg: keyword.value for keyword in keywords} if keywords else {} + ) + + name = _extract_namedtuple_arg_or_keyword(position=0, key_name="typename") + names = _extract_namedtuple_arg_or_keyword(position=1, key_name="field_names") + if name and names: + return name.value, names + + raise UseInferenceDefault() + + +def infer_func_form(node, base_type, context=None, enum=False): + """Specific inference function for namedtuple or Python 3 enum. """ + # node is a Call node, class name as first argument and generated class + # attributes as second argument + + # namedtuple or enums list of attributes can be a list of strings or a + # whitespace-separate string + try: + name, names = _find_func_form_arguments(node, context) + try: + attributes = names.value.replace(",", " ").split() + except AttributeError: + if not enum: + attributes = [ + _infer_first(const, context).value for const in names.elts + ] + else: + # Enums supports either iterator of (name, value) pairs + # or mappings. + if hasattr(names, "items") and isinstance(names.items, list): + attributes = [ + _infer_first(const[0], context).value + for const in names.items + if isinstance(const[0], nodes.Const) + ] + elif hasattr(names, "elts"): + # Enums can support either ["a", "b", "c"] + # or [("a", 1), ("b", 2), ...], but they can't + # be mixed. + if all(isinstance(const, nodes.Tuple) for const in names.elts): + attributes = [ + _infer_first(const.elts[0], context).value + for const in names.elts + if isinstance(const, nodes.Tuple) + ] + else: + attributes = [ + _infer_first(const, context).value for const in names.elts + ] + else: + raise AttributeError + if not attributes: + raise AttributeError + except (AttributeError, exceptions.InferenceError): + raise UseInferenceDefault() + + # If we can't infer the name of the class, don't crash, up to this point + # we know it is a namedtuple anyway. + name = name or "Uninferable" + # we want to return a Class node instance with proper attributes set + class_node = nodes.ClassDef(name, "docstring") + class_node.parent = node.parent + # set base class=tuple + class_node.bases.append(base_type) + # XXX add __init__(*attributes) method + for attr in attributes: + fake_node = nodes.EmptyNode() + fake_node.parent = class_node + fake_node.attrname = attr + class_node.instance_attrs[attr] = [fake_node] + return class_node, name, attributes + + +def _has_namedtuple_base(node): + """Predicate for class inference tip + + :type node: ClassDef + :rtype: bool + """ + return set(node.basenames) & TYPING_NAMEDTUPLE_BASENAMES + + +def _looks_like(node, name): + func = node.func + if isinstance(func, nodes.Attribute): + return func.attrname == name + if isinstance(func, nodes.Name): + return func.name == name + return False + + +_looks_like_namedtuple = functools.partial(_looks_like, name="namedtuple") +_looks_like_enum = functools.partial(_looks_like, name="Enum") +_looks_like_typing_namedtuple = functools.partial(_looks_like, name="NamedTuple") + + +def infer_named_tuple(node, context=None): + """Specific inference function for namedtuple Call node""" + tuple_base_name = nodes.Name(name="tuple", parent=node.root()) + class_node, name, attributes = infer_func_form( + node, tuple_base_name, context=context + ) + call_site = arguments.CallSite.from_call(node) + func = next(extract_node("import collections; collections.namedtuple").infer()) + try: + rename = next(call_site.infer_argument(func, "rename", context)).bool_value() + except InferenceError: + rename = False + + if rename: + attributes = _get_renamed_namedtuple_attributes(attributes) + + replace_args = ", ".join("{arg}=None".format(arg=arg) for arg in attributes) + field_def = ( + " {name} = property(lambda self: self[{index:d}], " + "doc='Alias for field number {index:d}')" + ) + field_defs = "\n".join( + field_def.format(name=name, index=index) + for index, name in enumerate(attributes) + ) + fake = AstroidBuilder(MANAGER).string_build( + """ +class %(name)s(tuple): + __slots__ = () + _fields = %(fields)r + def _asdict(self): + return self.__dict__ + @classmethod + def _make(cls, iterable, new=tuple.__new__, len=len): + return new(cls, iterable) + def _replace(self, %(replace_args)s): + return self + def __getnewargs__(self): + return tuple(self) +%(field_defs)s + """ + % { + "name": name, + "fields": attributes, + "field_defs": field_defs, + "replace_args": replace_args, + } + ) + class_node.locals["_asdict"] = fake.body[0].locals["_asdict"] + class_node.locals["_make"] = fake.body[0].locals["_make"] + class_node.locals["_replace"] = fake.body[0].locals["_replace"] + class_node.locals["_fields"] = fake.body[0].locals["_fields"] + for attr in attributes: + class_node.locals[attr] = fake.body[0].locals[attr] + # we use UseInferenceDefault, we can't be a generator so return an iterator + return iter([class_node]) + + +def _get_renamed_namedtuple_attributes(field_names): + names = list(field_names) + seen = set() + for i, name in enumerate(field_names): + if ( + not all(c.isalnum() or c == "_" for c in name) + or keyword.iskeyword(name) + or not name + or name[0].isdigit() + or name.startswith("_") + or name in seen + ): + names[i] = "_%d" % i + seen.add(name) + return tuple(names) + + +def infer_enum(node, context=None): + """ Specific inference function for enum Call node. """ + enum_meta = extract_node( + """ + class EnumMeta(object): + 'docstring' + def __call__(self, node): + class EnumAttribute(object): + name = '' + value = 0 + return EnumAttribute() + def __iter__(self): + class EnumAttribute(object): + name = '' + value = 0 + return [EnumAttribute()] + def __reversed__(self): + class EnumAttribute(object): + name = '' + value = 0 + return (EnumAttribute, ) + def __next__(self): + return next(iter(self)) + def __getitem__(self, attr): + class Value(object): + @property + def name(self): + return '' + @property + def value(self): + return attr + + return Value() + __members__ = [''] + """ + ) + class_node = infer_func_form(node, enum_meta, context=context, enum=True)[0] + return iter([class_node.instantiate_class()]) + + +INT_FLAG_ADDITION_METHODS = """ + def __or__(self, other): + return {name}(self.value | other.value) + def __and__(self, other): + return {name}(self.value & other.value) + def __xor__(self, other): + return {name}(self.value ^ other.value) + def __add__(self, other): + return {name}(self.value + other.value) + def __div__(self, other): + return {name}(self.value / other.value) + def __invert__(self): + return {name}(~self.value) + def __mul__(self, other): + return {name}(self.value * other.value) +""" + + +def infer_enum_class(node): + """ Specific inference for enums. """ + for basename in node.basenames: + # TODO: doesn't handle subclasses yet. This implementation + # is a hack to support enums. + if basename not in ENUM_BASE_NAMES: + continue + if node.root().name == "enum": + # Skip if the class is directly from enum module. + break + for local, values in node.locals.items(): + if any(not isinstance(value, nodes.AssignName) for value in values): + continue + + targets = [] + stmt = values[0].statement() + if isinstance(stmt, nodes.Assign): + if isinstance(stmt.targets[0], nodes.Tuple): + targets = stmt.targets[0].itered() + else: + targets = stmt.targets + elif isinstance(stmt, nodes.AnnAssign): + targets = [stmt.target] + + inferred_return_value = None + if isinstance(stmt, nodes.Assign): + if isinstance(stmt.value, nodes.Const): + if isinstance(stmt.value.value, str): + inferred_return_value = repr(stmt.value.value) + else: + inferred_return_value = stmt.value.value + else: + inferred_return_value = stmt.value.as_string() + + new_targets = [] + for target in targets: + # Replace all the assignments with our mocked class. + classdef = dedent( + """ + class {name}({types}): + @property + def value(self): + return {return_value} + @property + def name(self): + return "{name}" + """.format( + name=target.name, + types=", ".join(node.basenames), + return_value=inferred_return_value, + ) + ) + if "IntFlag" in basename: + # Alright, we need to add some additional methods. + # Unfortunately we still can't infer the resulting objects as + # Enum members, but once we'll be able to do that, the following + # should result in some nice symbolic execution + classdef += INT_FLAG_ADDITION_METHODS.format(name=target.name) + + fake = AstroidBuilder(MANAGER).string_build(classdef)[target.name] + fake.parent = target.parent + for method in node.mymethods(): + fake.locals[method.name] = [method] + new_targets.append(fake.instantiate_class()) + node.locals[local] = new_targets + break + return node + + +def infer_typing_namedtuple_class(class_node, context=None): + """Infer a subclass of typing.NamedTuple""" + # Check if it has the corresponding bases + annassigns_fields = [ + annassign.target.name + for annassign in class_node.body + if isinstance(annassign, nodes.AnnAssign) + ] + code = dedent( + """ + from collections import namedtuple + namedtuple({typename!r}, {fields!r}) + """ + ).format(typename=class_node.name, fields=",".join(annassigns_fields)) + node = extract_node(code) + generated_class_node = next(infer_named_tuple(node, context)) + for method in class_node.mymethods(): + generated_class_node.locals[method.name] = [method] + return iter((generated_class_node,)) + + +def infer_typing_namedtuple(node, context=None): + """Infer a typing.NamedTuple(...) call.""" + # This is essentially a namedtuple with different arguments + # so we extract the args and infer a named tuple. + try: + func = next(node.func.infer()) + except InferenceError: + raise UseInferenceDefault + + if func.qname() != "typing.NamedTuple": + raise UseInferenceDefault + + if len(node.args) != 2: + raise UseInferenceDefault + + if not isinstance(node.args[1], (nodes.List, nodes.Tuple)): + raise UseInferenceDefault + + names = [] + for elt in node.args[1].elts: + if not isinstance(elt, (nodes.List, nodes.Tuple)): + raise UseInferenceDefault + if len(elt.elts) != 2: + raise UseInferenceDefault + names.append(elt.elts[0].as_string()) + + typename = node.args[0].as_string() + if names: + field_names = "({},)".format(",".join(names)) + else: + field_names = "''" + node = extract_node( + "namedtuple({typename}, {fields})".format(typename=typename, fields=field_names) + ) + return infer_named_tuple(node, context) + + +MANAGER.register_transform( + nodes.Call, inference_tip(infer_named_tuple), _looks_like_namedtuple +) +MANAGER.register_transform(nodes.Call, inference_tip(infer_enum), _looks_like_enum) +MANAGER.register_transform( + nodes.ClassDef, + infer_enum_class, + predicate=lambda cls: any( + basename for basename in cls.basenames if basename in ENUM_BASE_NAMES + ), +) +MANAGER.register_transform( + nodes.ClassDef, inference_tip(infer_typing_namedtuple_class), _has_namedtuple_base +) +MANAGER.register_transform( + nodes.Call, inference_tip(infer_typing_namedtuple), _looks_like_typing_namedtuple +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_nose.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_nose.py new file mode 100644 index 0000000..7b12d76 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_nose.py @@ -0,0 +1,77 @@ +# Copyright (c) 2015-2016 Claudiu Popa +# Copyright (c) 2016 Ceridwen + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +"""Hooks for nose library.""" + +import re +import textwrap + +import astroid +import astroid.builder + +_BUILDER = astroid.builder.AstroidBuilder(astroid.MANAGER) + + +def _pep8(name, caps=re.compile("([A-Z])")): + return caps.sub(lambda m: "_" + m.groups()[0].lower(), name) + + +def _nose_tools_functions(): + """Get an iterator of names and bound methods.""" + module = _BUILDER.string_build( + textwrap.dedent( + """ + import unittest + + class Test(unittest.TestCase): + pass + a = Test() + """ + ) + ) + try: + case = next(module["a"].infer()) + except astroid.InferenceError: + return + for method in case.methods(): + if method.name.startswith("assert") and "_" not in method.name: + pep8_name = _pep8(method.name) + yield pep8_name, astroid.BoundMethod(method, case) + if method.name == "assertEqual": + # nose also exports assert_equals. + yield "assert_equals", astroid.BoundMethod(method, case) + + +def _nose_tools_transform(node): + for method_name, method in _nose_tools_functions(): + node.locals[method_name] = [method] + + +def _nose_tools_trivial_transform(): + """Custom transform for the nose.tools module.""" + stub = _BUILDER.string_build("""__all__ = []""") + all_entries = ["ok_", "eq_"] + + for pep8_name, method in _nose_tools_functions(): + all_entries.append(pep8_name) + stub[pep8_name] = method + + # Update the __all__ variable, since nose.tools + # does this manually with .append. + all_assign = stub["__all__"].parent + all_object = astroid.List(all_entries) + all_object.parent = all_assign + all_assign.value = all_object + return stub + + +astroid.register_module_extender( + astroid.MANAGER, "nose.tools.trivial", _nose_tools_trivial_transform +) +astroid.MANAGER.register_transform( + astroid.Module, _nose_tools_transform, lambda n: n.name == "nose.tools" +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_numpy.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_numpy.py new file mode 100644 index 0000000..e6dfd8c --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_numpy.py @@ -0,0 +1,557 @@ +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2016 Ceridwen +# Copyright (c) 2017-2018 hippo91 + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +"""Astroid hooks for numpy.""" + +import functools +import astroid + + +def numpy_random_mtrand_transform(): + return astroid.parse( + """ + def beta(a, b, size=None): return uninferable + def binomial(n, p, size=None): return uninferable + def bytes(length): return uninferable + def chisquare(df, size=None): return uninferable + def choice(a, size=None, replace=True, p=None): return uninferable + def dirichlet(alpha, size=None): return uninferable + def exponential(scale=1.0, size=None): return uninferable + def f(dfnum, dfden, size=None): return uninferable + def gamma(shape, scale=1.0, size=None): return uninferable + def geometric(p, size=None): return uninferable + def get_state(): return uninferable + def gumbel(loc=0.0, scale=1.0, size=None): return uninferable + def hypergeometric(ngood, nbad, nsample, size=None): return uninferable + def laplace(loc=0.0, scale=1.0, size=None): return uninferable + def logistic(loc=0.0, scale=1.0, size=None): return uninferable + def lognormal(mean=0.0, sigma=1.0, size=None): return uninferable + def logseries(p, size=None): return uninferable + def multinomial(n, pvals, size=None): return uninferable + def multivariate_normal(mean, cov, size=None): return uninferable + def negative_binomial(n, p, size=None): return uninferable + def noncentral_chisquare(df, nonc, size=None): return uninferable + def noncentral_f(dfnum, dfden, nonc, size=None): return uninferable + def normal(loc=0.0, scale=1.0, size=None): return uninferable + def pareto(a, size=None): return uninferable + def permutation(x): return uninferable + def poisson(lam=1.0, size=None): return uninferable + def power(a, size=None): return uninferable + def rand(*args): return uninferable + def randint(low, high=None, size=None, dtype='l'): return uninferable + def randn(*args): return uninferable + def random_integers(low, high=None, size=None): return uninferable + def random_sample(size=None): return uninferable + def rayleigh(scale=1.0, size=None): return uninferable + def seed(seed=None): return uninferable + def set_state(state): return uninferable + def shuffle(x): return uninferable + def standard_cauchy(size=None): return uninferable + def standard_exponential(size=None): return uninferable + def standard_gamma(shape, size=None): return uninferable + def standard_normal(size=None): return uninferable + def standard_t(df, size=None): return uninferable + def triangular(left, mode, right, size=None): return uninferable + def uniform(low=0.0, high=1.0, size=None): return uninferable + def vonmises(mu, kappa, size=None): return uninferable + def wald(mean, scale, size=None): return uninferable + def weibull(a, size=None): return uninferable + def zipf(a, size=None): return uninferable + """ + ) + + +def numpy_core_umath_transform(): + ufunc_optional_keyword_arguments = ( + """out=None, where=True, casting='same_kind', order='K', """ + """dtype=None, subok=True""" + ) + return astroid.parse( + """ + # Constants + e = 2.718281828459045 + euler_gamma = 0.5772156649015329 + + # No arg functions + def geterrobj(): return uninferable + + # One arg functions + def seterrobj(errobj): return uninferable + + # One arg functions with optional kwargs + def arccos(x, {opt_args:s}): return uninferable + def arccosh(x, {opt_args:s}): return uninferable + def arcsin(x, {opt_args:s}): return uninferable + def arcsinh(x, {opt_args:s}): return uninferable + def arctan(x, {opt_args:s}): return uninferable + def arctanh(x, {opt_args:s}): return uninferable + def cbrt(x, {opt_args:s}): return uninferable + def conj(x, {opt_args:s}): return uninferable + def conjugate(x, {opt_args:s}): return uninferable + def cosh(x, {opt_args:s}): return uninferable + def deg2rad(x, {opt_args:s}): return uninferable + def degrees(x, {opt_args:s}): return uninferable + def exp2(x, {opt_args:s}): return uninferable + def expm1(x, {opt_args:s}): return uninferable + def fabs(x, {opt_args:s}): return uninferable + def frexp(x, {opt_args:s}): return uninferable + def isfinite(x, {opt_args:s}): return uninferable + def isinf(x, {opt_args:s}): return uninferable + def log(x, {opt_args:s}): return uninferable + def log1p(x, {opt_args:s}): return uninferable + def log2(x, {opt_args:s}): return uninferable + def logical_not(x, {opt_args:s}): return uninferable + def modf(x, {opt_args:s}): return uninferable + def negative(x, {opt_args:s}): return uninferable + def rad2deg(x, {opt_args:s}): return uninferable + def radians(x, {opt_args:s}): return uninferable + def reciprocal(x, {opt_args:s}): return uninferable + def rint(x, {opt_args:s}): return uninferable + def sign(x, {opt_args:s}): return uninferable + def signbit(x, {opt_args:s}): return uninferable + def sinh(x, {opt_args:s}): return uninferable + def spacing(x, {opt_args:s}): return uninferable + def square(x, {opt_args:s}): return uninferable + def tan(x, {opt_args:s}): return uninferable + def tanh(x, {opt_args:s}): return uninferable + def trunc(x, {opt_args:s}): return uninferable + + # Two args functions with optional kwargs + def bitwise_and(x1, x2, {opt_args:s}): return uninferable + def bitwise_or(x1, x2, {opt_args:s}): return uninferable + def bitwise_xor(x1, x2, {opt_args:s}): return uninferable + def copysign(x1, x2, {opt_args:s}): return uninferable + def divide(x1, x2, {opt_args:s}): return uninferable + def equal(x1, x2, {opt_args:s}): return uninferable + def float_power(x1, x2, {opt_args:s}): return uninferable + def floor_divide(x1, x2, {opt_args:s}): return uninferable + def fmax(x1, x2, {opt_args:s}): return uninferable + def fmin(x1, x2, {opt_args:s}): return uninferable + def fmod(x1, x2, {opt_args:s}): return uninferable + def greater(x1, x2, {opt_args:s}): return uninferable + def hypot(x1, x2, {opt_args:s}): return uninferable + def ldexp(x1, x2, {opt_args:s}): return uninferable + def left_shift(x1, x2, {opt_args:s}): return uninferable + def less(x1, x2, {opt_args:s}): return uninferable + def logaddexp(x1, x2, {opt_args:s}): return uninferable + def logaddexp2(x1, x2, {opt_args:s}): return uninferable + def logical_and(x1, x2, {opt_args:s}): return uninferable + def logical_or(x1, x2, {opt_args:s}): return uninferable + def logical_xor(x1, x2, {opt_args:s}): return uninferable + def maximum(x1, x2, {opt_args:s}): return uninferable + def minimum(x1, x2, {opt_args:s}): return uninferable + def nextafter(x1, x2, {opt_args:s}): return uninferable + def not_equal(x1, x2, {opt_args:s}): return uninferable + def power(x1, x2, {opt_args:s}): return uninferable + def remainder(x1, x2, {opt_args:s}): return uninferable + def right_shift(x1, x2, {opt_args:s}): return uninferable + def subtract(x1, x2, {opt_args:s}): return uninferable + def true_divide(x1, x2, {opt_args:s}): return uninferable + """.format( + opt_args=ufunc_optional_keyword_arguments + ) + ) + + +def numpy_core_numerictypes_transform(): + return astroid.parse( + """ + # different types defined in numerictypes.py + class generic(object): + def __init__(self, value): + self.T = None + self.base = None + self.data = None + self.dtype = None + self.flags = None + self.flat = None + self.imag = None + self.itemsize = None + self.nbytes = None + self.ndim = None + self.real = None + self.size = None + self.strides = None + + def all(self): return uninferable + def any(self): return uninferable + def argmax(self): return uninferable + def argmin(self): return uninferable + def argsort(self): return uninferable + def astype(self): return uninferable + def base(self): return uninferable + def byteswap(self): return uninferable + def choose(self): return uninferable + def clip(self): return uninferable + def compress(self): return uninferable + def conj(self): return uninferable + def conjugate(self): return uninferable + def copy(self): return uninferable + def cumprod(self): return uninferable + def cumsum(self): return uninferable + def data(self): return uninferable + def diagonal(self): return uninferable + def dtype(self): return uninferable + def dump(self): return uninferable + def dumps(self): return uninferable + def fill(self): return uninferable + def flags(self): return uninferable + def flat(self): return uninferable + def flatten(self): return uninferable + def getfield(self): return uninferable + def imag(self): return uninferable + def item(self): return uninferable + def itemset(self): return uninferable + def itemsize(self): return uninferable + def max(self): return uninferable + def mean(self): return uninferable + def min(self): return uninferable + def nbytes(self): return uninferable + def ndim(self): return uninferable + def newbyteorder(self): return uninferable + def nonzero(self): return uninferable + def prod(self): return uninferable + def ptp(self): return uninferable + def put(self): return uninferable + def ravel(self): return uninferable + def real(self): return uninferable + def repeat(self): return uninferable + def reshape(self): return uninferable + def resize(self): return uninferable + def round(self): return uninferable + def searchsorted(self): return uninferable + def setfield(self): return uninferable + def setflags(self): return uninferable + def shape(self): return uninferable + def size(self): return uninferable + def sort(self): return uninferable + def squeeze(self): return uninferable + def std(self): return uninferable + def strides(self): return uninferable + def sum(self): return uninferable + def swapaxes(self): return uninferable + def take(self): return uninferable + def tobytes(self): return uninferable + def tofile(self): return uninferable + def tolist(self): return uninferable + def tostring(self): return uninferable + def trace(self): return uninferable + def transpose(self): return uninferable + def var(self): return uninferable + def view(self): return uninferable + + + class dtype(object): + def __init__(self, obj, align=False, copy=False): + self.alignment = None + self.base = None + self.byteorder = None + self.char = None + self.descr = None + self.fields = None + self.flags = None + self.hasobject = None + self.isalignedstruct = None + self.isbuiltin = None + self.isnative = None + self.itemsize = None + self.kind = None + self.metadata = None + self.name = None + self.names = None + self.num = None + self.shape = None + self.str = None + self.subdtype = None + self.type = None + + def newbyteorder(self, new_order='S'): return uninferable + def __neg__(self): return uninferable + + + class ndarray(object): + def __init__(self, shape, dtype=float, buffer=None, offset=0, + strides=None, order=None): + self.T = None + self.base = None + self.ctypes = None + self.data = None + self.dtype = None + self.flags = None + self.flat = None + self.imag = None + self.itemsize = None + self.nbytes = None + self.ndim = None + self.real = None + self.shape = None + self.size = None + self.strides = None + + def __neg__(self): return uninferable + def __inv__(self): return uninferable + def __invert__(self): return uninferable + def all(self): return uninferable + def any(self): return uninferable + def argmax(self): return uninferable + def argmin(self): return uninferable + def argpartition(self): return uninferable + def argsort(self): return uninferable + def astype(self): return uninferable + def byteswap(self): return uninferable + def choose(self): return uninferable + def clip(self): return uninferable + def compress(self): return uninferable + def conj(self): return uninferable + def conjugate(self): return uninferable + def copy(self): return uninferable + def cumprod(self): return uninferable + def cumsum(self): return uninferable + def diagonal(self): return uninferable + def dot(self): return uninferable + def dump(self): return uninferable + def dumps(self): return uninferable + def fill(self): return uninferable + def flatten(self): return uninferable + def getfield(self): return uninferable + def item(self): return uninferable + def itemset(self): return uninferable + def max(self): return uninferable + def mean(self): return uninferable + def min(self): return uninferable + def newbyteorder(self): return uninferable + def nonzero(self): return uninferable + def partition(self): return uninferable + def prod(self): return uninferable + def ptp(self): return uninferable + def put(self): return uninferable + def ravel(self): return uninferable + def repeat(self): return uninferable + def reshape(self): return uninferable + def resize(self): return uninferable + def round(self): return uninferable + def searchsorted(self): return uninferable + def setfield(self): return uninferable + def setflags(self): return uninferable + def sort(self): return uninferable + def squeeze(self): return uninferable + def std(self): return uninferable + def sum(self): return uninferable + def swapaxes(self): return uninferable + def take(self): return uninferable + def tobytes(self): return uninferable + def tofile(self): return uninferable + def tolist(self): return uninferable + def tostring(self): return uninferable + def trace(self): return uninferable + def transpose(self): return uninferable + def var(self): return uninferable + def view(self): return uninferable + + + class busdaycalendar(object): + def __init__(self, weekmask='1111100', holidays=None): + self.holidays = None + self.weekmask = None + + class flexible(generic): pass + class bool_(generic): pass + class number(generic): + def __neg__(self): return uninferable + class datetime64(generic): pass + + + class void(flexible): + def __init__(self, *args, **kwargs): + self.base = None + self.dtype = None + self.flags = None + def getfield(self): return uninferable + def setfield(self): return uninferable + + + class character(flexible): pass + + + class integer(number): + def __init__(self, value): + self.denominator = None + self.numerator = None + + + class inexact(number): pass + + + class str_(str, character): + def maketrans(self, x, y=None, z=None): return uninferable + + + class bytes_(bytes, character): + def fromhex(self, string): return uninferable + def maketrans(self, frm, to): return uninferable + + + class signedinteger(integer): pass + + + class unsignedinteger(integer): pass + + + class complexfloating(inexact): pass + + + class floating(inexact): pass + + + class float64(floating, float): + def fromhex(self, string): return uninferable + + + class uint64(unsignedinteger): pass + class complex64(complexfloating): pass + class int16(signedinteger): pass + class float96(floating): pass + class int8(signedinteger): pass + class uint32(unsignedinteger): pass + class uint8(unsignedinteger): pass + class _typedict(dict): pass + class complex192(complexfloating): pass + class timedelta64(signedinteger): pass + class int32(signedinteger): pass + class uint16(unsignedinteger): pass + class float32(floating): pass + class complex128(complexfloating, complex): pass + class float16(floating): pass + class int64(signedinteger): pass + + buffer_type = memoryview + bool8 = bool_ + byte = int8 + bytes0 = bytes_ + cdouble = complex128 + cfloat = complex128 + clongdouble = complex192 + clongfloat = complex192 + complex_ = complex128 + csingle = complex64 + double = float64 + float_ = float64 + half = float16 + int0 = int32 + int_ = int32 + intc = int32 + intp = int32 + long = int32 + longcomplex = complex192 + longdouble = float96 + longfloat = float96 + longlong = int64 + object0 = object_ + object_ = object_ + short = int16 + single = float32 + singlecomplex = complex64 + str0 = str_ + string_ = bytes_ + ubyte = uint8 + uint = uint32 + uint0 = uint32 + uintc = uint32 + uintp = uint32 + ulonglong = uint64 + unicode = str_ + unicode_ = str_ + ushort = uint16 + void0 = void + """ + ) + + +def numpy_funcs(): + return astroid.parse( + """ + import builtins + def sum(a, axis=None, dtype=None, out=None, keepdims=None): + return builtins.sum(a) + """ + ) + + +def _looks_like_numpy_function(func_name, numpy_module_name, node): + """ + Return True if the current node correspond to the function inside + the numpy module in parameters + + :param node: the current node + :type node: FunctionDef + :param func_name: name of the function + :type func_name: str + :param numpy_module_name: name of the numpy module + :type numpy_module_name: str + :return: True if the current node correspond to the function looked for + :rtype: bool + """ + return node.name == func_name and node.parent.name == numpy_module_name + + +def numpy_function_infer_call_result(node): + """ + A wrapper around infer_call_result method bounded to the node. + + :param node: the node which infer_call_result should be filtered + :type node: FunctionDef + :return: a function that filter the results of the call to node.infer_call_result + :rtype: function + """ + #  Put the origin infer_call_result method into the closure + origin_infer_call_result = node.infer_call_result + + def infer_call_result_wrapper(caller=None, context=None): + """ + Call the origin infer_call_result method bounded to the node instance and + filter the results to remove List and Tuple instances + """ + unfiltered_infer_call_result = origin_infer_call_result(caller, context) + return ( + x + for x in unfiltered_infer_call_result + if not isinstance(x, (astroid.List, astroid.Tuple)) + ) + + return infer_call_result_wrapper + + +def _replace_numpy_function_infer_call_result(node, context=None): + node.infer_call_result = numpy_function_infer_call_result(node) + return + + +astroid.MANAGER.register_transform( + astroid.FunctionDef, + _replace_numpy_function_infer_call_result, + functools.partial( + _looks_like_numpy_function, "linspace", "numpy.core.function_base" + ), +) + +astroid.MANAGER.register_transform( + astroid.FunctionDef, + _replace_numpy_function_infer_call_result, + functools.partial(_looks_like_numpy_function, "array", "numpy.core.records"), +) + +astroid.register_module_extender( + astroid.MANAGER, "numpy.core.umath", numpy_core_umath_transform +) +astroid.register_module_extender( + astroid.MANAGER, "numpy.random.mtrand", numpy_random_mtrand_transform +) +astroid.register_module_extender( + astroid.MANAGER, "numpy.core.numerictypes", numpy_core_numerictypes_transform +) +astroid.register_module_extender(astroid.MANAGER, "numpy", numpy_funcs) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_pkg_resources.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_pkg_resources.py new file mode 100644 index 0000000..25e7649 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_pkg_resources.py @@ -0,0 +1,75 @@ +# Copyright (c) 2016, 2018 Claudiu Popa +# Copyright (c) 2016 Ceridwen + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +import astroid +from astroid import parse +from astroid import inference_tip +from astroid import register_module_extender +from astroid import MANAGER + + +def pkg_resources_transform(): + return parse( + """ +def require(*requirements): + return pkg_resources.working_set.require(*requirements) + +def run_script(requires, script_name): + return pkg_resources.working_set.run_script(requires, script_name) + +def iter_entry_points(group, name=None): + return pkg_resources.working_set.iter_entry_points(group, name) + +def resource_exists(package_or_requirement, resource_name): + return get_provider(package_or_requirement).has_resource(resource_name) + +def resource_isdir(package_or_requirement, resource_name): + return get_provider(package_or_requirement).resource_isdir( + resource_name) + +def resource_filename(package_or_requirement, resource_name): + return get_provider(package_or_requirement).get_resource_filename( + self, resource_name) + +def resource_stream(package_or_requirement, resource_name): + return get_provider(package_or_requirement).get_resource_stream( + self, resource_name) + +def resource_string(package_or_requirement, resource_name): + return get_provider(package_or_requirement).get_resource_string( + self, resource_name) + +def resource_listdir(package_or_requirement, resource_name): + return get_provider(package_or_requirement).resource_listdir( + resource_name) + +def extraction_error(): + pass + +def get_cache_path(archive_name, names=()): + extract_path = self.extraction_path or get_default_cache() + target_path = os.path.join(extract_path, archive_name+'-tmp', *names) + return target_path + +def postprocess(tempname, filename): + pass + +def set_extraction_path(path): + pass + +def cleanup_resources(force=False): + pass + +def get_distribution(dist): + return Distribution(dist) + +_namespace_packages = {} +""" + ) + + +register_module_extender(MANAGER, "pkg_resources", pkg_resources_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_pytest.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_pytest.py new file mode 100644 index 0000000..d7e3ac8 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_pytest.py @@ -0,0 +1,88 @@ +# Copyright (c) 2014-2016 Claudiu Popa +# Copyright (c) 2014 Jeff Quast +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2016 Florian Bruhin +# Copyright (c) 2016 Ceridwen + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for pytest.""" +from __future__ import absolute_import +from astroid import MANAGER, register_module_extender +from astroid.builder import AstroidBuilder + + +def pytest_transform(): + return AstroidBuilder(MANAGER).string_build( + """ + +try: + import _pytest.mark + import _pytest.recwarn + import _pytest.runner + import _pytest.python + import _pytest.skipping + import _pytest.assertion +except ImportError: + pass +else: + deprecated_call = _pytest.recwarn.deprecated_call + warns = _pytest.recwarn.warns + + exit = _pytest.runner.exit + fail = _pytest.runner.fail + skip = _pytest.runner.skip + importorskip = _pytest.runner.importorskip + + xfail = _pytest.skipping.xfail + mark = _pytest.mark.MarkGenerator() + raises = _pytest.python.raises + + # New in pytest 3.0 + try: + approx = _pytest.python.approx + register_assert_rewrite = _pytest.assertion.register_assert_rewrite + except AttributeError: + pass + + +# Moved in pytest 3.0 + +try: + import _pytest.freeze_support + freeze_includes = _pytest.freeze_support.freeze_includes +except ImportError: + try: + import _pytest.genscript + freeze_includes = _pytest.genscript.freeze_includes + except ImportError: + pass + +try: + import _pytest.debugging + set_trace = _pytest.debugging.pytestPDB().set_trace +except ImportError: + try: + import _pytest.pdb + set_trace = _pytest.pdb.pytestPDB().set_trace + except ImportError: + pass + +try: + import _pytest.fixtures + fixture = _pytest.fixtures.fixture + yield_fixture = _pytest.fixtures.yield_fixture +except ImportError: + try: + import _pytest.python + fixture = _pytest.python.fixture + yield_fixture = _pytest.python.yield_fixture + except ImportError: + pass +""" + ) + + +register_module_extender(MANAGER, "pytest", pytest_transform) +register_module_extender(MANAGER, "py.test", pytest_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_qt.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_qt.py new file mode 100644 index 0000000..d65f218 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_qt.py @@ -0,0 +1,82 @@ +# Copyright (c) 2015-2016 Claudiu Popa +# Copyright (c) 2016 Ceridwen +# Copyright (c) 2017 Roy Wright +# Copyright (c) 2018 Ashley Whetter + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for the PyQT library.""" + +from astroid import MANAGER, register_module_extender +from astroid.builder import AstroidBuilder +from astroid import nodes +from astroid import parse + + +def _looks_like_signal(node, signal_name="pyqtSignal"): + if "__class__" in node.instance_attrs: + try: + cls = node.instance_attrs["__class__"][0] + return cls.name == signal_name + except AttributeError: + # return False if the cls does not have a name attribute + pass + return False + + +def transform_pyqt_signal(node): + module = parse( + """ + class pyqtSignal(object): + def connect(self, slot, type=None, no_receiver_check=False): + pass + def disconnect(self, slot): + pass + def emit(self, *args): + pass + """ + ) + signal_cls = module["pyqtSignal"] + node.instance_attrs["emit"] = signal_cls["emit"] + node.instance_attrs["disconnect"] = signal_cls["disconnect"] + node.instance_attrs["connect"] = signal_cls["connect"] + + +def transform_pyside_signal(node): + module = parse( + """ + class NotPySideSignal(object): + def connect(self, receiver, type=None): + pass + def disconnect(self, receiver): + pass + def emit(self, *args): + pass + """ + ) + signal_cls = module["NotPySideSignal"] + node.instance_attrs["connect"] = signal_cls["connect"] + node.instance_attrs["disconnect"] = signal_cls["disconnect"] + node.instance_attrs["emit"] = signal_cls["emit"] + + +def pyqt4_qtcore_transform(): + return AstroidBuilder(MANAGER).string_build( + """ + +def SIGNAL(signal_name): pass + +class QObject(object): + def emit(self, signal): pass +""" + ) + + +register_module_extender(MANAGER, "PyQt4.QtCore", pyqt4_qtcore_transform) +MANAGER.register_transform(nodes.FunctionDef, transform_pyqt_signal, _looks_like_signal) +MANAGER.register_transform( + nodes.ClassDef, + transform_pyside_signal, + lambda node: node.qname() == "PySide.QtCore.Signal", +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_random.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_random.py new file mode 100644 index 0000000..5ec858a --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_random.py @@ -0,0 +1,75 @@ +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +import random + +import astroid +from astroid import helpers +from astroid import MANAGER + + +ACCEPTED_ITERABLES_FOR_SAMPLE = (astroid.List, astroid.Set, astroid.Tuple) + + +def _clone_node_with_lineno(node, parent, lineno): + cls = node.__class__ + other_fields = node._other_fields + _astroid_fields = node._astroid_fields + init_params = {"lineno": lineno, "col_offset": node.col_offset, "parent": parent} + postinit_params = {param: getattr(node, param) for param in _astroid_fields} + if other_fields: + init_params.update({param: getattr(node, param) for param in other_fields}) + new_node = cls(**init_params) + if hasattr(node, "postinit") and _astroid_fields: + new_node.postinit(**postinit_params) + return new_node + + +def infer_random_sample(node, context=None): + if len(node.args) != 2: + raise astroid.UseInferenceDefault + + length = node.args[1] + if not isinstance(length, astroid.Const): + raise astroid.UseInferenceDefault + if not isinstance(length.value, int): + raise astroid.UseInferenceDefault + + inferred_sequence = helpers.safe_infer(node.args[0], context=context) + if not inferred_sequence: + raise astroid.UseInferenceDefault + + if not isinstance(inferred_sequence, ACCEPTED_ITERABLES_FOR_SAMPLE): + raise astroid.UseInferenceDefault + + if length.value > len(inferred_sequence.elts): + # In this case, this will raise a ValueError + raise astroid.UseInferenceDefault + + try: + elts = random.sample(inferred_sequence.elts, length.value) + except ValueError: + raise astroid.UseInferenceDefault + + new_node = astroid.List( + lineno=node.lineno, col_offset=node.col_offset, parent=node.scope() + ) + new_elts = [ + _clone_node_with_lineno(elt, parent=new_node, lineno=new_node.lineno) + for elt in elts + ] + new_node.postinit(new_elts) + return iter((new_node,)) + + +def _looks_like_random_sample(node): + func = node.func + if isinstance(func, astroid.Attribute): + return func.attrname == "sample" + if isinstance(func, astroid.Name): + return func.name == "sample" + return False + + +MANAGER.register_transform( + astroid.Call, astroid.inference_tip(infer_random_sample), _looks_like_random_sample +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_re.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_re.py new file mode 100644 index 0000000..c7ee51a --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_re.py @@ -0,0 +1,36 @@ +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +import sys +import astroid + +PY36 = sys.version_info >= (3, 6) + +if PY36: + # Since Python 3.6 there is the RegexFlag enum + # where every entry will be exposed via updating globals() + + def _re_transform(): + return astroid.parse( + """ + import sre_compile + ASCII = sre_compile.SRE_FLAG_ASCII + IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE + LOCALE = sre_compile.SRE_FLAG_LOCALE + UNICODE = sre_compile.SRE_FLAG_UNICODE + MULTILINE = sre_compile.SRE_FLAG_MULTILINE + DOTALL = sre_compile.SRE_FLAG_DOTALL + VERBOSE = sre_compile.SRE_FLAG_VERBOSE + A = ASCII + I = IGNORECASE + L = LOCALE + U = UNICODE + M = MULTILINE + S = DOTALL + X = VERBOSE + TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE + T = TEMPLATE + DEBUG = sre_compile.SRE_FLAG_DEBUG + """ + ) + + astroid.register_module_extender(astroid.MANAGER, "re", _re_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_six.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_six.py new file mode 100644 index 0000000..b342fbf --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_six.py @@ -0,0 +1,200 @@ +# Copyright (c) 2014-2016, 2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +"""Astroid hooks for six module.""" + +from textwrap import dedent + +from astroid import MANAGER, register_module_extender +from astroid.builder import AstroidBuilder +from astroid.exceptions import ( + AstroidBuildingError, + InferenceError, + AttributeInferenceError, +) +from astroid import nodes + + +SIX_ADD_METACLASS = "six.add_metaclass" + + +def _indent(text, prefix, predicate=None): + """Adds 'prefix' to the beginning of selected lines in 'text'. + + If 'predicate' is provided, 'prefix' will only be added to the lines + where 'predicate(line)' is True. If 'predicate' is not provided, + it will default to adding 'prefix' to all non-empty lines that do not + consist solely of whitespace characters. + """ + if predicate is None: + predicate = lambda line: line.strip() + + def prefixed_lines(): + for line in text.splitlines(True): + yield prefix + line if predicate(line) else line + + return "".join(prefixed_lines()) + + +_IMPORTS = """ +import _io +cStringIO = _io.StringIO +filter = filter +from itertools import filterfalse +input = input +from sys import intern +map = map +range = range +from imp import reload as reload_module +from functools import reduce +from shlex import quote as shlex_quote +from io import StringIO +from collections import UserDict, UserList, UserString +xrange = range +zip = zip +from itertools import zip_longest +import builtins +import configparser +import copyreg +import _dummy_thread +import http.cookiejar as http_cookiejar +import http.cookies as http_cookies +import html.entities as html_entities +import html.parser as html_parser +import http.client as http_client +import http.server as http_server +BaseHTTPServer = CGIHTTPServer = SimpleHTTPServer = http.server +import pickle as cPickle +import queue +import reprlib +import socketserver +import _thread +import winreg +import xmlrpc.server as xmlrpc_server +import xmlrpc.client as xmlrpc_client +import urllib.robotparser as urllib_robotparser +import email.mime.multipart as email_mime_multipart +import email.mime.nonmultipart as email_mime_nonmultipart +import email.mime.text as email_mime_text +import email.mime.base as email_mime_base +import urllib.parse as urllib_parse +import urllib.error as urllib_error +import tkinter +import tkinter.dialog as tkinter_dialog +import tkinter.filedialog as tkinter_filedialog +import tkinter.scrolledtext as tkinter_scrolledtext +import tkinter.simpledialog as tkinder_simpledialog +import tkinter.tix as tkinter_tix +import tkinter.ttk as tkinter_ttk +import tkinter.constants as tkinter_constants +import tkinter.dnd as tkinter_dnd +import tkinter.colorchooser as tkinter_colorchooser +import tkinter.commondialog as tkinter_commondialog +import tkinter.filedialog as tkinter_tkfiledialog +import tkinter.font as tkinter_font +import tkinter.messagebox as tkinter_messagebox +import urllib +import urllib.request as urllib_request +import urllib.robotparser as urllib_robotparser +import urllib.parse as urllib_parse +import urllib.error as urllib_error +""" + + +def six_moves_transform(): + code = dedent( + """ + class Moves(object): + {} + moves = Moves() + """ + ).format(_indent(_IMPORTS, " ")) + module = AstroidBuilder(MANAGER).string_build(code) + module.name = "six.moves" + return module + + +def _six_fail_hook(modname): + """Fix six.moves imports due to the dynamic nature of this + class. + + Construct a pseudo-module which contains all the necessary imports + for six + + :param modname: Name of failed module + :type modname: str + + :return: An astroid module + :rtype: nodes.Module + """ + + attribute_of = modname != "six.moves" and modname.startswith("six.moves") + if modname != "six.moves" and not attribute_of: + raise AstroidBuildingError(modname=modname) + module = AstroidBuilder(MANAGER).string_build(_IMPORTS) + module.name = "six.moves" + if attribute_of: + # Facilitate import of submodules in Moves + start_index = len(module.name) + attribute = modname[start_index:].lstrip(".").replace(".", "_") + try: + import_attr = module.getattr(attribute)[0] + except AttributeInferenceError: + raise AstroidBuildingError(modname=modname) + if isinstance(import_attr, nodes.Import): + submodule = MANAGER.ast_from_module_name(import_attr.names[0][0]) + return submodule + # Let dummy submodule imports pass through + # This will cause an Uninferable result, which is okay + return module + + +def _looks_like_decorated_with_six_add_metaclass(node): + if not node.decorators: + return False + + for decorator in node.decorators.nodes: + if not isinstance(decorator, nodes.Call): + continue + if decorator.func.as_string() == SIX_ADD_METACLASS: + return True + return False + + +def transform_six_add_metaclass(node): + """Check if the given class node is decorated with *six.add_metaclass* + + If so, inject its argument as the metaclass of the underlying class. + """ + if not node.decorators: + return + + for decorator in node.decorators.nodes: + if not isinstance(decorator, nodes.Call): + continue + + try: + func = next(decorator.func.infer()) + except InferenceError: + continue + if func.qname() == SIX_ADD_METACLASS and decorator.args: + metaclass = decorator.args[0] + node._metaclass = metaclass + return node + + +register_module_extender(MANAGER, "six", six_moves_transform) +register_module_extender( + MANAGER, "requests.packages.urllib3.packages.six", six_moves_transform +) +MANAGER.register_failed_import_hook(_six_fail_hook) +MANAGER.register_transform( + nodes.ClassDef, + transform_six_add_metaclass, + _looks_like_decorated_with_six_add_metaclass, +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_ssl.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_ssl.py new file mode 100644 index 0000000..893d8a2 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_ssl.py @@ -0,0 +1,74 @@ +# Copyright (c) 2016 Claudiu Popa +# Copyright (c) 2016 Ceridwen + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for the ssl library.""" + +from astroid import MANAGER, register_module_extender +from astroid.builder import AstroidBuilder +from astroid import nodes +from astroid import parse + + +def ssl_transform(): + return parse( + """ + from _ssl import OPENSSL_VERSION_NUMBER, OPENSSL_VERSION_INFO, OPENSSL_VERSION + from _ssl import _SSLContext, MemoryBIO + from _ssl import ( + SSLError, SSLZeroReturnError, SSLWantReadError, SSLWantWriteError, + SSLSyscallError, SSLEOFError, + ) + from _ssl import CERT_NONE, CERT_OPTIONAL, CERT_REQUIRED + from _ssl import txt2obj as _txt2obj, nid2obj as _nid2obj + from _ssl import RAND_status, RAND_add, RAND_bytes, RAND_pseudo_bytes + try: + from _ssl import RAND_egd + except ImportError: + # LibreSSL does not provide RAND_egd + pass + from _ssl import (OP_ALL, OP_CIPHER_SERVER_PREFERENCE, + OP_NO_COMPRESSION, OP_NO_SSLv2, OP_NO_SSLv3, + OP_NO_TLSv1, OP_NO_TLSv1_1, OP_NO_TLSv1_2, + OP_SINGLE_DH_USE, OP_SINGLE_ECDH_USE) + + from _ssl import (ALERT_DESCRIPTION_ACCESS_DENIED, ALERT_DESCRIPTION_BAD_CERTIFICATE, + ALERT_DESCRIPTION_BAD_CERTIFICATE_HASH_VALUE, + ALERT_DESCRIPTION_BAD_CERTIFICATE_STATUS_RESPONSE, + ALERT_DESCRIPTION_BAD_RECORD_MAC, + ALERT_DESCRIPTION_CERTIFICATE_EXPIRED, + ALERT_DESCRIPTION_CERTIFICATE_REVOKED, + ALERT_DESCRIPTION_CERTIFICATE_UNKNOWN, + ALERT_DESCRIPTION_CERTIFICATE_UNOBTAINABLE, + ALERT_DESCRIPTION_CLOSE_NOTIFY, ALERT_DESCRIPTION_DECODE_ERROR, + ALERT_DESCRIPTION_DECOMPRESSION_FAILURE, + ALERT_DESCRIPTION_DECRYPT_ERROR, + ALERT_DESCRIPTION_HANDSHAKE_FAILURE, + ALERT_DESCRIPTION_ILLEGAL_PARAMETER, + ALERT_DESCRIPTION_INSUFFICIENT_SECURITY, + ALERT_DESCRIPTION_INTERNAL_ERROR, + ALERT_DESCRIPTION_NO_RENEGOTIATION, + ALERT_DESCRIPTION_PROTOCOL_VERSION, + ALERT_DESCRIPTION_RECORD_OVERFLOW, + ALERT_DESCRIPTION_UNEXPECTED_MESSAGE, + ALERT_DESCRIPTION_UNKNOWN_CA, + ALERT_DESCRIPTION_UNKNOWN_PSK_IDENTITY, + ALERT_DESCRIPTION_UNRECOGNIZED_NAME, + ALERT_DESCRIPTION_UNSUPPORTED_CERTIFICATE, + ALERT_DESCRIPTION_UNSUPPORTED_EXTENSION, + ALERT_DESCRIPTION_USER_CANCELLED) + from _ssl import (SSL_ERROR_EOF, SSL_ERROR_INVALID_ERROR_CODE, SSL_ERROR_SSL, + SSL_ERROR_SYSCALL, SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_READ, + SSL_ERROR_WANT_WRITE, SSL_ERROR_WANT_X509_LOOKUP, SSL_ERROR_ZERO_RETURN) + from _ssl import VERIFY_CRL_CHECK_CHAIN, VERIFY_CRL_CHECK_LEAF, VERIFY_DEFAULT, VERIFY_X509_STRICT + from _ssl import HAS_SNI, HAS_ECDH, HAS_NPN, HAS_ALPN + from _ssl import _OPENSSL_API_VERSION + from _ssl import PROTOCOL_SSLv23, PROTOCOL_TLSv1, PROTOCOL_TLSv1_1, PROTOCOL_TLSv1_2 + from _ssl import PROTOCOL_TLS, PROTOCOL_TLS_CLIENT, PROTOCOL_TLS_SERVER + """ + ) + + +register_module_extender(MANAGER, "ssl", ssl_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_subprocess.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_subprocess.py new file mode 100644 index 0000000..6c46c82 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_subprocess.py @@ -0,0 +1,119 @@ +# Copyright (c) 2016-2017 Claudiu Popa +# Copyright (c) 2017 Hugo +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +import sys +import textwrap + +import six + +import astroid + + +PY37 = sys.version_info >= (3, 7) +PY36 = sys.version_info >= (3, 6) +PY34 = sys.version_info >= (3, 4) +PY33 = sys.version_info >= (3, 3) + + +def _subprocess_transform(): + if six.PY3: + communicate = (bytes("string", "ascii"), bytes("string", "ascii")) + communicate_signature = "def communicate(self, input=None, timeout=None)" + if PY37: + init = """ + def __init__(self, args, bufsize=0, executable=None, + stdin=None, stdout=None, stderr=None, + preexec_fn=None, close_fds=False, shell=False, + cwd=None, env=None, universal_newlines=False, + startupinfo=None, creationflags=0, restore_signals=True, + start_new_session=False, pass_fds=(), *, + encoding=None, errors=None, text=None): + pass + """ + elif PY36: + init = """ + def __init__(self, args, bufsize=0, executable=None, + stdin=None, stdout=None, stderr=None, + preexec_fn=None, close_fds=False, shell=False, + cwd=None, env=None, universal_newlines=False, + startupinfo=None, creationflags=0, restore_signals=True, + start_new_session=False, pass_fds=(), *, + encoding=None, errors=None): + pass + """ + else: + init = """ + def __init__(self, args, bufsize=0, executable=None, + stdin=None, stdout=None, stderr=None, + preexec_fn=None, close_fds=False, shell=False, + cwd=None, env=None, universal_newlines=False, + startupinfo=None, creationflags=0, restore_signals=True, + start_new_session=False, pass_fds=()): + pass + """ + else: + communicate = ("string", "string") + communicate_signature = "def communicate(self, input=None)" + init = """ + def __init__(self, args, bufsize=0, executable=None, + stdin=None, stdout=None, stderr=None, + preexec_fn=None, close_fds=False, shell=False, + cwd=None, env=None, universal_newlines=False, + startupinfo=None, creationflags=0): + pass + """ + if PY34: + wait_signature = "def wait(self, timeout=None)" + else: + wait_signature = "def wait(self)" + if six.PY3: + ctx_manager = """ + def __enter__(self): return self + def __exit__(self, *args): pass + """ + else: + ctx_manager = "" + py3_args = "" + if PY33: + py3_args = "args = []" + code = textwrap.dedent( + """ + class Popen(object): + returncode = pid = 0 + stdin = stdout = stderr = file() + %(py3_args)s + + %(communicate_signature)s: + return %(communicate)r + %(wait_signature)s: + return self.returncode + def poll(self): + return self.returncode + def send_signal(self, signal): + pass + def terminate(self): + pass + def kill(self): + pass + %(ctx_manager)s + """ + % { + "communicate": communicate, + "communicate_signature": communicate_signature, + "wait_signature": wait_signature, + "ctx_manager": ctx_manager, + "py3_args": py3_args, + } + ) + + init_lines = textwrap.dedent(init).splitlines() + indented_init = "\n".join(" " * 4 + line for line in init_lines) + code += indented_init + return astroid.parse(code) + + +astroid.register_module_extender(astroid.MANAGER, "subprocess", _subprocess_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_threading.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_threading.py new file mode 100644 index 0000000..77f5bde --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_threading.py @@ -0,0 +1,29 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2016 Claudiu Popa +# Copyright (c) 2017 Łukasz Rogalski + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +import astroid + + +def _thread_transform(): + return astroid.parse( + """ + class lock(object): + def acquire(self, blocking=True, timeout=-1): + pass + def release(self): + pass + def __enter__(self): + return True + def __exit__(self, *args): + pass + + def Lock(): + return lock() + """ + ) + + +astroid.register_module_extender(astroid.MANAGER, "threading", _thread_transform) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_typing.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_typing.py new file mode 100644 index 0000000..9ff7227 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_typing.py @@ -0,0 +1,96 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2017-2018 Claudiu Popa +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2017 David Euresti +# Copyright (c) 2018 Bryce Guinta + +"""Astroid hooks for typing.py support.""" +import typing + +from astroid import ( + MANAGER, + UseInferenceDefault, + extract_node, + inference_tip, + nodes, + InferenceError, +) + + +TYPING_NAMEDTUPLE_BASENAMES = {"NamedTuple", "typing.NamedTuple"} +TYPING_TYPEVARS = {"TypeVar", "NewType"} +TYPING_TYPEVARS_QUALIFIED = {"typing.TypeVar", "typing.NewType"} +TYPING_TYPE_TEMPLATE = """ +class Meta(type): + def __getitem__(self, item): + return self + + @property + def __args__(self): + return () + +class {0}(metaclass=Meta): + pass +""" +TYPING_MEMBERS = set(typing.__all__) + + +def looks_like_typing_typevar_or_newtype(node): + func = node.func + if isinstance(func, nodes.Attribute): + return func.attrname in TYPING_TYPEVARS + if isinstance(func, nodes.Name): + return func.name in TYPING_TYPEVARS + return False + + +def infer_typing_typevar_or_newtype(node, context=None): + """Infer a typing.TypeVar(...) or typing.NewType(...) call""" + try: + func = next(node.func.infer(context=context)) + except InferenceError as exc: + raise UseInferenceDefault from exc + + if func.qname() not in TYPING_TYPEVARS_QUALIFIED: + raise UseInferenceDefault + if not node.args: + raise UseInferenceDefault + + typename = node.args[0].as_string().strip("'") + node = extract_node(TYPING_TYPE_TEMPLATE.format(typename)) + return node.infer(context=context) + + +def _looks_like_typing_subscript(node): + """Try to figure out if a Subscript node *might* be a typing-related subscript""" + if isinstance(node, nodes.Name): + return node.name in TYPING_MEMBERS + elif isinstance(node, nodes.Attribute): + return node.attrname in TYPING_MEMBERS + elif isinstance(node, nodes.Subscript): + return _looks_like_typing_subscript(node.value) + return False + + +def infer_typing_attr(node, context=None): + """Infer a typing.X[...] subscript""" + try: + value = next(node.value.infer()) + except InferenceError as exc: + raise UseInferenceDefault from exc + + if not value.qname().startswith("typing."): + raise UseInferenceDefault + + node = extract_node(TYPING_TYPE_TEMPLATE.format(value.qname().split(".")[-1])) + return node.infer(context=context) + + +MANAGER.register_transform( + nodes.Call, + inference_tip(infer_typing_typevar_or_newtype), + looks_like_typing_typevar_or_newtype, +) +MANAGER.register_transform( + nodes.Subscript, inference_tip(infer_typing_attr), _looks_like_typing_subscript +) diff --git a/venv/lib/python3.7/site-packages/astroid/brain/brain_uuid.py b/venv/lib/python3.7/site-packages/astroid/brain/brain_uuid.py new file mode 100644 index 0000000..8bda631 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/brain/brain_uuid.py @@ -0,0 +1,20 @@ +# Copyright (c) 2017 Claudiu Popa + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Astroid hooks for the UUID module.""" + + +from astroid import MANAGER +from astroid import nodes + + +def _patch_uuid_class(node): + # The .int member is patched using __dict__ + node.locals["int"] = [nodes.Const(0, parent=node)] + + +MANAGER.register_transform( + nodes.ClassDef, _patch_uuid_class, lambda node: node.qname() == "uuid.UUID" +) diff --git a/venv/lib/python3.7/site-packages/astroid/builder.py b/venv/lib/python3.7/site-packages/astroid/builder.py new file mode 100644 index 0000000..ac71093 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/builder.py @@ -0,0 +1,435 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2006-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2013 Phil Schaf +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014-2015 Google, Inc. +# Copyright (c) 2014 Alexander Presnyakov +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2018 Anthony Sottile + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""The AstroidBuilder makes astroid from living object and / or from _ast + +The builder is not thread safe and can't be used to parse different sources +at the same time. +""" + +import os +import textwrap +from tokenize import detect_encoding + +from astroid._ast import _parse +from astroid import bases +from astroid import exceptions +from astroid import manager +from astroid import modutils +from astroid import raw_building +from astroid import rebuilder +from astroid import nodes +from astroid import util + +# The name of the transient function that is used to +# wrap expressions to be extracted when calling +# extract_node. +_TRANSIENT_FUNCTION = "__" + +# The comment used to select a statement to be extracted +# when calling extract_node. +_STATEMENT_SELECTOR = "#@" + +MANAGER = manager.AstroidManager() + + +def open_source_file(filename): + with open(filename, "rb") as byte_stream: + encoding = detect_encoding(byte_stream.readline)[0] + stream = open(filename, "r", newline=None, encoding=encoding) + data = stream.read() + return stream, encoding, data + + +def _can_assign_attr(node, attrname): + try: + slots = node.slots() + except NotImplementedError: + pass + else: + if slots and attrname not in {slot.value for slot in slots}: + return False + return True + + +class AstroidBuilder(raw_building.InspectBuilder): + """Class for building an astroid tree from source code or from a live module. + + The param *manager* specifies the manager class which should be used. + If no manager is given, then the default one will be used. The + param *apply_transforms* determines if the transforms should be + applied after the tree was built from source or from a live object, + by default being True. + """ + + # pylint: disable=redefined-outer-name + def __init__(self, manager=None, apply_transforms=True): + super(AstroidBuilder, self).__init__() + self._manager = manager or MANAGER + self._apply_transforms = apply_transforms + + def module_build(self, module, modname=None): + """Build an astroid from a living module instance.""" + node = None + path = getattr(module, "__file__", None) + if path is not None: + path_, ext = os.path.splitext(modutils._path_from_filename(path)) + if ext in (".py", ".pyc", ".pyo") and os.path.exists(path_ + ".py"): + node = self.file_build(path_ + ".py", modname) + if node is None: + # this is a built-in module + # get a partial representation by introspection + node = self.inspect_build(module, modname=modname, path=path) + if self._apply_transforms: + # We have to handle transformation by ourselves since the + # rebuilder isn't called for builtin nodes + node = self._manager.visit_transforms(node) + return node + + def file_build(self, path, modname=None): + """Build astroid from a source code file (i.e. from an ast) + + *path* is expected to be a python source file + """ + try: + stream, encoding, data = open_source_file(path) + except IOError as exc: + raise exceptions.AstroidBuildingError( + "Unable to load file {path}:\n{error}", + modname=modname, + path=path, + error=exc, + ) from exc + except (SyntaxError, LookupError) as exc: + raise exceptions.AstroidSyntaxError( + "Python 3 encoding specification error or unknown encoding:\n" + "{error}", + modname=modname, + path=path, + error=exc, + ) from exc + except UnicodeError as exc: # wrong encoding + # detect_encoding returns utf-8 if no encoding specified + raise exceptions.AstroidBuildingError( + "Wrong or no encoding specified for {filename}.", filename=path + ) from exc + with stream: + # get module name if necessary + if modname is None: + try: + modname = ".".join(modutils.modpath_from_file(path)) + except ImportError: + modname = os.path.splitext(os.path.basename(path))[0] + # build astroid representation + module = self._data_build(data, modname, path) + return self._post_build(module, encoding) + + def string_build(self, data, modname="", path=None): + """Build astroid from source code string.""" + module = self._data_build(data, modname, path) + module.file_bytes = data.encode("utf-8") + return self._post_build(module, "utf-8") + + def _post_build(self, module, encoding): + """Handles encoding and delayed nodes after a module has been built""" + module.file_encoding = encoding + self._manager.cache_module(module) + # post tree building steps after we stored the module in the cache: + for from_node in module._import_from_nodes: + if from_node.modname == "__future__": + for symbol, _ in from_node.names: + module.future_imports.add(symbol) + self.add_from_names_to_locals(from_node) + # handle delayed assattr nodes + for delayed in module._delayed_assattr: + self.delayed_assattr(delayed) + + # Visit the transforms + if self._apply_transforms: + module = self._manager.visit_transforms(module) + return module + + def _data_build(self, data, modname, path): + """Build tree node from data and add some informations""" + try: + node = _parse(data + "\n") + except (TypeError, ValueError, SyntaxError) as exc: + raise exceptions.AstroidSyntaxError( + "Parsing Python code failed:\n{error}", + source=data, + modname=modname, + path=path, + error=exc, + ) from exc + if path is not None: + node_file = os.path.abspath(path) + else: + node_file = "" + if modname.endswith(".__init__"): + modname = modname[:-9] + package = True + else: + package = ( + path is not None + and os.path.splitext(os.path.basename(path))[0] == "__init__" + ) + builder = rebuilder.TreeRebuilder(self._manager) + module = builder.visit_module(node, modname, node_file, package) + module._import_from_nodes = builder._import_from_nodes + module._delayed_assattr = builder._delayed_assattr + return module + + def add_from_names_to_locals(self, node): + """Store imported names to the locals + + Resort the locals if coming from a delayed node + """ + _key_func = lambda node: node.fromlineno + + def sort_locals(my_list): + my_list.sort(key=_key_func) + + for (name, asname) in node.names: + if name == "*": + try: + imported = node.do_import_module() + except exceptions.AstroidBuildingError: + continue + for name in imported.public_names(): + node.parent.set_local(name, node) + sort_locals(node.parent.scope().locals[name]) + else: + node.parent.set_local(asname or name, node) + sort_locals(node.parent.scope().locals[asname or name]) + + def delayed_assattr(self, node): + """Visit a AssAttr node + + This adds name to locals and handle members definition. + """ + try: + frame = node.frame() + for inferred in node.expr.infer(): + if inferred is util.Uninferable: + continue + try: + if inferred.__class__ is bases.Instance: + inferred = inferred._proxied + iattrs = inferred.instance_attrs + if not _can_assign_attr(inferred, node.attrname): + continue + elif isinstance(inferred, bases.Instance): + # Const, Tuple, ... we may be wrong, may be not, but + # anyway we don't want to pollute builtin's namespace + continue + elif inferred.is_function: + iattrs = inferred.instance_attrs + else: + iattrs = inferred.locals + except AttributeError: + # XXX log error + continue + values = iattrs.setdefault(node.attrname, []) + if node in values: + continue + # get assign in __init__ first XXX useful ? + if ( + frame.name == "__init__" + and values + and values[0].frame().name != "__init__" + ): + values.insert(0, node) + else: + values.append(node) + except exceptions.InferenceError: + pass + + +def build_namespace_package_module(name, path): + return nodes.Module(name, doc="", path=path, package=True) + + +def parse(code, module_name="", path=None, apply_transforms=True): + """Parses a source string in order to obtain an astroid AST from it + + :param str code: The code for the module. + :param str module_name: The name for the module, if any + :param str path: The path for the module + :param bool apply_transforms: + Apply the transforms for the give code. Use it if you + don't want the default transforms to be applied. + """ + code = textwrap.dedent(code) + builder = AstroidBuilder(manager=MANAGER, apply_transforms=apply_transforms) + return builder.string_build(code, modname=module_name, path=path) + + +def _extract_expressions(node): + """Find expressions in a call to _TRANSIENT_FUNCTION and extract them. + + The function walks the AST recursively to search for expressions that + are wrapped into a call to _TRANSIENT_FUNCTION. If it finds such an + expression, it completely removes the function call node from the tree, + replacing it by the wrapped expression inside the parent. + + :param node: An astroid node. + :type node: astroid.bases.NodeNG + :yields: The sequence of wrapped expressions on the modified tree + expression can be found. + """ + if ( + isinstance(node, nodes.Call) + and isinstance(node.func, nodes.Name) + and node.func.name == _TRANSIENT_FUNCTION + ): + real_expr = node.args[0] + real_expr.parent = node.parent + # Search for node in all _astng_fields (the fields checked when + # get_children is called) of its parent. Some of those fields may + # be lists or tuples, in which case the elements need to be checked. + # When we find it, replace it by real_expr, so that the AST looks + # like no call to _TRANSIENT_FUNCTION ever took place. + for name in node.parent._astroid_fields: + child = getattr(node.parent, name) + if isinstance(child, (list, tuple)): + for idx, compound_child in enumerate(child): + if compound_child is node: + child[idx] = real_expr + elif child is node: + setattr(node.parent, name, real_expr) + yield real_expr + else: + for child in node.get_children(): + yield from _extract_expressions(child) + + +def _find_statement_by_line(node, line): + """Extracts the statement on a specific line from an AST. + + If the line number of node matches line, it will be returned; + otherwise its children are iterated and the function is called + recursively. + + :param node: An astroid node. + :type node: astroid.bases.NodeNG + :param line: The line number of the statement to extract. + :type line: int + :returns: The statement on the line, or None if no statement for the line + can be found. + :rtype: astroid.bases.NodeNG or None + """ + if isinstance(node, (nodes.ClassDef, nodes.FunctionDef)): + # This is an inaccuracy in the AST: the nodes that can be + # decorated do not carry explicit information on which line + # the actual definition (class/def), but .fromline seems to + # be close enough. + node_line = node.fromlineno + else: + node_line = node.lineno + + if node_line == line: + return node + + for child in node.get_children(): + result = _find_statement_by_line(child, line) + if result: + return result + + return None + + +def extract_node(code, module_name=""): + """Parses some Python code as a module and extracts a designated AST node. + + Statements: + To extract one or more statement nodes, append #@ to the end of the line + + Examples: + >>> def x(): + >>> def y(): + >>> return 1 #@ + + The return statement will be extracted. + + >>> class X(object): + >>> def meth(self): #@ + >>> pass + + The function object 'meth' will be extracted. + + Expressions: + To extract arbitrary expressions, surround them with the fake + function call __(...). After parsing, the surrounded expression + will be returned and the whole AST (accessible via the returned + node's parent attribute) will look like the function call was + never there in the first place. + + Examples: + >>> a = __(1) + + The const node will be extracted. + + >>> def x(d=__(foo.bar)): pass + + The node containing the default argument will be extracted. + + >>> def foo(a, b): + >>> return 0 < __(len(a)) < b + + The node containing the function call 'len' will be extracted. + + If no statements or expressions are selected, the last toplevel + statement will be returned. + + If the selected statement is a discard statement, (i.e. an expression + turned into a statement), the wrapped expression is returned instead. + + For convenience, singleton lists are unpacked. + + :param str code: A piece of Python code that is parsed as + a module. Will be passed through textwrap.dedent first. + :param str module_name: The name of the module. + :returns: The designated node from the parse tree, or a list of nodes. + :rtype: astroid.bases.NodeNG, or a list of nodes. + """ + + def _extract(node): + if isinstance(node, nodes.Expr): + return node.value + + return node + + requested_lines = [] + for idx, line in enumerate(code.splitlines()): + if line.strip().endswith(_STATEMENT_SELECTOR): + requested_lines.append(idx + 1) + + tree = parse(code, module_name=module_name) + if not tree.body: + raise ValueError("Empty tree, cannot extract from it") + + extracted = [] + if requested_lines: + extracted = [_find_statement_by_line(tree, line) for line in requested_lines] + + # Modifies the tree. + extracted.extend(_extract_expressions(tree)) + + if not extracted: + extracted.append(tree.body[-1]) + + extracted = [_extract(node) for node in extracted] + if len(extracted) == 1: + return extracted[0] + return extracted diff --git a/venv/lib/python3.7/site-packages/astroid/context.py b/venv/lib/python3.7/site-packages/astroid/context.py new file mode 100644 index 0000000..70a9208 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/context.py @@ -0,0 +1,179 @@ +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 Nick Drozd + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Various context related utilities, including inference and call contexts.""" +import contextlib +import pprint +from typing import Optional + + +class InferenceContext: + """Provide context for inference + + Store already inferred nodes to save time + Account for already visited nodes to infinite stop infinite recursion + """ + + __slots__ = ( + "path", + "lookupname", + "callcontext", + "boundnode", + "inferred", + "extra_context", + ) + + def __init__(self, path=None, inferred=None): + self.path = path or set() + """ + :type: set(tuple(NodeNG, optional(str))) + + Path of visited nodes and their lookupname + + Currently this key is ``(node, context.lookupname)`` + """ + self.lookupname = None + """ + :type: optional[str] + + The original name of the node + + e.g. + foo = 1 + The inference of 'foo' is nodes.Const(1) but the lookup name is 'foo' + """ + self.callcontext = None + """ + :type: optional[CallContext] + + The call arguments and keywords for the given context + """ + self.boundnode = None + """ + :type: optional[NodeNG] + + The bound node of the given context + + e.g. the bound node of object.__new__(cls) is the object node + """ + self.inferred = inferred or {} + """ + :type: dict(seq, seq) + + Inferred node contexts to their mapped results + Currently the key is ``(node, lookupname, callcontext, boundnode)`` + and the value is tuple of the inferred results + """ + self.extra_context = {} + """ + :type: dict(NodeNG, Context) + + Context that needs to be passed down through call stacks + for call arguments + """ + + def push(self, node): + """Push node into inference path + + :return: True if node is already in context path else False + :rtype: bool + + Allows one to see if the given node has already + been looked at for this inference context""" + name = self.lookupname + if (node, name) in self.path: + return True + + self.path.add((node, name)) + return False + + def clone(self): + """Clone inference path + + For example, each side of a binary operation (BinOp) + starts with the same context but diverge as each side is inferred + so the InferenceContext will need be cloned""" + # XXX copy lookupname/callcontext ? + clone = InferenceContext(self.path, inferred=self.inferred) + clone.callcontext = self.callcontext + clone.boundnode = self.boundnode + clone.extra_context = self.extra_context + return clone + + def cache_generator(self, key, generator): + """Cache result of generator into dictionary + + Used to cache inference results""" + results = [] + for result in generator: + results.append(result) + yield result + + self.inferred[key] = tuple(results) + + @contextlib.contextmanager + def restore_path(self): + path = set(self.path) + yield + self.path = path + + def __str__(self): + state = ( + "%s=%s" + % (field, pprint.pformat(getattr(self, field), width=80 - len(field))) + for field in self.__slots__ + ) + return "%s(%s)" % (type(self).__name__, ",\n ".join(state)) + + +class CallContext: + """Holds information for a call site.""" + + __slots__ = ("args", "keywords") + + def __init__(self, args, keywords=None): + """ + :param List[NodeNG] args: Call positional arguments + :param Union[List[nodes.Keyword], None] keywords: Call keywords + """ + self.args = args + if keywords: + keywords = [(arg.arg, arg.value) for arg in keywords] + else: + keywords = [] + self.keywords = keywords + + +def copy_context(context: Optional[InferenceContext]) -> InferenceContext: + """Clone a context if given, or return a fresh contexxt""" + if context is not None: + return context.clone() + + return InferenceContext() + + +def bind_context_to_node(context, node): + """Give a context a boundnode + to retrieve the correct function name or attribute value + with from further inference. + + Do not use an existing context since the boundnode could then + be incorrectly propagated higher up in the call stack. + + :param context: Context to use + :type context: Optional(context) + + :param node: Node to do name lookups from + :type node NodeNG: + + :returns: A new context + :rtype: InferenceContext + """ + context = copy_context(context) + context.boundnode = node + return context diff --git a/venv/lib/python3.7/site-packages/astroid/decorators.py b/venv/lib/python3.7/site-packages/astroid/decorators.py new file mode 100644 index 0000000..1448757 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/decorators.py @@ -0,0 +1,141 @@ +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 Ashley Whetter +# Copyright (c) 2018 HoverHell +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +""" A few useful function/method decorators.""" + +import functools + +import wrapt + +from astroid import context as contextmod +from astroid import exceptions +from astroid import util + + +@wrapt.decorator +def cached(func, instance, args, kwargs): + """Simple decorator to cache result of method calls without args.""" + cache = getattr(instance, "__cache", None) + if cache is None: + instance.__cache = cache = {} + try: + return cache[func] + except KeyError: + cache[func] = result = func(*args, **kwargs) + return result + + +class cachedproperty: + """ Provides a cached property equivalent to the stacking of + @cached and @property, but more efficient. + + After first usage, the becomes part of the object's + __dict__. Doing: + + del obj. empties the cache. + + Idea taken from the pyramid_ framework and the mercurial_ project. + + .. _pyramid: http://pypi.python.org/pypi/pyramid + .. _mercurial: http://pypi.python.org/pypi/Mercurial + """ + + __slots__ = ("wrapped",) + + def __init__(self, wrapped): + try: + wrapped.__name__ + except AttributeError as exc: + raise TypeError("%s must have a __name__ attribute" % wrapped) from exc + self.wrapped = wrapped + + @property + def __doc__(self): + doc = getattr(self.wrapped, "__doc__", None) + return "%s" % ( + "\n%s" % doc if doc else "" + ) + + def __get__(self, inst, objtype=None): + if inst is None: + return self + val = self.wrapped(inst) + setattr(inst, self.wrapped.__name__, val) + return val + + +def path_wrapper(func): + """return the given infer function wrapped to handle the path + + Used to stop inference if the node has already been looked + at for a given `InferenceContext` to prevent infinite recursion + """ + + @functools.wraps(func) + def wrapped(node, context=None, _func=func, **kwargs): + """wrapper function handling context""" + if context is None: + context = contextmod.InferenceContext() + if context.push(node): + return None + + yielded = set() + generator = _func(node, context, **kwargs) + try: + while True: + res = next(generator) + # unproxy only true instance, not const, tuple, dict... + if res.__class__.__name__ == "Instance": + ares = res._proxied + else: + ares = res + if ares not in yielded: + yield res + yielded.add(ares) + except StopIteration as error: + if error.args: + return error.args[0] + return None + + return wrapped + + +@wrapt.decorator +def yes_if_nothing_inferred(func, instance, args, kwargs): + generator = func(*args, **kwargs) + + try: + yield next(generator) + except StopIteration: + # generator is empty + yield util.Uninferable + return + + yield from generator + + +@wrapt.decorator +def raise_if_nothing_inferred(func, instance, args, kwargs): + generator = func(*args, **kwargs) + + try: + yield next(generator) + except StopIteration as error: + # generator is empty + if error.args: + # pylint: disable=not-a-mapping + raise exceptions.InferenceError(**error.args[0]) + raise exceptions.InferenceError( + "StopIteration raised without any error information." + ) + + yield from generator diff --git a/venv/lib/python3.7/site-packages/astroid/exceptions.py b/venv/lib/python3.7/site-packages/astroid/exceptions.py new file mode 100644 index 0000000..7e9d655 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/exceptions.py @@ -0,0 +1,230 @@ +# Copyright (c) 2007, 2009-2010, 2013 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2015-2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""this module contains exceptions used in the astroid library +""" +from astroid import util + + +class AstroidError(Exception): + """base exception class for all astroid related exceptions + + AstroidError and its subclasses are structured, intended to hold + objects representing state when the exception is thrown. Field + values are passed to the constructor as keyword-only arguments. + Each subclass has its own set of standard fields, but use your + best judgment to decide whether a specific exception instance + needs more or fewer fields for debugging. Field values may be + used to lazily generate the error message: self.message.format() + will be called with the field names and values supplied as keyword + arguments. + """ + + def __init__(self, message="", **kws): + super(AstroidError, self).__init__(message) + self.message = message + for key, value in kws.items(): + setattr(self, key, value) + + def __str__(self): + return self.message.format(**vars(self)) + + +class AstroidBuildingError(AstroidError): + """exception class when we are unable to build an astroid representation + + Standard attributes: + modname: Name of the module that AST construction failed for. + error: Exception raised during construction. + """ + + def __init__(self, message="Failed to import module {modname}.", **kws): + super(AstroidBuildingError, self).__init__(message, **kws) + + +class AstroidImportError(AstroidBuildingError): + """Exception class used when a module can't be imported by astroid.""" + + +class TooManyLevelsError(AstroidImportError): + """Exception class which is raised when a relative import was beyond the top-level. + + Standard attributes: + level: The level which was attempted. + name: the name of the module on which the relative import was attempted. + """ + + level = None + name = None + + def __init__( + self, + message="Relative import with too many levels " "({level}) for module {name!r}", + **kws + ): + super(TooManyLevelsError, self).__init__(message, **kws) + + +class AstroidSyntaxError(AstroidBuildingError): + """Exception class used when a module can't be parsed.""" + + +class NoDefault(AstroidError): + """raised by function's `default_value` method when an argument has + no default value + + Standard attributes: + func: Function node. + name: Name of argument without a default. + """ + + func = None + name = None + + def __init__(self, message="{func!r} has no default for {name!r}.", **kws): + super(NoDefault, self).__init__(message, **kws) + + +class ResolveError(AstroidError): + """Base class of astroid resolution/inference error. + + ResolveError is not intended to be raised. + + Standard attributes: + context: InferenceContext object. + """ + + context = None + + +class MroError(ResolveError): + """Error raised when there is a problem with method resolution of a class. + + Standard attributes: + mros: A sequence of sequences containing ClassDef nodes. + cls: ClassDef node whose MRO resolution failed. + context: InferenceContext object. + """ + + mros = () + cls = None + + def __str__(self): + mro_names = ", ".join( + "({})".format(", ".join(b.name for b in m)) for m in self.mros + ) + return self.message.format(mros=mro_names, cls=self.cls) + + +class DuplicateBasesError(MroError): + """Error raised when there are duplicate bases in the same class bases.""" + + +class InconsistentMroError(MroError): + """Error raised when a class's MRO is inconsistent.""" + + +class SuperError(ResolveError): + """Error raised when there is a problem with a *super* call. + + Standard attributes: + *super_*: The Super instance that raised the exception. + context: InferenceContext object. + """ + + super_ = None + + def __str__(self): + return self.message.format(**vars(self.super_)) + + +class InferenceError(ResolveError): + """raised when we are unable to infer a node + + Standard attributes: + node: The node inference was called on. + context: InferenceContext object. + """ + + node = None + context = None + + def __init__(self, message="Inference failed for {node!r}.", **kws): + super(InferenceError, self).__init__(message, **kws) + + +# Why does this inherit from InferenceError rather than ResolveError? +# Changing it causes some inference tests to fail. +class NameInferenceError(InferenceError): + """Raised when a name lookup fails, corresponds to NameError. + + Standard attributes: + name: The name for which lookup failed, as a string. + scope: The node representing the scope in which the lookup occurred. + context: InferenceContext object. + """ + + name = None + scope = None + + def __init__(self, message="{name!r} not found in {scope!r}.", **kws): + super(NameInferenceError, self).__init__(message, **kws) + + +class AttributeInferenceError(ResolveError): + """Raised when an attribute lookup fails, corresponds to AttributeError. + + Standard attributes: + target: The node for which lookup failed. + attribute: The attribute for which lookup failed, as a string. + context: InferenceContext object. + """ + + target = None + attribute = None + + def __init__(self, message="{attribute!r} not found on {target!r}.", **kws): + super(AttributeInferenceError, self).__init__(message, **kws) + + +class UseInferenceDefault(Exception): + """exception to be raised in custom inference function to indicate that it + should go back to the default behaviour + """ + + +class _NonDeducibleTypeHierarchy(Exception): + """Raised when is_subtype / is_supertype can't deduce the relation between two types.""" + + +class AstroidIndexError(AstroidError): + """Raised when an Indexable / Mapping does not have an index / key.""" + + +class AstroidTypeError(AstroidError): + """Raised when a TypeError would be expected in Python code.""" + + +class InferenceOverwriteError(AstroidError): + """Raised when an inference tip is overwritten + + Currently only used for debugging. + """ + + +# Backwards-compatibility aliases +OperationError = util.BadOperationMessage +UnaryOperationError = util.BadUnaryOperationMessage +BinaryOperationError = util.BadBinaryOperationMessage + +SuperArgumentTypeError = SuperError +UnresolvableName = NameInferenceError +NotFoundError = AttributeInferenceError +AstroidBuildingException = AstroidBuildingError diff --git a/venv/lib/python3.7/site-packages/astroid/helpers.py b/venv/lib/python3.7/site-packages/astroid/helpers.py new file mode 100644 index 0000000..edbb205 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/helpers.py @@ -0,0 +1,272 @@ +# Copyright (c) 2015-2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +""" +Various helper utilities. +""" + +import builtins as builtins_mod + +from astroid import bases +from astroid import context as contextmod +from astroid import exceptions +from astroid import manager +from astroid import nodes +from astroid import raw_building +from astroid import scoped_nodes +from astroid import util + + +BUILTINS = builtins_mod.__name__ + + +def _build_proxy_class(cls_name, builtins): + proxy = raw_building.build_class(cls_name) + proxy.parent = builtins + return proxy + + +def _function_type(function, builtins): + if isinstance(function, scoped_nodes.Lambda): + if function.root().name == BUILTINS: + cls_name = "builtin_function_or_method" + else: + cls_name = "function" + elif isinstance(function, bases.BoundMethod): + cls_name = "method" + elif isinstance(function, bases.UnboundMethod): + cls_name = "function" + return _build_proxy_class(cls_name, builtins) + + +def _object_type(node, context=None): + astroid_manager = manager.AstroidManager() + builtins = astroid_manager.builtins_module + context = context or contextmod.InferenceContext() + + for inferred in node.infer(context=context): + if isinstance(inferred, scoped_nodes.ClassDef): + if inferred.newstyle: + metaclass = inferred.metaclass() + if metaclass: + yield metaclass + continue + yield builtins.getattr("type")[0] + elif isinstance(inferred, (scoped_nodes.Lambda, bases.UnboundMethod)): + yield _function_type(inferred, builtins) + elif isinstance(inferred, scoped_nodes.Module): + yield _build_proxy_class("module", builtins) + else: + yield inferred._proxied + + +def object_type(node, context=None): + """Obtain the type of the given node + + This is used to implement the ``type`` builtin, which means that it's + used for inferring type calls, as well as used in a couple of other places + in the inference. + The node will be inferred first, so this function can support all + sorts of objects, as long as they support inference. + """ + + try: + types = set(_object_type(node, context)) + except exceptions.InferenceError: + return util.Uninferable + if len(types) > 1 or not types: + return util.Uninferable + return list(types)[0] + + +def _object_type_is_subclass(obj_type, class_or_seq, context=None): + if not isinstance(class_or_seq, (tuple, list)): + class_seq = (class_or_seq,) + else: + class_seq = class_or_seq + + if obj_type is util.Uninferable: + return util.Uninferable + + # Instances are not types + class_seq = [ + item if not isinstance(item, bases.Instance) else util.Uninferable + for item in class_seq + ] + # strict compatibility with issubclass + # issubclass(type, (object, 1)) evaluates to true + # issubclass(object, (1, type)) raises TypeError + for klass in class_seq: + if klass is util.Uninferable: + raise exceptions.AstroidTypeError("arg 2 must be a type or tuple of types") + + for obj_subclass in obj_type.mro(): + if obj_subclass == klass: + return True + return False + + +def object_isinstance(node, class_or_seq, context=None): + """Check if a node 'isinstance' any node in class_or_seq + + :param node: A given node + :param class_or_seq: Union[nodes.NodeNG, Sequence[nodes.NodeNG]] + :rtype: bool + + :raises AstroidTypeError: if the given ``classes_or_seq`` are not types + """ + obj_type = object_type(node, context) + if obj_type is util.Uninferable: + return util.Uninferable + return _object_type_is_subclass(obj_type, class_or_seq, context=context) + + +def object_issubclass(node, class_or_seq, context=None): + """Check if a type is a subclass of any node in class_or_seq + + :param node: A given node + :param class_or_seq: Union[Nodes.NodeNG, Sequence[nodes.NodeNG]] + :rtype: bool + + :raises AstroidTypeError: if the given ``classes_or_seq`` are not types + :raises AstroidError: if the type of the given node cannot be inferred + or its type's mro doesn't work + """ + if not isinstance(node, nodes.ClassDef): + raise TypeError("{node} needs to be a ClassDef node".format(node=node)) + return _object_type_is_subclass(node, class_or_seq, context=context) + + +def safe_infer(node, context=None): + """Return the inferred value for the given node. + + Return None if inference failed or if there is some ambiguity (more than + one node has been inferred). + """ + try: + inferit = node.infer(context=context) + value = next(inferit) + except exceptions.InferenceError: + return None + try: + next(inferit) + return None # None if there is ambiguity on the inferred node + except exceptions.InferenceError: + return None # there is some kind of ambiguity + except StopIteration: + return value + + +def has_known_bases(klass, context=None): + """Return true if all base classes of a class could be inferred.""" + try: + return klass._all_bases_known + except AttributeError: + pass + for base in klass.bases: + result = safe_infer(base, context=context) + # TODO: check for A->B->A->B pattern in class structure too? + if ( + not isinstance(result, scoped_nodes.ClassDef) + or result is klass + or not has_known_bases(result, context=context) + ): + klass._all_bases_known = False + return False + klass._all_bases_known = True + return True + + +def _type_check(type1, type2): + if not all(map(has_known_bases, (type1, type2))): + raise exceptions._NonDeducibleTypeHierarchy + + if not all([type1.newstyle, type2.newstyle]): + return False + try: + return type1 in type2.mro()[:-1] + except exceptions.MroError: + # The MRO is invalid. + raise exceptions._NonDeducibleTypeHierarchy + + +def is_subtype(type1, type2): + """Check if *type1* is a subtype of *typ2*.""" + return _type_check(type2, type1) + + +def is_supertype(type1, type2): + """Check if *type2* is a supertype of *type1*.""" + return _type_check(type1, type2) + + +def class_instance_as_index(node): + """Get the value as an index for the given instance. + + If an instance provides an __index__ method, then it can + be used in some scenarios where an integer is expected, + for instance when multiplying or subscripting a list. + """ + context = contextmod.InferenceContext() + context.callcontext = contextmod.CallContext(args=[node]) + + try: + for inferred in node.igetattr("__index__", context=context): + if not isinstance(inferred, bases.BoundMethod): + continue + + for result in inferred.infer_call_result(node, context=context): + if isinstance(result, nodes.Const) and isinstance(result.value, int): + return result + except exceptions.InferenceError: + pass + return None + + +def object_len(node, context=None): + """Infer length of given node object + + :param Union[nodes.ClassDef, nodes.Instance] node: + :param node: Node to infer length of + + :raises AstroidTypeError: If an invalid node is returned + from __len__ method or no __len__ method exists + :raises InferenceError: If the given node cannot be inferred + or if multiple nodes are inferred + :rtype int: Integer length of node + """ + from astroid.objects import FrozenSet + + inferred_node = safe_infer(node, context=context) + if inferred_node is None or inferred_node is util.Uninferable: + raise exceptions.InferenceError(node=node) + if isinstance(inferred_node, nodes.Const) and isinstance( + inferred_node.value, (bytes, str) + ): + return len(inferred_node.value) + if isinstance(inferred_node, (nodes.List, nodes.Set, nodes.Tuple, FrozenSet)): + return len(inferred_node.elts) + if isinstance(inferred_node, nodes.Dict): + return len(inferred_node.items) + try: + node_type = object_type(inferred_node, context=context) + len_call = next(node_type.igetattr("__len__", context=context)) + except exceptions.AttributeInferenceError: + raise exceptions.AstroidTypeError( + "object of type '{}' has no len()".format(len_call.pytype()) + ) + + result_of_len = next(len_call.infer_call_result(node, context)) + if ( + isinstance(result_of_len, nodes.Const) + and result_of_len.pytype() == "builtins.int" + ): + return result_of_len.value + raise exceptions.AstroidTypeError( + "'{}' object cannot be interpreted as an integer".format(result_of_len) + ) diff --git a/venv/lib/python3.7/site-packages/astroid/inference.py b/venv/lib/python3.7/site-packages/astroid/inference.py new file mode 100644 index 0000000..16346a7 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/inference.py @@ -0,0 +1,899 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2006-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2012 FELD Boris +# Copyright (c) 2013-2014 Google, Inc. +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Dmitry Pribysh +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2017 Michał Masłowski +# Copyright (c) 2017 Calen Pennington +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 Ashley Whetter +# Copyright (c) 2018 HoverHell + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""this module contains a set of functions to handle inference on astroid trees +""" + +import functools +import itertools +import operator + +from astroid import bases +from astroid import context as contextmod +from astroid import exceptions +from astroid import decorators +from astroid import helpers +from astroid import manager +from astroid import nodes +from astroid.interpreter import dunder_lookup +from astroid import protocols +from astroid import util + + +MANAGER = manager.AstroidManager() + + +# .infer method ############################################################### + + +def infer_end(self, context=None): + """inference's end for node such as Module, ClassDef, FunctionDef, + Const... + + """ + yield self + + +nodes.Module._infer = infer_end +nodes.ClassDef._infer = infer_end +nodes.FunctionDef._infer = infer_end +nodes.Lambda._infer = infer_end +nodes.Const._infer = infer_end +nodes.Slice._infer = infer_end + + +def _infer_sequence_helper(node, context=None): + """Infer all values based on _BaseContainer.elts""" + values = [] + + for elt in node.elts: + if isinstance(elt, nodes.Starred): + starred = helpers.safe_infer(elt.value, context) + if not starred: + raise exceptions.InferenceError(node=node, context=context) + if not hasattr(starred, "elts"): + raise exceptions.InferenceError(node=node, context=context) + values.extend(_infer_sequence_helper(starred)) + else: + values.append(elt) + return values + + +@decorators.raise_if_nothing_inferred +def infer_sequence(self, context=None): + if not any(isinstance(e, nodes.Starred) for e in self.elts): + yield self + else: + values = _infer_sequence_helper(self, context) + new_seq = type(self)( + lineno=self.lineno, col_offset=self.col_offset, parent=self.parent + ) + new_seq.postinit(values) + + yield new_seq + + +nodes.List._infer = infer_sequence +nodes.Tuple._infer = infer_sequence +nodes.Set._infer = infer_sequence + + +def infer_map(self, context=None): + if not any(isinstance(k, nodes.DictUnpack) for k, _ in self.items): + yield self + else: + items = _infer_map(self, context) + new_seq = type(self)(self.lineno, self.col_offset, self.parent) + new_seq.postinit(list(items.items())) + yield new_seq + + +def _update_with_replacement(lhs_dict, rhs_dict): + """Delete nodes that equate to duplicate keys + + Since an astroid node doesn't 'equal' another node with the same value, + this function uses the as_string method to make sure duplicate keys + don't get through + + Note that both the key and the value are astroid nodes + + Fixes issue with DictUnpack causing duplicte keys + in inferred Dict items + + :param dict(nodes.NodeNG, nodes.NodeNG) lhs_dict: Dictionary to 'merge' nodes into + :param dict(nodes.NodeNG, nodes.NodeNG) rhs_dict: Dictionary with nodes to pull from + :return dict(nodes.NodeNG, nodes.NodeNG): merged dictionary of nodes + """ + combined_dict = itertools.chain(lhs_dict.items(), rhs_dict.items()) + # Overwrite keys which have the same string values + string_map = {key.as_string(): (key, value) for key, value in combined_dict} + # Return to dictionary + return dict(string_map.values()) + + +def _infer_map(node, context): + """Infer all values based on Dict.items""" + values = {} + for name, value in node.items: + if isinstance(name, nodes.DictUnpack): + double_starred = helpers.safe_infer(value, context) + if not double_starred: + raise exceptions.InferenceError + if not isinstance(double_starred, nodes.Dict): + raise exceptions.InferenceError(node=node, context=context) + unpack_items = _infer_map(double_starred, context) + values = _update_with_replacement(values, unpack_items) + else: + key = helpers.safe_infer(name, context=context) + value = helpers.safe_infer(value, context=context) + if any(not elem for elem in (key, value)): + raise exceptions.InferenceError(node=node, context=context) + values = _update_with_replacement(values, {key: value}) + return values + + +nodes.Dict._infer = infer_map + + +def _higher_function_scope(node): + """ Search for the first function which encloses the given + scope. This can be used for looking up in that function's + scope, in case looking up in a lower scope for a particular + name fails. + + :param node: A scope node. + :returns: + ``None``, if no parent function scope was found, + otherwise an instance of :class:`astroid.scoped_nodes.Function`, + which encloses the given node. + """ + current = node + while current.parent and not isinstance(current.parent, nodes.FunctionDef): + current = current.parent + if current and current.parent: + return current.parent + return None + + +def infer_name(self, context=None): + """infer a Name: use name lookup rules""" + frame, stmts = self.lookup(self.name) + if not stmts: + # Try to see if the name is enclosed in a nested function + # and use the higher (first function) scope for searching. + parent_function = _higher_function_scope(self.scope()) + if parent_function: + _, stmts = parent_function.lookup(self.name) + + if not stmts: + raise exceptions.NameInferenceError( + name=self.name, scope=self.scope(), context=context + ) + context = contextmod.copy_context(context) + context.lookupname = self.name + return bases._infer_stmts(stmts, context, frame) + + +# pylint: disable=no-value-for-parameter +nodes.Name._infer = decorators.raise_if_nothing_inferred( + decorators.path_wrapper(infer_name) +) +nodes.AssignName.infer_lhs = infer_name # won't work with a path wrapper + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_call(self, context=None): + """infer a Call node by trying to guess what the function returns""" + callcontext = contextmod.copy_context(context) + callcontext.callcontext = contextmod.CallContext( + args=self.args, keywords=self.keywords + ) + callcontext.boundnode = None + if context is not None: + callcontext.extra_context = _populate_context_lookup(self, context.clone()) + + for callee in self.func.infer(context): + if callee is util.Uninferable: + yield callee + continue + try: + if hasattr(callee, "infer_call_result"): + yield from callee.infer_call_result(caller=self, context=callcontext) + except exceptions.InferenceError: + continue + return dict(node=self, context=context) + + +nodes.Call._infer = infer_call + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_import(self, context=None, asname=True): + """infer an Import node: return the imported module/object""" + name = context.lookupname + if name is None: + raise exceptions.InferenceError(node=self, context=context) + + try: + if asname: + yield self.do_import_module(self.real_name(name)) + else: + yield self.do_import_module(name) + except exceptions.AstroidBuildingError as exc: + raise exceptions.InferenceError(node=self, context=context) from exc + + +nodes.Import._infer = infer_import + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_import_from(self, context=None, asname=True): + """infer a ImportFrom node: return the imported module/object""" + name = context.lookupname + if name is None: + raise exceptions.InferenceError(node=self, context=context) + if asname: + name = self.real_name(name) + + try: + module = self.do_import_module() + except exceptions.AstroidBuildingError as exc: + raise exceptions.InferenceError(node=self, context=context) from exc + + try: + context = contextmod.copy_context(context) + context.lookupname = name + stmts = module.getattr(name, ignore_locals=module is self.root()) + return bases._infer_stmts(stmts, context) + except exceptions.AttributeInferenceError as error: + raise exceptions.InferenceError( + error.message, target=self, attribute=name, context=context + ) from error + + +nodes.ImportFrom._infer = infer_import_from + + +def infer_attribute(self, context=None): + """infer an Attribute node by using getattr on the associated object""" + for owner in self.expr.infer(context): + if owner is util.Uninferable: + yield owner + continue + + if context and context.boundnode: + # This handles the situation where the attribute is accessed through a subclass + # of a base class and the attribute is defined at the base class's level, + # by taking in consideration a redefinition in the subclass. + if isinstance(owner, bases.Instance) and isinstance( + context.boundnode, bases.Instance + ): + try: + if helpers.is_subtype( + helpers.object_type(context.boundnode), + helpers.object_type(owner), + ): + owner = context.boundnode + except exceptions._NonDeducibleTypeHierarchy: + # Can't determine anything useful. + pass + + try: + context.boundnode = owner + yield from owner.igetattr(self.attrname, context) + context.boundnode = None + except (exceptions.AttributeInferenceError, exceptions.InferenceError): + context.boundnode = None + except AttributeError: + # XXX method / function + context.boundnode = None + return dict(node=self, context=context) + + +nodes.Attribute._infer = decorators.raise_if_nothing_inferred( + decorators.path_wrapper(infer_attribute) +) +# won't work with a path wrapper +nodes.AssignAttr.infer_lhs = decorators.raise_if_nothing_inferred(infer_attribute) + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_global(self, context=None): + if context.lookupname is None: + raise exceptions.InferenceError(node=self, context=context) + try: + return bases._infer_stmts(self.root().getattr(context.lookupname), context) + except exceptions.AttributeInferenceError as error: + raise exceptions.InferenceError( + error.message, target=self, attribute=context.lookupname, context=context + ) from error + + +nodes.Global._infer = infer_global + + +_SUBSCRIPT_SENTINEL = object() + + +@decorators.raise_if_nothing_inferred +def infer_subscript(self, context=None): + """Inference for subscripts + + We're understanding if the index is a Const + or a slice, passing the result of inference + to the value's `getitem` method, which should + handle each supported index type accordingly. + """ + + found_one = False + for value in self.value.infer(context): + if value is util.Uninferable: + yield util.Uninferable + return None + for index in self.slice.infer(context): + if index is util.Uninferable: + yield util.Uninferable + return None + + # Try to deduce the index value. + index_value = _SUBSCRIPT_SENTINEL + if value.__class__ == bases.Instance: + index_value = index + else: + if index.__class__ == bases.Instance: + instance_as_index = helpers.class_instance_as_index(index) + if instance_as_index: + index_value = instance_as_index + else: + index_value = index + if index_value is _SUBSCRIPT_SENTINEL: + raise exceptions.InferenceError(node=self, context=context) + + try: + assigned = value.getitem(index_value, context) + except ( + exceptions.AstroidTypeError, + exceptions.AstroidIndexError, + exceptions.AttributeInferenceError, + AttributeError, + ) as exc: + raise exceptions.InferenceError(node=self, context=context) from exc + + # Prevent inferring if the inferred subscript + # is the same as the original subscripted object. + if self is assigned or assigned is util.Uninferable: + yield util.Uninferable + return None + yield from assigned.infer(context) + found_one = True + + if found_one: + return dict(node=self, context=context) + return None + + +nodes.Subscript._infer = decorators.path_wrapper(infer_subscript) +nodes.Subscript.infer_lhs = infer_subscript + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def _infer_boolop(self, context=None): + """Infer a boolean operation (and / or / not). + + The function will calculate the boolean operation + for all pairs generated through inference for each component + node. + """ + values = self.values + if self.op == "or": + predicate = operator.truth + else: + predicate = operator.not_ + + try: + values = [value.infer(context=context) for value in values] + except exceptions.InferenceError: + yield util.Uninferable + return None + + for pair in itertools.product(*values): + if any(item is util.Uninferable for item in pair): + # Can't infer the final result, just yield Uninferable. + yield util.Uninferable + continue + + bool_values = [item.bool_value() for item in pair] + if any(item is util.Uninferable for item in bool_values): + # Can't infer the final result, just yield Uninferable. + yield util.Uninferable + continue + + # Since the boolean operations are short circuited operations, + # this code yields the first value for which the predicate is True + # and if no value respected the predicate, then the last value will + # be returned (or Uninferable if there was no last value). + # This is conforming to the semantics of `and` and `or`: + # 1 and 0 -> 1 + # 0 and 1 -> 0 + # 1 or 0 -> 1 + # 0 or 1 -> 1 + value = util.Uninferable + for value, bool_value in zip(pair, bool_values): + if predicate(bool_value): + yield value + break + else: + yield value + + return dict(node=self, context=context) + + +nodes.BoolOp._infer = _infer_boolop + + +# UnaryOp, BinOp and AugAssign inferences + + +def _filter_operation_errors(self, infer_callable, context, error): + for result in infer_callable(self, context): + if isinstance(result, error): + # For the sake of .infer(), we don't care about operation + # errors, which is the job of pylint. So return something + # which shows that we can't infer the result. + yield util.Uninferable + else: + yield result + + +def _infer_unaryop(self, context=None): + """Infer what an UnaryOp should return when evaluated.""" + for operand in self.operand.infer(context): + try: + yield operand.infer_unary_op(self.op) + except TypeError as exc: + # The operand doesn't support this operation. + yield util.BadUnaryOperationMessage(operand, self.op, exc) + except AttributeError as exc: + meth = protocols.UNARY_OP_METHOD[self.op] + if meth is None: + # `not node`. Determine node's boolean + # value and negate its result, unless it is + # Uninferable, which will be returned as is. + bool_value = operand.bool_value() + if bool_value is not util.Uninferable: + yield nodes.const_factory(not bool_value) + else: + yield util.Uninferable + else: + if not isinstance(operand, (bases.Instance, nodes.ClassDef)): + # The operation was used on something which + # doesn't support it. + yield util.BadUnaryOperationMessage(operand, self.op, exc) + continue + + try: + try: + methods = dunder_lookup.lookup(operand, meth) + except exceptions.AttributeInferenceError: + yield util.BadUnaryOperationMessage(operand, self.op, exc) + continue + + meth = methods[0] + inferred = next(meth.infer(context=context)) + if inferred is util.Uninferable or not inferred.callable(): + continue + + context = contextmod.copy_context(context) + context.callcontext = contextmod.CallContext(args=[operand]) + call_results = inferred.infer_call_result(self, context=context) + result = next(call_results, None) + if result is None: + # Failed to infer, return the same type. + yield operand + else: + yield result + except exceptions.AttributeInferenceError as exc: + # The unary operation special method was not found. + yield util.BadUnaryOperationMessage(operand, self.op, exc) + except exceptions.InferenceError: + yield util.Uninferable + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_unaryop(self, context=None): + """Infer what an UnaryOp should return when evaluated.""" + yield from _filter_operation_errors( + self, _infer_unaryop, context, util.BadUnaryOperationMessage + ) + return dict(node=self, context=context) + + +nodes.UnaryOp._infer_unaryop = _infer_unaryop +nodes.UnaryOp._infer = infer_unaryop + + +def _is_not_implemented(const): + """Check if the given const node is NotImplemented.""" + return isinstance(const, nodes.Const) and const.value is NotImplemented + + +def _invoke_binop_inference(instance, opnode, op, other, context, method_name): + """Invoke binary operation inference on the given instance.""" + methods = dunder_lookup.lookup(instance, method_name) + context = contextmod.bind_context_to_node(context, instance) + method = methods[0] + inferred = next(method.infer(context=context)) + if inferred is util.Uninferable: + raise exceptions.InferenceError + return instance.infer_binary_op(opnode, op, other, context, inferred) + + +def _aug_op(instance, opnode, op, other, context, reverse=False): + """Get an inference callable for an augmented binary operation.""" + method_name = protocols.AUGMENTED_OP_METHOD[op] + return functools.partial( + _invoke_binop_inference, + instance=instance, + op=op, + opnode=opnode, + other=other, + context=context, + method_name=method_name, + ) + + +def _bin_op(instance, opnode, op, other, context, reverse=False): + """Get an inference callable for a normal binary operation. + + If *reverse* is True, then the reflected method will be used instead. + """ + if reverse: + method_name = protocols.REFLECTED_BIN_OP_METHOD[op] + else: + method_name = protocols.BIN_OP_METHOD[op] + return functools.partial( + _invoke_binop_inference, + instance=instance, + op=op, + opnode=opnode, + other=other, + context=context, + method_name=method_name, + ) + + +def _get_binop_contexts(context, left, right): + """Get contexts for binary operations. + + This will return two inference contexts, the first one + for x.__op__(y), the other one for y.__rop__(x), where + only the arguments are inversed. + """ + # The order is important, since the first one should be + # left.__op__(right). + for arg in (right, left): + new_context = context.clone() + new_context.callcontext = contextmod.CallContext(args=[arg]) + new_context.boundnode = None + yield new_context + + +def _same_type(type1, type2): + """Check if type1 is the same as type2.""" + return type1.qname() == type2.qname() + + +def _get_binop_flow( + left, left_type, binary_opnode, right, right_type, context, reverse_context +): + """Get the flow for binary operations. + + The rules are a bit messy: + + * if left and right have the same type, then only one + method will be called, left.__op__(right) + * if left and right are unrelated typewise, then first + left.__op__(right) is tried and if this does not exist + or returns NotImplemented, then right.__rop__(left) is tried. + * if left is a subtype of right, then only left.__op__(right) + is tried. + * if left is a supertype of right, then right.__rop__(left) + is first tried and then left.__op__(right) + """ + op = binary_opnode.op + if _same_type(left_type, right_type): + methods = [_bin_op(left, binary_opnode, op, right, context)] + elif helpers.is_subtype(left_type, right_type): + methods = [_bin_op(left, binary_opnode, op, right, context)] + elif helpers.is_supertype(left_type, right_type): + methods = [ + _bin_op(right, binary_opnode, op, left, reverse_context, reverse=True), + _bin_op(left, binary_opnode, op, right, context), + ] + else: + methods = [ + _bin_op(left, binary_opnode, op, right, context), + _bin_op(right, binary_opnode, op, left, reverse_context, reverse=True), + ] + return methods + + +def _get_aug_flow( + left, left_type, aug_opnode, right, right_type, context, reverse_context +): + """Get the flow for augmented binary operations. + + The rules are a bit messy: + + * if left and right have the same type, then left.__augop__(right) + is first tried and then left.__op__(right). + * if left and right are unrelated typewise, then + left.__augop__(right) is tried, then left.__op__(right) + is tried and then right.__rop__(left) is tried. + * if left is a subtype of right, then left.__augop__(right) + is tried and then left.__op__(right). + * if left is a supertype of right, then left.__augop__(right) + is tried, then right.__rop__(left) and then + left.__op__(right) + """ + bin_op = aug_opnode.op.strip("=") + aug_op = aug_opnode.op + if _same_type(left_type, right_type): + methods = [ + _aug_op(left, aug_opnode, aug_op, right, context), + _bin_op(left, aug_opnode, bin_op, right, context), + ] + elif helpers.is_subtype(left_type, right_type): + methods = [ + _aug_op(left, aug_opnode, aug_op, right, context), + _bin_op(left, aug_opnode, bin_op, right, context), + ] + elif helpers.is_supertype(left_type, right_type): + methods = [ + _aug_op(left, aug_opnode, aug_op, right, context), + _bin_op(right, aug_opnode, bin_op, left, reverse_context, reverse=True), + _bin_op(left, aug_opnode, bin_op, right, context), + ] + else: + methods = [ + _aug_op(left, aug_opnode, aug_op, right, context), + _bin_op(left, aug_opnode, bin_op, right, context), + _bin_op(right, aug_opnode, bin_op, left, reverse_context, reverse=True), + ] + return methods + + +def _infer_binary_operation(left, right, binary_opnode, context, flow_factory): + """Infer a binary operation between a left operand and a right operand + + This is used by both normal binary operations and augmented binary + operations, the only difference is the flow factory used. + """ + + context, reverse_context = _get_binop_contexts(context, left, right) + left_type = helpers.object_type(left) + right_type = helpers.object_type(right) + methods = flow_factory( + left, left_type, binary_opnode, right, right_type, context, reverse_context + ) + for method in methods: + try: + results = list(method()) + except AttributeError: + continue + except exceptions.AttributeInferenceError: + continue + except exceptions.InferenceError: + yield util.Uninferable + return + else: + if any(result is util.Uninferable for result in results): + yield util.Uninferable + return + + if all(map(_is_not_implemented, results)): + continue + not_implemented = sum( + 1 for result in results if _is_not_implemented(result) + ) + if not_implemented and not_implemented != len(results): + # Can't infer yet what this is. + yield util.Uninferable + return + + yield from results + return + # The operation doesn't seem to be supported so let the caller know about it + yield util.BadBinaryOperationMessage(left_type, binary_opnode.op, right_type) + + +def _infer_binop(self, context): + """Binary operation inference logic.""" + left = self.left + right = self.right + + # we use two separate contexts for evaluating lhs and rhs because + # 1. evaluating lhs may leave some undesired entries in context.path + # which may not let us infer right value of rhs + context = context or contextmod.InferenceContext() + lhs_context = contextmod.copy_context(context) + rhs_context = contextmod.copy_context(context) + lhs_iter = left.infer(context=lhs_context) + rhs_iter = right.infer(context=rhs_context) + for lhs, rhs in itertools.product(lhs_iter, rhs_iter): + if any(value is util.Uninferable for value in (rhs, lhs)): + # Don't know how to process this. + yield util.Uninferable + return + + try: + yield from _infer_binary_operation(lhs, rhs, self, context, _get_binop_flow) + except exceptions._NonDeducibleTypeHierarchy: + yield util.Uninferable + + +@decorators.yes_if_nothing_inferred +@decorators.path_wrapper +def infer_binop(self, context=None): + return _filter_operation_errors( + self, _infer_binop, context, util.BadBinaryOperationMessage + ) + + +nodes.BinOp._infer_binop = _infer_binop +nodes.BinOp._infer = infer_binop + + +def _infer_augassign(self, context=None): + """Inference logic for augmented binary operations.""" + if context is None: + context = contextmod.InferenceContext() + + rhs_context = context.clone() + + lhs_iter = self.target.infer_lhs(context=context) + rhs_iter = self.value.infer(context=rhs_context) + for lhs, rhs in itertools.product(lhs_iter, rhs_iter): + if any(value is util.Uninferable for value in (rhs, lhs)): + # Don't know how to process this. + yield util.Uninferable + return + + try: + yield from _infer_binary_operation( + left=lhs, + right=rhs, + binary_opnode=self, + context=context, + flow_factory=_get_aug_flow, + ) + except exceptions._NonDeducibleTypeHierarchy: + yield util.Uninferable + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_augassign(self, context=None): + return _filter_operation_errors( + self, _infer_augassign, context, util.BadBinaryOperationMessage + ) + + +nodes.AugAssign._infer_augassign = _infer_augassign +nodes.AugAssign._infer = infer_augassign + +# End of binary operation inference. + + +@decorators.raise_if_nothing_inferred +def infer_arguments(self, context=None): + name = context.lookupname + if name is None: + raise exceptions.InferenceError(node=self, context=context) + return protocols._arguments_infer_argname(self, name, context) + + +nodes.Arguments._infer = infer_arguments + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_assign(self, context=None): + """infer a AssignName/AssignAttr: need to inspect the RHS part of the + assign node + """ + stmt = self.statement() + if isinstance(stmt, nodes.AugAssign): + return stmt.infer(context) + + stmts = list(self.assigned_stmts(context=context)) + return bases._infer_stmts(stmts, context) + + +nodes.AssignName._infer = infer_assign +nodes.AssignAttr._infer = infer_assign + + +@decorators.raise_if_nothing_inferred +@decorators.path_wrapper +def infer_empty_node(self, context=None): + if not self.has_underlying_object(): + yield util.Uninferable + else: + try: + yield from MANAGER.infer_ast_from_something(self.object, context=context) + except exceptions.AstroidError: + yield util.Uninferable + + +nodes.EmptyNode._infer = infer_empty_node + + +@decorators.raise_if_nothing_inferred +def infer_index(self, context=None): + return self.value.infer(context) + + +nodes.Index._infer = infer_index + +# TODO: move directly into bases.Instance when the dependency hell +# will be solved. +def instance_getitem(self, index, context=None): + # Rewrap index to Const for this case + new_context = contextmod.bind_context_to_node(context, self) + if not context: + context = new_context + + # Create a new callcontext for providing index as an argument. + new_context.callcontext = contextmod.CallContext(args=[index]) + + method = next(self.igetattr("__getitem__", context=context), None) + if not isinstance(method, bases.BoundMethod): + raise exceptions.InferenceError( + "Could not find __getitem__ for {node!r}.", node=self, context=context + ) + + return next(method.infer_call_result(self, new_context)) + + +bases.Instance.getitem = instance_getitem + + +def _populate_context_lookup(call, context): + # Allows context to be saved for later + # for inference inside a function + context_lookup = {} + if context is None: + return context_lookup + for arg in call.args: + if isinstance(arg, nodes.Starred): + context_lookup[arg.value] = context + else: + context_lookup[arg] = context + keywords = call.keywords if call.keywords is not None else [] + for keyword in keywords: + context_lookup[keyword.value] = context + return context_lookup diff --git 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b/venv/lib/python3.7/site-packages/astroid/interpreter/_import/spec.py @@ -0,0 +1,337 @@ +# Copyright (c) 2016-2018 Claudiu Popa +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2017 Chris Philip +# Copyright (c) 2017 Hugo +# Copyright (c) 2017 ioanatia +# Copyright (c) 2017 Calen Pennington +# Copyright (c) 2018 Nick Drozd + +import abc +import collections +import enum +import imp +import os +import sys +import zipimport + +try: + import importlib.machinery + + _HAS_MACHINERY = True +except ImportError: + _HAS_MACHINERY = False + +try: + from functools import lru_cache +except ImportError: + from backports.functools_lru_cache import lru_cache + +from . import util + +ModuleType = enum.Enum( + "ModuleType", + "C_BUILTIN C_EXTENSION PKG_DIRECTORY " + "PY_CODERESOURCE PY_COMPILED PY_FROZEN PY_RESOURCE " + "PY_SOURCE PY_ZIPMODULE PY_NAMESPACE", +) +_ImpTypes = { + imp.C_BUILTIN: ModuleType.C_BUILTIN, + imp.C_EXTENSION: ModuleType.C_EXTENSION, + imp.PKG_DIRECTORY: ModuleType.PKG_DIRECTORY, + imp.PY_COMPILED: ModuleType.PY_COMPILED, + imp.PY_FROZEN: ModuleType.PY_FROZEN, + imp.PY_SOURCE: ModuleType.PY_SOURCE, +} +if hasattr(imp, "PY_RESOURCE"): + _ImpTypes[imp.PY_RESOURCE] = ModuleType.PY_RESOURCE +if hasattr(imp, "PY_CODERESOURCE"): + _ImpTypes[imp.PY_CODERESOURCE] = ModuleType.PY_CODERESOURCE + + +def _imp_type_to_module_type(imp_type): + return _ImpTypes[imp_type] + + +_ModuleSpec = collections.namedtuple( + "_ModuleSpec", "name type location " "origin submodule_search_locations" +) + + +class ModuleSpec(_ModuleSpec): + """Defines a class similar to PEP 420's ModuleSpec + + A module spec defines a name of a module, its type, location + and where submodules can be found, if the module is a package. + """ + + def __new__( + cls, + name, + module_type, + location=None, + origin=None, + submodule_search_locations=None, + ): + return _ModuleSpec.__new__( + cls, + name=name, + type=module_type, + location=location, + origin=origin, + submodule_search_locations=submodule_search_locations, + ) + + +class Finder: + """A finder is a class which knows how to find a particular module.""" + + def __init__(self, path=None): + self._path = path or sys.path + + @abc.abstractmethod + def find_module(self, modname, module_parts, processed, submodule_path): + """Find the given module + + Each finder is responsible for each protocol of finding, as long as + they all return a ModuleSpec. + + :param str modname: The module which needs to be searched. + :param list module_parts: It should be a list of strings, + where each part contributes to the module's + namespace. + :param list processed: What parts from the module parts were processed + so far. + :param list submodule_path: A list of paths where the module + can be looked into. + :returns: A ModuleSpec, describing how and where the module was found, + None, otherwise. + """ + + def contribute_to_path(self, spec, processed): + """Get a list of extra paths where this finder can search.""" + + +class ImpFinder(Finder): + """A finder based on the imp module.""" + + def find_module(self, modname, module_parts, processed, submodule_path): + if submodule_path is not None: + submodule_path = list(submodule_path) + try: + stream, mp_filename, mp_desc = imp.find_module(modname, submodule_path) + except ImportError: + return None + + # Close resources. + if stream: + stream.close() + + return ModuleSpec( + name=modname, + location=mp_filename, + module_type=_imp_type_to_module_type(mp_desc[2]), + ) + + def contribute_to_path(self, spec, processed): + if spec.location is None: + # Builtin. + return None + + if _is_setuptools_namespace(spec.location): + # extend_path is called, search sys.path for module/packages + # of this name see pkgutil.extend_path documentation + path = [ + os.path.join(p, *processed) + for p in sys.path + if os.path.isdir(os.path.join(p, *processed)) + ] + else: + path = [spec.location] + return path + + +class ExplicitNamespacePackageFinder(ImpFinder): + """A finder for the explicit namespace packages, generated through pkg_resources.""" + + def find_module(self, modname, module_parts, processed, submodule_path): + if processed: + modname = ".".join(processed + [modname]) + if util.is_namespace(modname) and modname in sys.modules: + submodule_path = sys.modules[modname].__path__ + return ModuleSpec( + name=modname, + location="", + origin="namespace", + module_type=ModuleType.PY_NAMESPACE, + submodule_search_locations=submodule_path, + ) + return None + + def contribute_to_path(self, spec, processed): + return spec.submodule_search_locations + + +class ZipFinder(Finder): + """Finder that knows how to find a module inside zip files.""" + + def __init__(self, path): + super(ZipFinder, self).__init__(path) + self._zipimporters = _precache_zipimporters(path) + + def find_module(self, modname, module_parts, processed, submodule_path): + try: + file_type, filename, path = _search_zip(module_parts, self._zipimporters) + except ImportError: + return None + + return ModuleSpec( + name=modname, + location=filename, + origin="egg", + module_type=file_type, + submodule_search_locations=path, + ) + + +class PathSpecFinder(Finder): + """Finder based on importlib.machinery.PathFinder.""" + + def find_module(self, modname, module_parts, processed, submodule_path): + spec = importlib.machinery.PathFinder.find_spec(modname, path=submodule_path) + if spec: + # origin can be either a string on older Python versions + # or None in case it is a namespace package: + # https://github.com/python/cpython/pull/5481 + is_namespace_pkg = spec.origin in ("namespace", None) + location = spec.origin if not is_namespace_pkg else None + module_type = ModuleType.PY_NAMESPACE if is_namespace_pkg else None + spec = ModuleSpec( + name=spec.name, + location=location, + origin=spec.origin, + module_type=module_type, + submodule_search_locations=list(spec.submodule_search_locations or []), + ) + return spec + + def contribute_to_path(self, spec, processed): + if spec.type == ModuleType.PY_NAMESPACE: + return spec.submodule_search_locations + return None + + +_SPEC_FINDERS = (ImpFinder, ZipFinder) +if _HAS_MACHINERY and sys.version_info[:2] >= (3, 4): + _SPEC_FINDERS += (PathSpecFinder,) +_SPEC_FINDERS += (ExplicitNamespacePackageFinder,) + + +def _is_setuptools_namespace(location): + try: + with open(os.path.join(location, "__init__.py"), "rb") as stream: + data = stream.read(4096) + except IOError: + pass + else: + extend_path = b"pkgutil" in data and b"extend_path" in data + declare_namespace = ( + b"pkg_resources" in data and b"declare_namespace(__name__)" in data + ) + return extend_path or declare_namespace + + +@lru_cache() +def _cached_set_diff(left, right): + result = set(left) + result.difference_update(right) + return result + + +def _precache_zipimporters(path=None): + pic = sys.path_importer_cache + + # When measured, despite having the same complexity (O(n)), + # converting to tuples and then caching the conversion to sets + # and the set difference is faster than converting to sets + # and then only caching the set difference. + + req_paths = tuple(path or sys.path) + cached_paths = tuple(pic) + new_paths = _cached_set_diff(req_paths, cached_paths) + for entry_path in new_paths: + try: + pic[entry_path] = zipimport.zipimporter(entry_path) + except zipimport.ZipImportError: + continue + return pic + + +def _search_zip(modpath, pic): + for filepath, importer in list(pic.items()): + if importer is not None: + found = importer.find_module(modpath[0]) + if found: + if not importer.find_module(os.path.sep.join(modpath)): + raise ImportError( + "No module named %s in %s/%s" + % (".".join(modpath[1:]), filepath, modpath) + ) + # import code; code.interact(local=locals()) + return ( + ModuleType.PY_ZIPMODULE, + os.path.abspath(filepath) + os.path.sep + os.path.sep.join(modpath), + filepath, + ) + raise ImportError("No module named %s" % ".".join(modpath)) + + +def _find_spec_with_path(search_path, modname, module_parts, processed, submodule_path): + finders = [finder(search_path) for finder in _SPEC_FINDERS] + for finder in finders: + spec = finder.find_module(modname, module_parts, processed, submodule_path) + if spec is None: + continue + return finder, spec + + raise ImportError("No module named %s" % ".".join(module_parts)) + + +def find_spec(modpath, path=None): + """Find a spec for the given module. + + :type modpath: list or tuple + :param modpath: + split module's name (i.e name of a module or package split + on '.'), with leading empty strings for explicit relative import + + :type path: list or None + :param path: + optional list of path where the module or package should be + searched (use sys.path if nothing or None is given) + + :rtype: ModuleSpec + :return: A module spec, which describes how the module was + found and where. + """ + _path = path or sys.path + + # Need a copy for not mutating the argument. + modpath = modpath[:] + + submodule_path = None + module_parts = modpath[:] + processed = [] + + while modpath: + modname = modpath.pop(0) + finder, spec = _find_spec_with_path( + _path, modname, module_parts, processed, submodule_path or path + ) + processed.append(modname) + if modpath: + submodule_path = finder.contribute_to_path(spec, processed) + + if spec.type == ModuleType.PKG_DIRECTORY: + spec = spec._replace(submodule_search_locations=submodule_path) + + return spec diff --git a/venv/lib/python3.7/site-packages/astroid/interpreter/_import/util.py b/venv/lib/python3.7/site-packages/astroid/interpreter/_import/util.py new file mode 100644 index 0000000..a917bd3 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/interpreter/_import/util.py @@ -0,0 +1,10 @@ +# Copyright (c) 2016, 2018 Claudiu Popa + +try: + import pkg_resources +except ImportError: + pkg_resources = None + + +def is_namespace(modname): + return pkg_resources is not None and modname in pkg_resources._namespace_packages diff --git a/venv/lib/python3.7/site-packages/astroid/interpreter/dunder_lookup.py b/venv/lib/python3.7/site-packages/astroid/interpreter/dunder_lookup.py new file mode 100644 index 0000000..0ae9bc9 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/interpreter/dunder_lookup.py @@ -0,0 +1,66 @@ +# Copyright (c) 2016-2018 Claudiu Popa +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Contains logic for retrieving special methods. + +This implementation does not rely on the dot attribute access +logic, found in ``.getattr()``. The difference between these two +is that the dunder methods are looked with the type slots +(you can find more about these here +http://lucumr.pocoo.org/2014/8/16/the-python-i-would-like-to-see/) +As such, the lookup for the special methods is actually simpler than +the dot attribute access. +""" +import itertools + +import astroid +from astroid import exceptions + + +def _lookup_in_mro(node, name): + attrs = node.locals.get(name, []) + + nodes = itertools.chain.from_iterable( + ancestor.locals.get(name, []) for ancestor in node.ancestors(recurs=True) + ) + values = list(itertools.chain(attrs, nodes)) + if not values: + raise exceptions.AttributeInferenceError(attribute=name, target=node) + + return values + + +def lookup(node, name): + """Lookup the given special method name in the given *node* + + If the special method was found, then a list of attributes + will be returned. Otherwise, `astroid.AttributeInferenceError` + is going to be raised. + """ + if isinstance( + node, (astroid.List, astroid.Tuple, astroid.Const, astroid.Dict, astroid.Set) + ): + return _builtin_lookup(node, name) + if isinstance(node, astroid.Instance): + return _lookup_in_mro(node, name) + if isinstance(node, astroid.ClassDef): + return _class_lookup(node, name) + + raise exceptions.AttributeInferenceError(attribute=name, target=node) + + +def _class_lookup(node, name): + metaclass = node.metaclass() + if metaclass is None: + raise exceptions.AttributeInferenceError(attribute=name, target=node) + + return _lookup_in_mro(metaclass, name) + + +def _builtin_lookup(node, name): + values = node.locals.get(name, []) + if not values: + raise exceptions.AttributeInferenceError(attribute=name, target=node) + + return values diff --git a/venv/lib/python3.7/site-packages/astroid/interpreter/objectmodel.py b/venv/lib/python3.7/site-packages/astroid/interpreter/objectmodel.py new file mode 100644 index 0000000..581930d --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/interpreter/objectmodel.py @@ -0,0 +1,728 @@ +# Copyright (c) 2016-2018 Claudiu Popa +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2017-2018 Bryce Guinta +# Copyright (c) 2017 Ceridwen +# Copyright (c) 2017 Calen Pennington +# Copyright (c) 2018 Nick Drozd +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER +""" +Data object model, as per https://docs.python.org/3/reference/datamodel.html. + +This module describes, at least partially, a data object model for some +of astroid's nodes. The model contains special attributes that nodes such +as functions, classes, modules etc have, such as __doc__, __class__, +__module__ etc, being used when doing attribute lookups over nodes. + +For instance, inferring `obj.__class__` will first trigger an inference +of the `obj` variable. If it was successfully inferred, then an attribute +`__class__ will be looked for in the inferred object. This is the part +where the data model occurs. The model is attached to those nodes +and the lookup mechanism will try to see if attributes such as +`__class__` are defined by the model or not. If they are defined, +the model will be requested to return the corresponding value of that +attribute. Thus the model can be viewed as a special part of the lookup +mechanism. +""" + +import itertools +import pprint +import os +import types +from functools import lru_cache + +import astroid +from astroid import context as contextmod +from astroid import exceptions +from astroid import node_classes + + +IMPL_PREFIX = "attr_" + + +def _dunder_dict(instance, attributes): + obj = node_classes.Dict(parent=instance) + + # Convert the keys to node strings + keys = [ + node_classes.Const(value=value, parent=obj) for value in list(attributes.keys()) + ] + + # The original attribute has a list of elements for each key, + # but that is not useful for retrieving the special attribute's value. + # In this case, we're picking the last value from each list. + values = [elem[-1] for elem in attributes.values()] + + obj.postinit(list(zip(keys, values))) + return obj + + +class ObjectModel: + def __init__(self): + self._instance = None + + def __repr__(self): + result = [] + cname = type(self).__name__ + string = "%(cname)s(%(fields)s)" + alignment = len(cname) + 1 + for field in sorted(self.attributes()): + width = 80 - len(field) - alignment + lines = pprint.pformat(field, indent=2, width=width).splitlines(True) + + inner = [lines[0]] + for line in lines[1:]: + inner.append(" " * alignment + line) + result.append(field) + + return string % { + "cname": cname, + "fields": (",\n" + " " * alignment).join(result), + } + + def __call__(self, instance): + self._instance = instance + return self + + def __get__(self, instance, cls=None): + # ObjectModel needs to be a descriptor so that just doing + # `special_attributes = SomeObjectModel` should be enough in the body of a node. + # But at the same time, node.special_attributes should return an object + # which can be used for manipulating the special attributes. That's the reason + # we pass the instance through which it got accessed to ObjectModel.__call__, + # returning itself afterwards, so we can still have access to the + # underlying data model and to the instance for which it got accessed. + return self(instance) + + def __contains__(self, name): + return name in self.attributes() + + @lru_cache(maxsize=None) + def attributes(self): + """Get the attributes which are exported by this object model.""" + return [ + obj[len(IMPL_PREFIX) :] for obj in dir(self) if obj.startswith(IMPL_PREFIX) + ] + + def lookup(self, name): + """Look up the given *name* in the current model + + It should return an AST or an interpreter object, + but if the name is not found, then an AttributeInferenceError will be raised. + """ + + if name in self.attributes(): + return getattr(self, IMPL_PREFIX + name) + raise exceptions.AttributeInferenceError(target=self._instance, attribute=name) + + +class ModuleModel(ObjectModel): + def _builtins(self): + builtins_ast_module = astroid.MANAGER.builtins_module + return builtins_ast_module.special_attributes.lookup("__dict__") + + @property + def attr_builtins(self): + return self._builtins() + + @property + def attr___path__(self): + if not self._instance.package: + raise exceptions.AttributeInferenceError( + target=self._instance, attribute="__path__" + ) + + path_objs = [ + node_classes.Const( + value=path + if not path.endswith("__init__.py") + else os.path.dirname(path), + parent=self._instance, + ) + for path in self._instance.path + ] + + container = node_classes.List(parent=self._instance) + container.postinit(path_objs) + + return container + + @property + def attr___name__(self): + return node_classes.Const(value=self._instance.name, parent=self._instance) + + @property + def attr___doc__(self): + return node_classes.Const(value=self._instance.doc, parent=self._instance) + + @property + def attr___file__(self): + return node_classes.Const(value=self._instance.file, parent=self._instance) + + @property + def attr___dict__(self): + return _dunder_dict(self._instance, self._instance.globals) + + @property + def attr___package__(self): + if not self._instance.package: + value = "" + else: + value = self._instance.name + + return node_classes.Const(value=value, parent=self._instance) + + # These are related to the Python 3 implementation of the + # import system, + # https://docs.python.org/3/reference/import.html#import-related-module-attributes + + @property + def attr___spec__(self): + # No handling for now. + return node_classes.Unknown() + + @property + def attr___loader__(self): + # No handling for now. + return node_classes.Unknown() + + @property + def attr___cached__(self): + # No handling for now. + return node_classes.Unknown() + + +class FunctionModel(ObjectModel): + @property + def attr___name__(self): + return node_classes.Const(value=self._instance.name, parent=self._instance) + + @property + def attr___doc__(self): + return node_classes.Const(value=self._instance.doc, parent=self._instance) + + @property + def attr___qualname__(self): + return node_classes.Const(value=self._instance.qname(), parent=self._instance) + + @property + def attr___defaults__(self): + func = self._instance + if not func.args.defaults: + return node_classes.Const(value=None, parent=func) + + defaults_obj = node_classes.Tuple(parent=func) + defaults_obj.postinit(func.args.defaults) + return defaults_obj + + @property + def attr___annotations__(self): + obj = node_classes.Dict(parent=self._instance) + + if not self._instance.returns: + returns = None + else: + returns = self._instance.returns + + args = self._instance.args + pair_annotations = itertools.chain( + zip(args.args or [], args.annotations), + zip(args.kwonlyargs, args.kwonlyargs_annotations), + ) + + annotations = { + arg.name: annotation for (arg, annotation) in pair_annotations if annotation + } + if args.varargannotation: + annotations[args.vararg] = args.varargannotation + if args.kwargannotation: + annotations[args.kwarg] = args.kwargannotation + if returns: + annotations["return"] = returns + + items = [ + (node_classes.Const(key, parent=obj), value) + for (key, value) in annotations.items() + ] + + obj.postinit(items) + return obj + + @property + def attr___dict__(self): + return node_classes.Dict(parent=self._instance) + + attr___globals__ = attr___dict__ + + @property + def attr___kwdefaults__(self): + def _default_args(args, parent): + for arg in args.kwonlyargs: + try: + default = args.default_value(arg.name) + except exceptions.NoDefault: + continue + + name = node_classes.Const(arg.name, parent=parent) + yield name, default + + args = self._instance.args + obj = node_classes.Dict(parent=self._instance) + defaults = dict(_default_args(args, obj)) + + obj.postinit(list(defaults.items())) + return obj + + @property + def attr___module__(self): + return node_classes.Const(self._instance.root().qname()) + + @property + def attr___get__(self): + from astroid import bases + + func = self._instance + + class DescriptorBoundMethod(bases.BoundMethod): + """Bound method which knows how to understand calling descriptor binding.""" + + def implicit_parameters(self): + # Different than BoundMethod since the signature + # is different. + return 0 + + def infer_call_result(self, caller, context=None): + if len(caller.args) != 2: + raise exceptions.InferenceError( + "Invalid arguments for descriptor binding", + target=self, + context=context, + ) + + context = contextmod.copy_context(context) + cls = next(caller.args[0].infer(context=context)) + + if cls is astroid.Uninferable: + raise exceptions.InferenceError( + "Invalid class inferred", target=self, context=context + ) + + # For some reason func is a Node that the below + # code is not expecting + if isinstance(func, bases.BoundMethod): + yield func + return + + # Rebuild the original value, but with the parent set as the + # class where it will be bound. + new_func = func.__class__( + name=func.name, + doc=func.doc, + lineno=func.lineno, + col_offset=func.col_offset, + parent=cls, + ) + # pylint: disable=no-member + new_func.postinit(func.args, func.body, func.decorators, func.returns) + + # Build a proper bound method that points to our newly built function. + proxy = bases.UnboundMethod(new_func) + yield bases.BoundMethod(proxy=proxy, bound=cls) + + @property + def args(self): + """Overwrite the underlying args to match those of the underlying func + + Usually the underlying *func* is a function/method, as in: + + def test(self): + pass + + This has only the *self* parameter but when we access test.__get__ + we get a new object which has two parameters, *self* and *type*. + """ + nonlocal func + params = func.args.args.copy() + params.append(astroid.AssignName(name="type")) + arguments = astroid.Arguments(parent=func.args.parent) + arguments.postinit( + args=params, + defaults=[], + kwonlyargs=[], + kw_defaults=[], + annotations=[], + ) + return arguments + + return DescriptorBoundMethod(proxy=self._instance, bound=self._instance) + + # These are here just for completion. + @property + def attr___ne__(self): + return node_classes.Unknown() + + attr___subclasshook__ = attr___ne__ + attr___str__ = attr___ne__ + attr___sizeof__ = attr___ne__ + attr___setattr___ = attr___ne__ + attr___repr__ = attr___ne__ + attr___reduce__ = attr___ne__ + attr___reduce_ex__ = attr___ne__ + attr___new__ = attr___ne__ + attr___lt__ = attr___ne__ + attr___eq__ = attr___ne__ + attr___gt__ = attr___ne__ + attr___format__ = attr___ne__ + attr___delattr___ = attr___ne__ + attr___getattribute__ = attr___ne__ + attr___hash__ = attr___ne__ + attr___init__ = attr___ne__ + attr___dir__ = attr___ne__ + attr___call__ = attr___ne__ + attr___class__ = attr___ne__ + attr___closure__ = attr___ne__ + attr___code__ = attr___ne__ + + +class ClassModel(ObjectModel): + @property + def attr___module__(self): + return node_classes.Const(self._instance.root().qname()) + + @property + def attr___name__(self): + return node_classes.Const(self._instance.name) + + @property + def attr___qualname__(self): + return node_classes.Const(self._instance.qname()) + + @property + def attr___doc__(self): + return node_classes.Const(self._instance.doc) + + @property + def attr___mro__(self): + if not self._instance.newstyle: + raise exceptions.AttributeInferenceError( + target=self._instance, attribute="__mro__" + ) + + mro = self._instance.mro() + obj = node_classes.Tuple(parent=self._instance) + obj.postinit(mro) + return obj + + @property + def attr_mro(self): + if not self._instance.newstyle: + raise exceptions.AttributeInferenceError( + target=self._instance, attribute="mro" + ) + + from astroid import bases + + other_self = self + + # Cls.mro is a method and we need to return one in order to have a proper inference. + # The method we're returning is capable of inferring the underlying MRO though. + class MroBoundMethod(bases.BoundMethod): + def infer_call_result(self, caller, context=None): + yield other_self.attr___mro__ + + implicit_metaclass = self._instance.implicit_metaclass() + mro_method = implicit_metaclass.locals["mro"][0] + return MroBoundMethod(proxy=mro_method, bound=implicit_metaclass) + + @property + def attr___bases__(self): + obj = node_classes.Tuple() + context = contextmod.InferenceContext() + elts = list(self._instance._inferred_bases(context)) + obj.postinit(elts=elts) + return obj + + @property + def attr___class__(self): + from astroid import helpers + + return helpers.object_type(self._instance) + + @property + def attr___subclasses__(self): + """Get the subclasses of the underlying class + + This looks only in the current module for retrieving the subclasses, + thus it might miss a couple of them. + """ + from astroid import bases + from astroid import scoped_nodes + + if not self._instance.newstyle: + raise exceptions.AttributeInferenceError( + target=self._instance, attribute="__subclasses__" + ) + + qname = self._instance.qname() + root = self._instance.root() + classes = [ + cls + for cls in root.nodes_of_class(scoped_nodes.ClassDef) + if cls != self._instance and cls.is_subtype_of(qname) + ] + + obj = node_classes.List(parent=self._instance) + obj.postinit(classes) + + class SubclassesBoundMethod(bases.BoundMethod): + def infer_call_result(self, caller, context=None): + yield obj + + implicit_metaclass = self._instance.implicit_metaclass() + subclasses_method = implicit_metaclass.locals["__subclasses__"][0] + return SubclassesBoundMethod(proxy=subclasses_method, bound=implicit_metaclass) + + @property + def attr___dict__(self): + return node_classes.Dict(parent=self._instance) + + +class SuperModel(ObjectModel): + @property + def attr___thisclass__(self): + return self._instance.mro_pointer + + @property + def attr___self_class__(self): + return self._instance._self_class + + @property + def attr___self__(self): + return self._instance.type + + @property + def attr___class__(self): + return self._instance._proxied + + +class UnboundMethodModel(ObjectModel): + @property + def attr___class__(self): + from astroid import helpers + + return helpers.object_type(self._instance) + + @property + def attr___func__(self): + return self._instance._proxied + + @property + def attr___self__(self): + return node_classes.Const(value=None, parent=self._instance) + + attr_im_func = attr___func__ + attr_im_class = attr___class__ + attr_im_self = attr___self__ + + +class BoundMethodModel(FunctionModel): + @property + def attr___func__(self): + return self._instance._proxied._proxied + + @property + def attr___self__(self): + return self._instance.bound + + +class GeneratorModel(FunctionModel): + def __new__(cls, *args, **kwargs): + # Append the values from the GeneratorType unto this object. + ret = super(GeneratorModel, cls).__new__(cls, *args, **kwargs) + generator = astroid.MANAGER.builtins_module["generator"] + for name, values in generator.locals.items(): + method = values[0] + patched = lambda cls, meth=method: meth + + setattr(type(ret), IMPL_PREFIX + name, property(patched)) + + return ret + + @property + def attr___name__(self): + return node_classes.Const( + value=self._instance.parent.name, parent=self._instance + ) + + @property + def attr___doc__(self): + return node_classes.Const( + value=self._instance.parent.doc, parent=self._instance + ) + + +class AsyncGeneratorModel(GeneratorModel): + def __new__(cls, *args, **kwargs): + # Append the values from the AGeneratorType unto this object. + ret = super().__new__(cls, *args, **kwargs) + astroid_builtins = astroid.MANAGER.builtins_module + generator = astroid_builtins.get("async_generator") + if generator is None: + # Make it backward compatible. + generator = astroid_builtins.get("generator") + + for name, values in generator.locals.items(): + method = values[0] + patched = lambda cls, meth=method: meth + + setattr(type(ret), IMPL_PREFIX + name, property(patched)) + + return ret + + +class InstanceModel(ObjectModel): + @property + def attr___class__(self): + return self._instance._proxied + + @property + def attr___module__(self): + return node_classes.Const(self._instance.root().qname()) + + @property + def attr___doc__(self): + return node_classes.Const(self._instance.doc) + + @property + def attr___dict__(self): + return _dunder_dict(self._instance, self._instance.instance_attrs) + + +# Exception instances + + +class ExceptionInstanceModel(InstanceModel): + @property + def attr_args(self): + message = node_classes.Const("") + args = node_classes.Tuple(parent=self._instance) + args.postinit((message,)) + return args + + @property + def attr___traceback__(self): + builtins_ast_module = astroid.MANAGER.builtins_module + traceback_type = builtins_ast_module[types.TracebackType.__name__] + return traceback_type.instantiate_class() + + +class SyntaxErrorInstanceModel(ExceptionInstanceModel): + @property + def attr_text(self): + return node_classes.Const("") + + +class OSErrorInstanceModel(ExceptionInstanceModel): + @property + def attr_filename(self): + return node_classes.Const("") + + @property + def attr_errno(self): + return node_classes.Const(0) + + @property + def attr_strerror(self): + return node_classes.Const("") + + attr_filename2 = attr_filename + + +class ImportErrorInstanceModel(ExceptionInstanceModel): + @property + def attr_name(self): + return node_classes.Const("") + + @property + def attr_path(self): + return node_classes.Const("") + + +BUILTIN_EXCEPTIONS = { + "builtins.SyntaxError": SyntaxErrorInstanceModel, + "builtins.ImportError": ImportErrorInstanceModel, + # These are all similar to OSError in terms of attributes + "builtins.OSError": OSErrorInstanceModel, + "builtins.BlockingIOError": OSErrorInstanceModel, + "builtins.BrokenPipeError": OSErrorInstanceModel, + "builtins.ChildProcessError": OSErrorInstanceModel, + "builtins.ConnectionAbortedError": OSErrorInstanceModel, + "builtins.ConnectionError": OSErrorInstanceModel, + "builtins.ConnectionRefusedError": OSErrorInstanceModel, + "builtins.ConnectionResetError": OSErrorInstanceModel, + "builtins.FileExistsError": OSErrorInstanceModel, + "builtins.FileNotFoundError": OSErrorInstanceModel, + "builtins.InterruptedError": OSErrorInstanceModel, + "builtins.IsADirectoryError": OSErrorInstanceModel, + "builtins.NotADirectoryError": OSErrorInstanceModel, + "builtins.PermissionError": OSErrorInstanceModel, + "builtins.ProcessLookupError": OSErrorInstanceModel, + "builtins.TimeoutError": OSErrorInstanceModel, +} + + +class DictModel(ObjectModel): + @property + def attr___class__(self): + return self._instance._proxied + + def _generic_dict_attribute(self, obj, name): + """Generate a bound method that can infer the given *obj*.""" + + class DictMethodBoundMethod(astroid.BoundMethod): + def infer_call_result(self, caller, context=None): + yield obj + + meth = next(self._instance._proxied.igetattr(name)) + return DictMethodBoundMethod(proxy=meth, bound=self._instance) + + @property + def attr_items(self): + elems = [] + obj = node_classes.List(parent=self._instance) + for key, value in self._instance.items: + elem = node_classes.Tuple(parent=obj) + elem.postinit((key, value)) + elems.append(elem) + obj.postinit(elts=elems) + + from astroid import objects + + obj = objects.DictItems(obj) + + return self._generic_dict_attribute(obj, "items") + + @property + def attr_keys(self): + keys = [key for (key, _) in self._instance.items] + obj = node_classes.List(parent=self._instance) + obj.postinit(elts=keys) + + from astroid import objects + + obj = objects.DictKeys(obj) + + return self._generic_dict_attribute(obj, "keys") + + @property + def attr_values(self): + + values = [value for (_, value) in self._instance.items] + obj = node_classes.List(parent=self._instance) + obj.postinit(values) + + from astroid import objects + + obj = objects.DictValues(obj) + + return self._generic_dict_attribute(obj, "values") diff --git a/venv/lib/python3.7/site-packages/astroid/manager.py b/venv/lib/python3.7/site-packages/astroid/manager.py new file mode 100644 index 0000000..4388514 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/manager.py @@ -0,0 +1,327 @@ +# Copyright (c) 2006-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 BioGeek +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2017 Iva Miholic +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 Nick Drozd + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""astroid manager: avoid multiple astroid build of a same module when +possible by providing a class responsible to get astroid representation +from various source and using a cache of built modules) +""" + +import os +import zipimport + +from astroid import exceptions +from astroid.interpreter._import import spec +from astroid import modutils +from astroid import transforms + + +def safe_repr(obj): + try: + return repr(obj) + except Exception: # pylint: disable=broad-except + return "???" + + +class AstroidManager: + """the astroid manager, responsible to build astroid from files + or modules. + + Use the Borg pattern. + """ + + name = "astroid loader" + brain = {} + + def __init__(self): + self.__dict__ = AstroidManager.brain + if not self.__dict__: + # NOTE: cache entries are added by the [re]builder + self.astroid_cache = {} + self._mod_file_cache = {} + self._failed_import_hooks = [] + self.always_load_extensions = False + self.optimize_ast = False + self.extension_package_whitelist = set() + self._transform = transforms.TransformVisitor() + + # Export these APIs for convenience + self.register_transform = self._transform.register_transform + self.unregister_transform = self._transform.unregister_transform + self.max_inferable_values = 100 + + @property + def builtins_module(self): + return self.astroid_cache["builtins"] + + def visit_transforms(self, node): + """Visit the transforms and apply them to the given *node*.""" + return self._transform.visit(node) + + def ast_from_file(self, filepath, modname=None, fallback=True, source=False): + """given a module name, return the astroid object""" + try: + filepath = modutils.get_source_file(filepath, include_no_ext=True) + source = True + except modutils.NoSourceFile: + pass + if modname is None: + try: + modname = ".".join(modutils.modpath_from_file(filepath)) + except ImportError: + modname = filepath + if ( + modname in self.astroid_cache + and self.astroid_cache[modname].file == filepath + ): + return self.astroid_cache[modname] + if source: + from astroid.builder import AstroidBuilder + + return AstroidBuilder(self).file_build(filepath, modname) + if fallback and modname: + return self.ast_from_module_name(modname) + raise exceptions.AstroidBuildingError( + "Unable to build an AST for {path}.", path=filepath + ) + + def _build_stub_module(self, modname): + from astroid.builder import AstroidBuilder + + return AstroidBuilder(self).string_build("", modname) + + def _build_namespace_module(self, modname, path): + from astroid.builder import build_namespace_package_module + + return build_namespace_package_module(modname, path) + + def _can_load_extension(self, modname): + if self.always_load_extensions: + return True + if modutils.is_standard_module(modname): + return True + parts = modname.split(".") + return any( + ".".join(parts[:x]) in self.extension_package_whitelist + for x in range(1, len(parts) + 1) + ) + + def ast_from_module_name(self, modname, context_file=None): + """given a module name, return the astroid object""" + if modname in self.astroid_cache: + return self.astroid_cache[modname] + if modname == "__main__": + return self._build_stub_module(modname) + old_cwd = os.getcwd() + if context_file: + os.chdir(os.path.dirname(context_file)) + try: + found_spec = self.file_from_module_name(modname, context_file) + if found_spec.type == spec.ModuleType.PY_ZIPMODULE: + module = self.zip_import_data(found_spec.location) + if module is not None: + return module + + elif found_spec.type in ( + spec.ModuleType.C_BUILTIN, + spec.ModuleType.C_EXTENSION, + ): + if ( + found_spec.type == spec.ModuleType.C_EXTENSION + and not self._can_load_extension(modname) + ): + return self._build_stub_module(modname) + try: + module = modutils.load_module_from_name(modname) + except Exception as ex: + raise exceptions.AstroidImportError( + "Loading {modname} failed with:\n{error}", + modname=modname, + path=found_spec.location, + ) from ex + return self.ast_from_module(module, modname) + + elif found_spec.type == spec.ModuleType.PY_COMPILED: + raise exceptions.AstroidImportError( + "Unable to load compiled module {modname}.", + modname=modname, + path=found_spec.location, + ) + + elif found_spec.type == spec.ModuleType.PY_NAMESPACE: + return self._build_namespace_module( + modname, found_spec.submodule_search_locations + ) + + if found_spec.location is None: + raise exceptions.AstroidImportError( + "Can't find a file for module {modname}.", modname=modname + ) + + return self.ast_from_file(found_spec.location, modname, fallback=False) + except exceptions.AstroidBuildingError as e: + for hook in self._failed_import_hooks: + try: + return hook(modname) + except exceptions.AstroidBuildingError: + pass + raise e + finally: + os.chdir(old_cwd) + + def zip_import_data(self, filepath): + if zipimport is None: + return None + from astroid.builder import AstroidBuilder + + builder = AstroidBuilder(self) + for ext in (".zip", ".egg"): + try: + eggpath, resource = filepath.rsplit(ext + os.path.sep, 1) + except ValueError: + continue + try: + importer = zipimport.zipimporter(eggpath + ext) + zmodname = resource.replace(os.path.sep, ".") + if importer.is_package(resource): + zmodname = zmodname + ".__init__" + module = builder.string_build( + importer.get_source(resource), zmodname, filepath + ) + return module + except Exception: # pylint: disable=broad-except + continue + return None + + def file_from_module_name(self, modname, contextfile): + try: + value = self._mod_file_cache[(modname, contextfile)] + except KeyError: + try: + value = modutils.file_info_from_modpath( + modname.split("."), context_file=contextfile + ) + except ImportError as ex: + value = exceptions.AstroidImportError( + "Failed to import module {modname} with error:\n{error}.", + modname=modname, + error=ex, + ) + self._mod_file_cache[(modname, contextfile)] = value + if isinstance(value, exceptions.AstroidBuildingError): + raise value + return value + + def ast_from_module(self, module, modname=None): + """given an imported module, return the astroid object""" + modname = modname or module.__name__ + if modname in self.astroid_cache: + return self.astroid_cache[modname] + try: + # some builtin modules don't have __file__ attribute + filepath = module.__file__ + if modutils.is_python_source(filepath): + return self.ast_from_file(filepath, modname) + except AttributeError: + pass + from astroid.builder import AstroidBuilder + + return AstroidBuilder(self).module_build(module, modname) + + def ast_from_class(self, klass, modname=None): + """get astroid for the given class""" + if modname is None: + try: + modname = klass.__module__ + except AttributeError as exc: + raise exceptions.AstroidBuildingError( + "Unable to get module for class {class_name}.", + cls=klass, + class_repr=safe_repr(klass), + modname=modname, + ) from exc + modastroid = self.ast_from_module_name(modname) + return modastroid.getattr(klass.__name__)[0] # XXX + + def infer_ast_from_something(self, obj, context=None): + """infer astroid for the given class""" + if hasattr(obj, "__class__") and not isinstance(obj, type): + klass = obj.__class__ + else: + klass = obj + try: + modname = klass.__module__ + except AttributeError as exc: + raise exceptions.AstroidBuildingError( + "Unable to get module for {class_repr}.", + cls=klass, + class_repr=safe_repr(klass), + ) from exc + except Exception as exc: + raise exceptions.AstroidImportError( + "Unexpected error while retrieving module for {class_repr}:\n" + "{error}", + cls=klass, + class_repr=safe_repr(klass), + ) from exc + try: + name = klass.__name__ + except AttributeError as exc: + raise exceptions.AstroidBuildingError( + "Unable to get name for {class_repr}:\n", + cls=klass, + class_repr=safe_repr(klass), + ) from exc + except Exception as exc: + raise exceptions.AstroidImportError( + "Unexpected error while retrieving name for {class_repr}:\n" "{error}", + cls=klass, + class_repr=safe_repr(klass), + ) from exc + # take care, on living object __module__ is regularly wrong :( + modastroid = self.ast_from_module_name(modname) + if klass is obj: + for inferred in modastroid.igetattr(name, context): + yield inferred + else: + for inferred in modastroid.igetattr(name, context): + yield inferred.instantiate_class() + + def register_failed_import_hook(self, hook): + """Registers a hook to resolve imports that cannot be found otherwise. + + `hook` must be a function that accepts a single argument `modname` which + contains the name of the module or package that could not be imported. + If `hook` can resolve the import, must return a node of type `astroid.Module`, + otherwise, it must raise `AstroidBuildingError`. + """ + self._failed_import_hooks.append(hook) + + def cache_module(self, module): + """Cache a module if no module with the same name is known yet.""" + self.astroid_cache.setdefault(module.name, module) + + def bootstrap(self): + """Bootstrap the required AST modules needed for the manager to work + + The bootstrap usually involves building the AST for the builtins + module, which is required by the rest of astroid to work correctly. + """ + import astroid.raw_building + + astroid.raw_building._astroid_bootstrapping() + + def clear_cache(self): + """Clear the underlying cache. Also bootstraps the builtins module.""" + self.astroid_cache.clear() + self.bootstrap() diff --git a/venv/lib/python3.7/site-packages/astroid/mixins.py b/venv/lib/python3.7/site-packages/astroid/mixins.py new file mode 100644 index 0000000..497a840 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/mixins.py @@ -0,0 +1,160 @@ +# Copyright (c) 2010-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014-2016, 2018 Claudiu Popa +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2018 Nick Drozd + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""This module contains some mixins for the different nodes. +""" +import itertools + +from astroid import decorators +from astroid import exceptions + + +class BlockRangeMixIn: + """override block range """ + + @decorators.cachedproperty + def blockstart_tolineno(self): + return self.lineno + + def _elsed_block_range(self, lineno, orelse, last=None): + """handle block line numbers range for try/finally, for, if and while + statements + """ + if lineno == self.fromlineno: + return lineno, lineno + if orelse: + if lineno >= orelse[0].fromlineno: + return lineno, orelse[-1].tolineno + return lineno, orelse[0].fromlineno - 1 + return lineno, last or self.tolineno + + +class FilterStmtsMixin: + """Mixin for statement filtering and assignment type""" + + def _get_filtered_stmts(self, _, node, _stmts, mystmt): + """method used in _filter_stmts to get statements and trigger break""" + if self.statement() is mystmt: + # original node's statement is the assignment, only keep + # current node (gen exp, list comp) + return [node], True + return _stmts, False + + def assign_type(self): + return self + + +class AssignTypeMixin: + def assign_type(self): + return self + + def _get_filtered_stmts(self, lookup_node, node, _stmts, mystmt): + """method used in filter_stmts""" + if self is mystmt: + return _stmts, True + if self.statement() is mystmt: + # original node's statement is the assignment, only keep + # current node (gen exp, list comp) + return [node], True + return _stmts, False + + +class ParentAssignTypeMixin(AssignTypeMixin): + def assign_type(self): + return self.parent.assign_type() + + +class ImportFromMixin(FilterStmtsMixin): + """MixIn for From and Import Nodes""" + + def _infer_name(self, frame, name): + return name + + def do_import_module(self, modname=None): + """return the ast for a module whose name is imported by + """ + # handle special case where we are on a package node importing a module + # using the same name as the package, which may end in an infinite loop + # on relative imports + # XXX: no more needed ? + mymodule = self.root() + level = getattr(self, "level", None) # Import as no level + if modname is None: + modname = self.modname + # XXX we should investigate deeper if we really want to check + # importing itself: modname and mymodule.name be relative or absolute + if mymodule.relative_to_absolute_name(modname, level) == mymodule.name: + # FIXME: we used to raise InferenceError here, but why ? + return mymodule + + return mymodule.import_module( + modname, level=level, relative_only=level and level >= 1 + ) + + def real_name(self, asname): + """get name from 'as' name""" + for name, _asname in self.names: + if name == "*": + return asname + if not _asname: + name = name.split(".", 1)[0] + _asname = name + if asname == _asname: + return name + raise exceptions.AttributeInferenceError( + "Could not find original name for {attribute} in {target!r}", + target=self, + attribute=asname, + ) + + +class MultiLineBlockMixin: + """Mixin for nodes with multi-line blocks, e.g. For and FunctionDef. + Note that this does not apply to every node with a `body` field. + For instance, an If node has a multi-line body, but the body of an + IfExpr is not multi-line, and hence cannot contain Return nodes, + Assign nodes, etc. + """ + + @decorators.cachedproperty + def _multi_line_blocks(self): + return tuple(getattr(self, field) for field in self._multi_line_block_fields) + + def _get_return_nodes_skip_functions(self): + for block in self._multi_line_blocks: + for child_node in block: + if child_node.is_function: + continue + yield from child_node._get_return_nodes_skip_functions() + + def _get_yield_nodes_skip_lambdas(self): + for block in self._multi_line_blocks: + for child_node in block: + if child_node.is_lambda: + continue + yield from child_node._get_yield_nodes_skip_lambdas() + + @decorators.cached + def _get_assign_nodes(self): + children_assign_nodes = ( + child_node._get_assign_nodes() + for block in self._multi_line_blocks + for child_node in block + ) + return list(itertools.chain.from_iterable(children_assign_nodes)) + + +class NoChildrenMixin: + """Mixin for nodes with no children, e.g. Pass.""" + + def get_children(self): + yield from () diff --git a/venv/lib/python3.7/site-packages/astroid/modutils.py b/venv/lib/python3.7/site-packages/astroid/modutils.py new file mode 100644 index 0000000..4e6f918 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/modutils.py @@ -0,0 +1,704 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2014 Denis Laxalde +# Copyright (c) 2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2015 Radosław Ganczarek +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2016 Ceridwen +# Copyright (c) 2018 Mario Corchero +# Copyright (c) 2018 Mario Corchero +# Copyright (c) 2018 Anthony Sottile + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Python modules manipulation utility functions. + +:type PY_SOURCE_EXTS: tuple(str) +:var PY_SOURCE_EXTS: list of possible python source file extension + +:type STD_LIB_DIRS: set of str +:var STD_LIB_DIRS: directories where standard modules are located + +:type BUILTIN_MODULES: dict +:var BUILTIN_MODULES: dictionary with builtin module names has key +""" +import imp +import os +import platform +import sys +import itertools +from distutils.sysconfig import get_python_lib # pylint: disable=import-error + +# pylint: disable=import-error, no-name-in-module +from distutils.errors import DistutilsPlatformError + +# distutils is replaced by virtualenv with a module that does +# weird path manipulations in order to get to the +# real distutils module. + +from .interpreter._import import spec +from .interpreter._import import util + +if sys.platform.startswith("win"): + PY_SOURCE_EXTS = ("py", "pyw") + PY_COMPILED_EXTS = ("dll", "pyd") +else: + PY_SOURCE_EXTS = ("py",) + PY_COMPILED_EXTS = ("so",) + + +try: + # The explicit sys.prefix is to work around a patch in virtualenv that + # replaces the 'real' sys.prefix (i.e. the location of the binary) + # with the prefix from which the virtualenv was created. This throws + # off the detection logic for standard library modules, thus the + # workaround. + STD_LIB_DIRS = { + get_python_lib(standard_lib=True, prefix=sys.prefix), + # Take care of installations where exec_prefix != prefix. + get_python_lib(standard_lib=True, prefix=sys.exec_prefix), + get_python_lib(standard_lib=True), + } +# get_python_lib(standard_lib=1) is not available on pypy, set STD_LIB_DIR to +# non-valid path, see https://bugs.pypy.org/issue1164 +except DistutilsPlatformError: + STD_LIB_DIRS = set() + +if os.name == "nt": + STD_LIB_DIRS.add(os.path.join(sys.prefix, "dlls")) + try: + # real_prefix is defined when running inside virtual environments, + # created with the **virtualenv** library. + STD_LIB_DIRS.add(os.path.join(sys.real_prefix, "dlls")) + except AttributeError: + # sys.base_exec_prefix is always defined, but in a virtual environment + # created with the stdlib **venv** module, it points to the original + # installation, if the virtual env is activated. + try: + STD_LIB_DIRS.add(os.path.join(sys.base_exec_prefix, "dlls")) + except AttributeError: + pass + +if platform.python_implementation() == "PyPy": + _root = os.path.join(sys.prefix, "lib_pypy") + STD_LIB_DIRS.add(_root) + try: + # real_prefix is defined when running inside virtualenv. + STD_LIB_DIRS.add(os.path.join(sys.real_prefix, "lib_pypy")) + except AttributeError: + pass + del _root +if os.name == "posix": + # Need the real prefix is we're under a virtualenv, otherwise + # the usual one will do. + try: + prefix = sys.real_prefix + except AttributeError: + prefix = sys.prefix + + def _posix_path(path): + base_python = "python%d.%d" % sys.version_info[:2] + return os.path.join(prefix, path, base_python) + + STD_LIB_DIRS.add(_posix_path("lib")) + if sys.maxsize > 2 ** 32: + # This tries to fix a problem with /usr/lib64 builds, + # where systems are running both 32-bit and 64-bit code + # on the same machine, which reflects into the places where + # standard library could be found. More details can be found + # here http://bugs.python.org/issue1294959. + # An easy reproducing case would be + # https://github.com/PyCQA/pylint/issues/712#issuecomment-163178753 + STD_LIB_DIRS.add(_posix_path("lib64")) + +EXT_LIB_DIR = get_python_lib() +IS_JYTHON = platform.python_implementation() == "Jython" +BUILTIN_MODULES = dict.fromkeys(sys.builtin_module_names, True) + + +class NoSourceFile(Exception): + """exception raised when we are not able to get a python + source file for a precompiled file + """ + + +def _normalize_path(path): + return os.path.normcase(os.path.abspath(path)) + + +def _canonicalize_path(path): + return os.path.realpath(os.path.expanduser(path)) + + +def _path_from_filename(filename, is_jython=IS_JYTHON): + if not is_jython: + if sys.version_info > (3, 0): + return filename + if filename.endswith(".pyc"): + return filename[:-1] + return filename + head, has_pyclass, _ = filename.partition("$py.class") + if has_pyclass: + return head + ".py" + return filename + + +def _handle_blacklist(blacklist, dirnames, filenames): + """remove files/directories in the black list + + dirnames/filenames are usually from os.walk + """ + for norecurs in blacklist: + if norecurs in dirnames: + dirnames.remove(norecurs) + elif norecurs in filenames: + filenames.remove(norecurs) + + +_NORM_PATH_CACHE = {} + + +def _cache_normalize_path(path): + """abspath with caching""" + # _module_file calls abspath on every path in sys.path every time it's + # called; on a larger codebase this easily adds up to half a second just + # assembling path components. This cache alleviates that. + try: + return _NORM_PATH_CACHE[path] + except KeyError: + if not path: # don't cache result for '' + return _normalize_path(path) + result = _NORM_PATH_CACHE[path] = _normalize_path(path) + return result + + +def load_module_from_name(dotted_name, path=None, use_sys=True): + """Load a Python module from its name. + + :type dotted_name: str + :param dotted_name: python name of a module or package + + :type path: list or None + :param path: + optional list of path where the module or package should be + searched (use sys.path if nothing or None is given) + + :type use_sys: bool + :param use_sys: + boolean indicating whether the sys.modules dictionary should be + used or not + + + :raise ImportError: if the module or package is not found + + :rtype: module + :return: the loaded module + """ + return load_module_from_modpath(dotted_name.split("."), path, use_sys) + + +def load_module_from_modpath(parts, path=None, use_sys=1): + """Load a python module from its split name. + + :type parts: list(str) or tuple(str) + :param parts: + python name of a module or package split on '.' + + :type path: list or None + :param path: + optional list of path where the module or package should be + searched (use sys.path if nothing or None is given) + + :type use_sys: bool + :param use_sys: + boolean indicating whether the sys.modules dictionary should be used or not + + :raise ImportError: if the module or package is not found + + :rtype: module + :return: the loaded module + """ + if use_sys: + try: + return sys.modules[".".join(parts)] + except KeyError: + pass + modpath = [] + prevmodule = None + for part in parts: + modpath.append(part) + curname = ".".join(modpath) + module = None + if len(modpath) != len(parts): + # even with use_sys=False, should try to get outer packages from sys.modules + module = sys.modules.get(curname) + elif use_sys: + # because it may have been indirectly loaded through a parent + module = sys.modules.get(curname) + if module is None: + mp_file, mp_filename, mp_desc = imp.find_module(part, path) + module = imp.load_module(curname, mp_file, mp_filename, mp_desc) + # mp_file still needs to be closed. + if mp_file: + mp_file.close() + if prevmodule: + setattr(prevmodule, part, module) + _file = getattr(module, "__file__", "") + prevmodule = module + if not _file and util.is_namespace(curname): + continue + if not _file and len(modpath) != len(parts): + raise ImportError("no module in %s" % ".".join(parts[len(modpath) :])) + path = [os.path.dirname(_file)] + return module + + +def load_module_from_file(filepath, path=None, use_sys=True, extrapath=None): + """Load a Python module from it's path. + + :type filepath: str + :param filepath: path to the python module or package + + :type path: list or None + :param path: + optional list of path where the module or package should be + searched (use sys.path if nothing or None is given) + + :type use_sys: bool + :param use_sys: + boolean indicating whether the sys.modules dictionary should be + used or not + + + :raise ImportError: if the module or package is not found + + :rtype: module + :return: the loaded module + """ + modpath = modpath_from_file(filepath, extrapath) + return load_module_from_modpath(modpath, path, use_sys) + + +def check_modpath_has_init(path, mod_path): + """check there are some __init__.py all along the way""" + modpath = [] + for part in mod_path: + modpath.append(part) + path = os.path.join(path, part) + if not _has_init(path): + old_namespace = util.is_namespace(".".join(modpath)) + if not old_namespace: + return False + return True + + +def _get_relative_base_path(filename, path_to_check): + """Extracts the relative mod path of the file to import from + + Check if a file is within the passed in path and if so, returns the + relative mod path from the one passed in. + + If the filename is no in path_to_check, returns None + + Note this function will look for both abs and realpath of the file, + this allows to find the relative base path even if the file is a + symlink of a file in the passed in path + + Examples: + _get_relative_base_path("/a/b/c/d.py", "/a/b") -> ["c","d"] + _get_relative_base_path("/a/b/c/d.py", "/dev") -> None + """ + importable_path = None + path_to_check = os.path.normcase(path_to_check) + abs_filename = os.path.abspath(filename) + if os.path.normcase(abs_filename).startswith(path_to_check): + importable_path = abs_filename + + real_filename = os.path.realpath(filename) + if os.path.normcase(real_filename).startswith(path_to_check): + importable_path = real_filename + + if importable_path: + base_path = os.path.splitext(importable_path)[0] + relative_base_path = base_path[len(path_to_check) :] + return [pkg for pkg in relative_base_path.split(os.sep) if pkg] + + return None + + +def modpath_from_file_with_callback(filename, extrapath=None, is_package_cb=None): + filename = os.path.expanduser(_path_from_filename(filename)) + + if extrapath is not None: + for path_ in itertools.chain(map(_canonicalize_path, extrapath), extrapath): + path = os.path.abspath(path_) + if not path: + continue + submodpath = _get_relative_base_path(filename, path) + if not submodpath: + continue + if is_package_cb(path, submodpath[:-1]): + return extrapath[path_].split(".") + submodpath + + for path in itertools.chain(map(_canonicalize_path, sys.path), sys.path): + path = _cache_normalize_path(path) + if not path: + continue + modpath = _get_relative_base_path(filename, path) + if not modpath: + continue + if is_package_cb(path, modpath[:-1]): + return modpath + + raise ImportError( + "Unable to find module for %s in %s" % (filename, ", \n".join(sys.path)) + ) + + +def modpath_from_file(filename, extrapath=None): + """given a file path return the corresponding split module's name + (i.e name of a module or package split on '.') + + :type filename: str + :param filename: file's path for which we want the module's name + + :type extrapath: dict + :param extrapath: + optional extra search path, with path as key and package name for the path + as value. This is usually useful to handle package split in multiple + directories using __path__ trick. + + + :raise ImportError: + if the corresponding module's name has not been found + + :rtype: list(str) + :return: the corresponding split module's name + """ + return modpath_from_file_with_callback(filename, extrapath, check_modpath_has_init) + + +def file_from_modpath(modpath, path=None, context_file=None): + return file_info_from_modpath(modpath, path, context_file).location + + +def file_info_from_modpath(modpath, path=None, context_file=None): + """given a mod path (i.e. split module / package name), return the + corresponding file, giving priority to source file over precompiled + file if it exists + + :type modpath: list or tuple + :param modpath: + split module's name (i.e name of a module or package split + on '.') + (this means explicit relative imports that start with dots have + empty strings in this list!) + + :type path: list or None + :param path: + optional list of path where the module or package should be + searched (use sys.path if nothing or None is given) + + :type context_file: str or None + :param context_file: + context file to consider, necessary if the identifier has been + introduced using a relative import unresolvable in the actual + context (i.e. modutils) + + :raise ImportError: if there is no such module in the directory + + :rtype: (str or None, import type) + :return: + the path to the module's file or None if it's an integrated + builtin module such as 'sys' + """ + if context_file is not None: + context = os.path.dirname(context_file) + else: + context = context_file + if modpath[0] == "xml": + # handle _xmlplus + try: + return _spec_from_modpath(["_xmlplus"] + modpath[1:], path, context) + except ImportError: + return _spec_from_modpath(modpath, path, context) + elif modpath == ["os", "path"]: + # FIXME: currently ignoring search_path... + return spec.ModuleSpec( + name="os.path", location=os.path.__file__, module_type=imp.PY_SOURCE + ) + return _spec_from_modpath(modpath, path, context) + + +def get_module_part(dotted_name, context_file=None): + """given a dotted name return the module part of the name : + + >>> get_module_part('astroid.as_string.dump') + 'astroid.as_string' + + :type dotted_name: str + :param dotted_name: full name of the identifier we are interested in + + :type context_file: str or None + :param context_file: + context file to consider, necessary if the identifier has been + introduced using a relative import unresolvable in the actual + context (i.e. modutils) + + + :raise ImportError: if there is no such module in the directory + + :rtype: str or None + :return: + the module part of the name or None if we have not been able at + all to import the given name + + XXX: deprecated, since it doesn't handle package precedence over module + (see #10066) + """ + # os.path trick + if dotted_name.startswith("os.path"): + return "os.path" + parts = dotted_name.split(".") + if context_file is not None: + # first check for builtin module which won't be considered latter + # in that case (path != None) + if parts[0] in BUILTIN_MODULES: + if len(parts) > 2: + raise ImportError(dotted_name) + return parts[0] + # don't use += or insert, we want a new list to be created ! + path = None + starti = 0 + if parts[0] == "": + assert ( + context_file is not None + ), "explicit relative import, but no context_file?" + path = [] # prevent resolving the import non-relatively + starti = 1 + while parts[starti] == "": # for all further dots: change context + starti += 1 + context_file = os.path.dirname(context_file) + for i in range(starti, len(parts)): + try: + file_from_modpath( + parts[starti : i + 1], path=path, context_file=context_file + ) + except ImportError: + if i < max(1, len(parts) - 2): + raise + return ".".join(parts[:i]) + return dotted_name + + +def get_module_files(src_directory, blacklist, list_all=False): + """given a package directory return a list of all available python + module's files in the package and its subpackages + + :type src_directory: str + :param src_directory: + path of the directory corresponding to the package + + :type blacklist: list or tuple + :param blacklist: iterable + list of files or directories to ignore. + + :type list_all: bool + :param list_all: + get files from all paths, including ones without __init__.py + + :rtype: list + :return: + the list of all available python module's files in the package and + its subpackages + """ + files = [] + for directory, dirnames, filenames in os.walk(src_directory): + if directory in blacklist: + continue + _handle_blacklist(blacklist, dirnames, filenames) + # check for __init__.py + if not list_all and "__init__.py" not in filenames: + dirnames[:] = () + continue + for filename in filenames: + if _is_python_file(filename): + src = os.path.join(directory, filename) + files.append(src) + return files + + +def get_source_file(filename, include_no_ext=False): + """given a python module's file name return the matching source file + name (the filename will be returned identically if it's already an + absolute path to a python source file...) + + :type filename: str + :param filename: python module's file name + + + :raise NoSourceFile: if no source file exists on the file system + + :rtype: str + :return: the absolute path of the source file if it exists + """ + filename = os.path.abspath(_path_from_filename(filename)) + base, orig_ext = os.path.splitext(filename) + for ext in PY_SOURCE_EXTS: + source_path = "%s.%s" % (base, ext) + if os.path.exists(source_path): + return source_path + if include_no_ext and not orig_ext and os.path.exists(base): + return base + raise NoSourceFile(filename) + + +def is_python_source(filename): + """ + rtype: bool + return: True if the filename is a python source file + """ + return os.path.splitext(filename)[1][1:] in PY_SOURCE_EXTS + + +def is_standard_module(modname, std_path=None): + """try to guess if a module is a standard python module (by default, + see `std_path` parameter's description) + + :type modname: str + :param modname: name of the module we are interested in + + :type std_path: list(str) or tuple(str) + :param std_path: list of path considered has standard + + + :rtype: bool + :return: + true if the module: + - is located on the path listed in one of the directory in `std_path` + - is a built-in module + """ + modname = modname.split(".")[0] + try: + filename = file_from_modpath([modname]) + except ImportError: + # import failed, i'm probably not so wrong by supposing it's + # not standard... + return False + # modules which are not living in a file are considered standard + # (sys and __builtin__ for instance) + if filename is None: + # we assume there are no namespaces in stdlib + return not util.is_namespace(modname) + filename = _normalize_path(filename) + if filename.startswith(_cache_normalize_path(EXT_LIB_DIR)): + return False + if std_path is None: + std_path = STD_LIB_DIRS + for path in std_path: + if filename.startswith(_cache_normalize_path(path)): + return True + return False + + +def is_relative(modname, from_file): + """return true if the given module name is relative to the given + file name + + :type modname: str + :param modname: name of the module we are interested in + + :type from_file: str + :param from_file: + path of the module from which modname has been imported + + :rtype: bool + :return: + true if the module has been imported relatively to `from_file` + """ + if not os.path.isdir(from_file): + from_file = os.path.dirname(from_file) + if from_file in sys.path: + return False + try: + stream, _, _ = imp.find_module(modname.split(".")[0], [from_file]) + + # Close the stream to avoid ResourceWarnings. + if stream: + stream.close() + return True + except ImportError: + return False + + +# internal only functions ##################################################### + + +def _spec_from_modpath(modpath, path=None, context=None): + """given a mod path (i.e. split module / package name), return the + corresponding spec + + this function is used internally, see `file_from_modpath`'s + documentation for more information + """ + assert modpath + location = None + if context is not None: + try: + found_spec = spec.find_spec(modpath, [context]) + location = found_spec.location + except ImportError: + found_spec = spec.find_spec(modpath, path) + location = found_spec.location + else: + found_spec = spec.find_spec(modpath, path) + if found_spec.type == spec.ModuleType.PY_COMPILED: + try: + location = get_source_file(found_spec.location) + return found_spec._replace( + location=location, type=spec.ModuleType.PY_SOURCE + ) + except NoSourceFile: + return found_spec._replace(location=location) + elif found_spec.type == spec.ModuleType.C_BUILTIN: + # integrated builtin module + return found_spec._replace(location=None) + elif found_spec.type == spec.ModuleType.PKG_DIRECTORY: + location = _has_init(found_spec.location) + return found_spec._replace(location=location, type=spec.ModuleType.PY_SOURCE) + return found_spec + + +def _is_python_file(filename): + """return true if the given filename should be considered as a python file + + .pyc and .pyo are ignored + """ + for ext in (".py", ".so", ".pyd", ".pyw"): + if filename.endswith(ext): + return True + return False + + +def _has_init(directory): + """if the given directory has a valid __init__ file, return its path, + else return None + """ + mod_or_pack = os.path.join(directory, "__init__") + for ext in PY_SOURCE_EXTS + ("pyc", "pyo"): + if os.path.exists(mod_or_pack + "." + ext): + return mod_or_pack + "." + ext + return None + + +def is_namespace(specobj): + return specobj.type == spec.ModuleType.PY_NAMESPACE + + +def is_directory(specobj): + return specobj.type == spec.ModuleType.PKG_DIRECTORY diff --git a/venv/lib/python3.7/site-packages/astroid/node_classes.py b/venv/lib/python3.7/site-packages/astroid/node_classes.py new file mode 100644 index 0000000..204d802 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/node_classes.py @@ -0,0 +1,4697 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2009-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2010 Daniel Harding +# Copyright (c) 2012 FELD Boris +# Copyright (c) 2013-2014 Google, Inc. +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2016-2017 Derek Gustafson +# Copyright (c) 2016 Jared Garst +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2016 Dave Baum +# Copyright (c) 2017-2018 Ashley Whetter +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2017 rr- +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 brendanator +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 HoverHell + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +# pylint: disable=too-many-lines; https://github.com/PyCQA/astroid/issues/465 + +"""Module for some node classes. More nodes in scoped_nodes.py +""" + +import abc +import builtins as builtins_mod +import itertools +import pprint +from functools import lru_cache +from functools import singledispatch as _singledispatch + +from astroid import as_string +from astroid import bases +from astroid import context as contextmod +from astroid import decorators +from astroid import exceptions +from astroid import manager +from astroid import mixins +from astroid import util + + +BUILTINS = builtins_mod.__name__ +MANAGER = manager.AstroidManager() + + +@decorators.raise_if_nothing_inferred +def unpack_infer(stmt, context=None): + """recursively generate nodes inferred by the given statement. + If the inferred value is a list or a tuple, recurse on the elements + """ + if isinstance(stmt, (List, Tuple)): + for elt in stmt.elts: + if elt is util.Uninferable: + yield elt + continue + yield from unpack_infer(elt, context) + return dict(node=stmt, context=context) + # if inferred is a final node, return it and stop + inferred = next(stmt.infer(context)) + if inferred is stmt: + yield inferred + return dict(node=stmt, context=context) + # else, infer recursively, except Uninferable object that should be returned as is + for inferred in stmt.infer(context): + if inferred is util.Uninferable: + yield inferred + else: + yield from unpack_infer(inferred, context) + + return dict(node=stmt, context=context) + + +def are_exclusive( + stmt1, stmt2, exceptions=None +): # pylint: disable=redefined-outer-name + """return true if the two given statements are mutually exclusive + + `exceptions` may be a list of exception names. If specified, discard If + branches and check one of the statement is in an exception handler catching + one of the given exceptions. + + algorithm : + 1) index stmt1's parents + 2) climb among stmt2's parents until we find a common parent + 3) if the common parent is a If or TryExcept statement, look if nodes are + in exclusive branches + """ + # index stmt1's parents + stmt1_parents = {} + children = {} + node = stmt1.parent + previous = stmt1 + while node: + stmt1_parents[node] = 1 + children[node] = previous + previous = node + node = node.parent + # climb among stmt2's parents until we find a common parent + node = stmt2.parent + previous = stmt2 + while node: + if node in stmt1_parents: + # if the common parent is a If or TryExcept statement, look if + # nodes are in exclusive branches + if isinstance(node, If) and exceptions is None: + if ( + node.locate_child(previous)[1] + is not node.locate_child(children[node])[1] + ): + return True + elif isinstance(node, TryExcept): + c2attr, c2node = node.locate_child(previous) + c1attr, c1node = node.locate_child(children[node]) + if c1node is not c2node: + first_in_body_caught_by_handlers = ( + c2attr == "handlers" + and c1attr == "body" + and previous.catch(exceptions) + ) + second_in_body_caught_by_handlers = ( + c2attr == "body" + and c1attr == "handlers" + and children[node].catch(exceptions) + ) + first_in_else_other_in_handlers = ( + c2attr == "handlers" and c1attr == "orelse" + ) + second_in_else_other_in_handlers = ( + c2attr == "orelse" and c1attr == "handlers" + ) + if any( + ( + first_in_body_caught_by_handlers, + second_in_body_caught_by_handlers, + first_in_else_other_in_handlers, + second_in_else_other_in_handlers, + ) + ): + return True + elif c2attr == "handlers" and c1attr == "handlers": + return previous is not children[node] + return False + previous = node + node = node.parent + return False + + +# getitem() helpers. + +_SLICE_SENTINEL = object() + + +def _slice_value(index, context=None): + """Get the value of the given slice index.""" + + if isinstance(index, Const): + if isinstance(index.value, (int, type(None))): + return index.value + elif index is None: + return None + else: + # Try to infer what the index actually is. + # Since we can't return all the possible values, + # we'll stop at the first possible value. + try: + inferred = next(index.infer(context=context)) + except exceptions.InferenceError: + pass + else: + if isinstance(inferred, Const): + if isinstance(inferred.value, (int, type(None))): + return inferred.value + + # Use a sentinel, because None can be a valid + # value that this function can return, + # as it is the case for unspecified bounds. + return _SLICE_SENTINEL + + +def _infer_slice(node, context=None): + lower = _slice_value(node.lower, context) + upper = _slice_value(node.upper, context) + step = _slice_value(node.step, context) + if all(elem is not _SLICE_SENTINEL for elem in (lower, upper, step)): + return slice(lower, upper, step) + + raise exceptions.AstroidTypeError( + message="Could not infer slice used in subscript", + node=node, + index=node.parent, + context=context, + ) + + +def _container_getitem(instance, elts, index, context=None): + """Get a slice or an item, using the given *index*, for the given sequence.""" + try: + if isinstance(index, Slice): + index_slice = _infer_slice(index, context=context) + new_cls = instance.__class__() + new_cls.elts = elts[index_slice] + new_cls.parent = instance.parent + return new_cls + if isinstance(index, Const): + return elts[index.value] + except IndexError as exc: + raise exceptions.AstroidIndexError( + message="Index {index!s} out of range", + node=instance, + index=index, + context=context, + ) from exc + except TypeError as exc: + raise exceptions.AstroidTypeError( + message="Type error {error!r}", node=instance, index=index, context=context + ) from exc + + raise exceptions.AstroidTypeError("Could not use %s as subscript index" % index) + + +OP_PRECEDENCE = { + op: precedence + for precedence, ops in enumerate( + [ + ["Lambda"], # lambda x: x + 1 + ["IfExp"], # 1 if True else 2 + ["or"], + ["and"], + ["not"], + ["Compare"], # in, not in, is, is not, <, <=, >, >=, !=, == + ["|"], + ["^"], + ["&"], + ["<<", ">>"], + ["+", "-"], + ["*", "@", "/", "//", "%"], + ["UnaryOp"], # +, -, ~ + ["**"], + ["Await"], + ] + ) + for op in ops +} + + +class NodeNG: + """ A node of the new Abstract Syntax Tree (AST). + + This is the base class for all Astroid node classes. + """ + + is_statement = False + """Whether this node indicates a statement. + + :type: bool + """ + optional_assign = False # True for For (and for Comprehension if py <3.0) + """Whether this node optionally assigns a variable. + + This is for loop assignments because loop won't necessarily perform an + assignment if the loop has no iterations. + This is also the case from comprehensions in Python 2. + + :type: bool + """ + is_function = False # True for FunctionDef nodes + """Whether this node indicates a function. + + :type: bool + """ + is_lambda = False + # Attributes below are set by the builder module or by raw factories + lineno = None + """The line that this node appears on in the source code. + + :type: int or None + """ + col_offset = None + """The column that this node appears on in the source code. + + :type: int or None + """ + parent = None + """The parent node in the syntax tree. + + :type: NodeNG or None + """ + _astroid_fields = () + """Node attributes that contain child nodes. + + This is redefined in most concrete classes. + + :type: tuple(str) + """ + _other_fields = () + """Node attributes that do not contain child nodes. + + :type: tuple(str) + """ + _other_other_fields = () + """Attributes that contain AST-dependent fields. + + :type: tuple(str) + """ + # instance specific inference function infer(node, context) + _explicit_inference = None + + def __init__(self, lineno=None, col_offset=None, parent=None): + """ + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.lineno = lineno + self.col_offset = col_offset + self.parent = parent + + def infer(self, context=None, **kwargs): + """Get a generator of the inferred values. + + This is the main entry point to the inference system. + + .. seealso:: :ref:`inference` + + If the instance has some explicit inference function set, it will be + called instead of the default interface. + + :returns: The inferred values. + :rtype: iterable + """ + if context is not None: + context = context.extra_context.get(self, context) + if self._explicit_inference is not None: + # explicit_inference is not bound, give it self explicitly + try: + # pylint: disable=not-callable + return self._explicit_inference(self, context, **kwargs) + except exceptions.UseInferenceDefault: + pass + + if not context: + return self._infer(context, **kwargs) + + key = (self, context.lookupname, context.callcontext, context.boundnode) + if key in context.inferred: + return iter(context.inferred[key]) + + gen = context.cache_generator(key, self._infer(context, **kwargs)) + return util.limit_inference(gen, MANAGER.max_inferable_values) + + def _repr_name(self): + """Get a name for nice representation. + + This is either :attr:`name`, :attr:`attrname`, or the empty string. + + :returns: The nice name. + :rtype: str + """ + names = {"name", "attrname"} + if all(name not in self._astroid_fields for name in names): + return getattr(self, "name", getattr(self, "attrname", "")) + return "" + + def __str__(self): + rname = self._repr_name() + cname = type(self).__name__ + if rname: + string = "%(cname)s.%(rname)s(%(fields)s)" + alignment = len(cname) + len(rname) + 2 + else: + string = "%(cname)s(%(fields)s)" + alignment = len(cname) + 1 + result = [] + for field in self._other_fields + self._astroid_fields: + value = getattr(self, field) + width = 80 - len(field) - alignment + lines = pprint.pformat(value, indent=2, width=width).splitlines(True) + + inner = [lines[0]] + for line in lines[1:]: + inner.append(" " * alignment + line) + result.append("%s=%s" % (field, "".join(inner))) + + return string % { + "cname": cname, + "rname": rname, + "fields": (",\n" + " " * alignment).join(result), + } + + def __repr__(self): + rname = self._repr_name() + if rname: + string = "<%(cname)s.%(rname)s l.%(lineno)s at 0x%(id)x>" + else: + string = "<%(cname)s l.%(lineno)s at 0x%(id)x>" + return string % { + "cname": type(self).__name__, + "rname": rname, + "lineno": self.fromlineno, + "id": id(self), + } + + def accept(self, visitor): + """Visit this node using the given visitor.""" + func = getattr(visitor, "visit_" + self.__class__.__name__.lower()) + return func(self) + + def get_children(self): + """Get the child nodes below this node. + + :returns: The children. + :rtype: iterable(NodeNG) + """ + for field in self._astroid_fields: + attr = getattr(self, field) + if attr is None: + continue + if isinstance(attr, (list, tuple)): + yield from attr + else: + yield attr + + def last_child(self): + """An optimized version of list(get_children())[-1] + + :returns: The last child, or None if no children exist. + :rtype: NodeNG or None + """ + for field in self._astroid_fields[::-1]: + attr = getattr(self, field) + if not attr: # None or empty listy / tuple + continue + if isinstance(attr, (list, tuple)): + return attr[-1] + + return attr + return None + + def parent_of(self, node): + """Check if this node is the parent of the given node. + + :param node: The node to check if it is the child. + :type node: NodeNG + + :returns: True if this node is the parent of the given node, + False otherwise. + :rtype: bool + """ + parent = node.parent + while parent is not None: + if self is parent: + return True + parent = parent.parent + return False + + def statement(self): + """The first parent node, including self, marked as statement node. + + :returns: The first parent statement. + :rtype: NodeNG + """ + if self.is_statement: + return self + return self.parent.statement() + + def frame(self): + """The first parent frame node. + + A frame node is a :class:`Module`, :class:`FunctionDef`, + or :class:`ClassDef`. + + :returns: The first parent frame node. + :rtype: Module or FunctionDef or ClassDef + """ + return self.parent.frame() + + def scope(self): + """The first parent node defining a new scope. + + :returns: The first parent scope node. + :rtype: Module or FunctionDef or ClassDef or Lambda or GenExpr + """ + return self.parent.scope() + + def root(self): + """Return the root node of the syntax tree. + + :returns: The root node. + :rtype: Module + """ + if self.parent: + return self.parent.root() + return self + + def child_sequence(self, child): + """Search for the sequence that contains this child. + + :param child: The child node to search sequences for. + :type child: NodeNG + + :returns: The sequence containing the given child node. + :rtype: iterable(NodeNG) + + :raises AstroidError: If no sequence could be found that contains + the given child. + """ + for field in self._astroid_fields: + node_or_sequence = getattr(self, field) + if node_or_sequence is child: + return [node_or_sequence] + # /!\ compiler.ast Nodes have an __iter__ walking over child nodes + if ( + isinstance(node_or_sequence, (tuple, list)) + and child in node_or_sequence + ): + return node_or_sequence + + msg = "Could not find %s in %s's children" + raise exceptions.AstroidError(msg % (repr(child), repr(self))) + + def locate_child(self, child): + """Find the field of this node that contains the given child. + + :param child: The child node to search fields for. + :type child: NodeNG + + :returns: A tuple of the name of the field that contains the child, + and the sequence or node that contains the child node. + :rtype: tuple(str, iterable(NodeNG) or NodeNG) + + :raises AstroidError: If no field could be found that contains + the given child. + """ + for field in self._astroid_fields: + node_or_sequence = getattr(self, field) + # /!\ compiler.ast Nodes have an __iter__ walking over child nodes + if child is node_or_sequence: + return field, child + if ( + isinstance(node_or_sequence, (tuple, list)) + and child in node_or_sequence + ): + return field, node_or_sequence + msg = "Could not find %s in %s's children" + raise exceptions.AstroidError(msg % (repr(child), repr(self))) + + # FIXME : should we merge child_sequence and locate_child ? locate_child + # is only used in are_exclusive, child_sequence one time in pylint. + + def next_sibling(self): + """The next sibling statement node. + + :returns: The next sibling statement node. + :rtype: NodeNG or None + """ + return self.parent.next_sibling() + + def previous_sibling(self): + """The previous sibling statement. + + :returns: The previous sibling statement node. + :rtype: NodeNG or None + """ + return self.parent.previous_sibling() + + def nearest(self, nodes): + """Get the node closest to this one from the given list of nodes. + + :param nodes: The list of nodes to search. All of these nodes must + belong to the same module as this one. The list should be + sorted by the line number of the nodes, smallest first. + :type nodes: iterable(NodeNG) + + :returns: The node closest to this one in the source code, + or None if one could not be found. + :rtype: NodeNG or None + """ + myroot = self.root() + mylineno = self.fromlineno + nearest = None, 0 + for node in nodes: + assert node.root() is myroot, ( + "nodes %s and %s are not from the same module" % (self, node) + ) + lineno = node.fromlineno + if node.fromlineno > mylineno: + break + if lineno > nearest[1]: + nearest = node, lineno + # FIXME: raise an exception if nearest is None ? + return nearest[0] + + # these are lazy because they're relatively expensive to compute for every + # single node, and they rarely get looked at + + @decorators.cachedproperty + def fromlineno(self): + """The first line that this node appears on in the source code. + + :type: int or None + """ + if self.lineno is None: + return self._fixed_source_line() + + return self.lineno + + @decorators.cachedproperty + def tolineno(self): + """The last line that this node appears on in the source code. + + :type: int or None + """ + if not self._astroid_fields: + # can't have children + lastchild = None + else: + lastchild = self.last_child() + if lastchild is None: + return self.fromlineno + + return lastchild.tolineno + + def _fixed_source_line(self): + """Attempt to find the line that this node appears on. + + We need this method since not all nodes have :attr:`lineno` set. + + :returns: The line number of this node, + or None if this could not be determined. + :rtype: int or None + """ + line = self.lineno + _node = self + try: + while line is None: + _node = next(_node.get_children()) + line = _node.lineno + except StopIteration: + _node = self.parent + while _node and line is None: + line = _node.lineno + _node = _node.parent + return line + + def block_range(self, lineno): + """Get a range from the given line number to where this node ends. + + :param lineno: The line number to start the range at. + :type lineno: int + + :returns: The range of line numbers that this node belongs to, + starting at the given line number. + :rtype: tuple(int, int or None) + """ + return lineno, self.tolineno + + def set_local(self, name, stmt): + """Define that the given name is declared in the given statement node. + + This definition is stored on the parent scope node. + + .. seealso:: :meth:`scope` + + :param name: The name that is being defined. + :type name: str + + :param stmt: The statement that defines the given name. + :type stmt: NodeNG + """ + self.parent.set_local(name, stmt) + + def nodes_of_class(self, klass, skip_klass=None): + """Get the nodes (including this one or below) of the given type. + + :param klass: The type of node to search for. + :type klass: builtins.type + + :param skip_klass: A type of node to ignore. This is useful to ignore + subclasses of :attr:`klass`. + :type skip_klass: builtins.type + + :returns: The node of the given type. + :rtype: iterable(NodeNG) + """ + if isinstance(self, klass): + yield self + + if skip_klass is None: + for child_node in self.get_children(): + yield from child_node.nodes_of_class(klass, skip_klass) + + return + + for child_node in self.get_children(): + if isinstance(child_node, skip_klass): + continue + yield from child_node.nodes_of_class(klass, skip_klass) + + @decorators.cached + def _get_assign_nodes(self): + return [] + + def _get_name_nodes(self): + for child_node in self.get_children(): + yield from child_node._get_name_nodes() + + def _get_return_nodes_skip_functions(self): + yield from () + + def _get_yield_nodes_skip_lambdas(self): + yield from () + + def _infer_name(self, frame, name): + # overridden for ImportFrom, Import, Global, TryExcept and Arguments + pass + + def _infer(self, context=None): + """we don't know how to resolve a statement by default""" + # this method is overridden by most concrete classes + raise exceptions.InferenceError( + "No inference function for {node!r}.", node=self, context=context + ) + + def inferred(self): + """Get a list of the inferred values. + + .. seealso:: :ref:`inference` + + :returns: The inferred values. + :rtype: list + """ + return list(self.infer()) + + def instantiate_class(self): + """Instantiate an instance of the defined class. + + .. note:: + + On anything other than a :class:`ClassDef` this will return self. + + :returns: An instance of the defined class. + :rtype: object + """ + return self + + def has_base(self, node): + """Check if this node inherits from the given type. + + :param node: The node defining the base to look for. + Usually this is a :class:`Name` node. + :type node: NodeNG + """ + return False + + def callable(self): + """Whether this node defines something that is callable. + + :returns: True if this defines something that is callable, + False otherwise. + :rtype: bool + """ + return False + + def eq(self, value): + return False + + def as_string(self): + """Get the source code that this node represents. + + :returns: The source code. + :rtype: str + """ + return as_string.to_code(self) + + def repr_tree( + self, + ids=False, + include_linenos=False, + ast_state=False, + indent=" ", + max_depth=0, + max_width=80, + ): + """Get a string representation of the AST from this node. + + :param ids: If true, includes the ids with the node type names. + :type ids: bool + + :param include_linenos: If true, includes the line numbers and + column offsets. + :type include_linenos: bool + + :param ast_state: If true, includes information derived from + the whole AST like local and global variables. + :type ast_state: bool + + :param indent: A string to use to indent the output string. + :type indent: str + + :param max_depth: If set to a positive integer, won't return + nodes deeper than max_depth in the string. + :type max_depth: int + + :param max_width: Attempt to format the output string to stay + within this number of characters, but can exceed it under some + circumstances. Only positive integer values are valid, the default is 80. + :type max_width: int + + :returns: The string representation of the AST. + :rtype: str + """ + # pylint: disable=too-many-statements + @_singledispatch + def _repr_tree(node, result, done, cur_indent="", depth=1): + """Outputs a representation of a non-tuple/list, non-node that's + contained within an AST, including strings. + """ + lines = pprint.pformat( + node, width=max(max_width - len(cur_indent), 1) + ).splitlines(True) + result.append(lines[0]) + result.extend([cur_indent + line for line in lines[1:]]) + return len(lines) != 1 + + # pylint: disable=unused-variable; doesn't understand singledispatch + @_repr_tree.register(tuple) + @_repr_tree.register(list) + def _repr_seq(node, result, done, cur_indent="", depth=1): + """Outputs a representation of a sequence that's contained within an AST.""" + cur_indent += indent + result.append("[") + if not node: + broken = False + elif len(node) == 1: + broken = _repr_tree(node[0], result, done, cur_indent, depth) + elif len(node) == 2: + broken = _repr_tree(node[0], result, done, cur_indent, depth) + if not broken: + result.append(", ") + else: + result.append(",\n") + result.append(cur_indent) + broken = _repr_tree(node[1], result, done, cur_indent, depth) or broken + else: + result.append("\n") + result.append(cur_indent) + for child in node[:-1]: + _repr_tree(child, result, done, cur_indent, depth) + result.append(",\n") + result.append(cur_indent) + _repr_tree(node[-1], result, done, cur_indent, depth) + broken = True + result.append("]") + return broken + + # pylint: disable=unused-variable; doesn't understand singledispatch + @_repr_tree.register(NodeNG) + def _repr_node(node, result, done, cur_indent="", depth=1): + """Outputs a strings representation of an astroid node.""" + if node in done: + result.append( + indent + + " max_depth: + result.append("...") + return False + depth += 1 + cur_indent += indent + if ids: + result.append("%s<0x%x>(\n" % (type(node).__name__, id(node))) + else: + result.append("%s(" % type(node).__name__) + fields = [] + if include_linenos: + fields.extend(("lineno", "col_offset")) + fields.extend(node._other_fields) + fields.extend(node._astroid_fields) + if ast_state: + fields.extend(node._other_other_fields) + if not fields: + broken = False + elif len(fields) == 1: + result.append("%s=" % fields[0]) + broken = _repr_tree( + getattr(node, fields[0]), result, done, cur_indent, depth + ) + else: + result.append("\n") + result.append(cur_indent) + for field in fields[:-1]: + result.append("%s=" % field) + _repr_tree(getattr(node, field), result, done, cur_indent, depth) + result.append(",\n") + result.append(cur_indent) + result.append("%s=" % fields[-1]) + _repr_tree(getattr(node, fields[-1]), result, done, cur_indent, depth) + broken = True + result.append(")") + return broken + + result = [] + _repr_tree(self, result, set()) + return "".join(result) + + def bool_value(self): + """Determine the boolean value of this node. + + The boolean value of a node can have three + possible values: + + * False: For instance, empty data structures, + False, empty strings, instances which return + explicitly False from the __nonzero__ / __bool__ + method. + * True: Most of constructs are True by default: + classes, functions, modules etc + * Uninferable: The inference engine is uncertain of the + node's value. + + :returns: The boolean value of this node. + :rtype: bool or Uninferable + """ + return util.Uninferable + + def op_precedence(self): + # Look up by class name or default to highest precedence + return OP_PRECEDENCE.get(self.__class__.__name__, len(OP_PRECEDENCE)) + + def op_left_associative(self): + # Everything is left associative except `**` and IfExp + return True + + +class Statement(NodeNG): + """Statement node adding a few attributes""" + + is_statement = True + """Whether this node indicates a statement. + + :type: bool + """ + + def next_sibling(self): + """The next sibling statement node. + + :returns: The next sibling statement node. + :rtype: NodeNG or None + """ + stmts = self.parent.child_sequence(self) + index = stmts.index(self) + try: + return stmts[index + 1] + except IndexError: + pass + + def previous_sibling(self): + """The previous sibling statement. + + :returns: The previous sibling statement node. + :rtype: NodeNG or None + """ + stmts = self.parent.child_sequence(self) + index = stmts.index(self) + if index >= 1: + return stmts[index - 1] + return None + + +class _BaseContainer( + mixins.ParentAssignTypeMixin, NodeNG, bases.Instance, metaclass=abc.ABCMeta +): + """Base class for Set, FrozenSet, Tuple and List.""" + + _astroid_fields = ("elts",) + + def __init__(self, lineno=None, col_offset=None, parent=None): + """ + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.elts = [] + """The elements in the node. + + :type: list(NodeNG) + """ + + super(_BaseContainer, self).__init__(lineno, col_offset, parent) + + def postinit(self, elts): + """Do some setup after initialisation. + + :param elts: The list of elements the that node contains. + :type elts: list(NodeNG) + """ + self.elts = elts + + @classmethod + def from_constants(cls, elts=None): + """Create a node of this type from the given list of elements. + + :param elts: The list of elements that the node should contain. + :type elts: list(NodeNG) + + :returns: A new node containing the given elements. + :rtype: NodeNG + """ + node = cls() + if elts is None: + node.elts = [] + else: + node.elts = [const_factory(e) for e in elts] + return node + + def itered(self): + """An iterator over the elements this node contains. + + :returns: The contents of this node. + :rtype: iterable(NodeNG) + """ + return self.elts + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + :rtype: bool or Uninferable + """ + return bool(self.elts) + + @abc.abstractmethod + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + + def get_children(self): + yield from self.elts + + +class LookupMixIn: + """Mixin to look up a name in the right scope.""" + + @lru_cache(maxsize=None) + def lookup(self, name): + """Lookup where the given variable is assigned. + + The lookup starts from self's scope. If self is not a frame itself + and the name is found in the inner frame locals, statements will be + filtered to remove ignorable statements according to self's location. + + :param name: The name of the variable to find assignments for. + :type name: str + + :returns: The scope node and the list of assignments associated to the + given name according to the scope where it has been found (locals, + globals or builtin). + :rtype: tuple(str, list(NodeNG)) + """ + return self.scope().scope_lookup(self, name) + + def ilookup(self, name): + """Lookup the inferred values of the given variable. + + :param name: The variable name to find values for. + :type name: str + + :returns: The inferred values of the statements returned from + :meth:`lookup`. + :rtype: iterable + """ + frame, stmts = self.lookup(name) + context = contextmod.InferenceContext() + return bases._infer_stmts(stmts, context, frame) + + def _get_filtered_node_statements(self, nodes): + statements = [(node, node.statement()) for node in nodes] + # Next we check if we have ExceptHandlers that are parent + # of the underlying variable, in which case the last one survives + if len(statements) > 1 and all( + isinstance(stmt, ExceptHandler) for _, stmt in statements + ): + statements = [ + (node, stmt) for node, stmt in statements if stmt.parent_of(self) + ] + return statements + + def _filter_stmts(self, stmts, frame, offset): + """Filter the given list of statements to remove ignorable statements. + + If self is not a frame itself and the name is found in the inner + frame locals, statements will be filtered to remove ignorable + statements according to self's location. + + :param stmts: The statements to filter. + :type stmts: list(NodeNG) + + :param frame: The frame that all of the given statements belong to. + :type frame: NodeNG + + :param offset: The line offset to filter statements up to. + :type offset: int + + :returns: The filtered statements. + :rtype: list(NodeNG) + """ + # if offset == -1, my actual frame is not the inner frame but its parent + # + # class A(B): pass + # + # we need this to resolve B correctly + if offset == -1: + myframe = self.frame().parent.frame() + else: + myframe = self.frame() + # If the frame of this node is the same as the statement + # of this node, then the node is part of a class or + # a function definition and the frame of this node should be the + # the upper frame, not the frame of the definition. + # For more information why this is important, + # see Pylint issue #295. + # For example, for 'b', the statement is the same + # as the frame / scope: + # + # def test(b=1): + # ... + + if self.statement() is myframe and myframe.parent: + myframe = myframe.parent.frame() + mystmt = self.statement() + # line filtering if we are in the same frame + # + # take care node may be missing lineno information (this is the case for + # nodes inserted for living objects) + if myframe is frame and mystmt.fromlineno is not None: + assert mystmt.fromlineno is not None, mystmt + mylineno = mystmt.fromlineno + offset + else: + # disabling lineno filtering + mylineno = 0 + + _stmts = [] + _stmt_parents = [] + statements = self._get_filtered_node_statements(stmts) + + for node, stmt in statements: + # line filtering is on and we have reached our location, break + if stmt.fromlineno > mylineno > 0: + break + # Ignore decorators with the same name as the + # decorated function + # Fixes issue #375 + if mystmt is stmt and is_from_decorator(self): + continue + assert hasattr(node, "assign_type"), ( + node, + node.scope(), + node.scope().locals, + ) + assign_type = node.assign_type() + if node.has_base(self): + break + + _stmts, done = assign_type._get_filtered_stmts(self, node, _stmts, mystmt) + if done: + break + + optional_assign = assign_type.optional_assign + if optional_assign and assign_type.parent_of(self): + # we are inside a loop, loop var assignment is hiding previous + # assignment + _stmts = [node] + _stmt_parents = [stmt.parent] + continue + + # XXX comment various branches below!!! + try: + pindex = _stmt_parents.index(stmt.parent) + except ValueError: + pass + else: + # we got a parent index, this means the currently visited node + # is at the same block level as a previously visited node + if _stmts[pindex].assign_type().parent_of(assign_type): + # both statements are not at the same block level + continue + # if currently visited node is following previously considered + # assignment and both are not exclusive, we can drop the + # previous one. For instance in the following code :: + # + # if a: + # x = 1 + # else: + # x = 2 + # print x + # + # we can't remove neither x = 1 nor x = 2 when looking for 'x' + # of 'print x'; while in the following :: + # + # x = 1 + # x = 2 + # print x + # + # we can remove x = 1 when we see x = 2 + # + # moreover, on loop assignment types, assignment won't + # necessarily be done if the loop has no iteration, so we don't + # want to clear previous assignments if any (hence the test on + # optional_assign) + if not (optional_assign or are_exclusive(_stmts[pindex], node)): + if ( + # In case of partial function node, if the statement is different + # from the origin function then it can be deleted otherwise it should + # remain to be able to correctly infer the call to origin function. + not node.is_function + or node.qname() != "PartialFunction" + or node.name != _stmts[pindex].name + ): + del _stmt_parents[pindex] + del _stmts[pindex] + if isinstance(node, AssignName): + if not optional_assign and stmt.parent is mystmt.parent: + _stmts = [] + _stmt_parents = [] + elif isinstance(node, DelName): + _stmts = [] + _stmt_parents = [] + continue + if not are_exclusive(self, node): + _stmts.append(node) + _stmt_parents.append(stmt.parent) + return _stmts + + +# Name classes + + +class AssignName( + mixins.NoChildrenMixin, LookupMixIn, mixins.ParentAssignTypeMixin, NodeNG +): + """Variation of :class:`ast.Assign` representing assignment to a name. + + An :class:`AssignName` is the name of something that is assigned to. + This includes variables defined in a function signature or in a loop. + + >>> node = astroid.extract_node('variable = range(10)') + >>> node + + >>> list(node.get_children()) + [, ] + >>> list(node.get_children())[0].as_string() + 'variable' + """ + + _other_fields = ("name",) + + def __init__(self, name=None, lineno=None, col_offset=None, parent=None): + """ + :param name: The name that is assigned to. + :type name: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.name = name + """The name that is assigned to. + + :type: str or None + """ + + super(AssignName, self).__init__(lineno, col_offset, parent) + + +class DelName( + mixins.NoChildrenMixin, LookupMixIn, mixins.ParentAssignTypeMixin, NodeNG +): + """Variation of :class:`ast.Delete` representing deletion of a name. + + A :class:`DelName` is the name of something that is deleted. + + >>> node = astroid.extract_node("del variable #@") + >>> list(node.get_children()) + [] + >>> list(node.get_children())[0].as_string() + 'variable' + """ + + _other_fields = ("name",) + + def __init__(self, name=None, lineno=None, col_offset=None, parent=None): + """ + :param name: The name that is being deleted. + :type name: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.name = name + """The name that is being deleted. + + :type: str or None + """ + + super(DelName, self).__init__(lineno, col_offset, parent) + + +class Name(mixins.NoChildrenMixin, LookupMixIn, NodeNG): + """Class representing an :class:`ast.Name` node. + + A :class:`Name` node is something that is named, but not covered by + :class:`AssignName` or :class:`DelName`. + + >>> node = astroid.extract_node('range(10)') + >>> node + + >>> list(node.get_children()) + [, ] + >>> list(node.get_children())[0].as_string() + 'range' + """ + + _other_fields = ("name",) + + def __init__(self, name=None, lineno=None, col_offset=None, parent=None): + """ + :param name: The name that this node refers to. + :type name: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.name = name + """The name that this node refers to. + + :type: str or None + """ + + super(Name, self).__init__(lineno, col_offset, parent) + + def _get_name_nodes(self): + yield self + + for child_node in self.get_children(): + yield from child_node._get_name_nodes() + + +class Arguments(mixins.AssignTypeMixin, NodeNG): + """Class representing an :class:`ast.arguments` node. + + An :class:`Arguments` node represents that arguments in a + function definition. + + >>> node = astroid.extract_node('def foo(bar): pass') + >>> node + + >>> node.args + + """ + + # Python 3.4+ uses a different approach regarding annotations, + # each argument is a new class, _ast.arg, which exposes an + # 'annotation' attribute. In astroid though, arguments are exposed + # as is in the Arguments node and the only way to expose annotations + # is by using something similar with Python 3.3: + # - we expose 'varargannotation' and 'kwargannotation' of annotations + # of varargs and kwargs. + # - we expose 'annotation', a list with annotations for + # for each normal argument. If an argument doesn't have an + # annotation, its value will be None. + + _astroid_fields = ( + "args", + "defaults", + "kwonlyargs", + "kw_defaults", + "annotations", + "varargannotation", + "kwargannotation", + "kwonlyargs_annotations", + ) + varargannotation = None + """The type annotation for the variable length arguments. + + :type: NodeNG + """ + kwargannotation = None + """The type annotation for the variable length keyword arguments. + + :type: NodeNG + """ + + _other_fields = ("vararg", "kwarg") + + def __init__(self, vararg=None, kwarg=None, parent=None): + """ + :param vararg: The name of the variable length arguments. + :type vararg: str or None + + :param kwarg: The name of the variable length keyword arguments. + :type kwarg: str or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + super(Arguments, self).__init__(parent=parent) + self.vararg = vararg + """The name of the variable length arguments. + + :type: str or None + """ + + self.kwarg = kwarg + """The name of the variable length keyword arguments. + + :type: str or None + """ + + self.args = [] + """The names of the required arguments. + + :type: list(AssignName) + """ + + self.defaults = [] + """The default values for arguments that can be passed positionally. + + :type: list(NodeNG) + """ + + self.kwonlyargs = [] + """The keyword arguments that cannot be passed positionally. + + :type: list(AssignName) + """ + + self.kw_defaults = [] + """The default values for keyword arguments that cannot be passed positionally. + + :type: list(NodeNG) + """ + + self.annotations = [] + """The type annotations of arguments that can be passed positionally. + + :type: list(NodeNG) + """ + + self.kwonlyargs_annotations = [] + """The type annotations of arguments that cannot be passed positionally. + + :type: list(NodeNG) + """ + + def postinit( + self, + args, + defaults, + kwonlyargs, + kw_defaults, + annotations, + kwonlyargs_annotations=None, + varargannotation=None, + kwargannotation=None, + ): + """Do some setup after initialisation. + + :param args: The names of the required arguments. + :type args: list(AssignName) + + :param defaults: The default values for arguments that can be passed + positionally. + :type defaults: list(NodeNG) + + :param kwonlyargs: The keyword arguments that cannot be passed + positionally. + :type kwonlyargs: list(AssignName) + + :param kw_defaults: The default values for keyword arguments that + cannot be passed positionally. + :type kw_defaults: list(NodeNG) + + :param annotations: The type annotations of arguments that can be + passed positionally. + :type annotations: list(NodeNG) + + :param kwonlyargs_annotations: The type annotations of arguments that + cannot be passed positionally. This should always be passed in + Python 3. + :type kwonlyargs_annotations: list(NodeNG) + + :param varargannotation: The type annotation for the variable length + arguments. + :type varargannotation: NodeNG + + :param kwargannotation: The type annotation for the variable length + keyword arguments. + :type kwargannotation: NodeNG + """ + self.args = args + self.defaults = defaults + self.kwonlyargs = kwonlyargs + self.kw_defaults = kw_defaults + self.annotations = annotations + self.kwonlyargs_annotations = kwonlyargs_annotations + self.varargannotation = varargannotation + self.kwargannotation = kwargannotation + + def _infer_name(self, frame, name): + if self.parent is frame: + return name + return None + + @decorators.cachedproperty + def fromlineno(self): + """The first line that this node appears on in the source code. + + :type: int or None + """ + lineno = super(Arguments, self).fromlineno + return max(lineno, self.parent.fromlineno or 0) + + def format_args(self): + """Get the arguments formatted as string. + + :returns: The formatted arguments. + :rtype: str + """ + result = [] + if self.args: + result.append( + _format_args( + self.args, self.defaults, getattr(self, "annotations", None) + ) + ) + if self.vararg: + result.append("*%s" % self.vararg) + if self.kwonlyargs: + if not self.vararg: + result.append("*") + result.append( + _format_args( + self.kwonlyargs, self.kw_defaults, self.kwonlyargs_annotations + ) + ) + if self.kwarg: + result.append("**%s" % self.kwarg) + return ", ".join(result) + + def default_value(self, argname): + """Get the default value for an argument. + + :param argname: The name of the argument to get the default value for. + :type argname: str + + :raises NoDefault: If there is no default value defined for the + given argument. + """ + i = _find_arg(argname, self.args)[0] + if i is not None: + idx = i - (len(self.args) - len(self.defaults)) + if idx >= 0: + return self.defaults[idx] + i = _find_arg(argname, self.kwonlyargs)[0] + if i is not None and self.kw_defaults[i] is not None: + return self.kw_defaults[i] + raise exceptions.NoDefault(func=self.parent, name=argname) + + def is_argument(self, name): + """Check if the given name is defined in the arguments. + + :param name: The name to check for. + :type name: str + + :returns: True if the given name is defined in the arguments, + False otherwise. + :rtype: bool + """ + if name == self.vararg: + return True + if name == self.kwarg: + return True + return ( + self.find_argname(name, True)[1] is not None + or self.kwonlyargs + and _find_arg(name, self.kwonlyargs, True)[1] is not None + ) + + def find_argname(self, argname, rec=False): + """Get the index and :class:`AssignName` node for given name. + + :param argname: The name of the argument to search for. + :type argname: str + + :param rec: Whether or not to include arguments in unpacked tuples + in the search. + :type rec: bool + + :returns: The index and node for the argument. + :rtype: tuple(str or None, AssignName or None) + """ + if self.args: # self.args may be None in some cases (builtin function) + return _find_arg(argname, self.args, rec) + return None, None + + def get_children(self): + yield from self.args or () + + yield from self.defaults + yield from self.kwonlyargs + + for elt in self.kw_defaults: + if elt is not None: + yield elt + + for elt in self.annotations: + if elt is not None: + yield elt + + if self.varargannotation is not None: + yield self.varargannotation + + if self.kwargannotation is not None: + yield self.kwargannotation + + for elt in self.kwonlyargs_annotations: + if elt is not None: + yield elt + + +def _find_arg(argname, args, rec=False): + for i, arg in enumerate(args): + if isinstance(arg, Tuple): + if rec: + found = _find_arg(argname, arg.elts) + if found[0] is not None: + return found + elif arg.name == argname: + return i, arg + return None, None + + +def _format_args(args, defaults=None, annotations=None): + values = [] + if args is None: + return "" + if annotations is None: + annotations = [] + if defaults is not None: + default_offset = len(args) - len(defaults) + packed = itertools.zip_longest(args, annotations) + for i, (arg, annotation) in enumerate(packed): + if isinstance(arg, Tuple): + values.append("(%s)" % _format_args(arg.elts)) + else: + argname = arg.name + if annotation is not None: + argname += ":" + annotation.as_string() + values.append(argname) + + if defaults is not None and i >= default_offset: + if defaults[i - default_offset] is not None: + values[-1] += "=" + defaults[i - default_offset].as_string() + return ", ".join(values) + + +class AssignAttr(mixins.ParentAssignTypeMixin, NodeNG): + """Variation of :class:`ast.Assign` representing assignment to an attribute. + + >>> node = astroid.extract_node('self.attribute = range(10)') + >>> node + + >>> list(node.get_children()) + [, ] + >>> list(node.get_children())[0].as_string() + 'self.attribute' + """ + + _astroid_fields = ("expr",) + _other_fields = ("attrname",) + expr = None + """What has the attribute that is being assigned to. + + :type: NodeNG or None + """ + + def __init__(self, attrname=None, lineno=None, col_offset=None, parent=None): + """ + :param attrname: The name of the attribute being assigned to. + :type attrname: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.attrname = attrname + """The name of the attribute being assigned to. + + :type: str or None + """ + + super(AssignAttr, self).__init__(lineno, col_offset, parent) + + def postinit(self, expr=None): + """Do some setup after initialisation. + + :param expr: What has the attribute that is being assigned to. + :type expr: NodeNG or None + """ + self.expr = expr + + def get_children(self): + yield self.expr + + +class Assert(Statement): + """Class representing an :class:`ast.Assert` node. + + An :class:`Assert` node represents an assert statement. + + >>> node = astroid.extract_node('assert len(things) == 10, "Not enough things"') + >>> node + + """ + + _astroid_fields = ("test", "fail") + test = None + """The test that passes or fails the assertion. + + :type: NodeNG or None + """ + fail = None + """The message shown when the assertion fails. + + :type: NodeNG or None + """ + + def postinit(self, test=None, fail=None): + """Do some setup after initialisation. + + :param test: The test that passes or fails the assertion. + :type test: NodeNG or None + + :param fail: The message shown when the assertion fails. + :type fail: NodeNG or None + """ + self.fail = fail + self.test = test + + def get_children(self): + yield self.test + + if self.fail is not None: + yield self.fail + + +class Assign(mixins.AssignTypeMixin, Statement): + """Class representing an :class:`ast.Assign` node. + + An :class:`Assign` is a statement where something is explicitly + asssigned to. + + >>> node = astroid.extract_node('variable = range(10)') + >>> node + + """ + + _astroid_fields = ("targets", "value") + _other_other_fields = ("type_annotation",) + targets = None + """What is being assigned to. + + :type: list(NodeNG) or None + """ + value = None + """The value being assigned to the variables. + + :type: NodeNG or None + """ + type_annotation = None + """If present, this will contain the type annotation passed by a type comment + + :type: NodeNG or None + """ + + def postinit(self, targets=None, value=None, type_annotation=None): + """Do some setup after initialisation. + + :param targets: What is being assigned to. + :type targets: list(NodeNG) or None + + :param value: The value being assigned to the variables. + :type: NodeNG or None + """ + self.targets = targets + self.value = value + self.type_annotation = type_annotation + + def get_children(self): + yield from self.targets + + yield self.value + + @decorators.cached + def _get_assign_nodes(self): + return [self] + list(self.value._get_assign_nodes()) + + def _get_yield_nodes_skip_lambdas(self): + yield from self.value._get_yield_nodes_skip_lambdas() + + +class AnnAssign(mixins.AssignTypeMixin, Statement): + """Class representing an :class:`ast.AnnAssign` node. + + An :class:`AnnAssign` is an assignment with a type annotation. + + >>> node = astroid.extract_node('variable: List[int] = range(10)') + >>> node + + """ + + _astroid_fields = ("target", "annotation", "value") + _other_fields = ("simple",) + target = None + """What is being assigned to. + + :type: NodeNG or None + """ + annotation = None + """The type annotation of what is being assigned to. + + :type: NodeNG + """ + value = None + """The value being assigned to the variables. + + :type: NodeNG or None + """ + simple = None + """Whether :attr:`target` is a pure name or a complex statement. + + :type: int + """ + + def postinit(self, target, annotation, simple, value=None): + """Do some setup after initialisation. + + :param target: What is being assigned to. + :type target: NodeNG + + :param annotation: The type annotation of what is being assigned to. + :type: NodeNG + + :param simple: Whether :attr:`target` is a pure name + or a complex statement. + :type simple: int + + :param value: The value being assigned to the variables. + :type: NodeNG or None + """ + self.target = target + self.annotation = annotation + self.value = value + self.simple = simple + + def get_children(self): + yield self.target + yield self.annotation + + if self.value is not None: + yield self.value + + +class AugAssign(mixins.AssignTypeMixin, Statement): + """Class representing an :class:`ast.AugAssign` node. + + An :class:`AugAssign` is an assignment paired with an operator. + + >>> node = astroid.extract_node('variable += 1') + >>> node + + """ + + _astroid_fields = ("target", "value") + _other_fields = ("op",) + target = None + """What is being assigned to. + + :type: NodeNG or None + """ + value = None + """The value being assigned to the variable. + + :type: NodeNG or None + """ + + def __init__(self, op=None, lineno=None, col_offset=None, parent=None): + """ + :param op: The operator that is being combined with the assignment. + This includes the equals sign. + :type op: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.op = op + """The operator that is being combined with the assignment. + + This includes the equals sign. + + :type: str or None + """ + + super(AugAssign, self).__init__(lineno, col_offset, parent) + + def postinit(self, target=None, value=None): + """Do some setup after initialisation. + + :param target: What is being assigned to. + :type target: NodeNG or None + + :param value: The value being assigned to the variable. + :type: NodeNG or None + """ + self.target = target + self.value = value + + # This is set by inference.py + def _infer_augassign(self, context=None): + raise NotImplementedError + + def type_errors(self, context=None): + """Get a list of type errors which can occur during inference. + + Each TypeError is represented by a :class:`BadBinaryOperationMessage` , + which holds the original exception. + + :returns: The list of possible type errors. + :rtype: list(BadBinaryOperationMessage) + """ + try: + results = self._infer_augassign(context=context) + return [ + result + for result in results + if isinstance(result, util.BadBinaryOperationMessage) + ] + except exceptions.InferenceError: + return [] + + def get_children(self): + yield self.target + yield self.value + + +class Repr(NodeNG): + """Class representing an :class:`ast.Repr` node. + + A :class:`Repr` node represents the backtick syntax, + which is a deprecated alias for :func:`repr` removed in Python 3. + + >>> node = astroid.extract_node('`variable`') + >>> node + + """ + + _astroid_fields = ("value",) + value = None + """What is having :func:`repr` called on it. + + :type: NodeNG or None + """ + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: What is having :func:`repr` called on it. + :type value: NodeNG or None + """ + self.value = value + + +class BinOp(NodeNG): + """Class representing an :class:`ast.BinOp` node. + + A :class:`BinOp` node is an application of a binary operator. + + >>> node = astroid.extract_node('a + b') + >>> node + + """ + + _astroid_fields = ("left", "right") + _other_fields = ("op",) + left = None + """What is being applied to the operator on the left side. + + :type: NodeNG or None + """ + right = None + """What is being applied to the operator on the right side. + + :type: NodeNG or None + """ + + def __init__(self, op=None, lineno=None, col_offset=None, parent=None): + """ + :param op: The operator. + :type: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.op = op + """The operator. + + :type: str or None + """ + + super(BinOp, self).__init__(lineno, col_offset, parent) + + def postinit(self, left=None, right=None): + """Do some setup after initialisation. + + :param left: What is being applied to the operator on the left side. + :type left: NodeNG or None + + :param right: What is being applied to the operator on the right side. + :type right: NodeNG or None + """ + self.left = left + self.right = right + + # This is set by inference.py + def _infer_binop(self, context=None): + raise NotImplementedError + + def type_errors(self, context=None): + """Get a list of type errors which can occur during inference. + + Each TypeError is represented by a :class:`BadBinaryOperationMessage`, + which holds the original exception. + + :returns: The list of possible type errors. + :rtype: list(BadBinaryOperationMessage) + """ + try: + results = self._infer_binop(context=context) + return [ + result + for result in results + if isinstance(result, util.BadBinaryOperationMessage) + ] + except exceptions.InferenceError: + return [] + + def get_children(self): + yield self.left + yield self.right + + def op_precedence(self): + return OP_PRECEDENCE[self.op] + + def op_left_associative(self): + # 2**3**4 == 2**(3**4) + return self.op != "**" + + +class BoolOp(NodeNG): + """Class representing an :class:`ast.BoolOp` node. + + A :class:`BoolOp` is an application of a boolean operator. + + >>> node = astroid.extract_node('a and b') + >>> node + + """ + + _astroid_fields = ("values",) + _other_fields = ("op",) + values = None + """The values being applied to the operator. + + :type: list(NodeNG) or None + """ + + def __init__(self, op=None, lineno=None, col_offset=None, parent=None): + """ + :param op: The operator. + :type: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.op = op + """The operator. + + :type: str or None + """ + + super(BoolOp, self).__init__(lineno, col_offset, parent) + + def postinit(self, values=None): + """Do some setup after initialisation. + + :param values: The values being applied to the operator. + :type values: list(NodeNG) or None + """ + self.values = values + + def get_children(self): + yield from self.values + + def op_precedence(self): + return OP_PRECEDENCE[self.op] + + +class Break(mixins.NoChildrenMixin, Statement): + """Class representing an :class:`ast.Break` node. + + >>> node = astroid.extract_node('break') + >>> node + + """ + + +class Call(NodeNG): + """Class representing an :class:`ast.Call` node. + + A :class:`Call` node is a call to a function, method, etc. + + >>> node = astroid.extract_node('function()') + >>> node + + """ + + _astroid_fields = ("func", "args", "keywords") + func = None + """What is being called. + + :type: NodeNG or None + """ + args = None + """The positional arguments being given to the call. + + :type: list(NodeNG) or None + """ + keywords = None + """The keyword arguments being given to the call. + + :type: list(NodeNG) or None + """ + + def postinit(self, func=None, args=None, keywords=None): + """Do some setup after initialisation. + + :param func: What is being called. + :type func: NodeNG or None + + :param args: The positional arguments being given to the call. + :type args: list(NodeNG) or None + + :param keywords: The keyword arguments being given to the call. + :type keywords: list(NodeNG) or None + """ + self.func = func + self.args = args + self.keywords = keywords + + @property + def starargs(self): + """The positional arguments that unpack something. + + :type: list(Starred) + """ + args = self.args or [] + return [arg for arg in args if isinstance(arg, Starred)] + + @property + def kwargs(self): + """The keyword arguments that unpack something. + + :type: list(Keyword) + """ + keywords = self.keywords or [] + return [keyword for keyword in keywords if keyword.arg is None] + + def get_children(self): + yield self.func + + yield from self.args + + yield from self.keywords or () + + +class Compare(NodeNG): + """Class representing an :class:`ast.Compare` node. + + A :class:`Compare` node indicates a comparison. + + >>> node = astroid.extract_node('a <= b <= c') + >>> node + + >>> node.ops + [('<=', ), ('<=', )] + """ + + _astroid_fields = ("left", "ops") + left = None + """The value at the left being applied to a comparison operator. + + :type: NodeNG or None + """ + ops = None + """The remainder of the operators and their relevant right hand value. + + :type: list(tuple(str, NodeNG)) or None + """ + + def postinit(self, left=None, ops=None): + """Do some setup after initialisation. + + :param left: The value at the left being applied to a comparison + operator. + :type left: NodeNG or None + + :param ops: The remainder of the operators + and their relevant right hand value. + :type ops: list(tuple(str, NodeNG)) or None + """ + self.left = left + self.ops = ops + + def get_children(self): + """Get the child nodes below this node. + + Overridden to handle the tuple fields and skip returning the operator + strings. + + :returns: The children. + :rtype: iterable(NodeNG) + """ + yield self.left + for _, comparator in self.ops: + yield comparator # we don't want the 'op' + + def last_child(self): + """An optimized version of list(get_children())[-1] + + :returns: The last child. + :rtype: NodeNG + """ + # XXX maybe if self.ops: + return self.ops[-1][1] + # return self.left + + +class Comprehension(NodeNG): + """Class representing an :class:`ast.comprehension` node. + + A :class:`Comprehension` indicates the loop inside any type of + comprehension including generator expressions. + + >>> node = astroid.extract_node('[x for x in some_values]') + >>> list(node.get_children()) + [, ] + >>> list(node.get_children())[1].as_string() + 'for x in some_values' + """ + + _astroid_fields = ("target", "iter", "ifs") + _other_fields = ("is_async",) + target = None + """What is assigned to by the comprehension. + + :type: NodeNG or None + """ + iter = None + """What is iterated over by the comprehension. + + :type: NodeNG or None + """ + ifs = None + """The contents of any if statements that filter the comprehension. + + :type: list(NodeNG) or None + """ + is_async = None + """Whether this is an asynchronous comprehension or not. + + :type: bool or None + """ + + def __init__(self, parent=None): + """ + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + super(Comprehension, self).__init__() + self.parent = parent + + # pylint: disable=redefined-builtin; same name as builtin ast module. + def postinit(self, target=None, iter=None, ifs=None, is_async=None): + """Do some setup after initialisation. + + :param target: What is assigned to by the comprehension. + :type target: NodeNG or None + + :param iter: What is iterated over by the comprehension. + :type iter: NodeNG or None + + :param ifs: The contents of any if statements that filter + the comprehension. + :type ifs: list(NodeNG) or None + + :param is_async: Whether this is an asynchronous comprehension or not. + :type: bool or None + """ + self.target = target + self.iter = iter + self.ifs = ifs + self.is_async = is_async + + optional_assign = True + """Whether this node optionally assigns a variable. + + :type: bool + """ + + def assign_type(self): + """The type of assignment that this node performs. + + :returns: The assignment type. + :rtype: NodeNG + """ + return self + + def _get_filtered_stmts(self, lookup_node, node, stmts, mystmt): + """method used in filter_stmts""" + if self is mystmt: + if isinstance(lookup_node, (Const, Name)): + return [lookup_node], True + + elif self.statement() is mystmt: + # original node's statement is the assignment, only keeps + # current node (gen exp, list comp) + + return [node], True + + return stmts, False + + def get_children(self): + yield self.target + yield self.iter + + yield from self.ifs + + +class Const(mixins.NoChildrenMixin, NodeNG, bases.Instance): + """Class representing any constant including num, str, bool, None, bytes. + + >>> node = astroid.extract_node('(5, "This is a string.", True, None, b"bytes")') + >>> node + + >>> list(node.get_children()) + [, + , + , + , + ] + """ + + _other_fields = ("value",) + + def __init__(self, value, lineno=None, col_offset=None, parent=None): + """ + :param value: The value that the constant represents. + :type value: object + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.value = value + """The value that the constant represents. + + :type: object + """ + + super(Const, self).__init__(lineno, col_offset, parent) + + def __getattr__(self, name): + # This is needed because of Proxy's __getattr__ method. + # Calling object.__new__ on this class without calling + # __init__ would result in an infinite loop otherwise + # since __getattr__ is called when an attribute doesn't + # exist and self._proxied indirectly calls self.value + # and Proxy __getattr__ calls self.value + if name == "value": + raise AttributeError + return super().__getattr__(name) + + def getitem(self, index, context=None): + """Get an item from this node if subscriptable. + + :param index: The node to use as a subscript index. + :type index: Const or Slice + + :raises AstroidTypeError: When the given index cannot be used as a + subscript index, or if this node is not subscriptable. + """ + if isinstance(index, Const): + index_value = index.value + elif isinstance(index, Slice): + index_value = _infer_slice(index, context=context) + + else: + raise exceptions.AstroidTypeError( + "Could not use type {} as subscript index".format(type(index)) + ) + + try: + if isinstance(self.value, (str, bytes)): + return Const(self.value[index_value]) + except IndexError as exc: + raise exceptions.AstroidIndexError( + message="Index {index!r} out of range", + node=self, + index=index, + context=context, + ) from exc + except TypeError as exc: + raise exceptions.AstroidTypeError( + message="Type error {error!r}", node=self, index=index, context=context + ) from exc + + raise exceptions.AstroidTypeError("%r (value=%s)" % (self, self.value)) + + def has_dynamic_getattr(self): + """Check if the node has a custom __getattr__ or __getattribute__. + + :returns: True if the class has a custom + __getattr__ or __getattribute__, False otherwise. + For a :class:`Const` this is always ``False``. + :rtype: bool + """ + return False + + def itered(self): + """An iterator over the elements this node contains. + + :returns: The contents of this node. + :rtype: iterable(str) + + :raises TypeError: If this node does not represent something that is iterable. + """ + if isinstance(self.value, str): + return self.value + raise TypeError() + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + return self._proxied.qname() + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + :rtype: bool + """ + return bool(self.value) + + +class Continue(mixins.NoChildrenMixin, Statement): + """Class representing an :class:`ast.Continue` node. + + >>> node = astroid.extract_node('continue') + >>> node + + """ + + +class Decorators(NodeNG): + """A node representing a list of decorators. + + A :class:`Decorators` is the decorators that are applied to + a method or function. + + >>> node = astroid.extract_node(''' + @property + def my_property(self): + return 3 + ''') + >>> node + + >>> list(node.get_children())[0] + + """ + + _astroid_fields = ("nodes",) + nodes = None + """The decorators that this node contains. + + :type: list(Name or Call) or None + """ + + def postinit(self, nodes): + """Do some setup after initialisation. + + :param nodes: The decorators that this node contains. + :type nodes: list(Name or Call) + """ + self.nodes = nodes + + def scope(self): + """The first parent node defining a new scope. + + :returns: The first parent scope node. + :rtype: Module or FunctionDef or ClassDef or Lambda or GenExpr + """ + # skip the function node to go directly to the upper level scope + return self.parent.parent.scope() + + def get_children(self): + yield from self.nodes + + +class DelAttr(mixins.ParentAssignTypeMixin, NodeNG): + """Variation of :class:`ast.Delete` representing deletion of an attribute. + + >>> node = astroid.extract_node('del self.attr') + >>> node + + >>> list(node.get_children())[0] + + """ + + _astroid_fields = ("expr",) + _other_fields = ("attrname",) + expr = None + """The name that this node represents. + + :type: Name or None + """ + + def __init__(self, attrname=None, lineno=None, col_offset=None, parent=None): + """ + :param attrname: The name of the attribute that is being deleted. + :type attrname: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.attrname = attrname + """The name of the attribute that is being deleted. + + :type: str or None + """ + + super(DelAttr, self).__init__(lineno, col_offset, parent) + + def postinit(self, expr=None): + """Do some setup after initialisation. + + :param expr: The name that this node represents. + :type expr: Name or None + """ + self.expr = expr + + def get_children(self): + yield self.expr + + +class Delete(mixins.AssignTypeMixin, Statement): + """Class representing an :class:`ast.Delete` node. + + A :class:`Delete` is a ``del`` statement this is deleting something. + + >>> node = astroid.extract_node('del self.attr') + >>> node + + """ + + _astroid_fields = ("targets",) + targets = None + """What is being deleted. + + :type: list(NodeNG) or None + """ + + def postinit(self, targets=None): + """Do some setup after initialisation. + + :param targets: What is being deleted. + :type targets: list(NodeNG) or None + """ + self.targets = targets + + def get_children(self): + yield from self.targets + + +class Dict(NodeNG, bases.Instance): + """Class representing an :class:`ast.Dict` node. + + A :class:`Dict` is a dictionary that is created with ``{}`` syntax. + + >>> node = astroid.extract_node('{1: "1"}') + >>> node + + """ + + _astroid_fields = ("items",) + + def __init__(self, lineno=None, col_offset=None, parent=None): + """ + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.items = [] + """The key-value pairs contained in the dictionary. + + :type: list(tuple(NodeNG, NodeNG)) + """ + + super(Dict, self).__init__(lineno, col_offset, parent) + + def postinit(self, items): + """Do some setup after initialisation. + + :param items: The key-value pairs contained in the dictionary. + :type items: list(tuple(NodeNG, NodeNG)) + """ + self.items = items + + @classmethod + def from_constants(cls, items=None): + """Create a :class:`Dict` of constants from a live dictionary. + + :param items: The items to store in the node. + :type items: dict + + :returns: The created dictionary node. + :rtype: Dict + """ + node = cls() + if items is None: + node.items = [] + else: + node.items = [ + (const_factory(k), const_factory(v)) for k, v in items.items() + ] + return node + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + return "%s.dict" % BUILTINS + + def get_children(self): + """Get the key and value nodes below this node. + + Children are returned in the order that they are defined in the source + code, key first then the value. + + :returns: The children. + :rtype: iterable(NodeNG) + """ + for key, value in self.items: + yield key + yield value + + def last_child(self): + """An optimized version of list(get_children())[-1] + + :returns: The last child, or None if no children exist. + :rtype: NodeNG or None + """ + if self.items: + return self.items[-1][1] + return None + + def itered(self): + """An iterator over the keys this node contains. + + :returns: The keys of this node. + :rtype: iterable(NodeNG) + """ + return [key for (key, _) in self.items] + + def getitem(self, index, context=None): + """Get an item from this node. + + :param index: The node to use as a subscript index. + :type index: Const or Slice + + :raises AstroidTypeError: When the given index cannot be used as a + subscript index, or if this node is not subscriptable. + :raises AstroidIndexError: If the given index does not exist in the + dictionary. + """ + for key, value in self.items: + # TODO(cpopa): no support for overriding yet, {1:2, **{1: 3}}. + if isinstance(key, DictUnpack): + try: + return value.getitem(index, context) + except (exceptions.AstroidTypeError, exceptions.AstroidIndexError): + continue + for inferredkey in key.infer(context): + if inferredkey is util.Uninferable: + continue + if isinstance(inferredkey, Const) and isinstance(index, Const): + if inferredkey.value == index.value: + return value + + raise exceptions.AstroidIndexError(index) + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + :rtype: bool + """ + return bool(self.items) + + +class Expr(Statement): + """Class representing an :class:`ast.Expr` node. + + An :class:`Expr` is any expression that does not have its value used or + stored. + + >>> node = astroid.extract_node('method()') + >>> node + + >>> node.parent + + """ + + _astroid_fields = ("value",) + value = None + """What the expression does. + + :type: NodeNG or None + """ + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: What the expression does. + :type value: NodeNG or None + """ + self.value = value + + def get_children(self): + yield self.value + + def _get_yield_nodes_skip_lambdas(self): + if not self.value.is_lambda: + yield from self.value._get_yield_nodes_skip_lambdas() + + +class Ellipsis(mixins.NoChildrenMixin, NodeNG): # pylint: disable=redefined-builtin + """Class representing an :class:`ast.Ellipsis` node. + + An :class:`Ellipsis` is the ``...`` syntax. + + >>> node = astroid.extract_node('...') + >>> node + + """ + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For an :class:`Ellipsis` this is always ``True``. + :rtype: bool + """ + return True + + +class EmptyNode(mixins.NoChildrenMixin, NodeNG): + """Holds an arbitrary object in the :attr:`LocalsDictNodeNG.locals`.""" + + object = None + + +class ExceptHandler(mixins.MultiLineBlockMixin, mixins.AssignTypeMixin, Statement): + """Class representing an :class:`ast.ExceptHandler`. node. + + An :class:`ExceptHandler` is an ``except`` block on a try-except. + + >>> node = astroid.extract_node(''' + try: + do_something() + except Exception as error: + print("Error!") + ''') + >>> node + + >>> >>> node.handlers + [] + """ + + _astroid_fields = ("type", "name", "body") + _multi_line_block_fields = ("body",) + type = None + """The types that the block handles. + + :type: Tuple or NodeNG or None + """ + name = None + """The name that the caught exception is assigned to. + + :type: AssignName or None + """ + body = None + """The contents of the block. + + :type: list(NodeNG) or None + """ + + def get_children(self): + if self.type is not None: + yield self.type + + if self.name is not None: + yield self.name + + yield from self.body + + # pylint: disable=redefined-builtin; had to use the same name as builtin ast module. + def postinit(self, type=None, name=None, body=None): + """Do some setup after initialisation. + + :param type: The types that the block handles. + :type type: Tuple or NodeNG or None + + :param name: The name that the caught exception is assigned to. + :type name: AssignName or None + + :param body:The contents of the block. + :type body: list(NodeNG) or None + """ + self.type = type + self.name = name + self.body = body + + @decorators.cachedproperty + def blockstart_tolineno(self): + """The line on which the beginning of this block ends. + + :type: int + """ + if self.name: + return self.name.tolineno + if self.type: + return self.type.tolineno + return self.lineno + + def catch(self, exceptions): # pylint: disable=redefined-outer-name + """Check if this node handles any of the given exceptions. + + If ``exceptions`` is empty, this will default to ``True``. + + :param exceptions: The name of the exceptions to check for. + :type exceptions: list(str) + """ + if self.type is None or exceptions is None: + return True + for node in self.type._get_name_nodes(): + if node.name in exceptions: + return True + return False + + +class Exec(Statement): + """Class representing the ``exec`` statement. + + >>> node = astroid.extract_node('exec "True"') + >>> node + + """ + + _astroid_fields = ("expr", "globals", "locals") + expr = None + """The expression to be executed. + + :type: NodeNG or None + """ + globals = None + """The globals dictionary to execute with. + + :type: NodeNG or None + """ + locals = None + """The locals dictionary to execute with. + + :type: NodeNG or None + """ + + # pylint: disable=redefined-builtin; had to use the same name as builtin ast module. + def postinit(self, expr=None, globals=None, locals=None): + """Do some setup after initialisation. + + :param expr: The expression to be executed. + :type expr: NodeNG or None + + :param globals:The globals dictionary to execute with. + :type globals: NodeNG or None + + :param locals: The locals dictionary to execute with. + :type locals: NodeNG or None + """ + self.expr = expr + self.globals = globals + self.locals = locals + + +class ExtSlice(NodeNG): + """Class representing an :class:`ast.ExtSlice` node. + + An :class:`ExtSlice` is a complex slice expression. + + >>> node = astroid.extract_node('l[1:3, 5]') + >>> node + + >>> node.slice + + """ + + _astroid_fields = ("dims",) + dims = None + """The simple dimensions that form the complete slice. + + :type: list(NodeNG) or None + """ + + def postinit(self, dims=None): + """Do some setup after initialisation. + + :param dims: The simple dimensions that form the complete slice. + :type dims: list(NodeNG) or None + """ + self.dims = dims + + +class For( + mixins.MultiLineBlockMixin, + mixins.BlockRangeMixIn, + mixins.AssignTypeMixin, + Statement, +): + """Class representing an :class:`ast.For` node. + + >>> node = astroid.extract_node('for thing in things: print(thing)') + >>> node + + """ + + _astroid_fields = ("target", "iter", "body", "orelse") + _other_other_fields = ("type_annotation",) + _multi_line_block_fields = ("body", "orelse") + target = None + """What the loop assigns to. + + :type: NodeNG or None + """ + iter = None + """What the loop iterates over. + + :type: NodeNG or None + """ + body = None + """The contents of the body of the loop. + + :type: list(NodeNG) or None + """ + orelse = None + """The contents of the ``else`` block of the loop. + + :type: list(NodeNG) or None + """ + type_annotation = None + """If present, this will contain the type annotation passed by a type comment + + :type: NodeNG or None + """ + + # pylint: disable=redefined-builtin; had to use the same name as builtin ast module. + def postinit( + self, target=None, iter=None, body=None, orelse=None, type_annotation=None + ): + """Do some setup after initialisation. + + :param target: What the loop assigns to. + :type target: NodeNG or None + + :param iter: What the loop iterates over. + :type iter: NodeNG or None + + :param body: The contents of the body of the loop. + :type body: list(NodeNG) or None + + :param orelse: The contents of the ``else`` block of the loop. + :type orelse: list(NodeNG) or None + """ + self.target = target + self.iter = iter + self.body = body + self.orelse = orelse + self.type_annotation = type_annotation + + optional_assign = True + """Whether this node optionally assigns a variable. + + This is always ``True`` for :class:`For` nodes. + + :type: bool + """ + + @decorators.cachedproperty + def blockstart_tolineno(self): + """The line on which the beginning of this block ends. + + :type: int + """ + return self.iter.tolineno + + def get_children(self): + yield self.target + yield self.iter + + yield from self.body + yield from self.orelse + + +class AsyncFor(For): + """Class representing an :class:`ast.AsyncFor` node. + + An :class:`AsyncFor` is an asynchronous :class:`For` built with + the ``async`` keyword. + + >>> node = astroid.extract_node(''' + async def func(things): + async for thing in things: + print(thing) + ''') + >>> node + + >>> node.body[0] + + """ + + +class Await(NodeNG): + """Class representing an :class:`ast.Await` node. + + An :class:`Await` is the ``await`` keyword. + + >>> node = astroid.extract_node(''' + async def func(things): + await other_func() + ''') + >>> node + + >>> node.body[0] + + >>> list(node.body[0].get_children())[0] + + """ + + _astroid_fields = ("value",) + value = None + """What to wait for. + + :type: NodeNG or None + """ + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: What to wait for. + :type value: NodeNG or None + """ + self.value = value + + def get_children(self): + yield self.value + + +class ImportFrom(mixins.NoChildrenMixin, mixins.ImportFromMixin, Statement): + """Class representing an :class:`ast.ImportFrom` node. + + >>> node = astroid.extract_node('from my_package import my_module') + >>> node + + """ + + _other_fields = ("modname", "names", "level") + + def __init__( + self, fromname, names, level=0, lineno=None, col_offset=None, parent=None + ): + """ + :param fromname: The module that is being imported from. + :type fromname: str or None + + :param names: What is being imported from the module. + :type names: list(tuple(str, str or None)) + + :param level: The level of relative import. + :type level: int + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.modname = fromname + """The module that is being imported from. + + This is ``None`` for relative imports. + + :type: str or None + """ + + self.names = names + """What is being imported from the module. + + Each entry is a :class:`tuple` of the name being imported, + and the alias that the name is assigned to (if any). + + :type: list(tuple(str, str or None)) + """ + + self.level = level + """The level of relative import. + + Essentially this is the number of dots in the import. + This is always 0 for absolute imports. + + :type: int + """ + + super(ImportFrom, self).__init__(lineno, col_offset, parent) + + +class Attribute(NodeNG): + """Class representing an :class:`ast.Attribute` node.""" + + _astroid_fields = ("expr",) + _other_fields = ("attrname",) + expr = None + """The name that this node represents. + + :type: Name or None + """ + + def __init__(self, attrname=None, lineno=None, col_offset=None, parent=None): + """ + :param attrname: The name of the attribute. + :type attrname: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.attrname = attrname + """The name of the attribute. + + :type: str or None + """ + + super(Attribute, self).__init__(lineno, col_offset, parent) + + def postinit(self, expr=None): + """Do some setup after initialisation. + + :param expr: The name that this node represents. + :type expr: Name or None + """ + self.expr = expr + + def get_children(self): + yield self.expr + + +class Global(mixins.NoChildrenMixin, Statement): + """Class representing an :class:`ast.Global` node. + + >>> node = astroid.extract_node('global a_global') + >>> node + + """ + + _other_fields = ("names",) + + def __init__(self, names, lineno=None, col_offset=None, parent=None): + """ + :param names: The names being declared as global. + :type names: list(str) + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.names = names + """The names being declared as global. + + :type: list(str) + """ + + super(Global, self).__init__(lineno, col_offset, parent) + + def _infer_name(self, frame, name): + return name + + +class If(mixins.MultiLineBlockMixin, mixins.BlockRangeMixIn, Statement): + """Class representing an :class:`ast.If` node. + + >>> node = astroid.extract_node('if condition: print(True)') + >>> node + + """ + + _astroid_fields = ("test", "body", "orelse") + _multi_line_block_fields = ("body", "orelse") + test = None + """The condition that the statement tests. + + :type: NodeNG or None + """ + body = None + """The contents of the block. + + :type: list(NodeNG) or None + """ + orelse = None + """The contents of the ``else`` block. + + :type: list(NodeNG) or None + """ + + def postinit(self, test=None, body=None, orelse=None): + """Do some setup after initialisation. + + :param test: The condition that the statement tests. + :type test: NodeNG or None + + :param body: The contents of the block. + :type body: list(NodeNG) or None + + :param orelse: The contents of the ``else`` block. + :type orelse: list(NodeNG) or None + """ + self.test = test + self.body = body + self.orelse = orelse + + @decorators.cachedproperty + def blockstart_tolineno(self): + """The line on which the beginning of this block ends. + + :type: int + """ + return self.test.tolineno + + def block_range(self, lineno): + """Get a range from the given line number to where this node ends. + + :param lineno: The line number to start the range at. + :type lineno: int + + :returns: The range of line numbers that this node belongs to, + starting at the given line number. + :rtype: tuple(int, int) + """ + if lineno == self.body[0].fromlineno: + return lineno, lineno + if lineno <= self.body[-1].tolineno: + return lineno, self.body[-1].tolineno + return self._elsed_block_range(lineno, self.orelse, self.body[0].fromlineno - 1) + + def get_children(self): + yield self.test + + yield from self.body + yield from self.orelse + + def has_elif_block(self): + return len(self.orelse) == 1 and isinstance(self.orelse[0], If) + + +class IfExp(NodeNG): + """Class representing an :class:`ast.IfExp` node. + + >>> node = astroid.extract_node('value if condition else other') + >>> node + + """ + + _astroid_fields = ("test", "body", "orelse") + test = None + """The condition that the statement tests. + + :type: NodeNG or None + """ + body = None + """The contents of the block. + + :type: list(NodeNG) or None + """ + orelse = None + """The contents of the ``else`` block. + + :type: list(NodeNG) or None + """ + + def postinit(self, test=None, body=None, orelse=None): + """Do some setup after initialisation. + + :param test: The condition that the statement tests. + :type test: NodeNG or None + + :param body: The contents of the block. + :type body: list(NodeNG) or None + + :param orelse: The contents of the ``else`` block. + :type orelse: list(NodeNG) or None + """ + self.test = test + self.body = body + self.orelse = orelse + + def get_children(self): + yield self.test + yield self.body + yield self.orelse + + def op_left_associative(self): + # `1 if True else 2 if False else 3` is parsed as + # `1 if True else (2 if False else 3)` + return False + + +class Import(mixins.NoChildrenMixin, mixins.ImportFromMixin, Statement): + """Class representing an :class:`ast.Import` node. + + >>> node = astroid.extract_node('import astroid') + >>> node + + """ + + _other_fields = ("names",) + + def __init__(self, names=None, lineno=None, col_offset=None, parent=None): + """ + :param names: The names being imported. + :type names: list(tuple(str, str or None)) or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.names = names + """The names being imported. + + Each entry is a :class:`tuple` of the name being imported, + and the alias that the name is assigned to (if any). + + :type: list(tuple(str, str or None)) or None + """ + + super(Import, self).__init__(lineno, col_offset, parent) + + +class Index(NodeNG): + """Class representing an :class:`ast.Index` node. + + An :class:`Index` is a simple subscript. + + >>> node = astroid.extract_node('things[1]') + >>> node + + >>> node.slice + + """ + + _astroid_fields = ("value",) + value = None + """The value to subscript with. + + :type: NodeNG or None + """ + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: The value to subscript with. + :type value: NodeNG or None + """ + self.value = value + + def get_children(self): + yield self.value + + +class Keyword(NodeNG): + """Class representing an :class:`ast.keyword` node. + + >>> node = astroid.extract_node('function(a_kwarg=True)') + >>> node + + >>> node.keywords + [] + """ + + _astroid_fields = ("value",) + _other_fields = ("arg",) + value = None + """The value being assigned to the keyword argument. + + :type: NodeNG or None + """ + + def __init__(self, arg=None, lineno=None, col_offset=None, parent=None): + """ + :param arg: The argument being assigned to. + :type arg: Name or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.arg = arg + """The argument being assigned to. + + :type: Name or None + """ + + super(Keyword, self).__init__(lineno, col_offset, parent) + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: The value being assigned to the ketword argument. + :type value: NodeNG or None + """ + self.value = value + + def get_children(self): + yield self.value + + +class List(_BaseContainer): + """Class representing an :class:`ast.List` node. + + >>> node = astroid.extract_node('[1, 2, 3]') + >>> node + + """ + + _other_fields = ("ctx",) + + def __init__(self, ctx=None, lineno=None, col_offset=None, parent=None): + """ + :param ctx: Whether the list is assigned to or loaded from. + :type ctx: Context or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.ctx = ctx + """Whether the list is assigned to or loaded from. + + :type: Context or None + """ + + super(List, self).__init__(lineno, col_offset, parent) + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + return "%s.list" % BUILTINS + + def getitem(self, index, context=None): + """Get an item from this node. + + :param index: The node to use as a subscript index. + :type index: Const or Slice + """ + return _container_getitem(self, self.elts, index, context=context) + + +class Nonlocal(mixins.NoChildrenMixin, Statement): + """Class representing an :class:`ast.Nonlocal` node. + + >>> node = astroid.extract_node(''' + def function(): + nonlocal var + ''') + >>> node + + >>> node.body[0] + + """ + + _other_fields = ("names",) + + def __init__(self, names, lineno=None, col_offset=None, parent=None): + """ + :param names: The names being declared as not local. + :type names: list(str) + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.names = names + """The names being declared as not local. + + :type: list(str) + """ + + super(Nonlocal, self).__init__(lineno, col_offset, parent) + + def _infer_name(self, frame, name): + return name + + +class Pass(mixins.NoChildrenMixin, Statement): + """Class representing an :class:`ast.Pass` node. + + >>> node = astroid.extract_node('pass') + >>> node + + """ + + +class Print(Statement): + """Class representing an :class:`ast.Print` node. + + >>> node = astroid.extract_node('print "A message"') + >>> node + + """ + + _astroid_fields = ("dest", "values") + dest = None + """Where to print to. + + :type: NodeNG or None + """ + values = None + """What to print. + + :type: list(NodeNG) or None + """ + + def __init__(self, nl=None, lineno=None, col_offset=None, parent=None): + """ + :param nl: Whether to print a new line. + :type nl: bool or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.nl = nl + """Whether to print a new line. + + :type: bool or None + """ + + super(Print, self).__init__(lineno, col_offset, parent) + + def postinit(self, dest=None, values=None): + """Do some setup after initialisation. + + :param dest: Where to print to. + :type dest: NodeNG or None + + :param values: What to print. + :type values: list(NodeNG) or None + """ + self.dest = dest + self.values = values + + +class Raise(Statement): + """Class representing an :class:`ast.Raise` node. + + >>> node = astroid.extract_node('raise RuntimeError("Something bad happened!")') + >>> node + + """ + + exc = None + """What is being raised. + + :type: NodeNG or None + """ + _astroid_fields = ("exc", "cause") + cause = None + """The exception being used to raise this one. + + :type: NodeNG or None + """ + + def postinit(self, exc=None, cause=None): + """Do some setup after initialisation. + + :param exc: What is being raised. + :type exc: NodeNG or None + + :param cause: The exception being used to raise this one. + :type cause: NodeNG or None + """ + self.exc = exc + self.cause = cause + + def raises_not_implemented(self): + """Check if this node raises a :class:`NotImplementedError`. + + :returns: True if this node raises a :class:`NotImplementedError`, + False otherwise. + :rtype: bool + """ + if not self.exc: + return False + for name in self.exc._get_name_nodes(): + if name.name == "NotImplementedError": + return True + return False + + def get_children(self): + if self.exc is not None: + yield self.exc + + if self.cause is not None: + yield self.cause + + +class Return(Statement): + """Class representing an :class:`ast.Return` node. + + >>> node = astroid.extract_node('return True') + >>> node + + """ + + _astroid_fields = ("value",) + value = None + """The value being returned. + + :type: NodeNG or None + """ + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: The value being returned. + :type value: NodeNG or None + """ + self.value = value + + def get_children(self): + if self.value is not None: + yield self.value + + def is_tuple_return(self): + return isinstance(self.value, Tuple) + + def _get_return_nodes_skip_functions(self): + yield self + + +class Set(_BaseContainer): + """Class representing an :class:`ast.Set` node. + + >>> node = astroid.extract_node('{1, 2, 3}') + >>> node + + """ + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + return "%s.set" % BUILTINS + + +class Slice(NodeNG): + """Class representing an :class:`ast.Slice` node. + + >>> node = astroid.extract_node('things[1:3]') + >>> node + + >>> node.slice + + """ + + _astroid_fields = ("lower", "upper", "step") + lower = None + """The lower index in the slice. + + :type: NodeNG or None + """ + upper = None + """The upper index in the slice. + + :type: NodeNG or None + """ + step = None + """The step to take between indexes. + + :type: NodeNG or None + """ + + def postinit(self, lower=None, upper=None, step=None): + """Do some setup after initialisation. + + :param lower: The lower index in the slice. + :value lower: NodeNG or None + + :param upper: The upper index in the slice. + :value upper: NodeNG or None + + :param step: The step to take between index. + :param step: NodeNG or None + """ + self.lower = lower + self.upper = upper + self.step = step + + def _wrap_attribute(self, attr): + """Wrap the empty attributes of the Slice in a Const node.""" + if not attr: + const = const_factory(attr) + const.parent = self + return const + return attr + + @decorators.cachedproperty + def _proxied(self): + builtins = MANAGER.builtins_module + return builtins.getattr("slice")[0] + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + return "%s.slice" % BUILTINS + + def igetattr(self, attrname, context=None): + """Infer the possible values of the given attribute on the slice. + + :param attrname: The name of the attribute to infer. + :type attrname: str + + :returns: The inferred possible values. + :rtype: iterable(NodeNG) + """ + if attrname == "start": + yield self._wrap_attribute(self.lower) + elif attrname == "stop": + yield self._wrap_attribute(self.upper) + elif attrname == "step": + yield self._wrap_attribute(self.step) + else: + yield from self.getattr(attrname, context=context) + + def getattr(self, attrname, context=None): + return self._proxied.getattr(attrname, context) + + def get_children(self): + if self.lower is not None: + yield self.lower + + if self.upper is not None: + yield self.upper + + if self.step is not None: + yield self.step + + +class Starred(mixins.ParentAssignTypeMixin, NodeNG): + """Class representing an :class:`ast.Starred` node. + + >>> node = astroid.extract_node('*args') + >>> node + + """ + + _astroid_fields = ("value",) + _other_fields = ("ctx",) + value = None + """What is being unpacked. + + :type: NodeNG or None + """ + + def __init__(self, ctx=None, lineno=None, col_offset=None, parent=None): + """ + :param ctx: Whether the list is assigned to or loaded from. + :type ctx: Context or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.ctx = ctx + """Whether the starred item is assigned to or loaded from. + + :type: Context or None + """ + + super(Starred, self).__init__( + lineno=lineno, col_offset=col_offset, parent=parent + ) + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: What is being unpacked. + :type value: NodeNG or None + """ + self.value = value + + def get_children(self): + yield self.value + + +class Subscript(NodeNG): + """Class representing an :class:`ast.Subscript` node. + + >>> node = astroid.extract_node('things[1:3]') + >>> node + + """ + + _astroid_fields = ("value", "slice") + _other_fields = ("ctx",) + value = None + """What is being indexed. + + :type: NodeNG or None + """ + slice = None + """The slice being used to lookup. + + :type: NodeNG or None + """ + + def __init__(self, ctx=None, lineno=None, col_offset=None, parent=None): + """ + :param ctx: Whether the subscripted item is assigned to or loaded from. + :type ctx: Context or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.ctx = ctx + """Whether the subscripted item is assigned to or loaded from. + + :type: Context or None + """ + + super(Subscript, self).__init__( + lineno=lineno, col_offset=col_offset, parent=parent + ) + + # pylint: disable=redefined-builtin; had to use the same name as builtin ast module. + def postinit(self, value=None, slice=None): + """Do some setup after initialisation. + + :param value: What is being indexed. + :type value: NodeNG or None + + :param slice: The slice being used to lookup. + :type slice: NodeNG or None + """ + self.value = value + self.slice = slice + + def get_children(self): + yield self.value + yield self.slice + + +class TryExcept(mixins.MultiLineBlockMixin, mixins.BlockRangeMixIn, Statement): + """Class representing an :class:`ast.TryExcept` node. + + >>> node = astroid.extract_node(''' + try: + do_something() + except Exception as error: + print("Error!") + ''') + >>> node + + """ + + _astroid_fields = ("body", "handlers", "orelse") + _multi_line_block_fields = ("body", "handlers", "orelse") + body = None + """The contents of the block to catch exceptions from. + + :type: list(NodeNG) or None + """ + handlers = None + """The exception handlers. + + :type: list(ExceptHandler) or None + """ + orelse = None + """The contents of the ``else`` block. + + :type: list(NodeNG) or None + """ + + def postinit(self, body=None, handlers=None, orelse=None): + """Do some setup after initialisation. + + :param body: The contents of the block to catch exceptions from. + :type body: list(NodeNG) or None + + :param handlers: The exception handlers. + :type handlers: list(ExceptHandler) or None + + :param orelse: The contents of the ``else`` block. + :type orelse: list(NodeNG) or None + """ + self.body = body + self.handlers = handlers + self.orelse = orelse + + def _infer_name(self, frame, name): + return name + + def block_range(self, lineno): + """Get a range from the given line number to where this node ends. + + :param lineno: The line number to start the range at. + :type lineno: int + + :returns: The range of line numbers that this node belongs to, + starting at the given line number. + :rtype: tuple(int, int) + """ + last = None + for exhandler in self.handlers: + if exhandler.type and lineno == exhandler.type.fromlineno: + return lineno, lineno + if exhandler.body[0].fromlineno <= lineno <= exhandler.body[-1].tolineno: + return lineno, exhandler.body[-1].tolineno + if last is None: + last = exhandler.body[0].fromlineno - 1 + return self._elsed_block_range(lineno, self.orelse, last) + + def get_children(self): + yield from self.body + + yield from self.handlers or () + yield from self.orelse or () + + +class TryFinally(mixins.MultiLineBlockMixin, mixins.BlockRangeMixIn, Statement): + """Class representing an :class:`ast.TryFinally` node. + + >>> node = astroid.extract_node(''' + try: + do_something() + except Exception as error: + print("Error!") + finally: + print("Cleanup!") + ''') + >>> node + + """ + + _astroid_fields = ("body", "finalbody") + _multi_line_block_fields = ("body", "finalbody") + body = None + """The try-except that the finally is attached to. + + :type: list(TryExcept) or None + """ + finalbody = None + """The contents of the ``finally`` block. + + :type: list(NodeNG) or None + """ + + def postinit(self, body=None, finalbody=None): + """Do some setup after initialisation. + + :param body: The try-except that the finally is attached to. + :type body: list(TryExcept) or None + + :param finalbody: The contents of the ``finally`` block. + :type finalbody: list(NodeNG) or None + """ + self.body = body + self.finalbody = finalbody + + def block_range(self, lineno): + """Get a range from the given line number to where this node ends. + + :param lineno: The line number to start the range at. + :type lineno: int + + :returns: The range of line numbers that this node belongs to, + starting at the given line number. + :rtype: tuple(int, int) + """ + child = self.body[0] + # py2.5 try: except: finally: + if ( + isinstance(child, TryExcept) + and child.fromlineno == self.fromlineno + and child.tolineno >= lineno > self.fromlineno + ): + return child.block_range(lineno) + return self._elsed_block_range(lineno, self.finalbody) + + def get_children(self): + yield from self.body + yield from self.finalbody + + +class Tuple(_BaseContainer): + """Class representing an :class:`ast.Tuple` node. + + >>> node = astroid.extract_node('(1, 2, 3)') + >>> node + + """ + + _other_fields = ("ctx",) + + def __init__(self, ctx=None, lineno=None, col_offset=None, parent=None): + """ + :param ctx: Whether the tuple is assigned to or loaded from. + :type ctx: Context or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.ctx = ctx + """Whether the tuple is assigned to or loaded from. + + :type: Context or None + """ + + super(Tuple, self).__init__(lineno, col_offset, parent) + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + return "%s.tuple" % BUILTINS + + def getitem(self, index, context=None): + """Get an item from this node. + + :param index: The node to use as a subscript index. + :type index: Const or Slice + """ + return _container_getitem(self, self.elts, index, context=context) + + +class UnaryOp(NodeNG): + """Class representing an :class:`ast.UnaryOp` node. + + >>> node = astroid.extract_node('-5') + >>> node + + """ + + _astroid_fields = ("operand",) + _other_fields = ("op",) + operand = None + """What the unary operator is applied to. + + :type: NodeNG or None + """ + + def __init__(self, op=None, lineno=None, col_offset=None, parent=None): + """ + :param op: The operator. + :type: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.op = op + """The operator. + + :type: str or None + """ + + super(UnaryOp, self).__init__(lineno, col_offset, parent) + + def postinit(self, operand=None): + """Do some setup after initialisation. + + :param operand: What the unary operator is applied to. + :type operand: NodeNG or None + """ + self.operand = operand + + # This is set by inference.py + def _infer_unaryop(self, context=None): + raise NotImplementedError + + def type_errors(self, context=None): + """Get a list of type errors which can occur during inference. + + Each TypeError is represented by a :class:`BadBinaryOperationMessage`, + which holds the original exception. + + :returns: The list of possible type errors. + :rtype: list(BadBinaryOperationMessage) + """ + try: + results = self._infer_unaryop(context=context) + return [ + result + for result in results + if isinstance(result, util.BadUnaryOperationMessage) + ] + except exceptions.InferenceError: + return [] + + def get_children(self): + yield self.operand + + def op_precedence(self): + if self.op == "not": + return OP_PRECEDENCE[self.op] + + return super().op_precedence() + + +class While(mixins.MultiLineBlockMixin, mixins.BlockRangeMixIn, Statement): + """Class representing an :class:`ast.While` node. + + >>> node = astroid.extract_node(''' + while condition(): + print("True") + ''') + >>> node + + """ + + _astroid_fields = ("test", "body", "orelse") + _multi_line_block_fields = ("body", "orelse") + test = None + """The condition that the loop tests. + + :type: NodeNG or None + """ + body = None + """The contents of the loop. + + :type: list(NodeNG) or None + """ + orelse = None + """The contents of the ``else`` block. + + :type: list(NodeNG) or None + """ + + def postinit(self, test=None, body=None, orelse=None): + """Do some setup after initialisation. + + :param test: The condition that the loop tests. + :type test: NodeNG or None + + :param body: The contents of the loop. + :type body: list(NodeNG) or None + + :param orelse: The contents of the ``else`` block. + :type orelse: list(NodeNG) or None + """ + self.test = test + self.body = body + self.orelse = orelse + + @decorators.cachedproperty + def blockstart_tolineno(self): + """The line on which the beginning of this block ends. + + :type: int + """ + return self.test.tolineno + + def block_range(self, lineno): + """Get a range from the given line number to where this node ends. + + :param lineno: The line number to start the range at. + :type lineno: int + + :returns: The range of line numbers that this node belongs to, + starting at the given line number. + :rtype: tuple(int, int) + """ + return self._elsed_block_range(lineno, self.orelse) + + def get_children(self): + yield self.test + + yield from self.body + yield from self.orelse + + +class With( + mixins.MultiLineBlockMixin, + mixins.BlockRangeMixIn, + mixins.AssignTypeMixin, + Statement, +): + """Class representing an :class:`ast.With` node. + + >>> node = astroid.extract_node(''' + with open(file_path) as file_: + print(file_.read()) + ''') + >>> node + + """ + + _astroid_fields = ("items", "body") + _other_other_fields = ("type_annotation",) + _multi_line_block_fields = ("body",) + items = None + """The pairs of context managers and the names they are assigned to. + + :type: list(tuple(NodeNG, AssignName or None)) or None + """ + body = None + """The contents of the ``with`` block. + + :type: list(NodeNG) or None + """ + type_annotation = None + """If present, this will contain the type annotation passed by a type comment + + :type: NodeNG or None + """ + + def postinit(self, items=None, body=None, type_annotation=None): + """Do some setup after initialisation. + + :param items: The pairs of context managers and the names + they are assigned to. + :type items: list(tuple(NodeNG, AssignName or None)) or None + + :param body: The contents of the ``with`` block. + :type body: list(NodeNG) or None + """ + self.items = items + self.body = body + self.type_annotation = type_annotation + + @decorators.cachedproperty + def blockstart_tolineno(self): + """The line on which the beginning of this block ends. + + :type: int + """ + return self.items[-1][0].tolineno + + def get_children(self): + """Get the child nodes below this node. + + :returns: The children. + :rtype: iterable(NodeNG) + """ + for expr, var in self.items: + yield expr + if var: + yield var + yield from self.body + + +class AsyncWith(With): + """Asynchronous ``with`` built with the ``async`` keyword.""" + + +class Yield(NodeNG): + """Class representing an :class:`ast.Yield` node. + + >>> node = astroid.extract_node('yield True') + >>> node + + """ + + _astroid_fields = ("value",) + value = None + """The value to yield. + + :type: NodeNG or None + """ + + def postinit(self, value=None): + """Do some setup after initialisation. + + :param value: The value to yield. + :type value: NodeNG or None + """ + self.value = value + + def get_children(self): + if self.value is not None: + yield self.value + + def _get_yield_nodes_skip_lambdas(self): + yield self + + +class YieldFrom(Yield): + """Class representing an :class:`ast.YieldFrom` node.""" + + +class DictUnpack(mixins.NoChildrenMixin, NodeNG): + """Represents the unpacking of dicts into dicts using :pep:`448`.""" + + +class FormattedValue(NodeNG): + """Class representing an :class:`ast.FormattedValue` node. + + Represents a :pep:`498` format string. + + >>> node = astroid.extract_node('f"Format {type_}"') + >>> node + + >>> node.values + [, ] + """ + + _astroid_fields = ("value", "format_spec") + value = None + """The value to be formatted into the string. + + :type: NodeNG or None + """ + conversion = None + """The type of formatting to be applied to the value. + + .. seealso:: + :class:`ast.FormattedValue` + + :type: int or None + """ + format_spec = None + """The formatting to be applied to the value. + + .. seealso:: + :class:`ast.FormattedValue` + + :type: JoinedStr or None + """ + + def postinit(self, value, conversion=None, format_spec=None): + """Do some setup after initialisation. + + :param value: The value to be formatted into the string. + :type value: NodeNG + + :param conversion: The type of formatting to be applied to the value. + :type conversion: int or None + + :param format_spec: The formatting to be applied to the value. + :type format_spec: JoinedStr or None + """ + self.value = value + self.conversion = conversion + self.format_spec = format_spec + + def get_children(self): + yield self.value + + if self.format_spec is not None: + yield self.format_spec + + +class JoinedStr(NodeNG): + """Represents a list of string expressions to be joined. + + >>> node = astroid.extract_node('f"Format {type_}"') + >>> node + + """ + + _astroid_fields = ("values",) + values = None + """The string expressions to be joined. + + :type: list(FormattedValue or Const) or None + """ + + def postinit(self, values=None): + """Do some setup after initialisation. + + :param value: The string expressions to be joined. + + :type: list(FormattedValue or Const) or None + """ + self.values = values + + def get_children(self): + yield from self.values + + +class Unknown(mixins.AssignTypeMixin, NodeNG): + """This node represents a node in a constructed AST where + introspection is not possible. At the moment, it's only used in + the args attribute of FunctionDef nodes where function signature + introspection failed. + """ + + name = "Unknown" + + def qname(self): + return "Unknown" + + def infer(self, context=None, **kwargs): + """Inference on an Unknown node immediately terminates.""" + yield util.Uninferable + + +# constants ############################################################## + +CONST_CLS = { + list: List, + tuple: Tuple, + dict: Dict, + set: Set, + type(None): Const, + type(NotImplemented): Const, +} + + +def _update_const_classes(): + """update constant classes, so the keys of CONST_CLS can be reused""" + klasses = (bool, int, float, complex, str, bytes) + for kls in klasses: + CONST_CLS[kls] = Const + + +_update_const_classes() + + +def _two_step_initialization(cls, value): + instance = cls() + instance.postinit(value) + return instance + + +def _dict_initialization(cls, value): + if isinstance(value, dict): + value = tuple(value.items()) + return _two_step_initialization(cls, value) + + +_CONST_CLS_CONSTRUCTORS = { + List: _two_step_initialization, + Tuple: _two_step_initialization, + Dict: _dict_initialization, + Set: _two_step_initialization, + Const: lambda cls, value: cls(value), +} + + +def const_factory(value): + """return an astroid node for a python value""" + # XXX we should probably be stricter here and only consider stuff in + # CONST_CLS or do better treatment: in case where value is not in CONST_CLS, + # we should rather recall the builder on this value than returning an empty + # node (another option being that const_factory shouldn't be called with something + # not in CONST_CLS) + assert not isinstance(value, NodeNG) + + # Hack for ignoring elements of a sequence + # or a mapping, in order to avoid transforming + # each element to an AST. This is fixed in 2.0 + # and this approach is a temporary hack. + if isinstance(value, (list, set, tuple, dict)): + elts = [] + else: + elts = value + + try: + initializer_cls = CONST_CLS[value.__class__] + initializer = _CONST_CLS_CONSTRUCTORS[initializer_cls] + return initializer(initializer_cls, elts) + except (KeyError, AttributeError): + node = EmptyNode() + node.object = value + return node + + +def is_from_decorator(node): + """Return True if the given node is the child of a decorator""" + parent = node.parent + while parent is not None: + if isinstance(parent, Decorators): + return True + parent = parent.parent + return False diff --git a/venv/lib/python3.7/site-packages/astroid/nodes.py b/venv/lib/python3.7/site-packages/astroid/nodes.py new file mode 100644 index 0000000..2067259 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/nodes.py @@ -0,0 +1,173 @@ +# Copyright (c) 2006-2011, 2013 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2010 Daniel Harding +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016 Jared Garst +# Copyright (c) 2017 Ashley Whetter +# Copyright (c) 2017 rr- +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Every available node class. + +.. seealso:: + :doc:`ast documentation ` + +All nodes inherit from :class:`~astroid.node_classes.NodeNG`. +""" +# pylint: disable=unused-import,redefined-builtin + +from astroid.node_classes import ( + Arguments, + AssignAttr, + Assert, + Assign, + AnnAssign, + AssignName, + AugAssign, + Repr, + BinOp, + BoolOp, + Break, + Call, + Compare, + Comprehension, + Const, + Continue, + Decorators, + DelAttr, + DelName, + Delete, + Dict, + Expr, + Ellipsis, + EmptyNode, + ExceptHandler, + Exec, + ExtSlice, + For, + ImportFrom, + Attribute, + Global, + If, + IfExp, + Import, + Index, + Keyword, + List, + Name, + Nonlocal, + Pass, + Print, + Raise, + Return, + Set, + Slice, + Starred, + Subscript, + TryExcept, + TryFinally, + Tuple, + UnaryOp, + While, + With, + Yield, + YieldFrom, + const_factory, + AsyncFor, + Await, + AsyncWith, + FormattedValue, + JoinedStr, + # Node not present in the builtin ast module. + DictUnpack, + Unknown, +) +from astroid.scoped_nodes import ( + Module, + GeneratorExp, + Lambda, + DictComp, + ListComp, + SetComp, + FunctionDef, + ClassDef, + AsyncFunctionDef, +) + + +ALL_NODE_CLASSES = ( + AsyncFunctionDef, + AsyncFor, + AsyncWith, + Await, + Arguments, + AssignAttr, + Assert, + Assign, + AnnAssign, + AssignName, + AugAssign, + Repr, + BinOp, + BoolOp, + Break, + Call, + ClassDef, + Compare, + Comprehension, + Const, + Continue, + Decorators, + DelAttr, + DelName, + Delete, + Dict, + DictComp, + DictUnpack, + Expr, + Ellipsis, + EmptyNode, + ExceptHandler, + Exec, + ExtSlice, + For, + ImportFrom, + FunctionDef, + Attribute, + GeneratorExp, + Global, + If, + IfExp, + Import, + Index, + Keyword, + Lambda, + List, + ListComp, + Name, + Nonlocal, + Module, + Pass, + Print, + Raise, + Return, + Set, + SetComp, + Slice, + Starred, + Subscript, + TryExcept, + TryFinally, + Tuple, + UnaryOp, + While, + With, + Yield, + YieldFrom, + FormattedValue, + JoinedStr, +) diff --git a/venv/lib/python3.7/site-packages/astroid/objects.py b/venv/lib/python3.7/site-packages/astroid/objects.py new file mode 100644 index 0000000..888ca36 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/objects.py @@ -0,0 +1,282 @@ +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +""" +Inference objects are a way to represent composite AST nodes, +which are used only as inference results, so they can't be found in the +original AST tree. For instance, inferring the following frozenset use, +leads to an inferred FrozenSet: + + Call(func=Name('frozenset'), args=Tuple(...)) +""" + +import builtins + +from astroid import bases +from astroid import decorators +from astroid import exceptions +from astroid import MANAGER +from astroid import node_classes +from astroid import scoped_nodes +from astroid import util + + +BUILTINS = builtins.__name__ +objectmodel = util.lazy_import("interpreter.objectmodel") + + +class FrozenSet(node_classes._BaseContainer): + """class representing a FrozenSet composite node""" + + def pytype(self): + return "%s.frozenset" % BUILTINS + + def _infer(self, context=None): + yield self + + @decorators.cachedproperty + def _proxied(self): # pylint: disable=method-hidden + ast_builtins = MANAGER.builtins_module + return ast_builtins.getattr("frozenset")[0] + + +class Super(node_classes.NodeNG): + """Proxy class over a super call. + + This class offers almost the same behaviour as Python's super, + which is MRO lookups for retrieving attributes from the parents. + + The *mro_pointer* is the place in the MRO from where we should + start looking, not counting it. *mro_type* is the object which + provides the MRO, it can be both a type or an instance. + *self_class* is the class where the super call is, while + *scope* is the function where the super call is. + """ + + # pylint: disable=unnecessary-lambda + special_attributes = util.lazy_descriptor(lambda: objectmodel.SuperModel()) + + # pylint: disable=super-init-not-called + def __init__(self, mro_pointer, mro_type, self_class, scope): + self.type = mro_type + self.mro_pointer = mro_pointer + self._class_based = False + self._self_class = self_class + self._scope = scope + + def _infer(self, context=None): + yield self + + def super_mro(self): + """Get the MRO which will be used to lookup attributes in this super.""" + if not isinstance(self.mro_pointer, scoped_nodes.ClassDef): + raise exceptions.SuperError( + "The first argument to super must be a subtype of " + "type, not {mro_pointer}.", + super_=self, + ) + + if isinstance(self.type, scoped_nodes.ClassDef): + # `super(type, type)`, most likely in a class method. + self._class_based = True + mro_type = self.type + else: + mro_type = getattr(self.type, "_proxied", None) + if not isinstance(mro_type, (bases.Instance, scoped_nodes.ClassDef)): + raise exceptions.SuperError( + "The second argument to super must be an " + "instance or subtype of type, not {type}.", + super_=self, + ) + + if not mro_type.newstyle: + raise exceptions.SuperError( + "Unable to call super on old-style classes.", super_=self + ) + + mro = mro_type.mro() + if self.mro_pointer not in mro: + raise exceptions.SuperError( + "The second argument to super must be an " + "instance or subtype of type, not {type}.", + super_=self, + ) + + index = mro.index(self.mro_pointer) + return mro[index + 1 :] + + @decorators.cachedproperty + def _proxied(self): + ast_builtins = MANAGER.builtins_module + return ast_builtins.getattr("super")[0] + + def pytype(self): + return "%s.super" % BUILTINS + + def display_type(self): + return "Super of" + + @property + def name(self): + """Get the name of the MRO pointer.""" + return self.mro_pointer.name + + def qname(self): + return "super" + + def igetattr(self, name, context=None): + """Retrieve the inferred values of the given attribute name.""" + + if name in self.special_attributes: + yield self.special_attributes.lookup(name) + return + + try: + mro = self.super_mro() + # Don't let invalid MROs or invalid super calls + # leak out as is from this function. + except exceptions.SuperError as exc: + raise exceptions.AttributeInferenceError( + ( + "Lookup for {name} on {target!r} because super call {super!r} " + "is invalid." + ), + target=self, + attribute=name, + context=context, + super_=exc.super_, + ) from exc + except exceptions.MroError as exc: + raise exceptions.AttributeInferenceError( + ( + "Lookup for {name} on {target!r} failed because {cls!r} has an " + "invalid MRO." + ), + target=self, + attribute=name, + context=context, + mros=exc.mros, + cls=exc.cls, + ) from exc + found = False + for cls in mro: + if name not in cls.locals: + continue + + found = True + for inferred in bases._infer_stmts([cls[name]], context, frame=self): + if not isinstance(inferred, scoped_nodes.FunctionDef): + yield inferred + continue + + # We can obtain different descriptors from a super depending + # on what we are accessing and where the super call is. + if inferred.type == "classmethod": + yield bases.BoundMethod(inferred, cls) + elif self._scope.type == "classmethod" and inferred.type == "method": + yield inferred + elif self._class_based or inferred.type == "staticmethod": + yield inferred + elif bases._is_property(inferred): + # TODO: support other descriptors as well. + try: + yield from inferred.infer_call_result(self, context) + except exceptions.InferenceError: + yield util.Uninferable + else: + yield bases.BoundMethod(inferred, cls) + + if not found: + raise exceptions.AttributeInferenceError( + target=self, attribute=name, context=context + ) + + def getattr(self, name, context=None): + return list(self.igetattr(name, context=context)) + + +class ExceptionInstance(bases.Instance): + """Class for instances of exceptions + + It has special treatment for some of the exceptions's attributes, + which are transformed at runtime into certain concrete objects, such as + the case of .args. + """ + + @decorators.cachedproperty + def special_attributes(self): + qname = self.qname() + instance = objectmodel.BUILTIN_EXCEPTIONS.get( + qname, objectmodel.ExceptionInstanceModel + ) + return instance()(self) + + +class DictInstance(bases.Instance): + """Special kind of instances for dictionaries + + This instance knows the underlying object model of the dictionaries, which means + that methods such as .values or .items can be properly inferred. + """ + + # pylint: disable=unnecessary-lambda + special_attributes = util.lazy_descriptor(lambda: objectmodel.DictModel()) + + +# Custom objects tailored for dictionaries, which are used to +# disambiguate between the types of Python 2 dict's method returns +# and Python 3 (where they return set like objects). +class DictItems(bases.Proxy): + __str__ = node_classes.NodeNG.__str__ + __repr__ = node_classes.NodeNG.__repr__ + + +class DictKeys(bases.Proxy): + __str__ = node_classes.NodeNG.__str__ + __repr__ = node_classes.NodeNG.__repr__ + + +class DictValues(bases.Proxy): + __str__ = node_classes.NodeNG.__str__ + __repr__ = node_classes.NodeNG.__repr__ + + +class PartialFunction(scoped_nodes.FunctionDef): + """A class representing partial function obtained via functools.partial""" + + def __init__( + self, call, name=None, doc=None, lineno=None, col_offset=None, parent=None + ): + super().__init__(name, doc, lineno, col_offset, parent) + self.filled_positionals = len(call.positional_arguments[1:]) + self.filled_args = call.positional_arguments[1:] + self.filled_keywords = call.keyword_arguments + + def infer_call_result(self, caller=None, context=None): + if context: + current_passed_keywords = { + keyword for (keyword, _) in context.callcontext.keywords + } + for keyword, value in self.filled_keywords.items(): + if keyword not in current_passed_keywords: + context.callcontext.keywords.append((keyword, value)) + + call_context_args = context.callcontext.args or [] + context.callcontext.args = self.filled_args + call_context_args + + return super().infer_call_result(caller=caller, context=context) + + def qname(self): + return self.__class__.__name__ + + +# TODO: Hack to solve the circular import problem between node_classes and objects +# This is not needed in 2.0, which has a cleaner design overall +node_classes.Dict.__bases__ = (node_classes.NodeNG, DictInstance) diff --git a/venv/lib/python3.7/site-packages/astroid/protocols.py b/venv/lib/python3.7/site-packages/astroid/protocols.py new file mode 100644 index 0000000..db0f5d9 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/protocols.py @@ -0,0 +1,755 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2009-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Dmitry Pribysh +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2017-2018 Ashley Whetter +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2017 rr- +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 HoverHell + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""this module contains a set of functions to handle python protocols for nodes +where it makes sense. +""" + +import collections +import operator as operator_mod +import sys + +import itertools + +from astroid import Store +from astroid import arguments +from astroid import bases +from astroid import context as contextmod +from astroid import exceptions +from astroid import decorators +from astroid import node_classes +from astroid import helpers +from astroid import nodes +from astroid import util + +raw_building = util.lazy_import("raw_building") +objects = util.lazy_import("objects") + + +def _reflected_name(name): + return "__r" + name[2:] + + +def _augmented_name(name): + return "__i" + name[2:] + + +_CONTEXTLIB_MGR = "contextlib.contextmanager" +BIN_OP_METHOD = { + "+": "__add__", + "-": "__sub__", + "/": "__truediv__", + "//": "__floordiv__", + "*": "__mul__", + "**": "__pow__", + "%": "__mod__", + "&": "__and__", + "|": "__or__", + "^": "__xor__", + "<<": "__lshift__", + ">>": "__rshift__", + "@": "__matmul__", +} + +REFLECTED_BIN_OP_METHOD = { + key: _reflected_name(value) for (key, value) in BIN_OP_METHOD.items() +} +AUGMENTED_OP_METHOD = { + key + "=": _augmented_name(value) for (key, value) in BIN_OP_METHOD.items() +} + +UNARY_OP_METHOD = { + "+": "__pos__", + "-": "__neg__", + "~": "__invert__", + "not": None, # XXX not '__nonzero__' +} +_UNARY_OPERATORS = { + "+": operator_mod.pos, + "-": operator_mod.neg, + "~": operator_mod.invert, + "not": operator_mod.not_, +} + + +def _infer_unary_op(obj, op): + func = _UNARY_OPERATORS[op] + value = func(obj) + return nodes.const_factory(value) + + +nodes.Tuple.infer_unary_op = lambda self, op: _infer_unary_op(tuple(self.elts), op) +nodes.List.infer_unary_op = lambda self, op: _infer_unary_op(self.elts, op) +nodes.Set.infer_unary_op = lambda self, op: _infer_unary_op(set(self.elts), op) +nodes.Const.infer_unary_op = lambda self, op: _infer_unary_op(self.value, op) +nodes.Dict.infer_unary_op = lambda self, op: _infer_unary_op(dict(self.items), op) + +# Binary operations + +BIN_OP_IMPL = { + "+": lambda a, b: a + b, + "-": lambda a, b: a - b, + "/": lambda a, b: a / b, + "//": lambda a, b: a // b, + "*": lambda a, b: a * b, + "**": lambda a, b: a ** b, + "%": lambda a, b: a % b, + "&": lambda a, b: a & b, + "|": lambda a, b: a | b, + "^": lambda a, b: a ^ b, + "<<": lambda a, b: a << b, + ">>": lambda a, b: a >> b, +} +if sys.version_info >= (3, 5): + # MatMult is available since Python 3.5+. + BIN_OP_IMPL["@"] = operator_mod.matmul + +for _KEY, _IMPL in list(BIN_OP_IMPL.items()): + BIN_OP_IMPL[_KEY + "="] = _IMPL + + +@decorators.yes_if_nothing_inferred +def const_infer_binary_op(self, opnode, operator, other, context, _): + not_implemented = nodes.Const(NotImplemented) + if isinstance(other, nodes.Const): + try: + impl = BIN_OP_IMPL[operator] + try: + yield nodes.const_factory(impl(self.value, other.value)) + except TypeError: + # ArithmeticError is not enough: float >> float is a TypeError + yield not_implemented + except Exception: # pylint: disable=broad-except + yield util.Uninferable + except TypeError: + yield not_implemented + elif isinstance(self.value, str) and operator == "%": + # TODO(cpopa): implement string interpolation later on. + yield util.Uninferable + else: + yield not_implemented + + +nodes.Const.infer_binary_op = const_infer_binary_op + + +def _multiply_seq_by_int(self, opnode, other, context): + node = self.__class__(parent=opnode) + filtered_elts = ( + helpers.safe_infer(elt, context) or util.Uninferable + for elt in self.elts + if elt is not util.Uninferable + ) + node.elts = list(filtered_elts) * other.value + return node + + +def _filter_uninferable_nodes(elts, context): + for elt in elts: + if elt is util.Uninferable: + yield nodes.Unknown() + else: + for inferred in elt.infer(context): + if inferred is not util.Uninferable: + yield inferred + else: + yield nodes.Unknown() + + +@decorators.yes_if_nothing_inferred +def tl_infer_binary_op(self, opnode, operator, other, context, method): + not_implemented = nodes.Const(NotImplemented) + if isinstance(other, self.__class__) and operator == "+": + node = self.__class__(parent=opnode) + node.elts = list( + itertools.chain( + _filter_uninferable_nodes(self.elts, context), + _filter_uninferable_nodes(other.elts, context), + ) + ) + yield node + elif isinstance(other, nodes.Const) and operator == "*": + if not isinstance(other.value, int): + yield not_implemented + return + yield _multiply_seq_by_int(self, opnode, other, context) + elif isinstance(other, bases.Instance) and operator == "*": + # Verify if the instance supports __index__. + as_index = helpers.class_instance_as_index(other) + if not as_index: + yield util.Uninferable + else: + yield _multiply_seq_by_int(self, opnode, as_index, context) + else: + yield not_implemented + + +nodes.Tuple.infer_binary_op = tl_infer_binary_op +nodes.List.infer_binary_op = tl_infer_binary_op + + +@decorators.yes_if_nothing_inferred +def instance_class_infer_binary_op(self, opnode, operator, other, context, method): + return method.infer_call_result(self, context) + + +bases.Instance.infer_binary_op = instance_class_infer_binary_op +nodes.ClassDef.infer_binary_op = instance_class_infer_binary_op + + +# assignment ################################################################## + +"""the assigned_stmts method is responsible to return the assigned statement +(e.g. not inferred) according to the assignment type. + +The `assign_path` argument is used to record the lhs path of the original node. +For instance if we want assigned statements for 'c' in 'a, (b,c)', assign_path +will be [1, 1] once arrived to the Assign node. + +The `context` argument is the current inference context which should be given +to any intermediary inference necessary. +""" + + +def _resolve_looppart(parts, assign_path, context): + """recursive function to resolve multiple assignments on loops""" + assign_path = assign_path[:] + index = assign_path.pop(0) + for part in parts: + if part is util.Uninferable: + continue + if not hasattr(part, "itered"): + continue + try: + itered = part.itered() + except TypeError: + continue + for stmt in itered: + index_node = nodes.Const(index) + try: + assigned = stmt.getitem(index_node, context) + except ( + AttributeError, + exceptions.AstroidTypeError, + exceptions.AstroidIndexError, + ): + continue + if not assign_path: + # we achieved to resolved the assignment path, + # don't infer the last part + yield assigned + elif assigned is util.Uninferable: + break + else: + # we are not yet on the last part of the path + # search on each possibly inferred value + try: + yield from _resolve_looppart( + assigned.infer(context), assign_path, context + ) + except exceptions.InferenceError: + break + + +@decorators.raise_if_nothing_inferred +def for_assigned_stmts(self, node=None, context=None, assign_path=None): + if isinstance(self, nodes.AsyncFor) or getattr(self, "is_async", False): + # Skip inferring of async code for now + return dict(node=self, unknown=node, assign_path=assign_path, context=context) + if assign_path is None: + for lst in self.iter.infer(context): + if isinstance(lst, (nodes.Tuple, nodes.List)): + yield from lst.elts + else: + yield from _resolve_looppart(self.iter.infer(context), assign_path, context) + return dict(node=self, unknown=node, assign_path=assign_path, context=context) + + +nodes.For.assigned_stmts = for_assigned_stmts +nodes.Comprehension.assigned_stmts = for_assigned_stmts + + +def sequence_assigned_stmts(self, node=None, context=None, assign_path=None): + if assign_path is None: + assign_path = [] + try: + index = self.elts.index(node) + except ValueError as exc: + raise exceptions.InferenceError( + "Tried to retrieve a node {node!r} which does not exist", + node=self, + assign_path=assign_path, + context=context, + ) from exc + + assign_path.insert(0, index) + return self.parent.assigned_stmts( + node=self, context=context, assign_path=assign_path + ) + + +nodes.Tuple.assigned_stmts = sequence_assigned_stmts +nodes.List.assigned_stmts = sequence_assigned_stmts + + +def assend_assigned_stmts(self, node=None, context=None, assign_path=None): + return self.parent.assigned_stmts(node=self, context=context) + + +nodes.AssignName.assigned_stmts = assend_assigned_stmts +nodes.AssignAttr.assigned_stmts = assend_assigned_stmts + + +def _arguments_infer_argname(self, name, context): + # arguments information may be missing, in which case we can't do anything + # more + if not (self.args or self.vararg or self.kwarg): + yield util.Uninferable + return + # first argument of instance/class method + if self.args and getattr(self.args[0], "name", None) == name: + functype = self.parent.type + cls = self.parent.parent.scope() + is_metaclass = isinstance(cls, nodes.ClassDef) and cls.type == "metaclass" + # If this is a metaclass, then the first argument will always + # be the class, not an instance. + if is_metaclass or functype == "classmethod": + yield cls + return + if functype == "method": + yield bases.Instance(cls) + return + + if context and context.callcontext: + call_site = arguments.CallSite(context.callcontext, context.extra_context) + yield from call_site.infer_argument(self.parent, name, context) + return + + if name == self.vararg: + vararg = nodes.const_factory(()) + vararg.parent = self + yield vararg + return + if name == self.kwarg: + kwarg = nodes.const_factory({}) + kwarg.parent = self + yield kwarg + return + # if there is a default value, yield it. And then yield Uninferable to reflect + # we can't guess given argument value + try: + context = contextmod.copy_context(context) + yield from self.default_value(name).infer(context) + yield util.Uninferable + except exceptions.NoDefault: + yield util.Uninferable + + +def arguments_assigned_stmts(self, node=None, context=None, assign_path=None): + if context.callcontext: + # reset call context/name + callcontext = context.callcontext + context = contextmod.copy_context(context) + context.callcontext = None + args = arguments.CallSite(callcontext) + return args.infer_argument(self.parent, node.name, context) + return _arguments_infer_argname(self, node.name, context) + + +nodes.Arguments.assigned_stmts = arguments_assigned_stmts + + +@decorators.raise_if_nothing_inferred +def assign_assigned_stmts(self, node=None, context=None, assign_path=None): + if not assign_path: + yield self.value + return None + yield from _resolve_assignment_parts( + self.value.infer(context), assign_path, context + ) + + return dict(node=self, unknown=node, assign_path=assign_path, context=context) + + +def assign_annassigned_stmts(self, node=None, context=None, assign_path=None): + for inferred in assign_assigned_stmts(self, node, context, assign_path): + if inferred is None: + yield util.Uninferable + else: + yield inferred + + +nodes.Assign.assigned_stmts = assign_assigned_stmts +nodes.AnnAssign.assigned_stmts = assign_annassigned_stmts +nodes.AugAssign.assigned_stmts = assign_assigned_stmts + + +def _resolve_assignment_parts(parts, assign_path, context): + """recursive function to resolve multiple assignments""" + assign_path = assign_path[:] + index = assign_path.pop(0) + for part in parts: + assigned = None + if isinstance(part, nodes.Dict): + # A dictionary in an iterating context + try: + assigned, _ = part.items[index] + except IndexError: + return + + elif hasattr(part, "getitem"): + index_node = nodes.Const(index) + try: + assigned = part.getitem(index_node, context) + except (exceptions.AstroidTypeError, exceptions.AstroidIndexError): + return + + if not assigned: + return + + if not assign_path: + # we achieved to resolved the assignment path, don't infer the + # last part + yield assigned + elif assigned is util.Uninferable: + return + else: + # we are not yet on the last part of the path search on each + # possibly inferred value + try: + yield from _resolve_assignment_parts( + assigned.infer(context), assign_path, context + ) + except exceptions.InferenceError: + return + + +@decorators.raise_if_nothing_inferred +def excepthandler_assigned_stmts(self, node=None, context=None, assign_path=None): + for assigned in node_classes.unpack_infer(self.type): + if isinstance(assigned, nodes.ClassDef): + assigned = objects.ExceptionInstance(assigned) + + yield assigned + return dict(node=self, unknown=node, assign_path=assign_path, context=context) + + +nodes.ExceptHandler.assigned_stmts = excepthandler_assigned_stmts + + +def _infer_context_manager(self, mgr, context): + inferred = next(mgr.infer(context=context)) + if isinstance(inferred, bases.Generator): + # Check if it is decorated with contextlib.contextmanager. + func = inferred.parent + if not func.decorators: + raise exceptions.InferenceError( + "No decorators found on inferred generator %s", node=func + ) + + for decorator_node in func.decorators.nodes: + decorator = next(decorator_node.infer(context)) + if isinstance(decorator, nodes.FunctionDef): + if decorator.qname() == _CONTEXTLIB_MGR: + break + else: + # It doesn't interest us. + raise exceptions.InferenceError(node=func) + + # Get the first yield point. If it has multiple yields, + # then a RuntimeError will be raised. + + possible_yield_points = func.nodes_of_class(nodes.Yield) + # Ignore yields in nested functions + yield_point = next( + (node for node in possible_yield_points if node.scope() == func), None + ) + if yield_point: + if not yield_point.value: + const = nodes.Const(None) + const.parent = yield_point + const.lineno = yield_point.lineno + yield const + else: + yield from yield_point.value.infer(context=context) + elif isinstance(inferred, bases.Instance): + try: + enter = next(inferred.igetattr("__enter__", context=context)) + except (exceptions.InferenceError, exceptions.AttributeInferenceError): + raise exceptions.InferenceError(node=inferred) + if not isinstance(enter, bases.BoundMethod): + raise exceptions.InferenceError(node=enter) + if not context.callcontext: + context.callcontext = contextmod.CallContext(args=[inferred]) + yield from enter.infer_call_result(self, context) + else: + raise exceptions.InferenceError(node=mgr) + + +@decorators.raise_if_nothing_inferred +def with_assigned_stmts(self, node=None, context=None, assign_path=None): + """Infer names and other nodes from a *with* statement. + + This enables only inference for name binding in a *with* statement. + For instance, in the following code, inferring `func` will return + the `ContextManager` class, not whatever ``__enter__`` returns. + We are doing this intentionally, because we consider that the context + manager result is whatever __enter__ returns and what it is binded + using the ``as`` keyword. + + class ContextManager(object): + def __enter__(self): + return 42 + with ContextManager() as f: + pass + + # ContextManager().infer() will return ContextManager + # f.infer() will return 42. + + Arguments: + self: nodes.With + node: The target of the assignment, `as (a, b)` in `with foo as (a, b)`. + context: Inference context used for caching already inferred objects + assign_path: + A list of indices, where each index specifies what item to fetch from + the inference results. + """ + try: + mgr = next(mgr for (mgr, vars) in self.items if vars == node) + except StopIteration: + return None + if assign_path is None: + yield from _infer_context_manager(self, mgr, context) + else: + for result in _infer_context_manager(self, mgr, context): + # Walk the assign_path and get the item at the final index. + obj = result + for index in assign_path: + if not hasattr(obj, "elts"): + raise exceptions.InferenceError( + "Wrong type ({targets!r}) for {node!r} assignment", + node=self, + targets=node, + assign_path=assign_path, + context=context, + ) + try: + obj = obj.elts[index] + except IndexError as exc: + raise exceptions.InferenceError( + "Tried to infer a nonexistent target with index {index} " + "in {node!r}.", + node=self, + targets=node, + assign_path=assign_path, + context=context, + ) from exc + except TypeError as exc: + raise exceptions.InferenceError( + "Tried to unpack a non-iterable value " "in {node!r}.", + node=self, + targets=node, + assign_path=assign_path, + context=context, + ) from exc + yield obj + return dict(node=self, unknown=node, assign_path=assign_path, context=context) + + +nodes.With.assigned_stmts = with_assigned_stmts + + +@decorators.yes_if_nothing_inferred +def starred_assigned_stmts(self, node=None, context=None, assign_path=None): + """ + Arguments: + self: nodes.Starred + node: a node related to the current underlying Node. + context: Inference context used for caching already inferred objects + assign_path: + A list of indices, where each index specifies what item to fetch from + the inference results. + """ + # pylint: disable=too-many-locals,too-many-branches,too-many-statements + def _determine_starred_iteration_lookups(starred, target, lookups): + # Determine the lookups for the rhs of the iteration + itered = target.itered() + for index, element in enumerate(itered): + if ( + isinstance(element, nodes.Starred) + and element.value.name == starred.value.name + ): + lookups.append((index, len(itered))) + break + if isinstance(element, nodes.Tuple): + lookups.append((index, len(element.itered()))) + _determine_starred_iteration_lookups(starred, element, lookups) + + stmt = self.statement() + if not isinstance(stmt, (nodes.Assign, nodes.For)): + raise exceptions.InferenceError( + "Statement {stmt!r} enclosing {node!r} " "must be an Assign or For node.", + node=self, + stmt=stmt, + unknown=node, + context=context, + ) + + if context is None: + context = contextmod.InferenceContext() + + if isinstance(stmt, nodes.Assign): + value = stmt.value + lhs = stmt.targets[0] + + if sum(1 for _ in lhs.nodes_of_class(nodes.Starred)) > 1: + raise exceptions.InferenceError( + "Too many starred arguments in the " " assignment targets {lhs!r}.", + node=self, + targets=lhs, + unknown=node, + context=context, + ) + + try: + rhs = next(value.infer(context)) + except exceptions.InferenceError: + yield util.Uninferable + return + if rhs is util.Uninferable or not hasattr(rhs, "itered"): + yield util.Uninferable + return + + try: + elts = collections.deque(rhs.itered()) + except TypeError: + yield util.Uninferable + return + + # Unpack iteratively the values from the rhs of the assignment, + # until the find the starred node. What will remain will + # be the list of values which the Starred node will represent + # This is done in two steps, from left to right to remove + # anything before the starred node and from right to left + # to remove anything after the starred node. + + for index, left_node in enumerate(lhs.elts): + if not isinstance(left_node, nodes.Starred): + if not elts: + break + elts.popleft() + continue + lhs_elts = collections.deque(reversed(lhs.elts[index:])) + for right_node in lhs_elts: + if not isinstance(right_node, nodes.Starred): + if not elts: + break + elts.pop() + continue + # We're done + packed = nodes.List( + ctx=Store, parent=self, lineno=lhs.lineno, col_offset=lhs.col_offset + ) + packed.postinit(elts=elts) + yield packed + break + + if isinstance(stmt, nodes.For): + try: + inferred_iterable = next(stmt.iter.infer(context=context)) + except exceptions.InferenceError: + yield util.Uninferable + return + if inferred_iterable is util.Uninferable or not hasattr( + inferred_iterable, "itered" + ): + yield util.Uninferable + return + try: + itered = inferred_iterable.itered() + except TypeError: + yield util.Uninferable + return + + target = stmt.target + + if not isinstance(target, nodes.Tuple): + raise exceptions.InferenceError( + "Could not make sense of this, the target must be a tuple", + context=context, + ) + + lookups = [] + _determine_starred_iteration_lookups(self, target, lookups) + if not lookups: + raise exceptions.InferenceError( + "Could not make sense of this, needs at least a lookup", context=context + ) + + # Make the last lookup a slice, since that what we want for a Starred node + last_element_index, last_element_length = lookups[-1] + is_starred_last = last_element_index == (last_element_length - 1) + + lookup_slice = slice( + last_element_index, + None if is_starred_last else (last_element_length - last_element_index), + ) + lookups[-1] = lookup_slice + + for element in itered: + + # We probably want to infer the potential values *for each* element in an + # iterable, but we can't infer a list of all values, when only a list of + # step values are expected: + # + # for a, *b in [...]: + # b + # + # *b* should now point to just the elements at that particular iteration step, + # which astroid can't know about. + + found_element = None + for lookup in lookups: + if not hasattr(element, "itered"): + break + if not isinstance(lookup, slice): + # Grab just the index, not the whole length + lookup = lookup[0] + try: + itered_inner_element = element.itered() + element = itered_inner_element[lookup] + except IndexError: + break + except TypeError: + # Most likely the itered() call failed, cannot make sense of this + yield util.Uninferable + return + else: + found_element = element + + unpacked = nodes.List( + ctx=Store, parent=self, lineno=self.lineno, col_offset=self.col_offset + ) + unpacked.postinit(elts=found_element or []) + yield unpacked + return + + yield util.Uninferable + + +nodes.Starred.assigned_stmts = starred_assigned_stmts diff --git a/venv/lib/python3.7/site-packages/astroid/raw_building.py b/venv/lib/python3.7/site-packages/astroid/raw_building.py new file mode 100644 index 0000000..7707ea1 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/raw_building.py @@ -0,0 +1,449 @@ +# Copyright (c) 2006-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2012 FELD Boris +# Copyright (c) 2014-2018 Claudiu Popa +# Copyright (c) 2014 Google, Inc. +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Florian Bruhin +# Copyright (c) 2015 Ovidiu Sabou +# Copyright (c) 2016 Derek Gustafson +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""this module contains a set of functions to create astroid trees from scratch +(build_* functions) or from living object (object_build_* functions) +""" + +import builtins +import inspect +import logging +import os +import sys +import types + +from astroid import bases +from astroid import manager +from astroid import node_classes +from astroid import nodes + + +MANAGER = manager.AstroidManager() +# the keys of CONST_CLS eg python builtin types + +_CONSTANTS = tuple(node_classes.CONST_CLS) +_BUILTINS = vars(builtins) +_LOG = logging.getLogger(__name__) + + +def _io_discrepancy(member): + # _io module names itself `io`: http://bugs.python.org/issue18602 + member_self = getattr(member, "__self__", None) + return ( + member_self + and inspect.ismodule(member_self) + and member_self.__name__ == "_io" + and member.__module__ == "io" + ) + + +def _attach_local_node(parent, node, name): + node.name = name # needed by add_local_node + parent.add_local_node(node) + + +def _add_dunder_class(func, member): + """Add a __class__ member to the given func node, if we can determine it.""" + python_cls = member.__class__ + cls_name = getattr(python_cls, "__name__", None) + if not cls_name: + return + cls_bases = [ancestor.__name__ for ancestor in python_cls.__bases__] + ast_klass = build_class(cls_name, cls_bases, python_cls.__doc__) + func.instance_attrs["__class__"] = [ast_klass] + + +_marker = object() + + +def attach_dummy_node(node, name, runtime_object=_marker): + """create a dummy node and register it in the locals of the given + node with the specified name + """ + enode = nodes.EmptyNode() + enode.object = runtime_object + _attach_local_node(node, enode, name) + + +def _has_underlying_object(self): + return self.object is not None and self.object is not _marker + + +nodes.EmptyNode.has_underlying_object = _has_underlying_object + + +def attach_const_node(node, name, value): + """create a Const node and register it in the locals of the given + node with the specified name + """ + if name not in node.special_attributes: + _attach_local_node(node, nodes.const_factory(value), name) + + +def attach_import_node(node, modname, membername): + """create a ImportFrom node and register it in the locals of the given + node with the specified name + """ + from_node = nodes.ImportFrom(modname, [(membername, None)]) + _attach_local_node(node, from_node, membername) + + +def build_module(name, doc=None): + """create and initialize an astroid Module node""" + node = nodes.Module(name, doc, pure_python=False) + node.package = False + node.parent = None + return node + + +def build_class(name, basenames=(), doc=None): + """create and initialize an astroid ClassDef node""" + node = nodes.ClassDef(name, doc) + for base in basenames: + basenode = nodes.Name() + basenode.name = base + node.bases.append(basenode) + basenode.parent = node + return node + + +def build_function(name, args=None, defaults=None, doc=None): + """create and initialize an astroid FunctionDef node""" + args, defaults = args or [], defaults or [] + # first argument is now a list of decorators + func = nodes.FunctionDef(name, doc) + func.args = argsnode = nodes.Arguments() + argsnode.args = [] + for arg in args: + argsnode.args.append(nodes.Name()) + argsnode.args[-1].name = arg + argsnode.args[-1].parent = argsnode + argsnode.defaults = [] + for default in defaults: + argsnode.defaults.append(nodes.const_factory(default)) + argsnode.defaults[-1].parent = argsnode + argsnode.kwarg = None + argsnode.vararg = None + argsnode.parent = func + if args: + register_arguments(func) + return func + + +def build_from_import(fromname, names): + """create and initialize an astroid ImportFrom import statement""" + return nodes.ImportFrom(fromname, [(name, None) for name in names]) + + +def register_arguments(func, args=None): + """add given arguments to local + + args is a list that may contains nested lists + (i.e. def func(a, (b, c, d)): ...) + """ + if args is None: + args = func.args.args + if func.args.vararg: + func.set_local(func.args.vararg, func.args) + if func.args.kwarg: + func.set_local(func.args.kwarg, func.args) + for arg in args: + if isinstance(arg, nodes.Name): + func.set_local(arg.name, arg) + else: + register_arguments(func, arg.elts) + + +def object_build_class(node, member, localname): + """create astroid for a living class object""" + basenames = [base.__name__ for base in member.__bases__] + return _base_class_object_build(node, member, basenames, localname=localname) + + +def object_build_function(node, member, localname): + """create astroid for a living function object""" + # pylint: disable=deprecated-method; completely removed in 2.0 + args, varargs, varkw, defaults = inspect.getargspec(member) + if varargs is not None: + args.append(varargs) + if varkw is not None: + args.append(varkw) + func = build_function( + getattr(member, "__name__", None) or localname, args, defaults, member.__doc__ + ) + node.add_local_node(func, localname) + + +def object_build_datadescriptor(node, member, name): + """create astroid for a living data descriptor object""" + return _base_class_object_build(node, member, [], name) + + +def object_build_methoddescriptor(node, member, localname): + """create astroid for a living method descriptor object""" + # FIXME get arguments ? + func = build_function( + getattr(member, "__name__", None) or localname, doc=member.__doc__ + ) + # set node's arguments to None to notice that we have no information, not + # and empty argument list + func.args.args = None + node.add_local_node(func, localname) + _add_dunder_class(func, member) + + +def _base_class_object_build(node, member, basenames, name=None, localname=None): + """create astroid for a living class object, with a given set of base names + (e.g. ancestors) + """ + klass = build_class( + name or getattr(member, "__name__", None) or localname, + basenames, + member.__doc__, + ) + klass._newstyle = isinstance(member, type) + node.add_local_node(klass, localname) + try: + # limit the instantiation trick since it's too dangerous + # (such as infinite test execution...) + # this at least resolves common case such as Exception.args, + # OSError.errno + if issubclass(member, Exception): + instdict = member().__dict__ + else: + raise TypeError + except: # pylint: disable=bare-except + pass + else: + for item_name, obj in instdict.items(): + valnode = nodes.EmptyNode() + valnode.object = obj + valnode.parent = klass + valnode.lineno = 1 + klass.instance_attrs[item_name] = [valnode] + return klass + + +def _build_from_function(node, name, member, module): + # verify this is not an imported function + try: + code = member.__code__ + except AttributeError: + # Some implementations don't provide the code object, + # such as Jython. + code = None + filename = getattr(code, "co_filename", None) + if filename is None: + assert isinstance(member, object) + object_build_methoddescriptor(node, member, name) + elif filename != getattr(module, "__file__", None): + attach_dummy_node(node, name, member) + else: + object_build_function(node, member, name) + + +class InspectBuilder: + """class for building nodes from living object + + this is actually a really minimal representation, including only Module, + FunctionDef and ClassDef nodes and some others as guessed. + """ + + def __init__(self): + self._done = {} + self._module = None + + def inspect_build(self, module, modname=None, path=None): + """build astroid from a living module (i.e. using inspect) + this is used when there is no python source code available (either + because it's a built-in module or because the .py is not available) + """ + self._module = module + if modname is None: + modname = module.__name__ + try: + node = build_module(modname, module.__doc__) + except AttributeError: + # in jython, java modules have no __doc__ (see #109562) + node = build_module(modname) + node.file = node.path = os.path.abspath(path) if path else path + node.name = modname + MANAGER.cache_module(node) + node.package = hasattr(module, "__path__") + self._done = {} + self.object_build(node, module) + return node + + def object_build(self, node, obj): + """recursive method which create a partial ast from real objects + (only function, class, and method are handled) + """ + if obj in self._done: + return self._done[obj] + self._done[obj] = node + for name in dir(obj): + try: + member = getattr(obj, name) + except AttributeError: + # damned ExtensionClass.Base, I know you're there ! + attach_dummy_node(node, name) + continue + if inspect.ismethod(member): + member = member.__func__ + if inspect.isfunction(member): + _build_from_function(node, name, member, self._module) + elif inspect.isbuiltin(member): + if not _io_discrepancy(member) and self.imported_member( + node, member, name + ): + continue + object_build_methoddescriptor(node, member, name) + elif inspect.isclass(member): + if self.imported_member(node, member, name): + continue + if member in self._done: + class_node = self._done[member] + if class_node not in node.locals.get(name, ()): + node.add_local_node(class_node, name) + else: + class_node = object_build_class(node, member, name) + # recursion + self.object_build(class_node, member) + if name == "__class__" and class_node.parent is None: + class_node.parent = self._done[self._module] + elif inspect.ismethoddescriptor(member): + assert isinstance(member, object) + object_build_methoddescriptor(node, member, name) + elif inspect.isdatadescriptor(member): + assert isinstance(member, object) + object_build_datadescriptor(node, member, name) + elif isinstance(member, _CONSTANTS): + attach_const_node(node, name, member) + elif inspect.isroutine(member): + # This should be called for Jython, where some builtin + # methods aren't caught by isbuiltin branch. + _build_from_function(node, name, member, self._module) + else: + # create an empty node so that the name is actually defined + attach_dummy_node(node, name, member) + return None + + def imported_member(self, node, member, name): + """verify this is not an imported class or handle it""" + # /!\ some classes like ExtensionClass doesn't have a __module__ + # attribute ! Also, this may trigger an exception on badly built module + # (see http://www.logilab.org/ticket/57299 for instance) + try: + modname = getattr(member, "__module__", None) + except: # pylint: disable=bare-except + _LOG.exception( + "unexpected error while building " "astroid from living object" + ) + modname = None + if modname is None: + if name in ("__new__", "__subclasshook__"): + # Python 2.5.1 (r251:54863, Sep 1 2010, 22:03:14) + # >>> print object.__new__.__module__ + # None + modname = builtins.__name__ + else: + attach_dummy_node(node, name, member) + return True + + real_name = {"gtk": "gtk_gtk", "_io": "io"}.get(modname, modname) + + if real_name != self._module.__name__: + # check if it sounds valid and then add an import node, else use a + # dummy node + try: + getattr(sys.modules[modname], name) + except (KeyError, AttributeError): + attach_dummy_node(node, name, member) + else: + attach_import_node(node, modname, name) + return True + return False + + +### astroid bootstrapping ###################################################### + +_CONST_PROXY = {} + +# TODO : find a nicer way to handle this situation; +def _set_proxied(const): + return _CONST_PROXY[const.value.__class__] + + +def _astroid_bootstrapping(): + """astroid bootstrapping the builtins module""" + # this boot strapping is necessary since we need the Const nodes to + # inspect_build builtins, and then we can proxy Const + builder = InspectBuilder() + astroid_builtin = builder.inspect_build(builtins) + + # pylint: disable=redefined-outer-name + for cls, node_cls in node_classes.CONST_CLS.items(): + if cls is type(None): + proxy = build_class("NoneType") + proxy.parent = astroid_builtin + elif cls is type(NotImplemented): + proxy = build_class("NotImplementedType") + proxy.parent = astroid_builtin + else: + proxy = astroid_builtin.getattr(cls.__name__)[0] + if cls in (dict, list, set, tuple): + node_cls._proxied = proxy + else: + _CONST_PROXY[cls] = proxy + + # Set the builtin module as parent for some builtins. + nodes.Const._proxied = property(_set_proxied) + + _GeneratorType = nodes.ClassDef( + types.GeneratorType.__name__, types.GeneratorType.__doc__ + ) + _GeneratorType.parent = astroid_builtin + bases.Generator._proxied = _GeneratorType + builder.object_build(bases.Generator._proxied, types.GeneratorType) + + if hasattr(types, "AsyncGeneratorType"): + # pylint: disable=no-member; AsyncGeneratorType + _AsyncGeneratorType = nodes.ClassDef( + types.AsyncGeneratorType.__name__, types.AsyncGeneratorType.__doc__ + ) + _AsyncGeneratorType.parent = astroid_builtin + bases.AsyncGenerator._proxied = _AsyncGeneratorType + builder.object_build(bases.AsyncGenerator._proxied, types.AsyncGeneratorType) + builtin_types = ( + types.GetSetDescriptorType, + types.GeneratorType, + types.MemberDescriptorType, + type(None), + type(NotImplemented), + types.FunctionType, + types.MethodType, + types.BuiltinFunctionType, + types.ModuleType, + types.TracebackType, + ) + for _type in builtin_types: + if _type.__name__ not in astroid_builtin: + cls = nodes.ClassDef(_type.__name__, _type.__doc__) + cls.parent = astroid_builtin + builder.object_build(cls, _type) + astroid_builtin[_type.__name__] = cls + + +_astroid_bootstrapping() diff --git a/venv/lib/python3.7/site-packages/astroid/rebuilder.py b/venv/lib/python3.7/site-packages/astroid/rebuilder.py new file mode 100644 index 0000000..1b313ee --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/rebuilder.py @@ -0,0 +1,1066 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2009-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2013-2018 Claudiu Popa +# Copyright (c) 2013-2014 Google, Inc. +# Copyright (c) 2014 Alexander Presnyakov +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016-2017 Derek Gustafson +# Copyright (c) 2016 Jared Garst +# Copyright (c) 2017 Hugo +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2017 rr- +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 Bryce Guinta + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""this module contains utilities for rebuilding a _ast tree in +order to get a single Astroid representation +""" + +import sys + +import astroid +from astroid._ast import _parse, _get_parser_module, parse_function_type_comment +from astroid import nodes + + +CONST_NAME_TRANSFORMS = {"None": None, "True": True, "False": False} + +REDIRECT = { + "arguments": "Arguments", + "comprehension": "Comprehension", + "ListCompFor": "Comprehension", + "GenExprFor": "Comprehension", + "excepthandler": "ExceptHandler", + "keyword": "Keyword", +} +PY3 = sys.version_info >= (3, 0) +PY34 = sys.version_info >= (3, 4) +PY37 = sys.version_info >= (3, 7) + + +def _binary_operators_from_module(module): + binary_operators = { + module.Add: "+", + module.BitAnd: "&", + module.BitOr: "|", + module.BitXor: "^", + module.Div: "/", + module.FloorDiv: "//", + module.Mod: "%", + module.Mult: "*", + module.Pow: "**", + module.Sub: "-", + module.LShift: "<<", + module.RShift: ">>", + } + if sys.version_info >= (3, 5): + binary_operators[module.MatMult] = "@" + return binary_operators + + +def _bool_operators_from_module(module): + return {module.And: "and", module.Or: "or"} + + +def _unary_operators_from_module(module): + return {module.UAdd: "+", module.USub: "-", module.Not: "not", module.Invert: "~"} + + +def _compare_operators_from_module(module): + return { + module.Eq: "==", + module.Gt: ">", + module.GtE: ">=", + module.In: "in", + module.Is: "is", + module.IsNot: "is not", + module.Lt: "<", + module.LtE: "<=", + module.NotEq: "!=", + module.NotIn: "not in", + } + + +def _contexts_from_module(module): + return { + module.Load: astroid.Load, + module.Store: astroid.Store, + module.Del: astroid.Del, + module.Param: astroid.Store, + } + + +def _visit_or_none(node, attr, visitor, parent, visit="visit", **kws): + """If the given node has an attribute, visits the attribute, and + otherwise returns None. + + """ + value = getattr(node, attr, None) + if value: + return getattr(visitor, visit)(value, parent, **kws) + + return None + + +class TreeRebuilder: + """Rebuilds the _ast tree to become an Astroid tree""" + + def __init__(self, manager, parse_python_two: bool = False): + self._manager = manager + self._global_names = [] + self._import_from_nodes = [] + self._delayed_assattr = [] + self._visit_meths = {} + + # Configure the right classes for the right module + self._parser_module = _get_parser_module(parse_python_two=parse_python_two) + self._unary_op_classes = _unary_operators_from_module(self._parser_module) + self._cmp_op_classes = _compare_operators_from_module(self._parser_module) + self._bool_op_classes = _bool_operators_from_module(self._parser_module) + self._bin_op_classes = _binary_operators_from_module(self._parser_module) + self._context_classes = _contexts_from_module(self._parser_module) + + def _get_doc(self, node): + try: + if PY37 and hasattr(node, "docstring"): + doc = node.docstring + return node, doc + if ( + node.body + and isinstance(node.body[0], self._parser_module.Expr) + and isinstance(node.body[0].value, self._parser_module.Str) + ): + doc = node.body[0].value.s + node.body = node.body[1:] + return node, doc + except IndexError: + pass # ast built from scratch + return node, None + + def _get_context(self, node): + return self._context_classes.get(type(node.ctx), astroid.Load) + + def visit_module(self, node, modname, modpath, package): + """visit a Module node by returning a fresh instance of it""" + node, doc = self._get_doc(node) + newnode = nodes.Module( + name=modname, + doc=doc, + file=modpath, + path=[modpath], + package=package, + parent=None, + ) + newnode.postinit([self.visit(child, newnode) for child in node.body]) + return newnode + + def visit(self, node, parent): + cls = node.__class__ + if cls in self._visit_meths: + visit_method = self._visit_meths[cls] + else: + cls_name = cls.__name__ + visit_name = "visit_" + REDIRECT.get(cls_name, cls_name).lower() + visit_method = getattr(self, visit_name) + self._visit_meths[cls] = visit_method + return visit_method(node, parent) + + def _save_assignment(self, node, name=None): + """save assignement situation since node.parent is not available yet""" + if self._global_names and node.name in self._global_names[-1]: + node.root().set_local(node.name, node) + else: + node.parent.set_local(node.name, node) + + def visit_arguments(self, node, parent): + """visit an Arguments node by returning a fresh instance of it""" + vararg, kwarg = node.vararg, node.kwarg + if PY34: + newnode = nodes.Arguments( + vararg.arg if vararg else None, kwarg.arg if kwarg else None, parent + ) + else: + newnode = nodes.Arguments(vararg, kwarg, parent) + args = [self.visit(child, newnode) for child in node.args] + defaults = [self.visit(child, newnode) for child in node.defaults] + varargannotation = None + kwargannotation = None + # change added in 82732 (7c5c678e4164), vararg and kwarg + # are instances of `_ast.arg`, not strings + if vararg: + if PY34: + if node.vararg.annotation: + varargannotation = self.visit(node.vararg.annotation, newnode) + vararg = vararg.arg + if kwarg: + if PY34: + if node.kwarg.annotation: + kwargannotation = self.visit(node.kwarg.annotation, newnode) + kwarg = kwarg.arg + if PY3: + kwonlyargs = [self.visit(child, newnode) for child in node.kwonlyargs] + kw_defaults = [ + self.visit(child, newnode) if child else None + for child in node.kw_defaults + ] + annotations = [ + self.visit(arg.annotation, newnode) if arg.annotation else None + for arg in node.args + ] + kwonlyargs_annotations = [ + self.visit(arg.annotation, newnode) if arg.annotation else None + for arg in node.kwonlyargs + ] + else: + kwonlyargs = [] + kw_defaults = [] + annotations = [] + kwonlyargs_annotations = [] + + newnode.postinit( + args=args, + defaults=defaults, + kwonlyargs=kwonlyargs, + kw_defaults=kw_defaults, + annotations=annotations, + kwonlyargs_annotations=kwonlyargs_annotations, + varargannotation=varargannotation, + kwargannotation=kwargannotation, + ) + # save argument names in locals: + if vararg: + newnode.parent.set_local(vararg, newnode) + if kwarg: + newnode.parent.set_local(kwarg, newnode) + return newnode + + def visit_assert(self, node, parent): + """visit a Assert node by returning a fresh instance of it""" + newnode = nodes.Assert(node.lineno, node.col_offset, parent) + if node.msg: + msg = self.visit(node.msg, newnode) + else: + msg = None + newnode.postinit(self.visit(node.test, newnode), msg) + return newnode + + def check_type_comment(self, node): + type_comment = getattr(node, "type_comment", None) + if not type_comment: + return None + + try: + type_comment_ast = _parse(type_comment) + except SyntaxError: + # Invalid type comment, just skip it. + return None + + type_object = self.visit(type_comment_ast.body[0], node) + if not isinstance(type_object, nodes.Expr): + return None + + return type_object.value + + def check_function_type_comment(self, node): + type_comment = getattr(node, "type_comment", None) + if not type_comment: + return None + + try: + type_comment_ast = parse_function_type_comment(type_comment) + except SyntaxError: + # Invalid type comment, just skip it. + return None + + returns = None + argtypes = [ + self.visit(elem, node) for elem in (type_comment_ast.argtypes or []) + ] + if type_comment_ast.returns: + returns = self.visit(type_comment_ast.returns, node) + + return returns, argtypes + + def visit_assign(self, node, parent): + """visit a Assign node by returning a fresh instance of it""" + type_annotation = self.check_type_comment(node) + newnode = nodes.Assign(node.lineno, node.col_offset, parent) + newnode.postinit( + targets=[self.visit(child, newnode) for child in node.targets], + value=self.visit(node.value, newnode), + type_annotation=type_annotation, + ) + return newnode + + def visit_assignname(self, node, parent, node_name=None): + """visit a node and return a AssignName node""" + newnode = nodes.AssignName( + node_name, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + self._save_assignment(newnode) + return newnode + + def visit_augassign(self, node, parent): + """visit a AugAssign node by returning a fresh instance of it""" + newnode = nodes.AugAssign( + self._bin_op_classes[type(node.op)] + "=", + node.lineno, + node.col_offset, + parent, + ) + newnode.postinit( + self.visit(node.target, newnode), self.visit(node.value, newnode) + ) + return newnode + + def visit_repr(self, node, parent): + """visit a Backquote node by returning a fresh instance of it""" + newnode = nodes.Repr(node.lineno, node.col_offset, parent) + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + def visit_binop(self, node, parent): + """visit a BinOp node by returning a fresh instance of it""" + newnode = nodes.BinOp( + self._bin_op_classes[type(node.op)], node.lineno, node.col_offset, parent + ) + newnode.postinit( + self.visit(node.left, newnode), self.visit(node.right, newnode) + ) + return newnode + + def visit_boolop(self, node, parent): + """visit a BoolOp node by returning a fresh instance of it""" + newnode = nodes.BoolOp( + self._bool_op_classes[type(node.op)], node.lineno, node.col_offset, parent + ) + newnode.postinit([self.visit(child, newnode) for child in node.values]) + return newnode + + def visit_break(self, node, parent): + """visit a Break node by returning a fresh instance of it""" + return nodes.Break( + getattr(node, "lineno", None), getattr(node, "col_offset", None), parent + ) + + def visit_call(self, node, parent): + """visit a CallFunc node by returning a fresh instance of it""" + newnode = nodes.Call(node.lineno, node.col_offset, parent) + starargs = _visit_or_none(node, "starargs", self, newnode) + kwargs = _visit_or_none(node, "kwargs", self, newnode) + args = [self.visit(child, newnode) for child in node.args] + + if node.keywords: + keywords = [self.visit(child, newnode) for child in node.keywords] + else: + keywords = None + if starargs: + new_starargs = nodes.Starred( + col_offset=starargs.col_offset, + lineno=starargs.lineno, + parent=starargs.parent, + ) + new_starargs.postinit(value=starargs) + args.append(new_starargs) + if kwargs: + new_kwargs = nodes.Keyword( + arg=None, + col_offset=kwargs.col_offset, + lineno=kwargs.lineno, + parent=kwargs.parent, + ) + new_kwargs.postinit(value=kwargs) + if keywords: + keywords.append(new_kwargs) + else: + keywords = [new_kwargs] + + newnode.postinit(self.visit(node.func, newnode), args, keywords) + return newnode + + def visit_classdef(self, node, parent, newstyle=None): + """visit a ClassDef node to become astroid""" + node, doc = self._get_doc(node) + newnode = nodes.ClassDef(node.name, doc, node.lineno, node.col_offset, parent) + metaclass = None + if PY3: + for keyword in node.keywords: + if keyword.arg == "metaclass": + metaclass = self.visit(keyword, newnode).value + break + if node.decorator_list: + decorators = self.visit_decorators(node, newnode) + else: + decorators = None + newnode.postinit( + [self.visit(child, newnode) for child in node.bases], + [self.visit(child, newnode) for child in node.body], + decorators, + newstyle, + metaclass, + [ + self.visit(kwd, newnode) + for kwd in node.keywords + if kwd.arg != "metaclass" + ] + if PY3 + else [], + ) + return newnode + + def visit_const(self, node, parent): + """visit a Const node by returning a fresh instance of it""" + return nodes.Const( + node.value, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + + def visit_continue(self, node, parent): + """visit a Continue node by returning a fresh instance of it""" + return nodes.Continue( + getattr(node, "lineno", None), getattr(node, "col_offset", None), parent + ) + + def visit_compare(self, node, parent): + """visit a Compare node by returning a fresh instance of it""" + newnode = nodes.Compare(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.left, newnode), + [ + (self._cmp_op_classes[op.__class__], self.visit(expr, newnode)) + for (op, expr) in zip(node.ops, node.comparators) + ], + ) + return newnode + + def visit_comprehension(self, node, parent): + """visit a Comprehension node by returning a fresh instance of it""" + newnode = nodes.Comprehension(parent) + newnode.postinit( + self.visit(node.target, newnode), + self.visit(node.iter, newnode), + [self.visit(child, newnode) for child in node.ifs], + getattr(node, "is_async", None), + ) + return newnode + + def visit_decorators(self, node, parent): + """visit a Decorators node by returning a fresh instance of it""" + # /!\ node is actually a _ast.FunctionDef node while + # parent is an astroid.nodes.FunctionDef node + newnode = nodes.Decorators(node.lineno, node.col_offset, parent) + newnode.postinit([self.visit(child, newnode) for child in node.decorator_list]) + return newnode + + def visit_delete(self, node, parent): + """visit a Delete node by returning a fresh instance of it""" + newnode = nodes.Delete(node.lineno, node.col_offset, parent) + newnode.postinit([self.visit(child, newnode) for child in node.targets]) + return newnode + + def _visit_dict_items(self, node, parent, newnode): + for key, value in zip(node.keys, node.values): + rebuilt_value = self.visit(value, newnode) + if not key: + # Python 3.5 and extended unpacking + rebuilt_key = nodes.DictUnpack( + rebuilt_value.lineno, rebuilt_value.col_offset, parent + ) + else: + rebuilt_key = self.visit(key, newnode) + yield rebuilt_key, rebuilt_value + + def visit_dict(self, node, parent): + """visit a Dict node by returning a fresh instance of it""" + newnode = nodes.Dict(node.lineno, node.col_offset, parent) + items = list(self._visit_dict_items(node, parent, newnode)) + newnode.postinit(items) + return newnode + + def visit_dictcomp(self, node, parent): + """visit a DictComp node by returning a fresh instance of it""" + newnode = nodes.DictComp(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.key, newnode), + self.visit(node.value, newnode), + [self.visit(child, newnode) for child in node.generators], + ) + return newnode + + def visit_expr(self, node, parent): + """visit a Expr node by returning a fresh instance of it""" + newnode = nodes.Expr(node.lineno, node.col_offset, parent) + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + # Not used in Python 3.8+. + def visit_ellipsis(self, node, parent): + """visit an Ellipsis node by returning a fresh instance of it""" + return nodes.Ellipsis( + getattr(node, "lineno", None), getattr(node, "col_offset", None), parent + ) + + def visit_emptynode(self, node, parent): + """visit an EmptyNode node by returning a fresh instance of it""" + return nodes.EmptyNode( + getattr(node, "lineno", None), getattr(node, "col_offset", None), parent + ) + + def visit_excepthandler(self, node, parent): + """visit an ExceptHandler node by returning a fresh instance of it""" + newnode = nodes.ExceptHandler(node.lineno, node.col_offset, parent) + # /!\ node.name can be a tuple + newnode.postinit( + _visit_or_none(node, "type", self, newnode), + _visit_or_none(node, "name", self, newnode), + [self.visit(child, newnode) for child in node.body], + ) + return newnode + + def visit_exec(self, node, parent): + """visit an Exec node by returning a fresh instance of it""" + newnode = nodes.Exec(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.body, newnode), + _visit_or_none(node, "globals", self, newnode), + _visit_or_none(node, "locals", self, newnode), + ) + return newnode + + # Not used in Python 3.8+. + def visit_extslice(self, node, parent): + """visit an ExtSlice node by returning a fresh instance of it""" + newnode = nodes.ExtSlice(parent=parent) + newnode.postinit([self.visit(dim, newnode) for dim in node.dims]) + return newnode + + def _visit_for(self, cls, node, parent): + """visit a For node by returning a fresh instance of it""" + newnode = cls(node.lineno, node.col_offset, parent) + type_annotation = self.check_type_comment(node) + newnode.postinit( + target=self.visit(node.target, newnode), + iter=self.visit(node.iter, newnode), + body=[self.visit(child, newnode) for child in node.body], + orelse=[self.visit(child, newnode) for child in node.orelse], + type_annotation=type_annotation, + ) + return newnode + + def visit_for(self, node, parent): + return self._visit_for(nodes.For, node, parent) + + def visit_importfrom(self, node, parent): + """visit an ImportFrom node by returning a fresh instance of it""" + names = [(alias.name, alias.asname) for alias in node.names] + newnode = nodes.ImportFrom( + node.module or "", + names, + node.level or None, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + # store From names to add them to locals after building + self._import_from_nodes.append(newnode) + return newnode + + def _visit_functiondef(self, cls, node, parent): + """visit an FunctionDef node to become astroid""" + self._global_names.append({}) + node, doc = self._get_doc(node) + newnode = cls(node.name, doc, node.lineno, node.col_offset, parent) + if node.decorator_list: + decorators = self.visit_decorators(node, newnode) + else: + decorators = None + if PY3 and node.returns: + returns = self.visit(node.returns, newnode) + else: + returns = None + + type_comment_args = type_comment_returns = None + type_comment_annotation = self.check_function_type_comment(node) + if type_comment_annotation: + type_comment_returns, type_comment_args = type_comment_annotation + newnode.postinit( + args=self.visit(node.args, newnode), + body=[self.visit(child, newnode) for child in node.body], + decorators=decorators, + returns=returns, + type_comment_returns=type_comment_returns, + type_comment_args=type_comment_args, + ) + self._global_names.pop() + return newnode + + def visit_functiondef(self, node, parent): + return self._visit_functiondef(nodes.FunctionDef, node, parent) + + def visit_generatorexp(self, node, parent): + """visit a GeneratorExp node by returning a fresh instance of it""" + newnode = nodes.GeneratorExp(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.elt, newnode), + [self.visit(child, newnode) for child in node.generators], + ) + return newnode + + def visit_attribute(self, node, parent): + """visit an Attribute node by returning a fresh instance of it""" + context = self._get_context(node) + if context == astroid.Del: + # FIXME : maybe we should reintroduce and visit_delattr ? + # for instance, deactivating assign_ctx + newnode = nodes.DelAttr(node.attr, node.lineno, node.col_offset, parent) + elif context == astroid.Store: + newnode = nodes.AssignAttr(node.attr, node.lineno, node.col_offset, parent) + # Prohibit a local save if we are in an ExceptHandler. + if not isinstance(parent, astroid.ExceptHandler): + self._delayed_assattr.append(newnode) + else: + newnode = nodes.Attribute(node.attr, node.lineno, node.col_offset, parent) + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + def visit_global(self, node, parent): + """visit a Global node to become astroid""" + newnode = nodes.Global( + node.names, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + if self._global_names: # global at the module level, no effect + for name in node.names: + self._global_names[-1].setdefault(name, []).append(newnode) + return newnode + + def visit_if(self, node, parent): + """visit an If node by returning a fresh instance of it""" + newnode = nodes.If(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.test, newnode), + [self.visit(child, newnode) for child in node.body], + [self.visit(child, newnode) for child in node.orelse], + ) + return newnode + + def visit_ifexp(self, node, parent): + """visit a IfExp node by returning a fresh instance of it""" + newnode = nodes.IfExp(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.test, newnode), + self.visit(node.body, newnode), + self.visit(node.orelse, newnode), + ) + return newnode + + def visit_import(self, node, parent): + """visit a Import node by returning a fresh instance of it""" + names = [(alias.name, alias.asname) for alias in node.names] + newnode = nodes.Import( + names, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + # save import names in parent's locals: + for (name, asname) in newnode.names: + name = asname or name + parent.set_local(name.split(".")[0], newnode) + return newnode + + # Not used in Python 3.8+. + def visit_index(self, node, parent): + """visit a Index node by returning a fresh instance of it""" + newnode = nodes.Index(parent=parent) + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + def visit_keyword(self, node, parent): + """visit a Keyword node by returning a fresh instance of it""" + newnode = nodes.Keyword(node.arg, parent=parent) + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + def visit_lambda(self, node, parent): + """visit a Lambda node by returning a fresh instance of it""" + newnode = nodes.Lambda(node.lineno, node.col_offset, parent) + newnode.postinit(self.visit(node.args, newnode), self.visit(node.body, newnode)) + return newnode + + def visit_list(self, node, parent): + """visit a List node by returning a fresh instance of it""" + context = self._get_context(node) + newnode = nodes.List( + ctx=context, lineno=node.lineno, col_offset=node.col_offset, parent=parent + ) + newnode.postinit([self.visit(child, newnode) for child in node.elts]) + return newnode + + def visit_listcomp(self, node, parent): + """visit a ListComp node by returning a fresh instance of it""" + newnode = nodes.ListComp(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.elt, newnode), + [self.visit(child, newnode) for child in node.generators], + ) + return newnode + + def visit_name(self, node, parent): + """visit a Name node by returning a fresh instance of it""" + context = self._get_context(node) + # True and False can be assigned to something in py2x, so we have to + # check first the context. + if context == astroid.Del: + newnode = nodes.DelName(node.id, node.lineno, node.col_offset, parent) + elif context == astroid.Store: + newnode = nodes.AssignName(node.id, node.lineno, node.col_offset, parent) + elif node.id in CONST_NAME_TRANSFORMS: + newnode = nodes.Const( + CONST_NAME_TRANSFORMS[node.id], + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + return newnode + else: + newnode = nodes.Name(node.id, node.lineno, node.col_offset, parent) + # XXX REMOVE me : + if context in (astroid.Del, astroid.Store): # 'Aug' ?? + self._save_assignment(newnode) + return newnode + + def visit_constant(self, node, parent): + """visit a Constant node by returning a fresh instance of Const""" + return nodes.Const( + node.value, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + + # Not used in Python 3.8+. + def visit_str(self, node, parent): + """visit a String/Bytes node by returning a fresh instance of Const""" + return nodes.Const( + node.s, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + + visit_bytes = visit_str + + # Not used in Python 3.8+. + def visit_num(self, node, parent): + """visit a Num node by returning a fresh instance of Const""" + return nodes.Const( + node.n, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + + def visit_pass(self, node, parent): + """visit a Pass node by returning a fresh instance of it""" + return nodes.Pass(node.lineno, node.col_offset, parent) + + def visit_print(self, node, parent): + """visit a Print node by returning a fresh instance of it""" + newnode = nodes.Print(node.nl, node.lineno, node.col_offset, parent) + newnode.postinit( + _visit_or_none(node, "dest", self, newnode), + [self.visit(child, newnode) for child in node.values], + ) + return newnode + + def visit_raise(self, node, parent): + """visit a Raise node by returning a fresh instance of it""" + newnode = nodes.Raise(node.lineno, node.col_offset, parent) + # pylint: disable=too-many-function-args + newnode.postinit( + _visit_or_none(node, "type", self, newnode), + _visit_or_none(node, "inst", self, newnode), + _visit_or_none(node, "tback", self, newnode), + ) + return newnode + + def visit_return(self, node, parent): + """visit a Return node by returning a fresh instance of it""" + newnode = nodes.Return(node.lineno, node.col_offset, parent) + if node.value is not None: + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + def visit_set(self, node, parent): + """visit a Set node by returning a fresh instance of it""" + newnode = nodes.Set(node.lineno, node.col_offset, parent) + newnode.postinit([self.visit(child, newnode) for child in node.elts]) + return newnode + + def visit_setcomp(self, node, parent): + """visit a SetComp node by returning a fresh instance of it""" + newnode = nodes.SetComp(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.elt, newnode), + [self.visit(child, newnode) for child in node.generators], + ) + return newnode + + def visit_slice(self, node, parent): + """visit a Slice node by returning a fresh instance of it""" + newnode = nodes.Slice(parent=parent) + newnode.postinit( + _visit_or_none(node, "lower", self, newnode), + _visit_or_none(node, "upper", self, newnode), + _visit_or_none(node, "step", self, newnode), + ) + return newnode + + def visit_subscript(self, node, parent): + """visit a Subscript node by returning a fresh instance of it""" + context = self._get_context(node) + newnode = nodes.Subscript( + ctx=context, lineno=node.lineno, col_offset=node.col_offset, parent=parent + ) + newnode.postinit( + self.visit(node.value, newnode), self.visit(node.slice, newnode) + ) + return newnode + + def visit_tryexcept(self, node, parent): + """visit a TryExcept node by returning a fresh instance of it""" + newnode = nodes.TryExcept(node.lineno, node.col_offset, parent) + newnode.postinit( + [self.visit(child, newnode) for child in node.body], + [self.visit(child, newnode) for child in node.handlers], + [self.visit(child, newnode) for child in node.orelse], + ) + return newnode + + def visit_tryfinally(self, node, parent): + """visit a TryFinally node by returning a fresh instance of it""" + newnode = nodes.TryFinally(node.lineno, node.col_offset, parent) + newnode.postinit( + [self.visit(child, newnode) for child in node.body], + [self.visit(n, newnode) for n in node.finalbody], + ) + return newnode + + def visit_tuple(self, node, parent): + """visit a Tuple node by returning a fresh instance of it""" + context = self._get_context(node) + newnode = nodes.Tuple( + ctx=context, lineno=node.lineno, col_offset=node.col_offset, parent=parent + ) + newnode.postinit([self.visit(child, newnode) for child in node.elts]) + return newnode + + def visit_unaryop(self, node, parent): + """visit a UnaryOp node by returning a fresh instance of it""" + newnode = nodes.UnaryOp( + self._unary_op_classes[node.op.__class__], + node.lineno, + node.col_offset, + parent, + ) + newnode.postinit(self.visit(node.operand, newnode)) + return newnode + + def visit_while(self, node, parent): + """visit a While node by returning a fresh instance of it""" + newnode = nodes.While(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.test, newnode), + [self.visit(child, newnode) for child in node.body], + [self.visit(child, newnode) for child in node.orelse], + ) + return newnode + + def visit_with(self, node, parent): + newnode = nodes.With(node.lineno, node.col_offset, parent) + expr = self.visit(node.context_expr, newnode) + if node.optional_vars is not None: + optional_vars = self.visit(node.optional_vars, newnode) + else: + optional_vars = None + + type_annotation = self.check_type_comment(node) + newnode.postinit( + items=[(expr, optional_vars)], + body=[self.visit(child, newnode) for child in node.body], + type_annotation=type_annotation, + ) + return newnode + + def visit_yield(self, node, parent): + """visit a Yield node by returning a fresh instance of it""" + newnode = nodes.Yield(node.lineno, node.col_offset, parent) + if node.value is not None: + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + +class TreeRebuilder3(TreeRebuilder): + """extend and overwrite TreeRebuilder for python3k""" + + def visit_arg(self, node, parent): + """visit an arg node by returning a fresh AssName instance""" + return self.visit_assignname(node, parent, node.arg) + + # Not used in Python 3.8+. + def visit_nameconstant(self, node, parent): + # in Python 3.4 we have NameConstant for True / False / None + return nodes.Const( + node.value, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + + def visit_excepthandler(self, node, parent): + """visit an ExceptHandler node by returning a fresh instance of it""" + newnode = nodes.ExceptHandler(node.lineno, node.col_offset, parent) + if node.name: + name = self.visit_assignname(node, newnode, node.name) + else: + name = None + newnode.postinit( + _visit_or_none(node, "type", self, newnode), + name, + [self.visit(child, newnode) for child in node.body], + ) + return newnode + + def visit_nonlocal(self, node, parent): + """visit a Nonlocal node and return a new instance of it""" + return nodes.Nonlocal( + node.names, + getattr(node, "lineno", None), + getattr(node, "col_offset", None), + parent, + ) + + def visit_raise(self, node, parent): + """visit a Raise node by returning a fresh instance of it""" + newnode = nodes.Raise(node.lineno, node.col_offset, parent) + # no traceback; anyway it is not used in Pylint + newnode.postinit( + _visit_or_none(node, "exc", self, newnode), + _visit_or_none(node, "cause", self, newnode), + ) + return newnode + + def visit_starred(self, node, parent): + """visit a Starred node and return a new instance of it""" + context = self._get_context(node) + newnode = nodes.Starred( + ctx=context, lineno=node.lineno, col_offset=node.col_offset, parent=parent + ) + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + def visit_try(self, node, parent): + # python 3.3 introduce a new Try node replacing + # TryFinally/TryExcept nodes + if node.finalbody: + newnode = nodes.TryFinally(node.lineno, node.col_offset, parent) + if node.handlers: + body = [self.visit_tryexcept(node, newnode)] + else: + body = [self.visit(child, newnode) for child in node.body] + newnode.postinit(body, [self.visit(n, newnode) for n in node.finalbody]) + return newnode + if node.handlers: + return self.visit_tryexcept(node, parent) + return None + + def visit_annassign(self, node, parent): + """visit an AnnAssign node by returning a fresh instance of it""" + newnode = nodes.AnnAssign(node.lineno, node.col_offset, parent) + annotation = _visit_or_none(node, "annotation", self, newnode) + newnode.postinit( + target=self.visit(node.target, newnode), + annotation=annotation, + simple=node.simple, + value=_visit_or_none(node, "value", self, newnode), + ) + return newnode + + def _visit_with(self, cls, node, parent): + if "items" not in node._fields: + # python < 3.3 + return super(TreeRebuilder3, self).visit_with(node, parent) + + newnode = cls(node.lineno, node.col_offset, parent) + + def visit_child(child): + expr = self.visit(child.context_expr, newnode) + var = _visit_or_none(child, "optional_vars", self, newnode) + return expr, var + + type_annotation = self.check_type_comment(node) + newnode.postinit( + items=[visit_child(child) for child in node.items], + body=[self.visit(child, newnode) for child in node.body], + type_annotation=type_annotation, + ) + return newnode + + def visit_with(self, node, parent): + return self._visit_with(nodes.With, node, parent) + + def visit_yieldfrom(self, node, parent): + newnode = nodes.YieldFrom(node.lineno, node.col_offset, parent) + if node.value is not None: + newnode.postinit(self.visit(node.value, newnode)) + return newnode + + def visit_classdef(self, node, parent, newstyle=True): + return super(TreeRebuilder3, self).visit_classdef( + node, parent, newstyle=newstyle + ) + + # Async structs added in Python 3.5 + def visit_asyncfunctiondef(self, node, parent): + return self._visit_functiondef(nodes.AsyncFunctionDef, node, parent) + + def visit_asyncfor(self, node, parent): + return self._visit_for(nodes.AsyncFor, node, parent) + + def visit_await(self, node, parent): + newnode = nodes.Await(node.lineno, node.col_offset, parent) + newnode.postinit(value=self.visit(node.value, newnode)) + return newnode + + def visit_asyncwith(self, node, parent): + return self._visit_with(nodes.AsyncWith, node, parent) + + def visit_joinedstr(self, node, parent): + newnode = nodes.JoinedStr(node.lineno, node.col_offset, parent) + newnode.postinit([self.visit(child, newnode) for child in node.values]) + return newnode + + def visit_formattedvalue(self, node, parent): + newnode = nodes.FormattedValue(node.lineno, node.col_offset, parent) + newnode.postinit( + self.visit(node.value, newnode), + node.conversion, + _visit_or_none(node, "format_spec", self, newnode), + ) + return newnode + + +if sys.version_info >= (3, 0): + TreeRebuilder = TreeRebuilder3 diff --git a/venv/lib/python3.7/site-packages/astroid/scoped_nodes.py b/venv/lib/python3.7/site-packages/astroid/scoped_nodes.py new file mode 100644 index 0000000..b94fbe4 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/scoped_nodes.py @@ -0,0 +1,2798 @@ +# -*- coding: utf-8 -*- +# Copyright (c) 2006-2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2010 Daniel Harding +# Copyright (c) 2011, 2013-2015 Google, Inc. +# Copyright (c) 2013-2018 Claudiu Popa +# Copyright (c) 2013 Phil Schaf +# Copyright (c) 2014 Eevee (Alex Munroe) +# Copyright (c) 2015-2016 Florian Bruhin +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2015 Rene Zhang +# Copyright (c) 2015 Philip Lorenz +# Copyright (c) 2016-2017 Derek Gustafson +# Copyright (c) 2017-2018 Bryce Guinta +# Copyright (c) 2017-2018 Ashley Whetter +# Copyright (c) 2017 Łukasz Rogalski +# Copyright (c) 2017 David Euresti +# Copyright (c) 2018 Nick Drozd +# Copyright (c) 2018 Anthony Sottile +# Copyright (c) 2018 HoverHell + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +""" +This module contains the classes for "scoped" node, i.e. which are opening a +new local scope in the language definition : Module, ClassDef, FunctionDef (and +Lambda, GeneratorExp, DictComp and SetComp to some extent). +""" + +import builtins +import sys +import io +import itertools +from typing import Optional, List + +from astroid import bases +from astroid import context as contextmod +from astroid import exceptions +from astroid import decorators as decorators_mod +from astroid.interpreter import objectmodel +from astroid.interpreter import dunder_lookup +from astroid import manager +from astroid import mixins +from astroid import node_classes +from astroid import util + + +BUILTINS = builtins.__name__ +ITER_METHODS = ("__iter__", "__getitem__") + + +def _c3_merge(sequences, cls, context): + """Merges MROs in *sequences* to a single MRO using the C3 algorithm. + + Adapted from http://www.python.org/download/releases/2.3/mro/. + + """ + result = [] + while True: + sequences = [s for s in sequences if s] # purge empty sequences + if not sequences: + return result + for s1 in sequences: # find merge candidates among seq heads + candidate = s1[0] + for s2 in sequences: + if candidate in s2[1:]: + candidate = None + break # reject the current head, it appears later + else: + break + if not candidate: + # Show all the remaining bases, which were considered as + # candidates for the next mro sequence. + raise exceptions.InconsistentMroError( + message="Cannot create a consistent method resolution order " + "for MROs {mros} of class {cls!r}.", + mros=sequences, + cls=cls, + context=context, + ) + + result.append(candidate) + # remove the chosen candidate + for seq in sequences: + if seq[0] == candidate: + del seq[0] + return None + + +def _verify_duplicates_mro(sequences, cls, context): + for sequence in sequences: + names = [(node.lineno, node.qname()) for node in sequence if node.name] + if len(names) != len(set(names)): + raise exceptions.DuplicateBasesError( + message="Duplicates found in MROs {mros} for {cls!r}.", + mros=sequences, + cls=cls, + context=context, + ) + + +def function_to_method(n, klass): + if isinstance(n, FunctionDef): + if n.type == "classmethod": + return bases.BoundMethod(n, klass) + if n.type != "staticmethod": + return bases.UnboundMethod(n) + return n + + +MANAGER = manager.AstroidManager() + + +def builtin_lookup(name): + """lookup a name into the builtin module + return the list of matching statements and the astroid for the builtin + module + """ + builtin_astroid = MANAGER.ast_from_module(builtins) + if name == "__dict__": + return builtin_astroid, () + try: + stmts = builtin_astroid.locals[name] + except KeyError: + stmts = () + return builtin_astroid, stmts + + +# TODO move this Mixin to mixins.py; problem: 'FunctionDef' in _scope_lookup +class LocalsDictNodeNG(node_classes.LookupMixIn, node_classes.NodeNG): + """ this class provides locals handling common to Module, FunctionDef + and ClassDef nodes, including a dict like interface for direct access + to locals information + """ + + # attributes below are set by the builder module or by raw factories + + locals = {} + """A map of the name of a local variable to the node defining the local. + + :type: dict(str, NodeNG) + """ + + def qname(self): + """Get the 'qualified' name of the node. + + For example: module.name, module.class.name ... + + :returns: The qualified name. + :rtype: str + """ + # pylint: disable=no-member; github.com/pycqa/astroid/issues/278 + if self.parent is None: + return self.name + return "%s.%s" % (self.parent.frame().qname(), self.name) + + def frame(self): + """The first parent frame node. + + A frame node is a :class:`Module`, :class:`FunctionDef`, + or :class:`ClassDef`. + + :returns: The first parent frame node. + :rtype: Module or FunctionDef or ClassDef + """ + return self + + def scope(self): + """The first parent node defining a new scope. + + :returns: The first parent scope node. + :rtype: Module or FunctionDef or ClassDef or Lambda or GenExpr + """ + return self + + def _scope_lookup(self, node, name, offset=0): + """XXX method for interfacing the scope lookup""" + try: + stmts = node._filter_stmts(self.locals[name], self, offset) + except KeyError: + stmts = () + if stmts: + return self, stmts + if self.parent: # i.e. not Module + # nested scope: if parent scope is a function, that's fine + # else jump to the module + pscope = self.parent.scope() + if not pscope.is_function: + pscope = pscope.root() + return pscope.scope_lookup(node, name) + return builtin_lookup(name) # Module + + def set_local(self, name, stmt): + """Define that the given name is declared in the given statement node. + + .. seealso:: :meth:`scope` + + :param name: The name that is being defined. + :type name: str + + :param stmt: The statement that defines the given name. + :type stmt: NodeNG + """ + # assert not stmt in self.locals.get(name, ()), (self, stmt) + self.locals.setdefault(name, []).append(stmt) + + __setitem__ = set_local + + def _append_node(self, child): + """append a child, linking it in the tree""" + # pylint: disable=no-member; depending by the class + # which uses the current class as a mixin or base class. + # It's rewritten in 2.0, so it makes no sense for now + # to spend development time on it. + self.body.append(child) + child.parent = self + + def add_local_node(self, child_node, name=None): + """Append a child that should alter the locals of this scope node. + + :param child_node: The child node that will alter locals. + :type child_node: NodeNG + + :param name: The name of the local that will be altered by + the given child node. + :type name: str or None + """ + if name != "__class__": + # add __class__ node as a child will cause infinite recursion later! + self._append_node(child_node) + self.set_local(name or child_node.name, child_node) + + def __getitem__(self, item): + """The first node the defines the given local. + + :param item: The name of the locally defined object. + :type item: str + + :raises KeyError: If the name is not defined. + """ + return self.locals[item][0] + + def __iter__(self): + """Iterate over the names of locals defined in this scoped node. + + :returns: The names of the defined locals. + :rtype: iterable(str) + """ + return iter(self.keys()) + + def keys(self): + """The names of locals defined in this scoped node. + + :returns: The names of the defined locals. + :rtype: list(str) + """ + return list(self.locals.keys()) + + def values(self): + """The nodes that define the locals in this scoped node. + + :returns: The nodes that define locals. + :rtype: list(NodeNG) + """ + return [self[key] for key in self.keys()] + + def items(self): + """Get the names of the locals and the node that defines the local. + + :returns: The names of locals and their associated node. + :rtype: list(tuple(str, NodeNG)) + """ + return list(zip(self.keys(), self.values())) + + def __contains__(self, name): + """Check if a local is defined in this scope. + + :param name: The name of the local to check for. + :type name: str + + :returns: True if this node has a local of the given name, + False otherwise. + :rtype: bool + """ + return name in self.locals + + +class Module(LocalsDictNodeNG): + """Class representing an :class:`ast.Module` node. + + >>> node = astroid.extract_node('import astroid') + >>> node + + >>> node.parent + + """ + + _astroid_fields = ("body",) + + fromlineno = 0 + """The first line that this node appears on in the source code. + + :type: int or None + """ + lineno = 0 + """The line that this node appears on in the source code. + + :type: int or None + """ + + # attributes below are set by the builder module or by raw factories + + file = None + """The path to the file that this ast has been extracted from. + + This will be ``None`` when the representation has been built from a + built-in module. + + :type: str or None + """ + file_bytes = None + """The string/bytes that this ast was built from. + + :type: str or bytes or None + """ + file_encoding = None + """The encoding of the source file. + + This is used to get unicode out of a source file. + Python 2 only. + + :type: str or None + """ + name = None + """The name of the module. + + :type: str or None + """ + pure_python = None + """Whether the ast was built from source. + + :type: bool or None + """ + package = None + """Whether the node represents a package or a module. + + :type: bool or None + """ + globals = None + """A map of the name of a global variable to the node defining the global. + + :type: dict(str, NodeNG) + """ + + # Future imports + future_imports = None + """The imports from ``__future__``. + + :type: set(str) or None + """ + special_attributes = objectmodel.ModuleModel() + """The names of special attributes that this module has. + + :type: objectmodel.ModuleModel + """ + + # names of module attributes available through the global scope + scope_attrs = {"__name__", "__doc__", "__file__", "__path__", "__package__"} + """The names of module attributes available through the global scope. + + :type: str(str) + """ + + _other_fields = ( + "name", + "doc", + "file", + "path", + "package", + "pure_python", + "future_imports", + ) + _other_other_fields = ("locals", "globals") + + def __init__( + self, + name, + doc, + file=None, + path: Optional[List[str]] = None, + package=None, + parent=None, + pure_python=True, + ): + """ + :param name: The name of the module. + :type name: str + + :param doc: The module docstring. + :type doc: str + + :param file: The path to the file that this ast has been extracted from. + :type file: str or None + + :param path: + :type path: Optional[List[str]] + + :param package: Whether the node represents a package or a module. + :type package: bool or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + + :param pure_python: Whether the ast was built from source. + :type pure_python: bool or None + """ + self.name = name + self.doc = doc + self.file = file + self.path = path + self.package = package + self.parent = parent + self.pure_python = pure_python + self.locals = self.globals = {} + """A map of the name of a local variable to the node defining the local. + + :type: dict(str, NodeNG) + """ + self.body = [] + """The contents of the module. + + :type: list(NodeNG) or None + """ + self.future_imports = set() + + # pylint: enable=redefined-builtin + + def postinit(self, body=None): + """Do some setup after initialisation. + + :param body: The contents of the module. + :type body: list(NodeNG) or None + """ + self.body = body + + def _get_stream(self): + if self.file_bytes is not None: + return io.BytesIO(self.file_bytes) + if self.file is not None: + stream = open(self.file, "rb") + return stream + return None + + def stream(self): + """Get a stream to the underlying file or bytes. + + :type: file or io.BytesIO or None + """ + return self._get_stream() + + def block_range(self, lineno): + """Get a range from where this node starts to where this node ends. + + :param lineno: Unused. + :type lineno: int + + :returns: The range of line numbers that this node belongs to. + :rtype: tuple(int, int) + """ + return self.fromlineno, self.tolineno + + def scope_lookup(self, node, name, offset=0): + """Lookup where the given variable is assigned. + + :param node: The node to look for assignments up to. + Any assignments after the given node are ignored. + :type node: NodeNG + + :param name: The name of the variable to find assignments for. + :type name: str + + :param offset: The line offset to filter statements up to. + :type offset: int + + :returns: This scope node and the list of assignments associated to the + given name according to the scope where it has been found (locals, + globals or builtin). + :rtype: tuple(str, list(NodeNG)) + """ + if name in self.scope_attrs and name not in self.locals: + try: + return self, self.getattr(name) + except exceptions.AttributeInferenceError: + return self, () + return self._scope_lookup(node, name, offset) + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + return "%s.module" % BUILTINS + + def display_type(self): + """A human readable type of this node. + + :returns: The type of this node. + :rtype: str + """ + return "Module" + + def getattr(self, name, context=None, ignore_locals=False): + result = [] + name_in_locals = name in self.locals + + if name in self.special_attributes and not ignore_locals and not name_in_locals: + result = [self.special_attributes.lookup(name)] + elif not ignore_locals and name_in_locals: + result = self.locals[name] + elif self.package: + try: + result = [self.import_module(name, relative_only=True)] + except (exceptions.AstroidBuildingError, SyntaxError) as exc: + raise exceptions.AttributeInferenceError( + target=self, attribute=name, context=context + ) from exc + result = [n for n in result if not isinstance(n, node_classes.DelName)] + if result: + return result + raise exceptions.AttributeInferenceError( + target=self, attribute=name, context=context + ) + + def igetattr(self, name, context=None): + """Infer the possible values of the given variable. + + :param name: The name of the variable to infer. + :type name: str + + :returns: The inferred possible values. + :rtype: iterable(NodeNG) or None + """ + # set lookup name since this is necessary to infer on import nodes for + # instance + context = contextmod.copy_context(context) + context.lookupname = name + try: + return bases._infer_stmts(self.getattr(name, context), context, frame=self) + except exceptions.AttributeInferenceError as error: + raise exceptions.InferenceError( + error.message, target=self, attribute=name, context=context + ) from error + + def fully_defined(self): + """Check if this module has been build from a .py file. + + If so, the module contains a complete representation, + including the code. + + :returns: True if the module has been built from a .py file. + :rtype: bool + """ + return self.file is not None and self.file.endswith(".py") + + def statement(self): + """The first parent node, including self, marked as statement node. + + :returns: The first parent statement. + :rtype: NodeNG + """ + return self + + def previous_sibling(self): + """The previous sibling statement. + + :returns: The previous sibling statement node. + :rtype: NodeNG or None + """ + + def next_sibling(self): + """The next sibling statement node. + + :returns: The next sibling statement node. + :rtype: NodeNG or None + """ + + _absolute_import_activated = True + + def absolute_import_activated(self): + """Whether :pep:`328` absolute import behaviour has been enabled. + + :returns: True if :pep:`328` has been enabled, False otherwise. + :rtype: bool + """ + return self._absolute_import_activated + + def import_module(self, modname, relative_only=False, level=None): + """Get the ast for a given module as if imported from this module. + + :param modname: The name of the module to "import". + :type modname: str + + :param relative_only: Whether to only consider relative imports. + :type relative_only: bool + + :param level: The level of relative import. + :type level: int or None + + :returns: The imported module ast. + :rtype: NodeNG + """ + if relative_only and level is None: + level = 0 + absmodname = self.relative_to_absolute_name(modname, level) + + try: + return MANAGER.ast_from_module_name(absmodname) + except exceptions.AstroidBuildingError: + # we only want to import a sub module or package of this module, + # skip here + if relative_only: + raise + return MANAGER.ast_from_module_name(modname) + + def relative_to_absolute_name(self, modname, level): + """Get the absolute module name for a relative import. + + The relative import can be implicit or explicit. + + :param modname: The module name to convert. + :type modname: str + + :param level: The level of relative import. + :type level: int + + :returns: The absolute module name. + :rtype: str + + :raises TooManyLevelsError: When the relative import refers to a + module too far above this one. + """ + # XXX this returns non sens when called on an absolute import + # like 'pylint.checkers.astroid.utils' + # XXX doesn't return absolute name if self.name isn't absolute name + if self.absolute_import_activated() and level is None: + return modname + if level: + if self.package: + level = level - 1 + if level and self.name.count(".") < level: + raise exceptions.TooManyLevelsError(level=level, name=self.name) + + package_name = self.name.rsplit(".", level)[0] + elif self.package: + package_name = self.name + else: + package_name = self.name.rsplit(".", 1)[0] + + if package_name: + if not modname: + return package_name + return "%s.%s" % (package_name, modname) + return modname + + def wildcard_import_names(self): + """The list of imported names when this module is 'wildcard imported'. + + It doesn't include the '__builtins__' name which is added by the + current CPython implementation of wildcard imports. + + :returns: The list of imported names. + :rtype: list(str) + """ + # We separate the different steps of lookup in try/excepts + # to avoid catching too many Exceptions + default = [name for name in self.keys() if not name.startswith("_")] + try: + all_values = self["__all__"] + except KeyError: + return default + + try: + explicit = next(all_values.assigned_stmts()) + except exceptions.InferenceError: + return default + except AttributeError: + # not an assignment node + # XXX infer? + return default + + # Try our best to detect the exported name. + inferred = [] + try: + explicit = next(explicit.infer()) + except exceptions.InferenceError: + return default + if not isinstance(explicit, (node_classes.Tuple, node_classes.List)): + return default + + str_const = lambda node: ( + isinstance(node, node_classes.Const) and isinstance(node.value, str) + ) + for node in explicit.elts: + if str_const(node): + inferred.append(node.value) + else: + try: + inferred_node = next(node.infer()) + except exceptions.InferenceError: + continue + if str_const(inferred_node): + inferred.append(inferred_node.value) + return inferred + + def public_names(self): + """The list of the names that are publicly available in this module. + + :returns: The list of publc names. + :rtype: list(str) + """ + return [name for name in self.keys() if not name.startswith("_")] + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`Module` this is always ``True``. + :rtype: bool + """ + return True + + def get_children(self): + yield from self.body + + +class ComprehensionScope(LocalsDictNodeNG): + """Scoping for different types of comprehensions.""" + + def frame(self): + """The first parent frame node. + + A frame node is a :class:`Module`, :class:`FunctionDef`, + or :class:`ClassDef`. + + :returns: The first parent frame node. + :rtype: Module or FunctionDef or ClassDef + """ + return self.parent.frame() + + scope_lookup = LocalsDictNodeNG._scope_lookup + + +class GeneratorExp(ComprehensionScope): + """Class representing an :class:`ast.GeneratorExp` node. + + >>> node = astroid.extract_node('(thing for thing in things if thing)') + >>> node + + """ + + _astroid_fields = ("elt", "generators") + _other_other_fields = ("locals",) + elt = None + """The element that forms the output of the expression. + + :type: NodeNG or None + """ + generators = None + """The generators that are looped through. + + :type: list(Comprehension) or None + """ + + def __init__(self, lineno=None, col_offset=None, parent=None): + """ + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.locals = {} + """A map of the name of a local variable to the node defining the local. + + :type: dict(str, NodeNG) + """ + + super(GeneratorExp, self).__init__(lineno, col_offset, parent) + + def postinit(self, elt=None, generators=None): + """Do some setup after initialisation. + + :param elt: The element that forms the output of the expression. + :type elt: NodeNG or None + + :param generators: The generators that are looped through. + :type generators: list(Comprehension) or None + """ + self.elt = elt + if generators is None: + self.generators = [] + else: + self.generators = generators + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`GeneratorExp` this is always ``True``. + :rtype: bool + """ + return True + + def get_children(self): + yield self.elt + + yield from self.generators + + +class DictComp(ComprehensionScope): + """Class representing an :class:`ast.DictComp` node. + + >>> node = astroid.extract_node('{k:v for k, v in things if k > v}') + >>> node + + """ + + _astroid_fields = ("key", "value", "generators") + _other_other_fields = ("locals",) + key = None + """What produces the keys. + + :type: NodeNG or None + """ + value = None + """What produces the values. + + :type: NodeNG or None + """ + generators = None + """The generators that are looped through. + + :type: list(Comprehension) or None + """ + + def __init__(self, lineno=None, col_offset=None, parent=None): + """ + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.locals = {} + """A map of the name of a local variable to the node defining the local. + + :type: dict(str, NodeNG) + """ + + super(DictComp, self).__init__(lineno, col_offset, parent) + + def postinit(self, key=None, value=None, generators=None): + """Do some setup after initialisation. + + :param key: What produces the keys. + :type key: NodeNG or None + + :param value: What produces the values. + :type value: NodeNG or None + + :param generators: The generators that are looped through. + :type generators: list(Comprehension) or None + """ + self.key = key + self.value = value + if generators is None: + self.generators = [] + else: + self.generators = generators + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`DictComp` this is always :class:`Uninferable`. + :rtype: Uninferable + """ + return util.Uninferable + + def get_children(self): + yield self.key + yield self.value + + yield from self.generators + + +class SetComp(ComprehensionScope): + """Class representing an :class:`ast.SetComp` node. + + >>> node = astroid.extract_node('{thing for thing in things if thing}') + >>> node + + """ + + _astroid_fields = ("elt", "generators") + _other_other_fields = ("locals",) + elt = None + """The element that forms the output of the expression. + + :type: NodeNG or None + """ + generators = None + """The generators that are looped through. + + :type: list(Comprehension) or None + """ + + def __init__(self, lineno=None, col_offset=None, parent=None): + """ + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.locals = {} + """A map of the name of a local variable to the node defining the local. + + :type: dict(str, NodeNG) + """ + + super(SetComp, self).__init__(lineno, col_offset, parent) + + def postinit(self, elt=None, generators=None): + """Do some setup after initialisation. + + :param elt: The element that forms the output of the expression. + :type elt: NodeNG or None + + :param generators: The generators that are looped through. + :type generators: list(Comprehension) or None + """ + self.elt = elt + if generators is None: + self.generators = [] + else: + self.generators = generators + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`SetComp` this is always :class:`Uninferable`. + :rtype: Uninferable + """ + return util.Uninferable + + def get_children(self): + yield self.elt + + yield from self.generators + + +class _ListComp(node_classes.NodeNG): + """Class representing an :class:`ast.ListComp` node. + + >>> node = astroid.extract_node('[thing for thing in things if thing]') + >>> node + + """ + + _astroid_fields = ("elt", "generators") + elt = None + """The element that forms the output of the expression. + + :type: NodeNG or None + """ + generators = None + """The generators that are looped through. + + :type: list(Comprehension) or None + """ + + def postinit(self, elt=None, generators=None): + """Do some setup after initialisation. + + :param elt: The element that forms the output of the expression. + :type elt: NodeNG or None + + :param generators: The generators that are looped through. + :type generators: list(Comprehension) or None + """ + self.elt = elt + self.generators = generators + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`ListComp` this is always :class:`Uninferable`. + :rtype: Uninferable + """ + return util.Uninferable + + def get_children(self): + yield self.elt + + yield from self.generators + + +class ListComp(_ListComp, ComprehensionScope): + """Class representing an :class:`ast.ListComp` node. + + >>> node = astroid.extract_node('[thing for thing in things if thing]') + >>> node + + """ + + _other_other_fields = ("locals",) + + def __init__(self, lineno=None, col_offset=None, parent=None): + self.locals = {} + """A map of the name of a local variable to the node defining it. + + :type: dict(str, NodeNG) + """ + + super(ListComp, self).__init__(lineno, col_offset, parent) + + +def _infer_decorator_callchain(node): + """Detect decorator call chaining and see if the end result is a + static or a classmethod. + """ + if not isinstance(node, FunctionDef): + return None + if not node.parent: + return None + try: + result = next(node.infer_call_result(node.parent)) + except exceptions.InferenceError: + return None + if isinstance(result, bases.Instance): + result = result._proxied + if isinstance(result, ClassDef): + if result.is_subtype_of("%s.classmethod" % BUILTINS): + return "classmethod" + if result.is_subtype_of("%s.staticmethod" % BUILTINS): + return "staticmethod" + return None + + +class Lambda(mixins.FilterStmtsMixin, LocalsDictNodeNG): + """Class representing an :class:`ast.Lambda` node. + + >>> node = astroid.extract_node('lambda arg: arg + 1') + >>> node + l.1 at 0x7f23b2e41518> + """ + + _astroid_fields = ("args", "body") + _other_other_fields = ("locals",) + name = "" + is_lambda = True + + def implicit_parameters(self): + return 0 + + # function's type, 'function' | 'method' | 'staticmethod' | 'classmethod' + @property + def type(self): + """Whether this is a method or function. + + :returns: 'method' if this is a method, 'function' otherwise. + :rtype: str + """ + # pylint: disable=no-member + if self.args.args and self.args.args[0].name == "self": + if isinstance(self.parent.scope(), ClassDef): + return "method" + return "function" + + def __init__(self, lineno=None, col_offset=None, parent=None): + """ + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.locals = {} + """A map of the name of a local variable to the node defining it. + + :type: dict(str, NodeNG) + """ + + self.args = [] + """The arguments that the function takes. + + :type: Arguments or list + """ + + self.body = [] + """The contents of the function body. + + :type: list(NodeNG) + """ + + super(Lambda, self).__init__(lineno, col_offset, parent) + + def postinit(self, args, body): + """Do some setup after initialisation. + + :param args: The arguments that the function takes. + :type args: Arguments + + :param body: The contents of the function body. + :type body: list(NodeNG) + """ + self.args = args + self.body = body + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + if "method" in self.type: + return "%s.instancemethod" % BUILTINS + return "%s.function" % BUILTINS + + def display_type(self): + """A human readable type of this node. + + :returns: The type of this node. + :rtype: str + """ + if "method" in self.type: + return "Method" + return "Function" + + def callable(self): + """Whether this node defines something that is callable. + + :returns: True if this defines something that is callable, + False otherwise. + For a :class:`Lambda` this is always ``True``. + :rtype: bool + """ + return True + + def argnames(self): + """Get the names of each of the arguments. + + :returns: The names of the arguments. + :rtype: list(str) + """ + # pylint: disable=no-member; github.com/pycqa/astroid/issues/291 + # args is in fact redefined later on by postinit. Can't be changed + # to None due to a strong interaction between Lambda and FunctionDef. + + if self.args.args: # maybe None with builtin functions + names = _rec_get_names(self.args.args) + else: + names = [] + if self.args.vararg: + names.append(self.args.vararg) + if self.args.kwarg: + names.append(self.args.kwarg) + return names + + def infer_call_result(self, caller, context=None): + """Infer what the function returns when called. + + :param caller: Unused + :type caller: object + """ + # pylint: disable=no-member; github.com/pycqa/astroid/issues/291 + # args is in fact redefined later on by postinit. Can't be changed + # to None due to a strong interaction between Lambda and FunctionDef. + return self.body.infer(context) + + def scope_lookup(self, node, name, offset=0): + """Lookup where the given names is assigned. + + :param node: The node to look for assignments up to. + Any assignments after the given node are ignored. + :type node: NodeNG + + :param name: The name to find assignments for. + :type name: str + + :param offset: The line offset to filter statements up to. + :type offset: int + + :returns: This scope node and the list of assignments associated to the + given name according to the scope where it has been found (locals, + globals or builtin). + :rtype: tuple(str, list(NodeNG)) + """ + # pylint: disable=no-member; github.com/pycqa/astroid/issues/291 + # args is in fact redefined later on by postinit. Can't be changed + # to None due to a strong interaction between Lambda and FunctionDef. + + if node in self.args.defaults or node in self.args.kw_defaults: + frame = self.parent.frame() + # line offset to avoid that def func(f=func) resolve the default + # value to the defined function + offset = -1 + else: + # check this is not used in function decorators + frame = self + return frame._scope_lookup(node, name, offset) + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`Lambda` this is always ``True``. + :rtype: bool + """ + return True + + def get_children(self): + yield self.args + yield self.body + + +class FunctionDef(mixins.MultiLineBlockMixin, node_classes.Statement, Lambda): + """Class representing an :class:`ast.FunctionDef`. + + >>> node = astroid.extract_node(''' + ... def my_func(arg): + ... return arg + 1 + ... ''') + >>> node + + """ + + _astroid_fields = ("decorators", "args", "returns", "body") + _multi_line_block_fields = ("body",) + returns = None + decorators = None + """The decorators that are applied to this method or function. + + :type: Decorators or None + """ + special_attributes = objectmodel.FunctionModel() + """The names of special attributes that this function has. + + :type: objectmodel.FunctionModel + """ + is_function = True + """Whether this node indicates a function. + + For a :class:`FunctionDef` this is always ``True``. + + :type: bool + """ + type_annotation = None + """If present, this will contain the type annotation passed by a type comment + + :type: NodeNG or None + """ + type_comment_args = None + """ + If present, this will contain the type annotation for arguments + passed by a type comment + """ + type_comment_returns = None + """If present, this will contain the return type annotation, passed by a type comment""" + # attributes below are set by the builder module or by raw factories + _other_fields = ("name", "doc") + _other_other_fields = ( + "locals", + "_type", + "type_comment_returns", + "type_comment_args", + ) + _type = None + + def __init__(self, name=None, doc=None, lineno=None, col_offset=None, parent=None): + """ + :param name: The name of the function. + :type name: str or None + + :param doc: The function's docstring. + :type doc: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.name = name + """The name of the function. + + :type name: str or None + """ + + self.doc = doc + """The function's docstring. + + :type doc: str or None + """ + + self.instance_attrs = {} + super(FunctionDef, self).__init__(lineno, col_offset, parent) + if parent: + frame = parent.frame() + frame.set_local(name, self) + + # pylint: disable=arguments-differ; different than Lambdas + def postinit( + self, + args, + body, + decorators=None, + returns=None, + type_comment_returns=None, + type_comment_args=None, + ): + """Do some setup after initialisation. + + :param args: The arguments that the function takes. + :type args: Arguments or list + + :param body: The contents of the function body. + :type body: list(NodeNG) + + :param decorators: The decorators that are applied to this + method or function. + :type decorators: Decorators or None + :params type_comment_returns: + The return type annotation passed via a type comment. + :params type_comment_args: + The args type annotation passed via a type comment. + """ + self.args = args + self.body = body + self.decorators = decorators + self.returns = returns + self.type_comment_returns = type_comment_returns + self.type_comment_args = type_comment_args + + if isinstance(self.parent.frame(), ClassDef): + self.set_local("__class__", self.parent.frame()) + + @decorators_mod.cachedproperty + def extra_decorators(self): + """The extra decorators that this function can have. + + Additional decorators are considered when they are used as + assignments, as in ``method = staticmethod(method)``. + The property will return all the callables that are used for + decoration. + + :type: list(NodeNG) + """ + frame = self.parent.frame() + if not isinstance(frame, ClassDef): + return [] + + decorators = [] + for assign in frame._get_assign_nodes(): + if isinstance(assign.value, node_classes.Call) and isinstance( + assign.value.func, node_classes.Name + ): + for assign_node in assign.targets: + if not isinstance(assign_node, node_classes.AssignName): + # Support only `name = callable(name)` + continue + + if assign_node.name != self.name: + # Interested only in the assignment nodes that + # decorates the current method. + continue + try: + meth = frame[self.name] + except KeyError: + continue + else: + # Must be a function and in the same frame as the + # original method. + if ( + isinstance(meth, FunctionDef) + and assign_node.frame() == frame + ): + decorators.append(assign.value) + return decorators + + @decorators_mod.cachedproperty + def type(self): + """The function type for this node. + + Possible values are: method, function, staticmethod, classmethod. + + :type: str + """ + builtin_descriptors = {"classmethod", "staticmethod"} + + for decorator in self.extra_decorators: + if decorator.func.name in builtin_descriptors: + return decorator.func.name + + frame = self.parent.frame() + type_name = "function" + if isinstance(frame, ClassDef): + if self.name == "__new__": + return "classmethod" + if sys.version_info >= (3, 6) and self.name == "__init_subclass__": + return "classmethod" + + type_name = "method" + + if not self.decorators: + return type_name + + for node in self.decorators.nodes: + if isinstance(node, node_classes.Name): + if node.name in builtin_descriptors: + return node.name + + if isinstance(node, node_classes.Call): + # Handle the following case: + # @some_decorator(arg1, arg2) + # def func(...) + # + try: + current = next(node.func.infer()) + except exceptions.InferenceError: + continue + _type = _infer_decorator_callchain(current) + if _type is not None: + return _type + + try: + for inferred in node.infer(): + # Check to see if this returns a static or a class method. + _type = _infer_decorator_callchain(inferred) + if _type is not None: + return _type + + if not isinstance(inferred, ClassDef): + continue + for ancestor in inferred.ancestors(): + if not isinstance(ancestor, ClassDef): + continue + if ancestor.is_subtype_of("%s.classmethod" % BUILTINS): + return "classmethod" + if ancestor.is_subtype_of("%s.staticmethod" % BUILTINS): + return "staticmethod" + except exceptions.InferenceError: + pass + return type_name + + @decorators_mod.cachedproperty + def fromlineno(self): + """The first line that this node appears on in the source code. + + :type: int or None + """ + # lineno is the line number of the first decorator, we want the def + # statement lineno + lineno = self.lineno + if self.decorators is not None: + lineno += sum( + node.tolineno - node.lineno + 1 for node in self.decorators.nodes + ) + + return lineno + + @decorators_mod.cachedproperty + def blockstart_tolineno(self): + """The line on which the beginning of this block ends. + + :type: int + """ + return self.args.tolineno + + def block_range(self, lineno): + """Get a range from the given line number to where this node ends. + + :param lineno: Unused. + :type lineno: int + + :returns: The range of line numbers that this node belongs to, + :rtype: tuple(int, int) + """ + return self.fromlineno, self.tolineno + + def getattr(self, name, context=None): + """this method doesn't look in the instance_attrs dictionary since it's + done by an Instance proxy at inference time. + """ + if name in self.instance_attrs: + return self.instance_attrs[name] + if name in self.special_attributes: + return [self.special_attributes.lookup(name)] + raise exceptions.AttributeInferenceError(target=self, attribute=name) + + def igetattr(self, name, context=None): + """Inferred getattr, which returns an iterator of inferred statements.""" + try: + return bases._infer_stmts(self.getattr(name, context), context, frame=self) + except exceptions.AttributeInferenceError as error: + raise exceptions.InferenceError( + error.message, target=self, attribute=name, context=context + ) from error + + def is_method(self): + """Check if this function node represents a method. + + :returns: True if this is a method, False otherwise. + :rtype: bool + """ + # check we are defined in a ClassDef, because this is usually expected + # (e.g. pylint...) when is_method() return True + return self.type != "function" and isinstance(self.parent.frame(), ClassDef) + + @decorators_mod.cached + def decoratornames(self): + """Get the qualified names of each of the decorators on this function. + + :returns: The names of the decorators. + :rtype: set(str) + """ + result = set() + decoratornodes = [] + if self.decorators is not None: + decoratornodes += self.decorators.nodes + decoratornodes += self.extra_decorators + for decnode in decoratornodes: + try: + for infnode in decnode.infer(): + result.add(infnode.qname()) + except exceptions.InferenceError: + continue + return result + + def is_bound(self): + """Check if the function is bound to an instance or class. + + :returns: True if the function is bound to an instance or class, + False otherwise. + :rtype: bool + """ + return self.type == "classmethod" + + def is_abstract(self, pass_is_abstract=True): + """Check if the method is abstract. + + A method is considered abstract if any of the following is true: + * The only statement is 'raise NotImplementedError' + * The only statement is 'pass' and pass_is_abstract is True + * The method is annotated with abc.astractproperty/abc.abstractmethod + + :returns: True if the method is abstract, False otherwise. + :rtype: bool + """ + if self.decorators: + for node in self.decorators.nodes: + try: + inferred = next(node.infer()) + except exceptions.InferenceError: + continue + if inferred and inferred.qname() in ( + "abc.abstractproperty", + "abc.abstractmethod", + ): + return True + + for child_node in self.body: + if isinstance(child_node, node_classes.Raise): + if child_node.raises_not_implemented(): + return True + return pass_is_abstract and isinstance(child_node, node_classes.Pass) + # empty function is the same as function with a single "pass" statement + if pass_is_abstract: + return True + + def is_generator(self): + """Check if this is a generator function. + + :returns: True is this is a generator function, False otherwise. + :rtype: bool + """ + return next(self._get_yield_nodes_skip_lambdas(), False) + + def infer_call_result(self, caller=None, context=None): + """Infer what the function returns when called. + + :returns: What the function returns. + :rtype: iterable(NodeNG or Uninferable) or None + """ + if self.is_generator(): + if isinstance(self, AsyncFunctionDef): + generator_cls = bases.AsyncGenerator + else: + generator_cls = bases.Generator + result = generator_cls(self) + yield result + return + # This is really a gigantic hack to work around metaclass generators + # that return transient class-generating functions. Pylint's AST structure + # cannot handle a base class object that is only used for calling __new__, + # but does not contribute to the inheritance structure itself. We inject + # a fake class into the hierarchy here for several well-known metaclass + # generators, and filter it out later. + if ( + self.name == "with_metaclass" + and len(self.args.args) == 1 + and self.args.vararg is not None + ): + metaclass = next(caller.args[0].infer(context)) + if isinstance(metaclass, ClassDef): + class_bases = [next(arg.infer(context)) for arg in caller.args[1:]] + new_class = ClassDef(name="temporary_class") + new_class.hide = True + new_class.parent = self + new_class.postinit( + bases=[base for base in class_bases if base != util.Uninferable], + body=[], + decorators=[], + metaclass=metaclass, + ) + yield new_class + return + returns = self._get_return_nodes_skip_functions() + + first_return = next(returns, None) + if not first_return: + raise exceptions.InferenceError("Empty return iterator") + + for returnnode in itertools.chain((first_return,), returns): + if returnnode.value is None: + yield node_classes.Const(None) + else: + try: + yield from returnnode.value.infer(context) + except exceptions.InferenceError: + yield util.Uninferable + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`FunctionDef` this is always ``True``. + :rtype: bool + """ + return True + + def get_children(self): + if self.decorators is not None: + yield self.decorators + + yield self.args + + if self.returns is not None: + yield self.returns + + yield from self.body + + +class AsyncFunctionDef(FunctionDef): + """Class representing an :class:`ast.FunctionDef` node. + + A :class:`AsyncFunctionDef` is an asynchronous function + created with the `async` keyword. + + >>> node = astroid.extract_node(''' + async def func(things): + async for thing in things: + print(thing) + ''') + >>> node + + >>> node.body[0] + + """ + + +def _rec_get_names(args, names=None): + """return a list of all argument names""" + if names is None: + names = [] + for arg in args: + if isinstance(arg, node_classes.Tuple): + _rec_get_names(arg.elts, names) + else: + names.append(arg.name) + return names + + +def _is_metaclass(klass, seen=None): + """ Return if the given class can be + used as a metaclass. + """ + if klass.name == "type": + return True + if seen is None: + seen = set() + for base in klass.bases: + try: + for baseobj in base.infer(): + baseobj_name = baseobj.qname() + if baseobj_name in seen: + continue + else: + seen.add(baseobj_name) + if isinstance(baseobj, bases.Instance): + # not abstract + return False + if baseobj is util.Uninferable: + continue + if baseobj is klass: + continue + if not isinstance(baseobj, ClassDef): + continue + if baseobj._type == "metaclass": + return True + if _is_metaclass(baseobj, seen): + return True + except exceptions.InferenceError: + continue + return False + + +def _class_type(klass, ancestors=None): + """return a ClassDef node type to differ metaclass and exception + from 'regular' classes + """ + # XXX we have to store ancestors in case we have an ancestor loop + if klass._type is not None: + return klass._type + if _is_metaclass(klass): + klass._type = "metaclass" + elif klass.name.endswith("Exception"): + klass._type = "exception" + else: + if ancestors is None: + ancestors = set() + klass_name = klass.qname() + if klass_name in ancestors: + # XXX we are in loop ancestors, and have found no type + klass._type = "class" + return "class" + ancestors.add(klass_name) + for base in klass.ancestors(recurs=False): + name = _class_type(base, ancestors) + if name != "class": + if name == "metaclass" and not _is_metaclass(klass): + # don't propagate it if the current class + # can't be a metaclass + continue + klass._type = base.type + break + if klass._type is None: + klass._type = "class" + return klass._type + + +def get_wrapping_class(node): + """Get the class that wraps the given node. + + We consider that a class wraps a node if the class + is a parent for the said node. + + :returns: The class that wraps the given node + :rtype: ClassDef or None + """ + + klass = node.frame() + while klass is not None and not isinstance(klass, ClassDef): + if klass.parent is None: + klass = None + else: + klass = klass.parent.frame() + return klass + + +class ClassDef(mixins.FilterStmtsMixin, LocalsDictNodeNG, node_classes.Statement): + """Class representing an :class:`ast.ClassDef` node. + + >>> node = astroid.extract_node(''' + class Thing: + def my_meth(self, arg): + return arg + self.offset + ''') + >>> node + + """ + + # some of the attributes below are set by the builder module or + # by a raw factories + + # a dictionary of class instances attributes + _astroid_fields = ("decorators", "bases", "body") # name + + decorators = None + """The decorators that are applied to this class. + + :type: Decorators or None + """ + special_attributes = objectmodel.ClassModel() + """The names of special attributes that this class has. + + :type: objectmodel.ClassModel + """ + + _type = None + _metaclass_hack = False + hide = False + type = property( + _class_type, + doc=( + "The class type for this node.\n\n" + "Possible values are: class, metaclass, exception.\n\n" + ":type: str" + ), + ) + _other_fields = ("name", "doc") + _other_other_fields = ("locals", "_newstyle") + _newstyle = None + + def __init__(self, name=None, doc=None, lineno=None, col_offset=None, parent=None): + """ + :param name: The name of the class. + :type name: str or None + + :param doc: The function's docstring. + :type doc: str or None + + :param lineno: The line that this node appears on in the source code. + :type lineno: int or None + + :param col_offset: The column that this node appears on in the + source code. + :type col_offset: int or None + + :param parent: The parent node in the syntax tree. + :type parent: NodeNG or None + """ + self.instance_attrs = {} + self.locals = {} + """A map of the name of a local variable to the node defining it. + + :type: dict(str, NodeNG) + """ + + self.keywords = [] + """The keywords given to the class definition. + + This is usually for :pep:`3115` style metaclass declaration. + + :type: list(Keyword) or None + """ + + self.bases = [] + """What the class inherits from. + + :type: list(NodeNG) + """ + + self.body = [] + """The contents of the class body. + + :type: list(NodeNG) + """ + + self.name = name + """The name of the class. + + :type name: str or None + """ + + self.doc = doc + """The class' docstring. + + :type doc: str or None + """ + + super(ClassDef, self).__init__(lineno, col_offset, parent) + if parent is not None: + parent.frame().set_local(name, self) + + for local_name, node in self.implicit_locals(): + self.add_local_node(node, local_name) + + def implicit_parameters(self): + return 1 + + def implicit_locals(self): + """Get implicitly defined class definition locals. + + :returns: the the name and Const pair for each local + :rtype: tuple(tuple(str, node_classes.Const), ...) + """ + locals_ = (("__module__", self.special_attributes.attr___module__),) + if sys.version_info >= (3, 3): + # __qualname__ is defined in PEP3155 + locals_ += (("__qualname__", self.special_attributes.attr___qualname__),) + return locals_ + + # pylint: disable=redefined-outer-name + def postinit( + self, bases, body, decorators, newstyle=None, metaclass=None, keywords=None + ): + """Do some setup after initialisation. + + :param bases: What the class inherits from. + :type bases: list(NodeNG) + + :param body: The contents of the class body. + :type body: list(NodeNG) + + :param decorators: The decorators that are applied to this class. + :type decorators: Decorators or None + + :param newstyle: Whether this is a new style class or not. + :type newstyle: bool or None + + :param metaclass: The metaclass of this class. + :type metaclass: NodeNG or None + + :param keywords: The keywords given to the class definition. + :type keywords: list(Keyword) or None + """ + self.keywords = keywords + self.bases = bases + self.body = body + self.decorators = decorators + if newstyle is not None: + self._newstyle = newstyle + if metaclass is not None: + self._metaclass = metaclass + + def _newstyle_impl(self, context=None): + if context is None: + context = contextmod.InferenceContext() + if self._newstyle is not None: + return self._newstyle + for base in self.ancestors(recurs=False, context=context): + if base._newstyle_impl(context): + self._newstyle = True + break + klass = self.declared_metaclass() + # could be any callable, we'd need to infer the result of klass(name, + # bases, dict). punt if it's not a class node. + if klass is not None and isinstance(klass, ClassDef): + self._newstyle = klass._newstyle_impl(context) + if self._newstyle is None: + self._newstyle = False + return self._newstyle + + _newstyle = None + newstyle = property( + _newstyle_impl, + doc=("Whether this is a new style class or not\n\n" ":type: bool or None"), + ) + + @decorators_mod.cachedproperty + def blockstart_tolineno(self): + """The line on which the beginning of this block ends. + + :type: int + """ + if self.bases: + return self.bases[-1].tolineno + + return self.fromlineno + + def block_range(self, lineno): + """Get a range from the given line number to where this node ends. + + :param lineno: Unused. + :type lineno: int + + :returns: The range of line numbers that this node belongs to, + :rtype: tuple(int, int) + """ + return self.fromlineno, self.tolineno + + def pytype(self): + """Get the name of the type that this node represents. + + :returns: The name of the type. + :rtype: str + """ + if self.newstyle: + return "%s.type" % BUILTINS + return "%s.classobj" % BUILTINS + + def display_type(self): + """A human readable type of this node. + + :returns: The type of this node. + :rtype: str + """ + return "Class" + + def callable(self): + """Whether this node defines something that is callable. + + :returns: True if this defines something that is callable, + False otherwise. + For a :class:`ClassDef` this is always ``True``. + :rtype: bool + """ + return True + + def is_subtype_of(self, type_name, context=None): + """Whether this class is a subtype of the given type. + + :param type_name: The name of the type of check against. + :type type_name: str + + :returns: True if this class is a subtype of the given type, + False otherwise. + :rtype: bool + """ + if self.qname() == type_name: + return True + for anc in self.ancestors(context=context): + if anc.qname() == type_name: + return True + return False + + def _infer_type_call(self, caller, context): + name_node = next(caller.args[0].infer(context)) + if isinstance(name_node, node_classes.Const) and isinstance( + name_node.value, str + ): + name = name_node.value + else: + return util.Uninferable + + result = ClassDef(name, None) + + # Get the bases of the class. + class_bases = next(caller.args[1].infer(context)) + if isinstance(class_bases, (node_classes.Tuple, node_classes.List)): + result.bases = class_bases.itered() + else: + # There is currently no AST node that can represent an 'unknown' + # node (Uninferable is not an AST node), therefore we simply return Uninferable here + # although we know at least the name of the class. + return util.Uninferable + + # Get the members of the class + try: + members = next(caller.args[2].infer(context)) + except exceptions.InferenceError: + members = None + + if members and isinstance(members, node_classes.Dict): + for attr, value in members.items: + if isinstance(attr, node_classes.Const) and isinstance(attr.value, str): + result.locals[attr.value] = [value] + + result.parent = caller.parent + return result + + def infer_call_result(self, caller, context=None): + """infer what a class is returning when called""" + if ( + self.is_subtype_of("%s.type" % (BUILTINS,), context) + and len(caller.args) == 3 + ): + result = self._infer_type_call(caller, context) + yield result + return + + dunder_call = None + try: + metaclass = self.metaclass(context=context) + if metaclass is not None: + dunder_call = next(metaclass.igetattr("__call__", context)) + except exceptions.AttributeInferenceError: + pass + if dunder_call and dunder_call.qname() != "builtins.type.__call__": + context = contextmod.bind_context_to_node(context, self) + yield from dunder_call.infer_call_result(caller, context) + else: + # Call type.__call__ if not set metaclass + # (since type is the default metaclass) + yield bases.Instance(self) + + def scope_lookup(self, node, name, offset=0): + """Lookup where the given name is assigned. + + :param node: The node to look for assignments up to. + Any assignments after the given node are ignored. + :type node: NodeNG + + :param name: The name to find assignments for. + :type name: str + + :param offset: The line offset to filter statements up to. + :type offset: int + + :returns: This scope node and the list of assignments associated to the + given name according to the scope where it has been found (locals, + globals or builtin). + :rtype: tuple(str, list(NodeNG)) + """ + # If the name looks like a builtin name, just try to look + # into the upper scope of this class. We might have a + # decorator that it's poorly named after a builtin object + # inside this class. + lookup_upper_frame = ( + isinstance(node.parent, node_classes.Decorators) + and name in MANAGER.builtins_module + ) + if ( + any(node == base or base.parent_of(node) for base in self.bases) + or lookup_upper_frame + ): + # Handle the case where we have either a name + # in the bases of a class, which exists before + # the actual definition or the case where we have + # a Getattr node, with that name. + # + # name = ... + # class A(name): + # def name(self): ... + # + # import name + # class A(name.Name): + # def name(self): ... + + frame = self.parent.frame() + # line offset to avoid that class A(A) resolve the ancestor to + # the defined class + offset = -1 + else: + frame = self + return frame._scope_lookup(node, name, offset) + + @property + def basenames(self): + """The names of the parent classes + + Names are given in the order they appear in the class definition. + + :type: list(str) + """ + return [bnode.as_string() for bnode in self.bases] + + def ancestors(self, recurs=True, context=None): + """Iterate over the base classes in prefixed depth first order. + + :param recurs: Whether to recurse or return direct ancestors only. + :type recurs: bool + + :returns: The base classes + :rtype: iterable(NodeNG) + """ + # FIXME: should be possible to choose the resolution order + # FIXME: inference make infinite loops possible here + yielded = {self} + if context is None: + context = contextmod.InferenceContext() + if not self.bases and self.qname() != "builtins.object": + yield builtin_lookup("object")[1][0] + return + + for stmt in self.bases: + with context.restore_path(): + try: + for baseobj in stmt.infer(context): + if not isinstance(baseobj, ClassDef): + if isinstance(baseobj, bases.Instance): + baseobj = baseobj._proxied + else: + continue + if not baseobj.hide: + if baseobj in yielded: + continue + yielded.add(baseobj) + yield baseobj + if not recurs: + continue + for grandpa in baseobj.ancestors(recurs=True, context=context): + if grandpa is self: + # This class is the ancestor of itself. + break + if grandpa in yielded: + continue + yielded.add(grandpa) + yield grandpa + except exceptions.InferenceError: + continue + + def local_attr_ancestors(self, name, context=None): + """Iterate over the parents that define the given name. + + :param name: The name to find definitions for. + :type name: str + + :returns: The parents that define the given name. + :rtype: iterable(NodeNG) + """ + # Look up in the mro if we can. This will result in the + # attribute being looked up just as Python does it. + try: + ancestors = self.mro(context)[1:] + except exceptions.MroError: + # Fallback to use ancestors, we can't determine + # a sane MRO. + ancestors = self.ancestors(context=context) + for astroid in ancestors: + if name in astroid: + yield astroid + + def instance_attr_ancestors(self, name, context=None): + """Iterate over the parents that define the given name as an attribute. + + :param name: The name to find definitions for. + :type name: str + + :returns: The parents that define the given name as + an instance attribute. + :rtype: iterable(NodeNG) + """ + for astroid in self.ancestors(context=context): + if name in astroid.instance_attrs: + yield astroid + + def has_base(self, node): + """Whether this class directly inherits from the given node. + + :param node: The node to check for. + :type node: NodeNG + + :returns: True if this class directly inherits from the given node. + :rtype: bool + """ + return node in self.bases + + def local_attr(self, name, context=None): + """Get the list of assign nodes associated to the given name. + + Assignments are looked for in both this class and in parents. + + :returns: The list of assignments to the given name. + :rtype: list(NodeNG) + + :raises AttributeInferenceError: If no attribute with this name + can be found in this class or parent classes. + """ + result = [] + if name in self.locals: + result = self.locals[name] + else: + class_node = next(self.local_attr_ancestors(name, context), None) + if class_node: + result = class_node.locals[name] + result = [n for n in result if not isinstance(n, node_classes.DelAttr)] + if result: + return result + raise exceptions.AttributeInferenceError( + target=self, attribute=name, context=context + ) + + def instance_attr(self, name, context=None): + """Get the list of nodes associated to the given attribute name. + + Assignments are looked for in both this class and in parents. + + :returns: The list of assignments to the given name. + :rtype: list(NodeNG) + + :raises AttributeInferenceError: If no attribute with this name + can be found in this class or parent classes. + """ + # Return a copy, so we don't modify self.instance_attrs, + # which could lead to infinite loop. + values = list(self.instance_attrs.get(name, [])) + # get all values from parents + for class_node in self.instance_attr_ancestors(name, context): + values += class_node.instance_attrs[name] + values = [n for n in values if not isinstance(n, node_classes.DelAttr)] + if values: + return values + raise exceptions.AttributeInferenceError( + target=self, attribute=name, context=context + ) + + def instantiate_class(self): + """Get an :class:`Instance` of the :class:`ClassDef` node. + + :returns: An :class:`Instance` of the :class:`ClassDef` node, + or self if this is not possible. + :rtype: Instance or ClassDef + """ + return bases.Instance(self) + + def getattr(self, name, context=None, class_context=True): + """Get an attribute from this class, using Python's attribute semantic. + + This method doesn't look in the :attr:`instance_attrs` dictionary + since it is done by an :class:`Instance` proxy at inference time. + It may return an :class:`Uninferable` object if + the attribute has not been + found, but a ``__getattr__`` or ``__getattribute__`` method is defined. + If ``class_context`` is given, then it is considered that the + attribute is accessed from a class context, + e.g. ClassDef.attribute, otherwise it might have been accessed + from an instance as well. If ``class_context`` is used in that + case, then a lookup in the implicit metaclass and the explicit + metaclass will be done. + + :param name: The attribute to look for. + :type name: str + + :param class_context: Whether the attribute can be accessed statically. + :type class_context: bool + + :returns: The attribute. + :rtype: list(NodeNG) + + :raises AttributeInferenceError: If the attribute cannot be inferred. + """ + values = self.locals.get(name, []) + if name in self.special_attributes and class_context and not values: + result = [self.special_attributes.lookup(name)] + if name == "__bases__": + # Need special treatment, since they are mutable + # and we need to return all the values. + result += values + return result + + # don't modify the list in self.locals! + values = list(values) + for classnode in self.ancestors(recurs=True, context=context): + values += classnode.locals.get(name, []) + + if class_context: + values += self._metaclass_lookup_attribute(name, context) + + if not values: + raise exceptions.AttributeInferenceError( + target=self, attribute=name, context=context + ) + return values + + def _metaclass_lookup_attribute(self, name, context): + """Search the given name in the implicit and the explicit metaclass.""" + attrs = set() + implicit_meta = self.implicit_metaclass() + metaclass = self.metaclass() + for cls in {implicit_meta, metaclass}: + if cls and cls != self and isinstance(cls, ClassDef): + cls_attributes = self._get_attribute_from_metaclass(cls, name, context) + attrs.update(set(cls_attributes)) + return attrs + + def _get_attribute_from_metaclass(self, cls, name, context): + try: + attrs = cls.getattr(name, context=context, class_context=True) + except exceptions.AttributeInferenceError: + return + + for attr in bases._infer_stmts(attrs, context, frame=cls): + if not isinstance(attr, FunctionDef): + yield attr + continue + + if bases._is_property(attr): + yield from attr.infer_call_result(self, context) + continue + if attr.type == "classmethod": + # If the method is a classmethod, then it will + # be bound to the metaclass, not to the class + # from where the attribute is retrieved. + # get_wrapping_class could return None, so just + # default to the current class. + frame = get_wrapping_class(attr) or self + yield bases.BoundMethod(attr, frame) + elif attr.type == "staticmethod": + yield attr + else: + yield bases.BoundMethod(attr, self) + + def igetattr(self, name, context=None, class_context=True): + """Infer the possible values of the given variable. + + :param name: The name of the variable to infer. + :type name: str + + :returns: The inferred possible values. + :rtype: iterable(NodeNG or Uninferable) + """ + # set lookup name since this is necessary to infer on import nodes for + # instance + context = contextmod.copy_context(context) + context.lookupname = name + try: + attr = self.getattr(name, context, class_context=class_context)[0] + for inferred in bases._infer_stmts([attr], context, frame=self): + # yield Uninferable object instead of descriptors when necessary + if not isinstance(inferred, node_classes.Const) and isinstance( + inferred, bases.Instance + ): + try: + inferred._proxied.getattr("__get__", context) + except exceptions.AttributeInferenceError: + yield inferred + else: + yield util.Uninferable + else: + yield function_to_method(inferred, self) + except exceptions.AttributeInferenceError as error: + if not name.startswith("__") and self.has_dynamic_getattr(context): + # class handle some dynamic attributes, return a Uninferable object + yield util.Uninferable + else: + raise exceptions.InferenceError( + error.message, target=self, attribute=name, context=context + ) + + def has_dynamic_getattr(self, context=None): + """Check if the class has a custom __getattr__ or __getattribute__. + + If any such method is found and it is not from + builtins, nor from an extension module, then the function + will return True. + + :returns: True if the class has a custom + __getattr__ or __getattribute__, False otherwise. + :rtype: bool + """ + + def _valid_getattr(node): + root = node.root() + return root.name != BUILTINS and getattr(root, "pure_python", None) + + try: + return _valid_getattr(self.getattr("__getattr__", context)[0]) + except exceptions.AttributeInferenceError: + # if self.newstyle: XXX cause an infinite recursion error + try: + getattribute = self.getattr("__getattribute__", context)[0] + return _valid_getattr(getattribute) + except exceptions.AttributeInferenceError: + pass + return False + + def getitem(self, index, context=None): + """Return the inference of a subscript. + + This is basically looking up the method in the metaclass and calling it. + + :returns: The inferred value of a subscript to this class. + :rtype: NodeNG + + :raises AstroidTypeError: If this class does not define a + ``__getitem__`` method. + """ + try: + methods = dunder_lookup.lookup(self, "__getitem__") + except exceptions.AttributeInferenceError as exc: + raise exceptions.AstroidTypeError(node=self, context=context) from exc + + method = methods[0] + + # Create a new callcontext for providing index as an argument. + new_context = contextmod.bind_context_to_node(context, self) + new_context.callcontext = contextmod.CallContext(args=[index]) + + try: + return next(method.infer_call_result(self, new_context)) + except exceptions.InferenceError: + return util.Uninferable + + def methods(self): + """Iterate over all of the method defined in this class and its parents. + + :returns: The methods defined on the class. + :rtype: iterable(FunctionDef) + """ + done = {} + for astroid in itertools.chain(iter((self,)), self.ancestors()): + for meth in astroid.mymethods(): + if meth.name in done: + continue + done[meth.name] = None + yield meth + + def mymethods(self): + """Iterate over all of the method defined in this class only. + + :returns: The methods defined on the class. + :rtype: iterable(FunctionDef) + """ + for member in self.values(): + if isinstance(member, FunctionDef): + yield member + + def implicit_metaclass(self): + """Get the implicit metaclass of the current class. + + For newstyle classes, this will return an instance of builtins.type. + For oldstyle classes, it will simply return None, since there's + no implicit metaclass there. + + :returns: The metaclass. + :rtype: builtins.type or None + """ + if self.newstyle: + return builtin_lookup("type")[1][0] + return None + + _metaclass = None + + def declared_metaclass(self, context=None): + """Return the explicit declared metaclass for the current class. + + An explicit declared metaclass is defined + either by passing the ``metaclass`` keyword argument + in the class definition line (Python 3) or (Python 2) by + having a ``__metaclass__`` class attribute, or if there are + no explicit bases but there is a global ``__metaclass__`` variable. + + :returns: The metaclass of this class, + or None if one could not be found. + :rtype: NodeNG or None + """ + for base in self.bases: + try: + for baseobj in base.infer(context=context): + if isinstance(baseobj, ClassDef) and baseobj.hide: + self._metaclass = baseobj._metaclass + self._metaclass_hack = True + break + except exceptions.InferenceError: + pass + + if self._metaclass: + # Expects this from Py3k TreeRebuilder + try: + return next( + node + for node in self._metaclass.infer(context=context) + if node is not util.Uninferable + ) + except (exceptions.InferenceError, StopIteration): + return None + + return None + + def _find_metaclass(self, seen=None, context=None): + if seen is None: + seen = set() + seen.add(self) + + klass = self.declared_metaclass(context=context) + if klass is None: + for parent in self.ancestors(context=context): + if parent not in seen: + klass = parent._find_metaclass(seen) + if klass is not None: + break + return klass + + def metaclass(self, context=None): + """Get the metaclass of this class. + + If this class does not define explicitly a metaclass, + then the first defined metaclass in ancestors will be used + instead. + + :returns: The metaclass of this class. + :rtype: NodeNG or None + """ + return self._find_metaclass(context=context) + + def has_metaclass_hack(self): + return self._metaclass_hack + + def _islots(self): + """ Return an iterator with the inferred slots. """ + if "__slots__" not in self.locals: + return None + for slots in self.igetattr("__slots__"): + # check if __slots__ is a valid type + for meth in ITER_METHODS: + try: + slots.getattr(meth) + break + except exceptions.AttributeInferenceError: + continue + else: + continue + + if isinstance(slots, node_classes.Const): + # a string. Ignore the following checks, + # but yield the node, only if it has a value + if slots.value: + yield slots + continue + if not hasattr(slots, "itered"): + # we can't obtain the values, maybe a .deque? + continue + + if isinstance(slots, node_classes.Dict): + values = [item[0] for item in slots.items] + else: + values = slots.itered() + if values is util.Uninferable: + continue + if not values: + # Stop the iteration, because the class + # has an empty list of slots. + return values + + for elt in values: + try: + for inferred in elt.infer(): + if inferred is util.Uninferable: + continue + if not isinstance( + inferred, node_classes.Const + ) or not isinstance(inferred.value, str): + continue + if not inferred.value: + continue + yield inferred + except exceptions.InferenceError: + continue + + return None + + def _slots(self): + if not self.newstyle: + raise NotImplementedError( + "The concept of slots is undefined for old-style classes." + ) + + slots = self._islots() + try: + first = next(slots) + except StopIteration as exc: + # The class doesn't have a __slots__ definition or empty slots. + if exc.args and exc.args[0] not in ("", None): + return exc.args[0] + return None + return [first] + list(slots) + + # Cached, because inferring them all the time is expensive + @decorators_mod.cached + def slots(self): + """Get all the slots for this node. + + :returns: The names of slots for this class. + If the class doesn't define any slot, through the ``__slots__`` + variable, then this function will return a None. + Also, it will return None in the case the slots were not inferred. + :rtype: list(str) or None + """ + + def grouped_slots(): + # Not interested in object, since it can't have slots. + for cls in self.mro()[:-1]: + try: + cls_slots = cls._slots() + except NotImplementedError: + continue + if cls_slots is not None: + yield from cls_slots + else: + yield None + + if not self.newstyle: + raise NotImplementedError( + "The concept of slots is undefined for old-style classes." + ) + + slots = list(grouped_slots()) + if not all(slot is not None for slot in slots): + return None + + return sorted(slots, key=lambda item: item.value) + + def _inferred_bases(self, context=None): + # Similar with .ancestors, but the difference is when one base is inferred, + # only the first object is wanted. That's because + # we aren't interested in superclasses, as in the following + # example: + # + # class SomeSuperClass(object): pass + # class SomeClass(SomeSuperClass): pass + # class Test(SomeClass): pass + # + # Inferring SomeClass from the Test's bases will give + # us both SomeClass and SomeSuperClass, but we are interested + # only in SomeClass. + + if context is None: + context = contextmod.InferenceContext() + if not self.bases and self.qname() != "builtins.object": + yield builtin_lookup("object")[1][0] + return + + for stmt in self.bases: + try: + baseobj = next(stmt.infer(context=context)) + except exceptions.InferenceError: + continue + if isinstance(baseobj, bases.Instance): + baseobj = baseobj._proxied + if not isinstance(baseobj, ClassDef): + continue + if not baseobj.hide: + yield baseobj + else: + yield from baseobj.bases + + def _compute_mro(self, context=None): + inferred_bases = list(self._inferred_bases(context=context)) + bases_mro = [] + for base in inferred_bases: + if base is self: + continue + + try: + mro = base._compute_mro(context=context) + bases_mro.append(mro) + except NotImplementedError: + # Some classes have in their ancestors both newstyle and + # old style classes. For these we can't retrieve the .mro, + # although in Python it's possible, since the class we are + # currently working is in fact new style. + # So, we fallback to ancestors here. + ancestors = list(base.ancestors(context=context)) + bases_mro.append(ancestors) + + unmerged_mro = [[self]] + bases_mro + [inferred_bases] + _verify_duplicates_mro(unmerged_mro, self, context) + return _c3_merge(unmerged_mro, self, context) + + def mro(self, context=None) -> List["ClassDef"]: + """Get the method resolution order, using C3 linearization. + + :returns: The list of ancestors, sorted by the mro. + :rtype: list(NodeNG) + :raises DuplicateBasesError: Duplicate bases in the same class base + :raises InconsistentMroError: A class' MRO is inconsistent + """ + return self._compute_mro(context=context) + + def bool_value(self): + """Determine the boolean value of this node. + + :returns: The boolean value of this node. + For a :class:`ClassDef` this is always ``True``. + :rtype: bool + """ + return True + + def get_children(self): + if self.decorators is not None: + yield self.decorators + + yield from self.bases + yield from self.body + + @decorators_mod.cached + def _get_assign_nodes(self): + children_assign_nodes = ( + child_node._get_assign_nodes() for child_node in self.body + ) + return list(itertools.chain.from_iterable(children_assign_nodes)) diff --git a/venv/lib/python3.7/site-packages/astroid/test_utils.py b/venv/lib/python3.7/site-packages/astroid/test_utils.py new file mode 100644 index 0000000..55b7e84 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/test_utils.py @@ -0,0 +1,71 @@ +# Copyright (c) 2013-2014 Google, Inc. +# Copyright (c) 2014 LOGILAB S.A. (Paris, FRANCE) +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2016 Jakub Wilk +# Copyright (c) 2018 Anthony Sottile + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +"""Utility functions for test code that uses astroid ASTs as input.""" +import contextlib +import functools +import sys +import warnings + +from astroid import nodes + + +def require_version(minver=None, maxver=None): + """ Compare version of python interpreter to the given one. Skip the test + if older. + """ + + def parse(string, default=None): + string = string or default + try: + return tuple(int(v) for v in string.split(".")) + except ValueError as exc: + raise ValueError( + "{string} is not a correct version : should be X.Y[.Z].".format( + string=string + ) + ) from exc + + def check_require_version(f): + current = sys.version_info[:3] + if parse(minver, "0") < current <= parse(maxver, "4"): + return f + + str_version = ".".join(str(v) for v in sys.version_info) + + @functools.wraps(f) + def new_f(self, *args, **kwargs): + if minver is not None: + self.skipTest( + "Needs Python > %s. Current version is %s." % (minver, str_version) + ) + elif maxver is not None: + self.skipTest( + "Needs Python <= %s. Current version is %s." % (maxver, str_version) + ) + + return new_f + + return check_require_version + + +def get_name_node(start_from, name, index=0): + return [n for n in start_from.nodes_of_class(nodes.Name) if n.name == name][index] + + +@contextlib.contextmanager +def enable_warning(warning): + warnings.simplefilter("always", warning) + try: + yield + finally: + # Reset it to default value, so it will take + # into account the values from the -W flag. + warnings.simplefilter("default", warning) diff --git a/venv/lib/python3.7/site-packages/astroid/transforms.py b/venv/lib/python3.7/site-packages/astroid/transforms.py new file mode 100644 index 0000000..e5506cc --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/transforms.py @@ -0,0 +1,90 @@ +# Copyright (c) 2015-2016, 2018 Claudiu Popa +# Copyright (c) 2016 Ceridwen +# Copyright (c) 2018 Nick Drozd + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + + +import collections +from functools import lru_cache + + +class TransformVisitor: + """A visitor for handling transforms. + + The standard approach of using it is to call + :meth:`~visit` with an *astroid* module and the class + will take care of the rest, walking the tree and running the + transforms for each encountered node. + """ + + TRANSFORM_MAX_CACHE_SIZE = 10000 + + def __init__(self): + self.transforms = collections.defaultdict(list) + + @lru_cache(maxsize=TRANSFORM_MAX_CACHE_SIZE) + def _transform(self, node): + """Call matching transforms for the given node if any and return the + transformed node. + """ + cls = node.__class__ + if cls not in self.transforms: + # no transform registered for this class of node + return node + + transforms = self.transforms[cls] + for transform_func, predicate in transforms: + if predicate is None or predicate(node): + ret = transform_func(node) + # if the transformation function returns something, it's + # expected to be a replacement for the node + if ret is not None: + node = ret + if ret.__class__ != cls: + # Can no longer apply the rest of the transforms. + break + return node + + def _visit(self, node): + if hasattr(node, "_astroid_fields"): + for name in node._astroid_fields: + value = getattr(node, name) + visited = self._visit_generic(value) + if visited != value: + setattr(node, name, visited) + return self._transform(node) + + def _visit_generic(self, node): + if isinstance(node, list): + return [self._visit_generic(child) for child in node] + if isinstance(node, tuple): + return tuple(self._visit_generic(child) for child in node) + if not node or isinstance(node, str): + return node + + return self._visit(node) + + def register_transform(self, node_class, transform, predicate=None): + """Register `transform(node)` function to be applied on the given + astroid's `node_class` if `predicate` is None or returns true + when called with the node as argument. + + The transform function may return a value which is then used to + substitute the original node in the tree. + """ + self.transforms[node_class].append((transform, predicate)) + + def unregister_transform(self, node_class, transform, predicate=None): + """Unregister the given transform.""" + self.transforms[node_class].remove((transform, predicate)) + + def visit(self, module): + """Walk the given astroid *tree* and transform each encountered node + + Only the nodes which have transforms registered will actually + be replaced or changed. + """ + module.body = [self._visit(child) for child in module.body] + return self._transform(module) diff --git a/venv/lib/python3.7/site-packages/astroid/util.py b/venv/lib/python3.7/site-packages/astroid/util.py new file mode 100644 index 0000000..3ab7561 --- /dev/null +++ b/venv/lib/python3.7/site-packages/astroid/util.py @@ -0,0 +1,164 @@ +# Copyright (c) 2015-2018 Claudiu Popa +# Copyright (c) 2015-2016 Ceridwen +# Copyright (c) 2018 Bryce Guinta +# Copyright (c) 2018 Nick Drozd + +# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html +# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER + +import warnings +from itertools import islice + +import importlib +import lazy_object_proxy + + +def lazy_descriptor(obj): + class DescriptorProxy(lazy_object_proxy.Proxy): + def __get__(self, instance, owner=None): + return self.__class__.__get__(self, instance) + + return DescriptorProxy(obj) + + +def lazy_import(module_name): + return lazy_object_proxy.Proxy( + lambda: importlib.import_module("." + module_name, "astroid") + ) + + +@object.__new__ +class Uninferable: + """Special inference object, which is returned when inference fails.""" + + def __repr__(self): + return "Uninferable" + + __str__ = __repr__ + + def __getattribute__(self, name): + if name == "next": + raise AttributeError("next method should not be called") + if name.startswith("__") and name.endswith("__"): + return object.__getattribute__(self, name) + if name == "accept": + return object.__getattribute__(self, name) + return self + + def __call__(self, *args, **kwargs): + return self + + def __bool__(self): + return False + + __nonzero__ = __bool__ + + def accept(self, visitor): + func = getattr(visitor, "visit_uninferable") + return func(self) + + +class BadOperationMessage: + """Object which describes a TypeError occurred somewhere in the inference chain + + This is not an exception, but a container object which holds the types and + the error which occurred. + """ + + +class BadUnaryOperationMessage(BadOperationMessage): + """Object which describes operational failures on UnaryOps.""" + + def __init__(self, operand, op, error): + self.operand = operand + self.op = op + self.error = error + + @property + def _object_type_helper(self): + helpers = lazy_import("helpers") + return helpers.object_type + + def _object_type(self, obj): + # pylint: disable=not-callable; can't infer lazy_import + objtype = self._object_type_helper(obj) + if objtype is Uninferable: + return None + + return objtype + + def __str__(self): + if hasattr(self.operand, "name"): + operand_type = self.operand.name + else: + object_type = self._object_type(self.operand) + if hasattr(object_type, "name"): + operand_type = object_type.name + else: + # Just fallback to as_string + operand_type = object_type.as_string() + + msg = "bad operand type for unary {}: {}" + return msg.format(self.op, operand_type) + + +class BadBinaryOperationMessage(BadOperationMessage): + """Object which describes type errors for BinOps.""" + + def __init__(self, left_type, op, right_type): + self.left_type = left_type + self.right_type = right_type + self.op = op + + def __str__(self): + msg = "unsupported operand type(s) for {}: {!r} and {!r}" + return msg.format(self.op, self.left_type.name, self.right_type.name) + + +def _instancecheck(cls, other): + wrapped = cls.__wrapped__ + other_cls = other.__class__ + is_instance_of = wrapped is other_cls or issubclass(other_cls, wrapped) + warnings.warn( + "%r is deprecated and slated for removal in astroid " + "2.0, use %r instead" % (cls.__class__.__name__, wrapped.__name__), + PendingDeprecationWarning, + stacklevel=2, + ) + return is_instance_of + + +def proxy_alias(alias_name, node_type): + """Get a Proxy from the given name to the given node type.""" + proxy = type( + alias_name, + (lazy_object_proxy.Proxy,), + { + "__class__": object.__dict__["__class__"], + "__instancecheck__": _instancecheck, + }, + ) + return proxy(lambda: node_type) + + +def limit_inference(iterator, size): + """Limit inference amount. + + Limit inference amount to help with performance issues with + exponentially exploding possible results. + + :param iterator: Inference generator to limit + :type iterator: Iterator(NodeNG) + + :param size: Maximum mount of nodes yielded plus an + Uninferable at the end if limit reached + :type size: int + + :yields: A possibly modified generator + :rtype param: Iterable + """ + yield from islice(iterator, size) + has_more = next(iterator, False) + if has_more is not False: + yield Uninferable + return diff --git a/venv/lib/python3.7/site-packages/click/__init__.py b/venv/lib/python3.7/site-packages/click/__init__.py new file mode 100644 index 0000000..d3c3366 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/__init__.py @@ -0,0 +1,97 @@ +# -*- coding: utf-8 -*- +""" +click +~~~~~ + +Click is a simple Python module inspired by the stdlib optparse to make +writing command line scripts fun. Unlike other modules, it's based +around a simple API that does not come with too much magic and is +composable. + +:copyright: © 2014 by the Pallets team. +:license: BSD, see LICENSE.rst for more details. +""" + +# Core classes +from .core import Context, BaseCommand, Command, MultiCommand, Group, \ + CommandCollection, Parameter, Option, Argument + +# Globals +from .globals import get_current_context + +# Decorators +from .decorators import pass_context, pass_obj, make_pass_decorator, \ + command, group, argument, option, confirmation_option, \ + password_option, version_option, help_option + +# Types +from .types import ParamType, File, Path, Choice, IntRange, Tuple, \ + DateTime, STRING, INT, FLOAT, BOOL, UUID, UNPROCESSED, FloatRange + +# Utilities +from .utils import echo, get_binary_stream, get_text_stream, open_file, \ + format_filename, get_app_dir, get_os_args + +# Terminal functions +from .termui import prompt, confirm, get_terminal_size, echo_via_pager, \ + progressbar, clear, style, unstyle, secho, edit, launch, getchar, \ + pause + +# Exceptions +from .exceptions import ClickException, UsageError, BadParameter, \ + FileError, Abort, NoSuchOption, BadOptionUsage, BadArgumentUsage, \ + MissingParameter + +# Formatting +from .formatting import HelpFormatter, wrap_text + +# Parsing +from .parser import OptionParser + + +__all__ = [ + # Core classes + 'Context', 'BaseCommand', 'Command', 'MultiCommand', 'Group', + 'CommandCollection', 'Parameter', 'Option', 'Argument', + + # Globals + 'get_current_context', + + # Decorators + 'pass_context', 'pass_obj', 'make_pass_decorator', 'command', 'group', + 'argument', 'option', 'confirmation_option', 'password_option', + 'version_option', 'help_option', + + # Types + 'ParamType', 'File', 'Path', 'Choice', 'IntRange', 'Tuple', + 'DateTime', 'STRING', 'INT', 'FLOAT', 'BOOL', 'UUID', 'UNPROCESSED', + 'FloatRange', + + # Utilities + 'echo', 'get_binary_stream', 'get_text_stream', 'open_file', + 'format_filename', 'get_app_dir', 'get_os_args', + + # Terminal functions + 'prompt', 'confirm', 'get_terminal_size', 'echo_via_pager', + 'progressbar', 'clear', 'style', 'unstyle', 'secho', 'edit', 'launch', + 'getchar', 'pause', + + # Exceptions + 'ClickException', 'UsageError', 'BadParameter', 'FileError', + 'Abort', 'NoSuchOption', 'BadOptionUsage', 'BadArgumentUsage', + 'MissingParameter', + + # Formatting + 'HelpFormatter', 'wrap_text', + + # Parsing + 'OptionParser', +] + + +# Controls if click should emit the warning about the use of unicode +# literals. +disable_unicode_literals_warning = False + + +__version__ = '7.0' diff --git a/venv/lib/python3.7/site-packages/click/__pycache__/__init__.cpython-37.pyc b/venv/lib/python3.7/site-packages/click/__pycache__/__init__.cpython-37.pyc new file mode 100644 index 0000000..a990939 Binary files /dev/null and b/venv/lib/python3.7/site-packages/click/__pycache__/__init__.cpython-37.pyc differ diff --git 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a/venv/lib/python3.7/site-packages/click/__pycache__/utils.cpython-37.pyc b/venv/lib/python3.7/site-packages/click/__pycache__/utils.cpython-37.pyc new file mode 100644 index 0000000..96f6d87 Binary files /dev/null and b/venv/lib/python3.7/site-packages/click/__pycache__/utils.cpython-37.pyc differ diff --git a/venv/lib/python3.7/site-packages/click/_bashcomplete.py b/venv/lib/python3.7/site-packages/click/_bashcomplete.py new file mode 100644 index 0000000..a5f1084 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/_bashcomplete.py @@ -0,0 +1,293 @@ +import copy +import os +import re + +from .utils import echo +from .parser import split_arg_string +from .core import MultiCommand, Option, Argument +from .types import Choice + +try: + from collections import abc +except ImportError: + import collections as abc + +WORDBREAK = '=' + +# Note, only BASH version 4.4 and later have the nosort option. +COMPLETION_SCRIPT_BASH = ''' +%(complete_func)s() { + local IFS=$'\n' + COMPREPLY=( $( env COMP_WORDS="${COMP_WORDS[*]}" \\ + COMP_CWORD=$COMP_CWORD \\ + %(autocomplete_var)s=complete $1 ) ) + return 0 +} + +%(complete_func)setup() { + local COMPLETION_OPTIONS="" + local BASH_VERSION_ARR=(${BASH_VERSION//./ }) + # Only BASH version 4.4 and later have the nosort option. + if [ ${BASH_VERSION_ARR[0]} -gt 4 ] || ([ ${BASH_VERSION_ARR[0]} -eq 4 ] && [ ${BASH_VERSION_ARR[1]} -ge 4 ]); then + COMPLETION_OPTIONS="-o nosort" + fi + + complete $COMPLETION_OPTIONS -F %(complete_func)s %(script_names)s +} + +%(complete_func)setup +''' + +COMPLETION_SCRIPT_ZSH = ''' +%(complete_func)s() { + local -a completions + local -a completions_with_descriptions + local -a response + response=("${(@f)$( env COMP_WORDS=\"${words[*]}\" \\ + COMP_CWORD=$((CURRENT-1)) \\ + %(autocomplete_var)s=\"complete_zsh\" \\ + %(script_names)s )}") + + for key descr in ${(kv)response}; do + if [[ "$descr" == "_" ]]; then + completions+=("$key") + else + completions_with_descriptions+=("$key":"$descr") + fi + done + + if [ -n "$completions_with_descriptions" ]; then + _describe -V unsorted completions_with_descriptions -U -Q + fi + + if [ -n "$completions" ]; then + compadd -U -V unsorted -Q -a completions + fi + compstate[insert]="automenu" +} + +compdef %(complete_func)s %(script_names)s +''' + +_invalid_ident_char_re = re.compile(r'[^a-zA-Z0-9_]') + + +def get_completion_script(prog_name, complete_var, shell): + cf_name = _invalid_ident_char_re.sub('', prog_name.replace('-', '_')) + script = COMPLETION_SCRIPT_ZSH if shell == 'zsh' else COMPLETION_SCRIPT_BASH + return (script % { + 'complete_func': '_%s_completion' % cf_name, + 'script_names': prog_name, + 'autocomplete_var': complete_var, + }).strip() + ';' + + +def resolve_ctx(cli, prog_name, args): + """ + Parse into a hierarchy of contexts. Contexts are connected through the parent variable. + :param cli: command definition + :param prog_name: the program that is running + :param args: full list of args + :return: the final context/command parsed + """ + ctx = cli.make_context(prog_name, args, resilient_parsing=True) + args = ctx.protected_args + ctx.args + while args: + if isinstance(ctx.command, MultiCommand): + if not ctx.command.chain: + cmd_name, cmd, args = ctx.command.resolve_command(ctx, args) + if cmd is None: + return ctx + ctx = cmd.make_context(cmd_name, args, parent=ctx, + resilient_parsing=True) + args = ctx.protected_args + ctx.args + else: + # Walk chained subcommand contexts saving the last one. + while args: + cmd_name, cmd, args = ctx.command.resolve_command(ctx, args) + if cmd is None: + return ctx + sub_ctx = cmd.make_context(cmd_name, args, parent=ctx, + allow_extra_args=True, + allow_interspersed_args=False, + resilient_parsing=True) + args = sub_ctx.args + ctx = sub_ctx + args = sub_ctx.protected_args + sub_ctx.args + else: + break + return ctx + + +def start_of_option(param_str): + """ + :param param_str: param_str to check + :return: whether or not this is the start of an option declaration (i.e. starts "-" or "--") + """ + return param_str and param_str[:1] == '-' + + +def is_incomplete_option(all_args, cmd_param): + """ + :param all_args: the full original list of args supplied + :param cmd_param: the current command paramter + :return: whether or not the last option declaration (i.e. starts "-" or "--") is incomplete and + corresponds to this cmd_param. In other words whether this cmd_param option can still accept + values + """ + if not isinstance(cmd_param, Option): + return False + if cmd_param.is_flag: + return False + last_option = None + for index, arg_str in enumerate(reversed([arg for arg in all_args if arg != WORDBREAK])): + if index + 1 > cmd_param.nargs: + break + if start_of_option(arg_str): + last_option = arg_str + + return True if last_option and last_option in cmd_param.opts else False + + +def is_incomplete_argument(current_params, cmd_param): + """ + :param current_params: the current params and values for this argument as already entered + :param cmd_param: the current command parameter + :return: whether or not the last argument is incomplete and corresponds to this cmd_param. In + other words whether or not the this cmd_param argument can still accept values + """ + if not isinstance(cmd_param, Argument): + return False + current_param_values = current_params[cmd_param.name] + if current_param_values is None: + return True + if cmd_param.nargs == -1: + return True + if isinstance(current_param_values, abc.Iterable) \ + and cmd_param.nargs > 1 and len(current_param_values) < cmd_param.nargs: + return True + return False + + +def get_user_autocompletions(ctx, args, incomplete, cmd_param): + """ + :param ctx: context associated with the parsed command + :param args: full list of args + :param incomplete: the incomplete text to autocomplete + :param cmd_param: command definition + :return: all the possible user-specified completions for the param + """ + results = [] + if isinstance(cmd_param.type, Choice): + # Choices don't support descriptions. + results = [(c, None) + for c in cmd_param.type.choices if str(c).startswith(incomplete)] + elif cmd_param.autocompletion is not None: + dynamic_completions = cmd_param.autocompletion(ctx=ctx, + args=args, + incomplete=incomplete) + results = [c if isinstance(c, tuple) else (c, None) + for c in dynamic_completions] + return results + + +def get_visible_commands_starting_with(ctx, starts_with): + """ + :param ctx: context associated with the parsed command + :starts_with: string that visible commands must start with. + :return: all visible (not hidden) commands that start with starts_with. + """ + for c in ctx.command.list_commands(ctx): + if c.startswith(starts_with): + command = ctx.command.get_command(ctx, c) + if not command.hidden: + yield command + + +def add_subcommand_completions(ctx, incomplete, completions_out): + # Add subcommand completions. + if isinstance(ctx.command, MultiCommand): + completions_out.extend( + [(c.name, c.get_short_help_str()) for c in get_visible_commands_starting_with(ctx, incomplete)]) + + # Walk up the context list and add any other completion possibilities from chained commands + while ctx.parent is not None: + ctx = ctx.parent + if isinstance(ctx.command, MultiCommand) and ctx.command.chain: + remaining_commands = [c for c in get_visible_commands_starting_with(ctx, incomplete) + if c.name not in ctx.protected_args] + completions_out.extend([(c.name, c.get_short_help_str()) for c in remaining_commands]) + + +def get_choices(cli, prog_name, args, incomplete): + """ + :param cli: command definition + :param prog_name: the program that is running + :param args: full list of args + :param incomplete: the incomplete text to autocomplete + :return: all the possible completions for the incomplete + """ + all_args = copy.deepcopy(args) + + ctx = resolve_ctx(cli, prog_name, args) + if ctx is None: + return [] + + # In newer versions of bash long opts with '='s are partitioned, but it's easier to parse + # without the '=' + if start_of_option(incomplete) and WORDBREAK in incomplete: + partition_incomplete = incomplete.partition(WORDBREAK) + all_args.append(partition_incomplete[0]) + incomplete = partition_incomplete[2] + elif incomplete == WORDBREAK: + incomplete = '' + + completions = [] + if start_of_option(incomplete): + # completions for partial options + for param in ctx.command.params: + if isinstance(param, Option) and not param.hidden: + param_opts = [param_opt for param_opt in param.opts + + param.secondary_opts if param_opt not in all_args or param.multiple] + completions.extend([(o, param.help) for o in param_opts if o.startswith(incomplete)]) + return completions + # completion for option values from user supplied values + for param in ctx.command.params: + if is_incomplete_option(all_args, param): + return get_user_autocompletions(ctx, all_args, incomplete, param) + # completion for argument values from user supplied values + for param in ctx.command.params: + if is_incomplete_argument(ctx.params, param): + return get_user_autocompletions(ctx, all_args, incomplete, param) + + add_subcommand_completions(ctx, incomplete, completions) + # Sort before returning so that proper ordering can be enforced in custom types. + return sorted(completions) + + +def do_complete(cli, prog_name, include_descriptions): + cwords = split_arg_string(os.environ['COMP_WORDS']) + cword = int(os.environ['COMP_CWORD']) + args = cwords[1:cword] + try: + incomplete = cwords[cword] + except IndexError: + incomplete = '' + + for item in get_choices(cli, prog_name, args, incomplete): + echo(item[0]) + if include_descriptions: + # ZSH has trouble dealing with empty array parameters when returned from commands, so use a well defined character '_' to indicate no description is present. + echo(item[1] if item[1] else '_') + + return True + + +def bashcomplete(cli, prog_name, complete_var, complete_instr): + if complete_instr.startswith('source'): + shell = 'zsh' if complete_instr == 'source_zsh' else 'bash' + echo(get_completion_script(prog_name, complete_var, shell)) + return True + elif complete_instr == 'complete' or complete_instr == 'complete_zsh': + return do_complete(cli, prog_name, complete_instr == 'complete_zsh') + return False diff --git a/venv/lib/python3.7/site-packages/click/_compat.py b/venv/lib/python3.7/site-packages/click/_compat.py new file mode 100644 index 0000000..937e230 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/_compat.py @@ -0,0 +1,703 @@ +import re +import io +import os +import sys +import codecs +from weakref import WeakKeyDictionary + + +PY2 = sys.version_info[0] == 2 +CYGWIN = sys.platform.startswith('cygwin') +# Determine local App Engine environment, per Google's own suggestion +APP_ENGINE = ('APPENGINE_RUNTIME' in os.environ and + 'Development/' in os.environ['SERVER_SOFTWARE']) +WIN = sys.platform.startswith('win') and not APP_ENGINE +DEFAULT_COLUMNS = 80 + + +_ansi_re = re.compile(r'\033\[((?:\d|;)*)([a-zA-Z])') + + +def get_filesystem_encoding(): + return sys.getfilesystemencoding() or sys.getdefaultencoding() + + +def _make_text_stream(stream, encoding, errors, + force_readable=False, force_writable=False): + if encoding is None: + encoding = get_best_encoding(stream) + if errors is None: + errors = 'replace' + return _NonClosingTextIOWrapper(stream, encoding, errors, + line_buffering=True, + force_readable=force_readable, + force_writable=force_writable) + + +def is_ascii_encoding(encoding): + """Checks if a given encoding is ascii.""" + try: + return codecs.lookup(encoding).name == 'ascii' + except LookupError: + return False + + +def get_best_encoding(stream): + """Returns the default stream encoding if not found.""" + rv = getattr(stream, 'encoding', None) or sys.getdefaultencoding() + if is_ascii_encoding(rv): + return 'utf-8' + return rv + + +class _NonClosingTextIOWrapper(io.TextIOWrapper): + + def __init__(self, stream, encoding, errors, + force_readable=False, force_writable=False, **extra): + self._stream = stream = _FixupStream(stream, force_readable, + force_writable) + io.TextIOWrapper.__init__(self, stream, encoding, errors, **extra) + + # The io module is a place where the Python 3 text behavior + # was forced upon Python 2, so we need to unbreak + # it to look like Python 2. + if PY2: + def write(self, x): + if isinstance(x, str) or is_bytes(x): + try: + self.flush() + except Exception: + pass + return self.buffer.write(str(x)) + return io.TextIOWrapper.write(self, x) + + def writelines(self, lines): + for line in lines: + self.write(line) + + def __del__(self): + try: + self.detach() + except Exception: + pass + + def isatty(self): + # https://bitbucket.org/pypy/pypy/issue/1803 + return self._stream.isatty() + + +class _FixupStream(object): + """The new io interface needs more from streams than streams + traditionally implement. As such, this fix-up code is necessary in + some circumstances. + + The forcing of readable and writable flags are there because some tools + put badly patched objects on sys (one such offender are certain version + of jupyter notebook). + """ + + def __init__(self, stream, force_readable=False, force_writable=False): + self._stream = stream + self._force_readable = force_readable + self._force_writable = force_writable + + def __getattr__(self, name): + return getattr(self._stream, name) + + def read1(self, size): + f = getattr(self._stream, 'read1', None) + if f is not None: + return f(size) + # We only dispatch to readline instead of read in Python 2 as we + # do not want cause problems with the different implementation + # of line buffering. + if PY2: + return self._stream.readline(size) + return self._stream.read(size) + + def readable(self): + if self._force_readable: + return True + x = getattr(self._stream, 'readable', None) + if x is not None: + return x() + try: + self._stream.read(0) + except Exception: + return False + return True + + def writable(self): + if self._force_writable: + return True + x = getattr(self._stream, 'writable', None) + if x is not None: + return x() + try: + self._stream.write('') + except Exception: + try: + self._stream.write(b'') + except Exception: + return False + return True + + def seekable(self): + x = getattr(self._stream, 'seekable', None) + if x is not None: + return x() + try: + self._stream.seek(self._stream.tell()) + except Exception: + return False + return True + + +if PY2: + text_type = unicode + bytes = str + raw_input = raw_input + string_types = (str, unicode) + int_types = (int, long) + iteritems = lambda x: x.iteritems() + range_type = xrange + + def is_bytes(x): + return isinstance(x, (buffer, bytearray)) + + _identifier_re = re.compile(r'^[a-zA-Z_][a-zA-Z0-9_]*$') + + # For Windows, we need to force stdout/stdin/stderr to binary if it's + # fetched for that. This obviously is not the most correct way to do + # it as it changes global state. Unfortunately, there does not seem to + # be a clear better way to do it as just reopening the file in binary + # mode does not change anything. + # + # An option would be to do what Python 3 does and to open the file as + # binary only, patch it back to the system, and then use a wrapper + # stream that converts newlines. It's not quite clear what's the + # correct option here. + # + # This code also lives in _winconsole for the fallback to the console + # emulation stream. + # + # There are also Windows environments where the `msvcrt` module is not + # available (which is why we use try-catch instead of the WIN variable + # here), such as the Google App Engine development server on Windows. In + # those cases there is just nothing we can do. + def set_binary_mode(f): + return f + + try: + import msvcrt + except ImportError: + pass + else: + def set_binary_mode(f): + try: + fileno = f.fileno() + except Exception: + pass + else: + msvcrt.setmode(fileno, os.O_BINARY) + return f + + try: + import fcntl + except ImportError: + pass + else: + def set_binary_mode(f): + try: + fileno = f.fileno() + except Exception: + pass + else: + flags = fcntl.fcntl(fileno, fcntl.F_GETFL) + fcntl.fcntl(fileno, fcntl.F_SETFL, flags & ~os.O_NONBLOCK) + return f + + def isidentifier(x): + return _identifier_re.search(x) is not None + + def get_binary_stdin(): + return set_binary_mode(sys.stdin) + + def get_binary_stdout(): + _wrap_std_stream('stdout') + return set_binary_mode(sys.stdout) + + def get_binary_stderr(): + _wrap_std_stream('stderr') + return set_binary_mode(sys.stderr) + + def get_text_stdin(encoding=None, errors=None): + rv = _get_windows_console_stream(sys.stdin, encoding, errors) + if rv is not None: + return rv + return _make_text_stream(sys.stdin, encoding, errors, + force_readable=True) + + def get_text_stdout(encoding=None, errors=None): + _wrap_std_stream('stdout') + rv = _get_windows_console_stream(sys.stdout, encoding, errors) + if rv is not None: + return rv + return _make_text_stream(sys.stdout, encoding, errors, + force_writable=True) + + def get_text_stderr(encoding=None, errors=None): + _wrap_std_stream('stderr') + rv = _get_windows_console_stream(sys.stderr, encoding, errors) + if rv is not None: + return rv + return _make_text_stream(sys.stderr, encoding, errors, + force_writable=True) + + def filename_to_ui(value): + if isinstance(value, bytes): + value = value.decode(get_filesystem_encoding(), 'replace') + return value +else: + import io + text_type = str + raw_input = input + string_types = (str,) + int_types = (int,) + range_type = range + isidentifier = lambda x: x.isidentifier() + iteritems = lambda x: iter(x.items()) + + def is_bytes(x): + return isinstance(x, (bytes, memoryview, bytearray)) + + def _is_binary_reader(stream, default=False): + try: + return isinstance(stream.read(0), bytes) + except Exception: + return default + # This happens in some cases where the stream was already + # closed. In this case, we assume the default. + + def _is_binary_writer(stream, default=False): + try: + stream.write(b'') + except Exception: + try: + stream.write('') + return False + except Exception: + pass + return default + return True + + def _find_binary_reader(stream): + # We need to figure out if the given stream is already binary. + # This can happen because the official docs recommend detaching + # the streams to get binary streams. Some code might do this, so + # we need to deal with this case explicitly. + if _is_binary_reader(stream, False): + return stream + + buf = getattr(stream, 'buffer', None) + + # Same situation here; this time we assume that the buffer is + # actually binary in case it's closed. + if buf is not None and _is_binary_reader(buf, True): + return buf + + def _find_binary_writer(stream): + # We need to figure out if the given stream is already binary. + # This can happen because the official docs recommend detatching + # the streams to get binary streams. Some code might do this, so + # we need to deal with this case explicitly. + if _is_binary_writer(stream, False): + return stream + + buf = getattr(stream, 'buffer', None) + + # Same situation here; this time we assume that the buffer is + # actually binary in case it's closed. + if buf is not None and _is_binary_writer(buf, True): + return buf + + def _stream_is_misconfigured(stream): + """A stream is misconfigured if its encoding is ASCII.""" + # If the stream does not have an encoding set, we assume it's set + # to ASCII. This appears to happen in certain unittest + # environments. It's not quite clear what the correct behavior is + # but this at least will force Click to recover somehow. + return is_ascii_encoding(getattr(stream, 'encoding', None) or 'ascii') + + def _is_compatible_text_stream(stream, encoding, errors): + stream_encoding = getattr(stream, 'encoding', None) + stream_errors = getattr(stream, 'errors', None) + + # Perfect match. + if stream_encoding == encoding and stream_errors == errors: + return True + + # Otherwise, it's only a compatible stream if we did not ask for + # an encoding. + if encoding is None: + return stream_encoding is not None + + return False + + def _force_correct_text_reader(text_reader, encoding, errors, + force_readable=False): + if _is_binary_reader(text_reader, False): + binary_reader = text_reader + else: + # If there is no target encoding set, we need to verify that the + # reader is not actually misconfigured. + if encoding is None and not _stream_is_misconfigured(text_reader): + return text_reader + + if _is_compatible_text_stream(text_reader, encoding, errors): + return text_reader + + # If the reader has no encoding, we try to find the underlying + # binary reader for it. If that fails because the environment is + # misconfigured, we silently go with the same reader because this + # is too common to happen. In that case, mojibake is better than + # exceptions. + binary_reader = _find_binary_reader(text_reader) + if binary_reader is None: + return text_reader + + # At this point, we default the errors to replace instead of strict + # because nobody handles those errors anyways and at this point + # we're so fundamentally fucked that nothing can repair it. + if errors is None: + errors = 'replace' + return _make_text_stream(binary_reader, encoding, errors, + force_readable=force_readable) + + def _force_correct_text_writer(text_writer, encoding, errors, + force_writable=False): + if _is_binary_writer(text_writer, False): + binary_writer = text_writer + else: + # If there is no target encoding set, we need to verify that the + # writer is not actually misconfigured. + if encoding is None and not _stream_is_misconfigured(text_writer): + return text_writer + + if _is_compatible_text_stream(text_writer, encoding, errors): + return text_writer + + # If the writer has no encoding, we try to find the underlying + # binary writer for it. If that fails because the environment is + # misconfigured, we silently go with the same writer because this + # is too common to happen. In that case, mojibake is better than + # exceptions. + binary_writer = _find_binary_writer(text_writer) + if binary_writer is None: + return text_writer + + # At this point, we default the errors to replace instead of strict + # because nobody handles those errors anyways and at this point + # we're so fundamentally fucked that nothing can repair it. + if errors is None: + errors = 'replace' + return _make_text_stream(binary_writer, encoding, errors, + force_writable=force_writable) + + def get_binary_stdin(): + reader = _find_binary_reader(sys.stdin) + if reader is None: + raise RuntimeError('Was not able to determine binary ' + 'stream for sys.stdin.') + return reader + + def get_binary_stdout(): + writer = _find_binary_writer(sys.stdout) + if writer is None: + raise RuntimeError('Was not able to determine binary ' + 'stream for sys.stdout.') + return writer + + def get_binary_stderr(): + writer = _find_binary_writer(sys.stderr) + if writer is None: + raise RuntimeError('Was not able to determine binary ' + 'stream for sys.stderr.') + return writer + + def get_text_stdin(encoding=None, errors=None): + rv = _get_windows_console_stream(sys.stdin, encoding, errors) + if rv is not None: + return rv + return _force_correct_text_reader(sys.stdin, encoding, errors, + force_readable=True) + + def get_text_stdout(encoding=None, errors=None): + rv = _get_windows_console_stream(sys.stdout, encoding, errors) + if rv is not None: + return rv + return _force_correct_text_writer(sys.stdout, encoding, errors, + force_writable=True) + + def get_text_stderr(encoding=None, errors=None): + rv = _get_windows_console_stream(sys.stderr, encoding, errors) + if rv is not None: + return rv + return _force_correct_text_writer(sys.stderr, encoding, errors, + force_writable=True) + + def filename_to_ui(value): + if isinstance(value, bytes): + value = value.decode(get_filesystem_encoding(), 'replace') + else: + value = value.encode('utf-8', 'surrogateescape') \ + .decode('utf-8', 'replace') + return value + + +def get_streerror(e, default=None): + if hasattr(e, 'strerror'): + msg = e.strerror + else: + if default is not None: + msg = default + else: + msg = str(e) + if isinstance(msg, bytes): + msg = msg.decode('utf-8', 'replace') + return msg + + +def open_stream(filename, mode='r', encoding=None, errors='strict', + atomic=False): + # Standard streams first. These are simple because they don't need + # special handling for the atomic flag. It's entirely ignored. + if filename == '-': + if any(m in mode for m in ['w', 'a', 'x']): + if 'b' in mode: + return get_binary_stdout(), False + return get_text_stdout(encoding=encoding, errors=errors), False + if 'b' in mode: + return get_binary_stdin(), False + return get_text_stdin(encoding=encoding, errors=errors), False + + # Non-atomic writes directly go out through the regular open functions. + if not atomic: + if encoding is None: + return open(filename, mode), True + return io.open(filename, mode, encoding=encoding, errors=errors), True + + # Some usability stuff for atomic writes + if 'a' in mode: + raise ValueError( + 'Appending to an existing file is not supported, because that ' + 'would involve an expensive `copy`-operation to a temporary ' + 'file. Open the file in normal `w`-mode and copy explicitly ' + 'if that\'s what you\'re after.' + ) + if 'x' in mode: + raise ValueError('Use the `overwrite`-parameter instead.') + if 'w' not in mode: + raise ValueError('Atomic writes only make sense with `w`-mode.') + + # Atomic writes are more complicated. They work by opening a file + # as a proxy in the same folder and then using the fdopen + # functionality to wrap it in a Python file. Then we wrap it in an + # atomic file that moves the file over on close. + import tempfile + fd, tmp_filename = tempfile.mkstemp(dir=os.path.dirname(filename), + prefix='.__atomic-write') + + if encoding is not None: + f = io.open(fd, mode, encoding=encoding, errors=errors) + else: + f = os.fdopen(fd, mode) + + return _AtomicFile(f, tmp_filename, os.path.realpath(filename)), True + + +# Used in a destructor call, needs extra protection from interpreter cleanup. +if hasattr(os, 'replace'): + _replace = os.replace + _can_replace = True +else: + _replace = os.rename + _can_replace = not WIN + + +class _AtomicFile(object): + + def __init__(self, f, tmp_filename, real_filename): + self._f = f + self._tmp_filename = tmp_filename + self._real_filename = real_filename + self.closed = False + + @property + def name(self): + return self._real_filename + + def close(self, delete=False): + if self.closed: + return + self._f.close() + if not _can_replace: + try: + os.remove(self._real_filename) + except OSError: + pass + _replace(self._tmp_filename, self._real_filename) + self.closed = True + + def __getattr__(self, name): + return getattr(self._f, name) + + def __enter__(self): + return self + + def __exit__(self, exc_type, exc_value, tb): + self.close(delete=exc_type is not None) + + def __repr__(self): + return repr(self._f) + + +auto_wrap_for_ansi = None +colorama = None +get_winterm_size = None + + +def strip_ansi(value): + return _ansi_re.sub('', value) + + +def should_strip_ansi(stream=None, color=None): + if color is None: + if stream is None: + stream = sys.stdin + return not isatty(stream) + return not color + + +# If we're on Windows, we provide transparent integration through +# colorama. This will make ANSI colors through the echo function +# work automatically. +if WIN: + # Windows has a smaller terminal + DEFAULT_COLUMNS = 79 + + from ._winconsole import _get_windows_console_stream, _wrap_std_stream + + def _get_argv_encoding(): + import locale + return locale.getpreferredencoding() + + if PY2: + def raw_input(prompt=''): + sys.stderr.flush() + if prompt: + stdout = _default_text_stdout() + stdout.write(prompt) + stdin = _default_text_stdin() + return stdin.readline().rstrip('\r\n') + + try: + import colorama + except ImportError: + pass + else: + _ansi_stream_wrappers = WeakKeyDictionary() + + def auto_wrap_for_ansi(stream, color=None): + """This function wraps a stream so that calls through colorama + are issued to the win32 console API to recolor on demand. It + also ensures to reset the colors if a write call is interrupted + to not destroy the console afterwards. + """ + try: + cached = _ansi_stream_wrappers.get(stream) + except Exception: + cached = None + if cached is not None: + return cached + strip = should_strip_ansi(stream, color) + ansi_wrapper = colorama.AnsiToWin32(stream, strip=strip) + rv = ansi_wrapper.stream + _write = rv.write + + def _safe_write(s): + try: + return _write(s) + except: + ansi_wrapper.reset_all() + raise + + rv.write = _safe_write + try: + _ansi_stream_wrappers[stream] = rv + except Exception: + pass + return rv + + def get_winterm_size(): + win = colorama.win32.GetConsoleScreenBufferInfo( + colorama.win32.STDOUT).srWindow + return win.Right - win.Left, win.Bottom - win.Top +else: + def _get_argv_encoding(): + return getattr(sys.stdin, 'encoding', None) or get_filesystem_encoding() + + _get_windows_console_stream = lambda *x: None + _wrap_std_stream = lambda *x: None + + +def term_len(x): + return len(strip_ansi(x)) + + +def isatty(stream): + try: + return stream.isatty() + except Exception: + return False + + +def _make_cached_stream_func(src_func, wrapper_func): + cache = WeakKeyDictionary() + def func(): + stream = src_func() + try: + rv = cache.get(stream) + except Exception: + rv = None + if rv is not None: + return rv + rv = wrapper_func() + try: + stream = src_func() # In case wrapper_func() modified the stream + cache[stream] = rv + except Exception: + pass + return rv + return func + + +_default_text_stdin = _make_cached_stream_func( + lambda: sys.stdin, get_text_stdin) +_default_text_stdout = _make_cached_stream_func( + lambda: sys.stdout, get_text_stdout) +_default_text_stderr = _make_cached_stream_func( + lambda: sys.stderr, get_text_stderr) + + +binary_streams = { + 'stdin': get_binary_stdin, + 'stdout': get_binary_stdout, + 'stderr': get_binary_stderr, +} + +text_streams = { + 'stdin': get_text_stdin, + 'stdout': get_text_stdout, + 'stderr': get_text_stderr, +} diff --git a/venv/lib/python3.7/site-packages/click/_termui_impl.py b/venv/lib/python3.7/site-packages/click/_termui_impl.py new file mode 100644 index 0000000..00a8e5e --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/_termui_impl.py @@ -0,0 +1,621 @@ +# -*- coding: utf-8 -*- +""" +click._termui_impl +~~~~~~~~~~~~~~~~~~ + +This module contains implementations for the termui module. To keep the +import time of Click down, some infrequently used functionality is +placed in this module and only imported as needed. + +:copyright: © 2014 by the Pallets team. +:license: BSD, see LICENSE.rst for more details. +""" + +import os +import sys +import time +import math +import contextlib +from ._compat import _default_text_stdout, range_type, PY2, isatty, \ + open_stream, strip_ansi, term_len, get_best_encoding, WIN, int_types, \ + CYGWIN +from .utils import echo +from .exceptions import ClickException + + +if os.name == 'nt': + BEFORE_BAR = '\r' + AFTER_BAR = '\n' +else: + BEFORE_BAR = '\r\033[?25l' + AFTER_BAR = '\033[?25h\n' + + +def _length_hint(obj): + """Returns the length hint of an object.""" + try: + return len(obj) + except (AttributeError, TypeError): + try: + get_hint = type(obj).__length_hint__ + except AttributeError: + return None + try: + hint = get_hint(obj) + except TypeError: + return None + if hint is NotImplemented or \ + not isinstance(hint, int_types) or \ + hint < 0: + return None + return hint + + +class ProgressBar(object): + + def __init__(self, iterable, length=None, fill_char='#', empty_char=' ', + bar_template='%(bar)s', info_sep=' ', show_eta=True, + show_percent=None, show_pos=False, item_show_func=None, + label=None, file=None, color=None, width=30): + self.fill_char = fill_char + self.empty_char = empty_char + self.bar_template = bar_template + self.info_sep = info_sep + self.show_eta = show_eta + self.show_percent = show_percent + self.show_pos = show_pos + self.item_show_func = item_show_func + self.label = label or '' + if file is None: + file = _default_text_stdout() + self.file = file + self.color = color + self.width = width + self.autowidth = width == 0 + + if length is None: + length = _length_hint(iterable) + if iterable is None: + if length is None: + raise TypeError('iterable or length is required') + iterable = range_type(length) + self.iter = iter(iterable) + self.length = length + self.length_known = length is not None + self.pos = 0 + self.avg = [] + self.start = self.last_eta = time.time() + self.eta_known = False + self.finished = False + self.max_width = None + self.entered = False + self.current_item = None + self.is_hidden = not isatty(self.file) + self._last_line = None + self.short_limit = 0.5 + + def __enter__(self): + self.entered = True + self.render_progress() + return self + + def __exit__(self, exc_type, exc_value, tb): + self.render_finish() + + def __iter__(self): + if not self.entered: + raise RuntimeError('You need to use progress bars in a with block.') + self.render_progress() + return self.generator() + + def is_fast(self): + return time.time() - self.start <= self.short_limit + + def render_finish(self): + if self.is_hidden or self.is_fast(): + return + self.file.write(AFTER_BAR) + self.file.flush() + + @property + def pct(self): + if self.finished: + return 1.0 + return min(self.pos / (float(self.length) or 1), 1.0) + + @property + def time_per_iteration(self): + if not self.avg: + return 0.0 + return sum(self.avg) / float(len(self.avg)) + + @property + def eta(self): + if self.length_known and not self.finished: + return self.time_per_iteration * (self.length - self.pos) + return 0.0 + + def format_eta(self): + if self.eta_known: + t = int(self.eta) + seconds = t % 60 + t //= 60 + minutes = t % 60 + t //= 60 + hours = t % 24 + t //= 24 + if t > 0: + days = t + return '%dd %02d:%02d:%02d' % (days, hours, minutes, seconds) + else: + return '%02d:%02d:%02d' % (hours, minutes, seconds) + return '' + + def format_pos(self): + pos = str(self.pos) + if self.length_known: + pos += '/%s' % self.length + return pos + + def format_pct(self): + return ('% 4d%%' % int(self.pct * 100))[1:] + + def format_bar(self): + if self.length_known: + bar_length = int(self.pct * self.width) + bar = self.fill_char * bar_length + bar += self.empty_char * (self.width - bar_length) + elif self.finished: + bar = self.fill_char * self.width + else: + bar = list(self.empty_char * (self.width or 1)) + if self.time_per_iteration != 0: + bar[int((math.cos(self.pos * self.time_per_iteration) + / 2.0 + 0.5) * self.width)] = self.fill_char + bar = ''.join(bar) + return bar + + def format_progress_line(self): + show_percent = self.show_percent + + info_bits = [] + if self.length_known and show_percent is None: + show_percent = not self.show_pos + + if self.show_pos: + info_bits.append(self.format_pos()) + if show_percent: + info_bits.append(self.format_pct()) + if self.show_eta and self.eta_known and not self.finished: + info_bits.append(self.format_eta()) + if self.item_show_func is not None: + item_info = self.item_show_func(self.current_item) + if item_info is not None: + info_bits.append(item_info) + + return (self.bar_template % { + 'label': self.label, + 'bar': self.format_bar(), + 'info': self.info_sep.join(info_bits) + }).rstrip() + + def render_progress(self): + from .termui import get_terminal_size + + if self.is_hidden: + return + + buf = [] + # Update width in case the terminal has been resized + if self.autowidth: + old_width = self.width + self.width = 0 + clutter_length = term_len(self.format_progress_line()) + new_width = max(0, get_terminal_size()[0] - clutter_length) + if new_width < old_width: + buf.append(BEFORE_BAR) + buf.append(' ' * self.max_width) + self.max_width = new_width + self.width = new_width + + clear_width = self.width + if self.max_width is not None: + clear_width = self.max_width + + buf.append(BEFORE_BAR) + line = self.format_progress_line() + line_len = term_len(line) + if self.max_width is None or self.max_width < line_len: + self.max_width = line_len + + buf.append(line) + buf.append(' ' * (clear_width - line_len)) + line = ''.join(buf) + # Render the line only if it changed. + + if line != self._last_line and not self.is_fast(): + self._last_line = line + echo(line, file=self.file, color=self.color, nl=False) + self.file.flush() + + def make_step(self, n_steps): + self.pos += n_steps + if self.length_known and self.pos >= self.length: + self.finished = True + + if (time.time() - self.last_eta) < 1.0: + return + + self.last_eta = time.time() + + # self.avg is a rolling list of length <= 7 of steps where steps are + # defined as time elapsed divided by the total progress through + # self.length. + if self.pos: + step = (time.time() - self.start) / self.pos + else: + step = time.time() - self.start + + self.avg = self.avg[-6:] + [step] + + self.eta_known = self.length_known + + def update(self, n_steps): + self.make_step(n_steps) + self.render_progress() + + def finish(self): + self.eta_known = 0 + self.current_item = None + self.finished = True + + def generator(self): + """ + Returns a generator which yields the items added to the bar during + construction, and updates the progress bar *after* the yielded block + returns. + """ + if not self.entered: + raise RuntimeError('You need to use progress bars in a with block.') + + if self.is_hidden: + for rv in self.iter: + yield rv + else: + for rv in self.iter: + self.current_item = rv + yield rv + self.update(1) + self.finish() + self.render_progress() + + +def pager(generator, color=None): + """Decide what method to use for paging through text.""" + stdout = _default_text_stdout() + if not isatty(sys.stdin) or not isatty(stdout): + return _nullpager(stdout, generator, color) + pager_cmd = (os.environ.get('PAGER', None) or '').strip() + if pager_cmd: + if WIN: + return _tempfilepager(generator, pager_cmd, color) + return _pipepager(generator, pager_cmd, color) + if os.environ.get('TERM') in ('dumb', 'emacs'): + return _nullpager(stdout, generator, color) + if WIN or sys.platform.startswith('os2'): + return _tempfilepager(generator, 'more <', color) + if hasattr(os, 'system') and os.system('(less) 2>/dev/null') == 0: + return _pipepager(generator, 'less', color) + + import tempfile + fd, filename = tempfile.mkstemp() + os.close(fd) + try: + if hasattr(os, 'system') and os.system('more "%s"' % filename) == 0: + return _pipepager(generator, 'more', color) + return _nullpager(stdout, generator, color) + finally: + os.unlink(filename) + + +def _pipepager(generator, cmd, color): + """Page through text by feeding it to another program. Invoking a + pager through this might support colors. + """ + import subprocess + env = dict(os.environ) + + # If we're piping to less we might support colors under the + # condition that + cmd_detail = cmd.rsplit('/', 1)[-1].split() + if color is None and cmd_detail[0] == 'less': + less_flags = os.environ.get('LESS', '') + ' '.join(cmd_detail[1:]) + if not less_flags: + env['LESS'] = '-R' + color = True + elif 'r' in less_flags or 'R' in less_flags: + color = True + + c = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, + env=env) + encoding = get_best_encoding(c.stdin) + try: + for text in generator: + if not color: + text = strip_ansi(text) + + c.stdin.write(text.encode(encoding, 'replace')) + except (IOError, KeyboardInterrupt): + pass + else: + c.stdin.close() + + # Less doesn't respect ^C, but catches it for its own UI purposes (aborting + # search or other commands inside less). + # + # That means when the user hits ^C, the parent process (click) terminates, + # but less is still alive, paging the output and messing up the terminal. + # + # If the user wants to make the pager exit on ^C, they should set + # `LESS='-K'`. It's not our decision to make. + while True: + try: + c.wait() + except KeyboardInterrupt: + pass + else: + break + + +def _tempfilepager(generator, cmd, color): + """Page through text by invoking a program on a temporary file.""" + import tempfile + filename = tempfile.mktemp() + # TODO: This never terminates if the passed generator never terminates. + text = "".join(generator) + if not color: + text = strip_ansi(text) + encoding = get_best_encoding(sys.stdout) + with open_stream(filename, 'wb')[0] as f: + f.write(text.encode(encoding)) + try: + os.system(cmd + ' "' + filename + '"') + finally: + os.unlink(filename) + + +def _nullpager(stream, generator, color): + """Simply print unformatted text. This is the ultimate fallback.""" + for text in generator: + if not color: + text = strip_ansi(text) + stream.write(text) + + +class Editor(object): + + def __init__(self, editor=None, env=None, require_save=True, + extension='.txt'): + self.editor = editor + self.env = env + self.require_save = require_save + self.extension = extension + + def get_editor(self): + if self.editor is not None: + return self.editor + for key in 'VISUAL', 'EDITOR': + rv = os.environ.get(key) + if rv: + return rv + if WIN: + return 'notepad' + for editor in 'vim', 'nano': + if os.system('which %s >/dev/null 2>&1' % editor) == 0: + return editor + return 'vi' + + def edit_file(self, filename): + import subprocess + editor = self.get_editor() + if self.env: + environ = os.environ.copy() + environ.update(self.env) + else: + environ = None + try: + c = subprocess.Popen('%s "%s"' % (editor, filename), + env=environ, shell=True) + exit_code = c.wait() + if exit_code != 0: + raise ClickException('%s: Editing failed!' % editor) + except OSError as e: + raise ClickException('%s: Editing failed: %s' % (editor, e)) + + def edit(self, text): + import tempfile + + text = text or '' + if text and not text.endswith('\n'): + text += '\n' + + fd, name = tempfile.mkstemp(prefix='editor-', suffix=self.extension) + try: + if WIN: + encoding = 'utf-8-sig' + text = text.replace('\n', '\r\n') + else: + encoding = 'utf-8' + text = text.encode(encoding) + + f = os.fdopen(fd, 'wb') + f.write(text) + f.close() + timestamp = os.path.getmtime(name) + + self.edit_file(name) + + if self.require_save \ + and os.path.getmtime(name) == timestamp: + return None + + f = open(name, 'rb') + try: + rv = f.read() + finally: + f.close() + return rv.decode('utf-8-sig').replace('\r\n', '\n') + finally: + os.unlink(name) + + +def open_url(url, wait=False, locate=False): + import subprocess + + def _unquote_file(url): + try: + import urllib + except ImportError: + import urllib + if url.startswith('file://'): + url = urllib.unquote(url[7:]) + return url + + if sys.platform == 'darwin': + args = ['open'] + if wait: + args.append('-W') + if locate: + args.append('-R') + args.append(_unquote_file(url)) + null = open('/dev/null', 'w') + try: + return subprocess.Popen(args, stderr=null).wait() + finally: + null.close() + elif WIN: + if locate: + url = _unquote_file(url) + args = 'explorer /select,"%s"' % _unquote_file( + url.replace('"', '')) + else: + args = 'start %s "" "%s"' % ( + wait and '/WAIT' or '', url.replace('"', '')) + return os.system(args) + elif CYGWIN: + if locate: + url = _unquote_file(url) + args = 'cygstart "%s"' % (os.path.dirname(url).replace('"', '')) + else: + args = 'cygstart %s "%s"' % ( + wait and '-w' or '', url.replace('"', '')) + return os.system(args) + + try: + if locate: + url = os.path.dirname(_unquote_file(url)) or '.' + else: + url = _unquote_file(url) + c = subprocess.Popen(['xdg-open', url]) + if wait: + return c.wait() + return 0 + except OSError: + if url.startswith(('http://', 'https://')) and not locate and not wait: + import webbrowser + webbrowser.open(url) + return 0 + return 1 + + +def _translate_ch_to_exc(ch): + if ch == u'\x03': + raise KeyboardInterrupt() + if ch == u'\x04' and not WIN: # Unix-like, Ctrl+D + raise EOFError() + if ch == u'\x1a' and WIN: # Windows, Ctrl+Z + raise EOFError() + + +if WIN: + import msvcrt + + @contextlib.contextmanager + def raw_terminal(): + yield + + def getchar(echo): + # The function `getch` will return a bytes object corresponding to + # the pressed character. Since Windows 10 build 1803, it will also + # return \x00 when called a second time after pressing a regular key. + # + # `getwch` does not share this probably-bugged behavior. Moreover, it + # returns a Unicode object by default, which is what we want. + # + # Either of these functions will return \x00 or \xe0 to indicate + # a special key, and you need to call the same function again to get + # the "rest" of the code. The fun part is that \u00e0 is + # "latin small letter a with grave", so if you type that on a French + # keyboard, you _also_ get a \xe0. + # E.g., consider the Up arrow. This returns \xe0 and then \x48. The + # resulting Unicode string reads as "a with grave" + "capital H". + # This is indistinguishable from when the user actually types + # "a with grave" and then "capital H". + # + # When \xe0 is returned, we assume it's part of a special-key sequence + # and call `getwch` again, but that means that when the user types + # the \u00e0 character, `getchar` doesn't return until a second + # character is typed. + # The alternative is returning immediately, but that would mess up + # cross-platform handling of arrow keys and others that start with + # \xe0. Another option is using `getch`, but then we can't reliably + # read non-ASCII characters, because return values of `getch` are + # limited to the current 8-bit codepage. + # + # Anyway, Click doesn't claim to do this Right(tm), and using `getwch` + # is doing the right thing in more situations than with `getch`. + if echo: + func = msvcrt.getwche + else: + func = msvcrt.getwch + + rv = func() + if rv in (u'\x00', u'\xe0'): + # \x00 and \xe0 are control characters that indicate special key, + # see above. + rv += func() + _translate_ch_to_exc(rv) + return rv +else: + import tty + import termios + + @contextlib.contextmanager + def raw_terminal(): + if not isatty(sys.stdin): + f = open('/dev/tty') + fd = f.fileno() + else: + fd = sys.stdin.fileno() + f = None + try: + old_settings = termios.tcgetattr(fd) + try: + tty.setraw(fd) + yield fd + finally: + termios.tcsetattr(fd, termios.TCSADRAIN, old_settings) + sys.stdout.flush() + if f is not None: + f.close() + except termios.error: + pass + + def getchar(echo): + with raw_terminal() as fd: + ch = os.read(fd, 32) + ch = ch.decode(get_best_encoding(sys.stdin), 'replace') + if echo and isatty(sys.stdout): + sys.stdout.write(ch) + _translate_ch_to_exc(ch) + return ch diff --git a/venv/lib/python3.7/site-packages/click/_textwrap.py b/venv/lib/python3.7/site-packages/click/_textwrap.py new file mode 100644 index 0000000..7e77603 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/_textwrap.py @@ -0,0 +1,38 @@ +import textwrap +from contextlib import contextmanager + + +class TextWrapper(textwrap.TextWrapper): + + def _handle_long_word(self, reversed_chunks, cur_line, cur_len, width): + space_left = max(width - cur_len, 1) + + if self.break_long_words: + last = reversed_chunks[-1] + cut = last[:space_left] + res = last[space_left:] + cur_line.append(cut) + reversed_chunks[-1] = res + elif not cur_line: + cur_line.append(reversed_chunks.pop()) + + @contextmanager + def extra_indent(self, indent): + old_initial_indent = self.initial_indent + old_subsequent_indent = self.subsequent_indent + self.initial_indent += indent + self.subsequent_indent += indent + try: + yield + finally: + self.initial_indent = old_initial_indent + self.subsequent_indent = old_subsequent_indent + + def indent_only(self, text): + rv = [] + for idx, line in enumerate(text.splitlines()): + indent = self.initial_indent + if idx > 0: + indent = self.subsequent_indent + rv.append(indent + line) + return '\n'.join(rv) diff --git a/venv/lib/python3.7/site-packages/click/_unicodefun.py b/venv/lib/python3.7/site-packages/click/_unicodefun.py new file mode 100644 index 0000000..620edff --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/_unicodefun.py @@ -0,0 +1,125 @@ +import os +import sys +import codecs + +from ._compat import PY2 + + +# If someone wants to vendor click, we want to ensure the +# correct package is discovered. Ideally we could use a +# relative import here but unfortunately Python does not +# support that. +click = sys.modules[__name__.rsplit('.', 1)[0]] + + +def _find_unicode_literals_frame(): + import __future__ + if not hasattr(sys, '_getframe'): # not all Python implementations have it + return 0 + frm = sys._getframe(1) + idx = 1 + while frm is not None: + if frm.f_globals.get('__name__', '').startswith('click.'): + frm = frm.f_back + idx += 1 + elif frm.f_code.co_flags & __future__.unicode_literals.compiler_flag: + return idx + else: + break + return 0 + + +def _check_for_unicode_literals(): + if not __debug__: + return + if not PY2 or click.disable_unicode_literals_warning: + return + bad_frame = _find_unicode_literals_frame() + if bad_frame <= 0: + return + from warnings import warn + warn(Warning('Click detected the use of the unicode_literals ' + '__future__ import. This is heavily discouraged ' + 'because it can introduce subtle bugs in your ' + 'code. You should instead use explicit u"" literals ' + 'for your unicode strings. For more information see ' + 'https://click.palletsprojects.com/python3/'), + stacklevel=bad_frame) + + +def _verify_python3_env(): + """Ensures that the environment is good for unicode on Python 3.""" + if PY2: + return + try: + import locale + fs_enc = codecs.lookup(locale.getpreferredencoding()).name + except Exception: + fs_enc = 'ascii' + if fs_enc != 'ascii': + return + + extra = '' + if os.name == 'posix': + import subprocess + try: + rv = subprocess.Popen(['locale', '-a'], stdout=subprocess.PIPE, + stderr=subprocess.PIPE).communicate()[0] + except OSError: + rv = b'' + good_locales = set() + has_c_utf8 = False + + # Make sure we're operating on text here. + if isinstance(rv, bytes): + rv = rv.decode('ascii', 'replace') + + for line in rv.splitlines(): + locale = line.strip() + if locale.lower().endswith(('.utf-8', '.utf8')): + good_locales.add(locale) + if locale.lower() in ('c.utf8', 'c.utf-8'): + has_c_utf8 = True + + extra += '\n\n' + if not good_locales: + extra += ( + 'Additional information: on this system no suitable UTF-8\n' + 'locales were discovered. This most likely requires resolving\n' + 'by reconfiguring the locale system.' + ) + elif has_c_utf8: + extra += ( + 'This system supports the C.UTF-8 locale which is recommended.\n' + 'You might be able to resolve your issue by exporting the\n' + 'following environment variables:\n\n' + ' export LC_ALL=C.UTF-8\n' + ' export LANG=C.UTF-8' + ) + else: + extra += ( + 'This system lists a couple of UTF-8 supporting locales that\n' + 'you can pick from. The following suitable locales were\n' + 'discovered: %s' + ) % ', '.join(sorted(good_locales)) + + bad_locale = None + for locale in os.environ.get('LC_ALL'), os.environ.get('LANG'): + if locale and locale.lower().endswith(('.utf-8', '.utf8')): + bad_locale = locale + if locale is not None: + break + if bad_locale is not None: + extra += ( + '\n\nClick discovered that you exported a UTF-8 locale\n' + 'but the locale system could not pick up from it because\n' + 'it does not exist. The exported locale is "%s" but it\n' + 'is not supported' + ) % bad_locale + + raise RuntimeError( + 'Click will abort further execution because Python 3 was' + ' configured to use ASCII as encoding for the environment.' + ' Consult https://click.palletsprojects.com/en/7.x/python3/ for' + ' mitigation steps.' + extra + ) diff --git a/venv/lib/python3.7/site-packages/click/_winconsole.py b/venv/lib/python3.7/site-packages/click/_winconsole.py new file mode 100644 index 0000000..bbb080d --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/_winconsole.py @@ -0,0 +1,307 @@ +# -*- coding: utf-8 -*- +# This module is based on the excellent work by Adam Bartoš who +# provided a lot of what went into the implementation here in +# the discussion to issue1602 in the Python bug tracker. +# +# There are some general differences in regards to how this works +# compared to the original patches as we do not need to patch +# the entire interpreter but just work in our little world of +# echo and prmopt. + +import io +import os +import sys +import zlib +import time +import ctypes +import msvcrt +from ._compat import _NonClosingTextIOWrapper, text_type, PY2 +from ctypes import byref, POINTER, c_int, c_char, c_char_p, \ + c_void_p, py_object, c_ssize_t, c_ulong, windll, WINFUNCTYPE +try: + from ctypes import pythonapi + PyObject_GetBuffer = pythonapi.PyObject_GetBuffer + PyBuffer_Release = pythonapi.PyBuffer_Release +except ImportError: + pythonapi = None +from ctypes.wintypes import LPWSTR, LPCWSTR + + +c_ssize_p = POINTER(c_ssize_t) + +kernel32 = windll.kernel32 +GetStdHandle = kernel32.GetStdHandle +ReadConsoleW = kernel32.ReadConsoleW +WriteConsoleW = kernel32.WriteConsoleW +GetLastError = kernel32.GetLastError +GetCommandLineW = WINFUNCTYPE(LPWSTR)( + ('GetCommandLineW', windll.kernel32)) +CommandLineToArgvW = WINFUNCTYPE( + POINTER(LPWSTR), LPCWSTR, POINTER(c_int))( + ('CommandLineToArgvW', windll.shell32)) + + +STDIN_HANDLE = GetStdHandle(-10) +STDOUT_HANDLE = GetStdHandle(-11) +STDERR_HANDLE = GetStdHandle(-12) + + +PyBUF_SIMPLE = 0 +PyBUF_WRITABLE = 1 + +ERROR_SUCCESS = 0 +ERROR_NOT_ENOUGH_MEMORY = 8 +ERROR_OPERATION_ABORTED = 995 + +STDIN_FILENO = 0 +STDOUT_FILENO = 1 +STDERR_FILENO = 2 + +EOF = b'\x1a' +MAX_BYTES_WRITTEN = 32767 + + +class Py_buffer(ctypes.Structure): + _fields_ = [ + ('buf', c_void_p), + ('obj', py_object), + ('len', c_ssize_t), + ('itemsize', c_ssize_t), + ('readonly', c_int), + ('ndim', c_int), + ('format', c_char_p), + ('shape', c_ssize_p), + ('strides', c_ssize_p), + ('suboffsets', c_ssize_p), + ('internal', c_void_p) + ] + + if PY2: + _fields_.insert(-1, ('smalltable', c_ssize_t * 2)) + + +# On PyPy we cannot get buffers so our ability to operate here is +# serverly limited. +if pythonapi is None: + get_buffer = None +else: + def get_buffer(obj, writable=False): + buf = Py_buffer() + flags = PyBUF_WRITABLE if writable else PyBUF_SIMPLE + PyObject_GetBuffer(py_object(obj), byref(buf), flags) + try: + buffer_type = c_char * buf.len + return buffer_type.from_address(buf.buf) + finally: + PyBuffer_Release(byref(buf)) + + +class _WindowsConsoleRawIOBase(io.RawIOBase): + + def __init__(self, handle): + self.handle = handle + + def isatty(self): + io.RawIOBase.isatty(self) + return True + + +class _WindowsConsoleReader(_WindowsConsoleRawIOBase): + + def readable(self): + return True + + def readinto(self, b): + bytes_to_be_read = len(b) + if not bytes_to_be_read: + return 0 + elif bytes_to_be_read % 2: + raise ValueError('cannot read odd number of bytes from ' + 'UTF-16-LE encoded console') + + buffer = get_buffer(b, writable=True) + code_units_to_be_read = bytes_to_be_read // 2 + code_units_read = c_ulong() + + rv = ReadConsoleW(self.handle, buffer, code_units_to_be_read, + byref(code_units_read), None) + if GetLastError() == ERROR_OPERATION_ABORTED: + # wait for KeyboardInterrupt + time.sleep(0.1) + if not rv: + raise OSError('Windows error: %s' % GetLastError()) + + if buffer[0] == EOF: + return 0 + return 2 * code_units_read.value + + +class _WindowsConsoleWriter(_WindowsConsoleRawIOBase): + + def writable(self): + return True + + @staticmethod + def _get_error_message(errno): + if errno == ERROR_SUCCESS: + return 'ERROR_SUCCESS' + elif errno == ERROR_NOT_ENOUGH_MEMORY: + return 'ERROR_NOT_ENOUGH_MEMORY' + return 'Windows error %s' % errno + + def write(self, b): + bytes_to_be_written = len(b) + buf = get_buffer(b) + code_units_to_be_written = min(bytes_to_be_written, + MAX_BYTES_WRITTEN) // 2 + code_units_written = c_ulong() + + WriteConsoleW(self.handle, buf, code_units_to_be_written, + byref(code_units_written), None) + bytes_written = 2 * code_units_written.value + + if bytes_written == 0 and bytes_to_be_written > 0: + raise OSError(self._get_error_message(GetLastError())) + return bytes_written + + +class ConsoleStream(object): + + def __init__(self, text_stream, byte_stream): + self._text_stream = text_stream + self.buffer = byte_stream + + @property + def name(self): + return self.buffer.name + + def write(self, x): + if isinstance(x, text_type): + return self._text_stream.write(x) + try: + self.flush() + except Exception: + pass + return self.buffer.write(x) + + def writelines(self, lines): + for line in lines: + self.write(line) + + def __getattr__(self, name): + return getattr(self._text_stream, name) + + def isatty(self): + return self.buffer.isatty() + + def __repr__(self): + return '' % ( + self.name, + self.encoding, + ) + + +class WindowsChunkedWriter(object): + """ + Wraps a stream (such as stdout), acting as a transparent proxy for all + attribute access apart from method 'write()' which we wrap to write in + limited chunks due to a Windows limitation on binary console streams. + """ + def __init__(self, wrapped): + # double-underscore everything to prevent clashes with names of + # attributes on the wrapped stream object. + self.__wrapped = wrapped + + def __getattr__(self, name): + return getattr(self.__wrapped, name) + + def write(self, text): + total_to_write = len(text) + written = 0 + + while written < total_to_write: + to_write = min(total_to_write - written, MAX_BYTES_WRITTEN) + self.__wrapped.write(text[written:written+to_write]) + written += to_write + + +_wrapped_std_streams = set() + + +def _wrap_std_stream(name): + # Python 2 & Windows 7 and below + if PY2 and sys.getwindowsversion()[:2] <= (6, 1) and name not in _wrapped_std_streams: + setattr(sys, name, WindowsChunkedWriter(getattr(sys, name))) + _wrapped_std_streams.add(name) + + +def _get_text_stdin(buffer_stream): + text_stream = _NonClosingTextIOWrapper( + io.BufferedReader(_WindowsConsoleReader(STDIN_HANDLE)), + 'utf-16-le', 'strict', line_buffering=True) + return ConsoleStream(text_stream, buffer_stream) + + +def _get_text_stdout(buffer_stream): + text_stream = _NonClosingTextIOWrapper( + io.BufferedWriter(_WindowsConsoleWriter(STDOUT_HANDLE)), + 'utf-16-le', 'strict', line_buffering=True) + return ConsoleStream(text_stream, buffer_stream) + + +def _get_text_stderr(buffer_stream): + text_stream = _NonClosingTextIOWrapper( + io.BufferedWriter(_WindowsConsoleWriter(STDERR_HANDLE)), + 'utf-16-le', 'strict', line_buffering=True) + return ConsoleStream(text_stream, buffer_stream) + + +if PY2: + def _hash_py_argv(): + return zlib.crc32('\x00'.join(sys.argv[1:])) + + _initial_argv_hash = _hash_py_argv() + + def _get_windows_argv(): + argc = c_int(0) + argv_unicode = CommandLineToArgvW(GetCommandLineW(), byref(argc)) + argv = [argv_unicode[i] for i in range(0, argc.value)] + + if not hasattr(sys, 'frozen'): + argv = argv[1:] + while len(argv) > 0: + arg = argv[0] + if not arg.startswith('-') or arg == '-': + break + argv = argv[1:] + if arg.startswith(('-c', '-m')): + break + + return argv[1:] + + +_stream_factories = { + 0: _get_text_stdin, + 1: _get_text_stdout, + 2: _get_text_stderr, +} + + +def _get_windows_console_stream(f, encoding, errors): + if get_buffer is not None and \ + encoding in ('utf-16-le', None) \ + and errors in ('strict', None) and \ + hasattr(f, 'isatty') and f.isatty(): + func = _stream_factories.get(f.fileno()) + if func is not None: + if not PY2: + f = getattr(f, 'buffer', None) + if f is None: + return None + else: + # If we are on Python 2 we need to set the stream that we + # deal with to binary mode as otherwise the exercise if a + # bit moot. The same problems apply as for + # get_binary_stdin and friends from _compat. + msvcrt.setmode(f.fileno(), os.O_BINARY) + return func(f) diff --git a/venv/lib/python3.7/site-packages/click/core.py b/venv/lib/python3.7/site-packages/click/core.py new file mode 100644 index 0000000..7a1e342 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/core.py @@ -0,0 +1,1856 @@ +import errno +import inspect +import os +import sys +from contextlib import contextmanager +from itertools import repeat +from functools import update_wrapper + +from .types import convert_type, IntRange, BOOL +from .utils import PacifyFlushWrapper, make_str, make_default_short_help, \ + echo, get_os_args +from .exceptions import ClickException, UsageError, BadParameter, Abort, \ + MissingParameter, Exit +from .termui import prompt, confirm, style +from .formatting import HelpFormatter, join_options +from .parser import OptionParser, split_opt +from .globals import push_context, pop_context + +from ._compat import PY2, isidentifier, iteritems, string_types +from ._unicodefun import _check_for_unicode_literals, _verify_python3_env + + +_missing = object() + + +SUBCOMMAND_METAVAR = 'COMMAND [ARGS]...' +SUBCOMMANDS_METAVAR = 'COMMAND1 [ARGS]... [COMMAND2 [ARGS]...]...' + +DEPRECATED_HELP_NOTICE = ' (DEPRECATED)' +DEPRECATED_INVOKE_NOTICE = 'DeprecationWarning: ' + \ + 'The command %(name)s is deprecated.' + + +def _maybe_show_deprecated_notice(cmd): + if cmd.deprecated: + echo(style(DEPRECATED_INVOKE_NOTICE % {'name': cmd.name}, fg='red'), err=True) + + +def fast_exit(code): + """Exit without garbage collection, this speeds up exit by about 10ms for + things like bash completion. + """ + sys.stdout.flush() + sys.stderr.flush() + os._exit(code) + + +def _bashcomplete(cmd, prog_name, complete_var=None): + """Internal handler for the bash completion support.""" + if complete_var is None: + complete_var = '_%s_COMPLETE' % (prog_name.replace('-', '_')).upper() + complete_instr = os.environ.get(complete_var) + if not complete_instr: + return + + from ._bashcomplete import bashcomplete + if bashcomplete(cmd, prog_name, complete_var, complete_instr): + fast_exit(1) + + +def _check_multicommand(base_command, cmd_name, cmd, register=False): + if not base_command.chain or not isinstance(cmd, MultiCommand): + return + if register: + hint = 'It is not possible to add multi commands as children to ' \ + 'another multi command that is in chain mode' + else: + hint = 'Found a multi command as subcommand to a multi command ' \ + 'that is in chain mode. This is not supported' + raise RuntimeError('%s. Command "%s" is set to chain and "%s" was ' + 'added as subcommand but it in itself is a ' + 'multi command. ("%s" is a %s within a chained ' + '%s named "%s").' % ( + hint, base_command.name, cmd_name, + cmd_name, cmd.__class__.__name__, + base_command.__class__.__name__, + base_command.name)) + + +def batch(iterable, batch_size): + return list(zip(*repeat(iter(iterable), batch_size))) + + +def invoke_param_callback(callback, ctx, param, value): + code = getattr(callback, '__code__', None) + args = getattr(code, 'co_argcount', 3) + + if args < 3: + # This will become a warning in Click 3.0: + from warnings import warn + warn(Warning('Invoked legacy parameter callback "%s". The new ' + 'signature for such callbacks starting with ' + 'click 2.0 is (ctx, param, value).' + % callback), stacklevel=3) + return callback(ctx, value) + return callback(ctx, param, value) + + +@contextmanager +def augment_usage_errors(ctx, param=None): + """Context manager that attaches extra information to exceptions that + fly. + """ + try: + yield + except BadParameter as e: + if e.ctx is None: + e.ctx = ctx + if param is not None and e.param is None: + e.param = param + raise + except UsageError as e: + if e.ctx is None: + e.ctx = ctx + raise + + +def iter_params_for_processing(invocation_order, declaration_order): + """Given a sequence of parameters in the order as should be considered + for processing and an iterable of parameters that exist, this returns + a list in the correct order as they should be processed. + """ + def sort_key(item): + try: + idx = invocation_order.index(item) + except ValueError: + idx = float('inf') + return (not item.is_eager, idx) + + return sorted(declaration_order, key=sort_key) + + +class Context(object): + """The context is a special internal object that holds state relevant + for the script execution at every single level. It's normally invisible + to commands unless they opt-in to getting access to it. + + The context is useful as it can pass internal objects around and can + control special execution features such as reading data from + environment variables. + + A context can be used as context manager in which case it will call + :meth:`close` on teardown. + + .. versionadded:: 2.0 + Added the `resilient_parsing`, `help_option_names`, + `token_normalize_func` parameters. + + .. versionadded:: 3.0 + Added the `allow_extra_args` and `allow_interspersed_args` + parameters. + + .. versionadded:: 4.0 + Added the `color`, `ignore_unknown_options`, and + `max_content_width` parameters. + + :param command: the command class for this context. + :param parent: the parent context. + :param info_name: the info name for this invocation. Generally this + is the most descriptive name for the script or + command. For the toplevel script it is usually + the name of the script, for commands below it it's + the name of the script. + :param obj: an arbitrary object of user data. + :param auto_envvar_prefix: the prefix to use for automatic environment + variables. If this is `None` then reading + from environment variables is disabled. This + does not affect manually set environment + variables which are always read. + :param default_map: a dictionary (like object) with default values + for parameters. + :param terminal_width: the width of the terminal. The default is + inherit from parent context. If no context + defines the terminal width then auto + detection will be applied. + :param max_content_width: the maximum width for content rendered by + Click (this currently only affects help + pages). This defaults to 80 characters if + not overridden. In other words: even if the + terminal is larger than that, Click will not + format things wider than 80 characters by + default. In addition to that, formatters might + add some safety mapping on the right. + :param resilient_parsing: if this flag is enabled then Click will + parse without any interactivity or callback + invocation. Default values will also be + ignored. This is useful for implementing + things such as completion support. + :param allow_extra_args: if this is set to `True` then extra arguments + at the end will not raise an error and will be + kept on the context. The default is to inherit + from the command. + :param allow_interspersed_args: if this is set to `False` then options + and arguments cannot be mixed. The + default is to inherit from the command. + :param ignore_unknown_options: instructs click to ignore options it does + not know and keeps them for later + processing. + :param help_option_names: optionally a list of strings that define how + the default help parameter is named. The + default is ``['--help']``. + :param token_normalize_func: an optional function that is used to + normalize tokens (options, choices, + etc.). This for instance can be used to + implement case insensitive behavior. + :param color: controls if the terminal supports ANSI colors or not. The + default is autodetection. This is only needed if ANSI + codes are used in texts that Click prints which is by + default not the case. This for instance would affect + help output. + """ + + def __init__(self, command, parent=None, info_name=None, obj=None, + auto_envvar_prefix=None, default_map=None, + terminal_width=None, max_content_width=None, + resilient_parsing=False, allow_extra_args=None, + allow_interspersed_args=None, + ignore_unknown_options=None, help_option_names=None, + token_normalize_func=None, color=None): + #: the parent context or `None` if none exists. + self.parent = parent + #: the :class:`Command` for this context. + self.command = command + #: the descriptive information name + self.info_name = info_name + #: the parsed parameters except if the value is hidden in which + #: case it's not remembered. + self.params = {} + #: the leftover arguments. + self.args = [] + #: protected arguments. These are arguments that are prepended + #: to `args` when certain parsing scenarios are encountered but + #: must be never propagated to another arguments. This is used + #: to implement nested parsing. + self.protected_args = [] + if obj is None and parent is not None: + obj = parent.obj + #: the user object stored. + self.obj = obj + self._meta = getattr(parent, 'meta', {}) + + #: A dictionary (-like object) with defaults for parameters. + if default_map is None \ + and parent is not None \ + and parent.default_map is not None: + default_map = parent.default_map.get(info_name) + self.default_map = default_map + + #: This flag indicates if a subcommand is going to be executed. A + #: group callback can use this information to figure out if it's + #: being executed directly or because the execution flow passes + #: onwards to a subcommand. By default it's None, but it can be + #: the name of the subcommand to execute. + #: + #: If chaining is enabled this will be set to ``'*'`` in case + #: any commands are executed. It is however not possible to + #: figure out which ones. If you require this knowledge you + #: should use a :func:`resultcallback`. + self.invoked_subcommand = None + + if terminal_width is None and parent is not None: + terminal_width = parent.terminal_width + #: The width of the terminal (None is autodetection). + self.terminal_width = terminal_width + + if max_content_width is None and parent is not None: + max_content_width = parent.max_content_width + #: The maximum width of formatted content (None implies a sensible + #: default which is 80 for most things). + self.max_content_width = max_content_width + + if allow_extra_args is None: + allow_extra_args = command.allow_extra_args + #: Indicates if the context allows extra args or if it should + #: fail on parsing. + #: + #: .. versionadded:: 3.0 + self.allow_extra_args = allow_extra_args + + if allow_interspersed_args is None: + allow_interspersed_args = command.allow_interspersed_args + #: Indicates if the context allows mixing of arguments and + #: options or not. + #: + #: .. versionadded:: 3.0 + self.allow_interspersed_args = allow_interspersed_args + + if ignore_unknown_options is None: + ignore_unknown_options = command.ignore_unknown_options + #: Instructs click to ignore options that a command does not + #: understand and will store it on the context for later + #: processing. This is primarily useful for situations where you + #: want to call into external programs. Generally this pattern is + #: strongly discouraged because it's not possibly to losslessly + #: forward all arguments. + #: + #: .. versionadded:: 4.0 + self.ignore_unknown_options = ignore_unknown_options + + if help_option_names is None: + if parent is not None: + help_option_names = parent.help_option_names + else: + help_option_names = ['--help'] + + #: The names for the help options. + self.help_option_names = help_option_names + + if token_normalize_func is None and parent is not None: + token_normalize_func = parent.token_normalize_func + + #: An optional normalization function for tokens. This is + #: options, choices, commands etc. + self.token_normalize_func = token_normalize_func + + #: Indicates if resilient parsing is enabled. In that case Click + #: will do its best to not cause any failures and default values + #: will be ignored. Useful for completion. + self.resilient_parsing = resilient_parsing + + # If there is no envvar prefix yet, but the parent has one and + # the command on this level has a name, we can expand the envvar + # prefix automatically. + if auto_envvar_prefix is None: + if parent is not None \ + and parent.auto_envvar_prefix is not None and \ + self.info_name is not None: + auto_envvar_prefix = '%s_%s' % (parent.auto_envvar_prefix, + self.info_name.upper()) + else: + auto_envvar_prefix = auto_envvar_prefix.upper() + self.auto_envvar_prefix = auto_envvar_prefix + + if color is None and parent is not None: + color = parent.color + + #: Controls if styling output is wanted or not. + self.color = color + + self._close_callbacks = [] + self._depth = 0 + + def __enter__(self): + self._depth += 1 + push_context(self) + return self + + def __exit__(self, exc_type, exc_value, tb): + self._depth -= 1 + if self._depth == 0: + self.close() + pop_context() + + @contextmanager + def scope(self, cleanup=True): + """This helper method can be used with the context object to promote + it to the current thread local (see :func:`get_current_context`). + The default behavior of this is to invoke the cleanup functions which + can be disabled by setting `cleanup` to `False`. The cleanup + functions are typically used for things such as closing file handles. + + If the cleanup is intended the context object can also be directly + used as a context manager. + + Example usage:: + + with ctx.scope(): + assert get_current_context() is ctx + + This is equivalent:: + + with ctx: + assert get_current_context() is ctx + + .. versionadded:: 5.0 + + :param cleanup: controls if the cleanup functions should be run or + not. The default is to run these functions. In + some situations the context only wants to be + temporarily pushed in which case this can be disabled. + Nested pushes automatically defer the cleanup. + """ + if not cleanup: + self._depth += 1 + try: + with self as rv: + yield rv + finally: + if not cleanup: + self._depth -= 1 + + @property + def meta(self): + """This is a dictionary which is shared with all the contexts + that are nested. It exists so that click utilities can store some + state here if they need to. It is however the responsibility of + that code to manage this dictionary well. + + The keys are supposed to be unique dotted strings. For instance + module paths are a good choice for it. What is stored in there is + irrelevant for the operation of click. However what is important is + that code that places data here adheres to the general semantics of + the system. + + Example usage:: + + LANG_KEY = __name__ + '.lang' + + def set_language(value): + ctx = get_current_context() + ctx.meta[LANG_KEY] = value + + def get_language(): + return get_current_context().meta.get(LANG_KEY, 'en_US') + + .. versionadded:: 5.0 + """ + return self._meta + + def make_formatter(self): + """Creates the formatter for the help and usage output.""" + return HelpFormatter(width=self.terminal_width, + max_width=self.max_content_width) + + def call_on_close(self, f): + """This decorator remembers a function as callback that should be + executed when the context tears down. This is most useful to bind + resource handling to the script execution. For instance, file objects + opened by the :class:`File` type will register their close callbacks + here. + + :param f: the function to execute on teardown. + """ + self._close_callbacks.append(f) + return f + + def close(self): + """Invokes all close callbacks.""" + for cb in self._close_callbacks: + cb() + self._close_callbacks = [] + + @property + def command_path(self): + """The computed command path. This is used for the ``usage`` + information on the help page. It's automatically created by + combining the info names of the chain of contexts to the root. + """ + rv = '' + if self.info_name is not None: + rv = self.info_name + if self.parent is not None: + rv = self.parent.command_path + ' ' + rv + return rv.lstrip() + + def find_root(self): + """Finds the outermost context.""" + node = self + while node.parent is not None: + node = node.parent + return node + + def find_object(self, object_type): + """Finds the closest object of a given type.""" + node = self + while node is not None: + if isinstance(node.obj, object_type): + return node.obj + node = node.parent + + def ensure_object(self, object_type): + """Like :meth:`find_object` but sets the innermost object to a + new instance of `object_type` if it does not exist. + """ + rv = self.find_object(object_type) + if rv is None: + self.obj = rv = object_type() + return rv + + def lookup_default(self, name): + """Looks up the default for a parameter name. This by default + looks into the :attr:`default_map` if available. + """ + if self.default_map is not None: + rv = self.default_map.get(name) + if callable(rv): + rv = rv() + return rv + + def fail(self, message): + """Aborts the execution of the program with a specific error + message. + + :param message: the error message to fail with. + """ + raise UsageError(message, self) + + def abort(self): + """Aborts the script.""" + raise Abort() + + def exit(self, code=0): + """Exits the application with a given exit code.""" + raise Exit(code) + + def get_usage(self): + """Helper method to get formatted usage string for the current + context and command. + """ + return self.command.get_usage(self) + + def get_help(self): + """Helper method to get formatted help page for the current + context and command. + """ + return self.command.get_help(self) + + def invoke(*args, **kwargs): + """Invokes a command callback in exactly the way it expects. There + are two ways to invoke this method: + + 1. the first argument can be a callback and all other arguments and + keyword arguments are forwarded directly to the function. + 2. the first argument is a click command object. In that case all + arguments are forwarded as well but proper click parameters + (options and click arguments) must be keyword arguments and Click + will fill in defaults. + + Note that before Click 3.2 keyword arguments were not properly filled + in against the intention of this code and no context was created. For + more information about this change and why it was done in a bugfix + release see :ref:`upgrade-to-3.2`. + """ + self, callback = args[:2] + ctx = self + + # It's also possible to invoke another command which might or + # might not have a callback. In that case we also fill + # in defaults and make a new context for this command. + if isinstance(callback, Command): + other_cmd = callback + callback = other_cmd.callback + ctx = Context(other_cmd, info_name=other_cmd.name, parent=self) + if callback is None: + raise TypeError('The given command does not have a ' + 'callback that can be invoked.') + + for param in other_cmd.params: + if param.name not in kwargs and param.expose_value: + kwargs[param.name] = param.get_default(ctx) + + args = args[2:] + with augment_usage_errors(self): + with ctx: + return callback(*args, **kwargs) + + def forward(*args, **kwargs): + """Similar to :meth:`invoke` but fills in default keyword + arguments from the current context if the other command expects + it. This cannot invoke callbacks directly, only other commands. + """ + self, cmd = args[:2] + + # It's also possible to invoke another command which might or + # might not have a callback. + if not isinstance(cmd, Command): + raise TypeError('Callback is not a command.') + + for param in self.params: + if param not in kwargs: + kwargs[param] = self.params[param] + + return self.invoke(cmd, **kwargs) + + +class BaseCommand(object): + """The base command implements the minimal API contract of commands. + Most code will never use this as it does not implement a lot of useful + functionality but it can act as the direct subclass of alternative + parsing methods that do not depend on the Click parser. + + For instance, this can be used to bridge Click and other systems like + argparse or docopt. + + Because base commands do not implement a lot of the API that other + parts of Click take for granted, they are not supported for all + operations. For instance, they cannot be used with the decorators + usually and they have no built-in callback system. + + .. versionchanged:: 2.0 + Added the `context_settings` parameter. + + :param name: the name of the command to use unless a group overrides it. + :param context_settings: an optional dictionary with defaults that are + passed to the context object. + """ + #: the default for the :attr:`Context.allow_extra_args` flag. + allow_extra_args = False + #: the default for the :attr:`Context.allow_interspersed_args` flag. + allow_interspersed_args = True + #: the default for the :attr:`Context.ignore_unknown_options` flag. + ignore_unknown_options = False + + def __init__(self, name, context_settings=None): + #: the name the command thinks it has. Upon registering a command + #: on a :class:`Group` the group will default the command name + #: with this information. You should instead use the + #: :class:`Context`\'s :attr:`~Context.info_name` attribute. + self.name = name + if context_settings is None: + context_settings = {} + #: an optional dictionary with defaults passed to the context. + self.context_settings = context_settings + + def get_usage(self, ctx): + raise NotImplementedError('Base commands cannot get usage') + + def get_help(self, ctx): + raise NotImplementedError('Base commands cannot get help') + + def make_context(self, info_name, args, parent=None, **extra): + """This function when given an info name and arguments will kick + off the parsing and create a new :class:`Context`. It does not + invoke the actual command callback though. + + :param info_name: the info name for this invokation. Generally this + is the most descriptive name for the script or + command. For the toplevel script it's usually + the name of the script, for commands below it it's + the name of the script. + :param args: the arguments to parse as list of strings. + :param parent: the parent context if available. + :param extra: extra keyword arguments forwarded to the context + constructor. + """ + for key, value in iteritems(self.context_settings): + if key not in extra: + extra[key] = value + ctx = Context(self, info_name=info_name, parent=parent, **extra) + with ctx.scope(cleanup=False): + self.parse_args(ctx, args) + return ctx + + def parse_args(self, ctx, args): + """Given a context and a list of arguments this creates the parser + and parses the arguments, then modifies the context as necessary. + This is automatically invoked by :meth:`make_context`. + """ + raise NotImplementedError('Base commands do not know how to parse ' + 'arguments.') + + def invoke(self, ctx): + """Given a context, this invokes the command. The default + implementation is raising a not implemented error. + """ + raise NotImplementedError('Base commands are not invokable by default') + + def main(self, args=None, prog_name=None, complete_var=None, + standalone_mode=True, **extra): + """This is the way to invoke a script with all the bells and + whistles as a command line application. This will always terminate + the application after a call. If this is not wanted, ``SystemExit`` + needs to be caught. + + This method is also available by directly calling the instance of + a :class:`Command`. + + .. versionadded:: 3.0 + Added the `standalone_mode` flag to control the standalone mode. + + :param args: the arguments that should be used for parsing. If not + provided, ``sys.argv[1:]`` is used. + :param prog_name: the program name that should be used. By default + the program name is constructed by taking the file + name from ``sys.argv[0]``. + :param complete_var: the environment variable that controls the + bash completion support. The default is + ``"__COMPLETE"`` with prog_name in + uppercase. + :param standalone_mode: the default behavior is to invoke the script + in standalone mode. Click will then + handle exceptions and convert them into + error messages and the function will never + return but shut down the interpreter. If + this is set to `False` they will be + propagated to the caller and the return + value of this function is the return value + of :meth:`invoke`. + :param extra: extra keyword arguments are forwarded to the context + constructor. See :class:`Context` for more information. + """ + # If we are in Python 3, we will verify that the environment is + # sane at this point or reject further execution to avoid a + # broken script. + if not PY2: + _verify_python3_env() + else: + _check_for_unicode_literals() + + if args is None: + args = get_os_args() + else: + args = list(args) + + if prog_name is None: + prog_name = make_str(os.path.basename( + sys.argv and sys.argv[0] or __file__)) + + # Hook for the Bash completion. This only activates if the Bash + # completion is actually enabled, otherwise this is quite a fast + # noop. + _bashcomplete(self, prog_name, complete_var) + + try: + try: + with self.make_context(prog_name, args, **extra) as ctx: + rv = self.invoke(ctx) + if not standalone_mode: + return rv + # it's not safe to `ctx.exit(rv)` here! + # note that `rv` may actually contain data like "1" which + # has obvious effects + # more subtle case: `rv=[None, None]` can come out of + # chained commands which all returned `None` -- so it's not + # even always obvious that `rv` indicates success/failure + # by its truthiness/falsiness + ctx.exit() + except (EOFError, KeyboardInterrupt): + echo(file=sys.stderr) + raise Abort() + except ClickException as e: + if not standalone_mode: + raise + e.show() + sys.exit(e.exit_code) + except IOError as e: + if e.errno == errno.EPIPE: + sys.stdout = PacifyFlushWrapper(sys.stdout) + sys.stderr = PacifyFlushWrapper(sys.stderr) + sys.exit(1) + else: + raise + except Exit as e: + if standalone_mode: + sys.exit(e.exit_code) + else: + # in non-standalone mode, return the exit code + # note that this is only reached if `self.invoke` above raises + # an Exit explicitly -- thus bypassing the check there which + # would return its result + # the results of non-standalone execution may therefore be + # somewhat ambiguous: if there are codepaths which lead to + # `ctx.exit(1)` and to `return 1`, the caller won't be able to + # tell the difference between the two + return e.exit_code + except Abort: + if not standalone_mode: + raise + echo('Aborted!', file=sys.stderr) + sys.exit(1) + + def __call__(self, *args, **kwargs): + """Alias for :meth:`main`.""" + return self.main(*args, **kwargs) + + +class Command(BaseCommand): + """Commands are the basic building block of command line interfaces in + Click. A basic command handles command line parsing and might dispatch + more parsing to commands nested below it. + + .. versionchanged:: 2.0 + Added the `context_settings` parameter. + + :param name: the name of the command to use unless a group overrides it. + :param context_settings: an optional dictionary with defaults that are + passed to the context object. + :param callback: the callback to invoke. This is optional. + :param params: the parameters to register with this command. This can + be either :class:`Option` or :class:`Argument` objects. + :param help: the help string to use for this command. + :param epilog: like the help string but it's printed at the end of the + help page after everything else. + :param short_help: the short help to use for this command. This is + shown on the command listing of the parent command. + :param add_help_option: by default each command registers a ``--help`` + option. This can be disabled by this parameter. + :param hidden: hide this command from help outputs. + + :param deprecated: issues a message indicating that + the command is deprecated. + """ + + def __init__(self, name, context_settings=None, callback=None, + params=None, help=None, epilog=None, short_help=None, + options_metavar='[OPTIONS]', add_help_option=True, + hidden=False, deprecated=False): + BaseCommand.__init__(self, name, context_settings) + #: the callback to execute when the command fires. This might be + #: `None` in which case nothing happens. + self.callback = callback + #: the list of parameters for this command in the order they + #: should show up in the help page and execute. Eager parameters + #: will automatically be handled before non eager ones. + self.params = params or [] + # if a form feed (page break) is found in the help text, truncate help + # text to the content preceding the first form feed + if help and '\f' in help: + help = help.split('\f', 1)[0] + self.help = help + self.epilog = epilog + self.options_metavar = options_metavar + self.short_help = short_help + self.add_help_option = add_help_option + self.hidden = hidden + self.deprecated = deprecated + + def get_usage(self, ctx): + formatter = ctx.make_formatter() + self.format_usage(ctx, formatter) + return formatter.getvalue().rstrip('\n') + + def get_params(self, ctx): + rv = self.params + help_option = self.get_help_option(ctx) + if help_option is not None: + rv = rv + [help_option] + return rv + + def format_usage(self, ctx, formatter): + """Writes the usage line into the formatter.""" + pieces = self.collect_usage_pieces(ctx) + formatter.write_usage(ctx.command_path, ' '.join(pieces)) + + def collect_usage_pieces(self, ctx): + """Returns all the pieces that go into the usage line and returns + it as a list of strings. + """ + rv = [self.options_metavar] + for param in self.get_params(ctx): + rv.extend(param.get_usage_pieces(ctx)) + return rv + + def get_help_option_names(self, ctx): + """Returns the names for the help option.""" + all_names = set(ctx.help_option_names) + for param in self.params: + all_names.difference_update(param.opts) + all_names.difference_update(param.secondary_opts) + return all_names + + def get_help_option(self, ctx): + """Returns the help option object.""" + help_options = self.get_help_option_names(ctx) + if not help_options or not self.add_help_option: + return + + def show_help(ctx, param, value): + if value and not ctx.resilient_parsing: + echo(ctx.get_help(), color=ctx.color) + ctx.exit() + return Option(help_options, is_flag=True, + is_eager=True, expose_value=False, + callback=show_help, + help='Show this message and exit.') + + def make_parser(self, ctx): + """Creates the underlying option parser for this command.""" + parser = OptionParser(ctx) + for param in self.get_params(ctx): + param.add_to_parser(parser, ctx) + return parser + + def get_help(self, ctx): + """Formats the help into a string and returns it. This creates a + formatter and will call into the following formatting methods: + """ + formatter = ctx.make_formatter() + self.format_help(ctx, formatter) + return formatter.getvalue().rstrip('\n') + + def get_short_help_str(self, limit=45): + """Gets short help for the command or makes it by shortening the long help string.""" + return self.short_help or self.help and make_default_short_help(self.help, limit) or '' + + def format_help(self, ctx, formatter): + """Writes the help into the formatter if it exists. + + This calls into the following methods: + + - :meth:`format_usage` + - :meth:`format_help_text` + - :meth:`format_options` + - :meth:`format_epilog` + """ + self.format_usage(ctx, formatter) + self.format_help_text(ctx, formatter) + self.format_options(ctx, formatter) + self.format_epilog(ctx, formatter) + + def format_help_text(self, ctx, formatter): + """Writes the help text to the formatter if it exists.""" + if self.help: + formatter.write_paragraph() + with formatter.indentation(): + help_text = self.help + if self.deprecated: + help_text += DEPRECATED_HELP_NOTICE + formatter.write_text(help_text) + elif self.deprecated: + formatter.write_paragraph() + with formatter.indentation(): + formatter.write_text(DEPRECATED_HELP_NOTICE) + + def format_options(self, ctx, formatter): + """Writes all the options into the formatter if they exist.""" + opts = [] + for param in self.get_params(ctx): + rv = param.get_help_record(ctx) + if rv is not None: + opts.append(rv) + + if opts: + with formatter.section('Options'): + formatter.write_dl(opts) + + def format_epilog(self, ctx, formatter): + """Writes the epilog into the formatter if it exists.""" + if self.epilog: + formatter.write_paragraph() + with formatter.indentation(): + formatter.write_text(self.epilog) + + def parse_args(self, ctx, args): + parser = self.make_parser(ctx) + opts, args, param_order = parser.parse_args(args=args) + + for param in iter_params_for_processing( + param_order, self.get_params(ctx)): + value, args = param.handle_parse_result(ctx, opts, args) + + if args and not ctx.allow_extra_args and not ctx.resilient_parsing: + ctx.fail('Got unexpected extra argument%s (%s)' + % (len(args) != 1 and 's' or '', + ' '.join(map(make_str, args)))) + + ctx.args = args + return args + + def invoke(self, ctx): + """Given a context, this invokes the attached callback (if it exists) + in the right way. + """ + _maybe_show_deprecated_notice(self) + if self.callback is not None: + return ctx.invoke(self.callback, **ctx.params) + + +class MultiCommand(Command): + """A multi command is the basic implementation of a command that + dispatches to subcommands. The most common version is the + :class:`Group`. + + :param invoke_without_command: this controls how the multi command itself + is invoked. By default it's only invoked + if a subcommand is provided. + :param no_args_is_help: this controls what happens if no arguments are + provided. This option is enabled by default if + `invoke_without_command` is disabled or disabled + if it's enabled. If enabled this will add + ``--help`` as argument if no arguments are + passed. + :param subcommand_metavar: the string that is used in the documentation + to indicate the subcommand place. + :param chain: if this is set to `True` chaining of multiple subcommands + is enabled. This restricts the form of commands in that + they cannot have optional arguments but it allows + multiple commands to be chained together. + :param result_callback: the result callback to attach to this multi + command. + """ + allow_extra_args = True + allow_interspersed_args = False + + def __init__(self, name=None, invoke_without_command=False, + no_args_is_help=None, subcommand_metavar=None, + chain=False, result_callback=None, **attrs): + Command.__init__(self, name, **attrs) + if no_args_is_help is None: + no_args_is_help = not invoke_without_command + self.no_args_is_help = no_args_is_help + self.invoke_without_command = invoke_without_command + if subcommand_metavar is None: + if chain: + subcommand_metavar = SUBCOMMANDS_METAVAR + else: + subcommand_metavar = SUBCOMMAND_METAVAR + self.subcommand_metavar = subcommand_metavar + self.chain = chain + #: The result callback that is stored. This can be set or + #: overridden with the :func:`resultcallback` decorator. + self.result_callback = result_callback + + if self.chain: + for param in self.params: + if isinstance(param, Argument) and not param.required: + raise RuntimeError('Multi commands in chain mode cannot ' + 'have optional arguments.') + + def collect_usage_pieces(self, ctx): + rv = Command.collect_usage_pieces(self, ctx) + rv.append(self.subcommand_metavar) + return rv + + def format_options(self, ctx, formatter): + Command.format_options(self, ctx, formatter) + self.format_commands(ctx, formatter) + + def resultcallback(self, replace=False): + """Adds a result callback to the chain command. By default if a + result callback is already registered this will chain them but + this can be disabled with the `replace` parameter. The result + callback is invoked with the return value of the subcommand + (or the list of return values from all subcommands if chaining + is enabled) as well as the parameters as they would be passed + to the main callback. + + Example:: + + @click.group() + @click.option('-i', '--input', default=23) + def cli(input): + return 42 + + @cli.resultcallback() + def process_result(result, input): + return result + input + + .. versionadded:: 3.0 + + :param replace: if set to `True` an already existing result + callback will be removed. + """ + def decorator(f): + old_callback = self.result_callback + if old_callback is None or replace: + self.result_callback = f + return f + def function(__value, *args, **kwargs): + return f(old_callback(__value, *args, **kwargs), + *args, **kwargs) + self.result_callback = rv = update_wrapper(function, f) + return rv + return decorator + + def format_commands(self, ctx, formatter): + """Extra format methods for multi methods that adds all the commands + after the options. + """ + commands = [] + for subcommand in self.list_commands(ctx): + cmd = self.get_command(ctx, subcommand) + # What is this, the tool lied about a command. Ignore it + if cmd is None: + continue + if cmd.hidden: + continue + + commands.append((subcommand, cmd)) + + # allow for 3 times the default spacing + if len(commands): + limit = formatter.width - 6 - max(len(cmd[0]) for cmd in commands) + + rows = [] + for subcommand, cmd in commands: + help = cmd.get_short_help_str(limit) + rows.append((subcommand, help)) + + if rows: + with formatter.section('Commands'): + formatter.write_dl(rows) + + def parse_args(self, ctx, args): + if not args and self.no_args_is_help and not ctx.resilient_parsing: + echo(ctx.get_help(), color=ctx.color) + ctx.exit() + + rest = Command.parse_args(self, ctx, args) + if self.chain: + ctx.protected_args = rest + ctx.args = [] + elif rest: + ctx.protected_args, ctx.args = rest[:1], rest[1:] + + return ctx.args + + def invoke(self, ctx): + def _process_result(value): + if self.result_callback is not None: + value = ctx.invoke(self.result_callback, value, + **ctx.params) + return value + + if not ctx.protected_args: + # If we are invoked without command the chain flag controls + # how this happens. If we are not in chain mode, the return + # value here is the return value of the command. + # If however we are in chain mode, the return value is the + # return value of the result processor invoked with an empty + # list (which means that no subcommand actually was executed). + if self.invoke_without_command: + if not self.chain: + return Command.invoke(self, ctx) + with ctx: + Command.invoke(self, ctx) + return _process_result([]) + ctx.fail('Missing command.') + + # Fetch args back out + args = ctx.protected_args + ctx.args + ctx.args = [] + ctx.protected_args = [] + + # If we're not in chain mode, we only allow the invocation of a + # single command but we also inform the current context about the + # name of the command to invoke. + if not self.chain: + # Make sure the context is entered so we do not clean up + # resources until the result processor has worked. + with ctx: + cmd_name, cmd, args = self.resolve_command(ctx, args) + ctx.invoked_subcommand = cmd_name + Command.invoke(self, ctx) + sub_ctx = cmd.make_context(cmd_name, args, parent=ctx) + with sub_ctx: + return _process_result(sub_ctx.command.invoke(sub_ctx)) + + # In chain mode we create the contexts step by step, but after the + # base command has been invoked. Because at that point we do not + # know the subcommands yet, the invoked subcommand attribute is + # set to ``*`` to inform the command that subcommands are executed + # but nothing else. + with ctx: + ctx.invoked_subcommand = args and '*' or None + Command.invoke(self, ctx) + + # Otherwise we make every single context and invoke them in a + # chain. In that case the return value to the result processor + # is the list of all invoked subcommand's results. + contexts = [] + while args: + cmd_name, cmd, args = self.resolve_command(ctx, args) + sub_ctx = cmd.make_context(cmd_name, args, parent=ctx, + allow_extra_args=True, + allow_interspersed_args=False) + contexts.append(sub_ctx) + args, sub_ctx.args = sub_ctx.args, [] + + rv = [] + for sub_ctx in contexts: + with sub_ctx: + rv.append(sub_ctx.command.invoke(sub_ctx)) + return _process_result(rv) + + def resolve_command(self, ctx, args): + cmd_name = make_str(args[0]) + original_cmd_name = cmd_name + + # Get the command + cmd = self.get_command(ctx, cmd_name) + + # If we can't find the command but there is a normalization + # function available, we try with that one. + if cmd is None and ctx.token_normalize_func is not None: + cmd_name = ctx.token_normalize_func(cmd_name) + cmd = self.get_command(ctx, cmd_name) + + # If we don't find the command we want to show an error message + # to the user that it was not provided. However, there is + # something else we should do: if the first argument looks like + # an option we want to kick off parsing again for arguments to + # resolve things like --help which now should go to the main + # place. + if cmd is None and not ctx.resilient_parsing: + if split_opt(cmd_name)[0]: + self.parse_args(ctx, ctx.args) + ctx.fail('No such command "%s".' % original_cmd_name) + + return cmd_name, cmd, args[1:] + + def get_command(self, ctx, cmd_name): + """Given a context and a command name, this returns a + :class:`Command` object if it exists or returns `None`. + """ + raise NotImplementedError() + + def list_commands(self, ctx): + """Returns a list of subcommand names in the order they should + appear. + """ + return [] + + +class Group(MultiCommand): + """A group allows a command to have subcommands attached. This is the + most common way to implement nesting in Click. + + :param commands: a dictionary of commands. + """ + + def __init__(self, name=None, commands=None, **attrs): + MultiCommand.__init__(self, name, **attrs) + #: the registered subcommands by their exported names. + self.commands = commands or {} + + def add_command(self, cmd, name=None): + """Registers another :class:`Command` with this group. If the name + is not provided, the name of the command is used. + """ + name = name or cmd.name + if name is None: + raise TypeError('Command has no name.') + _check_multicommand(self, name, cmd, register=True) + self.commands[name] = cmd + + def command(self, *args, **kwargs): + """A shortcut decorator for declaring and attaching a command to + the group. This takes the same arguments as :func:`command` but + immediately registers the created command with this instance by + calling into :meth:`add_command`. + """ + def decorator(f): + cmd = command(*args, **kwargs)(f) + self.add_command(cmd) + return cmd + return decorator + + def group(self, *args, **kwargs): + """A shortcut decorator for declaring and attaching a group to + the group. This takes the same arguments as :func:`group` but + immediately registers the created command with this instance by + calling into :meth:`add_command`. + """ + def decorator(f): + cmd = group(*args, **kwargs)(f) + self.add_command(cmd) + return cmd + return decorator + + def get_command(self, ctx, cmd_name): + return self.commands.get(cmd_name) + + def list_commands(self, ctx): + return sorted(self.commands) + + +class CommandCollection(MultiCommand): + """A command collection is a multi command that merges multiple multi + commands together into one. This is a straightforward implementation + that accepts a list of different multi commands as sources and + provides all the commands for each of them. + """ + + def __init__(self, name=None, sources=None, **attrs): + MultiCommand.__init__(self, name, **attrs) + #: The list of registered multi commands. + self.sources = sources or [] + + def add_source(self, multi_cmd): + """Adds a new multi command to the chain dispatcher.""" + self.sources.append(multi_cmd) + + def get_command(self, ctx, cmd_name): + for source in self.sources: + rv = source.get_command(ctx, cmd_name) + if rv is not None: + if self.chain: + _check_multicommand(self, cmd_name, rv) + return rv + + def list_commands(self, ctx): + rv = set() + for source in self.sources: + rv.update(source.list_commands(ctx)) + return sorted(rv) + + +class Parameter(object): + r"""A parameter to a command comes in two versions: they are either + :class:`Option`\s or :class:`Argument`\s. Other subclasses are currently + not supported by design as some of the internals for parsing are + intentionally not finalized. + + Some settings are supported by both options and arguments. + + .. versionchanged:: 2.0 + Changed signature for parameter callback to also be passed the + parameter. In Click 2.0, the old callback format will still work, + but it will raise a warning to give you change to migrate the + code easier. + + :param param_decls: the parameter declarations for this option or + argument. This is a list of flags or argument + names. + :param type: the type that should be used. Either a :class:`ParamType` + or a Python type. The later is converted into the former + automatically if supported. + :param required: controls if this is optional or not. + :param default: the default value if omitted. This can also be a callable, + in which case it's invoked when the default is needed + without any arguments. + :param callback: a callback that should be executed after the parameter + was matched. This is called as ``fn(ctx, param, + value)`` and needs to return the value. Before Click + 2.0, the signature was ``(ctx, value)``. + :param nargs: the number of arguments to match. If not ``1`` the return + value is a tuple instead of single value. The default for + nargs is ``1`` (except if the type is a tuple, then it's + the arity of the tuple). + :param metavar: how the value is represented in the help page. + :param expose_value: if this is `True` then the value is passed onwards + to the command callback and stored on the context, + otherwise it's skipped. + :param is_eager: eager values are processed before non eager ones. This + should not be set for arguments or it will inverse the + order of processing. + :param envvar: a string or list of strings that are environment variables + that should be checked. + """ + param_type_name = 'parameter' + + def __init__(self, param_decls=None, type=None, required=False, + default=None, callback=None, nargs=None, metavar=None, + expose_value=True, is_eager=False, envvar=None, + autocompletion=None): + self.name, self.opts, self.secondary_opts = \ + self._parse_decls(param_decls or (), expose_value) + + self.type = convert_type(type, default) + + # Default nargs to what the type tells us if we have that + # information available. + if nargs is None: + if self.type.is_composite: + nargs = self.type.arity + else: + nargs = 1 + + self.required = required + self.callback = callback + self.nargs = nargs + self.multiple = False + self.expose_value = expose_value + self.default = default + self.is_eager = is_eager + self.metavar = metavar + self.envvar = envvar + self.autocompletion = autocompletion + + @property + def human_readable_name(self): + """Returns the human readable name of this parameter. This is the + same as the name for options, but the metavar for arguments. + """ + return self.name + + def make_metavar(self): + if self.metavar is not None: + return self.metavar + metavar = self.type.get_metavar(self) + if metavar is None: + metavar = self.type.name.upper() + if self.nargs != 1: + metavar += '...' + return metavar + + def get_default(self, ctx): + """Given a context variable this calculates the default value.""" + # Otherwise go with the regular default. + if callable(self.default): + rv = self.default() + else: + rv = self.default + return self.type_cast_value(ctx, rv) + + def add_to_parser(self, parser, ctx): + pass + + def consume_value(self, ctx, opts): + value = opts.get(self.name) + if value is None: + value = self.value_from_envvar(ctx) + if value is None: + value = ctx.lookup_default(self.name) + return value + + def type_cast_value(self, ctx, value): + """Given a value this runs it properly through the type system. + This automatically handles things like `nargs` and `multiple` as + well as composite types. + """ + if self.type.is_composite: + if self.nargs <= 1: + raise TypeError('Attempted to invoke composite type ' + 'but nargs has been set to %s. This is ' + 'not supported; nargs needs to be set to ' + 'a fixed value > 1.' % self.nargs) + if self.multiple: + return tuple(self.type(x or (), self, ctx) for x in value or ()) + return self.type(value or (), self, ctx) + + def _convert(value, level): + if level == 0: + return self.type(value, self, ctx) + return tuple(_convert(x, level - 1) for x in value or ()) + return _convert(value, (self.nargs != 1) + bool(self.multiple)) + + def process_value(self, ctx, value): + """Given a value and context this runs the logic to convert the + value as necessary. + """ + # If the value we were given is None we do nothing. This way + # code that calls this can easily figure out if something was + # not provided. Otherwise it would be converted into an empty + # tuple for multiple invocations which is inconvenient. + if value is not None: + return self.type_cast_value(ctx, value) + + def value_is_missing(self, value): + if value is None: + return True + if (self.nargs != 1 or self.multiple) and value == (): + return True + return False + + def full_process_value(self, ctx, value): + value = self.process_value(ctx, value) + + if value is None and not ctx.resilient_parsing: + value = self.get_default(ctx) + + if self.required and self.value_is_missing(value): + raise MissingParameter(ctx=ctx, param=self) + + return value + + def resolve_envvar_value(self, ctx): + if self.envvar is None: + return + if isinstance(self.envvar, (tuple, list)): + for envvar in self.envvar: + rv = os.environ.get(envvar) + if rv is not None: + return rv + else: + return os.environ.get(self.envvar) + + def value_from_envvar(self, ctx): + rv = self.resolve_envvar_value(ctx) + if rv is not None and self.nargs != 1: + rv = self.type.split_envvar_value(rv) + return rv + + def handle_parse_result(self, ctx, opts, args): + with augment_usage_errors(ctx, param=self): + value = self.consume_value(ctx, opts) + try: + value = self.full_process_value(ctx, value) + except Exception: + if not ctx.resilient_parsing: + raise + value = None + if self.callback is not None: + try: + value = invoke_param_callback( + self.callback, ctx, self, value) + except Exception: + if not ctx.resilient_parsing: + raise + + if self.expose_value: + ctx.params[self.name] = value + return value, args + + def get_help_record(self, ctx): + pass + + def get_usage_pieces(self, ctx): + return [] + + def get_error_hint(self, ctx): + """Get a stringified version of the param for use in error messages to + indicate which param caused the error. + """ + hint_list = self.opts or [self.human_readable_name] + return ' / '.join('"%s"' % x for x in hint_list) + + +class Option(Parameter): + """Options are usually optional values on the command line and + have some extra features that arguments don't have. + + All other parameters are passed onwards to the parameter constructor. + + :param show_default: controls if the default value should be shown on the + help page. Normally, defaults are not shown. If this + value is a string, it shows the string instead of the + value. This is particularly useful for dynamic options. + :param show_envvar: controls if an environment variable should be shown on + the help page. Normally, environment variables + are not shown. + :param prompt: if set to `True` or a non empty string then the user will be + prompted for input. If set to `True` the prompt will be the + option name capitalized. + :param confirmation_prompt: if set then the value will need to be confirmed + if it was prompted for. + :param hide_input: if this is `True` then the input on the prompt will be + hidden from the user. This is useful for password + input. + :param is_flag: forces this option to act as a flag. The default is + auto detection. + :param flag_value: which value should be used for this flag if it's + enabled. This is set to a boolean automatically if + the option string contains a slash to mark two options. + :param multiple: if this is set to `True` then the argument is accepted + multiple times and recorded. This is similar to ``nargs`` + in how it works but supports arbitrary number of + arguments. + :param count: this flag makes an option increment an integer. + :param allow_from_autoenv: if this is enabled then the value of this + parameter will be pulled from an environment + variable in case a prefix is defined on the + context. + :param help: the help string. + :param hidden: hide this option from help outputs. + """ + param_type_name = 'option' + + def __init__(self, param_decls=None, show_default=False, + prompt=False, confirmation_prompt=False, + hide_input=False, is_flag=None, flag_value=None, + multiple=False, count=False, allow_from_autoenv=True, + type=None, help=None, hidden=False, show_choices=True, + show_envvar=False, **attrs): + default_is_missing = attrs.get('default', _missing) is _missing + Parameter.__init__(self, param_decls, type=type, **attrs) + + if prompt is True: + prompt_text = self.name.replace('_', ' ').capitalize() + elif prompt is False: + prompt_text = None + else: + prompt_text = prompt + self.prompt = prompt_text + self.confirmation_prompt = confirmation_prompt + self.hide_input = hide_input + self.hidden = hidden + + # Flags + if is_flag is None: + if flag_value is not None: + is_flag = True + else: + is_flag = bool(self.secondary_opts) + if is_flag and default_is_missing: + self.default = False + if flag_value is None: + flag_value = not self.default + self.is_flag = is_flag + self.flag_value = flag_value + if self.is_flag and isinstance(self.flag_value, bool) \ + and type is None: + self.type = BOOL + self.is_bool_flag = True + else: + self.is_bool_flag = False + + # Counting + self.count = count + if count: + if type is None: + self.type = IntRange(min=0) + if default_is_missing: + self.default = 0 + + self.multiple = multiple + self.allow_from_autoenv = allow_from_autoenv + self.help = help + self.show_default = show_default + self.show_choices = show_choices + self.show_envvar = show_envvar + + # Sanity check for stuff we don't support + if __debug__: + if self.nargs < 0: + raise TypeError('Options cannot have nargs < 0') + if self.prompt and self.is_flag and not self.is_bool_flag: + raise TypeError('Cannot prompt for flags that are not bools.') + if not self.is_bool_flag and self.secondary_opts: + raise TypeError('Got secondary option for non boolean flag.') + if self.is_bool_flag and self.hide_input \ + and self.prompt is not None: + raise TypeError('Hidden input does not work with boolean ' + 'flag prompts.') + if self.count: + if self.multiple: + raise TypeError('Options cannot be multiple and count ' + 'at the same time.') + elif self.is_flag: + raise TypeError('Options cannot be count and flags at ' + 'the same time.') + + def _parse_decls(self, decls, expose_value): + opts = [] + secondary_opts = [] + name = None + possible_names = [] + + for decl in decls: + if isidentifier(decl): + if name is not None: + raise TypeError('Name defined twice') + name = decl + else: + split_char = decl[:1] == '/' and ';' or '/' + if split_char in decl: + first, second = decl.split(split_char, 1) + first = first.rstrip() + if first: + possible_names.append(split_opt(first)) + opts.append(first) + second = second.lstrip() + if second: + secondary_opts.append(second.lstrip()) + else: + possible_names.append(split_opt(decl)) + opts.append(decl) + + if name is None and possible_names: + possible_names.sort(key=lambda x: -len(x[0])) # group long options first + name = possible_names[0][1].replace('-', '_').lower() + if not isidentifier(name): + name = None + + if name is None: + if not expose_value: + return None, opts, secondary_opts + raise TypeError('Could not determine name for option') + + if not opts and not secondary_opts: + raise TypeError('No options defined but a name was passed (%s). ' + 'Did you mean to declare an argument instead ' + 'of an option?' % name) + + return name, opts, secondary_opts + + def add_to_parser(self, parser, ctx): + kwargs = { + 'dest': self.name, + 'nargs': self.nargs, + 'obj': self, + } + + if self.multiple: + action = 'append' + elif self.count: + action = 'count' + else: + action = 'store' + + if self.is_flag: + kwargs.pop('nargs', None) + if self.is_bool_flag and self.secondary_opts: + parser.add_option(self.opts, action=action + '_const', + const=True, **kwargs) + parser.add_option(self.secondary_opts, action=action + + '_const', const=False, **kwargs) + else: + parser.add_option(self.opts, action=action + '_const', + const=self.flag_value, + **kwargs) + else: + kwargs['action'] = action + parser.add_option(self.opts, **kwargs) + + def get_help_record(self, ctx): + if self.hidden: + return + any_prefix_is_slash = [] + + def _write_opts(opts): + rv, any_slashes = join_options(opts) + if any_slashes: + any_prefix_is_slash[:] = [True] + if not self.is_flag and not self.count: + rv += ' ' + self.make_metavar() + return rv + + rv = [_write_opts(self.opts)] + if self.secondary_opts: + rv.append(_write_opts(self.secondary_opts)) + + help = self.help or '' + extra = [] + if self.show_envvar: + envvar = self.envvar + if envvar is None: + if self.allow_from_autoenv and \ + ctx.auto_envvar_prefix is not None: + envvar = '%s_%s' % (ctx.auto_envvar_prefix, self.name.upper()) + if envvar is not None: + extra.append('env var: %s' % ( + ', '.join('%s' % d for d in envvar) + if isinstance(envvar, (list, tuple)) + else envvar, )) + if self.default is not None and self.show_default: + if isinstance(self.show_default, string_types): + default_string = '({})'.format(self.show_default) + elif isinstance(self.default, (list, tuple)): + default_string = ', '.join('%s' % d for d in self.default) + elif inspect.isfunction(self.default): + default_string = "(dynamic)" + else: + default_string = self.default + extra.append('default: {}'.format(default_string)) + + if self.required: + extra.append('required') + if extra: + help = '%s[%s]' % (help and help + ' ' or '', '; '.join(extra)) + + return ((any_prefix_is_slash and '; ' or ' / ').join(rv), help) + + def get_default(self, ctx): + # If we're a non boolean flag out default is more complex because + # we need to look at all flags in the same group to figure out + # if we're the the default one in which case we return the flag + # value as default. + if self.is_flag and not self.is_bool_flag: + for param in ctx.command.params: + if param.name == self.name and param.default: + return param.flag_value + return None + return Parameter.get_default(self, ctx) + + def prompt_for_value(self, ctx): + """This is an alternative flow that can be activated in the full + value processing if a value does not exist. It will prompt the + user until a valid value exists and then returns the processed + value as result. + """ + # Calculate the default before prompting anything to be stable. + default = self.get_default(ctx) + + # If this is a prompt for a flag we need to handle this + # differently. + if self.is_bool_flag: + return confirm(self.prompt, default) + + return prompt(self.prompt, default=default, type=self.type, + hide_input=self.hide_input, show_choices=self.show_choices, + confirmation_prompt=self.confirmation_prompt, + value_proc=lambda x: self.process_value(ctx, x)) + + def resolve_envvar_value(self, ctx): + rv = Parameter.resolve_envvar_value(self, ctx) + if rv is not None: + return rv + if self.allow_from_autoenv and \ + ctx.auto_envvar_prefix is not None: + envvar = '%s_%s' % (ctx.auto_envvar_prefix, self.name.upper()) + return os.environ.get(envvar) + + def value_from_envvar(self, ctx): + rv = self.resolve_envvar_value(ctx) + if rv is None: + return None + value_depth = (self.nargs != 1) + bool(self.multiple) + if value_depth > 0 and rv is not None: + rv = self.type.split_envvar_value(rv) + if self.multiple and self.nargs != 1: + rv = batch(rv, self.nargs) + return rv + + def full_process_value(self, ctx, value): + if value is None and self.prompt is not None \ + and not ctx.resilient_parsing: + return self.prompt_for_value(ctx) + return Parameter.full_process_value(self, ctx, value) + + +class Argument(Parameter): + """Arguments are positional parameters to a command. They generally + provide fewer features than options but can have infinite ``nargs`` + and are required by default. + + All parameters are passed onwards to the parameter constructor. + """ + param_type_name = 'argument' + + def __init__(self, param_decls, required=None, **attrs): + if required is None: + if attrs.get('default') is not None: + required = False + else: + required = attrs.get('nargs', 1) > 0 + Parameter.__init__(self, param_decls, required=required, **attrs) + if self.default is not None and self.nargs < 0: + raise TypeError('nargs=-1 in combination with a default value ' + 'is not supported.') + + @property + def human_readable_name(self): + if self.metavar is not None: + return self.metavar + return self.name.upper() + + def make_metavar(self): + if self.metavar is not None: + return self.metavar + var = self.type.get_metavar(self) + if not var: + var = self.name.upper() + if not self.required: + var = '[%s]' % var + if self.nargs != 1: + var += '...' + return var + + def _parse_decls(self, decls, expose_value): + if not decls: + if not expose_value: + return None, [], [] + raise TypeError('Could not determine name for argument') + if len(decls) == 1: + name = arg = decls[0] + name = name.replace('-', '_').lower() + else: + raise TypeError('Arguments take exactly one ' + 'parameter declaration, got %d' % len(decls)) + return name, [arg], [] + + def get_usage_pieces(self, ctx): + return [self.make_metavar()] + + def get_error_hint(self, ctx): + return '"%s"' % self.make_metavar() + + def add_to_parser(self, parser, ctx): + parser.add_argument(dest=self.name, nargs=self.nargs, + obj=self) + + +# Circular dependency between decorators and core +from .decorators import command, group diff --git a/venv/lib/python3.7/site-packages/click/decorators.py b/venv/lib/python3.7/site-packages/click/decorators.py new file mode 100644 index 0000000..c57c530 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/decorators.py @@ -0,0 +1,311 @@ +import sys +import inspect + +from functools import update_wrapper + +from ._compat import iteritems +from ._unicodefun import _check_for_unicode_literals +from .utils import echo +from .globals import get_current_context + + +def pass_context(f): + """Marks a callback as wanting to receive the current context + object as first argument. + """ + def new_func(*args, **kwargs): + return f(get_current_context(), *args, **kwargs) + return update_wrapper(new_func, f) + + +def pass_obj(f): + """Similar to :func:`pass_context`, but only pass the object on the + context onwards (:attr:`Context.obj`). This is useful if that object + represents the state of a nested system. + """ + def new_func(*args, **kwargs): + return f(get_current_context().obj, *args, **kwargs) + return update_wrapper(new_func, f) + + +def make_pass_decorator(object_type, ensure=False): + """Given an object type this creates a decorator that will work + similar to :func:`pass_obj` but instead of passing the object of the + current context, it will find the innermost context of type + :func:`object_type`. + + This generates a decorator that works roughly like this:: + + from functools import update_wrapper + + def decorator(f): + @pass_context + def new_func(ctx, *args, **kwargs): + obj = ctx.find_object(object_type) + return ctx.invoke(f, obj, *args, **kwargs) + return update_wrapper(new_func, f) + return decorator + + :param object_type: the type of the object to pass. + :param ensure: if set to `True`, a new object will be created and + remembered on the context if it's not there yet. + """ + def decorator(f): + def new_func(*args, **kwargs): + ctx = get_current_context() + if ensure: + obj = ctx.ensure_object(object_type) + else: + obj = ctx.find_object(object_type) + if obj is None: + raise RuntimeError('Managed to invoke callback without a ' + 'context object of type %r existing' + % object_type.__name__) + return ctx.invoke(f, obj, *args, **kwargs) + return update_wrapper(new_func, f) + return decorator + + +def _make_command(f, name, attrs, cls): + if isinstance(f, Command): + raise TypeError('Attempted to convert a callback into a ' + 'command twice.') + try: + params = f.__click_params__ + params.reverse() + del f.__click_params__ + except AttributeError: + params = [] + help = attrs.get('help') + if help is None: + help = inspect.getdoc(f) + if isinstance(help, bytes): + help = help.decode('utf-8') + else: + help = inspect.cleandoc(help) + attrs['help'] = help + _check_for_unicode_literals() + return cls(name=name or f.__name__.lower().replace('_', '-'), + callback=f, params=params, **attrs) + + +def command(name=None, cls=None, **attrs): + r"""Creates a new :class:`Command` and uses the decorated function as + callback. This will also automatically attach all decorated + :func:`option`\s and :func:`argument`\s as parameters to the command. + + The name of the command defaults to the name of the function. If you + want to change that, you can pass the intended name as the first + argument. + + All keyword arguments are forwarded to the underlying command class. + + Once decorated the function turns into a :class:`Command` instance + that can be invoked as a command line utility or be attached to a + command :class:`Group`. + + :param name: the name of the command. This defaults to the function + name with underscores replaced by dashes. + :param cls: the command class to instantiate. This defaults to + :class:`Command`. + """ + if cls is None: + cls = Command + def decorator(f): + cmd = _make_command(f, name, attrs, cls) + cmd.__doc__ = f.__doc__ + return cmd + return decorator + + +def group(name=None, **attrs): + """Creates a new :class:`Group` with a function as callback. This + works otherwise the same as :func:`command` just that the `cls` + parameter is set to :class:`Group`. + """ + attrs.setdefault('cls', Group) + return command(name, **attrs) + + +def _param_memo(f, param): + if isinstance(f, Command): + f.params.append(param) + else: + if not hasattr(f, '__click_params__'): + f.__click_params__ = [] + f.__click_params__.append(param) + + +def argument(*param_decls, **attrs): + """Attaches an argument to the command. All positional arguments are + passed as parameter declarations to :class:`Argument`; all keyword + arguments are forwarded unchanged (except ``cls``). + This is equivalent to creating an :class:`Argument` instance manually + and attaching it to the :attr:`Command.params` list. + + :param cls: the argument class to instantiate. This defaults to + :class:`Argument`. + """ + def decorator(f): + ArgumentClass = attrs.pop('cls', Argument) + _param_memo(f, ArgumentClass(param_decls, **attrs)) + return f + return decorator + + +def option(*param_decls, **attrs): + """Attaches an option to the command. All positional arguments are + passed as parameter declarations to :class:`Option`; all keyword + arguments are forwarded unchanged (except ``cls``). + This is equivalent to creating an :class:`Option` instance manually + and attaching it to the :attr:`Command.params` list. + + :param cls: the option class to instantiate. This defaults to + :class:`Option`. + """ + def decorator(f): + # Issue 926, copy attrs, so pre-defined options can re-use the same cls= + option_attrs = attrs.copy() + + if 'help' in option_attrs: + option_attrs['help'] = inspect.cleandoc(option_attrs['help']) + OptionClass = option_attrs.pop('cls', Option) + _param_memo(f, OptionClass(param_decls, **option_attrs)) + return f + return decorator + + +def confirmation_option(*param_decls, **attrs): + """Shortcut for confirmation prompts that can be ignored by passing + ``--yes`` as parameter. + + This is equivalent to decorating a function with :func:`option` with + the following parameters:: + + def callback(ctx, param, value): + if not value: + ctx.abort() + + @click.command() + @click.option('--yes', is_flag=True, callback=callback, + expose_value=False, prompt='Do you want to continue?') + def dropdb(): + pass + """ + def decorator(f): + def callback(ctx, param, value): + if not value: + ctx.abort() + attrs.setdefault('is_flag', True) + attrs.setdefault('callback', callback) + attrs.setdefault('expose_value', False) + attrs.setdefault('prompt', 'Do you want to continue?') + attrs.setdefault('help', 'Confirm the action without prompting.') + return option(*(param_decls or ('--yes',)), **attrs)(f) + return decorator + + +def password_option(*param_decls, **attrs): + """Shortcut for password prompts. + + This is equivalent to decorating a function with :func:`option` with + the following parameters:: + + @click.command() + @click.option('--password', prompt=True, confirmation_prompt=True, + hide_input=True) + def changeadmin(password): + pass + """ + def decorator(f): + attrs.setdefault('prompt', True) + attrs.setdefault('confirmation_prompt', True) + attrs.setdefault('hide_input', True) + return option(*(param_decls or ('--password',)), **attrs)(f) + return decorator + + +def version_option(version=None, *param_decls, **attrs): + """Adds a ``--version`` option which immediately ends the program + printing out the version number. This is implemented as an eager + option that prints the version and exits the program in the callback. + + :param version: the version number to show. If not provided Click + attempts an auto discovery via setuptools. + :param prog_name: the name of the program (defaults to autodetection) + :param message: custom message to show instead of the default + (``'%(prog)s, version %(version)s'``) + :param others: everything else is forwarded to :func:`option`. + """ + if version is None: + if hasattr(sys, '_getframe'): + module = sys._getframe(1).f_globals.get('__name__') + else: + module = '' + + def decorator(f): + prog_name = attrs.pop('prog_name', None) + message = attrs.pop('message', '%(prog)s, version %(version)s') + + def callback(ctx, param, value): + if not value or ctx.resilient_parsing: + return + prog = prog_name + if prog is None: + prog = ctx.find_root().info_name + ver = version + if ver is None: + try: + import pkg_resources + except ImportError: + pass + else: + for dist in pkg_resources.working_set: + scripts = dist.get_entry_map().get('console_scripts') or {} + for script_name, entry_point in iteritems(scripts): + if entry_point.module_name == module: + ver = dist.version + break + if ver is None: + raise RuntimeError('Could not determine version') + echo(message % { + 'prog': prog, + 'version': ver, + }, color=ctx.color) + ctx.exit() + + attrs.setdefault('is_flag', True) + attrs.setdefault('expose_value', False) + attrs.setdefault('is_eager', True) + attrs.setdefault('help', 'Show the version and exit.') + attrs['callback'] = callback + return option(*(param_decls or ('--version',)), **attrs)(f) + return decorator + + +def help_option(*param_decls, **attrs): + """Adds a ``--help`` option which immediately ends the program + printing out the help page. This is usually unnecessary to add as + this is added by default to all commands unless suppressed. + + Like :func:`version_option`, this is implemented as eager option that + prints in the callback and exits. + + All arguments are forwarded to :func:`option`. + """ + def decorator(f): + def callback(ctx, param, value): + if value and not ctx.resilient_parsing: + echo(ctx.get_help(), color=ctx.color) + ctx.exit() + attrs.setdefault('is_flag', True) + attrs.setdefault('expose_value', False) + attrs.setdefault('help', 'Show this message and exit.') + attrs.setdefault('is_eager', True) + attrs['callback'] = callback + return option(*(param_decls or ('--help',)), **attrs)(f) + return decorator + + +# Circular dependencies between core and decorators +from .core import Command, Group, Argument, Option diff --git a/venv/lib/python3.7/site-packages/click/exceptions.py b/venv/lib/python3.7/site-packages/click/exceptions.py new file mode 100644 index 0000000..6fa1765 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/exceptions.py @@ -0,0 +1,235 @@ +from ._compat import PY2, filename_to_ui, get_text_stderr +from .utils import echo + + +def _join_param_hints(param_hint): + if isinstance(param_hint, (tuple, list)): + return ' / '.join('"%s"' % x for x in param_hint) + return param_hint + + +class ClickException(Exception): + """An exception that Click can handle and show to the user.""" + + #: The exit code for this exception + exit_code = 1 + + def __init__(self, message): + ctor_msg = message + if PY2: + if ctor_msg is not None: + ctor_msg = ctor_msg.encode('utf-8') + Exception.__init__(self, ctor_msg) + self.message = message + + def format_message(self): + return self.message + + def __str__(self): + return self.message + + if PY2: + __unicode__ = __str__ + + def __str__(self): + return self.message.encode('utf-8') + + def show(self, file=None): + if file is None: + file = get_text_stderr() + echo('Error: %s' % self.format_message(), file=file) + + +class UsageError(ClickException): + """An internal exception that signals a usage error. This typically + aborts any further handling. + + :param message: the error message to display. + :param ctx: optionally the context that caused this error. Click will + fill in the context automatically in some situations. + """ + exit_code = 2 + + def __init__(self, message, ctx=None): + ClickException.__init__(self, message) + self.ctx = ctx + self.cmd = self.ctx and self.ctx.command or None + + def show(self, file=None): + if file is None: + file = get_text_stderr() + color = None + hint = '' + if (self.cmd is not None and + self.cmd.get_help_option(self.ctx) is not None): + hint = ('Try "%s %s" for help.\n' + % (self.ctx.command_path, self.ctx.help_option_names[0])) + if self.ctx is not None: + color = self.ctx.color + echo(self.ctx.get_usage() + '\n%s' % hint, file=file, color=color) + echo('Error: %s' % self.format_message(), file=file, color=color) + + +class BadParameter(UsageError): + """An exception that formats out a standardized error message for a + bad parameter. This is useful when thrown from a callback or type as + Click will attach contextual information to it (for instance, which + parameter it is). + + .. versionadded:: 2.0 + + :param param: the parameter object that caused this error. This can + be left out, and Click will attach this info itself + if possible. + :param param_hint: a string that shows up as parameter name. This + can be used as alternative to `param` in cases + where custom validation should happen. If it is + a string it's used as such, if it's a list then + each item is quoted and separated. + """ + + def __init__(self, message, ctx=None, param=None, + param_hint=None): + UsageError.__init__(self, message, ctx) + self.param = param + self.param_hint = param_hint + + def format_message(self): + if self.param_hint is not None: + param_hint = self.param_hint + elif self.param is not None: + param_hint = self.param.get_error_hint(self.ctx) + else: + return 'Invalid value: %s' % self.message + param_hint = _join_param_hints(param_hint) + + return 'Invalid value for %s: %s' % (param_hint, self.message) + + +class MissingParameter(BadParameter): + """Raised if click required an option or argument but it was not + provided when invoking the script. + + .. versionadded:: 4.0 + + :param param_type: a string that indicates the type of the parameter. + The default is to inherit the parameter type from + the given `param`. Valid values are ``'parameter'``, + ``'option'`` or ``'argument'``. + """ + + def __init__(self, message=None, ctx=None, param=None, + param_hint=None, param_type=None): + BadParameter.__init__(self, message, ctx, param, param_hint) + self.param_type = param_type + + def format_message(self): + if self.param_hint is not None: + param_hint = self.param_hint + elif self.param is not None: + param_hint = self.param.get_error_hint(self.ctx) + else: + param_hint = None + param_hint = _join_param_hints(param_hint) + + param_type = self.param_type + if param_type is None and self.param is not None: + param_type = self.param.param_type_name + + msg = self.message + if self.param is not None: + msg_extra = self.param.type.get_missing_message(self.param) + if msg_extra: + if msg: + msg += '. ' + msg_extra + else: + msg = msg_extra + + return 'Missing %s%s%s%s' % ( + param_type, + param_hint and ' %s' % param_hint or '', + msg and '. ' or '.', + msg or '', + ) + + +class NoSuchOption(UsageError): + """Raised if click attempted to handle an option that does not + exist. + + .. versionadded:: 4.0 + """ + + def __init__(self, option_name, message=None, possibilities=None, + ctx=None): + if message is None: + message = 'no such option: %s' % option_name + UsageError.__init__(self, message, ctx) + self.option_name = option_name + self.possibilities = possibilities + + def format_message(self): + bits = [self.message] + if self.possibilities: + if len(self.possibilities) == 1: + bits.append('Did you mean %s?' % self.possibilities[0]) + else: + possibilities = sorted(self.possibilities) + bits.append('(Possible options: %s)' % ', '.join(possibilities)) + return ' '.join(bits) + + +class BadOptionUsage(UsageError): + """Raised if an option is generally supplied but the use of the option + was incorrect. This is for instance raised if the number of arguments + for an option is not correct. + + .. versionadded:: 4.0 + + :param option_name: the name of the option being used incorrectly. + """ + + def __init__(self, option_name, message, ctx=None): + UsageError.__init__(self, message, ctx) + self.option_name = option_name + + +class BadArgumentUsage(UsageError): + """Raised if an argument is generally supplied but the use of the argument + was incorrect. This is for instance raised if the number of values + for an argument is not correct. + + .. versionadded:: 6.0 + """ + + def __init__(self, message, ctx=None): + UsageError.__init__(self, message, ctx) + + +class FileError(ClickException): + """Raised if a file cannot be opened.""" + + def __init__(self, filename, hint=None): + ui_filename = filename_to_ui(filename) + if hint is None: + hint = 'unknown error' + ClickException.__init__(self, hint) + self.ui_filename = ui_filename + self.filename = filename + + def format_message(self): + return 'Could not open file %s: %s' % (self.ui_filename, self.message) + + +class Abort(RuntimeError): + """An internal signalling exception that signals Click to abort.""" + + +class Exit(RuntimeError): + """An exception that indicates that the application should exit with some + status code. + + :param code: the status code to exit with. + """ + def __init__(self, code=0): + self.exit_code = code diff --git a/venv/lib/python3.7/site-packages/click/formatting.py b/venv/lib/python3.7/site-packages/click/formatting.py new file mode 100644 index 0000000..a3d6a4d --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/formatting.py @@ -0,0 +1,256 @@ +from contextlib import contextmanager +from .termui import get_terminal_size +from .parser import split_opt +from ._compat import term_len + + +# Can force a width. This is used by the test system +FORCED_WIDTH = None + + +def measure_table(rows): + widths = {} + for row in rows: + for idx, col in enumerate(row): + widths[idx] = max(widths.get(idx, 0), term_len(col)) + return tuple(y for x, y in sorted(widths.items())) + + +def iter_rows(rows, col_count): + for row in rows: + row = tuple(row) + yield row + ('',) * (col_count - len(row)) + + +def wrap_text(text, width=78, initial_indent='', subsequent_indent='', + preserve_paragraphs=False): + """A helper function that intelligently wraps text. By default, it + assumes that it operates on a single paragraph of text but if the + `preserve_paragraphs` parameter is provided it will intelligently + handle paragraphs (defined by two empty lines). + + If paragraphs are handled, a paragraph can be prefixed with an empty + line containing the ``\\b`` character (``\\x08``) to indicate that + no rewrapping should happen in that block. + + :param text: the text that should be rewrapped. + :param width: the maximum width for the text. + :param initial_indent: the initial indent that should be placed on the + first line as a string. + :param subsequent_indent: the indent string that should be placed on + each consecutive line. + :param preserve_paragraphs: if this flag is set then the wrapping will + intelligently handle paragraphs. + """ + from ._textwrap import TextWrapper + text = text.expandtabs() + wrapper = TextWrapper(width, initial_indent=initial_indent, + subsequent_indent=subsequent_indent, + replace_whitespace=False) + if not preserve_paragraphs: + return wrapper.fill(text) + + p = [] + buf = [] + indent = None + + def _flush_par(): + if not buf: + return + if buf[0].strip() == '\b': + p.append((indent or 0, True, '\n'.join(buf[1:]))) + else: + p.append((indent or 0, False, ' '.join(buf))) + del buf[:] + + for line in text.splitlines(): + if not line: + _flush_par() + indent = None + else: + if indent is None: + orig_len = term_len(line) + line = line.lstrip() + indent = orig_len - term_len(line) + buf.append(line) + _flush_par() + + rv = [] + for indent, raw, text in p: + with wrapper.extra_indent(' ' * indent): + if raw: + rv.append(wrapper.indent_only(text)) + else: + rv.append(wrapper.fill(text)) + + return '\n\n'.join(rv) + + +class HelpFormatter(object): + """This class helps with formatting text-based help pages. It's + usually just needed for very special internal cases, but it's also + exposed so that developers can write their own fancy outputs. + + At present, it always writes into memory. + + :param indent_increment: the additional increment for each level. + :param width: the width for the text. This defaults to the terminal + width clamped to a maximum of 78. + """ + + def __init__(self, indent_increment=2, width=None, max_width=None): + self.indent_increment = indent_increment + if max_width is None: + max_width = 80 + if width is None: + width = FORCED_WIDTH + if width is None: + width = max(min(get_terminal_size()[0], max_width) - 2, 50) + self.width = width + self.current_indent = 0 + self.buffer = [] + + def write(self, string): + """Writes a unicode string into the internal buffer.""" + self.buffer.append(string) + + def indent(self): + """Increases the indentation.""" + self.current_indent += self.indent_increment + + def dedent(self): + """Decreases the indentation.""" + self.current_indent -= self.indent_increment + + def write_usage(self, prog, args='', prefix='Usage: '): + """Writes a usage line into the buffer. + + :param prog: the program name. + :param args: whitespace separated list of arguments. + :param prefix: the prefix for the first line. + """ + usage_prefix = '%*s%s ' % (self.current_indent, prefix, prog) + text_width = self.width - self.current_indent + + if text_width >= (term_len(usage_prefix) + 20): + # The arguments will fit to the right of the prefix. + indent = ' ' * term_len(usage_prefix) + self.write(wrap_text(args, text_width, + initial_indent=usage_prefix, + subsequent_indent=indent)) + else: + # The prefix is too long, put the arguments on the next line. + self.write(usage_prefix) + self.write('\n') + indent = ' ' * (max(self.current_indent, term_len(prefix)) + 4) + self.write(wrap_text(args, text_width, + initial_indent=indent, + subsequent_indent=indent)) + + self.write('\n') + + def write_heading(self, heading): + """Writes a heading into the buffer.""" + self.write('%*s%s:\n' % (self.current_indent, '', heading)) + + def write_paragraph(self): + """Writes a paragraph into the buffer.""" + if self.buffer: + self.write('\n') + + def write_text(self, text): + """Writes re-indented text into the buffer. This rewraps and + preserves paragraphs. + """ + text_width = max(self.width - self.current_indent, 11) + indent = ' ' * self.current_indent + self.write(wrap_text(text, text_width, + initial_indent=indent, + subsequent_indent=indent, + preserve_paragraphs=True)) + self.write('\n') + + def write_dl(self, rows, col_max=30, col_spacing=2): + """Writes a definition list into the buffer. This is how options + and commands are usually formatted. + + :param rows: a list of two item tuples for the terms and values. + :param col_max: the maximum width of the first column. + :param col_spacing: the number of spaces between the first and + second column. + """ + rows = list(rows) + widths = measure_table(rows) + if len(widths) != 2: + raise TypeError('Expected two columns for definition list') + + first_col = min(widths[0], col_max) + col_spacing + + for first, second in iter_rows(rows, len(widths)): + self.write('%*s%s' % (self.current_indent, '', first)) + if not second: + self.write('\n') + continue + if term_len(first) <= first_col - col_spacing: + self.write(' ' * (first_col - term_len(first))) + else: + self.write('\n') + self.write(' ' * (first_col + self.current_indent)) + + text_width = max(self.width - first_col - 2, 10) + lines = iter(wrap_text(second, text_width).splitlines()) + if lines: + self.write(next(lines) + '\n') + for line in lines: + self.write('%*s%s\n' % ( + first_col + self.current_indent, '', line)) + else: + self.write('\n') + + @contextmanager + def section(self, name): + """Helpful context manager that writes a paragraph, a heading, + and the indents. + + :param name: the section name that is written as heading. + """ + self.write_paragraph() + self.write_heading(name) + self.indent() + try: + yield + finally: + self.dedent() + + @contextmanager + def indentation(self): + """A context manager that increases the indentation.""" + self.indent() + try: + yield + finally: + self.dedent() + + def getvalue(self): + """Returns the buffer contents.""" + return ''.join(self.buffer) + + +def join_options(options): + """Given a list of option strings this joins them in the most appropriate + way and returns them in the form ``(formatted_string, + any_prefix_is_slash)`` where the second item in the tuple is a flag that + indicates if any of the option prefixes was a slash. + """ + rv = [] + any_prefix_is_slash = False + for opt in options: + prefix = split_opt(opt)[0] + if prefix == '/': + any_prefix_is_slash = True + rv.append((len(prefix), opt)) + + rv.sort(key=lambda x: x[0]) + + rv = ', '.join(x[1] for x in rv) + return rv, any_prefix_is_slash diff --git a/venv/lib/python3.7/site-packages/click/globals.py b/venv/lib/python3.7/site-packages/click/globals.py new file mode 100644 index 0000000..843b594 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/globals.py @@ -0,0 +1,48 @@ +from threading import local + + +_local = local() + + +def get_current_context(silent=False): + """Returns the current click context. This can be used as a way to + access the current context object from anywhere. This is a more implicit + alternative to the :func:`pass_context` decorator. This function is + primarily useful for helpers such as :func:`echo` which might be + interested in changing its behavior based on the current context. + + To push the current context, :meth:`Context.scope` can be used. + + .. versionadded:: 5.0 + + :param silent: is set to `True` the return value is `None` if no context + is available. The default behavior is to raise a + :exc:`RuntimeError`. + """ + try: + return getattr(_local, 'stack')[-1] + except (AttributeError, IndexError): + if not silent: + raise RuntimeError('There is no active click context.') + + +def push_context(ctx): + """Pushes a new context to the current stack.""" + _local.__dict__.setdefault('stack', []).append(ctx) + + +def pop_context(): + """Removes the top level from the stack.""" + _local.stack.pop() + + +def resolve_color_default(color=None): + """"Internal helper to get the default value of the color flag. If a + value is passed it's returned unchanged, otherwise it's looked up from + the current context. + """ + if color is not None: + return color + ctx = get_current_context(silent=True) + if ctx is not None: + return ctx.color diff --git a/venv/lib/python3.7/site-packages/click/parser.py b/venv/lib/python3.7/site-packages/click/parser.py new file mode 100644 index 0000000..1c3ae9c --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/parser.py @@ -0,0 +1,427 @@ +# -*- coding: utf-8 -*- +""" +click.parser +~~~~~~~~~~~~ + +This module started out as largely a copy paste from the stdlib's +optparse module with the features removed that we do not need from +optparse because we implement them in Click on a higher level (for +instance type handling, help formatting and a lot more). + +The plan is to remove more and more from here over time. + +The reason this is a different module and not optparse from the stdlib +is that there are differences in 2.x and 3.x about the error messages +generated and optparse in the stdlib uses gettext for no good reason +and might cause us issues. +""" + +import re +from collections import deque +from .exceptions import UsageError, NoSuchOption, BadOptionUsage, \ + BadArgumentUsage + + +def _unpack_args(args, nargs_spec): + """Given an iterable of arguments and an iterable of nargs specifications, + it returns a tuple with all the unpacked arguments at the first index + and all remaining arguments as the second. + + The nargs specification is the number of arguments that should be consumed + or `-1` to indicate that this position should eat up all the remainders. + + Missing items are filled with `None`. + """ + args = deque(args) + nargs_spec = deque(nargs_spec) + rv = [] + spos = None + + def _fetch(c): + try: + if spos is None: + return c.popleft() + else: + return c.pop() + except IndexError: + return None + + while nargs_spec: + nargs = _fetch(nargs_spec) + if nargs == 1: + rv.append(_fetch(args)) + elif nargs > 1: + x = [_fetch(args) for _ in range(nargs)] + # If we're reversed, we're pulling in the arguments in reverse, + # so we need to turn them around. + if spos is not None: + x.reverse() + rv.append(tuple(x)) + elif nargs < 0: + if spos is not None: + raise TypeError('Cannot have two nargs < 0') + spos = len(rv) + rv.append(None) + + # spos is the position of the wildcard (star). If it's not `None`, + # we fill it with the remainder. + if spos is not None: + rv[spos] = tuple(args) + args = [] + rv[spos + 1:] = reversed(rv[spos + 1:]) + + return tuple(rv), list(args) + + +def _error_opt_args(nargs, opt): + if nargs == 1: + raise BadOptionUsage(opt, '%s option requires an argument' % opt) + raise BadOptionUsage(opt, '%s option requires %d arguments' % (opt, nargs)) + + +def split_opt(opt): + first = opt[:1] + if first.isalnum(): + return '', opt + if opt[1:2] == first: + return opt[:2], opt[2:] + return first, opt[1:] + + +def normalize_opt(opt, ctx): + if ctx is None or ctx.token_normalize_func is None: + return opt + prefix, opt = split_opt(opt) + return prefix + ctx.token_normalize_func(opt) + + +def split_arg_string(string): + """Given an argument string this attempts to split it into small parts.""" + rv = [] + for match in re.finditer(r"('([^'\\]*(?:\\.[^'\\]*)*)'" + r'|"([^"\\]*(?:\\.[^"\\]*)*)"' + r'|\S+)\s*', string, re.S): + arg = match.group().strip() + if arg[:1] == arg[-1:] and arg[:1] in '"\'': + arg = arg[1:-1].encode('ascii', 'backslashreplace') \ + .decode('unicode-escape') + try: + arg = type(string)(arg) + except UnicodeError: + pass + rv.append(arg) + return rv + + +class Option(object): + + def __init__(self, opts, dest, action=None, nargs=1, const=None, obj=None): + self._short_opts = [] + self._long_opts = [] + self.prefixes = set() + + for opt in opts: + prefix, value = split_opt(opt) + if not prefix: + raise ValueError('Invalid start character for option (%s)' + % opt) + self.prefixes.add(prefix[0]) + if len(prefix) == 1 and len(value) == 1: + self._short_opts.append(opt) + else: + self._long_opts.append(opt) + self.prefixes.add(prefix) + + if action is None: + action = 'store' + + self.dest = dest + self.action = action + self.nargs = nargs + self.const = const + self.obj = obj + + @property + def takes_value(self): + return self.action in ('store', 'append') + + def process(self, value, state): + if self.action == 'store': + state.opts[self.dest] = value + elif self.action == 'store_const': + state.opts[self.dest] = self.const + elif self.action == 'append': + state.opts.setdefault(self.dest, []).append(value) + elif self.action == 'append_const': + state.opts.setdefault(self.dest, []).append(self.const) + elif self.action == 'count': + state.opts[self.dest] = state.opts.get(self.dest, 0) + 1 + else: + raise ValueError('unknown action %r' % self.action) + state.order.append(self.obj) + + +class Argument(object): + + def __init__(self, dest, nargs=1, obj=None): + self.dest = dest + self.nargs = nargs + self.obj = obj + + def process(self, value, state): + if self.nargs > 1: + holes = sum(1 for x in value if x is None) + if holes == len(value): + value = None + elif holes != 0: + raise BadArgumentUsage('argument %s takes %d values' + % (self.dest, self.nargs)) + state.opts[self.dest] = value + state.order.append(self.obj) + + +class ParsingState(object): + + def __init__(self, rargs): + self.opts = {} + self.largs = [] + self.rargs = rargs + self.order = [] + + +class OptionParser(object): + """The option parser is an internal class that is ultimately used to + parse options and arguments. It's modelled after optparse and brings + a similar but vastly simplified API. It should generally not be used + directly as the high level Click classes wrap it for you. + + It's not nearly as extensible as optparse or argparse as it does not + implement features that are implemented on a higher level (such as + types or defaults). + + :param ctx: optionally the :class:`~click.Context` where this parser + should go with. + """ + + def __init__(self, ctx=None): + #: The :class:`~click.Context` for this parser. This might be + #: `None` for some advanced use cases. + self.ctx = ctx + #: This controls how the parser deals with interspersed arguments. + #: If this is set to `False`, the parser will stop on the first + #: non-option. Click uses this to implement nested subcommands + #: safely. + self.allow_interspersed_args = True + #: This tells the parser how to deal with unknown options. By + #: default it will error out (which is sensible), but there is a + #: second mode where it will ignore it and continue processing + #: after shifting all the unknown options into the resulting args. + self.ignore_unknown_options = False + if ctx is not None: + self.allow_interspersed_args = ctx.allow_interspersed_args + self.ignore_unknown_options = ctx.ignore_unknown_options + self._short_opt = {} + self._long_opt = {} + self._opt_prefixes = set(['-', '--']) + self._args = [] + + def add_option(self, opts, dest, action=None, nargs=1, const=None, + obj=None): + """Adds a new option named `dest` to the parser. The destination + is not inferred (unlike with optparse) and needs to be explicitly + provided. Action can be any of ``store``, ``store_const``, + ``append``, ``appnd_const`` or ``count``. + + The `obj` can be used to identify the option in the order list + that is returned from the parser. + """ + if obj is None: + obj = dest + opts = [normalize_opt(opt, self.ctx) for opt in opts] + option = Option(opts, dest, action=action, nargs=nargs, + const=const, obj=obj) + self._opt_prefixes.update(option.prefixes) + for opt in option._short_opts: + self._short_opt[opt] = option + for opt in option._long_opts: + self._long_opt[opt] = option + + def add_argument(self, dest, nargs=1, obj=None): + """Adds a positional argument named `dest` to the parser. + + The `obj` can be used to identify the option in the order list + that is returned from the parser. + """ + if obj is None: + obj = dest + self._args.append(Argument(dest=dest, nargs=nargs, obj=obj)) + + def parse_args(self, args): + """Parses positional arguments and returns ``(values, args, order)`` + for the parsed options and arguments as well as the leftover + arguments if there are any. The order is a list of objects as they + appear on the command line. If arguments appear multiple times they + will be memorized multiple times as well. + """ + state = ParsingState(args) + try: + self._process_args_for_options(state) + self._process_args_for_args(state) + except UsageError: + if self.ctx is None or not self.ctx.resilient_parsing: + raise + return state.opts, state.largs, state.order + + def _process_args_for_args(self, state): + pargs, args = _unpack_args(state.largs + state.rargs, + [x.nargs for x in self._args]) + + for idx, arg in enumerate(self._args): + arg.process(pargs[idx], state) + + state.largs = args + state.rargs = [] + + def _process_args_for_options(self, state): + while state.rargs: + arg = state.rargs.pop(0) + arglen = len(arg) + # Double dashes always handled explicitly regardless of what + # prefixes are valid. + if arg == '--': + return + elif arg[:1] in self._opt_prefixes and arglen > 1: + self._process_opts(arg, state) + elif self.allow_interspersed_args: + state.largs.append(arg) + else: + state.rargs.insert(0, arg) + return + + # Say this is the original argument list: + # [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)] + # ^ + # (we are about to process arg(i)). + # + # Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of + # [arg0, ..., arg(i-1)] (any options and their arguments will have + # been removed from largs). + # + # The while loop will usually consume 1 or more arguments per pass. + # If it consumes 1 (eg. arg is an option that takes no arguments), + # then after _process_arg() is done the situation is: + # + # largs = subset of [arg0, ..., arg(i)] + # rargs = [arg(i+1), ..., arg(N-1)] + # + # If allow_interspersed_args is false, largs will always be + # *empty* -- still a subset of [arg0, ..., arg(i-1)], but + # not a very interesting subset! + + def _match_long_opt(self, opt, explicit_value, state): + if opt not in self._long_opt: + possibilities = [word for word in self._long_opt + if word.startswith(opt)] + raise NoSuchOption(opt, possibilities=possibilities, ctx=self.ctx) + + option = self._long_opt[opt] + if option.takes_value: + # At this point it's safe to modify rargs by injecting the + # explicit value, because no exception is raised in this + # branch. This means that the inserted value will be fully + # consumed. + if explicit_value is not None: + state.rargs.insert(0, explicit_value) + + nargs = option.nargs + if len(state.rargs) < nargs: + _error_opt_args(nargs, opt) + elif nargs == 1: + value = state.rargs.pop(0) + else: + value = tuple(state.rargs[:nargs]) + del state.rargs[:nargs] + + elif explicit_value is not None: + raise BadOptionUsage(opt, '%s option does not take a value' % opt) + + else: + value = None + + option.process(value, state) + + def _match_short_opt(self, arg, state): + stop = False + i = 1 + prefix = arg[0] + unknown_options = [] + + for ch in arg[1:]: + opt = normalize_opt(prefix + ch, self.ctx) + option = self._short_opt.get(opt) + i += 1 + + if not option: + if self.ignore_unknown_options: + unknown_options.append(ch) + continue + raise NoSuchOption(opt, ctx=self.ctx) + if option.takes_value: + # Any characters left in arg? Pretend they're the + # next arg, and stop consuming characters of arg. + if i < len(arg): + state.rargs.insert(0, arg[i:]) + stop = True + + nargs = option.nargs + if len(state.rargs) < nargs: + _error_opt_args(nargs, opt) + elif nargs == 1: + value = state.rargs.pop(0) + else: + value = tuple(state.rargs[:nargs]) + del state.rargs[:nargs] + + else: + value = None + + option.process(value, state) + + if stop: + break + + # If we got any unknown options we re-combinate the string of the + # remaining options and re-attach the prefix, then report that + # to the state as new larg. This way there is basic combinatorics + # that can be achieved while still ignoring unknown arguments. + if self.ignore_unknown_options and unknown_options: + state.largs.append(prefix + ''.join(unknown_options)) + + def _process_opts(self, arg, state): + explicit_value = None + # Long option handling happens in two parts. The first part is + # supporting explicitly attached values. In any case, we will try + # to long match the option first. + if '=' in arg: + long_opt, explicit_value = arg.split('=', 1) + else: + long_opt = arg + norm_long_opt = normalize_opt(long_opt, self.ctx) + + # At this point we will match the (assumed) long option through + # the long option matching code. Note that this allows options + # like "-foo" to be matched as long options. + try: + self._match_long_opt(norm_long_opt, explicit_value, state) + except NoSuchOption: + # At this point the long option matching failed, and we need + # to try with short options. However there is a special rule + # which says, that if we have a two character options prefix + # (applies to "--foo" for instance), we do not dispatch to the + # short option code and will instead raise the no option + # error. + if arg[:2] not in self._opt_prefixes: + return self._match_short_opt(arg, state) + if not self.ignore_unknown_options: + raise + state.largs.append(arg) diff --git a/venv/lib/python3.7/site-packages/click/termui.py b/venv/lib/python3.7/site-packages/click/termui.py new file mode 100644 index 0000000..bf9a3aa --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/termui.py @@ -0,0 +1,606 @@ +import os +import sys +import struct +import inspect +import itertools + +from ._compat import raw_input, text_type, string_types, \ + isatty, strip_ansi, get_winterm_size, DEFAULT_COLUMNS, WIN +from .utils import echo +from .exceptions import Abort, UsageError +from .types import convert_type, Choice, Path +from .globals import resolve_color_default + + +# The prompt functions to use. The doc tools currently override these +# functions to customize how they work. +visible_prompt_func = raw_input + +_ansi_colors = { + 'black': 30, + 'red': 31, + 'green': 32, + 'yellow': 33, + 'blue': 34, + 'magenta': 35, + 'cyan': 36, + 'white': 37, + 'reset': 39, + 'bright_black': 90, + 'bright_red': 91, + 'bright_green': 92, + 'bright_yellow': 93, + 'bright_blue': 94, + 'bright_magenta': 95, + 'bright_cyan': 96, + 'bright_white': 97, +} +_ansi_reset_all = '\033[0m' + + +def hidden_prompt_func(prompt): + import getpass + return getpass.getpass(prompt) + + +def _build_prompt(text, suffix, show_default=False, default=None, show_choices=True, type=None): + prompt = text + if type is not None and show_choices and isinstance(type, Choice): + prompt += ' (' + ", ".join(map(str, type.choices)) + ')' + if default is not None and show_default: + prompt = '%s [%s]' % (prompt, default) + return prompt + suffix + + +def prompt(text, default=None, hide_input=False, confirmation_prompt=False, + type=None, value_proc=None, prompt_suffix=': ', show_default=True, + err=False, show_choices=True): + """Prompts a user for input. This is a convenience function that can + be used to prompt a user for input later. + + If the user aborts the input by sending a interrupt signal, this + function will catch it and raise a :exc:`Abort` exception. + + .. versionadded:: 7.0 + Added the show_choices parameter. + + .. versionadded:: 6.0 + Added unicode support for cmd.exe on Windows. + + .. versionadded:: 4.0 + Added the `err` parameter. + + :param text: the text to show for the prompt. + :param default: the default value to use if no input happens. If this + is not given it will prompt until it's aborted. + :param hide_input: if this is set to true then the input value will + be hidden. + :param confirmation_prompt: asks for confirmation for the value. + :param type: the type to use to check the value against. + :param value_proc: if this parameter is provided it's a function that + is invoked instead of the type conversion to + convert a value. + :param prompt_suffix: a suffix that should be added to the prompt. + :param show_default: shows or hides the default value in the prompt. + :param err: if set to true the file defaults to ``stderr`` instead of + ``stdout``, the same as with echo. + :param show_choices: Show or hide choices if the passed type is a Choice. + For example if type is a Choice of either day or week, + show_choices is true and text is "Group by" then the + prompt will be "Group by (day, week): ". + """ + result = None + + def prompt_func(text): + f = hide_input and hidden_prompt_func or visible_prompt_func + try: + # Write the prompt separately so that we get nice + # coloring through colorama on Windows + echo(text, nl=False, err=err) + return f('') + except (KeyboardInterrupt, EOFError): + # getpass doesn't print a newline if the user aborts input with ^C. + # Allegedly this behavior is inherited from getpass(3). + # A doc bug has been filed at https://bugs.python.org/issue24711 + if hide_input: + echo(None, err=err) + raise Abort() + + if value_proc is None: + value_proc = convert_type(type, default) + + prompt = _build_prompt(text, prompt_suffix, show_default, default, show_choices, type) + + while 1: + while 1: + value = prompt_func(prompt) + if value: + break + elif default is not None: + if isinstance(value_proc, Path): + # validate Path default value(exists, dir_okay etc.) + value = default + break + return default + try: + result = value_proc(value) + except UsageError as e: + echo('Error: %s' % e.message, err=err) + continue + if not confirmation_prompt: + return result + while 1: + value2 = prompt_func('Repeat for confirmation: ') + if value2: + break + if value == value2: + return result + echo('Error: the two entered values do not match', err=err) + + +def confirm(text, default=False, abort=False, prompt_suffix=': ', + show_default=True, err=False): + """Prompts for confirmation (yes/no question). + + If the user aborts the input by sending a interrupt signal this + function will catch it and raise a :exc:`Abort` exception. + + .. versionadded:: 4.0 + Added the `err` parameter. + + :param text: the question to ask. + :param default: the default for the prompt. + :param abort: if this is set to `True` a negative answer aborts the + exception by raising :exc:`Abort`. + :param prompt_suffix: a suffix that should be added to the prompt. + :param show_default: shows or hides the default value in the prompt. + :param err: if set to true the file defaults to ``stderr`` instead of + ``stdout``, the same as with echo. + """ + prompt = _build_prompt(text, prompt_suffix, show_default, + default and 'Y/n' or 'y/N') + while 1: + try: + # Write the prompt separately so that we get nice + # coloring through colorama on Windows + echo(prompt, nl=False, err=err) + value = visible_prompt_func('').lower().strip() + except (KeyboardInterrupt, EOFError): + raise Abort() + if value in ('y', 'yes'): + rv = True + elif value in ('n', 'no'): + rv = False + elif value == '': + rv = default + else: + echo('Error: invalid input', err=err) + continue + break + if abort and not rv: + raise Abort() + return rv + + +def get_terminal_size(): + """Returns the current size of the terminal as tuple in the form + ``(width, height)`` in columns and rows. + """ + # If shutil has get_terminal_size() (Python 3.3 and later) use that + if sys.version_info >= (3, 3): + import shutil + shutil_get_terminal_size = getattr(shutil, 'get_terminal_size', None) + if shutil_get_terminal_size: + sz = shutil_get_terminal_size() + return sz.columns, sz.lines + + # We provide a sensible default for get_winterm_size() when being invoked + # inside a subprocess. Without this, it would not provide a useful input. + if get_winterm_size is not None: + size = get_winterm_size() + if size == (0, 0): + return (79, 24) + else: + return size + + def ioctl_gwinsz(fd): + try: + import fcntl + import termios + cr = struct.unpack( + 'hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234')) + except Exception: + return + return cr + + cr = ioctl_gwinsz(0) or ioctl_gwinsz(1) or ioctl_gwinsz(2) + if not cr: + try: + fd = os.open(os.ctermid(), os.O_RDONLY) + try: + cr = ioctl_gwinsz(fd) + finally: + os.close(fd) + except Exception: + pass + if not cr or not cr[0] or not cr[1]: + cr = (os.environ.get('LINES', 25), + os.environ.get('COLUMNS', DEFAULT_COLUMNS)) + return int(cr[1]), int(cr[0]) + + +def echo_via_pager(text_or_generator, color=None): + """This function takes a text and shows it via an environment specific + pager on stdout. + + .. versionchanged:: 3.0 + Added the `color` flag. + + :param text_or_generator: the text to page, or alternatively, a + generator emitting the text to page. + :param color: controls if the pager supports ANSI colors or not. The + default is autodetection. + """ + color = resolve_color_default(color) + + if inspect.isgeneratorfunction(text_or_generator): + i = text_or_generator() + elif isinstance(text_or_generator, string_types): + i = [text_or_generator] + else: + i = iter(text_or_generator) + + # convert every element of i to a text type if necessary + text_generator = (el if isinstance(el, string_types) else text_type(el) + for el in i) + + from ._termui_impl import pager + return pager(itertools.chain(text_generator, "\n"), color) + + +def progressbar(iterable=None, length=None, label=None, show_eta=True, + show_percent=None, show_pos=False, + item_show_func=None, fill_char='#', empty_char='-', + bar_template='%(label)s [%(bar)s] %(info)s', + info_sep=' ', width=36, file=None, color=None): + """This function creates an iterable context manager that can be used + to iterate over something while showing a progress bar. It will + either iterate over the `iterable` or `length` items (that are counted + up). While iteration happens, this function will print a rendered + progress bar to the given `file` (defaults to stdout) and will attempt + to calculate remaining time and more. By default, this progress bar + will not be rendered if the file is not a terminal. + + The context manager creates the progress bar. When the context + manager is entered the progress bar is already displayed. With every + iteration over the progress bar, the iterable passed to the bar is + advanced and the bar is updated. When the context manager exits, + a newline is printed and the progress bar is finalized on screen. + + No printing must happen or the progress bar will be unintentionally + destroyed. + + Example usage:: + + with progressbar(items) as bar: + for item in bar: + do_something_with(item) + + Alternatively, if no iterable is specified, one can manually update the + progress bar through the `update()` method instead of directly + iterating over the progress bar. The update method accepts the number + of steps to increment the bar with:: + + with progressbar(length=chunks.total_bytes) as bar: + for chunk in chunks: + process_chunk(chunk) + bar.update(chunks.bytes) + + .. versionadded:: 2.0 + + .. versionadded:: 4.0 + Added the `color` parameter. Added a `update` method to the + progressbar object. + + :param iterable: an iterable to iterate over. If not provided the length + is required. + :param length: the number of items to iterate over. By default the + progressbar will attempt to ask the iterator about its + length, which might or might not work. If an iterable is + also provided this parameter can be used to override the + length. If an iterable is not provided the progress bar + will iterate over a range of that length. + :param label: the label to show next to the progress bar. + :param show_eta: enables or disables the estimated time display. This is + automatically disabled if the length cannot be + determined. + :param show_percent: enables or disables the percentage display. The + default is `True` if the iterable has a length or + `False` if not. + :param show_pos: enables or disables the absolute position display. The + default is `False`. + :param item_show_func: a function called with the current item which + can return a string to show the current item + next to the progress bar. Note that the current + item can be `None`! + :param fill_char: the character to use to show the filled part of the + progress bar. + :param empty_char: the character to use to show the non-filled part of + the progress bar. + :param bar_template: the format string to use as template for the bar. + The parameters in it are ``label`` for the label, + ``bar`` for the progress bar and ``info`` for the + info section. + :param info_sep: the separator between multiple info items (eta etc.) + :param width: the width of the progress bar in characters, 0 means full + terminal width + :param file: the file to write to. If this is not a terminal then + only the label is printed. + :param color: controls if the terminal supports ANSI colors or not. The + default is autodetection. This is only needed if ANSI + codes are included anywhere in the progress bar output + which is not the case by default. + """ + from ._termui_impl import ProgressBar + color = resolve_color_default(color) + return ProgressBar(iterable=iterable, length=length, show_eta=show_eta, + show_percent=show_percent, show_pos=show_pos, + item_show_func=item_show_func, fill_char=fill_char, + empty_char=empty_char, bar_template=bar_template, + info_sep=info_sep, file=file, label=label, + width=width, color=color) + + +def clear(): + """Clears the terminal screen. This will have the effect of clearing + the whole visible space of the terminal and moving the cursor to the + top left. This does not do anything if not connected to a terminal. + + .. versionadded:: 2.0 + """ + if not isatty(sys.stdout): + return + # If we're on Windows and we don't have colorama available, then we + # clear the screen by shelling out. Otherwise we can use an escape + # sequence. + if WIN: + os.system('cls') + else: + sys.stdout.write('\033[2J\033[1;1H') + + +def style(text, fg=None, bg=None, bold=None, dim=None, underline=None, + blink=None, reverse=None, reset=True): + """Styles a text with ANSI styles and returns the new string. By + default the styling is self contained which means that at the end + of the string a reset code is issued. This can be prevented by + passing ``reset=False``. + + Examples:: + + click.echo(click.style('Hello World!', fg='green')) + click.echo(click.style('ATTENTION!', blink=True)) + click.echo(click.style('Some things', reverse=True, fg='cyan')) + + Supported color names: + + * ``black`` (might be a gray) + * ``red`` + * ``green`` + * ``yellow`` (might be an orange) + * ``blue`` + * ``magenta`` + * ``cyan`` + * ``white`` (might be light gray) + * ``bright_black`` + * ``bright_red`` + * ``bright_green`` + * ``bright_yellow`` + * ``bright_blue`` + * ``bright_magenta`` + * ``bright_cyan`` + * ``bright_white`` + * ``reset`` (reset the color code only) + + .. versionadded:: 2.0 + + .. versionadded:: 7.0 + Added support for bright colors. + + :param text: the string to style with ansi codes. + :param fg: if provided this will become the foreground color. + :param bg: if provided this will become the background color. + :param bold: if provided this will enable or disable bold mode. + :param dim: if provided this will enable or disable dim mode. This is + badly supported. + :param underline: if provided this will enable or disable underline. + :param blink: if provided this will enable or disable blinking. + :param reverse: if provided this will enable or disable inverse + rendering (foreground becomes background and the + other way round). + :param reset: by default a reset-all code is added at the end of the + string which means that styles do not carry over. This + can be disabled to compose styles. + """ + bits = [] + if fg: + try: + bits.append('\033[%dm' % (_ansi_colors[fg])) + except KeyError: + raise TypeError('Unknown color %r' % fg) + if bg: + try: + bits.append('\033[%dm' % (_ansi_colors[bg] + 10)) + except KeyError: + raise TypeError('Unknown color %r' % bg) + if bold is not None: + bits.append('\033[%dm' % (1 if bold else 22)) + if dim is not None: + bits.append('\033[%dm' % (2 if dim else 22)) + if underline is not None: + bits.append('\033[%dm' % (4 if underline else 24)) + if blink is not None: + bits.append('\033[%dm' % (5 if blink else 25)) + if reverse is not None: + bits.append('\033[%dm' % (7 if reverse else 27)) + bits.append(text) + if reset: + bits.append(_ansi_reset_all) + return ''.join(bits) + + +def unstyle(text): + """Removes ANSI styling information from a string. Usually it's not + necessary to use this function as Click's echo function will + automatically remove styling if necessary. + + .. versionadded:: 2.0 + + :param text: the text to remove style information from. + """ + return strip_ansi(text) + + +def secho(message=None, file=None, nl=True, err=False, color=None, **styles): + """This function combines :func:`echo` and :func:`style` into one + call. As such the following two calls are the same:: + + click.secho('Hello World!', fg='green') + click.echo(click.style('Hello World!', fg='green')) + + All keyword arguments are forwarded to the underlying functions + depending on which one they go with. + + .. versionadded:: 2.0 + """ + if message is not None: + message = style(message, **styles) + return echo(message, file=file, nl=nl, err=err, color=color) + + +def edit(text=None, editor=None, env=None, require_save=True, + extension='.txt', filename=None): + r"""Edits the given text in the defined editor. If an editor is given + (should be the full path to the executable but the regular operating + system search path is used for finding the executable) it overrides + the detected editor. Optionally, some environment variables can be + used. If the editor is closed without changes, `None` is returned. In + case a file is edited directly the return value is always `None` and + `require_save` and `extension` are ignored. + + If the editor cannot be opened a :exc:`UsageError` is raised. + + Note for Windows: to simplify cross-platform usage, the newlines are + automatically converted from POSIX to Windows and vice versa. As such, + the message here will have ``\n`` as newline markers. + + :param text: the text to edit. + :param editor: optionally the editor to use. Defaults to automatic + detection. + :param env: environment variables to forward to the editor. + :param require_save: if this is true, then not saving in the editor + will make the return value become `None`. + :param extension: the extension to tell the editor about. This defaults + to `.txt` but changing this might change syntax + highlighting. + :param filename: if provided it will edit this file instead of the + provided text contents. It will not use a temporary + file as an indirection in that case. + """ + from ._termui_impl import Editor + editor = Editor(editor=editor, env=env, require_save=require_save, + extension=extension) + if filename is None: + return editor.edit(text) + editor.edit_file(filename) + + +def launch(url, wait=False, locate=False): + """This function launches the given URL (or filename) in the default + viewer application for this file type. If this is an executable, it + might launch the executable in a new session. The return value is + the exit code of the launched application. Usually, ``0`` indicates + success. + + Examples:: + + click.launch('https://click.palletsprojects.com/') + click.launch('/my/downloaded/file', locate=True) + + .. versionadded:: 2.0 + + :param url: URL or filename of the thing to launch. + :param wait: waits for the program to stop. + :param locate: if this is set to `True` then instead of launching the + application associated with the URL it will attempt to + launch a file manager with the file located. This + might have weird effects if the URL does not point to + the filesystem. + """ + from ._termui_impl import open_url + return open_url(url, wait=wait, locate=locate) + + +# If this is provided, getchar() calls into this instead. This is used +# for unittesting purposes. +_getchar = None + + +def getchar(echo=False): + """Fetches a single character from the terminal and returns it. This + will always return a unicode character and under certain rare + circumstances this might return more than one character. The + situations which more than one character is returned is when for + whatever reason multiple characters end up in the terminal buffer or + standard input was not actually a terminal. + + Note that this will always read from the terminal, even if something + is piped into the standard input. + + Note for Windows: in rare cases when typing non-ASCII characters, this + function might wait for a second character and then return both at once. + This is because certain Unicode characters look like special-key markers. + + .. versionadded:: 2.0 + + :param echo: if set to `True`, the character read will also show up on + the terminal. The default is to not show it. + """ + f = _getchar + if f is None: + from ._termui_impl import getchar as f + return f(echo) + + +def raw_terminal(): + from ._termui_impl import raw_terminal as f + return f() + + +def pause(info='Press any key to continue ...', err=False): + """This command stops execution and waits for the user to press any + key to continue. This is similar to the Windows batch "pause" + command. If the program is not run through a terminal, this command + will instead do nothing. + + .. versionadded:: 2.0 + + .. versionadded:: 4.0 + Added the `err` parameter. + + :param info: the info string to print before pausing. + :param err: if set to message goes to ``stderr`` instead of + ``stdout``, the same as with echo. + """ + if not isatty(sys.stdin) or not isatty(sys.stdout): + return + try: + if info: + echo(info, nl=False, err=err) + try: + getchar() + except (KeyboardInterrupt, EOFError): + pass + finally: + if info: + echo(err=err) diff --git a/venv/lib/python3.7/site-packages/click/testing.py b/venv/lib/python3.7/site-packages/click/testing.py new file mode 100644 index 0000000..1b2924e --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/testing.py @@ -0,0 +1,374 @@ +import os +import sys +import shutil +import tempfile +import contextlib +import shlex + +from ._compat import iteritems, PY2, string_types + + +# If someone wants to vendor click, we want to ensure the +# correct package is discovered. Ideally we could use a +# relative import here but unfortunately Python does not +# support that. +clickpkg = sys.modules[__name__.rsplit('.', 1)[0]] + + +if PY2: + from cStringIO import StringIO +else: + import io + from ._compat import _find_binary_reader + + +class EchoingStdin(object): + + def __init__(self, input, output): + self._input = input + self._output = output + + def __getattr__(self, x): + return getattr(self._input, x) + + def _echo(self, rv): + self._output.write(rv) + return rv + + def read(self, n=-1): + return self._echo(self._input.read(n)) + + def readline(self, n=-1): + return self._echo(self._input.readline(n)) + + def readlines(self): + return [self._echo(x) for x in self._input.readlines()] + + def __iter__(self): + return iter(self._echo(x) for x in self._input) + + def __repr__(self): + return repr(self._input) + + +def make_input_stream(input, charset): + # Is already an input stream. + if hasattr(input, 'read'): + if PY2: + return input + rv = _find_binary_reader(input) + if rv is not None: + return rv + raise TypeError('Could not find binary reader for input stream.') + + if input is None: + input = b'' + elif not isinstance(input, bytes): + input = input.encode(charset) + if PY2: + return StringIO(input) + return io.BytesIO(input) + + +class Result(object): + """Holds the captured result of an invoked CLI script.""" + + def __init__(self, runner, stdout_bytes, stderr_bytes, exit_code, + exception, exc_info=None): + #: The runner that created the result + self.runner = runner + #: The standard output as bytes. + self.stdout_bytes = stdout_bytes + #: The standard error as bytes, or False(y) if not available + self.stderr_bytes = stderr_bytes + #: The exit code as integer. + self.exit_code = exit_code + #: The exception that happened if one did. + self.exception = exception + #: The traceback + self.exc_info = exc_info + + @property + def output(self): + """The (standard) output as unicode string.""" + return self.stdout + + @property + def stdout(self): + """The standard output as unicode string.""" + return self.stdout_bytes.decode(self.runner.charset, 'replace') \ + .replace('\r\n', '\n') + + @property + def stderr(self): + """The standard error as unicode string.""" + if not self.stderr_bytes: + raise ValueError("stderr not separately captured") + return self.stderr_bytes.decode(self.runner.charset, 'replace') \ + .replace('\r\n', '\n') + + + def __repr__(self): + return '<%s %s>' % ( + type(self).__name__, + self.exception and repr(self.exception) or 'okay', + ) + + +class CliRunner(object): + """The CLI runner provides functionality to invoke a Click command line + script for unittesting purposes in a isolated environment. This only + works in single-threaded systems without any concurrency as it changes the + global interpreter state. + + :param charset: the character set for the input and output data. This is + UTF-8 by default and should not be changed currently as + the reporting to Click only works in Python 2 properly. + :param env: a dictionary with environment variables for overriding. + :param echo_stdin: if this is set to `True`, then reading from stdin writes + to stdout. This is useful for showing examples in + some circumstances. Note that regular prompts + will automatically echo the input. + :param mix_stderr: if this is set to `False`, then stdout and stderr are + preserved as independent streams. This is useful for + Unix-philosophy apps that have predictable stdout and + noisy stderr, such that each may be measured + independently + """ + + def __init__(self, charset=None, env=None, echo_stdin=False, + mix_stderr=True): + if charset is None: + charset = 'utf-8' + self.charset = charset + self.env = env or {} + self.echo_stdin = echo_stdin + self.mix_stderr = mix_stderr + + def get_default_prog_name(self, cli): + """Given a command object it will return the default program name + for it. The default is the `name` attribute or ``"root"`` if not + set. + """ + return cli.name or 'root' + + def make_env(self, overrides=None): + """Returns the environment overrides for invoking a script.""" + rv = dict(self.env) + if overrides: + rv.update(overrides) + return rv + + @contextlib.contextmanager + def isolation(self, input=None, env=None, color=False): + """A context manager that sets up the isolation for invoking of a + command line tool. This sets up stdin with the given input data + and `os.environ` with the overrides from the given dictionary. + This also rebinds some internals in Click to be mocked (like the + prompt functionality). + + This is automatically done in the :meth:`invoke` method. + + .. versionadded:: 4.0 + The ``color`` parameter was added. + + :param input: the input stream to put into sys.stdin. + :param env: the environment overrides as dictionary. + :param color: whether the output should contain color codes. The + application can still override this explicitly. + """ + input = make_input_stream(input, self.charset) + + old_stdin = sys.stdin + old_stdout = sys.stdout + old_stderr = sys.stderr + old_forced_width = clickpkg.formatting.FORCED_WIDTH + clickpkg.formatting.FORCED_WIDTH = 80 + + env = self.make_env(env) + + if PY2: + bytes_output = StringIO() + if self.echo_stdin: + input = EchoingStdin(input, bytes_output) + sys.stdout = bytes_output + if not self.mix_stderr: + bytes_error = StringIO() + sys.stderr = bytes_error + else: + bytes_output = io.BytesIO() + if self.echo_stdin: + input = EchoingStdin(input, bytes_output) + input = io.TextIOWrapper(input, encoding=self.charset) + sys.stdout = io.TextIOWrapper( + bytes_output, encoding=self.charset) + if not self.mix_stderr: + bytes_error = io.BytesIO() + sys.stderr = io.TextIOWrapper( + bytes_error, encoding=self.charset) + + if self.mix_stderr: + sys.stderr = sys.stdout + + sys.stdin = input + + def visible_input(prompt=None): + sys.stdout.write(prompt or '') + val = input.readline().rstrip('\r\n') + sys.stdout.write(val + '\n') + sys.stdout.flush() + return val + + def hidden_input(prompt=None): + sys.stdout.write((prompt or '') + '\n') + sys.stdout.flush() + return input.readline().rstrip('\r\n') + + def _getchar(echo): + char = sys.stdin.read(1) + if echo: + sys.stdout.write(char) + sys.stdout.flush() + return char + + default_color = color + + def should_strip_ansi(stream=None, color=None): + if color is None: + return not default_color + return not color + + old_visible_prompt_func = clickpkg.termui.visible_prompt_func + old_hidden_prompt_func = clickpkg.termui.hidden_prompt_func + old__getchar_func = clickpkg.termui._getchar + old_should_strip_ansi = clickpkg.utils.should_strip_ansi + clickpkg.termui.visible_prompt_func = visible_input + clickpkg.termui.hidden_prompt_func = hidden_input + clickpkg.termui._getchar = _getchar + clickpkg.utils.should_strip_ansi = should_strip_ansi + + old_env = {} + try: + for key, value in iteritems(env): + old_env[key] = os.environ.get(key) + if value is None: + try: + del os.environ[key] + except Exception: + pass + else: + os.environ[key] = value + yield (bytes_output, not self.mix_stderr and bytes_error) + finally: + for key, value in iteritems(old_env): + if value is None: + try: + del os.environ[key] + except Exception: + pass + else: + os.environ[key] = value + sys.stdout = old_stdout + sys.stderr = old_stderr + sys.stdin = old_stdin + clickpkg.termui.visible_prompt_func = old_visible_prompt_func + clickpkg.termui.hidden_prompt_func = old_hidden_prompt_func + clickpkg.termui._getchar = old__getchar_func + clickpkg.utils.should_strip_ansi = old_should_strip_ansi + clickpkg.formatting.FORCED_WIDTH = old_forced_width + + def invoke(self, cli, args=None, input=None, env=None, + catch_exceptions=True, color=False, mix_stderr=False, **extra): + """Invokes a command in an isolated environment. The arguments are + forwarded directly to the command line script, the `extra` keyword + arguments are passed to the :meth:`~clickpkg.Command.main` function of + the command. + + This returns a :class:`Result` object. + + .. versionadded:: 3.0 + The ``catch_exceptions`` parameter was added. + + .. versionchanged:: 3.0 + The result object now has an `exc_info` attribute with the + traceback if available. + + .. versionadded:: 4.0 + The ``color`` parameter was added. + + :param cli: the command to invoke + :param args: the arguments to invoke. It may be given as an iterable + or a string. When given as string it will be interpreted + as a Unix shell command. More details at + :func:`shlex.split`. + :param input: the input data for `sys.stdin`. + :param env: the environment overrides. + :param catch_exceptions: Whether to catch any other exceptions than + ``SystemExit``. + :param extra: the keyword arguments to pass to :meth:`main`. + :param color: whether the output should contain color codes. The + application can still override this explicitly. + """ + exc_info = None + with self.isolation(input=input, env=env, color=color) as outstreams: + exception = None + exit_code = 0 + + if isinstance(args, string_types): + args = shlex.split(args) + + try: + prog_name = extra.pop("prog_name") + except KeyError: + prog_name = self.get_default_prog_name(cli) + + try: + cli.main(args=args or (), prog_name=prog_name, **extra) + except SystemExit as e: + exc_info = sys.exc_info() + exit_code = e.code + if exit_code is None: + exit_code = 0 + + if exit_code != 0: + exception = e + + if not isinstance(exit_code, int): + sys.stdout.write(str(exit_code)) + sys.stdout.write('\n') + exit_code = 1 + + except Exception as e: + if not catch_exceptions: + raise + exception = e + exit_code = 1 + exc_info = sys.exc_info() + finally: + sys.stdout.flush() + stdout = outstreams[0].getvalue() + stderr = outstreams[1] and outstreams[1].getvalue() + + return Result(runner=self, + stdout_bytes=stdout, + stderr_bytes=stderr, + exit_code=exit_code, + exception=exception, + exc_info=exc_info) + + @contextlib.contextmanager + def isolated_filesystem(self): + """A context manager that creates a temporary folder and changes + the current working directory to it for isolated filesystem tests. + """ + cwd = os.getcwd() + t = tempfile.mkdtemp() + os.chdir(t) + try: + yield t + finally: + os.chdir(cwd) + try: + shutil.rmtree(t) + except (OSError, IOError): + pass diff --git a/venv/lib/python3.7/site-packages/click/types.py b/venv/lib/python3.7/site-packages/click/types.py new file mode 100644 index 0000000..1f88032 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/types.py @@ -0,0 +1,668 @@ +import os +import stat +from datetime import datetime + +from ._compat import open_stream, text_type, filename_to_ui, \ + get_filesystem_encoding, get_streerror, _get_argv_encoding, PY2 +from .exceptions import BadParameter +from .utils import safecall, LazyFile + + +class ParamType(object): + """Helper for converting values through types. The following is + necessary for a valid type: + + * it needs a name + * it needs to pass through None unchanged + * it needs to convert from a string + * it needs to convert its result type through unchanged + (eg: needs to be idempotent) + * it needs to be able to deal with param and context being `None`. + This can be the case when the object is used with prompt + inputs. + """ + is_composite = False + + #: the descriptive name of this type + name = None + + #: if a list of this type is expected and the value is pulled from a + #: string environment variable, this is what splits it up. `None` + #: means any whitespace. For all parameters the general rule is that + #: whitespace splits them up. The exception are paths and files which + #: are split by ``os.path.pathsep`` by default (":" on Unix and ";" on + #: Windows). + envvar_list_splitter = None + + def __call__(self, value, param=None, ctx=None): + if value is not None: + return self.convert(value, param, ctx) + + def get_metavar(self, param): + """Returns the metavar default for this param if it provides one.""" + + def get_missing_message(self, param): + """Optionally might return extra information about a missing + parameter. + + .. versionadded:: 2.0 + """ + + def convert(self, value, param, ctx): + """Converts the value. This is not invoked for values that are + `None` (the missing value). + """ + return value + + def split_envvar_value(self, rv): + """Given a value from an environment variable this splits it up + into small chunks depending on the defined envvar list splitter. + + If the splitter is set to `None`, which means that whitespace splits, + then leading and trailing whitespace is ignored. Otherwise, leading + and trailing splitters usually lead to empty items being included. + """ + return (rv or '').split(self.envvar_list_splitter) + + def fail(self, message, param=None, ctx=None): + """Helper method to fail with an invalid value message.""" + raise BadParameter(message, ctx=ctx, param=param) + + +class CompositeParamType(ParamType): + is_composite = True + + @property + def arity(self): + raise NotImplementedError() + + +class FuncParamType(ParamType): + + def __init__(self, func): + self.name = func.__name__ + self.func = func + + def convert(self, value, param, ctx): + try: + return self.func(value) + except ValueError: + try: + value = text_type(value) + except UnicodeError: + value = str(value).decode('utf-8', 'replace') + self.fail(value, param, ctx) + + +class UnprocessedParamType(ParamType): + name = 'text' + + def convert(self, value, param, ctx): + return value + + def __repr__(self): + return 'UNPROCESSED' + + +class StringParamType(ParamType): + name = 'text' + + def convert(self, value, param, ctx): + if isinstance(value, bytes): + enc = _get_argv_encoding() + try: + value = value.decode(enc) + except UnicodeError: + fs_enc = get_filesystem_encoding() + if fs_enc != enc: + try: + value = value.decode(fs_enc) + except UnicodeError: + value = value.decode('utf-8', 'replace') + return value + return value + + def __repr__(self): + return 'STRING' + + +class Choice(ParamType): + """The choice type allows a value to be checked against a fixed set + of supported values. All of these values have to be strings. + + You should only pass a list or tuple of choices. Other iterables + (like generators) may lead to surprising results. + + See :ref:`choice-opts` for an example. + + :param case_sensitive: Set to false to make choices case + insensitive. Defaults to true. + """ + + name = 'choice' + + def __init__(self, choices, case_sensitive=True): + self.choices = choices + self.case_sensitive = case_sensitive + + def get_metavar(self, param): + return '[%s]' % '|'.join(self.choices) + + def get_missing_message(self, param): + return 'Choose from:\n\t%s.' % ',\n\t'.join(self.choices) + + def convert(self, value, param, ctx): + # Exact match + if value in self.choices: + return value + + # Match through normalization and case sensitivity + # first do token_normalize_func, then lowercase + # preserve original `value` to produce an accurate message in + # `self.fail` + normed_value = value + normed_choices = self.choices + + if ctx is not None and \ + ctx.token_normalize_func is not None: + normed_value = ctx.token_normalize_func(value) + normed_choices = [ctx.token_normalize_func(choice) for choice in + self.choices] + + if not self.case_sensitive: + normed_value = normed_value.lower() + normed_choices = [choice.lower() for choice in normed_choices] + + if normed_value in normed_choices: + return normed_value + + self.fail('invalid choice: %s. (choose from %s)' % + (value, ', '.join(self.choices)), param, ctx) + + def __repr__(self): + return 'Choice(%r)' % list(self.choices) + + +class DateTime(ParamType): + """The DateTime type converts date strings into `datetime` objects. + + The format strings which are checked are configurable, but default to some + common (non-timezone aware) ISO 8601 formats. + + When specifying *DateTime* formats, you should only pass a list or a tuple. + Other iterables, like generators, may lead to surprising results. + + The format strings are processed using ``datetime.strptime``, and this + consequently defines the format strings which are allowed. + + Parsing is tried using each format, in order, and the first format which + parses successfully is used. + + :param formats: A list or tuple of date format strings, in the order in + which they should be tried. Defaults to + ``'%Y-%m-%d'``, ``'%Y-%m-%dT%H:%M:%S'``, + ``'%Y-%m-%d %H:%M:%S'``. + """ + name = 'datetime' + + def __init__(self, formats=None): + self.formats = formats or [ + '%Y-%m-%d', + '%Y-%m-%dT%H:%M:%S', + '%Y-%m-%d %H:%M:%S' + ] + + def get_metavar(self, param): + return '[{}]'.format('|'.join(self.formats)) + + def _try_to_convert_date(self, value, format): + try: + return datetime.strptime(value, format) + except ValueError: + return None + + def convert(self, value, param, ctx): + # Exact match + for format in self.formats: + dtime = self._try_to_convert_date(value, format) + if dtime: + return dtime + + self.fail( + 'invalid datetime format: {}. (choose from {})'.format( + value, ', '.join(self.formats))) + + def __repr__(self): + return 'DateTime' + + +class IntParamType(ParamType): + name = 'integer' + + def convert(self, value, param, ctx): + try: + return int(value) + except (ValueError, UnicodeError): + self.fail('%s is not a valid integer' % value, param, ctx) + + def __repr__(self): + return 'INT' + + +class IntRange(IntParamType): + """A parameter that works similar to :data:`click.INT` but restricts + the value to fit into a range. The default behavior is to fail if the + value falls outside the range, but it can also be silently clamped + between the two edges. + + See :ref:`ranges` for an example. + """ + name = 'integer range' + + def __init__(self, min=None, max=None, clamp=False): + self.min = min + self.max = max + self.clamp = clamp + + def convert(self, value, param, ctx): + rv = IntParamType.convert(self, value, param, ctx) + if self.clamp: + if self.min is not None and rv < self.min: + return self.min + if self.max is not None and rv > self.max: + return self.max + if self.min is not None and rv < self.min or \ + self.max is not None and rv > self.max: + if self.min is None: + self.fail('%s is bigger than the maximum valid value ' + '%s.' % (rv, self.max), param, ctx) + elif self.max is None: + self.fail('%s is smaller than the minimum valid value ' + '%s.' % (rv, self.min), param, ctx) + else: + self.fail('%s is not in the valid range of %s to %s.' + % (rv, self.min, self.max), param, ctx) + return rv + + def __repr__(self): + return 'IntRange(%r, %r)' % (self.min, self.max) + + +class FloatParamType(ParamType): + name = 'float' + + def convert(self, value, param, ctx): + try: + return float(value) + except (UnicodeError, ValueError): + self.fail('%s is not a valid floating point value' % + value, param, ctx) + + def __repr__(self): + return 'FLOAT' + + +class FloatRange(FloatParamType): + """A parameter that works similar to :data:`click.FLOAT` but restricts + the value to fit into a range. The default behavior is to fail if the + value falls outside the range, but it can also be silently clamped + between the two edges. + + See :ref:`ranges` for an example. + """ + name = 'float range' + + def __init__(self, min=None, max=None, clamp=False): + self.min = min + self.max = max + self.clamp = clamp + + def convert(self, value, param, ctx): + rv = FloatParamType.convert(self, value, param, ctx) + if self.clamp: + if self.min is not None and rv < self.min: + return self.min + if self.max is not None and rv > self.max: + return self.max + if self.min is not None and rv < self.min or \ + self.max is not None and rv > self.max: + if self.min is None: + self.fail('%s is bigger than the maximum valid value ' + '%s.' % (rv, self.max), param, ctx) + elif self.max is None: + self.fail('%s is smaller than the minimum valid value ' + '%s.' % (rv, self.min), param, ctx) + else: + self.fail('%s is not in the valid range of %s to %s.' + % (rv, self.min, self.max), param, ctx) + return rv + + def __repr__(self): + return 'FloatRange(%r, %r)' % (self.min, self.max) + + +class BoolParamType(ParamType): + name = 'boolean' + + def convert(self, value, param, ctx): + if isinstance(value, bool): + return bool(value) + value = value.lower() + if value in ('true', 't', '1', 'yes', 'y'): + return True + elif value in ('false', 'f', '0', 'no', 'n'): + return False + self.fail('%s is not a valid boolean' % value, param, ctx) + + def __repr__(self): + return 'BOOL' + + +class UUIDParameterType(ParamType): + name = 'uuid' + + def convert(self, value, param, ctx): + import uuid + try: + if PY2 and isinstance(value, text_type): + value = value.encode('ascii') + return uuid.UUID(value) + except (UnicodeError, ValueError): + self.fail('%s is not a valid UUID value' % value, param, ctx) + + def __repr__(self): + return 'UUID' + + +class File(ParamType): + """Declares a parameter to be a file for reading or writing. The file + is automatically closed once the context tears down (after the command + finished working). + + Files can be opened for reading or writing. The special value ``-`` + indicates stdin or stdout depending on the mode. + + By default, the file is opened for reading text data, but it can also be + opened in binary mode or for writing. The encoding parameter can be used + to force a specific encoding. + + The `lazy` flag controls if the file should be opened immediately or upon + first IO. The default is to be non-lazy for standard input and output + streams as well as files opened for reading, `lazy` otherwise. When opening a + file lazily for reading, it is still opened temporarily for validation, but + will not be held open until first IO. lazy is mainly useful when opening + for writing to avoid creating the file until it is needed. + + Starting with Click 2.0, files can also be opened atomically in which + case all writes go into a separate file in the same folder and upon + completion the file will be moved over to the original location. This + is useful if a file regularly read by other users is modified. + + See :ref:`file-args` for more information. + """ + name = 'filename' + envvar_list_splitter = os.path.pathsep + + def __init__(self, mode='r', encoding=None, errors='strict', lazy=None, + atomic=False): + self.mode = mode + self.encoding = encoding + self.errors = errors + self.lazy = lazy + self.atomic = atomic + + def resolve_lazy_flag(self, value): + if self.lazy is not None: + return self.lazy + if value == '-': + return False + elif 'w' in self.mode: + return True + return False + + def convert(self, value, param, ctx): + try: + if hasattr(value, 'read') or hasattr(value, 'write'): + return value + + lazy = self.resolve_lazy_flag(value) + + if lazy: + f = LazyFile(value, self.mode, self.encoding, self.errors, + atomic=self.atomic) + if ctx is not None: + ctx.call_on_close(f.close_intelligently) + return f + + f, should_close = open_stream(value, self.mode, + self.encoding, self.errors, + atomic=self.atomic) + # If a context is provided, we automatically close the file + # at the end of the context execution (or flush out). If a + # context does not exist, it's the caller's responsibility to + # properly close the file. This for instance happens when the + # type is used with prompts. + if ctx is not None: + if should_close: + ctx.call_on_close(safecall(f.close)) + else: + ctx.call_on_close(safecall(f.flush)) + return f + except (IOError, OSError) as e: + self.fail('Could not open file: %s: %s' % ( + filename_to_ui(value), + get_streerror(e), + ), param, ctx) + + +class Path(ParamType): + """The path type is similar to the :class:`File` type but it performs + different checks. First of all, instead of returning an open file + handle it returns just the filename. Secondly, it can perform various + basic checks about what the file or directory should be. + + .. versionchanged:: 6.0 + `allow_dash` was added. + + :param exists: if set to true, the file or directory needs to exist for + this value to be valid. If this is not required and a + file does indeed not exist, then all further checks are + silently skipped. + :param file_okay: controls if a file is a possible value. + :param dir_okay: controls if a directory is a possible value. + :param writable: if true, a writable check is performed. + :param readable: if true, a readable check is performed. + :param resolve_path: if this is true, then the path is fully resolved + before the value is passed onwards. This means + that it's absolute and symlinks are resolved. It + will not expand a tilde-prefix, as this is + supposed to be done by the shell only. + :param allow_dash: If this is set to `True`, a single dash to indicate + standard streams is permitted. + :param path_type: optionally a string type that should be used to + represent the path. The default is `None` which + means the return value will be either bytes or + unicode depending on what makes most sense given the + input data Click deals with. + """ + envvar_list_splitter = os.path.pathsep + + def __init__(self, exists=False, file_okay=True, dir_okay=True, + writable=False, readable=True, resolve_path=False, + allow_dash=False, path_type=None): + self.exists = exists + self.file_okay = file_okay + self.dir_okay = dir_okay + self.writable = writable + self.readable = readable + self.resolve_path = resolve_path + self.allow_dash = allow_dash + self.type = path_type + + if self.file_okay and not self.dir_okay: + self.name = 'file' + self.path_type = 'File' + elif self.dir_okay and not self.file_okay: + self.name = 'directory' + self.path_type = 'Directory' + else: + self.name = 'path' + self.path_type = 'Path' + + def coerce_path_result(self, rv): + if self.type is not None and not isinstance(rv, self.type): + if self.type is text_type: + rv = rv.decode(get_filesystem_encoding()) + else: + rv = rv.encode(get_filesystem_encoding()) + return rv + + def convert(self, value, param, ctx): + rv = value + + is_dash = self.file_okay and self.allow_dash and rv in (b'-', '-') + + if not is_dash: + if self.resolve_path: + rv = os.path.realpath(rv) + + try: + st = os.stat(rv) + except OSError: + if not self.exists: + return self.coerce_path_result(rv) + self.fail('%s "%s" does not exist.' % ( + self.path_type, + filename_to_ui(value) + ), param, ctx) + + if not self.file_okay and stat.S_ISREG(st.st_mode): + self.fail('%s "%s" is a file.' % ( + self.path_type, + filename_to_ui(value) + ), param, ctx) + if not self.dir_okay and stat.S_ISDIR(st.st_mode): + self.fail('%s "%s" is a directory.' % ( + self.path_type, + filename_to_ui(value) + ), param, ctx) + if self.writable and not os.access(value, os.W_OK): + self.fail('%s "%s" is not writable.' % ( + self.path_type, + filename_to_ui(value) + ), param, ctx) + if self.readable and not os.access(value, os.R_OK): + self.fail('%s "%s" is not readable.' % ( + self.path_type, + filename_to_ui(value) + ), param, ctx) + + return self.coerce_path_result(rv) + + +class Tuple(CompositeParamType): + """The default behavior of Click is to apply a type on a value directly. + This works well in most cases, except for when `nargs` is set to a fixed + count and different types should be used for different items. In this + case the :class:`Tuple` type can be used. This type can only be used + if `nargs` is set to a fixed number. + + For more information see :ref:`tuple-type`. + + This can be selected by using a Python tuple literal as a type. + + :param types: a list of types that should be used for the tuple items. + """ + + def __init__(self, types): + self.types = [convert_type(ty) for ty in types] + + @property + def name(self): + return "<" + " ".join(ty.name for ty in self.types) + ">" + + @property + def arity(self): + return len(self.types) + + def convert(self, value, param, ctx): + if len(value) != len(self.types): + raise TypeError('It would appear that nargs is set to conflict ' + 'with the composite type arity.') + return tuple(ty(x, param, ctx) for ty, x in zip(self.types, value)) + + +def convert_type(ty, default=None): + """Converts a callable or python ty into the most appropriate param + ty. + """ + guessed_type = False + if ty is None and default is not None: + if isinstance(default, tuple): + ty = tuple(map(type, default)) + else: + ty = type(default) + guessed_type = True + + if isinstance(ty, tuple): + return Tuple(ty) + if isinstance(ty, ParamType): + return ty + if ty is text_type or ty is str or ty is None: + return STRING + if ty is int: + return INT + # Booleans are only okay if not guessed. This is done because for + # flags the default value is actually a bit of a lie in that it + # indicates which of the flags is the one we want. See get_default() + # for more information. + if ty is bool and not guessed_type: + return BOOL + if ty is float: + return FLOAT + if guessed_type: + return STRING + + # Catch a common mistake + if __debug__: + try: + if issubclass(ty, ParamType): + raise AssertionError('Attempted to use an uninstantiated ' + 'parameter type (%s).' % ty) + except TypeError: + pass + return FuncParamType(ty) + + +#: A dummy parameter type that just does nothing. From a user's +#: perspective this appears to just be the same as `STRING` but internally +#: no string conversion takes place. This is necessary to achieve the +#: same bytes/unicode behavior on Python 2/3 in situations where you want +#: to not convert argument types. This is usually useful when working +#: with file paths as they can appear in bytes and unicode. +#: +#: For path related uses the :class:`Path` type is a better choice but +#: there are situations where an unprocessed type is useful which is why +#: it is is provided. +#: +#: .. versionadded:: 4.0 +UNPROCESSED = UnprocessedParamType() + +#: A unicode string parameter type which is the implicit default. This +#: can also be selected by using ``str`` as type. +STRING = StringParamType() + +#: An integer parameter. This can also be selected by using ``int`` as +#: type. +INT = IntParamType() + +#: A floating point value parameter. This can also be selected by using +#: ``float`` as type. +FLOAT = FloatParamType() + +#: A boolean parameter. This is the default for boolean flags. This can +#: also be selected by using ``bool`` as a type. +BOOL = BoolParamType() + +#: A UUID parameter. +UUID = UUIDParameterType() diff --git a/venv/lib/python3.7/site-packages/click/utils.py b/venv/lib/python3.7/site-packages/click/utils.py new file mode 100644 index 0000000..fc84369 --- /dev/null +++ b/venv/lib/python3.7/site-packages/click/utils.py @@ -0,0 +1,440 @@ +import os +import sys + +from .globals import resolve_color_default + +from ._compat import text_type, open_stream, get_filesystem_encoding, \ + get_streerror, string_types, PY2, binary_streams, text_streams, \ + filename_to_ui, auto_wrap_for_ansi, strip_ansi, should_strip_ansi, \ + _default_text_stdout, _default_text_stderr, is_bytes, WIN + +if not PY2: + from ._compat import _find_binary_writer +elif WIN: + from ._winconsole import _get_windows_argv, \ + _hash_py_argv, _initial_argv_hash + + +echo_native_types = string_types + (bytes, bytearray) + + +def _posixify(name): + return '-'.join(name.split()).lower() + + +def safecall(func): + """Wraps a function so that it swallows exceptions.""" + def wrapper(*args, **kwargs): + try: + return func(*args, **kwargs) + except Exception: + pass + return wrapper + + +def make_str(value): + """Converts a value into a valid string.""" + if isinstance(value, bytes): + try: + return value.decode(get_filesystem_encoding()) + except UnicodeError: + return value.decode('utf-8', 'replace') + return text_type(value) + + +def make_default_short_help(help, max_length=45): + """Return a condensed version of help string.""" + words = help.split() + total_length = 0 + result = [] + done = False + + for word in words: + if word[-1:] == '.': + done = True + new_length = result and 1 + len(word) or len(word) + if total_length + new_length > max_length: + result.append('...') + done = True + else: + if result: + result.append(' ') + result.append(word) + if done: + break + total_length += new_length + + return ''.join(result) + + +class LazyFile(object): + """A lazy file works like a regular file but it does not fully open + the file but it does perform some basic checks early to see if the + filename parameter does make sense. This is useful for safely opening + files for writing. + """ + + def __init__(self, filename, mode='r', encoding=None, errors='strict', + atomic=False): + self.name = filename + self.mode = mode + self.encoding = encoding + self.errors = errors + self.atomic = atomic + + if filename == '-': + self._f, self.should_close = open_stream(filename, mode, + encoding, errors) + else: + if 'r' in mode: + # Open and close the file in case we're opening it for + # reading so that we can catch at least some errors in + # some cases early. + open(filename, mode).close() + self._f = None + self.should_close = True + + def __getattr__(self, name): + return getattr(self.open(), name) + + def __repr__(self): + if self._f is not None: + return repr(self._f) + return '' % (self.name, self.mode) + + def open(self): + """Opens the file if it's not yet open. This call might fail with + a :exc:`FileError`. Not handling this error will produce an error + that Click shows. + """ + if self._f is not None: + return self._f + try: + rv, self.should_close = open_stream(self.name, self.mode, + self.encoding, + self.errors, + atomic=self.atomic) + except (IOError, OSError) as e: + from .exceptions import FileError + raise FileError(self.name, hint=get_streerror(e)) + self._f = rv + return rv + + def close(self): + """Closes the underlying file, no matter what.""" + if self._f is not None: + self._f.close() + + def close_intelligently(self): + """This function only closes the file if it was opened by the lazy + file wrapper. For instance this will never close stdin. + """ + if self.should_close: + self.close() + + def __enter__(self): + return self + + def __exit__(self, exc_type, exc_value, tb): + self.close_intelligently() + + def __iter__(self): + self.open() + return iter(self._f) + + +class KeepOpenFile(object): + + def __init__(self, file): + self._file = file + + def __getattr__(self, name): + return getattr(self._file, name) + + def __enter__(self): + return self + + def __exit__(self, exc_type, exc_value, tb): + pass + + def __repr__(self): + return repr(self._file) + + def __iter__(self): + return iter(self._file) + + +def echo(message=None, file=None, nl=True, err=False, color=None): + """Prints a message plus a newline to the given file or stdout. On + first sight, this looks like the print function, but it has improved + support for handling Unicode and binary data that does not fail no + matter how badly configured the system is. + + Primarily it means that you can print binary data as well as Unicode + data on both 2.x and 3.x to the given file in the most appropriate way + possible. This is a very carefree function in that it will try its + best to not fail. As of Click 6.0 this includes support for unicode + output on the Windows console. + + In addition to that, if `colorama`_ is installed, the echo function will + also support clever handling of ANSI codes. Essentially it will then + do the following: + + - add transparent handling of ANSI color codes on Windows. + - hide ANSI codes automatically if the destination file is not a + terminal. + + .. _colorama: https://pypi.org/project/colorama/ + + .. versionchanged:: 6.0 + As of Click 6.0 the echo function will properly support unicode + output on the windows console. Not that click does not modify + the interpreter in any way which means that `sys.stdout` or the + print statement or function will still not provide unicode support. + + .. versionchanged:: 2.0 + Starting with version 2.0 of Click, the echo function will work + with colorama if it's installed. + + .. versionadded:: 3.0 + The `err` parameter was added. + + .. versionchanged:: 4.0 + Added the `color` flag. + + :param message: the message to print + :param file: the file to write to (defaults to ``stdout``) + :param err: if set to true the file defaults to ``stderr`` instead of + ``stdout``. This is faster and easier than calling + :func:`get_text_stderr` yourself. + :param nl: if set to `True` (the default) a newline is printed afterwards. + :param color: controls if the terminal supports ANSI colors or not. The + default is autodetection. + """ + if file is None: + if err: + file = _default_text_stderr() + else: + file = _default_text_stdout() + + # Convert non bytes/text into the native string type. + if message is not None and not isinstance(message, echo_native_types): + message = text_type(message) + + if nl: + message = message or u'' + if isinstance(message, text_type): + message += u'\n' + else: + message += b'\n' + + # If there is a message, and we're in Python 3, and the value looks + # like bytes, we manually need to find the binary stream and write the + # message in there. This is done separately so that most stream + # types will work as you would expect. Eg: you can write to StringIO + # for other cases. + if message and not PY2 and is_bytes(message): + binary_file = _find_binary_writer(file) + if binary_file is not None: + file.flush() + binary_file.write(message) + binary_file.flush() + return + + # ANSI-style support. If there is no message or we are dealing with + # bytes nothing is happening. If we are connected to a file we want + # to strip colors. If we are on windows we either wrap the stream + # to strip the color or we use the colorama support to translate the + # ansi codes to API calls. + if message and not is_bytes(message): + color = resolve_color_default(color) + if should_strip_ansi(file, color): + message = strip_ansi(message) + elif WIN: + if auto_wrap_for_ansi is not None: + file = auto_wrap_for_ansi(file) + elif not color: + message = strip_ansi(message) + + if message: + file.write(message) + file.flush() + + +def get_binary_stream(name): + """Returns a system stream for byte processing. This essentially + returns the stream from the sys module with the given name but it + solves some compatibility issues between different Python versions. + Primarily this function is necessary for getting binary streams on + Python 3. + + :param name: the name of the stream to open. Valid names are ``'stdin'``, + ``'stdout'`` and ``'stderr'`` + """ + opener = binary_streams.get(name) + if opener is None: + raise TypeError('Unknown standard stream %r' % name) + return opener() + + +def get_text_stream(name, encoding=None, errors='strict'): + """Returns a system stream for text processing. This usually returns + a wrapped stream around a binary stream returned from + :func:`get_binary_stream` but it also can take shortcuts on Python 3 + for already correctly configured streams. + + :param name: the name of the stream to open. Valid names are ``'stdin'``, + ``'stdout'`` and ``'stderr'`` + :param encoding: overrides the detected default encoding. + :param errors: overrides the default error mode. + """ + opener = text_streams.get(name) + if opener is None: + raise TypeError('Unknown standard stream %r' % name) + return opener(encoding, errors) + + +def open_file(filename, mode='r', encoding=None, errors='strict', + lazy=False, atomic=False): + """This is similar to how the :class:`File` works but for manual + usage. Files are opened non lazy by default. This can open regular + files as well as stdin/stdout if ``'-'`` is passed. + + If stdin/stdout is returned the stream is wrapped so that the context + manager will not close the stream accidentally. This makes it possible + to always use the function like this without having to worry to + accidentally close a standard stream:: + + with open_file(filename) as f: + ... + + .. versionadded:: 3.0 + + :param filename: the name of the file to open (or ``'-'`` for stdin/stdout). + :param mode: the mode in which to open the file. + :param encoding: the encoding to use. + :param errors: the error handling for this file. + :param lazy: can be flipped to true to open the file lazily. + :param atomic: in atomic mode writes go into a temporary file and it's + moved on close. + """ + if lazy: + return LazyFile(filename, mode, encoding, errors, atomic=atomic) + f, should_close = open_stream(filename, mode, encoding, errors, + atomic=atomic) + if not should_close: + f = KeepOpenFile(f) + return f + + +def get_os_args(): + """This returns the argument part of sys.argv in the most appropriate + form for processing. What this means is that this return value is in + a format that works for Click to process but does not necessarily + correspond well to what's actually standard for the interpreter. + + On most environments the return value is ``sys.argv[:1]`` unchanged. + However if you are on Windows and running Python 2 the return value + will actually be a list of unicode strings instead because the + default behavior on that platform otherwise will not be able to + carry all possible values that sys.argv can have. + + .. versionadded:: 6.0 + """ + # We can only extract the unicode argv if sys.argv has not been + # changed since the startup of the application. + if PY2 and WIN and _initial_argv_hash == _hash_py_argv(): + return _get_windows_argv() + return sys.argv[1:] + + +def format_filename(filename, shorten=False): + """Formats a filename for user display. The main purpose of this + function is to ensure that the filename can be displayed at all. This + will decode the filename to unicode if necessary in a way that it will + not fail. Optionally, it can shorten the filename to not include the + full path to the filename. + + :param filename: formats a filename for UI display. This will also convert + the filename into unicode without failing. + :param shorten: this optionally shortens the filename to strip of the + path that leads up to it. + """ + if shorten: + filename = os.path.basename(filename) + return filename_to_ui(filename) + + +def get_app_dir(app_name, roaming=True, force_posix=False): + r"""Returns the config folder for the application. The default behavior + is to return whatever is most appropriate for the operating system. + + To give you an idea, for an app called ``"Foo Bar"``, something like + the following folders could be returned: + + Mac OS X: + ``~/Library/Application Support/Foo Bar`` + Mac OS X (POSIX): + ``~/.foo-bar`` + Unix: + ``~/.config/foo-bar`` + Unix (POSIX): + ``~/.foo-bar`` + Win XP (roaming): + ``C:\Documents and Settings\\Local Settings\Application Data\Foo Bar`` + Win XP (not roaming): + ``C:\Documents and Settings\\Application Data\Foo Bar`` + Win 7 (roaming): + ``C:\Users\\AppData\Roaming\Foo Bar`` + Win 7 (not roaming): + ``C:\Users\\AppData\Local\Foo Bar`` + + .. versionadded:: 2.0 + + :param app_name: the application name. This should be properly capitalized + and can contain whitespace. + :param roaming: controls if the folder should be roaming or not on Windows. + Has no affect otherwise. + :param force_posix: if this is set to `True` then on any POSIX system the + folder will be stored in the home folder with a leading + dot instead of the XDG config home or darwin's + application support folder. + """ + if WIN: + key = roaming and 'APPDATA' or 'LOCALAPPDATA' + folder = os.environ.get(key) + if folder is None: + folder = os.path.expanduser('~') + return os.path.join(folder, app_name) + if force_posix: + return os.path.join(os.path.expanduser('~/.' + _posixify(app_name))) + if sys.platform == 'darwin': + return os.path.join(os.path.expanduser( + '~/Library/Application Support'), app_name) + return os.path.join( + os.environ.get('XDG_CONFIG_HOME', os.path.expanduser('~/.config')), + _posixify(app_name)) + + +class PacifyFlushWrapper(object): + """This wrapper is used to catch and suppress BrokenPipeErrors resulting + from ``.flush()`` being called on broken pipe during the shutdown/final-GC + of the Python interpreter. Notably ``.flush()`` is always called on + ``sys.stdout`` and ``sys.stderr``. So as to have minimal impact on any + other cleanup code, and the case where the underlying file is not a broken + pipe, all calls and attributes are proxied. + """ + + def __init__(self, wrapped): + self.wrapped = wrapped + + def flush(self): + try: + self.wrapped.flush() + except IOError as e: + import errno + if e.errno != errno.EPIPE: + raise + + def __getattr__(self, attr): + return getattr(self.wrapped, attr) diff --git a/venv/lib/python3.7/site-packages/easy_install.py b/venv/lib/python3.7/site-packages/easy_install.py new file mode 100644 index 0000000..d87e984 --- /dev/null +++ b/venv/lib/python3.7/site-packages/easy_install.py @@ -0,0 +1,5 @@ +"""Run the EasyInstall command""" + +if __name__ == '__main__': + from setuptools.command.easy_install import main + main() diff --git a/venv/lib/python3.7/site-packages/flask/__init__.py b/venv/lib/python3.7/site-packages/flask/__init__.py new file mode 100644 index 0000000..59f0fff --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/__init__.py @@ -0,0 +1,49 @@ +# -*- coding: utf-8 -*- +""" + flask + ~~~~~ + + A microframework based on Werkzeug. It's extensively documented + and follows best practice patterns. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +__version__ = '1.0.3' + +# utilities we import from Werkzeug and Jinja2 that are unused +# in the module but are exported as public interface. +from werkzeug.exceptions import abort +from werkzeug.utils import redirect +from jinja2 import Markup, escape + +from .app import Flask, Request, Response +from .config import Config +from .helpers import url_for, flash, send_file, send_from_directory, \ + get_flashed_messages, get_template_attribute, make_response, safe_join, \ + stream_with_context +from .globals import current_app, g, request, session, _request_ctx_stack, \ + _app_ctx_stack +from .ctx import has_request_context, has_app_context, \ + after_this_request, copy_current_request_context +from .blueprints import Blueprint +from .templating import render_template, render_template_string + +# the signals +from .signals import signals_available, template_rendered, request_started, \ + request_finished, got_request_exception, request_tearing_down, \ + appcontext_tearing_down, appcontext_pushed, \ + appcontext_popped, message_flashed, before_render_template + +# We're not exposing the actual json module but a convenient wrapper around +# it. +from . import json + +# This was the only thing that Flask used to export at one point and it had +# a more generic name. +jsonify = json.jsonify + +# backwards compat, goes away in 1.0 +from .sessions import SecureCookieSession as Session +json_available = True diff --git a/venv/lib/python3.7/site-packages/flask/__main__.py b/venv/lib/python3.7/site-packages/flask/__main__.py new file mode 100644 index 0000000..4aee654 --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/__main__.py @@ -0,0 +1,14 @@ +# -*- coding: utf-8 -*- +""" + flask.__main__ + ~~~~~~~~~~~~~~ + + Alias for flask.run for the command line. + + :copyright: © 2010 by the Pallets team. + 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b/venv/lib/python3.7/site-packages/flask/__pycache__/wrappers.cpython-37.pyc differ diff --git a/venv/lib/python3.7/site-packages/flask/_compat.py b/venv/lib/python3.7/site-packages/flask/_compat.py new file mode 100644 index 0000000..dfbaae9 --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/_compat.py @@ -0,0 +1,101 @@ +# -*- coding: utf-8 -*- +""" + flask._compat + ~~~~~~~~~~~~~ + + Some py2/py3 compatibility support based on a stripped down + version of six so we don't have to depend on a specific version + of it. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +import sys + +PY2 = sys.version_info[0] == 2 +_identity = lambda x: x + + +if not PY2: + text_type = str + string_types = (str,) + integer_types = (int,) + + iterkeys = lambda d: iter(d.keys()) + itervalues = lambda d: iter(d.values()) + iteritems = lambda d: iter(d.items()) + + from inspect import getfullargspec as getargspec + from io import StringIO + import collections.abc as collections_abc + + def reraise(tp, value, tb=None): + if value.__traceback__ is not tb: + raise value.with_traceback(tb) + raise value + + implements_to_string = _identity + +else: + text_type = unicode + string_types = (str, unicode) + integer_types = (int, long) + + iterkeys = lambda d: d.iterkeys() + itervalues = lambda d: d.itervalues() + iteritems = lambda d: d.iteritems() + + from inspect import getargspec + from cStringIO import StringIO + import collections as collections_abc + + exec('def reraise(tp, value, tb=None):\n raise tp, value, tb') + + def implements_to_string(cls): + cls.__unicode__ = cls.__str__ + cls.__str__ = lambda x: x.__unicode__().encode('utf-8') + return cls + + +def with_metaclass(meta, *bases): + """Create a base class with a metaclass.""" + # This requires a bit of explanation: the basic idea is to make a + # dummy metaclass for one level of class instantiation that replaces + # itself with the actual metaclass. + class metaclass(type): + def __new__(cls, name, this_bases, d): + return meta(name, bases, d) + return type.__new__(metaclass, 'temporary_class', (), {}) + + +# Certain versions of pypy have a bug where clearing the exception stack +# breaks the __exit__ function in a very peculiar way. The second level of +# exception blocks is necessary because pypy seems to forget to check if an +# exception happened until the next bytecode instruction? +# +# Relevant PyPy bugfix commit: +# https://bitbucket.org/pypy/pypy/commits/77ecf91c635a287e88e60d8ddb0f4e9df4003301 +# According to ronan on #pypy IRC, it is released in PyPy2 2.3 and later +# versions. +# +# Ubuntu 14.04 has PyPy 2.2.1, which does exhibit this bug. +BROKEN_PYPY_CTXMGR_EXIT = False +if hasattr(sys, 'pypy_version_info'): + class _Mgr(object): + def __enter__(self): + return self + def __exit__(self, *args): + if hasattr(sys, 'exc_clear'): + # Python 3 (PyPy3) doesn't have exc_clear + sys.exc_clear() + try: + try: + with _Mgr(): + raise AssertionError() + except: + raise + except TypeError: + BROKEN_PYPY_CTXMGR_EXIT = True + except AssertionError: + pass diff --git a/venv/lib/python3.7/site-packages/flask/app.py b/venv/lib/python3.7/site-packages/flask/app.py new file mode 100644 index 0000000..c570a95 --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/app.py @@ -0,0 +1,2334 @@ +# -*- coding: utf-8 -*- +""" + flask.app + ~~~~~~~~~ + + This module implements the central WSGI application object. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +import os +import sys +import warnings +from datetime import timedelta +from functools import update_wrapper +from itertools import chain +from threading import Lock + +from werkzeug.datastructures import Headers, ImmutableDict +from werkzeug.exceptions import BadRequest, BadRequestKeyError, HTTPException, \ + InternalServerError, MethodNotAllowed, default_exceptions +from werkzeug.routing import BuildError, Map, RequestRedirect, \ + RoutingException, Rule + +from . import cli, json +from ._compat import integer_types, reraise, string_types, text_type +from .config import Config, ConfigAttribute +from .ctx import AppContext, RequestContext, _AppCtxGlobals +from .globals import _request_ctx_stack, g, request, session +from .helpers import ( + _PackageBoundObject, + _endpoint_from_view_func, find_package, get_env, get_debug_flag, + get_flashed_messages, locked_cached_property, url_for, get_load_dotenv +) +from .logging import create_logger +from .sessions import SecureCookieSessionInterface +from .signals import appcontext_tearing_down, got_request_exception, \ + request_finished, request_started, request_tearing_down +from .templating import DispatchingJinjaLoader, Environment, \ + _default_template_ctx_processor +from .wrappers import Request, Response + +# a singleton sentinel value for parameter defaults +_sentinel = object() + + +def _make_timedelta(value): + if not isinstance(value, timedelta): + return timedelta(seconds=value) + return value + + +def setupmethod(f): + """Wraps a method so that it performs a check in debug mode if the + first request was already handled. + """ + def wrapper_func(self, *args, **kwargs): + if self.debug and self._got_first_request: + raise AssertionError('A setup function was called after the ' + 'first request was handled. This usually indicates a bug ' + 'in the application where a module was not imported ' + 'and decorators or other functionality was called too late.\n' + 'To fix this make sure to import all your view modules, ' + 'database models and everything related at a central place ' + 'before the application starts serving requests.') + return f(self, *args, **kwargs) + return update_wrapper(wrapper_func, f) + + +class Flask(_PackageBoundObject): + """The flask object implements a WSGI application and acts as the central + object. It is passed the name of the module or package of the + application. Once it is created it will act as a central registry for + the view functions, the URL rules, template configuration and much more. + + The name of the package is used to resolve resources from inside the + package or the folder the module is contained in depending on if the + package parameter resolves to an actual python package (a folder with + an :file:`__init__.py` file inside) or a standard module (just a ``.py`` file). + + For more information about resource loading, see :func:`open_resource`. + + Usually you create a :class:`Flask` instance in your main module or + in the :file:`__init__.py` file of your package like this:: + + from flask import Flask + app = Flask(__name__) + + .. admonition:: About the First Parameter + + The idea of the first parameter is to give Flask an idea of what + belongs to your application. This name is used to find resources + on the filesystem, can be used by extensions to improve debugging + information and a lot more. + + So it's important what you provide there. If you are using a single + module, `__name__` is always the correct value. If you however are + using a package, it's usually recommended to hardcode the name of + your package there. + + For example if your application is defined in :file:`yourapplication/app.py` + you should create it with one of the two versions below:: + + app = Flask('yourapplication') + app = Flask(__name__.split('.')[0]) + + Why is that? The application will work even with `__name__`, thanks + to how resources are looked up. However it will make debugging more + painful. Certain extensions can make assumptions based on the + import name of your application. For example the Flask-SQLAlchemy + extension will look for the code in your application that triggered + an SQL query in debug mode. If the import name is not properly set + up, that debugging information is lost. (For example it would only + pick up SQL queries in `yourapplication.app` and not + `yourapplication.views.frontend`) + + .. versionadded:: 0.7 + The `static_url_path`, `static_folder`, and `template_folder` + parameters were added. + + .. versionadded:: 0.8 + The `instance_path` and `instance_relative_config` parameters were + added. + + .. versionadded:: 0.11 + The `root_path` parameter was added. + + .. versionadded:: 1.0 + The ``host_matching`` and ``static_host`` parameters were added. + + .. versionadded:: 1.0 + The ``subdomain_matching`` parameter was added. Subdomain + matching needs to be enabled manually now. Setting + :data:`SERVER_NAME` does not implicitly enable it. + + :param import_name: the name of the application package + :param static_url_path: can be used to specify a different path for the + static files on the web. Defaults to the name + of the `static_folder` folder. + :param static_folder: the folder with static files that should be served + at `static_url_path`. Defaults to the ``'static'`` + folder in the root path of the application. + :param static_host: the host to use when adding the static route. + Defaults to None. Required when using ``host_matching=True`` + with a ``static_folder`` configured. + :param host_matching: set ``url_map.host_matching`` attribute. + Defaults to False. + :param subdomain_matching: consider the subdomain relative to + :data:`SERVER_NAME` when matching routes. Defaults to False. + :param template_folder: the folder that contains the templates that should + be used by the application. Defaults to + ``'templates'`` folder in the root path of the + application. + :param instance_path: An alternative instance path for the application. + By default the folder ``'instance'`` next to the + package or module is assumed to be the instance + path. + :param instance_relative_config: if set to ``True`` relative filenames + for loading the config are assumed to + be relative to the instance path instead + of the application root. + :param root_path: Flask by default will automatically calculate the path + to the root of the application. In certain situations + this cannot be achieved (for instance if the package + is a Python 3 namespace package) and needs to be + manually defined. + """ + + #: The class that is used for request objects. See :class:`~flask.Request` + #: for more information. + request_class = Request + + #: The class that is used for response objects. See + #: :class:`~flask.Response` for more information. + response_class = Response + + #: The class that is used for the Jinja environment. + #: + #: .. versionadded:: 0.11 + jinja_environment = Environment + + #: The class that is used for the :data:`~flask.g` instance. + #: + #: Example use cases for a custom class: + #: + #: 1. Store arbitrary attributes on flask.g. + #: 2. Add a property for lazy per-request database connectors. + #: 3. Return None instead of AttributeError on unexpected attributes. + #: 4. Raise exception if an unexpected attr is set, a "controlled" flask.g. + #: + #: In Flask 0.9 this property was called `request_globals_class` but it + #: was changed in 0.10 to :attr:`app_ctx_globals_class` because the + #: flask.g object is now application context scoped. + #: + #: .. versionadded:: 0.10 + app_ctx_globals_class = _AppCtxGlobals + + #: The class that is used for the ``config`` attribute of this app. + #: Defaults to :class:`~flask.Config`. + #: + #: Example use cases for a custom class: + #: + #: 1. Default values for certain config options. + #: 2. Access to config values through attributes in addition to keys. + #: + #: .. versionadded:: 0.11 + config_class = Config + + #: The testing flag. Set this to ``True`` to enable the test mode of + #: Flask extensions (and in the future probably also Flask itself). + #: For example this might activate test helpers that have an + #: additional runtime cost which should not be enabled by default. + #: + #: If this is enabled and PROPAGATE_EXCEPTIONS is not changed from the + #: default it's implicitly enabled. + #: + #: This attribute can also be configured from the config with the + #: ``TESTING`` configuration key. Defaults to ``False``. + testing = ConfigAttribute('TESTING') + + #: If a secret key is set, cryptographic components can use this to + #: sign cookies and other things. Set this to a complex random value + #: when you want to use the secure cookie for instance. + #: + #: This attribute can also be configured from the config with the + #: :data:`SECRET_KEY` configuration key. Defaults to ``None``. + secret_key = ConfigAttribute('SECRET_KEY') + + #: The secure cookie uses this for the name of the session cookie. + #: + #: This attribute can also be configured from the config with the + #: ``SESSION_COOKIE_NAME`` configuration key. Defaults to ``'session'`` + session_cookie_name = ConfigAttribute('SESSION_COOKIE_NAME') + + #: A :class:`~datetime.timedelta` which is used to set the expiration + #: date of a permanent session. The default is 31 days which makes a + #: permanent session survive for roughly one month. + #: + #: This attribute can also be configured from the config with the + #: ``PERMANENT_SESSION_LIFETIME`` configuration key. Defaults to + #: ``timedelta(days=31)`` + permanent_session_lifetime = ConfigAttribute('PERMANENT_SESSION_LIFETIME', + get_converter=_make_timedelta) + + #: A :class:`~datetime.timedelta` which is used as default cache_timeout + #: for the :func:`send_file` functions. The default is 12 hours. + #: + #: This attribute can also be configured from the config with the + #: ``SEND_FILE_MAX_AGE_DEFAULT`` configuration key. This configuration + #: variable can also be set with an integer value used as seconds. + #: Defaults to ``timedelta(hours=12)`` + send_file_max_age_default = ConfigAttribute('SEND_FILE_MAX_AGE_DEFAULT', + get_converter=_make_timedelta) + + #: Enable this if you want to use the X-Sendfile feature. Keep in + #: mind that the server has to support this. This only affects files + #: sent with the :func:`send_file` method. + #: + #: .. versionadded:: 0.2 + #: + #: This attribute can also be configured from the config with the + #: ``USE_X_SENDFILE`` configuration key. Defaults to ``False``. + use_x_sendfile = ConfigAttribute('USE_X_SENDFILE') + + #: The JSON encoder class to use. Defaults to :class:`~flask.json.JSONEncoder`. + #: + #: .. versionadded:: 0.10 + json_encoder = json.JSONEncoder + + #: The JSON decoder class to use. Defaults to :class:`~flask.json.JSONDecoder`. + #: + #: .. versionadded:: 0.10 + json_decoder = json.JSONDecoder + + #: Options that are passed directly to the Jinja2 environment. + jinja_options = ImmutableDict( + extensions=['jinja2.ext.autoescape', 'jinja2.ext.with_'] + ) + + #: Default configuration parameters. + default_config = ImmutableDict({ + 'ENV': None, + 'DEBUG': None, + 'TESTING': False, + 'PROPAGATE_EXCEPTIONS': None, + 'PRESERVE_CONTEXT_ON_EXCEPTION': None, + 'SECRET_KEY': None, + 'PERMANENT_SESSION_LIFETIME': timedelta(days=31), + 'USE_X_SENDFILE': False, + 'SERVER_NAME': None, + 'APPLICATION_ROOT': '/', + 'SESSION_COOKIE_NAME': 'session', + 'SESSION_COOKIE_DOMAIN': None, + 'SESSION_COOKIE_PATH': None, + 'SESSION_COOKIE_HTTPONLY': True, + 'SESSION_COOKIE_SECURE': False, + 'SESSION_COOKIE_SAMESITE': None, + 'SESSION_REFRESH_EACH_REQUEST': True, + 'MAX_CONTENT_LENGTH': None, + 'SEND_FILE_MAX_AGE_DEFAULT': timedelta(hours=12), + 'TRAP_BAD_REQUEST_ERRORS': None, + 'TRAP_HTTP_EXCEPTIONS': False, + 'EXPLAIN_TEMPLATE_LOADING': False, + 'PREFERRED_URL_SCHEME': 'http', + 'JSON_AS_ASCII': True, + 'JSON_SORT_KEYS': True, + 'JSONIFY_PRETTYPRINT_REGULAR': False, + 'JSONIFY_MIMETYPE': 'application/json', + 'TEMPLATES_AUTO_RELOAD': None, + 'MAX_COOKIE_SIZE': 4093, + }) + + #: The rule object to use for URL rules created. This is used by + #: :meth:`add_url_rule`. Defaults to :class:`werkzeug.routing.Rule`. + #: + #: .. versionadded:: 0.7 + url_rule_class = Rule + + #: the test client that is used with when `test_client` is used. + #: + #: .. versionadded:: 0.7 + test_client_class = None + + #: The :class:`~click.testing.CliRunner` subclass, by default + #: :class:`~flask.testing.FlaskCliRunner` that is used by + #: :meth:`test_cli_runner`. Its ``__init__`` method should take a + #: Flask app object as the first argument. + #: + #: .. versionadded:: 1.0 + test_cli_runner_class = None + + #: the session interface to use. By default an instance of + #: :class:`~flask.sessions.SecureCookieSessionInterface` is used here. + #: + #: .. versionadded:: 0.8 + session_interface = SecureCookieSessionInterface() + + # TODO remove the next three attrs when Sphinx :inherited-members: works + # https://github.com/sphinx-doc/sphinx/issues/741 + + #: The name of the package or module that this app belongs to. Do not + #: change this once it is set by the constructor. + import_name = None + + #: Location of the template files to be added to the template lookup. + #: ``None`` if templates should not be added. + template_folder = None + + #: Absolute path to the package on the filesystem. Used to look up + #: resources contained in the package. + root_path = None + + def __init__( + self, + import_name, + static_url_path=None, + static_folder='static', + static_host=None, + host_matching=False, + subdomain_matching=False, + template_folder='templates', + instance_path=None, + instance_relative_config=False, + root_path=None + ): + _PackageBoundObject.__init__( + self, + import_name, + template_folder=template_folder, + root_path=root_path + ) + + if static_url_path is not None: + self.static_url_path = static_url_path + + if static_folder is not None: + self.static_folder = static_folder + + if instance_path is None: + instance_path = self.auto_find_instance_path() + elif not os.path.isabs(instance_path): + raise ValueError( + 'If an instance path is provided it must be absolute.' + ' A relative path was given instead.' + ) + + #: Holds the path to the instance folder. + #: + #: .. versionadded:: 0.8 + self.instance_path = instance_path + + #: The configuration dictionary as :class:`Config`. This behaves + #: exactly like a regular dictionary but supports additional methods + #: to load a config from files. + self.config = self.make_config(instance_relative_config) + + #: A dictionary of all view functions registered. The keys will + #: be function names which are also used to generate URLs and + #: the values are the function objects themselves. + #: To register a view function, use the :meth:`route` decorator. + self.view_functions = {} + + #: A dictionary of all registered error handlers. The key is ``None`` + #: for error handlers active on the application, otherwise the key is + #: the name of the blueprint. Each key points to another dictionary + #: where the key is the status code of the http exception. The + #: special key ``None`` points to a list of tuples where the first item + #: is the class for the instance check and the second the error handler + #: function. + #: + #: To register an error handler, use the :meth:`errorhandler` + #: decorator. + self.error_handler_spec = {} + + #: A list of functions that are called when :meth:`url_for` raises a + #: :exc:`~werkzeug.routing.BuildError`. Each function registered here + #: is called with `error`, `endpoint` and `values`. If a function + #: returns ``None`` or raises a :exc:`BuildError` the next function is + #: tried. + #: + #: .. versionadded:: 0.9 + self.url_build_error_handlers = [] + + #: A dictionary with lists of functions that will be called at the + #: beginning of each request. The key of the dictionary is the name of + #: the blueprint this function is active for, or ``None`` for all + #: requests. To register a function, use the :meth:`before_request` + #: decorator. + self.before_request_funcs = {} + + #: A list of functions that will be called at the beginning of the + #: first request to this instance. To register a function, use the + #: :meth:`before_first_request` decorator. + #: + #: .. versionadded:: 0.8 + self.before_first_request_funcs = [] + + #: A dictionary with lists of functions that should be called after + #: each request. The key of the dictionary is the name of the blueprint + #: this function is active for, ``None`` for all requests. This can for + #: example be used to close database connections. To register a function + #: here, use the :meth:`after_request` decorator. + self.after_request_funcs = {} + + #: A dictionary with lists of functions that are called after + #: each request, even if an exception has occurred. The key of the + #: dictionary is the name of the blueprint this function is active for, + #: ``None`` for all requests. These functions are not allowed to modify + #: the request, and their return values are ignored. If an exception + #: occurred while processing the request, it gets passed to each + #: teardown_request function. To register a function here, use the + #: :meth:`teardown_request` decorator. + #: + #: .. versionadded:: 0.7 + self.teardown_request_funcs = {} + + #: A list of functions that are called when the application context + #: is destroyed. Since the application context is also torn down + #: if the request ends this is the place to store code that disconnects + #: from databases. + #: + #: .. versionadded:: 0.9 + self.teardown_appcontext_funcs = [] + + #: A dictionary with lists of functions that are called before the + #: :attr:`before_request_funcs` functions. The key of the dictionary is + #: the name of the blueprint this function is active for, or ``None`` + #: for all requests. To register a function, use + #: :meth:`url_value_preprocessor`. + #: + #: .. versionadded:: 0.7 + self.url_value_preprocessors = {} + + #: A dictionary with lists of functions that can be used as URL value + #: preprocessors. The key ``None`` here is used for application wide + #: callbacks, otherwise the key is the name of the blueprint. + #: Each of these functions has the chance to modify the dictionary + #: of URL values before they are used as the keyword arguments of the + #: view function. For each function registered this one should also + #: provide a :meth:`url_defaults` function that adds the parameters + #: automatically again that were removed that way. + #: + #: .. versionadded:: 0.7 + self.url_default_functions = {} + + #: A dictionary with list of functions that are called without argument + #: to populate the template context. The key of the dictionary is the + #: name of the blueprint this function is active for, ``None`` for all + #: requests. Each returns a dictionary that the template context is + #: updated with. To register a function here, use the + #: :meth:`context_processor` decorator. + self.template_context_processors = { + None: [_default_template_ctx_processor] + } + + #: A list of shell context processor functions that should be run + #: when a shell context is created. + #: + #: .. versionadded:: 0.11 + self.shell_context_processors = [] + + #: all the attached blueprints in a dictionary by name. Blueprints + #: can be attached multiple times so this dictionary does not tell + #: you how often they got attached. + #: + #: .. versionadded:: 0.7 + self.blueprints = {} + self._blueprint_order = [] + + #: a place where extensions can store application specific state. For + #: example this is where an extension could store database engines and + #: similar things. For backwards compatibility extensions should register + #: themselves like this:: + #: + #: if not hasattr(app, 'extensions'): + #: app.extensions = {} + #: app.extensions['extensionname'] = SomeObject() + #: + #: The key must match the name of the extension module. For example in + #: case of a "Flask-Foo" extension in `flask_foo`, the key would be + #: ``'foo'``. + #: + #: .. versionadded:: 0.7 + self.extensions = {} + + #: The :class:`~werkzeug.routing.Map` for this instance. You can use + #: this to change the routing converters after the class was created + #: but before any routes are connected. Example:: + #: + #: from werkzeug.routing import BaseConverter + #: + #: class ListConverter(BaseConverter): + #: def to_python(self, value): + #: return value.split(',') + #: def to_url(self, values): + #: return ','.join(super(ListConverter, self).to_url(value) + #: for value in values) + #: + #: app = Flask(__name__) + #: app.url_map.converters['list'] = ListConverter + self.url_map = Map() + + self.url_map.host_matching = host_matching + self.subdomain_matching = subdomain_matching + + # tracks internally if the application already handled at least one + # request. + self._got_first_request = False + self._before_request_lock = Lock() + + # Add a static route using the provided static_url_path, static_host, + # and static_folder if there is a configured static_folder. + # Note we do this without checking if static_folder exists. + # For one, it might be created while the server is running (e.g. during + # development). Also, Google App Engine stores static files somewhere + if self.has_static_folder: + assert bool(static_host) == host_matching, 'Invalid static_host/host_matching combination' + self.add_url_rule( + self.static_url_path + '/', + endpoint='static', + host=static_host, + view_func=self.send_static_file + ) + + #: The click command line context for this application. Commands + #: registered here show up in the :command:`flask` command once the + #: application has been discovered. The default commands are + #: provided by Flask itself and can be overridden. + #: + #: This is an instance of a :class:`click.Group` object. + self.cli = cli.AppGroup(self.name) + + @locked_cached_property + def name(self): + """The name of the application. This is usually the import name + with the difference that it's guessed from the run file if the + import name is main. This name is used as a display name when + Flask needs the name of the application. It can be set and overridden + to change the value. + + .. versionadded:: 0.8 + """ + if self.import_name == '__main__': + fn = getattr(sys.modules['__main__'], '__file__', None) + if fn is None: + return '__main__' + return os.path.splitext(os.path.basename(fn))[0] + return self.import_name + + @property + def propagate_exceptions(self): + """Returns the value of the ``PROPAGATE_EXCEPTIONS`` configuration + value in case it's set, otherwise a sensible default is returned. + + .. versionadded:: 0.7 + """ + rv = self.config['PROPAGATE_EXCEPTIONS'] + if rv is not None: + return rv + return self.testing or self.debug + + @property + def preserve_context_on_exception(self): + """Returns the value of the ``PRESERVE_CONTEXT_ON_EXCEPTION`` + configuration value in case it's set, otherwise a sensible default + is returned. + + .. versionadded:: 0.7 + """ + rv = self.config['PRESERVE_CONTEXT_ON_EXCEPTION'] + if rv is not None: + return rv + return self.debug + + @locked_cached_property + def logger(self): + """The ``'flask.app'`` logger, a standard Python + :class:`~logging.Logger`. + + In debug mode, the logger's :attr:`~logging.Logger.level` will be set + to :data:`~logging.DEBUG`. + + If there are no handlers configured, a default handler will be added. + See :ref:`logging` for more information. + + .. versionchanged:: 1.0 + Behavior was simplified. The logger is always named + ``flask.app``. The level is only set during configuration, it + doesn't check ``app.debug`` each time. Only one format is used, + not different ones depending on ``app.debug``. No handlers are + removed, and a handler is only added if no handlers are already + configured. + + .. versionadded:: 0.3 + """ + return create_logger(self) + + @locked_cached_property + def jinja_env(self): + """The Jinja2 environment used to load templates.""" + return self.create_jinja_environment() + + @property + def got_first_request(self): + """This attribute is set to ``True`` if the application started + handling the first request. + + .. versionadded:: 0.8 + """ + return self._got_first_request + + def make_config(self, instance_relative=False): + """Used to create the config attribute by the Flask constructor. + The `instance_relative` parameter is passed in from the constructor + of Flask (there named `instance_relative_config`) and indicates if + the config should be relative to the instance path or the root path + of the application. + + .. versionadded:: 0.8 + """ + root_path = self.root_path + if instance_relative: + root_path = self.instance_path + defaults = dict(self.default_config) + defaults['ENV'] = get_env() + defaults['DEBUG'] = get_debug_flag() + return self.config_class(root_path, defaults) + + def auto_find_instance_path(self): + """Tries to locate the instance path if it was not provided to the + constructor of the application class. It will basically calculate + the path to a folder named ``instance`` next to your main file or + the package. + + .. versionadded:: 0.8 + """ + prefix, package_path = find_package(self.import_name) + if prefix is None: + return os.path.join(package_path, 'instance') + return os.path.join(prefix, 'var', self.name + '-instance') + + def open_instance_resource(self, resource, mode='rb'): + """Opens a resource from the application's instance folder + (:attr:`instance_path`). Otherwise works like + :meth:`open_resource`. Instance resources can also be opened for + writing. + + :param resource: the name of the resource. To access resources within + subfolders use forward slashes as separator. + :param mode: resource file opening mode, default is 'rb'. + """ + return open(os.path.join(self.instance_path, resource), mode) + + def _get_templates_auto_reload(self): + """Reload templates when they are changed. Used by + :meth:`create_jinja_environment`. + + This attribute can be configured with :data:`TEMPLATES_AUTO_RELOAD`. If + not set, it will be enabled in debug mode. + + .. versionadded:: 1.0 + This property was added but the underlying config and behavior + already existed. + """ + rv = self.config['TEMPLATES_AUTO_RELOAD'] + return rv if rv is not None else self.debug + + def _set_templates_auto_reload(self, value): + self.config['TEMPLATES_AUTO_RELOAD'] = value + + templates_auto_reload = property( + _get_templates_auto_reload, _set_templates_auto_reload + ) + del _get_templates_auto_reload, _set_templates_auto_reload + + def create_jinja_environment(self): + """Creates the Jinja2 environment based on :attr:`jinja_options` + and :meth:`select_jinja_autoescape`. Since 0.7 this also adds + the Jinja2 globals and filters after initialization. Override + this function to customize the behavior. + + .. versionadded:: 0.5 + .. versionchanged:: 0.11 + ``Environment.auto_reload`` set in accordance with + ``TEMPLATES_AUTO_RELOAD`` configuration option. + """ + options = dict(self.jinja_options) + + if 'autoescape' not in options: + options['autoescape'] = self.select_jinja_autoescape + + if 'auto_reload' not in options: + options['auto_reload'] = self.templates_auto_reload + + rv = self.jinja_environment(self, **options) + rv.globals.update( + url_for=url_for, + get_flashed_messages=get_flashed_messages, + config=self.config, + # request, session and g are normally added with the + # context processor for efficiency reasons but for imported + # templates we also want the proxies in there. + request=request, + session=session, + g=g + ) + rv.filters['tojson'] = json.tojson_filter + return rv + + def create_global_jinja_loader(self): + """Creates the loader for the Jinja2 environment. Can be used to + override just the loader and keeping the rest unchanged. It's + discouraged to override this function. Instead one should override + the :meth:`jinja_loader` function instead. + + The global loader dispatches between the loaders of the application + and the individual blueprints. + + .. versionadded:: 0.7 + """ + return DispatchingJinjaLoader(self) + + def select_jinja_autoescape(self, filename): + """Returns ``True`` if autoescaping should be active for the given + template name. If no template name is given, returns `True`. + + .. versionadded:: 0.5 + """ + if filename is None: + return True + return filename.endswith(('.html', '.htm', '.xml', '.xhtml')) + + def update_template_context(self, context): + """Update the template context with some commonly used variables. + This injects request, session, config and g into the template + context as well as everything template context processors want + to inject. Note that the as of Flask 0.6, the original values + in the context will not be overridden if a context processor + decides to return a value with the same key. + + :param context: the context as a dictionary that is updated in place + to add extra variables. + """ + funcs = self.template_context_processors[None] + reqctx = _request_ctx_stack.top + if reqctx is not None: + bp = reqctx.request.blueprint + if bp is not None and bp in self.template_context_processors: + funcs = chain(funcs, self.template_context_processors[bp]) + orig_ctx = context.copy() + for func in funcs: + context.update(func()) + # make sure the original values win. This makes it possible to + # easier add new variables in context processors without breaking + # existing views. + context.update(orig_ctx) + + def make_shell_context(self): + """Returns the shell context for an interactive shell for this + application. This runs all the registered shell context + processors. + + .. versionadded:: 0.11 + """ + rv = {'app': self, 'g': g} + for processor in self.shell_context_processors: + rv.update(processor()) + return rv + + #: What environment the app is running in. Flask and extensions may + #: enable behaviors based on the environment, such as enabling debug + #: mode. This maps to the :data:`ENV` config key. This is set by the + #: :envvar:`FLASK_ENV` environment variable and may not behave as + #: expected if set in code. + #: + #: **Do not enable development when deploying in production.** + #: + #: Default: ``'production'`` + env = ConfigAttribute('ENV') + + def _get_debug(self): + return self.config['DEBUG'] + + def _set_debug(self, value): + self.config['DEBUG'] = value + self.jinja_env.auto_reload = self.templates_auto_reload + + #: Whether debug mode is enabled. When using ``flask run`` to start + #: the development server, an interactive debugger will be shown for + #: unhandled exceptions, and the server will be reloaded when code + #: changes. This maps to the :data:`DEBUG` config key. This is + #: enabled when :attr:`env` is ``'development'`` and is overridden + #: by the ``FLASK_DEBUG`` environment variable. It may not behave as + #: expected if set in code. + #: + #: **Do not enable debug mode when deploying in production.** + #: + #: Default: ``True`` if :attr:`env` is ``'development'``, or + #: ``False`` otherwise. + debug = property(_get_debug, _set_debug) + del _get_debug, _set_debug + + def run(self, host=None, port=None, debug=None, + load_dotenv=True, **options): + """Runs the application on a local development server. + + Do not use ``run()`` in a production setting. It is not intended to + meet security and performance requirements for a production server. + Instead, see :ref:`deployment` for WSGI server recommendations. + + If the :attr:`debug` flag is set the server will automatically reload + for code changes and show a debugger in case an exception happened. + + If you want to run the application in debug mode, but disable the + code execution on the interactive debugger, you can pass + ``use_evalex=False`` as parameter. This will keep the debugger's + traceback screen active, but disable code execution. + + It is not recommended to use this function for development with + automatic reloading as this is badly supported. Instead you should + be using the :command:`flask` command line script's ``run`` support. + + .. admonition:: Keep in Mind + + Flask will suppress any server error with a generic error page + unless it is in debug mode. As such to enable just the + interactive debugger without the code reloading, you have to + invoke :meth:`run` with ``debug=True`` and ``use_reloader=False``. + Setting ``use_debugger`` to ``True`` without being in debug mode + won't catch any exceptions because there won't be any to + catch. + + :param host: the hostname to listen on. Set this to ``'0.0.0.0'`` to + have the server available externally as well. Defaults to + ``'127.0.0.1'`` or the host in the ``SERVER_NAME`` config variable + if present. + :param port: the port of the webserver. Defaults to ``5000`` or the + port defined in the ``SERVER_NAME`` config variable if present. + :param debug: if given, enable or disable debug mode. See + :attr:`debug`. + :param load_dotenv: Load the nearest :file:`.env` and :file:`.flaskenv` + files to set environment variables. Will also change the working + directory to the directory containing the first file found. + :param options: the options to be forwarded to the underlying Werkzeug + server. See :func:`werkzeug.serving.run_simple` for more + information. + + .. versionchanged:: 1.0 + If installed, python-dotenv will be used to load environment + variables from :file:`.env` and :file:`.flaskenv` files. + + If set, the :envvar:`FLASK_ENV` and :envvar:`FLASK_DEBUG` + environment variables will override :attr:`env` and + :attr:`debug`. + + Threaded mode is enabled by default. + + .. versionchanged:: 0.10 + The default port is now picked from the ``SERVER_NAME`` + variable. + """ + # Change this into a no-op if the server is invoked from the + # command line. Have a look at cli.py for more information. + if os.environ.get('FLASK_RUN_FROM_CLI') == 'true': + from .debughelpers import explain_ignored_app_run + explain_ignored_app_run() + return + + if get_load_dotenv(load_dotenv): + cli.load_dotenv() + + # if set, let env vars override previous values + if 'FLASK_ENV' in os.environ: + self.env = get_env() + self.debug = get_debug_flag() + elif 'FLASK_DEBUG' in os.environ: + self.debug = get_debug_flag() + + # debug passed to method overrides all other sources + if debug is not None: + self.debug = bool(debug) + + _host = '127.0.0.1' + _port = 5000 + server_name = self.config.get('SERVER_NAME') + sn_host, sn_port = None, None + + if server_name: + sn_host, _, sn_port = server_name.partition(':') + + host = host or sn_host or _host + port = int(port or sn_port or _port) + + options.setdefault('use_reloader', self.debug) + options.setdefault('use_debugger', self.debug) + options.setdefault('threaded', True) + + cli.show_server_banner(self.env, self.debug, self.name, False) + + from werkzeug.serving import run_simple + + try: + run_simple(host, port, self, **options) + finally: + # reset the first request information if the development server + # reset normally. This makes it possible to restart the server + # without reloader and that stuff from an interactive shell. + self._got_first_request = False + + def test_client(self, use_cookies=True, **kwargs): + """Creates a test client for this application. For information + about unit testing head over to :ref:`testing`. + + Note that if you are testing for assertions or exceptions in your + application code, you must set ``app.testing = True`` in order for the + exceptions to propagate to the test client. Otherwise, the exception + will be handled by the application (not visible to the test client) and + the only indication of an AssertionError or other exception will be a + 500 status code response to the test client. See the :attr:`testing` + attribute. For example:: + + app.testing = True + client = app.test_client() + + The test client can be used in a ``with`` block to defer the closing down + of the context until the end of the ``with`` block. This is useful if + you want to access the context locals for testing:: + + with app.test_client() as c: + rv = c.get('/?vodka=42') + assert request.args['vodka'] == '42' + + Additionally, you may pass optional keyword arguments that will then + be passed to the application's :attr:`test_client_class` constructor. + For example:: + + from flask.testing import FlaskClient + + class CustomClient(FlaskClient): + def __init__(self, *args, **kwargs): + self._authentication = kwargs.pop("authentication") + super(CustomClient,self).__init__( *args, **kwargs) + + app.test_client_class = CustomClient + client = app.test_client(authentication='Basic ....') + + See :class:`~flask.testing.FlaskClient` for more information. + + .. versionchanged:: 0.4 + added support for ``with`` block usage for the client. + + .. versionadded:: 0.7 + The `use_cookies` parameter was added as well as the ability + to override the client to be used by setting the + :attr:`test_client_class` attribute. + + .. versionchanged:: 0.11 + Added `**kwargs` to support passing additional keyword arguments to + the constructor of :attr:`test_client_class`. + """ + cls = self.test_client_class + if cls is None: + from flask.testing import FlaskClient as cls + return cls(self, self.response_class, use_cookies=use_cookies, **kwargs) + + def test_cli_runner(self, **kwargs): + """Create a CLI runner for testing CLI commands. + See :ref:`testing-cli`. + + Returns an instance of :attr:`test_cli_runner_class`, by default + :class:`~flask.testing.FlaskCliRunner`. The Flask app object is + passed as the first argument. + + .. versionadded:: 1.0 + """ + cls = self.test_cli_runner_class + + if cls is None: + from flask.testing import FlaskCliRunner as cls + + return cls(self, **kwargs) + + def open_session(self, request): + """Creates or opens a new session. Default implementation stores all + session data in a signed cookie. This requires that the + :attr:`secret_key` is set. Instead of overriding this method + we recommend replacing the :class:`session_interface`. + + .. deprecated: 1.0 + Will be removed in 1.1. Use ``session_interface.open_session`` + instead. + + :param request: an instance of :attr:`request_class`. + """ + + warnings.warn(DeprecationWarning( + '"open_session" is deprecated and will be removed in 1.1. Use' + ' "session_interface.open_session" instead.' + )) + return self.session_interface.open_session(self, request) + + def save_session(self, session, response): + """Saves the session if it needs updates. For the default + implementation, check :meth:`open_session`. Instead of overriding this + method we recommend replacing the :class:`session_interface`. + + .. deprecated: 1.0 + Will be removed in 1.1. Use ``session_interface.save_session`` + instead. + + :param session: the session to be saved (a + :class:`~werkzeug.contrib.securecookie.SecureCookie` + object) + :param response: an instance of :attr:`response_class` + """ + + warnings.warn(DeprecationWarning( + '"save_session" is deprecated and will be removed in 1.1. Use' + ' "session_interface.save_session" instead.' + )) + return self.session_interface.save_session(self, session, response) + + def make_null_session(self): + """Creates a new instance of a missing session. Instead of overriding + this method we recommend replacing the :class:`session_interface`. + + .. deprecated: 1.0 + Will be removed in 1.1. Use ``session_interface.make_null_session`` + instead. + + .. versionadded:: 0.7 + """ + + warnings.warn(DeprecationWarning( + '"make_null_session" is deprecated and will be removed in 1.1. Use' + ' "session_interface.make_null_session" instead.' + )) + return self.session_interface.make_null_session(self) + + @setupmethod + def register_blueprint(self, blueprint, **options): + """Register a :class:`~flask.Blueprint` on the application. Keyword + arguments passed to this method will override the defaults set on the + blueprint. + + Calls the blueprint's :meth:`~flask.Blueprint.register` method after + recording the blueprint in the application's :attr:`blueprints`. + + :param blueprint: The blueprint to register. + :param url_prefix: Blueprint routes will be prefixed with this. + :param subdomain: Blueprint routes will match on this subdomain. + :param url_defaults: Blueprint routes will use these default values for + view arguments. + :param options: Additional keyword arguments are passed to + :class:`~flask.blueprints.BlueprintSetupState`. They can be + accessed in :meth:`~flask.Blueprint.record` callbacks. + + .. versionadded:: 0.7 + """ + first_registration = False + + if blueprint.name in self.blueprints: + assert self.blueprints[blueprint.name] is blueprint, ( + 'A name collision occurred between blueprints %r and %r. Both' + ' share the same name "%s". Blueprints that are created on the' + ' fly need unique names.' % ( + blueprint, self.blueprints[blueprint.name], blueprint.name + ) + ) + else: + self.blueprints[blueprint.name] = blueprint + self._blueprint_order.append(blueprint) + first_registration = True + + blueprint.register(self, options, first_registration) + + def iter_blueprints(self): + """Iterates over all blueprints by the order they were registered. + + .. versionadded:: 0.11 + """ + return iter(self._blueprint_order) + + @setupmethod + def add_url_rule(self, rule, endpoint=None, view_func=None, + provide_automatic_options=None, **options): + """Connects a URL rule. Works exactly like the :meth:`route` + decorator. If a view_func is provided it will be registered with the + endpoint. + + Basically this example:: + + @app.route('/') + def index(): + pass + + Is equivalent to the following:: + + def index(): + pass + app.add_url_rule('/', 'index', index) + + If the view_func is not provided you will need to connect the endpoint + to a view function like so:: + + app.view_functions['index'] = index + + Internally :meth:`route` invokes :meth:`add_url_rule` so if you want + to customize the behavior via subclassing you only need to change + this method. + + For more information refer to :ref:`url-route-registrations`. + + .. versionchanged:: 0.2 + `view_func` parameter added. + + .. versionchanged:: 0.6 + ``OPTIONS`` is added automatically as method. + + :param rule: the URL rule as string + :param endpoint: the endpoint for the registered URL rule. Flask + itself assumes the name of the view function as + endpoint + :param view_func: the function to call when serving a request to the + provided endpoint + :param provide_automatic_options: controls whether the ``OPTIONS`` + method should be added automatically. This can also be controlled + by setting the ``view_func.provide_automatic_options = False`` + before adding the rule. + :param options: the options to be forwarded to the underlying + :class:`~werkzeug.routing.Rule` object. A change + to Werkzeug is handling of method options. methods + is a list of methods this rule should be limited + to (``GET``, ``POST`` etc.). By default a rule + just listens for ``GET`` (and implicitly ``HEAD``). + Starting with Flask 0.6, ``OPTIONS`` is implicitly + added and handled by the standard request handling. + """ + if endpoint is None: + endpoint = _endpoint_from_view_func(view_func) + options['endpoint'] = endpoint + methods = options.pop('methods', None) + + # if the methods are not given and the view_func object knows its + # methods we can use that instead. If neither exists, we go with + # a tuple of only ``GET`` as default. + if methods is None: + methods = getattr(view_func, 'methods', None) or ('GET',) + if isinstance(methods, string_types): + raise TypeError('Allowed methods have to be iterables of strings, ' + 'for example: @app.route(..., methods=["POST"])') + methods = set(item.upper() for item in methods) + + # Methods that should always be added + required_methods = set(getattr(view_func, 'required_methods', ())) + + # starting with Flask 0.8 the view_func object can disable and + # force-enable the automatic options handling. + if provide_automatic_options is None: + provide_automatic_options = getattr(view_func, + 'provide_automatic_options', None) + + if provide_automatic_options is None: + if 'OPTIONS' not in methods: + provide_automatic_options = True + required_methods.add('OPTIONS') + else: + provide_automatic_options = False + + # Add the required methods now. + methods |= required_methods + + rule = self.url_rule_class(rule, methods=methods, **options) + rule.provide_automatic_options = provide_automatic_options + + self.url_map.add(rule) + if view_func is not None: + old_func = self.view_functions.get(endpoint) + if old_func is not None and old_func != view_func: + raise AssertionError('View function mapping is overwriting an ' + 'existing endpoint function: %s' % endpoint) + self.view_functions[endpoint] = view_func + + def route(self, rule, **options): + """A decorator that is used to register a view function for a + given URL rule. This does the same thing as :meth:`add_url_rule` + but is intended for decorator usage:: + + @app.route('/') + def index(): + return 'Hello World' + + For more information refer to :ref:`url-route-registrations`. + + :param rule: the URL rule as string + :param endpoint: the endpoint for the registered URL rule. Flask + itself assumes the name of the view function as + endpoint + :param options: the options to be forwarded to the underlying + :class:`~werkzeug.routing.Rule` object. A change + to Werkzeug is handling of method options. methods + is a list of methods this rule should be limited + to (``GET``, ``POST`` etc.). By default a rule + just listens for ``GET`` (and implicitly ``HEAD``). + Starting with Flask 0.6, ``OPTIONS`` is implicitly + added and handled by the standard request handling. + """ + def decorator(f): + endpoint = options.pop('endpoint', None) + self.add_url_rule(rule, endpoint, f, **options) + return f + return decorator + + @setupmethod + def endpoint(self, endpoint): + """A decorator to register a function as an endpoint. + Example:: + + @app.endpoint('example.endpoint') + def example(): + return "example" + + :param endpoint: the name of the endpoint + """ + def decorator(f): + self.view_functions[endpoint] = f + return f + return decorator + + @staticmethod + def _get_exc_class_and_code(exc_class_or_code): + """Ensure that we register only exceptions as handler keys""" + if isinstance(exc_class_or_code, integer_types): + exc_class = default_exceptions[exc_class_or_code] + else: + exc_class = exc_class_or_code + + assert issubclass(exc_class, Exception) + + if issubclass(exc_class, HTTPException): + return exc_class, exc_class.code + else: + return exc_class, None + + @setupmethod + def errorhandler(self, code_or_exception): + """Register a function to handle errors by code or exception class. + + A decorator that is used to register a function given an + error code. Example:: + + @app.errorhandler(404) + def page_not_found(error): + return 'This page does not exist', 404 + + You can also register handlers for arbitrary exceptions:: + + @app.errorhandler(DatabaseError) + def special_exception_handler(error): + return 'Database connection failed', 500 + + .. versionadded:: 0.7 + Use :meth:`register_error_handler` instead of modifying + :attr:`error_handler_spec` directly, for application wide error + handlers. + + .. versionadded:: 0.7 + One can now additionally also register custom exception types + that do not necessarily have to be a subclass of the + :class:`~werkzeug.exceptions.HTTPException` class. + + :param code_or_exception: the code as integer for the handler, or + an arbitrary exception + """ + def decorator(f): + self._register_error_handler(None, code_or_exception, f) + return f + return decorator + + @setupmethod + def register_error_handler(self, code_or_exception, f): + """Alternative error attach function to the :meth:`errorhandler` + decorator that is more straightforward to use for non decorator + usage. + + .. versionadded:: 0.7 + """ + self._register_error_handler(None, code_or_exception, f) + + @setupmethod + def _register_error_handler(self, key, code_or_exception, f): + """ + :type key: None|str + :type code_or_exception: int|T<=Exception + :type f: callable + """ + if isinstance(code_or_exception, HTTPException): # old broken behavior + raise ValueError( + 'Tried to register a handler for an exception instance {0!r}.' + ' Handlers can only be registered for exception classes or' + ' HTTP error codes.'.format(code_or_exception) + ) + + try: + exc_class, code = self._get_exc_class_and_code(code_or_exception) + except KeyError: + raise KeyError( + "'{0}' is not a recognized HTTP error code. Use a subclass of" + " HTTPException with that code instead.".format(code_or_exception) + ) + + handlers = self.error_handler_spec.setdefault(key, {}).setdefault(code, {}) + handlers[exc_class] = f + + @setupmethod + def template_filter(self, name=None): + """A decorator that is used to register custom template filter. + You can specify a name for the filter, otherwise the function + name will be used. Example:: + + @app.template_filter() + def reverse(s): + return s[::-1] + + :param name: the optional name of the filter, otherwise the + function name will be used. + """ + def decorator(f): + self.add_template_filter(f, name=name) + return f + return decorator + + @setupmethod + def add_template_filter(self, f, name=None): + """Register a custom template filter. Works exactly like the + :meth:`template_filter` decorator. + + :param name: the optional name of the filter, otherwise the + function name will be used. + """ + self.jinja_env.filters[name or f.__name__] = f + + @setupmethod + def template_test(self, name=None): + """A decorator that is used to register custom template test. + You can specify a name for the test, otherwise the function + name will be used. Example:: + + @app.template_test() + def is_prime(n): + if n == 2: + return True + for i in range(2, int(math.ceil(math.sqrt(n))) + 1): + if n % i == 0: + return False + return True + + .. versionadded:: 0.10 + + :param name: the optional name of the test, otherwise the + function name will be used. + """ + def decorator(f): + self.add_template_test(f, name=name) + return f + return decorator + + @setupmethod + def add_template_test(self, f, name=None): + """Register a custom template test. Works exactly like the + :meth:`template_test` decorator. + + .. versionadded:: 0.10 + + :param name: the optional name of the test, otherwise the + function name will be used. + """ + self.jinja_env.tests[name or f.__name__] = f + + @setupmethod + def template_global(self, name=None): + """A decorator that is used to register a custom template global function. + You can specify a name for the global function, otherwise the function + name will be used. Example:: + + @app.template_global() + def double(n): + return 2 * n + + .. versionadded:: 0.10 + + :param name: the optional name of the global function, otherwise the + function name will be used. + """ + def decorator(f): + self.add_template_global(f, name=name) + return f + return decorator + + @setupmethod + def add_template_global(self, f, name=None): + """Register a custom template global function. Works exactly like the + :meth:`template_global` decorator. + + .. versionadded:: 0.10 + + :param name: the optional name of the global function, otherwise the + function name will be used. + """ + self.jinja_env.globals[name or f.__name__] = f + + @setupmethod + def before_request(self, f): + """Registers a function to run before each request. + + For example, this can be used to open a database connection, or to load + the logged in user from the session. + + The function will be called without any arguments. If it returns a + non-None value, the value is handled as if it was the return value from + the view, and further request handling is stopped. + """ + self.before_request_funcs.setdefault(None, []).append(f) + return f + + @setupmethod + def before_first_request(self, f): + """Registers a function to be run before the first request to this + instance of the application. + + The function will be called without any arguments and its return + value is ignored. + + .. versionadded:: 0.8 + """ + self.before_first_request_funcs.append(f) + return f + + @setupmethod + def after_request(self, f): + """Register a function to be run after each request. + + Your function must take one parameter, an instance of + :attr:`response_class` and return a new response object or the + same (see :meth:`process_response`). + + As of Flask 0.7 this function might not be executed at the end of the + request in case an unhandled exception occurred. + """ + self.after_request_funcs.setdefault(None, []).append(f) + return f + + @setupmethod + def teardown_request(self, f): + """Register a function to be run at the end of each request, + regardless of whether there was an exception or not. These functions + are executed when the request context is popped, even if not an + actual request was performed. + + Example:: + + ctx = app.test_request_context() + ctx.push() + ... + ctx.pop() + + When ``ctx.pop()`` is executed in the above example, the teardown + functions are called just before the request context moves from the + stack of active contexts. This becomes relevant if you are using + such constructs in tests. + + Generally teardown functions must take every necessary step to avoid + that they will fail. If they do execute code that might fail they + will have to surround the execution of these code by try/except + statements and log occurring errors. + + When a teardown function was called because of an exception it will + be passed an error object. + + The return values of teardown functions are ignored. + + .. admonition:: Debug Note + + In debug mode Flask will not tear down a request on an exception + immediately. Instead it will keep it alive so that the interactive + debugger can still access it. This behavior can be controlled + by the ``PRESERVE_CONTEXT_ON_EXCEPTION`` configuration variable. + """ + self.teardown_request_funcs.setdefault(None, []).append(f) + return f + + @setupmethod + def teardown_appcontext(self, f): + """Registers a function to be called when the application context + ends. These functions are typically also called when the request + context is popped. + + Example:: + + ctx = app.app_context() + ctx.push() + ... + ctx.pop() + + When ``ctx.pop()`` is executed in the above example, the teardown + functions are called just before the app context moves from the + stack of active contexts. This becomes relevant if you are using + such constructs in tests. + + Since a request context typically also manages an application + context it would also be called when you pop a request context. + + When a teardown function was called because of an unhandled exception + it will be passed an error object. If an :meth:`errorhandler` is + registered, it will handle the exception and the teardown will not + receive it. + + The return values of teardown functions are ignored. + + .. versionadded:: 0.9 + """ + self.teardown_appcontext_funcs.append(f) + return f + + @setupmethod + def context_processor(self, f): + """Registers a template context processor function.""" + self.template_context_processors[None].append(f) + return f + + @setupmethod + def shell_context_processor(self, f): + """Registers a shell context processor function. + + .. versionadded:: 0.11 + """ + self.shell_context_processors.append(f) + return f + + @setupmethod + def url_value_preprocessor(self, f): + """Register a URL value preprocessor function for all view + functions in the application. These functions will be called before the + :meth:`before_request` functions. + + The function can modify the values captured from the matched url before + they are passed to the view. For example, this can be used to pop a + common language code value and place it in ``g`` rather than pass it to + every view. + + The function is passed the endpoint name and values dict. The return + value is ignored. + """ + self.url_value_preprocessors.setdefault(None, []).append(f) + return f + + @setupmethod + def url_defaults(self, f): + """Callback function for URL defaults for all view functions of the + application. It's called with the endpoint and values and should + update the values passed in place. + """ + self.url_default_functions.setdefault(None, []).append(f) + return f + + def _find_error_handler(self, e): + """Return a registered error handler for an exception in this order: + blueprint handler for a specific code, app handler for a specific code, + blueprint handler for an exception class, app handler for an exception + class, or ``None`` if a suitable handler is not found. + """ + exc_class, code = self._get_exc_class_and_code(type(e)) + + for name, c in ( + (request.blueprint, code), (None, code), + (request.blueprint, None), (None, None) + ): + handler_map = self.error_handler_spec.setdefault(name, {}).get(c) + + if not handler_map: + continue + + for cls in exc_class.__mro__: + handler = handler_map.get(cls) + + if handler is not None: + return handler + + def handle_http_exception(self, e): + """Handles an HTTP exception. By default this will invoke the + registered error handlers and fall back to returning the + exception as response. + + .. versionchanged:: 1.0.3 + ``RoutingException``, used internally for actions such as + slash redirects during routing, is not passed to error + handlers. + + .. versionchanged:: 1.0 + Exceptions are looked up by code *and* by MRO, so + ``HTTPExcpetion`` subclasses can be handled with a catch-all + handler for the base ``HTTPException``. + + .. versionadded:: 0.3 + """ + # Proxy exceptions don't have error codes. We want to always return + # those unchanged as errors + if e.code is None: + return e + + # RoutingExceptions are used internally to trigger routing + # actions, such as slash redirects raising RequestRedirect. They + # are not raised or handled in user code. + if isinstance(e, RoutingException): + return e + + handler = self._find_error_handler(e) + if handler is None: + return e + return handler(e) + + def trap_http_exception(self, e): + """Checks if an HTTP exception should be trapped or not. By default + this will return ``False`` for all exceptions except for a bad request + key error if ``TRAP_BAD_REQUEST_ERRORS`` is set to ``True``. It + also returns ``True`` if ``TRAP_HTTP_EXCEPTIONS`` is set to ``True``. + + This is called for all HTTP exceptions raised by a view function. + If it returns ``True`` for any exception the error handler for this + exception is not called and it shows up as regular exception in the + traceback. This is helpful for debugging implicitly raised HTTP + exceptions. + + .. versionchanged:: 1.0 + Bad request errors are not trapped by default in debug mode. + + .. versionadded:: 0.8 + """ + if self.config['TRAP_HTTP_EXCEPTIONS']: + return True + + trap_bad_request = self.config['TRAP_BAD_REQUEST_ERRORS'] + + # if unset, trap key errors in debug mode + if ( + trap_bad_request is None and self.debug + and isinstance(e, BadRequestKeyError) + ): + return True + + if trap_bad_request: + return isinstance(e, BadRequest) + + return False + + def handle_user_exception(self, e): + """This method is called whenever an exception occurs that + should be handled. A special case is :class:`~werkzeug + .exceptions.HTTPException` which is forwarded to the + :meth:`handle_http_exception` method. This function will either + return a response value or reraise the exception with the same + traceback. + + .. versionchanged:: 1.0 + Key errors raised from request data like ``form`` show the + bad key in debug mode rather than a generic bad request + message. + + .. versionadded:: 0.7 + """ + exc_type, exc_value, tb = sys.exc_info() + assert exc_value is e + # ensure not to trash sys.exc_info() at that point in case someone + # wants the traceback preserved in handle_http_exception. Of course + # we cannot prevent users from trashing it themselves in a custom + # trap_http_exception method so that's their fault then. + + if isinstance(e, BadRequestKeyError): + if self.debug or self.config["TRAP_BAD_REQUEST_ERRORS"]: + # Werkzeug < 0.15 doesn't add the KeyError to the 400 + # message, add it in manually. + description = e.get_description() + + if e.args[0] not in description: + e.description = "KeyError: '{}'".format(*e.args) + else: + # Werkzeug >= 0.15 does add it, remove it in production + e.args = () + + if isinstance(e, HTTPException) and not self.trap_http_exception(e): + return self.handle_http_exception(e) + + handler = self._find_error_handler(e) + + if handler is None: + reraise(exc_type, exc_value, tb) + return handler(e) + + def handle_exception(self, e): + """Default exception handling that kicks in when an exception + occurs that is not caught. In debug mode the exception will + be re-raised immediately, otherwise it is logged and the handler + for a 500 internal server error is used. If no such handler + exists, a default 500 internal server error message is displayed. + + .. versionadded:: 0.3 + """ + exc_type, exc_value, tb = sys.exc_info() + + got_request_exception.send(self, exception=e) + handler = self._find_error_handler(InternalServerError()) + + if self.propagate_exceptions: + # if we want to repropagate the exception, we can attempt to + # raise it with the whole traceback in case we can do that + # (the function was actually called from the except part) + # otherwise, we just raise the error again + if exc_value is e: + reraise(exc_type, exc_value, tb) + else: + raise e + + self.log_exception((exc_type, exc_value, tb)) + if handler is None: + return InternalServerError() + return self.finalize_request(handler(e), from_error_handler=True) + + def log_exception(self, exc_info): + """Logs an exception. This is called by :meth:`handle_exception` + if debugging is disabled and right before the handler is called. + The default implementation logs the exception as error on the + :attr:`logger`. + + .. versionadded:: 0.8 + """ + self.logger.error('Exception on %s [%s]' % ( + request.path, + request.method + ), exc_info=exc_info) + + def raise_routing_exception(self, request): + """Exceptions that are recording during routing are reraised with + this method. During debug we are not reraising redirect requests + for non ``GET``, ``HEAD``, or ``OPTIONS`` requests and we're raising + a different error instead to help debug situations. + + :internal: + """ + if not self.debug \ + or not isinstance(request.routing_exception, RequestRedirect) \ + or request.method in ('GET', 'HEAD', 'OPTIONS'): + raise request.routing_exception + + from .debughelpers import FormDataRoutingRedirect + raise FormDataRoutingRedirect(request) + + def dispatch_request(self): + """Does the request dispatching. Matches the URL and returns the + return value of the view or error handler. This does not have to + be a response object. In order to convert the return value to a + proper response object, call :func:`make_response`. + + .. versionchanged:: 0.7 + This no longer does the exception handling, this code was + moved to the new :meth:`full_dispatch_request`. + """ + req = _request_ctx_stack.top.request + if req.routing_exception is not None: + self.raise_routing_exception(req) + rule = req.url_rule + # if we provide automatic options for this URL and the + # request came with the OPTIONS method, reply automatically + if getattr(rule, 'provide_automatic_options', False) \ + and req.method == 'OPTIONS': + return self.make_default_options_response() + # otherwise dispatch to the handler for that endpoint + return self.view_functions[rule.endpoint](**req.view_args) + + def full_dispatch_request(self): + """Dispatches the request and on top of that performs request + pre and postprocessing as well as HTTP exception catching and + error handling. + + .. versionadded:: 0.7 + """ + self.try_trigger_before_first_request_functions() + try: + request_started.send(self) + rv = self.preprocess_request() + if rv is None: + rv = self.dispatch_request() + except Exception as e: + rv = self.handle_user_exception(e) + return self.finalize_request(rv) + + def finalize_request(self, rv, from_error_handler=False): + """Given the return value from a view function this finalizes + the request by converting it into a response and invoking the + postprocessing functions. This is invoked for both normal + request dispatching as well as error handlers. + + Because this means that it might be called as a result of a + failure a special safe mode is available which can be enabled + with the `from_error_handler` flag. If enabled, failures in + response processing will be logged and otherwise ignored. + + :internal: + """ + response = self.make_response(rv) + try: + response = self.process_response(response) + request_finished.send(self, response=response) + except Exception: + if not from_error_handler: + raise + self.logger.exception('Request finalizing failed with an ' + 'error while handling an error') + return response + + def try_trigger_before_first_request_functions(self): + """Called before each request and will ensure that it triggers + the :attr:`before_first_request_funcs` and only exactly once per + application instance (which means process usually). + + :internal: + """ + if self._got_first_request: + return + with self._before_request_lock: + if self._got_first_request: + return + for func in self.before_first_request_funcs: + func() + self._got_first_request = True + + def make_default_options_response(self): + """This method is called to create the default ``OPTIONS`` response. + This can be changed through subclassing to change the default + behavior of ``OPTIONS`` responses. + + .. versionadded:: 0.7 + """ + adapter = _request_ctx_stack.top.url_adapter + if hasattr(adapter, 'allowed_methods'): + methods = adapter.allowed_methods() + else: + # fallback for Werkzeug < 0.7 + methods = [] + try: + adapter.match(method='--') + except MethodNotAllowed as e: + methods = e.valid_methods + except HTTPException as e: + pass + rv = self.response_class() + rv.allow.update(methods) + return rv + + def should_ignore_error(self, error): + """This is called to figure out if an error should be ignored + or not as far as the teardown system is concerned. If this + function returns ``True`` then the teardown handlers will not be + passed the error. + + .. versionadded:: 0.10 + """ + return False + + def make_response(self, rv): + """Convert the return value from a view function to an instance of + :attr:`response_class`. + + :param rv: the return value from the view function. The view function + must return a response. Returning ``None``, or the view ending + without returning, is not allowed. The following types are allowed + for ``view_rv``: + + ``str`` (``unicode`` in Python 2) + A response object is created with the string encoded to UTF-8 + as the body. + + ``bytes`` (``str`` in Python 2) + A response object is created with the bytes as the body. + + ``tuple`` + Either ``(body, status, headers)``, ``(body, status)``, or + ``(body, headers)``, where ``body`` is any of the other types + allowed here, ``status`` is a string or an integer, and + ``headers`` is a dictionary or a list of ``(key, value)`` + tuples. If ``body`` is a :attr:`response_class` instance, + ``status`` overwrites the exiting value and ``headers`` are + extended. + + :attr:`response_class` + The object is returned unchanged. + + other :class:`~werkzeug.wrappers.Response` class + The object is coerced to :attr:`response_class`. + + :func:`callable` + The function is called as a WSGI application. The result is + used to create a response object. + + .. versionchanged:: 0.9 + Previously a tuple was interpreted as the arguments for the + response object. + """ + + status = headers = None + + # unpack tuple returns + if isinstance(rv, tuple): + len_rv = len(rv) + + # a 3-tuple is unpacked directly + if len_rv == 3: + rv, status, headers = rv + # decide if a 2-tuple has status or headers + elif len_rv == 2: + if isinstance(rv[1], (Headers, dict, tuple, list)): + rv, headers = rv + else: + rv, status = rv + # other sized tuples are not allowed + else: + raise TypeError( + 'The view function did not return a valid response tuple.' + ' The tuple must have the form (body, status, headers),' + ' (body, status), or (body, headers).' + ) + + # the body must not be None + if rv is None: + raise TypeError( + 'The view function did not return a valid response. The' + ' function either returned None or ended without a return' + ' statement.' + ) + + # make sure the body is an instance of the response class + if not isinstance(rv, self.response_class): + if isinstance(rv, (text_type, bytes, bytearray)): + # let the response class set the status and headers instead of + # waiting to do it manually, so that the class can handle any + # special logic + rv = self.response_class(rv, status=status, headers=headers) + status = headers = None + else: + # evaluate a WSGI callable, or coerce a different response + # class to the correct type + try: + rv = self.response_class.force_type(rv, request.environ) + except TypeError as e: + new_error = TypeError( + '{e}\nThe view function did not return a valid' + ' response. The return type must be a string, tuple,' + ' Response instance, or WSGI callable, but it was a' + ' {rv.__class__.__name__}.'.format(e=e, rv=rv) + ) + reraise(TypeError, new_error, sys.exc_info()[2]) + + # prefer the status if it was provided + if status is not None: + if isinstance(status, (text_type, bytes, bytearray)): + rv.status = status + else: + rv.status_code = status + + # extend existing headers with provided headers + if headers: + rv.headers.extend(headers) + + return rv + + def create_url_adapter(self, request): + """Creates a URL adapter for the given request. The URL adapter + is created at a point where the request context is not yet set + up so the request is passed explicitly. + + .. versionadded:: 0.6 + + .. versionchanged:: 0.9 + This can now also be called without a request object when the + URL adapter is created for the application context. + + .. versionchanged:: 1.0 + :data:`SERVER_NAME` no longer implicitly enables subdomain + matching. Use :attr:`subdomain_matching` instead. + """ + if request is not None: + # If subdomain matching is disabled (the default), use the + # default subdomain in all cases. This should be the default + # in Werkzeug but it currently does not have that feature. + subdomain = ((self.url_map.default_subdomain or None) + if not self.subdomain_matching else None) + return self.url_map.bind_to_environ( + request.environ, + server_name=self.config['SERVER_NAME'], + subdomain=subdomain) + # We need at the very least the server name to be set for this + # to work. + if self.config['SERVER_NAME'] is not None: + return self.url_map.bind( + self.config['SERVER_NAME'], + script_name=self.config['APPLICATION_ROOT'], + url_scheme=self.config['PREFERRED_URL_SCHEME']) + + def inject_url_defaults(self, endpoint, values): + """Injects the URL defaults for the given endpoint directly into + the values dictionary passed. This is used internally and + automatically called on URL building. + + .. versionadded:: 0.7 + """ + funcs = self.url_default_functions.get(None, ()) + if '.' in endpoint: + bp = endpoint.rsplit('.', 1)[0] + funcs = chain(funcs, self.url_default_functions.get(bp, ())) + for func in funcs: + func(endpoint, values) + + def handle_url_build_error(self, error, endpoint, values): + """Handle :class:`~werkzeug.routing.BuildError` on :meth:`url_for`. + """ + exc_type, exc_value, tb = sys.exc_info() + for handler in self.url_build_error_handlers: + try: + rv = handler(error, endpoint, values) + if rv is not None: + return rv + except BuildError as e: + # make error available outside except block (py3) + error = e + + # At this point we want to reraise the exception. If the error is + # still the same one we can reraise it with the original traceback, + # otherwise we raise it from here. + if error is exc_value: + reraise(exc_type, exc_value, tb) + raise error + + def preprocess_request(self): + """Called before the request is dispatched. Calls + :attr:`url_value_preprocessors` registered with the app and the + current blueprint (if any). Then calls :attr:`before_request_funcs` + registered with the app and the blueprint. + + If any :meth:`before_request` handler returns a non-None value, the + value is handled as if it was the return value from the view, and + further request handling is stopped. + """ + + bp = _request_ctx_stack.top.request.blueprint + + funcs = self.url_value_preprocessors.get(None, ()) + if bp is not None and bp in self.url_value_preprocessors: + funcs = chain(funcs, self.url_value_preprocessors[bp]) + for func in funcs: + func(request.endpoint, request.view_args) + + funcs = self.before_request_funcs.get(None, ()) + if bp is not None and bp in self.before_request_funcs: + funcs = chain(funcs, self.before_request_funcs[bp]) + for func in funcs: + rv = func() + if rv is not None: + return rv + + def process_response(self, response): + """Can be overridden in order to modify the response object + before it's sent to the WSGI server. By default this will + call all the :meth:`after_request` decorated functions. + + .. versionchanged:: 0.5 + As of Flask 0.5 the functions registered for after request + execution are called in reverse order of registration. + + :param response: a :attr:`response_class` object. + :return: a new response object or the same, has to be an + instance of :attr:`response_class`. + """ + ctx = _request_ctx_stack.top + bp = ctx.request.blueprint + funcs = ctx._after_request_functions + if bp is not None and bp in self.after_request_funcs: + funcs = chain(funcs, reversed(self.after_request_funcs[bp])) + if None in self.after_request_funcs: + funcs = chain(funcs, reversed(self.after_request_funcs[None])) + for handler in funcs: + response = handler(response) + if not self.session_interface.is_null_session(ctx.session): + self.session_interface.save_session(self, ctx.session, response) + return response + + def do_teardown_request(self, exc=_sentinel): + """Called after the request is dispatched and the response is + returned, right before the request context is popped. + + This calls all functions decorated with + :meth:`teardown_request`, and :meth:`Blueprint.teardown_request` + if a blueprint handled the request. Finally, the + :data:`request_tearing_down` signal is sent. + + This is called by + :meth:`RequestContext.pop() `, + which may be delayed during testing to maintain access to + resources. + + :param exc: An unhandled exception raised while dispatching the + request. Detected from the current exception information if + not passed. Passed to each teardown function. + + .. versionchanged:: 0.9 + Added the ``exc`` argument. + """ + if exc is _sentinel: + exc = sys.exc_info()[1] + funcs = reversed(self.teardown_request_funcs.get(None, ())) + bp = _request_ctx_stack.top.request.blueprint + if bp is not None and bp in self.teardown_request_funcs: + funcs = chain(funcs, reversed(self.teardown_request_funcs[bp])) + for func in funcs: + func(exc) + request_tearing_down.send(self, exc=exc) + + def do_teardown_appcontext(self, exc=_sentinel): + """Called right before the application context is popped. + + When handling a request, the application context is popped + after the request context. See :meth:`do_teardown_request`. + + This calls all functions decorated with + :meth:`teardown_appcontext`. Then the + :data:`appcontext_tearing_down` signal is sent. + + This is called by + :meth:`AppContext.pop() `. + + .. versionadded:: 0.9 + """ + if exc is _sentinel: + exc = sys.exc_info()[1] + for func in reversed(self.teardown_appcontext_funcs): + func(exc) + appcontext_tearing_down.send(self, exc=exc) + + def app_context(self): + """Create an :class:`~flask.ctx.AppContext`. Use as a ``with`` + block to push the context, which will make :data:`current_app` + point at this application. + + An application context is automatically pushed by + :meth:`RequestContext.push() ` + when handling a request, and when running a CLI command. Use + this to manually create a context outside of these situations. + + :: + + with app.app_context(): + init_db() + + See :doc:`/appcontext`. + + .. versionadded:: 0.9 + """ + return AppContext(self) + + def request_context(self, environ): + """Create a :class:`~flask.ctx.RequestContext` representing a + WSGI environment. Use a ``with`` block to push the context, + which will make :data:`request` point at this request. + + See :doc:`/reqcontext`. + + Typically you should not call this from your own code. A request + context is automatically pushed by the :meth:`wsgi_app` when + handling a request. Use :meth:`test_request_context` to create + an environment and context instead of this method. + + :param environ: a WSGI environment + """ + return RequestContext(self, environ) + + def test_request_context(self, *args, **kwargs): + """Create a :class:`~flask.ctx.RequestContext` for a WSGI + environment created from the given values. This is mostly useful + during testing, where you may want to run a function that uses + request data without dispatching a full request. + + See :doc:`/reqcontext`. + + Use a ``with`` block to push the context, which will make + :data:`request` point at the request for the created + environment. :: + + with test_request_context(...): + generate_report() + + When using the shell, it may be easier to push and pop the + context manually to avoid indentation. :: + + ctx = app.test_request_context(...) + ctx.push() + ... + ctx.pop() + + Takes the same arguments as Werkzeug's + :class:`~werkzeug.test.EnvironBuilder`, with some defaults from + the application. See the linked Werkzeug docs for most of the + available arguments. Flask-specific behavior is listed here. + + :param path: URL path being requested. + :param base_url: Base URL where the app is being served, which + ``path`` is relative to. If not given, built from + :data:`PREFERRED_URL_SCHEME`, ``subdomain``, + :data:`SERVER_NAME`, and :data:`APPLICATION_ROOT`. + :param subdomain: Subdomain name to append to + :data:`SERVER_NAME`. + :param url_scheme: Scheme to use instead of + :data:`PREFERRED_URL_SCHEME`. + :param data: The request body, either as a string or a dict of + form keys and values. + :param json: If given, this is serialized as JSON and passed as + ``data``. Also defaults ``content_type`` to + ``application/json``. + :param args: other positional arguments passed to + :class:`~werkzeug.test.EnvironBuilder`. + :param kwargs: other keyword arguments passed to + :class:`~werkzeug.test.EnvironBuilder`. + """ + from flask.testing import make_test_environ_builder + + builder = make_test_environ_builder(self, *args, **kwargs) + + try: + return self.request_context(builder.get_environ()) + finally: + builder.close() + + def wsgi_app(self, environ, start_response): + """The actual WSGI application. This is not implemented in + :meth:`__call__` so that middlewares can be applied without + losing a reference to the app object. Instead of doing this:: + + app = MyMiddleware(app) + + It's a better idea to do this instead:: + + app.wsgi_app = MyMiddleware(app.wsgi_app) + + Then you still have the original application object around and + can continue to call methods on it. + + .. versionchanged:: 0.7 + Teardown events for the request and app contexts are called + even if an unhandled error occurs. Other events may not be + called depending on when an error occurs during dispatch. + See :ref:`callbacks-and-errors`. + + :param environ: A WSGI environment. + :param start_response: A callable accepting a status code, + a list of headers, and an optional exception context to + start the response. + """ + ctx = self.request_context(environ) + error = None + try: + try: + ctx.push() + response = self.full_dispatch_request() + except Exception as e: + error = e + response = self.handle_exception(e) + except: + error = sys.exc_info()[1] + raise + return response(environ, start_response) + finally: + if self.should_ignore_error(error): + error = None + ctx.auto_pop(error) + + def __call__(self, environ, start_response): + """The WSGI server calls the Flask application object as the + WSGI application. This calls :meth:`wsgi_app` which can be + wrapped to applying middleware.""" + return self.wsgi_app(environ, start_response) + + def __repr__(self): + return '<%s %r>' % ( + self.__class__.__name__, + self.name, + ) diff --git a/venv/lib/python3.7/site-packages/flask/blueprints.py b/venv/lib/python3.7/site-packages/flask/blueprints.py new file mode 100644 index 0000000..c2158fe --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/blueprints.py @@ -0,0 +1,447 @@ +# -*- coding: utf-8 -*- +""" + flask.blueprints + ~~~~~~~~~~~~~~~~ + + Blueprints are the recommended way to implement larger or more + pluggable applications in Flask 0.7 and later. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" +from functools import update_wrapper + +from .helpers import _PackageBoundObject, _endpoint_from_view_func + + +class BlueprintSetupState(object): + """Temporary holder object for registering a blueprint with the + application. An instance of this class is created by the + :meth:`~flask.Blueprint.make_setup_state` method and later passed + to all register callback functions. + """ + + def __init__(self, blueprint, app, options, first_registration): + #: a reference to the current application + self.app = app + + #: a reference to the blueprint that created this setup state. + self.blueprint = blueprint + + #: a dictionary with all options that were passed to the + #: :meth:`~flask.Flask.register_blueprint` method. + self.options = options + + #: as blueprints can be registered multiple times with the + #: application and not everything wants to be registered + #: multiple times on it, this attribute can be used to figure + #: out if the blueprint was registered in the past already. + self.first_registration = first_registration + + subdomain = self.options.get('subdomain') + if subdomain is None: + subdomain = self.blueprint.subdomain + + #: The subdomain that the blueprint should be active for, ``None`` + #: otherwise. + self.subdomain = subdomain + + url_prefix = self.options.get('url_prefix') + if url_prefix is None: + url_prefix = self.blueprint.url_prefix + #: The prefix that should be used for all URLs defined on the + #: blueprint. + self.url_prefix = url_prefix + + #: A dictionary with URL defaults that is added to each and every + #: URL that was defined with the blueprint. + self.url_defaults = dict(self.blueprint.url_values_defaults) + self.url_defaults.update(self.options.get('url_defaults', ())) + + def add_url_rule(self, rule, endpoint=None, view_func=None, **options): + """A helper method to register a rule (and optionally a view function) + to the application. The endpoint is automatically prefixed with the + blueprint's name. + """ + if self.url_prefix is not None: + if rule: + rule = '/'.join(( + self.url_prefix.rstrip('/'), rule.lstrip('/'))) + else: + rule = self.url_prefix + options.setdefault('subdomain', self.subdomain) + if endpoint is None: + endpoint = _endpoint_from_view_func(view_func) + defaults = self.url_defaults + if 'defaults' in options: + defaults = dict(defaults, **options.pop('defaults')) + self.app.add_url_rule(rule, '%s.%s' % (self.blueprint.name, endpoint), + view_func, defaults=defaults, **options) + + +class Blueprint(_PackageBoundObject): + """Represents a blueprint. A blueprint is an object that records + functions that will be called with the + :class:`~flask.blueprints.BlueprintSetupState` later to register functions + or other things on the main application. See :ref:`blueprints` for more + information. + + .. versionadded:: 0.7 + """ + + warn_on_modifications = False + _got_registered_once = False + + #: Blueprint local JSON decoder class to use. + #: Set to ``None`` to use the app's :class:`~flask.app.Flask.json_encoder`. + json_encoder = None + #: Blueprint local JSON decoder class to use. + #: Set to ``None`` to use the app's :class:`~flask.app.Flask.json_decoder`. + json_decoder = None + + # TODO remove the next three attrs when Sphinx :inherited-members: works + # https://github.com/sphinx-doc/sphinx/issues/741 + + #: The name of the package or module that this app belongs to. Do not + #: change this once it is set by the constructor. + import_name = None + + #: Location of the template files to be added to the template lookup. + #: ``None`` if templates should not be added. + template_folder = None + + #: Absolute path to the package on the filesystem. Used to look up + #: resources contained in the package. + root_path = None + + def __init__(self, name, import_name, static_folder=None, + static_url_path=None, template_folder=None, + url_prefix=None, subdomain=None, url_defaults=None, + root_path=None): + _PackageBoundObject.__init__(self, import_name, template_folder, + root_path=root_path) + self.name = name + self.url_prefix = url_prefix + self.subdomain = subdomain + self.static_folder = static_folder + self.static_url_path = static_url_path + self.deferred_functions = [] + if url_defaults is None: + url_defaults = {} + self.url_values_defaults = url_defaults + + def record(self, func): + """Registers a function that is called when the blueprint is + registered on the application. This function is called with the + state as argument as returned by the :meth:`make_setup_state` + method. + """ + if self._got_registered_once and self.warn_on_modifications: + from warnings import warn + warn(Warning('The blueprint was already registered once ' + 'but is getting modified now. These changes ' + 'will not show up.')) + self.deferred_functions.append(func) + + def record_once(self, func): + """Works like :meth:`record` but wraps the function in another + function that will ensure the function is only called once. If the + blueprint is registered a second time on the application, the + function passed is not called. + """ + def wrapper(state): + if state.first_registration: + func(state) + return self.record(update_wrapper(wrapper, func)) + + def make_setup_state(self, app, options, first_registration=False): + """Creates an instance of :meth:`~flask.blueprints.BlueprintSetupState` + object that is later passed to the register callback functions. + Subclasses can override this to return a subclass of the setup state. + """ + return BlueprintSetupState(self, app, options, first_registration) + + def register(self, app, options, first_registration=False): + """Called by :meth:`Flask.register_blueprint` to register all views + and callbacks registered on the blueprint with the application. Creates + a :class:`.BlueprintSetupState` and calls each :meth:`record` callback + with it. + + :param app: The application this blueprint is being registered with. + :param options: Keyword arguments forwarded from + :meth:`~Flask.register_blueprint`. + :param first_registration: Whether this is the first time this + blueprint has been registered on the application. + """ + self._got_registered_once = True + state = self.make_setup_state(app, options, first_registration) + + if self.has_static_folder: + state.add_url_rule( + self.static_url_path + '/', + view_func=self.send_static_file, endpoint='static' + ) + + for deferred in self.deferred_functions: + deferred(state) + + def route(self, rule, **options): + """Like :meth:`Flask.route` but for a blueprint. The endpoint for the + :func:`url_for` function is prefixed with the name of the blueprint. + """ + def decorator(f): + endpoint = options.pop("endpoint", f.__name__) + self.add_url_rule(rule, endpoint, f, **options) + return f + return decorator + + def add_url_rule(self, rule, endpoint=None, view_func=None, **options): + """Like :meth:`Flask.add_url_rule` but for a blueprint. The endpoint for + the :func:`url_for` function is prefixed with the name of the blueprint. + """ + if endpoint: + assert '.' not in endpoint, "Blueprint endpoints should not contain dots" + if view_func and hasattr(view_func, '__name__'): + assert '.' not in view_func.__name__, "Blueprint view function name should not contain dots" + self.record(lambda s: + s.add_url_rule(rule, endpoint, view_func, **options)) + + def endpoint(self, endpoint): + """Like :meth:`Flask.endpoint` but for a blueprint. This does not + prefix the endpoint with the blueprint name, this has to be done + explicitly by the user of this method. If the endpoint is prefixed + with a `.` it will be registered to the current blueprint, otherwise + it's an application independent endpoint. + """ + def decorator(f): + def register_endpoint(state): + state.app.view_functions[endpoint] = f + self.record_once(register_endpoint) + return f + return decorator + + def app_template_filter(self, name=None): + """Register a custom template filter, available application wide. Like + :meth:`Flask.template_filter` but for a blueprint. + + :param name: the optional name of the filter, otherwise the + function name will be used. + """ + def decorator(f): + self.add_app_template_filter(f, name=name) + return f + return decorator + + def add_app_template_filter(self, f, name=None): + """Register a custom template filter, available application wide. Like + :meth:`Flask.add_template_filter` but for a blueprint. Works exactly + like the :meth:`app_template_filter` decorator. + + :param name: the optional name of the filter, otherwise the + function name will be used. + """ + def register_template(state): + state.app.jinja_env.filters[name or f.__name__] = f + self.record_once(register_template) + + def app_template_test(self, name=None): + """Register a custom template test, available application wide. Like + :meth:`Flask.template_test` but for a blueprint. + + .. versionadded:: 0.10 + + :param name: the optional name of the test, otherwise the + function name will be used. + """ + def decorator(f): + self.add_app_template_test(f, name=name) + return f + return decorator + + def add_app_template_test(self, f, name=None): + """Register a custom template test, available application wide. Like + :meth:`Flask.add_template_test` but for a blueprint. Works exactly + like the :meth:`app_template_test` decorator. + + .. versionadded:: 0.10 + + :param name: the optional name of the test, otherwise the + function name will be used. + """ + def register_template(state): + state.app.jinja_env.tests[name or f.__name__] = f + self.record_once(register_template) + + def app_template_global(self, name=None): + """Register a custom template global, available application wide. Like + :meth:`Flask.template_global` but for a blueprint. + + .. versionadded:: 0.10 + + :param name: the optional name of the global, otherwise the + function name will be used. + """ + def decorator(f): + self.add_app_template_global(f, name=name) + return f + return decorator + + def add_app_template_global(self, f, name=None): + """Register a custom template global, available application wide. Like + :meth:`Flask.add_template_global` but for a blueprint. Works exactly + like the :meth:`app_template_global` decorator. + + .. versionadded:: 0.10 + + :param name: the optional name of the global, otherwise the + function name will be used. + """ + def register_template(state): + state.app.jinja_env.globals[name or f.__name__] = f + self.record_once(register_template) + + def before_request(self, f): + """Like :meth:`Flask.before_request` but for a blueprint. This function + is only executed before each request that is handled by a function of + that blueprint. + """ + self.record_once(lambda s: s.app.before_request_funcs + .setdefault(self.name, []).append(f)) + return f + + def before_app_request(self, f): + """Like :meth:`Flask.before_request`. Such a function is executed + before each request, even if outside of a blueprint. + """ + self.record_once(lambda s: s.app.before_request_funcs + .setdefault(None, []).append(f)) + return f + + def before_app_first_request(self, f): + """Like :meth:`Flask.before_first_request`. Such a function is + executed before the first request to the application. + """ + self.record_once(lambda s: s.app.before_first_request_funcs.append(f)) + return f + + def after_request(self, f): + """Like :meth:`Flask.after_request` but for a blueprint. This function + is only executed after each request that is handled by a function of + that blueprint. + """ + self.record_once(lambda s: s.app.after_request_funcs + .setdefault(self.name, []).append(f)) + return f + + def after_app_request(self, f): + """Like :meth:`Flask.after_request` but for a blueprint. Such a function + is executed after each request, even if outside of the blueprint. + """ + self.record_once(lambda s: s.app.after_request_funcs + .setdefault(None, []).append(f)) + return f + + def teardown_request(self, f): + """Like :meth:`Flask.teardown_request` but for a blueprint. This + function is only executed when tearing down requests handled by a + function of that blueprint. Teardown request functions are executed + when the request context is popped, even when no actual request was + performed. + """ + self.record_once(lambda s: s.app.teardown_request_funcs + .setdefault(self.name, []).append(f)) + return f + + def teardown_app_request(self, f): + """Like :meth:`Flask.teardown_request` but for a blueprint. Such a + function is executed when tearing down each request, even if outside of + the blueprint. + """ + self.record_once(lambda s: s.app.teardown_request_funcs + .setdefault(None, []).append(f)) + return f + + def context_processor(self, f): + """Like :meth:`Flask.context_processor` but for a blueprint. This + function is only executed for requests handled by a blueprint. + """ + self.record_once(lambda s: s.app.template_context_processors + .setdefault(self.name, []).append(f)) + return f + + def app_context_processor(self, f): + """Like :meth:`Flask.context_processor` but for a blueprint. Such a + function is executed each request, even if outside of the blueprint. + """ + self.record_once(lambda s: s.app.template_context_processors + .setdefault(None, []).append(f)) + return f + + def app_errorhandler(self, code): + """Like :meth:`Flask.errorhandler` but for a blueprint. This + handler is used for all requests, even if outside of the blueprint. + """ + def decorator(f): + self.record_once(lambda s: s.app.errorhandler(code)(f)) + return f + return decorator + + def url_value_preprocessor(self, f): + """Registers a function as URL value preprocessor for this + blueprint. It's called before the view functions are called and + can modify the url values provided. + """ + self.record_once(lambda s: s.app.url_value_preprocessors + .setdefault(self.name, []).append(f)) + return f + + def url_defaults(self, f): + """Callback function for URL defaults for this blueprint. It's called + with the endpoint and values and should update the values passed + in place. + """ + self.record_once(lambda s: s.app.url_default_functions + .setdefault(self.name, []).append(f)) + return f + + def app_url_value_preprocessor(self, f): + """Same as :meth:`url_value_preprocessor` but application wide. + """ + self.record_once(lambda s: s.app.url_value_preprocessors + .setdefault(None, []).append(f)) + return f + + def app_url_defaults(self, f): + """Same as :meth:`url_defaults` but application wide. + """ + self.record_once(lambda s: s.app.url_default_functions + .setdefault(None, []).append(f)) + return f + + def errorhandler(self, code_or_exception): + """Registers an error handler that becomes active for this blueprint + only. Please be aware that routing does not happen local to a + blueprint so an error handler for 404 usually is not handled by + a blueprint unless it is caused inside a view function. Another + special case is the 500 internal server error which is always looked + up from the application. + + Otherwise works as the :meth:`~flask.Flask.errorhandler` decorator + of the :class:`~flask.Flask` object. + """ + def decorator(f): + self.record_once(lambda s: s.app._register_error_handler( + self.name, code_or_exception, f)) + return f + return decorator + + def register_error_handler(self, code_or_exception, f): + """Non-decorator version of the :meth:`errorhandler` error attach + function, akin to the :meth:`~flask.Flask.register_error_handler` + application-wide function of the :class:`~flask.Flask` object but + for error handlers limited to this blueprint. + + .. versionadded:: 0.11 + """ + self.record_once(lambda s: s.app._register_error_handler( + self.name, code_or_exception, f)) diff --git a/venv/lib/python3.7/site-packages/flask/cli.py b/venv/lib/python3.7/site-packages/flask/cli.py new file mode 100644 index 0000000..3eb93b3 --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/cli.py @@ -0,0 +1,910 @@ +# -*- coding: utf-8 -*- +""" + flask.cli + ~~~~~~~~~ + + A simple command line application to run flask apps. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +from __future__ import print_function + +import ast +import inspect +import os +import platform +import re +import ssl +import sys +import traceback +from functools import update_wrapper +from operator import attrgetter +from threading import Lock, Thread + +import click +from werkzeug.utils import import_string + +from . import __version__ +from ._compat import getargspec, iteritems, reraise, text_type +from .globals import current_app +from .helpers import get_debug_flag, get_env, get_load_dotenv + +try: + import dotenv +except ImportError: + dotenv = None + + +class NoAppException(click.UsageError): + """Raised if an application cannot be found or loaded.""" + + +def find_best_app(script_info, module): + """Given a module instance this tries to find the best possible + application in the module or raises an exception. + """ + from . import Flask + + # Search for the most common names first. + for attr_name in ('app', 'application'): + app = getattr(module, attr_name, None) + + if isinstance(app, Flask): + return app + + # Otherwise find the only object that is a Flask instance. + matches = [ + v for k, v in iteritems(module.__dict__) if isinstance(v, Flask) + ] + + if len(matches) == 1: + return matches[0] + elif len(matches) > 1: + raise NoAppException( + 'Detected multiple Flask applications in module "{module}". Use ' + '"FLASK_APP={module}:name" to specify the correct ' + 'one.'.format(module=module.__name__) + ) + + # Search for app factory functions. + for attr_name in ('create_app', 'make_app'): + app_factory = getattr(module, attr_name, None) + + if inspect.isfunction(app_factory): + try: + app = call_factory(script_info, app_factory) + + if isinstance(app, Flask): + return app + except TypeError: + if not _called_with_wrong_args(app_factory): + raise + raise NoAppException( + 'Detected factory "{factory}" in module "{module}", but ' + 'could not call it without arguments. Use ' + '"FLASK_APP=\'{module}:{factory}(args)\'" to specify ' + 'arguments.'.format( + factory=attr_name, module=module.__name__ + ) + ) + + raise NoAppException( + 'Failed to find Flask application or factory in module "{module}". ' + 'Use "FLASK_APP={module}:name to specify one.'.format( + module=module.__name__ + ) + ) + + +def call_factory(script_info, app_factory, arguments=()): + """Takes an app factory, a ``script_info` object and optionally a tuple + of arguments. Checks for the existence of a script_info argument and calls + the app_factory depending on that and the arguments provided. + """ + args_spec = getargspec(app_factory) + arg_names = args_spec.args + arg_defaults = args_spec.defaults + + if 'script_info' in arg_names: + return app_factory(*arguments, script_info=script_info) + elif arguments: + return app_factory(*arguments) + elif not arguments and len(arg_names) == 1 and arg_defaults is None: + return app_factory(script_info) + + return app_factory() + + +def _called_with_wrong_args(factory): + """Check whether calling a function raised a ``TypeError`` because + the call failed or because something in the factory raised the + error. + + :param factory: the factory function that was called + :return: true if the call failed + """ + tb = sys.exc_info()[2] + + try: + while tb is not None: + if tb.tb_frame.f_code is factory.__code__: + # in the factory, it was called successfully + return False + + tb = tb.tb_next + + # didn't reach the factory + return True + finally: + del tb + + +def find_app_by_string(script_info, module, app_name): + """Checks if the given string is a variable name or a function. If it is a + function, it checks for specified arguments and whether it takes a + ``script_info`` argument and calls the function with the appropriate + arguments. + """ + from flask import Flask + match = re.match(r'^ *([^ ()]+) *(?:\((.*?) *,? *\))? *$', app_name) + + if not match: + raise NoAppException( + '"{name}" is not a valid variable name or function ' + 'expression.'.format(name=app_name) + ) + + name, args = match.groups() + + try: + attr = getattr(module, name) + except AttributeError as e: + raise NoAppException(e.args[0]) + + if inspect.isfunction(attr): + if args: + try: + args = ast.literal_eval('({args},)'.format(args=args)) + except (ValueError, SyntaxError)as e: + raise NoAppException( + 'Could not parse the arguments in ' + '"{app_name}".'.format(e=e, app_name=app_name) + ) + else: + args = () + + try: + app = call_factory(script_info, attr, args) + except TypeError as e: + if not _called_with_wrong_args(attr): + raise + + raise NoAppException( + '{e}\nThe factory "{app_name}" in module "{module}" could not ' + 'be called with the specified arguments.'.format( + e=e, app_name=app_name, module=module.__name__ + ) + ) + else: + app = attr + + if isinstance(app, Flask): + return app + + raise NoAppException( + 'A valid Flask application was not obtained from ' + '"{module}:{app_name}".'.format( + module=module.__name__, app_name=app_name + ) + ) + + +def prepare_import(path): + """Given a filename this will try to calculate the python path, add it + to the search path and return the actual module name that is expected. + """ + path = os.path.realpath(path) + + if os.path.splitext(path)[1] == '.py': + path = os.path.splitext(path)[0] + + if os.path.basename(path) == '__init__': + path = os.path.dirname(path) + + module_name = [] + + # move up until outside package structure (no __init__.py) + while True: + path, name = os.path.split(path) + module_name.append(name) + + if not os.path.exists(os.path.join(path, '__init__.py')): + break + + if sys.path[0] != path: + sys.path.insert(0, path) + + return '.'.join(module_name[::-1]) + + +def locate_app(script_info, module_name, app_name, raise_if_not_found=True): + __traceback_hide__ = True + + try: + __import__(module_name) + except ImportError: + # Reraise the ImportError if it occurred within the imported module. + # Determine this by checking whether the trace has a depth > 1. + if sys.exc_info()[-1].tb_next: + raise NoAppException( + 'While importing "{name}", an ImportError was raised:' + '\n\n{tb}'.format(name=module_name, tb=traceback.format_exc()) + ) + elif raise_if_not_found: + raise NoAppException( + 'Could not import "{name}".'.format(name=module_name) + ) + else: + return + + module = sys.modules[module_name] + + if app_name is None: + return find_best_app(script_info, module) + else: + return find_app_by_string(script_info, module, app_name) + + +def get_version(ctx, param, value): + if not value or ctx.resilient_parsing: + return + import werkzeug + message = ( + 'Python %(python)s\n' + 'Flask %(flask)s\n' + 'Werkzeug %(werkzeug)s' + ) + click.echo(message % { + 'python': platform.python_version(), + 'flask': __version__, + 'werkzeug': werkzeug.__version__, + }, color=ctx.color) + ctx.exit() + + +version_option = click.Option( + ['--version'], + help='Show the flask version', + expose_value=False, + callback=get_version, + is_flag=True, + is_eager=True +) + + +class DispatchingApp(object): + """Special application that dispatches to a Flask application which + is imported by name in a background thread. If an error happens + it is recorded and shown as part of the WSGI handling which in case + of the Werkzeug debugger means that it shows up in the browser. + """ + + def __init__(self, loader, use_eager_loading=False): + self.loader = loader + self._app = None + self._lock = Lock() + self._bg_loading_exc_info = None + if use_eager_loading: + self._load_unlocked() + else: + self._load_in_background() + + def _load_in_background(self): + def _load_app(): + __traceback_hide__ = True + with self._lock: + try: + self._load_unlocked() + except Exception: + self._bg_loading_exc_info = sys.exc_info() + t = Thread(target=_load_app, args=()) + t.start() + + def _flush_bg_loading_exception(self): + __traceback_hide__ = True + exc_info = self._bg_loading_exc_info + if exc_info is not None: + self._bg_loading_exc_info = None + reraise(*exc_info) + + def _load_unlocked(self): + __traceback_hide__ = True + self._app = rv = self.loader() + self._bg_loading_exc_info = None + return rv + + def __call__(self, environ, start_response): + __traceback_hide__ = True + if self._app is not None: + return self._app(environ, start_response) + self._flush_bg_loading_exception() + with self._lock: + if self._app is not None: + rv = self._app + else: + rv = self._load_unlocked() + return rv(environ, start_response) + + +class ScriptInfo(object): + """Helper object to deal with Flask applications. This is usually not + necessary to interface with as it's used internally in the dispatching + to click. In future versions of Flask this object will most likely play + a bigger role. Typically it's created automatically by the + :class:`FlaskGroup` but you can also manually create it and pass it + onwards as click object. + """ + + def __init__(self, app_import_path=None, create_app=None, + set_debug_flag=True): + #: Optionally the import path for the Flask application. + self.app_import_path = app_import_path or os.environ.get('FLASK_APP') + #: Optionally a function that is passed the script info to create + #: the instance of the application. + self.create_app = create_app + #: A dictionary with arbitrary data that can be associated with + #: this script info. + self.data = {} + self.set_debug_flag = set_debug_flag + self._loaded_app = None + + def load_app(self): + """Loads the Flask app (if not yet loaded) and returns it. Calling + this multiple times will just result in the already loaded app to + be returned. + """ + __traceback_hide__ = True + + if self._loaded_app is not None: + return self._loaded_app + + app = None + + if self.create_app is not None: + app = call_factory(self, self.create_app) + else: + if self.app_import_path: + path, name = (re.split(r':(?![\\/])', self.app_import_path, 1) + [None])[:2] + import_name = prepare_import(path) + app = locate_app(self, import_name, name) + else: + for path in ('wsgi.py', 'app.py'): + import_name = prepare_import(path) + app = locate_app(self, import_name, None, + raise_if_not_found=False) + + if app: + break + + if not app: + raise NoAppException( + 'Could not locate a Flask application. You did not provide ' + 'the "FLASK_APP" environment variable, and a "wsgi.py" or ' + '"app.py" module was not found in the current directory.' + ) + + if self.set_debug_flag: + # Update the app's debug flag through the descriptor so that + # other values repopulate as well. + app.debug = get_debug_flag() + + self._loaded_app = app + return app + + +pass_script_info = click.make_pass_decorator(ScriptInfo, ensure=True) + + +def with_appcontext(f): + """Wraps a callback so that it's guaranteed to be executed with the + script's application context. If callbacks are registered directly + to the ``app.cli`` object then they are wrapped with this function + by default unless it's disabled. + """ + @click.pass_context + def decorator(__ctx, *args, **kwargs): + with __ctx.ensure_object(ScriptInfo).load_app().app_context(): + return __ctx.invoke(f, *args, **kwargs) + return update_wrapper(decorator, f) + + +class AppGroup(click.Group): + """This works similar to a regular click :class:`~click.Group` but it + changes the behavior of the :meth:`command` decorator so that it + automatically wraps the functions in :func:`with_appcontext`. + + Not to be confused with :class:`FlaskGroup`. + """ + + def command(self, *args, **kwargs): + """This works exactly like the method of the same name on a regular + :class:`click.Group` but it wraps callbacks in :func:`with_appcontext` + unless it's disabled by passing ``with_appcontext=False``. + """ + wrap_for_ctx = kwargs.pop('with_appcontext', True) + def decorator(f): + if wrap_for_ctx: + f = with_appcontext(f) + return click.Group.command(self, *args, **kwargs)(f) + return decorator + + def group(self, *args, **kwargs): + """This works exactly like the method of the same name on a regular + :class:`click.Group` but it defaults the group class to + :class:`AppGroup`. + """ + kwargs.setdefault('cls', AppGroup) + return click.Group.group(self, *args, **kwargs) + + +class FlaskGroup(AppGroup): + """Special subclass of the :class:`AppGroup` group that supports + loading more commands from the configured Flask app. Normally a + developer does not have to interface with this class but there are + some very advanced use cases for which it makes sense to create an + instance of this. + + For information as of why this is useful see :ref:`custom-scripts`. + + :param add_default_commands: if this is True then the default run and + shell commands wil be added. + :param add_version_option: adds the ``--version`` option. + :param create_app: an optional callback that is passed the script info and + returns the loaded app. + :param load_dotenv: Load the nearest :file:`.env` and :file:`.flaskenv` + files to set environment variables. Will also change the working + directory to the directory containing the first file found. + :param set_debug_flag: Set the app's debug flag based on the active + environment + + .. versionchanged:: 1.0 + If installed, python-dotenv will be used to load environment variables + from :file:`.env` and :file:`.flaskenv` files. + """ + + def __init__(self, add_default_commands=True, create_app=None, + add_version_option=True, load_dotenv=True, + set_debug_flag=True, **extra): + params = list(extra.pop('params', None) or ()) + + if add_version_option: + params.append(version_option) + + AppGroup.__init__(self, params=params, **extra) + self.create_app = create_app + self.load_dotenv = load_dotenv + self.set_debug_flag = set_debug_flag + + if add_default_commands: + self.add_command(run_command) + self.add_command(shell_command) + self.add_command(routes_command) + + self._loaded_plugin_commands = False + + def _load_plugin_commands(self): + if self._loaded_plugin_commands: + return + try: + import pkg_resources + except ImportError: + self._loaded_plugin_commands = True + return + + for ep in pkg_resources.iter_entry_points('flask.commands'): + self.add_command(ep.load(), ep.name) + self._loaded_plugin_commands = True + + def get_command(self, ctx, name): + self._load_plugin_commands() + + # We load built-in commands first as these should always be the + # same no matter what the app does. If the app does want to + # override this it needs to make a custom instance of this group + # and not attach the default commands. + # + # This also means that the script stays functional in case the + # application completely fails. + rv = AppGroup.get_command(self, ctx, name) + if rv is not None: + return rv + + info = ctx.ensure_object(ScriptInfo) + try: + rv = info.load_app().cli.get_command(ctx, name) + if rv is not None: + return rv + except NoAppException: + pass + + def list_commands(self, ctx): + self._load_plugin_commands() + + # The commands available is the list of both the application (if + # available) plus the builtin commands. + rv = set(click.Group.list_commands(self, ctx)) + info = ctx.ensure_object(ScriptInfo) + try: + rv.update(info.load_app().cli.list_commands(ctx)) + except Exception: + # Here we intentionally swallow all exceptions as we don't + # want the help page to break if the app does not exist. + # If someone attempts to use the command we try to create + # the app again and this will give us the error. + # However, we will not do so silently because that would confuse + # users. + traceback.print_exc() + return sorted(rv) + + def main(self, *args, **kwargs): + # Set a global flag that indicates that we were invoked from the + # command line interface. This is detected by Flask.run to make the + # call into a no-op. This is necessary to avoid ugly errors when the + # script that is loaded here also attempts to start a server. + os.environ['FLASK_RUN_FROM_CLI'] = 'true' + + if get_load_dotenv(self.load_dotenv): + load_dotenv() + + obj = kwargs.get('obj') + + if obj is None: + obj = ScriptInfo(create_app=self.create_app, + set_debug_flag=self.set_debug_flag) + + kwargs['obj'] = obj + kwargs.setdefault('auto_envvar_prefix', 'FLASK') + return super(FlaskGroup, self).main(*args, **kwargs) + + +def _path_is_ancestor(path, other): + """Take ``other`` and remove the length of ``path`` from it. Then join it + to ``path``. If it is the original value, ``path`` is an ancestor of + ``other``.""" + return os.path.join(path, other[len(path):].lstrip(os.sep)) == other + + +def load_dotenv(path=None): + """Load "dotenv" files in order of precedence to set environment variables. + + If an env var is already set it is not overwritten, so earlier files in the + list are preferred over later files. + + Changes the current working directory to the location of the first file + found, with the assumption that it is in the top level project directory + and will be where the Python path should import local packages from. + + This is a no-op if `python-dotenv`_ is not installed. + + .. _python-dotenv: https://github.com/theskumar/python-dotenv#readme + + :param path: Load the file at this location instead of searching. + :return: ``True`` if a file was loaded. + + .. versionadded:: 1.0 + """ + if dotenv is None: + if path or os.path.exists('.env') or os.path.exists('.flaskenv'): + click.secho( + ' * Tip: There are .env files present.' + ' Do "pip install python-dotenv" to use them.', + fg='yellow') + return + + if path is not None: + return dotenv.load_dotenv(path) + + new_dir = None + + for name in ('.env', '.flaskenv'): + path = dotenv.find_dotenv(name, usecwd=True) + + if not path: + continue + + if new_dir is None: + new_dir = os.path.dirname(path) + + dotenv.load_dotenv(path) + + if new_dir and os.getcwd() != new_dir: + os.chdir(new_dir) + + return new_dir is not None # at least one file was located and loaded + + +def show_server_banner(env, debug, app_import_path, eager_loading): + """Show extra startup messages the first time the server is run, + ignoring the reloader. + """ + if os.environ.get('WERKZEUG_RUN_MAIN') == 'true': + return + + if app_import_path is not None: + message = ' * Serving Flask app "{0}"'.format(app_import_path) + + if not eager_loading: + message += ' (lazy loading)' + + click.echo(message) + + click.echo(' * Environment: {0}'.format(env)) + + if env == 'production': + click.secho( + ' WARNING: This is a development server. ' + 'Do not use it in a production deployment.', fg='red') + click.secho(' Use a production WSGI server instead.', dim=True) + + if debug is not None: + click.echo(' * Debug mode: {0}'.format('on' if debug else 'off')) + + +class CertParamType(click.ParamType): + """Click option type for the ``--cert`` option. Allows either an + existing file, the string ``'adhoc'``, or an import for a + :class:`~ssl.SSLContext` object. + """ + + name = 'path' + + def __init__(self): + self.path_type = click.Path( + exists=True, dir_okay=False, resolve_path=True) + + def convert(self, value, param, ctx): + try: + return self.path_type(value, param, ctx) + except click.BadParameter: + value = click.STRING(value, param, ctx).lower() + + if value == 'adhoc': + try: + import OpenSSL + except ImportError: + raise click.BadParameter( + 'Using ad-hoc certificates requires pyOpenSSL.', + ctx, param) + + return value + + obj = import_string(value, silent=True) + + if sys.version_info < (2, 7, 9): + if obj: + return obj + else: + if isinstance(obj, ssl.SSLContext): + return obj + + raise + + +def _validate_key(ctx, param, value): + """The ``--key`` option must be specified when ``--cert`` is a file. + Modifies the ``cert`` param to be a ``(cert, key)`` pair if needed. + """ + cert = ctx.params.get('cert') + is_adhoc = cert == 'adhoc' + + if sys.version_info < (2, 7, 9): + is_context = cert and not isinstance(cert, (text_type, bytes)) + else: + is_context = isinstance(cert, ssl.SSLContext) + + if value is not None: + if is_adhoc: + raise click.BadParameter( + 'When "--cert" is "adhoc", "--key" is not used.', + ctx, param) + + if is_context: + raise click.BadParameter( + 'When "--cert" is an SSLContext object, "--key is not used.', + ctx, param) + + if not cert: + raise click.BadParameter( + '"--cert" must also be specified.', + ctx, param) + + ctx.params['cert'] = cert, value + + else: + if cert and not (is_adhoc or is_context): + raise click.BadParameter( + 'Required when using "--cert".', + ctx, param) + + return value + + +@click.command('run', short_help='Run a development server.') +@click.option('--host', '-h', default='127.0.0.1', + help='The interface to bind to.') +@click.option('--port', '-p', default=5000, + help='The port to bind to.') +@click.option('--cert', type=CertParamType(), + help='Specify a certificate file to use HTTPS.') +@click.option('--key', + type=click.Path(exists=True, dir_okay=False, resolve_path=True), + callback=_validate_key, expose_value=False, + help='The key file to use when specifying a certificate.') +@click.option('--reload/--no-reload', default=None, + help='Enable or disable the reloader. By default the reloader ' + 'is active if debug is enabled.') +@click.option('--debugger/--no-debugger', default=None, + help='Enable or disable the debugger. By default the debugger ' + 'is active if debug is enabled.') +@click.option('--eager-loading/--lazy-loader', default=None, + help='Enable or disable eager loading. By default eager ' + 'loading is enabled if the reloader is disabled.') +@click.option('--with-threads/--without-threads', default=True, + help='Enable or disable multithreading.') +@pass_script_info +def run_command(info, host, port, reload, debugger, eager_loading, + with_threads, cert): + """Run a local development server. + + This server is for development purposes only. It does not provide + the stability, security, or performance of production WSGI servers. + + The reloader and debugger are enabled by default if + FLASK_ENV=development or FLASK_DEBUG=1. + """ + debug = get_debug_flag() + + if reload is None: + reload = debug + + if debugger is None: + debugger = debug + + if eager_loading is None: + eager_loading = not reload + + show_server_banner(get_env(), debug, info.app_import_path, eager_loading) + app = DispatchingApp(info.load_app, use_eager_loading=eager_loading) + + from werkzeug.serving import run_simple + run_simple(host, port, app, use_reloader=reload, use_debugger=debugger, + threaded=with_threads, ssl_context=cert) + + +@click.command('shell', short_help='Run a shell in the app context.') +@with_appcontext +def shell_command(): + """Run an interactive Python shell in the context of a given + Flask application. The application will populate the default + namespace of this shell according to it's configuration. + + This is useful for executing small snippets of management code + without having to manually configure the application. + """ + import code + from flask.globals import _app_ctx_stack + app = _app_ctx_stack.top.app + banner = 'Python %s on %s\nApp: %s [%s]\nInstance: %s' % ( + sys.version, + sys.platform, + app.import_name, + app.env, + app.instance_path, + ) + ctx = {} + + # Support the regular Python interpreter startup script if someone + # is using it. + startup = os.environ.get('PYTHONSTARTUP') + if startup and os.path.isfile(startup): + with open(startup, 'r') as f: + eval(compile(f.read(), startup, 'exec'), ctx) + + ctx.update(app.make_shell_context()) + + code.interact(banner=banner, local=ctx) + + +@click.command('routes', short_help='Show the routes for the app.') +@click.option( + '--sort', '-s', + type=click.Choice(('endpoint', 'methods', 'rule', 'match')), + default='endpoint', + help=( + 'Method to sort routes by. "match" is the order that Flask will match ' + 'routes when dispatching a request.' + ) +) +@click.option( + '--all-methods', + is_flag=True, + help="Show HEAD and OPTIONS methods." +) +@with_appcontext +def routes_command(sort, all_methods): + """Show all registered routes with endpoints and methods.""" + + rules = list(current_app.url_map.iter_rules()) + if not rules: + click.echo('No routes were registered.') + return + + ignored_methods = set(() if all_methods else ('HEAD', 'OPTIONS')) + + if sort in ('endpoint', 'rule'): + rules = sorted(rules, key=attrgetter(sort)) + elif sort == 'methods': + rules = sorted(rules, key=lambda rule: sorted(rule.methods)) + + rule_methods = [ + ', '.join(sorted(rule.methods - ignored_methods)) for rule in rules + ] + + headers = ('Endpoint', 'Methods', 'Rule') + widths = ( + max(len(rule.endpoint) for rule in rules), + max(len(methods) for methods in rule_methods), + max(len(rule.rule) for rule in rules), + ) + widths = [max(len(h), w) for h, w in zip(headers, widths)] + row = '{{0:<{0}}} {{1:<{1}}} {{2:<{2}}}'.format(*widths) + + click.echo(row.format(*headers).strip()) + click.echo(row.format(*('-' * width for width in widths))) + + for rule, methods in zip(rules, rule_methods): + click.echo(row.format(rule.endpoint, methods, rule.rule).rstrip()) + + +cli = FlaskGroup(help="""\ +A general utility script for Flask applications. + +Provides commands from Flask, extensions, and the application. Loads the +application defined in the FLASK_APP environment variable, or from a wsgi.py +file. Setting the FLASK_ENV environment variable to 'development' will enable +debug mode. + +\b + {prefix}{cmd} FLASK_APP=hello.py + {prefix}{cmd} FLASK_ENV=development + {prefix}flask run +""".format( + cmd='export' if os.name == 'posix' else 'set', + prefix='$ ' if os.name == 'posix' else '> ' +)) + + +def main(as_module=False): + args = sys.argv[1:] + + if as_module: + this_module = 'flask' + + if sys.version_info < (2, 7): + this_module += '.cli' + + name = 'python -m ' + this_module + + # Python rewrites "python -m flask" to the path to the file in argv. + # Restore the original command so that the reloader works. + sys.argv = ['-m', this_module] + args + else: + name = None + + cli.main(args=args, prog_name=name) + + +if __name__ == '__main__': + main(as_module=True) diff --git a/venv/lib/python3.7/site-packages/flask/config.py b/venv/lib/python3.7/site-packages/flask/config.py new file mode 100644 index 0000000..a5475ed --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/config.py @@ -0,0 +1,269 @@ +# -*- coding: utf-8 -*- +""" + flask.config + ~~~~~~~~~~~~ + + Implements the configuration related objects. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +import os +import types +import errno + +from werkzeug.utils import import_string +from ._compat import string_types, iteritems +from . import json + + +class ConfigAttribute(object): + """Makes an attribute forward to the config""" + + def __init__(self, name, get_converter=None): + self.__name__ = name + self.get_converter = get_converter + + def __get__(self, obj, type=None): + if obj is None: + return self + rv = obj.config[self.__name__] + if self.get_converter is not None: + rv = self.get_converter(rv) + return rv + + def __set__(self, obj, value): + obj.config[self.__name__] = value + + +class Config(dict): + """Works exactly like a dict but provides ways to fill it from files + or special dictionaries. There are two common patterns to populate the + config. + + Either you can fill the config from a config file:: + + app.config.from_pyfile('yourconfig.cfg') + + Or alternatively you can define the configuration options in the + module that calls :meth:`from_object` or provide an import path to + a module that should be loaded. It is also possible to tell it to + use the same module and with that provide the configuration values + just before the call:: + + DEBUG = True + SECRET_KEY = 'development key' + app.config.from_object(__name__) + + In both cases (loading from any Python file or loading from modules), + only uppercase keys are added to the config. This makes it possible to use + lowercase values in the config file for temporary values that are not added + to the config or to define the config keys in the same file that implements + the application. + + Probably the most interesting way to load configurations is from an + environment variable pointing to a file:: + + app.config.from_envvar('YOURAPPLICATION_SETTINGS') + + In this case before launching the application you have to set this + environment variable to the file you want to use. On Linux and OS X + use the export statement:: + + export YOURAPPLICATION_SETTINGS='/path/to/config/file' + + On windows use `set` instead. + + :param root_path: path to which files are read relative from. When the + config object is created by the application, this is + the application's :attr:`~flask.Flask.root_path`. + :param defaults: an optional dictionary of default values + """ + + def __init__(self, root_path, defaults=None): + dict.__init__(self, defaults or {}) + self.root_path = root_path + + def from_envvar(self, variable_name, silent=False): + """Loads a configuration from an environment variable pointing to + a configuration file. This is basically just a shortcut with nicer + error messages for this line of code:: + + app.config.from_pyfile(os.environ['YOURAPPLICATION_SETTINGS']) + + :param variable_name: name of the environment variable + :param silent: set to ``True`` if you want silent failure for missing + files. + :return: bool. ``True`` if able to load config, ``False`` otherwise. + """ + rv = os.environ.get(variable_name) + if not rv: + if silent: + return False + raise RuntimeError('The environment variable %r is not set ' + 'and as such configuration could not be ' + 'loaded. Set this variable and make it ' + 'point to a configuration file' % + variable_name) + return self.from_pyfile(rv, silent=silent) + + def from_pyfile(self, filename, silent=False): + """Updates the values in the config from a Python file. This function + behaves as if the file was imported as module with the + :meth:`from_object` function. + + :param filename: the filename of the config. This can either be an + absolute filename or a filename relative to the + root path. + :param silent: set to ``True`` if you want silent failure for missing + files. + + .. versionadded:: 0.7 + `silent` parameter. + """ + filename = os.path.join(self.root_path, filename) + d = types.ModuleType('config') + d.__file__ = filename + try: + with open(filename, mode='rb') as config_file: + exec(compile(config_file.read(), filename, 'exec'), d.__dict__) + except IOError as e: + if silent and e.errno in ( + errno.ENOENT, errno.EISDIR, errno.ENOTDIR + ): + return False + e.strerror = 'Unable to load configuration file (%s)' % e.strerror + raise + self.from_object(d) + return True + + def from_object(self, obj): + """Updates the values from the given object. An object can be of one + of the following two types: + + - a string: in this case the object with that name will be imported + - an actual object reference: that object is used directly + + Objects are usually either modules or classes. :meth:`from_object` + loads only the uppercase attributes of the module/class. A ``dict`` + object will not work with :meth:`from_object` because the keys of a + ``dict`` are not attributes of the ``dict`` class. + + Example of module-based configuration:: + + app.config.from_object('yourapplication.default_config') + from yourapplication import default_config + app.config.from_object(default_config) + + Nothing is done to the object before loading. If the object is a + class and has ``@property`` attributes, it needs to be + instantiated before being passed to this method. + + You should not use this function to load the actual configuration but + rather configuration defaults. The actual config should be loaded + with :meth:`from_pyfile` and ideally from a location not within the + package because the package might be installed system wide. + + See :ref:`config-dev-prod` for an example of class-based configuration + using :meth:`from_object`. + + :param obj: an import name or object + """ + if isinstance(obj, string_types): + obj = import_string(obj) + for key in dir(obj): + if key.isupper(): + self[key] = getattr(obj, key) + + def from_json(self, filename, silent=False): + """Updates the values in the config from a JSON file. This function + behaves as if the JSON object was a dictionary and passed to the + :meth:`from_mapping` function. + + :param filename: the filename of the JSON file. This can either be an + absolute filename or a filename relative to the + root path. + :param silent: set to ``True`` if you want silent failure for missing + files. + + .. versionadded:: 0.11 + """ + filename = os.path.join(self.root_path, filename) + + try: + with open(filename) as json_file: + obj = json.loads(json_file.read()) + except IOError as e: + if silent and e.errno in (errno.ENOENT, errno.EISDIR): + return False + e.strerror = 'Unable to load configuration file (%s)' % e.strerror + raise + return self.from_mapping(obj) + + def from_mapping(self, *mapping, **kwargs): + """Updates the config like :meth:`update` ignoring items with non-upper + keys. + + .. versionadded:: 0.11 + """ + mappings = [] + if len(mapping) == 1: + if hasattr(mapping[0], 'items'): + mappings.append(mapping[0].items()) + else: + mappings.append(mapping[0]) + elif len(mapping) > 1: + raise TypeError( + 'expected at most 1 positional argument, got %d' % len(mapping) + ) + mappings.append(kwargs.items()) + for mapping in mappings: + for (key, value) in mapping: + if key.isupper(): + self[key] = value + return True + + def get_namespace(self, namespace, lowercase=True, trim_namespace=True): + """Returns a dictionary containing a subset of configuration options + that match the specified namespace/prefix. Example usage:: + + app.config['IMAGE_STORE_TYPE'] = 'fs' + app.config['IMAGE_STORE_PATH'] = '/var/app/images' + app.config['IMAGE_STORE_BASE_URL'] = 'http://img.website.com' + image_store_config = app.config.get_namespace('IMAGE_STORE_') + + The resulting dictionary `image_store_config` would look like:: + + { + 'type': 'fs', + 'path': '/var/app/images', + 'base_url': 'http://img.website.com' + } + + This is often useful when configuration options map directly to + keyword arguments in functions or class constructors. + + :param namespace: a configuration namespace + :param lowercase: a flag indicating if the keys of the resulting + dictionary should be lowercase + :param trim_namespace: a flag indicating if the keys of the resulting + dictionary should not include the namespace + + .. versionadded:: 0.11 + """ + rv = {} + for k, v in iteritems(self): + if not k.startswith(namespace): + continue + if trim_namespace: + key = k[len(namespace):] + else: + key = k + if lowercase: + key = key.lower() + rv[key] = v + return rv + + def __repr__(self): + return '<%s %s>' % (self.__class__.__name__, dict.__repr__(self)) diff --git a/venv/lib/python3.7/site-packages/flask/ctx.py b/venv/lib/python3.7/site-packages/flask/ctx.py new file mode 100644 index 0000000..ec8e787 --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/ctx.py @@ -0,0 +1,457 @@ +# -*- coding: utf-8 -*- +""" + flask.ctx + ~~~~~~~~~ + + Implements the objects required to keep the context. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +import sys +from functools import update_wrapper + +from werkzeug.exceptions import HTTPException + +from .globals import _request_ctx_stack, _app_ctx_stack +from .signals import appcontext_pushed, appcontext_popped +from ._compat import BROKEN_PYPY_CTXMGR_EXIT, reraise + + +# a singleton sentinel value for parameter defaults +_sentinel = object() + + +class _AppCtxGlobals(object): + """A plain object. Used as a namespace for storing data during an + application context. + + Creating an app context automatically creates this object, which is + made available as the :data:`g` proxy. + + .. describe:: 'key' in g + + Check whether an attribute is present. + + .. versionadded:: 0.10 + + .. describe:: iter(g) + + Return an iterator over the attribute names. + + .. versionadded:: 0.10 + """ + + def get(self, name, default=None): + """Get an attribute by name, or a default value. Like + :meth:`dict.get`. + + :param name: Name of attribute to get. + :param default: Value to return if the attribute is not present. + + .. versionadded:: 0.10 + """ + return self.__dict__.get(name, default) + + def pop(self, name, default=_sentinel): + """Get and remove an attribute by name. Like :meth:`dict.pop`. + + :param name: Name of attribute to pop. + :param default: Value to return if the attribute is not present, + instead of raise a ``KeyError``. + + .. versionadded:: 0.11 + """ + if default is _sentinel: + return self.__dict__.pop(name) + else: + return self.__dict__.pop(name, default) + + def setdefault(self, name, default=None): + """Get the value of an attribute if it is present, otherwise + set and return a default value. Like :meth:`dict.setdefault`. + + :param name: Name of attribute to get. + :param: default: Value to set and return if the attribute is not + present. + + .. versionadded:: 0.11 + """ + return self.__dict__.setdefault(name, default) + + def __contains__(self, item): + return item in self.__dict__ + + def __iter__(self): + return iter(self.__dict__) + + def __repr__(self): + top = _app_ctx_stack.top + if top is not None: + return '' % top.app.name + return object.__repr__(self) + + +def after_this_request(f): + """Executes a function after this request. This is useful to modify + response objects. The function is passed the response object and has + to return the same or a new one. + + Example:: + + @app.route('/') + def index(): + @after_this_request + def add_header(response): + response.headers['X-Foo'] = 'Parachute' + return response + return 'Hello World!' + + This is more useful if a function other than the view function wants to + modify a response. For instance think of a decorator that wants to add + some headers without converting the return value into a response object. + + .. versionadded:: 0.9 + """ + _request_ctx_stack.top._after_request_functions.append(f) + return f + + +def copy_current_request_context(f): + """A helper function that decorates a function to retain the current + request context. This is useful when working with greenlets. The moment + the function is decorated a copy of the request context is created and + then pushed when the function is called. + + Example:: + + import gevent + from flask import copy_current_request_context + + @app.route('/') + def index(): + @copy_current_request_context + def do_some_work(): + # do some work here, it can access flask.request like you + # would otherwise in the view function. + ... + gevent.spawn(do_some_work) + return 'Regular response' + + .. versionadded:: 0.10 + """ + top = _request_ctx_stack.top + if top is None: + raise RuntimeError('This decorator can only be used at local scopes ' + 'when a request context is on the stack. For instance within ' + 'view functions.') + reqctx = top.copy() + def wrapper(*args, **kwargs): + with reqctx: + return f(*args, **kwargs) + return update_wrapper(wrapper, f) + + +def has_request_context(): + """If you have code that wants to test if a request context is there or + not this function can be used. For instance, you may want to take advantage + of request information if the request object is available, but fail + silently if it is unavailable. + + :: + + class User(db.Model): + + def __init__(self, username, remote_addr=None): + self.username = username + if remote_addr is None and has_request_context(): + remote_addr = request.remote_addr + self.remote_addr = remote_addr + + Alternatively you can also just test any of the context bound objects + (such as :class:`request` or :class:`g`) for truthness:: + + class User(db.Model): + + def __init__(self, username, remote_addr=None): + self.username = username + if remote_addr is None and request: + remote_addr = request.remote_addr + self.remote_addr = remote_addr + + .. versionadded:: 0.7 + """ + return _request_ctx_stack.top is not None + + +def has_app_context(): + """Works like :func:`has_request_context` but for the application + context. You can also just do a boolean check on the + :data:`current_app` object instead. + + .. versionadded:: 0.9 + """ + return _app_ctx_stack.top is not None + + +class AppContext(object): + """The application context binds an application object implicitly + to the current thread or greenlet, similar to how the + :class:`RequestContext` binds request information. The application + context is also implicitly created if a request context is created + but the application is not on top of the individual application + context. + """ + + def __init__(self, app): + self.app = app + self.url_adapter = app.create_url_adapter(None) + self.g = app.app_ctx_globals_class() + + # Like request context, app contexts can be pushed multiple times + # but there a basic "refcount" is enough to track them. + self._refcnt = 0 + + def push(self): + """Binds the app context to the current context.""" + self._refcnt += 1 + if hasattr(sys, 'exc_clear'): + sys.exc_clear() + _app_ctx_stack.push(self) + appcontext_pushed.send(self.app) + + def pop(self, exc=_sentinel): + """Pops the app context.""" + try: + self._refcnt -= 1 + if self._refcnt <= 0: + if exc is _sentinel: + exc = sys.exc_info()[1] + self.app.do_teardown_appcontext(exc) + finally: + rv = _app_ctx_stack.pop() + assert rv is self, 'Popped wrong app context. (%r instead of %r)' \ + % (rv, self) + appcontext_popped.send(self.app) + + def __enter__(self): + self.push() + return self + + def __exit__(self, exc_type, exc_value, tb): + self.pop(exc_value) + + if BROKEN_PYPY_CTXMGR_EXIT and exc_type is not None: + reraise(exc_type, exc_value, tb) + + +class RequestContext(object): + """The request context contains all request relevant information. It is + created at the beginning of the request and pushed to the + `_request_ctx_stack` and removed at the end of it. It will create the + URL adapter and request object for the WSGI environment provided. + + Do not attempt to use this class directly, instead use + :meth:`~flask.Flask.test_request_context` and + :meth:`~flask.Flask.request_context` to create this object. + + When the request context is popped, it will evaluate all the + functions registered on the application for teardown execution + (:meth:`~flask.Flask.teardown_request`). + + The request context is automatically popped at the end of the request + for you. In debug mode the request context is kept around if + exceptions happen so that interactive debuggers have a chance to + introspect the data. With 0.4 this can also be forced for requests + that did not fail and outside of ``DEBUG`` mode. By setting + ``'flask._preserve_context'`` to ``True`` on the WSGI environment the + context will not pop itself at the end of the request. This is used by + the :meth:`~flask.Flask.test_client` for example to implement the + deferred cleanup functionality. + + You might find this helpful for unittests where you need the + information from the context local around for a little longer. Make + sure to properly :meth:`~werkzeug.LocalStack.pop` the stack yourself in + that situation, otherwise your unittests will leak memory. + """ + + def __init__(self, app, environ, request=None): + self.app = app + if request is None: + request = app.request_class(environ) + self.request = request + self.url_adapter = app.create_url_adapter(self.request) + self.flashes = None + self.session = None + + # Request contexts can be pushed multiple times and interleaved with + # other request contexts. Now only if the last level is popped we + # get rid of them. Additionally if an application context is missing + # one is created implicitly so for each level we add this information + self._implicit_app_ctx_stack = [] + + # indicator if the context was preserved. Next time another context + # is pushed the preserved context is popped. + self.preserved = False + + # remembers the exception for pop if there is one in case the context + # preservation kicks in. + self._preserved_exc = None + + # Functions that should be executed after the request on the response + # object. These will be called before the regular "after_request" + # functions. + self._after_request_functions = [] + + self.match_request() + + def _get_g(self): + return _app_ctx_stack.top.g + def _set_g(self, value): + _app_ctx_stack.top.g = value + g = property(_get_g, _set_g) + del _get_g, _set_g + + def copy(self): + """Creates a copy of this request context with the same request object. + This can be used to move a request context to a different greenlet. + Because the actual request object is the same this cannot be used to + move a request context to a different thread unless access to the + request object is locked. + + .. versionadded:: 0.10 + """ + return self.__class__(self.app, + environ=self.request.environ, + request=self.request + ) + + def match_request(self): + """Can be overridden by a subclass to hook into the matching + of the request. + """ + try: + url_rule, self.request.view_args = \ + self.url_adapter.match(return_rule=True) + self.request.url_rule = url_rule + except HTTPException as e: + self.request.routing_exception = e + + def push(self): + """Binds the request context to the current context.""" + # If an exception occurs in debug mode or if context preservation is + # activated under exception situations exactly one context stays + # on the stack. The rationale is that you want to access that + # information under debug situations. However if someone forgets to + # pop that context again we want to make sure that on the next push + # it's invalidated, otherwise we run at risk that something leaks + # memory. This is usually only a problem in test suite since this + # functionality is not active in production environments. + top = _request_ctx_stack.top + if top is not None and top.preserved: + top.pop(top._preserved_exc) + + # Before we push the request context we have to ensure that there + # is an application context. + app_ctx = _app_ctx_stack.top + if app_ctx is None or app_ctx.app != self.app: + app_ctx = self.app.app_context() + app_ctx.push() + self._implicit_app_ctx_stack.append(app_ctx) + else: + self._implicit_app_ctx_stack.append(None) + + if hasattr(sys, 'exc_clear'): + sys.exc_clear() + + _request_ctx_stack.push(self) + + # Open the session at the moment that the request context is available. + # This allows a custom open_session method to use the request context. + # Only open a new session if this is the first time the request was + # pushed, otherwise stream_with_context loses the session. + if self.session is None: + session_interface = self.app.session_interface + self.session = session_interface.open_session( + self.app, self.request + ) + + if self.session is None: + self.session = session_interface.make_null_session(self.app) + + def pop(self, exc=_sentinel): + """Pops the request context and unbinds it by doing that. This will + also trigger the execution of functions registered by the + :meth:`~flask.Flask.teardown_request` decorator. + + .. versionchanged:: 0.9 + Added the `exc` argument. + """ + app_ctx = self._implicit_app_ctx_stack.pop() + + try: + clear_request = False + if not self._implicit_app_ctx_stack: + self.preserved = False + self._preserved_exc = None + if exc is _sentinel: + exc = sys.exc_info()[1] + self.app.do_teardown_request(exc) + + # If this interpreter supports clearing the exception information + # we do that now. This will only go into effect on Python 2.x, + # on 3.x it disappears automatically at the end of the exception + # stack. + if hasattr(sys, 'exc_clear'): + sys.exc_clear() + + request_close = getattr(self.request, 'close', None) + if request_close is not None: + request_close() + clear_request = True + finally: + rv = _request_ctx_stack.pop() + + # get rid of circular dependencies at the end of the request + # so that we don't require the GC to be active. + if clear_request: + rv.request.environ['werkzeug.request'] = None + + # Get rid of the app as well if necessary. + if app_ctx is not None: + app_ctx.pop(exc) + + assert rv is self, 'Popped wrong request context. ' \ + '(%r instead of %r)' % (rv, self) + + def auto_pop(self, exc): + if self.request.environ.get('flask._preserve_context') or \ + (exc is not None and self.app.preserve_context_on_exception): + self.preserved = True + self._preserved_exc = exc + else: + self.pop(exc) + + def __enter__(self): + self.push() + return self + + def __exit__(self, exc_type, exc_value, tb): + # do not pop the request stack if we are in debug mode and an + # exception happened. This will allow the debugger to still + # access the request object in the interactive shell. Furthermore + # the context can be force kept alive for the test client. + # See flask.testing for how this works. + self.auto_pop(exc_value) + + if BROKEN_PYPY_CTXMGR_EXIT and exc_type is not None: + reraise(exc_type, exc_value, tb) + + def __repr__(self): + return '<%s \'%s\' [%s] of %s>' % ( + self.__class__.__name__, + self.request.url, + self.request.method, + self.app.name, + ) diff --git a/venv/lib/python3.7/site-packages/flask/debughelpers.py b/venv/lib/python3.7/site-packages/flask/debughelpers.py new file mode 100644 index 0000000..e9765f2 --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/debughelpers.py @@ -0,0 +1,168 @@ +# -*- coding: utf-8 -*- +""" + flask.debughelpers + ~~~~~~~~~~~~~~~~~~ + + Various helpers to make the development experience better. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +import os +from warnings import warn + +from ._compat import implements_to_string, text_type +from .app import Flask +from .blueprints import Blueprint +from .globals import _request_ctx_stack + + +class UnexpectedUnicodeError(AssertionError, UnicodeError): + """Raised in places where we want some better error reporting for + unexpected unicode or binary data. + """ + + +@implements_to_string +class DebugFilesKeyError(KeyError, AssertionError): + """Raised from request.files during debugging. The idea is that it can + provide a better error message than just a generic KeyError/BadRequest. + """ + + def __init__(self, request, key): + form_matches = request.form.getlist(key) + buf = ['You tried to access the file "%s" in the request.files ' + 'dictionary but it does not exist. The mimetype for the request ' + 'is "%s" instead of "multipart/form-data" which means that no ' + 'file contents were transmitted. To fix this error you should ' + 'provide enctype="multipart/form-data" in your form.' % + (key, request.mimetype)] + if form_matches: + buf.append('\n\nThe browser instead transmitted some file names. ' + 'This was submitted: %s' % ', '.join('"%s"' % x + for x in form_matches)) + self.msg = ''.join(buf) + + def __str__(self): + return self.msg + + +class FormDataRoutingRedirect(AssertionError): + """This exception is raised by Flask in debug mode if it detects a + redirect caused by the routing system when the request method is not + GET, HEAD or OPTIONS. Reasoning: form data will be dropped. + """ + + def __init__(self, request): + exc = request.routing_exception + buf = ['A request was sent to this URL (%s) but a redirect was ' + 'issued automatically by the routing system to "%s".' + % (request.url, exc.new_url)] + + # In case just a slash was appended we can be extra helpful + if request.base_url + '/' == exc.new_url.split('?')[0]: + buf.append(' The URL was defined with a trailing slash so ' + 'Flask will automatically redirect to the URL ' + 'with the trailing slash if it was accessed ' + 'without one.') + + buf.append(' Make sure to directly send your %s-request to this URL ' + 'since we can\'t make browsers or HTTP clients redirect ' + 'with form data reliably or without user interaction.' % + request.method) + buf.append('\n\nNote: this exception is only raised in debug mode') + AssertionError.__init__(self, ''.join(buf).encode('utf-8')) + + +def attach_enctype_error_multidict(request): + """Since Flask 0.8 we're monkeypatching the files object in case a + request is detected that does not use multipart form data but the files + object is accessed. + """ + oldcls = request.files.__class__ + class newcls(oldcls): + def __getitem__(self, key): + try: + return oldcls.__getitem__(self, key) + except KeyError: + if key not in request.form: + raise + raise DebugFilesKeyError(request, key) + newcls.__name__ = oldcls.__name__ + newcls.__module__ = oldcls.__module__ + request.files.__class__ = newcls + + +def _dump_loader_info(loader): + yield 'class: %s.%s' % (type(loader).__module__, type(loader).__name__) + for key, value in sorted(loader.__dict__.items()): + if key.startswith('_'): + continue + if isinstance(value, (tuple, list)): + if not all(isinstance(x, (str, text_type)) for x in value): + continue + yield '%s:' % key + for item in value: + yield ' - %s' % item + continue + elif not isinstance(value, (str, text_type, int, float, bool)): + continue + yield '%s: %r' % (key, value) + + +def explain_template_loading_attempts(app, template, attempts): + """This should help developers understand what failed""" + info = ['Locating template "%s":' % template] + total_found = 0 + blueprint = None + reqctx = _request_ctx_stack.top + if reqctx is not None and reqctx.request.blueprint is not None: + blueprint = reqctx.request.blueprint + + for idx, (loader, srcobj, triple) in enumerate(attempts): + if isinstance(srcobj, Flask): + src_info = 'application "%s"' % srcobj.import_name + elif isinstance(srcobj, Blueprint): + src_info = 'blueprint "%s" (%s)' % (srcobj.name, + srcobj.import_name) + else: + src_info = repr(srcobj) + + info.append('% 5d: trying loader of %s' % ( + idx + 1, src_info)) + + for line in _dump_loader_info(loader): + info.append(' %s' % line) + + if triple is None: + detail = 'no match' + else: + detail = 'found (%r)' % (triple[1] or '') + total_found += 1 + info.append(' -> %s' % detail) + + seems_fishy = False + if total_found == 0: + info.append('Error: the template could not be found.') + seems_fishy = True + elif total_found > 1: + info.append('Warning: multiple loaders returned a match for the template.') + seems_fishy = True + + if blueprint is not None and seems_fishy: + info.append(' The template was looked up from an endpoint that ' + 'belongs to the blueprint "%s".' % blueprint) + info.append(' Maybe you did not place a template in the right folder?') + info.append(' See http://flask.pocoo.org/docs/blueprints/#templates') + + app.logger.info('\n'.join(info)) + + +def explain_ignored_app_run(): + if os.environ.get('WERKZEUG_RUN_MAIN') != 'true': + warn(Warning('Silently ignoring app.run() because the ' + 'application is run from the flask command line ' + 'executable. Consider putting app.run() behind an ' + 'if __name__ == "__main__" guard to silence this ' + 'warning.'), stacklevel=3) diff --git a/venv/lib/python3.7/site-packages/flask/globals.py b/venv/lib/python3.7/site-packages/flask/globals.py new file mode 100644 index 0000000..7d50a6f --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/globals.py @@ -0,0 +1,61 @@ +# -*- coding: utf-8 -*- +""" + flask.globals + ~~~~~~~~~~~~~ + + Defines all the global objects that are proxies to the current + active context. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +from functools import partial +from werkzeug.local import LocalStack, LocalProxy + + +_request_ctx_err_msg = '''\ +Working outside of request context. + +This typically means that you attempted to use functionality that needed +an active HTTP request. Consult the documentation on testing for +information about how to avoid this problem.\ +''' +_app_ctx_err_msg = '''\ +Working outside of application context. + +This typically means that you attempted to use functionality that needed +to interface with the current application object in some way. To solve +this, set up an application context with app.app_context(). See the +documentation for more information.\ +''' + + +def _lookup_req_object(name): + top = _request_ctx_stack.top + if top is None: + raise RuntimeError(_request_ctx_err_msg) + return getattr(top, name) + + +def _lookup_app_object(name): + top = _app_ctx_stack.top + if top is None: + raise RuntimeError(_app_ctx_err_msg) + return getattr(top, name) + + +def _find_app(): + top = _app_ctx_stack.top + if top is None: + raise RuntimeError(_app_ctx_err_msg) + return top.app + + +# context locals +_request_ctx_stack = LocalStack() +_app_ctx_stack = LocalStack() +current_app = LocalProxy(_find_app) +request = LocalProxy(partial(_lookup_req_object, 'request')) +session = LocalProxy(partial(_lookup_req_object, 'session')) +g = LocalProxy(partial(_lookup_app_object, 'g')) diff --git a/venv/lib/python3.7/site-packages/flask/helpers.py b/venv/lib/python3.7/site-packages/flask/helpers.py new file mode 100644 index 0000000..158edc5 --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/helpers.py @@ -0,0 +1,1051 @@ +# -*- coding: utf-8 -*- +""" + flask.helpers + ~~~~~~~~~~~~~ + + Implements various helpers. + + :copyright: © 2010 by the Pallets team. + :license: BSD, see LICENSE for more details. +""" + +import os +import socket +import sys +import pkgutil +import posixpath +import mimetypes +from time import time +from zlib import adler32 +from threading import RLock +import unicodedata +from werkzeug.routing import BuildError +from functools import update_wrapper + +from werkzeug.urls import url_quote +from werkzeug.datastructures import Headers, Range +from werkzeug.exceptions import BadRequest, NotFound, \ + RequestedRangeNotSatisfiable + +from werkzeug.wsgi import wrap_file +from jinja2 import FileSystemLoader + +from .signals import message_flashed +from .globals import session, _request_ctx_stack, _app_ctx_stack, \ + current_app, request +from ._compat import string_types, text_type, PY2 + +# sentinel +_missing = object() + + +# what separators does this operating system provide that are not a slash? +# this is used by the send_from_directory function to ensure that nobody is +# able to access files from outside the filesystem. +_os_alt_seps = list(sep for sep in [os.path.sep, os.path.altsep] + if sep not in (None, '/')) + + +def get_env(): + """Get the environment the app is running in, indicated by the + :envvar:`FLASK_ENV` environment variable. The default is + ``'production'``. + """ + return os.environ.get('FLASK_ENV') or 'production' + + +def get_debug_flag(): + """Get whether debug mode should be enabled for the app, indicated + by the :envvar:`FLASK_DEBUG` environment variable. The default is + ``True`` if :func:`.get_env` returns ``'development'``, or ``False`` + otherwise. + """ + val = os.environ.get('FLASK_DEBUG') + + if not val: + return get_env() == 'development' + + return val.lower() not in ('0', 'false', 'no') + + +def get_load_dotenv(default=True): + """Get whether the user has disabled loading dotenv files by setting + :envvar:`FLASK_SKIP_DOTENV`. The default is ``True``, load the + files. + + :param default: What to return if the env var isn't set. + """ + val = os.environ.get('FLASK_SKIP_DOTENV') + + if not val: + return default + + return val.lower() in ('0', 'false', 'no') + + +def _endpoint_from_view_func(view_func): + """Internal helper that returns the default endpoint for a given + function. This always is the function name. + """ + assert view_func is not None, 'expected view func if endpoint ' \ + 'is not provided.' + return view_func.__name__ + + +def stream_with_context(generator_or_function): + """Request contexts disappear when the response is started on the server. + This is done for efficiency reasons and to make it less likely to encounter + memory leaks with badly written WSGI middlewares. The downside is that if + you are using streamed responses, the generator cannot access request bound + information any more. + + This function however can help you keep the context around for longer:: + + from flask import stream_with_context, request, Response + + @app.route('/stream') + def streamed_response(): + @stream_with_context + def generate(): + yield 'Hello ' + yield request.args['name'] + yield '!' + return Response(generate()) + + Alternatively it can also be used around a specific generator:: + + from flask import stream_with_context, request, Response + + @app.route('/stream') + def streamed_response(): + def generate(): + yield 'Hello ' + yield request.args['name'] + yield '!' + return Response(stream_with_context(generate())) + + .. versionadded:: 0.9 + """ + try: + gen = iter(generator_or_function) + except TypeError: + def decorator(*args, **kwargs): + gen = generator_or_function(*args, **kwargs) + return stream_with_context(gen) + return update_wrapper(decorator, generator_or_function) + + def generator(): + ctx = _request_ctx_stack.top + if ctx is None: + raise RuntimeError('Attempted to stream with context but ' + 'there was no context in the first place to keep around.') + with ctx: + # Dummy sentinel. Has to be inside the context block or we're + # not actually keeping the context around. + yield None + + # The try/finally is here so that if someone passes a WSGI level + # iterator in we're still running the cleanup logic. Generators + # don't need that because they are closed on their destruction + # automatically. + try: + for item in gen: + yield item + finally: + if hasattr(gen, 'close'): + gen.close() + + # The trick is to start the generator. Then the code execution runs until + # the first dummy None is yielded at which point the context was already + # pushed. This item is discarded. Then when the iteration continues the + # real generator is executed. + wrapped_g = generator() + next(wrapped_g) + return wrapped_g + + +def make_response(*args): + """Sometimes it is necessary to set additional headers in a view. Because + views do not have to return response objects but can return a value that + is converted into a response object by Flask itself, it becomes tricky to + add headers to it. This function can be called instead of using a return + and you will get a response object which you can use to attach headers. + + If view looked like this and you want to add a new header:: + + def index(): + return render_template('index.html', foo=42) + + You can now do something like this:: + + def index(): + response = make_response(render_template('index.html', foo=42)) + response.headers['X-Parachutes'] = 'parachutes are cool' + return response + + This function accepts the very same arguments you can return from a + view function. This for example creates a response with a 404 error + code:: + + response = make_response(render_template('not_found.html'), 404) + + The other use case of this function is to force the return value of a + view function into a response which is helpful with view + decorators:: + + response = make_response(view_function()) + response.headers['X-Parachutes'] = 'parachutes are cool' + + Internally this function does the following things: + + - if no arguments are passed, it creates a new response argument + - if one argument is passed, :meth:`flask.Flask.make_response` + is invoked with it. + - if more than one argument is passed, the arguments are passed + to the :meth:`flask.Flask.make_response` function as tuple. + + .. versionadded:: 0.6 + """ + if not args: + return current_app.response_class() + if len(args) == 1: + args = args[0] + return current_app.make_response(args) + + +def url_for(endpoint, **values): + """Generates a URL to the given endpoint with the method provided. + + Variable arguments that are unknown to the target endpoint are appended + to the generated URL as query arguments. If the value of a query argument + is ``None``, the whole pair is skipped. In case blueprints are active + you can shortcut references to the same blueprint by prefixing the + local endpoint with a dot (``.``). + + This will reference the index function local to the current blueprint:: + + url_for('.index') + + For more information, head over to the :ref:`Quickstart `. + + To integrate applications, :class:`Flask` has a hook to intercept URL build + errors through :attr:`Flask.url_build_error_handlers`. The `url_for` + function results in a :exc:`~werkzeug.routing.BuildError` when the current + app does not have a URL for the given endpoint and values. When it does, the + :data:`~flask.current_app` calls its :attr:`~Flask.url_build_error_handlers` if + it is not ``None``, which can return a string to use as the result of + `url_for` (instead of `url_for`'s default to raise the + :exc:`~werkzeug.routing.BuildError` exception) or re-raise the exception. + An example:: + + def external_url_handler(error, endpoint, values): + "Looks up an external URL when `url_for` cannot build a URL." + # This is an example of hooking the build_error_handler. + # Here, lookup_url is some utility function you've built + # which looks up the endpoint in some external URL registry. + url = lookup_url(endpoint, **values) + if url is None: + # External lookup did not have a URL. + # Re-raise the BuildError, in context of original traceback. + exc_type, exc_value, tb = sys.exc_info() + if exc_value is error: + raise exc_type, exc_value, tb + else: + raise error + # url_for will use this result, instead of raising BuildError. + return url + + app.url_build_error_handlers.append(external_url_handler) + + Here, `error` is the instance of :exc:`~werkzeug.routing.BuildError`, and + `endpoint` and `values` are the arguments passed into `url_for`. Note + that this is for building URLs outside the current application, and not for + handling 404 NotFound errors. + + .. versionadded:: 0.10 + The `_scheme` parameter was added. + + .. versionadded:: 0.9 + The `_anchor` and `_method` parameters were added. + + .. versionadded:: 0.9 + Calls :meth:`Flask.handle_build_error` on + :exc:`~werkzeug.routing.BuildError`. + + :param endpoint: the endpoint of the URL (name of the function) + :param values: the variable arguments of the URL rule + :param _external: if set to ``True``, an absolute URL is generated. Server + address can be changed via ``SERVER_NAME`` configuration variable which + falls back to the `Host` header, then to the IP and port of the request. + :param _scheme: a string specifying the desired URL scheme. The `_external` + parameter must be set to ``True`` or a :exc:`ValueError` is raised. The default + behavior uses the same scheme as the current request, or + ``PREFERRED_URL_SCHEME`` from the :ref:`app configuration ` if no + request context is available. As of Werkzeug 0.10, this also can be set + to an empty string to build protocol-relative URLs. + :param _anchor: if provided this is added as anchor to the URL. + :param _method: if provided this explicitly specifies an HTTP method. + """ + appctx = _app_ctx_stack.top + reqctx = _request_ctx_stack.top + + if appctx is None: + raise RuntimeError( + 'Attempted to generate a URL without the application context being' + ' pushed. This has to be executed when application context is' + ' available.' + ) + + # If request specific information is available we have some extra + # features that support "relative" URLs. + if reqctx is not None: + url_adapter = reqctx.url_adapter + blueprint_name = request.blueprint + + if endpoint[:1] == '.': + if blueprint_name is not None: + endpoint = blueprint_name + endpoint + else: + endpoint = endpoint[1:] + + external = values.pop('_external', False) + + # Otherwise go with the url adapter from the appctx and make + # the URLs external by default. + else: + url_adapter = appctx.url_adapter + + if url_adapter is None: + raise RuntimeError( + 'Application was not able to create a URL adapter for request' + ' independent URL generation. You might be able to fix this by' + ' setting the SERVER_NAME config variable.' + ) + + external = values.pop('_external', True) + + anchor = values.pop('_anchor', None) + method = values.pop('_method', None) + scheme = values.pop('_scheme', None) + appctx.app.inject_url_defaults(endpoint, values) + + # This is not the best way to deal with this but currently the + # underlying Werkzeug router does not support overriding the scheme on + # a per build call basis. + old_scheme = None + if scheme is not None: + if not external: + raise ValueError('When specifying _scheme, _external must be True') + old_scheme = url_adapter.url_scheme + url_adapter.url_scheme = scheme + + try: + try: + rv = url_adapter.build(endpoint, values, method=method, + force_external=external) + finally: + if old_scheme is not None: + url_adapter.url_scheme = old_scheme + except BuildError as error: + # We need to inject the values again so that the app callback can + # deal with that sort of stuff. + values['_external'] = external + values['_anchor'] = anchor + values['_method'] = method + values['_scheme'] = scheme + return appctx.app.handle_url_build_error(error, endpoint, values) + + if anchor is not None: + rv += '#' + url_quote(anchor) + return rv + + +def get_template_attribute(template_name, attribute): + """Loads a macro (or variable) a template exports. This can be used to + invoke a macro from within Python code. If you for example have a + template named :file:`_cider.html` with the following contents: + + .. sourcecode:: html+jinja + + {% macro hello(name) %}Hello {{ name }}!{% endmacro %} + + You can access this from Python code like this:: + + hello = get_template_attribute('_cider.html', 'hello') + return hello('World') + + .. versionadded:: 0.2 + + :param template_name: the name of the template + :param attribute: the name of the variable of macro to access + """ + return getattr(current_app.jinja_env.get_template(template_name).module, + attribute) + + +def flash(message, category='message'): + """Flashes a message to the next request. In order to remove the + flashed message from the session and to display it to the user, + the template has to call :func:`get_flashed_messages`. + + .. versionchanged:: 0.3 + `category` parameter added. + + :param message: the message to be flashed. + :param category: the category for the message. The following values + are recommended: ``'message'`` for any kind of message, + ``'error'`` for errors, ``'info'`` for information + messages and ``'warning'`` for warnings. However any + kind of string can be used as category. + """ + # Original implementation: + # + # session.setdefault('_flashes', []).append((category, message)) + # + # This assumed that changes made to mutable structures in the session are + # always in sync with the session object, which is not true for session + # implementations that use external storage for keeping their keys/values. + flashes = session.get('_flashes', []) + flashes.append((category, message)) + session['_flashes'] = flashes + message_flashed.send(current_app._get_current_object(), + message=message, category=category) + + +def get_flashed_messages(with_categories=False, category_filter=[]): + """Pulls all flashed messages from the session and returns them. + Further calls in the same request to the function will return + the same messages. By default just the messages are returned, + but when `with_categories` is set to ``True``, the return value will + be a list of tuples in the form ``(category, message)`` instead. + + Filter the flashed messages to one or more categories by providing those + categories in `category_filter`. This allows rendering categories in + separate html blocks. The `with_categories` and `category_filter` + arguments are distinct: + + * `with_categories` controls whether categories are returned with message + text (``True`` gives a tuple, where ``False`` gives just the message text). + * `category_filter` filters the messages down to only those matching the + provided categories. + + See :ref:`message-flashing-pattern` for examples. + + .. versionchanged:: 0.3 + `with_categories` parameter added. + + .. versionchanged:: 0.9 + `category_filter` parameter added. + + :param with_categories: set to ``True`` to also receive categories. + :param category_filter: whitelist of categories to limit return values + """ + flashes = _request_ctx_stack.top.flashes + if flashes is None: + _request_ctx_stack.top.flashes = flashes = session.pop('_flashes') \ + if '_flashes' in session else [] + if category_filter: + flashes = list(filter(lambda f: f[0] in category_filter, flashes)) + if not with_categories: + return [x[1] for x in flashes] + return flashes + + +def send_file(filename_or_fp, mimetype=None, as_attachment=False, + attachment_filename=None, add_etags=True, + cache_timeout=None, conditional=False, last_modified=None): + """Sends the contents of a file to the client. This will use the + most efficient method available and configured. By default it will + try to use the WSGI server's file_wrapper support. Alternatively + you can set the application's :attr:`~Flask.use_x_sendfile` attribute + to ``True`` to directly emit an ``X-Sendfile`` header. This however + requires support of the underlying webserver for ``X-Sendfile``. + + By default it will try to guess the mimetype for you, but you can + also explicitly provide one. For extra security you probably want + to send certain files as attachment (HTML for instance). The mimetype + guessing requires a `filename` or an `attachment_filename` to be + provided. + + ETags will also be attached automatically if a `filename` is provided. You + can turn this off by setting `add_etags=False`. + + If `conditional=True` and `filename` is provided, this method will try to + upgrade the response stream to support range requests. This will allow + the request to be answered with partial content response. + + Please never pass filenames to this function from user sources; + you should use :func:`send_from_directory` instead. + + .. versionadded:: 0.2 + + .. versionadded:: 0.5 + The `add_etags`, `cache_timeout` and `conditional` parameters were + added. The default behavior is now to attach etags. + + .. versionchanged:: 0.7 + mimetype guessing and etag support for file objects was + deprecated because it was unreliable. Pass a filename if you are + able to, otherwise attach an etag yourself. This functionality + will be removed in Flask 1.0 + + .. versionchanged:: 0.9 + cache_timeout pulls its default from application config, when None. + + .. versionchanged:: 0.12 + The filename is no longer automatically inferred from file objects. If + you want to use automatic mimetype and etag support, pass a filepath via + `filename_or_fp` or `attachment_filename`. + + .. versionchanged:: 0.12 + The `attachment_filename` is preferred over `filename` for MIME-type + detection. + + .. versionchanged:: 1.0 + UTF-8 filenames, as specified in `RFC 2231`_, are supported. + + .. _RFC 2231: https://tools.ietf.org/html/rfc2231#section-4 + + .. versionchanged:: 1.0.3 + Filenames are encoded with ASCII instead of Latin-1 for broader + compatibility with WSGI servers. + + :param filename_or_fp: the filename of the file to send. + This is relative to the :attr:`~Flask.root_path` + if a relative path is specified. + Alternatively a file object might be provided in + which case ``X-Sendfile`` might not work and fall + back to the traditional method. Make sure that the + file pointer is positioned at the start of data to + send before calling :func:`send_file`. + :param mimetype: the mimetype of the file if provided. If a file path is + given, auto detection happens as fallback, otherwise an + error will be raised. + :param as_attachment: set to ``True`` if you want to send this file with + a ``Content-Disposition: attachment`` header. + :param attachment_filename: the filename for the attachment if it + differs from the file's filename. + :param add_etags: set to ``False`` to disable attaching of etags. + :param conditional: set to ``True`` to enable conditional responses. + + :param cache_timeout: the timeout in seconds for the headers. When ``None`` + (default), this value is set by + :meth:`~Flask.get_send_file_max_age` of + :data:`~flask.current_app`. + :param last_modified: set the ``Last-Modified`` header to this value, + a :class:`~datetime.datetime` or timestamp. + If a file was passed, this overrides its mtime. + """ + mtime = None + fsize = None + if isinstance(filename_or_fp, string_types): + filename = filename_or_fp + if not os.path.isabs(filename): + filename = os.path.join(current_app.root_path, filename) + file = None + if attachment_filename is None: + attachment_filename = os.path.basename(filename) + else: + file = filename_or_fp + filename = None + + if mimetype is None: + if attachment_filename is not None: + mimetype = mimetypes.guess_type(attachment_filename)[0] \ + or 'application/octet-stream' + + if mimetype is None: + raise ValueError( + 'Unable to infer MIME-type because no filename is available. ' + 'Please set either `attachment_filename`, pass a filepath to ' + '`filename_or_fp` or set your own MIME-type via `mimetype`.' + ) + + headers = Headers() + if as_attachment: + if attachment_filename is None: + raise TypeError('filename unavailable, required for ' + 'sending as attachment') + + if not isinstance(attachment_filename, text_type): + attachment_filename = attachment_filename.decode('utf-8') + + try: + attachment_filename = attachment_filename.encode('ascii') + except UnicodeEncodeError: + filenames = { + 'filename': unicodedata.normalize( + 'NFKD', attachment_filename).encode('ascii', 'ignore'), + 'filename*': "UTF-8''%s" % url_quote(attachment_filename), + } + else: + filenames = {'filename': attachment_filename} + + headers.add('Content-Disposition', 'attachment', **filenames) + + if current_app.use_x_sendfile and filename: + if file is not None: + file.close() + headers['X-Sendfile'] = filename + fsize = os.path.getsize(filename) + headers['Content-Length'] = fsize + data = None + else: + if file is None: + file = open(filename, 'rb') + mtime = os.path.getmtime(filename) + fsize = os.path.getsize(filename) + headers['Content-Length'] = fsize + data = wrap_file(request.environ, file) + + rv = current_app.response_class(data, mimetype=mimetype, headers=headers, + direct_passthrough=True) + + if last_modified is not None: + rv.last_modified = last_modified + elif mtime is not None: + rv.last_modified = mtime + + rv.cache_control.public = True + if cache_timeout is None: + cache_timeout = current_app.get_send_file_max_age(filename) + if cache_timeout is not None: + rv.cache_control.max_age = cache_timeout + rv.expires = int(time() + cache_timeout) + + if add_etags and filename is not None: + from warnings import warn + + try: + rv.set_etag('%s-%s-%s' % ( + os.path.getmtime(filename), + os.path.getsize(filename), + adler32( + filename.encode('utf-8') if isinstance(filename, text_type) + else filename + ) & 0xffffffff + )) + except OSError: + warn('Access %s failed, maybe it does not exist, so ignore etags in ' + 'headers' % filename, stacklevel=2) + + if conditional: + try: + rv = rv.make_conditional(request, accept_ranges=True, + complete_length=fsize) + except RequestedRangeNotSatisfiable: + if file is not None: + file.close() + raise + # make sure we don't send x-sendfile for servers that + # ignore the 304 status code for x-sendfile. + if rv.status_code == 304: + rv.headers.pop('x-sendfile', None) + return rv + + +def safe_join(directory, *pathnames): + """Safely join `directory` and zero or more untrusted `pathnames` + components. + + Example usage:: + + @app.route('/wiki/') + def wiki_page(filename): + filename = safe_join(app.config['WIKI_FOLDER'], filename) + with open(filename, 'rb') as fd: + content = fd.read() # Read and process the file content... + + :param directory: the trusted base directory. + :param pathnames: the untrusted pathnames relative to that directory. + :raises: :class:`~werkzeug.exceptions.NotFound` if one or more passed + paths fall out of its boundaries. + """ + + parts = [directory] + + for filename in pathnames: + if filename != '': + filename = posixpath.normpath(filename) + + if ( + any(sep in filename for sep in _os_alt_seps) + or os.path.isabs(filename) + or filename == '..' + or filename.startswith('../') + ): + raise NotFound() + + parts.append(filename) + + return posixpath.join(*parts) + + +def send_from_directory(directory, filename, **options): + """Send a file from a given directory with :func:`send_file`. This + is a secure way to quickly expose static files from an upload folder + or something similar. + + Example usage:: + + @app.route('/uploads/') + def download_file(filename): + return send_from_directory(app.config['UPLOAD_FOLDER'], + filename, as_attachment=True) + + .. admonition:: Sending files and Performance + + It is strongly recommended to activate either ``X-Sendfile`` support in + your webserver or (if no authentication happens) to tell the webserver + to serve files for the given path on its own without calling into the + web application for improved performance. + + .. versionadded:: 0.5 + + :param directory: the directory where all the files are stored. + :param filename: the filename relative to that directory to + download. + :param options: optional keyword arguments that are directly + forwarded to :func:`send_file`. + """ + filename = safe_join(directory, filename) + if not os.path.isabs(filename): + filename = os.path.join(current_app.root_path, filename) + try: + if not os.path.isfile(filename): + raise NotFound() + except (TypeError, ValueError): + raise BadRequest() + options.setdefault('conditional', True) + return send_file(filename, **options) + + +def get_root_path(import_name): + """Returns the path to a package or cwd if that cannot be found. This + returns the path of a package or the folder that contains a module. + + Not to be confused with the package path returned by :func:`find_package`. + """ + # Module already imported and has a file attribute. Use that first. + mod = sys.modules.get(import_name) + if mod is not None and hasattr(mod, '__file__'): + return os.path.dirname(os.path.abspath(mod.__file__)) + + # Next attempt: check the loader. + loader = pkgutil.get_loader(import_name) + + # Loader does not exist or we're referring to an unloaded main module + # or a main module without path (interactive sessions), go with the + # current working directory. + if loader is None or import_name == '__main__': + return os.getcwd() + + # For .egg, zipimporter does not have get_filename until Python 2.7. + # Some other loaders might exhibit the same behavior. + if hasattr(loader, 'get_filename'): + filepath = loader.get_filename(import_name) + else: + # Fall back to imports. + __import__(import_name) + mod = sys.modules[import_name] + filepath = getattr(mod, '__file__', None) + + # If we don't have a filepath it might be because we are a + # namespace package. In this case we pick the root path from the + # first module that is contained in our package. + if filepath is None: + raise RuntimeError('No root path can be found for the provided ' + 'module "%s". This can happen because the ' + 'module came from an import hook that does ' + 'not provide file name information or because ' + 'it\'s a namespace package. In this case ' + 'the root path needs to be explicitly ' + 'provided.' % import_name) + + # filepath is import_name.py for a module, or __init__.py for a package. + return os.path.dirname(os.path.abspath(filepath)) + + +def _matching_loader_thinks_module_is_package(loader, mod_name): + """Given the loader that loaded a module and the module this function + attempts to figure out if the given module is actually a package. + """ + # If the loader can tell us if something is a package, we can + # directly ask the loader. + if hasattr(loader, 'is_package'): + return loader.is_package(mod_name) + # importlib's namespace loaders do not have this functionality but + # all the modules it loads are packages, so we can take advantage of + # this information. + elif (loader.__class__.__module__ == '_frozen_importlib' and + loader.__class__.__name__ == 'NamespaceLoader'): + return True + # Otherwise we need to fail with an error that explains what went + # wrong. + raise AttributeError( + ('%s.is_package() method is missing but is required by Flask of ' + 'PEP 302 import hooks. If you do not use import hooks and ' + 'you encounter this error please file a bug against Flask.') % + loader.__class__.__name__) + + +def find_package(import_name): + """Finds a package and returns the prefix (or None if the package is + not installed) as well as the folder that contains the package or + module as a tuple. The package path returned is the module that would + have to be added to the pythonpath in order to make it possible to + import the module. The prefix is the path below which a UNIX like + folder structure exists (lib, share etc.). + """ + root_mod_name = import_name.split('.')[0] + loader = pkgutil.get_loader(root_mod_name) + if loader is None or import_name == '__main__': + # import name is not found, or interactive/main module + package_path = os.getcwd() + else: + # For .egg, zipimporter does not have get_filename until Python 2.7. + if hasattr(loader, 'get_filename'): + filename = loader.get_filename(root_mod_name) + elif hasattr(loader, 'archive'): + # zipimporter's loader.archive points to the .egg or .zip + # archive filename is dropped in call to dirname below. + filename = loader.archive + else: + # At least one loader is missing both get_filename and archive: + # Google App Engine's HardenedModulesHook + # + # Fall back to imports. + __import__(import_name) + filename = sys.modules[import_name].__file__ + package_path = os.path.abspath(os.path.dirname(filename)) + + # In case the root module is a package we need to chop of the + # rightmost part. This needs to go through a helper function + # because of python 3.3 namespace packages. + if _matching_loader_thinks_module_is_package( + loader, root_mod_name): + package_path = os.path.dirname(package_path) + + site_parent, site_folder = os.path.split(package_path) + py_prefix = os.path.abspath(sys.prefix) + if package_path.startswith(py_prefix): + return py_prefix, package_path + elif site_folder.lower() == 'site-packages': + parent, folder = os.path.split(site_parent) + # Windows like installations + if folder.lower() == 'lib': + base_dir = parent + # UNIX like installations + elif os.path.basename(parent).lower() == 'lib': + base_dir = os.path.dirname(parent) + else: + base_dir = site_parent + return base_dir, package_path + return None, package_path + + +class locked_cached_property(object): + """A decorator that converts a function into a lazy property. The + function wrapped is called the first time to retrieve the result + and then that calculated result is used the next time you access + the value. Works like the one in Werkzeug but has a lock for + thread safety. + """ + + def __init__(self, func, name=None, doc=None): + self.__name__ = name or func.__name__ + self.__module__ = func.__module__ + self.__doc__ = doc or func.__doc__ + self.func = func + self.lock = RLock() + + def __get__(self, obj, type=None): + if obj is None: + return self + with self.lock: + value = obj.__dict__.get(self.__name__, _missing) + if value is _missing: + value = self.func(obj) + obj.__dict__[self.__name__] = value + return value + + +class _PackageBoundObject(object): + #: The name of the package or module that this app belongs to. Do not + #: change this once it is set by the constructor. + import_name = None + + #: Location of the template files to be added to the template lookup. + #: ``None`` if templates should not be added. + template_folder = None + + #: Absolute path to the package on the filesystem. Used to look up + #: resources contained in the package. + root_path = None + + def __init__(self, import_name, template_folder=None, root_path=None): + self.import_name = import_name + self.template_folder = template_folder + + if root_path is None: + root_path = get_root_path(self.import_name) + + self.root_path = root_path + self._static_folder = None + self._static_url_path = None + + def _get_static_folder(self): + if self._static_folder is not None: + return os.path.join(self.root_path, self._static_folder) + + def _set_static_folder(self, value): + self._static_folder = value + + static_folder = property( + _get_static_folder, _set_static_folder, + doc='The absolute path to the configured static folder.' + ) + del _get_static_folder, _set_static_folder + + def _get_static_url_path(self): + if self._static_url_path is not None: + return self._static_url_path + + if self.static_folder is not None: + return '/' + os.path.basename(self.static_folder) + + def _set_static_url_path(self, value): + self._static_url_path = value + + static_url_path = property( + _get_static_url_path, _set_static_url_path, + doc='The URL prefix that the static route will be registered for.' + ) + del _get_static_url_path, _set_static_url_path + + @property + def has_static_folder(self): + """This is ``True`` if the package bound object's container has a + folder for static files. + + .. versionadded:: 0.5 + """ + return self.static_folder is not None + + @locked_cached_property + def jinja_loader(self): + """The Jinja loader for this package bound object. + + .. versionadded:: 0.5 + """ + if self.template_folder is not None: + return FileSystemLoader(os.path.join(self.root_path, + self.template_folder)) + + def get_send_file_max_age(self, filename): + """Provides default cache_timeout for the :func:`send_file` functions. + + By default, this function returns ``SEND_FILE_MAX_AGE_DEFAULT`` from + the configuration of :data:`~flask.current_app`. + + Static file functions such as :func:`send_from_directory` use this + function, and :func:`send_file` calls this function on + :data:`~flask.current_app` when the given cache_timeout is ``None``. If a + cache_timeout is given in :func:`send_file`, that timeout is used; + otherwise, this method is called. + + This allows subclasses to change the behavior when sending files based + on the filename. For example, to set the cache timeout for .js files + to 60 seconds:: + + class MyFlask(flask.Flask): + def get_send_file_max_age(self, name): + if name.lower().endswith('.js'): + return 60 + return flask.Flask.get_send_file_max_age(self, name) + + .. versionadded:: 0.9 + """ + return total_seconds(current_app.send_file_max_age_default) + + def send_static_file(self, filename): + """Function used internally to send static files from the static + folder to the browser. + + .. versionadded:: 0.5 + """ + if not self.has_static_folder: + raise RuntimeError('No static folder for this object') + # Ensure get_send_file_max_age is called in all cases. + # Here, we ensure get_send_file_max_age is called for Blueprints. + cache_timeout = self.get_send_file_max_age(filename) + return send_from_directory(self.static_folder, filename, + cache_timeout=cache_timeout) + + def open_resource(self, resource, mode='rb'): + """Opens a resource from the application's resource folder. To see + how this works, consider the following folder structure:: + + /myapplication.py + /schema.sql + /static + /style.css + /templates + /layout.html + /index.html + + If you want to open the :file:`schema.sql` file you would do the + following:: + + with app.open_resource('schema.sql') as f: + contents = f.read() + do_something_with(contents) + + :param resource: the name of the resource. To access resources within + subfolders use forward slashes as separator. + :param mode: resource file opening mode, default is 'rb'. + """ + if mode not in ('r', 'rb'): + raise ValueError('Resources can only be opened for reading') + return open(os.path.join(self.root_path, resource), mode) + + +def total_seconds(td): + """Returns the total seconds from a timedelta object. + + :param timedelta td: the timedelta to be converted in seconds + + :returns: number of seconds + :rtype: int + """ + return td.days * 60 * 60 * 24 + td.seconds + + +def is_ip(value): + """Determine if the given string is an IP address. + + Python 2 on Windows doesn't provide ``inet_pton``, so this only + checks IPv4 addresses in that environment. + + :param value: value to check + :type value: str + + :return: True if string is an IP address + :rtype: bool + """ + if PY2 and os.name == 'nt': + try: + socket.inet_aton(value) + return True + except socket.error: + return False + + for family in (socket.AF_INET, socket.AF_INET6): + try: + socket.inet_pton(family, value) + except socket.error: + pass + else: + return True + + return False diff --git a/venv/lib/python3.7/site-packages/flask/json/__init__.py b/venv/lib/python3.7/site-packages/flask/json/__init__.py new file mode 100644 index 0000000..c24286c --- /dev/null +++ b/venv/lib/python3.7/site-packages/flask/json/__init__.py @@ -0,0 +1,357 @@ +# -*- coding: utf-8 -*- +""" +flask.json +~~~~~~~~~~ + +:copyright: © 2010 by the Pallets team. +:license: BSD, see LICENSE for more details. +""" +import codecs +import io +import uuid +from datetime import date, datetime +from flask.globals import current_app, request +from flask._compat import text_type, PY2 + +from werkzeug.http import http_date +from jinja2 import Markup + +# Use the same json implementation as itsdangerous on which we +# depend anyways. +from itsdangerous import json as _json + + +# Figure out if simplejson escapes slashes. This behavior was changed +# from one version to another without reason. +_slash_escape = '\\/' not in _json.dumps('/') + + +__all__ = ['dump', 'dumps', 'load', 'loads', 'htmlsafe_dump', + 'htmlsafe_dumps', 'JSONDecoder', 'JSONEncoder', + 'jsonify'] + + +def _wrap_reader_for_text(fp, encoding): + if isinstance(fp.read(0), bytes): + fp = io.TextIOWrapper(io.BufferedReader(fp), encoding) + return fp + + +def _wrap_writer_for_text(fp, encoding): + try: + fp.write('') + except TypeError: + fp = io.TextIOWrapper(fp, encoding) + return fp + + +class JSONEncoder(_json.JSONEncoder): + """The default Flask JSON encoder. This one extends the default simplejson + encoder by also supporting ``datetime`` objects, ``UUID`` as well as + ``Markup`` objects which are serialized as RFC 822 datetime strings (same + as the HTTP date format). In order to support more data types override the + :meth:`default` method. + """ + + def default(self, o): + """Implement this method in a subclass such that it returns a + serializable object for ``o``, or calls the base implementation (to + raise a :exc:`TypeError`). + + For example, to support arbitrary iterators, you could implement + default like this:: + + def default(self, o): + try: + iterable = iter(o) + except TypeError: + pass + else: + return list(iterable) + return JSONEncoder.default(self, o) + """ + if isinstance(o, datetime): + return http_date(o.utctimetuple()) + if isinstance(o, date): + return http_date(o.timetuple()) + if isinstance(o, uuid.UUID): + return str(o) + if hasattr(o, '__html__'): + return text_type(o.__html__()) + return _json.JSONEncoder.default(self, o) + + +class JSONDecoder(_json.JSONDecoder): + """The default JSON decoder. This one does not change the behavior from + the default simplejson decoder. Consult the :mod:`json` documentation + for more information. This decoder is not only used for the load + functions of this module but also :attr:`~flask.Request`. + """ + + +def _dump_arg_defaults(kwargs, app=None): + """Inject default arguments for dump functions.""" + if app is None: + app = current_app + + if app: + bp = app.blueprints.get(request.blueprint) if request else None + kwargs.setdefault( + 'cls', bp.json_encoder if bp and bp.json_encoder else app.json_encoder + ) + + if not app.config['JSON_AS_ASCII']: + kwargs.setdefault('ensure_ascii', False) + + kwargs.setdefault('sort_keys', app.config['JSON_SORT_KEYS']) + else: + kwargs.setdefault('sort_keys', True) + kwargs.setdefault('cls', JSONEncoder) + + +def _load_arg_defaults(kwargs, app=None): + """Inject default arguments for load functions.""" + if app is None: + app = current_app + + if app: + bp = app.blueprints.get(request.blueprint) if request else None + kwargs.setdefault( + 'cls', + bp.json_decoder if bp and bp.json_decoder + else app.json_decoder + ) + else: + kwargs.setdefault('cls', JSONDecoder) + + +def detect_encoding(data): + """Detect which UTF codec was used to encode the given bytes. + + The latest JSON standard (:rfc:`8259`) suggests that only UTF-8 is + accepted. Older documents allowed 8, 16, or 32. 16 and 32 can be big + or little endian. Some editors or libraries may prepend a BOM. + + :param data: Bytes in unknown UTF encoding. + :return: UTF encoding name + """ + head = data[:4] + + if head[:3] == codecs.BOM_UTF8: + return 'utf-8-sig' + + if b'\x00' not in head: + return 'utf-8' + + if head in (codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE): + return 'utf-32' + + if head[:2] in (codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE): + return 'utf-16' + + if len(head) == 4: + if head[:3] == b'\x00\x00\x00': + return 'utf-32-be' + + if head[::2] == b'\x00\x00': + return 'utf-16-be' + + if head[1:] == b'\x00\x00\x00': + return 'utf-32-le' + + if head[1::2] == b'\x00\x00': + return 'utf-16-le' + + if len(head) == 2: + return 'utf-16-be' if head.startswith(b'\x00') else 'utf-16-le' + + return 'utf-8' + + +def dumps(obj, app=None, **kwargs): + """Serialize ``obj`` to a JSON-formatted string. If there is an + app context pushed, use the current app's configured encoder + (:attr:`~flask.Flask.json_encoder`), or fall back to the default + :class:`JSONEncoder`. + + Takes the same arguments as the built-in :func:`json.dumps`, and + does some extra configuration based on the application. If the + simplejson package is installed, it is preferred. + + :param obj: Object to serialize to JSON. + :param app: App instance to use to configure the JSON encoder. + Uses ``current_app`` if not given, and falls back to the default + encoder when not in an app context. + :param kwargs: Extra arguments passed to :func:`json.dumps`. + + .. versionchanged:: 1.0.3 + + ``app`` can be passed directly, rather than requiring an app + context for configuration. + """ + _dump_arg_defaults(kwargs, app=app) + encoding = kwargs.pop('encoding', None) + rv = _json.dumps(obj, **kwargs) + if encoding is not None and isinstance(rv, text_type): + rv = rv.encode(encoding) + return rv + + +def dump(obj, fp, app=None, **kwargs): + """Like :func:`dumps` but writes into a file object.""" + _dump_arg_defaults(kwargs, app=app) + encoding = kwargs.pop('encoding', None) + if encoding is not None: + fp = _wrap_writer_for_text(fp, encoding) + _json.dump(obj, fp, **kwargs) + + +def loads(s, app=None, **kwargs): + """Deserialize an object from a JSON-formatted string ``s``. If + there is an app context pushed, use the current app's configured + decoder (:attr:`~flask.Flask.json_decoder`), or fall back to the + default :class:`JSONDecoder`. + + Takes the same arguments as the built-in :func:`json.loads`, and + does some extra configuration based on the application. If the + simplejson package is installed, it is preferred. + + :param s: JSON string to deserialize. + :param app: App instance to use to configure the JSON decoder. + Uses ``current_app`` if not given, and falls back to the default + encoder when not in an app context. + :param kwargs: Extra arguments passed to :func:`json.dumps`. + + .. versionchanged:: 1.0.3 + + ``app`` can be passed directly, rather than requiring an app + context for configuration. + """ + _load_arg_defaults(kwargs, app=app) + if isinstance(s, bytes): + encoding = kwargs.pop('encoding', None) + if encoding is None: + encoding = detect_encoding(s) + s = s.decode(encoding) + return _json.loads(s, **kwargs) + + +def load(fp, app=None, **kwargs): + """Like :func:`loads` but reads from a file object.""" + _load_arg_defaults(kwargs, app=app) + if not PY2: + fp = _wrap_reader_for_text(fp, kwargs.pop('encoding', None) or 'utf-8') + return _json.load(fp, **kwargs) + + +def htmlsafe_dumps(obj, **kwargs): + """Works exactly like :func:`dumps` but is safe for use in ``') + # => <script> do_nasty_stuff() </script> + # sanitize_html('Click here for $100') + # => Click here for $100 + def sanitize_token(self, token): + + # accommodate filters which use token_type differently + token_type = token["type"] + if token_type in ("StartTag", "EndTag", "EmptyTag"): + name = token["name"] + namespace = token["namespace"] + if ((namespace, name) in self.allowed_elements or + (namespace is None and + (namespaces["html"], name) in self.allowed_elements)): + return self.allowed_token(token) + else: + return self.disallowed_token(token) + elif token_type == "Comment": + pass + else: + return token + + def allowed_token(self, token): + if "data" in token: + attrs = token["data"] + attr_names = set(attrs.keys()) + + # Remove forbidden attributes + for to_remove in (attr_names - self.allowed_attributes): + del token["data"][to_remove] + attr_names.remove(to_remove) + + # Remove attributes with disallowed URL values + for attr in (attr_names & self.attr_val_is_uri): + assert attr in attrs + # I don't have a clue where this regexp comes from or why it matches those + # characters, nor why we call unescape. I just know it's always been here. + # Should you be worried by this comment in a sanitizer? Yes. On the other hand, all + # this will do is remove *more* than it otherwise would. + val_unescaped = re.sub("[`\x00-\x20\x7f-\xa0\\s]+", '', + unescape(attrs[attr])).lower() + # remove replacement characters from unescaped characters + val_unescaped = val_unescaped.replace("\ufffd", "") + try: + uri = urlparse.urlparse(val_unescaped) + except ValueError: + uri = None + del attrs[attr] + if uri and uri.scheme: + if uri.scheme not in self.allowed_protocols: + del attrs[attr] + if uri.scheme == 'data': + m = data_content_type.match(uri.path) + if not m: + del attrs[attr] + elif m.group('content_type') not in self.allowed_content_types: + del attrs[attr] + + for attr in self.svg_attr_val_allows_ref: + if attr in attrs: + attrs[attr] = re.sub(r'url\s*\(\s*[^#\s][^)]+?\)', + ' ', + unescape(attrs[attr])) + if (token["name"] in self.svg_allow_local_href and + (namespaces['xlink'], 'href') in attrs and re.search(r'^\s*[^#\s].*', + attrs[(namespaces['xlink'], 'href')])): + del attrs[(namespaces['xlink'], 'href')] + if (None, 'style') in attrs: + attrs[(None, 'style')] = self.sanitize_css(attrs[(None, 'style')]) + token["data"] = attrs + return token + + def disallowed_token(self, token): + token_type = token["type"] + if token_type == "EndTag": + token["data"] = "" % token["name"] + elif token["data"]: + assert token_type in ("StartTag", "EmptyTag") + attrs = [] + for (ns, name), v in token["data"].items(): + attrs.append(' %s="%s"' % (name if ns is None else "%s:%s" % (prefixes[ns], name), escape(v))) + token["data"] = "<%s%s>" % (token["name"], ''.join(attrs)) + else: + token["data"] = "<%s>" % token["name"] + if token.get("selfClosing"): + token["data"] = token["data"][:-1] + "/>" + + token["type"] = "Characters" + + del token["name"] + return token + + def sanitize_css(self, style): + # disallow urls + style = re.compile(r'url\s*\(\s*[^\s)]+?\s*\)\s*').sub(' ', style) + + # gauntlet + if not re.match(r"""^([:,;#%.\sa-zA-Z0-9!]|\w-\w|'[\s\w]+'|"[\s\w]+"|\([\d,\s]+\))*$""", style): + return '' + if not re.match(r"^\s*([-\w]+\s*:[^:;]*(;\s*|$))*$", style): + return '' + + clean = [] + for prop, value in re.findall(r"([-\w]+)\s*:\s*([^:;]*)", style): + if not value: + continue + if prop.lower() in self.allowed_css_properties: + clean.append(prop + ': ' + value + ';') + elif prop.split('-')[0].lower() in ['background', 'border', 'margin', + 'padding']: + for keyword in value.split(): + if keyword not in self.allowed_css_keywords and \ + not re.match(r"^(#[0-9a-fA-F]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$", keyword): # noqa + break + else: + clean.append(prop + ': ' + value + ';') + elif prop.lower() in self.allowed_svg_properties: + clean.append(prop + ': ' + value + ';') + + return ' '.join(clean) diff --git a/venv/lib/python3.7/site-packages/pip/_vendor/html5lib/filters/whitespace.py b/venv/lib/python3.7/site-packages/pip/_vendor/html5lib/filters/whitespace.py new file mode 100644 index 0000000..0d12584 --- /dev/null +++ b/venv/lib/python3.7/site-packages/pip/_vendor/html5lib/filters/whitespace.py @@ -0,0 +1,38 @@ +from __future__ import absolute_import, division, unicode_literals + +import re + +from . import base +from ..constants import rcdataElements, spaceCharacters +spaceCharacters = "".join(spaceCharacters) + +SPACES_REGEX = re.compile("[%s]+" % spaceCharacters) + + +class Filter(base.Filter): + """Collapses whitespace except in pre, textarea, and script elements""" + spacePreserveElements = frozenset(["pre", "textarea"] + list(rcdataElements)) + + def __iter__(self): + preserve = 0 + for token in base.Filter.__iter__(self): + type = token["type"] + if type == "StartTag" \ + and (preserve or token["name"] in self.spacePreserveElements): + preserve += 1 + + elif type == "EndTag" and preserve: + preserve -= 1 + + elif not preserve and type == "SpaceCharacters" and token["data"]: + # Test on token["data"] above to not introduce spaces where there were not + token["data"] = " " + + elif not preserve and type == "Characters": + token["data"] = collapse_spaces(token["data"]) + + yield token + + +def collapse_spaces(text): + return SPACES_REGEX.sub(' ', text) diff --git a/venv/lib/python3.7/site-packages/pip/_vendor/html5lib/html5parser.py b/venv/lib/python3.7/site-packages/pip/_vendor/html5lib/html5parser.py new file mode 100644 index 0000000..ae41a13 --- /dev/null +++ b/venv/lib/python3.7/site-packages/pip/_vendor/html5lib/html5parser.py @@ -0,0 +1,2791 @@ +from __future__ import absolute_import, division, unicode_literals +from pip._vendor.six import with_metaclass, viewkeys + +import types +from collections import OrderedDict + +from . import _inputstream +from . import _tokenizer + +from . import treebuilders +from .treebuilders.base import Marker + +from . import _utils +from .constants import ( + spaceCharacters, asciiUpper2Lower, + specialElements, headingElements, cdataElements, rcdataElements, + tokenTypes, tagTokenTypes, + namespaces, + htmlIntegrationPointElements, mathmlTextIntegrationPointElements, + adjustForeignAttributes as adjustForeignAttributesMap, + adjustMathMLAttributes, adjustSVGAttributes, + E, + _ReparseException +) + + +def parse(doc, treebuilder="etree", namespaceHTMLElements=True, **kwargs): + """Parse an HTML document as a string or file-like object into a tree + + :arg doc: the document to parse as a string or file-like object + + :arg treebuilder: the treebuilder to use when parsing + + :arg namespaceHTMLElements: whether or not to namespace HTML elements + + :returns: parsed tree + + Example: + + >>> from html5lib.html5parser import parse + >>> parse('

This is a doc

') + + + """ + tb = treebuilders.getTreeBuilder(treebuilder) + p = HTMLParser(tb, namespaceHTMLElements=namespaceHTMLElements) + return p.parse(doc, **kwargs) + + +def parseFragment(doc, container="div", treebuilder="etree", namespaceHTMLElements=True, **kwargs): + """Parse an HTML fragment as a string or file-like object into a tree + + :arg doc: the fragment to parse as a string or file-like object + + :arg container: the container context to parse the fragment in + + :arg treebuilder: the treebuilder to use when parsing + + :arg namespaceHTMLElements: whether or not to namespace HTML elements + + :returns: parsed tree + + Example: + + >>> from html5lib.html5libparser import parseFragment + >>> parseFragment('this is a fragment') + + + """ + tb = treebuilders.getTreeBuilder(treebuilder) + p = HTMLParser(tb, namespaceHTMLElements=namespaceHTMLElements) + return p.parseFragment(doc, container=container, **kwargs) + + +def method_decorator_metaclass(function): + class Decorated(type): + def __new__(meta, classname, bases, classDict): + for attributeName, attribute in classDict.items(): + if isinstance(attribute, types.FunctionType): + attribute = function(attribute) + + classDict[attributeName] = attribute + return type.__new__(meta, classname, bases, classDict) + return Decorated + + +class HTMLParser(object): + """HTML parser + + Generates a tree structure from a stream of (possibly malformed) HTML. + + """ + + def __init__(self, tree=None, strict=False, namespaceHTMLElements=True, debug=False): + """ + :arg tree: a treebuilder class controlling the type of tree that will be + returned. Built in treebuilders can be accessed through + html5lib.treebuilders.getTreeBuilder(treeType) + + :arg strict: raise an exception when a parse error is encountered + + :arg namespaceHTMLElements: whether or not to namespace HTML elements + + :arg debug: whether or not to enable debug mode which logs things + + Example: + + >>> from html5lib.html5parser import HTMLParser + >>> parser = HTMLParser() # generates parser with etree builder + >>> parser = HTMLParser('lxml', strict=True) # generates parser with lxml builder which is strict + + """ + + # Raise an exception on the first error encountered + self.strict = strict + + if tree is None: + tree = treebuilders.getTreeBuilder("etree") + self.tree = tree(namespaceHTMLElements) + self.errors = [] + + self.phases = dict([(name, cls(self, self.tree)) for name, cls in + getPhases(debug).items()]) + + def _parse(self, stream, innerHTML=False, container="div", scripting=False, **kwargs): + + self.innerHTMLMode = innerHTML + self.container = container + self.scripting = scripting + self.tokenizer = _tokenizer.HTMLTokenizer(stream, parser=self, **kwargs) + self.reset() + + try: + self.mainLoop() + except _ReparseException: + self.reset() + self.mainLoop() + + def reset(self): + self.tree.reset() + self.firstStartTag = False + self.errors = [] + self.log = [] # only used with debug mode + # "quirks" / "limited quirks" / "no quirks" + self.compatMode = "no quirks" + + if self.innerHTMLMode: + self.innerHTML = self.container.lower() + + if self.innerHTML in cdataElements: + self.tokenizer.state = self.tokenizer.rcdataState + elif self.innerHTML in rcdataElements: + self.tokenizer.state = self.tokenizer.rawtextState + elif self.innerHTML == 'plaintext': + self.tokenizer.state = self.tokenizer.plaintextState + else: + # state already is data state + # self.tokenizer.state = self.tokenizer.dataState + pass + self.phase = self.phases["beforeHtml"] + self.phase.insertHtmlElement() + self.resetInsertionMode() + else: + self.innerHTML = False # pylint:disable=redefined-variable-type + self.phase = self.phases["initial"] + + self.lastPhase = None + + self.beforeRCDataPhase = None + + self.framesetOK = True + + @property + def documentEncoding(self): + """Name of the character encoding that was used to decode the input stream, or + :obj:`None` if that is not determined yet + + """ + if not hasattr(self, 'tokenizer'): + return None + return self.tokenizer.stream.charEncoding[0].name + + def isHTMLIntegrationPoint(self, element): + if (element.name == "annotation-xml" and + element.namespace == namespaces["mathml"]): + return ("encoding" in element.attributes and + element.attributes["encoding"].translate( + asciiUpper2Lower) in + ("text/html", "application/xhtml+xml")) + else: + return (element.namespace, element.name) in htmlIntegrationPointElements + + def isMathMLTextIntegrationPoint(self, element): + return (element.namespace, element.name) in mathmlTextIntegrationPointElements + + def mainLoop(self): + CharactersToken = tokenTypes["Characters"] + SpaceCharactersToken = tokenTypes["SpaceCharacters"] + StartTagToken = tokenTypes["StartTag"] + EndTagToken = tokenTypes["EndTag"] + CommentToken = tokenTypes["Comment"] + DoctypeToken = tokenTypes["Doctype"] + ParseErrorToken = tokenTypes["ParseError"] + + for token in self.normalizedTokens(): + prev_token = None + new_token = token + while new_token is not None: + prev_token = new_token + currentNode = self.tree.openElements[-1] if self.tree.openElements else None + currentNodeNamespace = currentNode.namespace if currentNode else None + currentNodeName = currentNode.name if currentNode else None + + type = new_token["type"] + + if type == ParseErrorToken: + self.parseError(new_token["data"], new_token.get("datavars", {})) + new_token = None + else: + if (len(self.tree.openElements) == 0 or + currentNodeNamespace == self.tree.defaultNamespace or + (self.isMathMLTextIntegrationPoint(currentNode) and + ((type == StartTagToken and + token["name"] not in frozenset(["mglyph", "malignmark"])) or + type in (CharactersToken, SpaceCharactersToken))) or + (currentNodeNamespace == namespaces["mathml"] and + currentNodeName == "annotation-xml" and + type == StartTagToken and + token["name"] == "svg") or + (self.isHTMLIntegrationPoint(currentNode) and + type in (StartTagToken, CharactersToken, SpaceCharactersToken))): + phase = self.phase + else: + phase = self.phases["inForeignContent"] + + if type == CharactersToken: + new_token = phase.processCharacters(new_token) + elif type == SpaceCharactersToken: + new_token = phase.processSpaceCharacters(new_token) + elif type == StartTagToken: + new_token = phase.processStartTag(new_token) + elif type == EndTagToken: + new_token = phase.processEndTag(new_token) + elif type == CommentToken: + new_token = phase.processComment(new_token) + elif type == DoctypeToken: + new_token = phase.processDoctype(new_token) + + if (type == StartTagToken and prev_token["selfClosing"] and + not prev_token["selfClosingAcknowledged"]): + self.parseError("non-void-element-with-trailing-solidus", + {"name": prev_token["name"]}) + + # When the loop finishes it's EOF + reprocess = True + phases = [] + while reprocess: + phases.append(self.phase) + reprocess = self.phase.processEOF() + if reprocess: + assert self.phase not in phases + + def normalizedTokens(self): + for token in self.tokenizer: + yield self.normalizeToken(token) + + def parse(self, stream, *args, **kwargs): + """Parse a HTML document into a well-formed tree + + :arg stream: a file-like object or string containing the HTML to be parsed + + The optional encoding parameter must be a string that indicates + the encoding. If specified, that encoding will be used, + regardless of any BOM or later declaration (such as in a meta + element). + + :arg scripting: treat noscript elements as if JavaScript was turned on + + :returns: parsed tree + + Example: + + >>> from html5lib.html5parser import HTMLParser + >>> parser = HTMLParser() + >>> parser.parse('

This is a doc

') + + + """ + self._parse(stream, False, None, *args, **kwargs) + return self.tree.getDocument() + + def parseFragment(self, stream, *args, **kwargs): + """Parse a HTML fragment into a well-formed tree fragment + + :arg container: name of the element we're setting the innerHTML + property if set to None, default to 'div' + + :arg stream: a file-like object or string containing the HTML to be parsed + + The optional encoding parameter must be a string that indicates + the encoding. If specified, that encoding will be used, + regardless of any BOM or later declaration (such as in a meta + element) + + :arg scripting: treat noscript elements as if JavaScript was turned on + + :returns: parsed tree + + Example: + + >>> from html5lib.html5libparser import HTMLParser + >>> parser = HTMLParser() + >>> parser.parseFragment('this is a fragment') + + + """ + self._parse(stream, True, *args, **kwargs) + return self.tree.getFragment() + + def parseError(self, errorcode="XXX-undefined-error", datavars=None): + # XXX The idea is to make errorcode mandatory. + if datavars is None: + datavars = {} + self.errors.append((self.tokenizer.stream.position(), errorcode, datavars)) + if self.strict: + raise ParseError(E[errorcode] % datavars) + + def normalizeToken(self, token): + # HTML5 specific normalizations to the token stream + if token["type"] == tokenTypes["StartTag"]: + raw = token["data"] + token["data"] = OrderedDict(raw) + if len(raw) > len(token["data"]): + # we had some duplicated attribute, fix so first wins + token["data"].update(raw[::-1]) + + return token + + def adjustMathMLAttributes(self, token): + adjust_attributes(token, adjustMathMLAttributes) + + def adjustSVGAttributes(self, token): + adjust_attributes(token, adjustSVGAttributes) + + def adjustForeignAttributes(self, token): + adjust_attributes(token, adjustForeignAttributesMap) + + def reparseTokenNormal(self, token): + # pylint:disable=unused-argument + self.parser.phase() + + def resetInsertionMode(self): + # The name of this method is mostly historical. (It's also used in the + # specification.) + last = False + newModes = { + "select": "inSelect", + "td": "inCell", + "th": "inCell", + "tr": "inRow", + "tbody": "inTableBody", + "thead": "inTableBody", + "tfoot": "inTableBody", + "caption": "inCaption", + "colgroup": "inColumnGroup", + "table": "inTable", + "head": "inBody", + "body": "inBody", + "frameset": "inFrameset", + "html": "beforeHead" + } + for node in self.tree.openElements[::-1]: + nodeName = node.name + new_phase = None + if node == self.tree.openElements[0]: + assert self.innerHTML + last = True + nodeName = self.innerHTML + # Check for conditions that should only happen in the innerHTML + # case + if nodeName in ("select", "colgroup", "head", "html"): + assert self.innerHTML + + if not last and node.namespace != self.tree.defaultNamespace: + continue + + if nodeName in newModes: + new_phase = self.phases[newModes[nodeName]] + break + elif last: + new_phase = self.phases["inBody"] + break + + self.phase = new_phase + + def parseRCDataRawtext(self, token, contentType): + # Generic RCDATA/RAWTEXT Parsing algorithm + assert contentType in ("RAWTEXT", "RCDATA") + + self.tree.insertElement(token) + + if contentType == "RAWTEXT": + self.tokenizer.state = self.tokenizer.rawtextState + else: + self.tokenizer.state = self.tokenizer.rcdataState + + self.originalPhase = self.phase + + self.phase = self.phases["text"] + + +@_utils.memoize +def getPhases(debug): + def log(function): + """Logger that records which phase processes each token""" + type_names = dict((value, key) for key, value in + tokenTypes.items()) + + def wrapped(self, *args, **kwargs): + if function.__name__.startswith("process") and len(args) > 0: + token = args[0] + try: + info = {"type": type_names[token['type']]} + except: + raise + if token['type'] in tagTokenTypes: + info["name"] = token['name'] + + self.parser.log.append((self.parser.tokenizer.state.__name__, + self.parser.phase.__class__.__name__, + self.__class__.__name__, + function.__name__, + info)) + return function(self, *args, **kwargs) + else: + return function(self, *args, **kwargs) + return wrapped + + def getMetaclass(use_metaclass, metaclass_func): + if use_metaclass: + return method_decorator_metaclass(metaclass_func) + else: + return type + + # pylint:disable=unused-argument + class Phase(with_metaclass(getMetaclass(debug, log))): + """Base class for helper object that implements each phase of processing + """ + + def __init__(self, parser, tree): + self.parser = parser + self.tree = tree + + def processEOF(self): + raise NotImplementedError + + def processComment(self, token): + # For most phases the following is correct. Where it's not it will be + # overridden. + self.tree.insertComment(token, self.tree.openElements[-1]) + + def processDoctype(self, token): + self.parser.parseError("unexpected-doctype") + + def processCharacters(self, token): + self.tree.insertText(token["data"]) + + def processSpaceCharacters(self, token): + self.tree.insertText(token["data"]) + + def processStartTag(self, token): + return self.startTagHandler[token["name"]](token) + + def startTagHtml(self, token): + if not self.parser.firstStartTag and token["name"] == "html": + self.parser.parseError("non-html-root") + # XXX Need a check here to see if the first start tag token emitted is + # this token... If it's not, invoke self.parser.parseError(). + for attr, value in token["data"].items(): + if attr not in self.tree.openElements[0].attributes: + self.tree.openElements[0].attributes[attr] = value + self.parser.firstStartTag = False + + def processEndTag(self, token): + return self.endTagHandler[token["name"]](token) + + class InitialPhase(Phase): + def processSpaceCharacters(self, token): + pass + + def processComment(self, token): + self.tree.insertComment(token, self.tree.document) + + def processDoctype(self, token): + name = token["name"] + publicId = token["publicId"] + systemId = token["systemId"] + correct = token["correct"] + + if (name != "html" or publicId is not None or + systemId is not None and systemId != "about:legacy-compat"): + self.parser.parseError("unknown-doctype") + + if publicId is None: + publicId = "" + + self.tree.insertDoctype(token) + + if publicId != "": + publicId = publicId.translate(asciiUpper2Lower) + + if (not correct or token["name"] != "html" or + publicId.startswith( + ("+//silmaril//dtd html pro v0r11 19970101//", + "-//advasoft ltd//dtd html 3.0 aswedit + extensions//", + "-//as//dtd html 3.0 aswedit + extensions//", + "-//ietf//dtd html 2.0 level 1//", + "-//ietf//dtd html 2.0 level 2//", + "-//ietf//dtd html 2.0 strict level 1//", + "-//ietf//dtd html 2.0 strict level 2//", + "-//ietf//dtd html 2.0 strict//", + "-//ietf//dtd html 2.0//", + "-//ietf//dtd html 2.1e//", + "-//ietf//dtd html 3.0//", + "-//ietf//dtd html 3.2 final//", + "-//ietf//dtd html 3.2//", + "-//ietf//dtd html 3//", + "-//ietf//dtd html level 0//", + "-//ietf//dtd html level 1//", + "-//ietf//dtd html level 2//", + "-//ietf//dtd html level 3//", + "-//ietf//dtd html strict level 0//", + "-//ietf//dtd html strict level 1//", + "-//ietf//dtd html strict level 2//", + "-//ietf//dtd html strict level 3//", + "-//ietf//dtd html strict//", + "-//ietf//dtd html//", + "-//metrius//dtd metrius presentational//", + "-//microsoft//dtd internet explorer 2.0 html strict//", + "-//microsoft//dtd internet explorer 2.0 html//", + "-//microsoft//dtd internet explorer 2.0 tables//", + "-//microsoft//dtd internet explorer 3.0 html strict//", + "-//microsoft//dtd internet explorer 3.0 html//", + "-//microsoft//dtd internet explorer 3.0 tables//", + "-//netscape comm. corp.//dtd html//", + "-//netscape comm. corp.//dtd strict html//", + "-//o'reilly and associates//dtd html 2.0//", + "-//o'reilly and associates//dtd html extended 1.0//", + "-//o'reilly and associates//dtd html extended relaxed 1.0//", + "-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//", + "-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//", + "-//spyglass//dtd html 2.0 extended//", + "-//sq//dtd html 2.0 hotmetal + extensions//", + "-//sun microsystems corp.//dtd hotjava html//", + "-//sun microsystems corp.//dtd hotjava strict html//", + "-//w3c//dtd html 3 1995-03-24//", + "-//w3c//dtd html 3.2 draft//", + "-//w3c//dtd html 3.2 final//", + "-//w3c//dtd html 3.2//", + "-//w3c//dtd html 3.2s draft//", + "-//w3c//dtd html 4.0 frameset//", + "-//w3c//dtd html 4.0 transitional//", + "-//w3c//dtd html experimental 19960712//", + "-//w3c//dtd html experimental 970421//", + "-//w3c//dtd w3 html//", + "-//w3o//dtd w3 html 3.0//", + "-//webtechs//dtd mozilla html 2.0//", + "-//webtechs//dtd mozilla html//")) or + publicId in ("-//w3o//dtd w3 html strict 3.0//en//", + "-/w3c/dtd html 4.0 transitional/en", + "html") or + publicId.startswith( + ("-//w3c//dtd html 4.01 frameset//", + "-//w3c//dtd html 4.01 transitional//")) and + systemId is None or + systemId and systemId.lower() == "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd"): + self.parser.compatMode = "quirks" + elif (publicId.startswith( + ("-//w3c//dtd xhtml 1.0 frameset//", + "-//w3c//dtd xhtml 1.0 transitional//")) or + publicId.startswith( + ("-//w3c//dtd html 4.01 frameset//", + "-//w3c//dtd html 4.01 transitional//")) and + systemId is not None): + self.parser.compatMode = "limited quirks" + + self.parser.phase = self.parser.phases["beforeHtml"] + + def anythingElse(self): + self.parser.compatMode = "quirks" + self.parser.phase = self.parser.phases["beforeHtml"] + + def processCharacters(self, token): + self.parser.parseError("expected-doctype-but-got-chars") + self.anythingElse() + return token + + def processStartTag(self, token): + self.parser.parseError("expected-doctype-but-got-start-tag", + {"name": token["name"]}) + self.anythingElse() + return token + + def processEndTag(self, token): + self.parser.parseError("expected-doctype-but-got-end-tag", + {"name": token["name"]}) + self.anythingElse() + return token + + def processEOF(self): + self.parser.parseError("expected-doctype-but-got-eof") + self.anythingElse() + return True + + class BeforeHtmlPhase(Phase): + # helper methods + def insertHtmlElement(self): + self.tree.insertRoot(impliedTagToken("html", "StartTag")) + self.parser.phase = self.parser.phases["beforeHead"] + + # other + def processEOF(self): + self.insertHtmlElement() + return True + + def processComment(self, token): + self.tree.insertComment(token, self.tree.document) + + def processSpaceCharacters(self, token): + pass + + def processCharacters(self, token): + self.insertHtmlElement() + return token + + def processStartTag(self, token): + if token["name"] == "html": + self.parser.firstStartTag = True + self.insertHtmlElement() + return token + + def processEndTag(self, token): + if token["name"] not in ("head", "body", "html", "br"): + self.parser.parseError("unexpected-end-tag-before-html", + {"name": token["name"]}) + else: + self.insertHtmlElement() + return token + + class BeforeHeadPhase(Phase): + def __init__(self, parser, tree): + Phase.__init__(self, parser, tree) + + self.startTagHandler = _utils.MethodDispatcher([ + ("html", self.startTagHtml), + ("head", self.startTagHead) + ]) + self.startTagHandler.default = self.startTagOther + + self.endTagHandler = _utils.MethodDispatcher([ + (("head", "body", "html", "br"), self.endTagImplyHead) + ]) + self.endTagHandler.default = self.endTagOther + + def processEOF(self): + self.startTagHead(impliedTagToken("head", "StartTag")) + return True + + def processSpaceCharacters(self, token): + pass + + def processCharacters(self, token): + self.startTagHead(impliedTagToken("head", "StartTag")) + return token + + def startTagHtml(self, token): + return self.parser.phases["inBody"].processStartTag(token) + + def startTagHead(self, token): + self.tree.insertElement(token) + self.tree.headPointer = self.tree.openElements[-1] + self.parser.phase = self.parser.phases["inHead"] + + def startTagOther(self, token): + self.startTagHead(impliedTagToken("head", "StartTag")) + return token + + def endTagImplyHead(self, token): + self.startTagHead(impliedTagToken("head", "StartTag")) + return token + + def endTagOther(self, token): + self.parser.parseError("end-tag-after-implied-root", + {"name": token["name"]}) + + class InHeadPhase(Phase): + def __init__(self, parser, tree): + Phase.__init__(self, parser, tree) + + self.startTagHandler = _utils.MethodDispatcher([ + ("html", self.startTagHtml), + ("title", self.startTagTitle), + (("noframes", "style"), self.startTagNoFramesStyle), + ("noscript", self.startTagNoscript), + ("script", self.startTagScript), + (("base", "basefont", "bgsound", "command", "link"), + self.startTagBaseLinkCommand), + ("meta", self.startTagMeta), + ("head", self.startTagHead) + ]) + self.startTagHandler.default = self.startTagOther + + self.endTagHandler = _utils.MethodDispatcher([ + ("head", self.endTagHead), + (("br", "html", "body"), self.endTagHtmlBodyBr) + ]) + self.endTagHandler.default = self.endTagOther + + # the real thing + def processEOF(self): + self.anythingElse() + return True + + def processCharacters(self, token): + self.anythingElse() + return token + + def startTagHtml(self, token): + return self.parser.phases["inBody"].processStartTag(token) + + def startTagHead(self, token): + self.parser.parseError("two-heads-are-not-better-than-one") + + def startTagBaseLinkCommand(self, token): + self.tree.insertElement(token) + self.tree.openElements.pop() + token["selfClosingAcknowledged"] = True + + def startTagMeta(self, token): + self.tree.insertElement(token) + self.tree.openElements.pop() + token["selfClosingAcknowledged"] = True + + attributes = token["data"] + if self.parser.tokenizer.stream.charEncoding[1] == "tentative": + if "charset" in attributes: + self.parser.tokenizer.stream.changeEncoding(attributes["charset"]) + elif ("content" in attributes and + "http-equiv" in attributes and + attributes["http-equiv"].lower() == "content-type"): + # Encoding it as UTF-8 here is a hack, as really we should pass + # the abstract Unicode string, and just use the + # ContentAttrParser on that, but using UTF-8 allows all chars + # to be encoded and as a ASCII-superset works. + data = _inputstream.EncodingBytes(attributes["content"].encode("utf-8")) + parser = _inputstream.ContentAttrParser(data) + codec = parser.parse() + self.parser.tokenizer.stream.changeEncoding(codec) + + def startTagTitle(self, token): + self.parser.parseRCDataRawtext(token, "RCDATA") + + def startTagNoFramesStyle(self, token): + # Need to decide whether to implement the scripting-disabled case + self.parser.parseRCDataRawtext(token, "RAWTEXT") + + def startTagNoscript(self, token): + if self.parser.scripting: + self.parser.parseRCDataRawtext(token, "RAWTEXT") + else: + self.tree.insertElement(token) + self.parser.phase = self.parser.phases["inHeadNoscript"] + + def startTagScript(self, token): + self.tree.insertElement(token) + self.parser.tokenizer.state = self.parser.tokenizer.scriptDataState + self.parser.originalPhase = self.parser.phase + self.parser.phase = self.parser.phases["text"] + + def startTagOther(self, token): + self.anythingElse() + return token + + def endTagHead(self, token): + node = self.parser.tree.openElements.pop() + assert node.name == "head", "Expected head got %s" % node.name + self.parser.phase = self.parser.phases["afterHead"] + + def endTagHtmlBodyBr(self, token): + self.anythingElse() + return token + + def endTagOther(self, token): + self.parser.parseError("unexpected-end-tag", {"name": token["name"]}) + + def anythingElse(self): + self.endTagHead(impliedTagToken("head")) + + class InHeadNoscriptPhase(Phase): + def __init__(self, parser, tree): + Phase.__init__(self, parser, tree) + + self.startTagHandler = _utils.MethodDispatcher([ + ("html", self.startTagHtml), + (("basefont", "bgsound", "link", "meta", "noframes", "style"), self.startTagBaseLinkCommand), + (("head", "noscript"), self.startTagHeadNoscript), + ]) + self.startTagHandler.default = self.startTagOther + + self.endTagHandler = _utils.MethodDispatcher([ + ("noscript", self.endTagNoscript), + ("br", self.endTagBr), + ]) + self.endTagHandler.default = self.endTagOther + + def processEOF(self): + self.parser.parseError("eof-in-head-noscript") + self.anythingElse() + return True + + def processComment(self, token): + return self.parser.phases["inHead"].processComment(token) + + def processCharacters(self, token): + self.parser.parseError("char-in-head-noscript") + self.anythingElse() + return token + + def processSpaceCharacters(self, token): + return self.parser.phases["inHead"].processSpaceCharacters(token) + + def startTagHtml(self, token): + return self.parser.phases["inBody"].processStartTag(token) + + def startTagBaseLinkCommand(self, token): + return self.parser.phases["inHead"].processStartTag(token) + + def startTagHeadNoscript(self, token): + self.parser.parseError("unexpected-start-tag", {"name": token["name"]}) + + def startTagOther(self, token): + self.parser.parseError("unexpected-inhead-noscript-tag", {"name": token["name"]}) + self.anythingElse() + return token + + def endTagNoscript(self, token): + node = self.parser.tree.openElements.pop() + assert node.name == "noscript", "Expected noscript got %s" % node.name + self.parser.phase = self.parser.phases["inHead"] + + def endTagBr(self, token): + self.parser.parseError("unexpected-inhead-noscript-tag", {"name": token["name"]}) + self.anythingElse() + return token + + def endTagOther(self, token): + self.parser.parseError("unexpected-end-tag", {"name": token["name"]}) + + def anythingElse(self): + # Caller must raise parse error first! + self.endTagNoscript(impliedTagToken("noscript")) + + class AfterHeadPhase(Phase): + def __init__(self, parser, tree): + Phase.__init__(self, parser, tree) + + self.startTagHandler = _utils.MethodDispatcher([ + ("html", self.startTagHtml), + ("body", self.startTagBody), + ("frameset", self.startTagFrameset), + (("base", "basefont", "bgsound", "link", "meta", "noframes", "script", + "style", "title"), + self.startTagFromHead), + ("head", self.startTagHead) + ]) + self.startTagHandler.default = self.startTagOther + self.endTagHandler = _utils.MethodDispatcher([(("body", "html", "br"), + self.endTagHtmlBodyBr)]) + self.endTagHandler.default = self.endTagOther + + def processEOF(self): + self.anythingElse() + return True + + def processCharacters(self, token): + self.anythingElse() + return token + + def startTagHtml(self, token): + return self.parser.phases["inBody"].processStartTag(token) + + def startTagBody(self, token): + self.parser.framesetOK = False + self.tree.insertElement(token) + self.parser.phase = self.parser.phases["inBody"] + + def startTagFrameset(self, token): + self.tree.insertElement(token) + self.parser.phase = self.parser.phases["inFrameset"] + + def startTagFromHead(self, token): + self.parser.parseError("unexpected-start-tag-out-of-my-head", + {"name": token["name"]}) + self.tree.openElements.append(self.tree.headPointer) + self.parser.phases["inHead"].processStartTag(token) + for node in self.tree.openElements[::-1]: + if node.name == "head": + self.tree.openElements.remove(node) + break + + def startTagHead(self, token): + self.parser.parseError("unexpected-start-tag", {"name": token["name"]}) + + def startTagOther(self, token): + self.anythingElse() + return token + + def endTagHtmlBodyBr(self, token): + self.anythingElse() + return token + + def endTagOther(self, token): + self.parser.parseError("unexpected-end-tag", {"name": token["name"]}) + + def anythingElse(self): + self.tree.insertElement(impliedTagToken("body", "StartTag")) + self.parser.phase = self.parser.phases["inBody"] + self.parser.framesetOK = True + + class InBodyPhase(Phase): + # http://www.whatwg.org/specs/web-apps/current-work/#parsing-main-inbody + # the really-really-really-very crazy mode + def __init__(self, parser, tree): + Phase.__init__(self, parser, tree) + + # Set this to the default handler + self.processSpaceCharacters = self.processSpaceCharactersNonPre + + self.startTagHandler = _utils.MethodDispatcher([ + ("html", self.startTagHtml), + (("base", "basefont", "bgsound", "command", "link", "meta", + "script", "style", "title"), + self.startTagProcessInHead), + ("body", self.startTagBody), + ("frameset", self.startTagFrameset), + (("address", "article", "aside", "blockquote", "center", "details", + "dir", "div", "dl", "fieldset", "figcaption", "figure", + "footer", "header", "hgroup", "main", "menu", "nav", "ol", "p", + "section", "summary", "ul"), + self.startTagCloseP), + (headingElements, self.startTagHeading), + (("pre", "listing"), self.startTagPreListing), + ("form", self.startTagForm), + (("li", "dd", "dt"), self.startTagListItem), + ("plaintext", self.startTagPlaintext), + ("a", self.startTagA), + (("b", "big", "code", "em", "font", "i", "s", "small", "strike", + "strong", "tt", "u"), self.startTagFormatting), + ("nobr", self.startTagNobr), + ("button", self.startTagButton), + (("applet", "marquee", "object"), self.startTagAppletMarqueeObject), + ("xmp", self.startTagXmp), + ("table", self.startTagTable), + (("area", "br", "embed", "img", "keygen", "wbr"), + self.startTagVoidFormatting), + (("param", "source", "track"), self.startTagParamSource), + ("input", self.startTagInput), + ("hr", self.startTagHr), + ("image", self.startTagImage), + ("isindex", self.startTagIsIndex), + ("textarea", self.startTagTextarea), + ("iframe", self.startTagIFrame), + ("noscript", self.startTagNoscript), + (("noembed", "noframes"), self.startTagRawtext), + ("select", self.startTagSelect), + (("rp", "rt"), self.startTagRpRt), + (("option", "optgroup"), self.startTagOpt), + (("math"), self.startTagMath), + (("svg"), self.startTagSvg), + (("caption", "col", "colgroup", "frame", "head", + "tbody", "td", "tfoot", "th", "thead", + "tr"), self.startTagMisplaced) + ]) + self.startTagHandler.default = self.startTagOther + + self.endTagHandler = _utils.MethodDispatcher([ + ("body", self.endTagBody), + ("html", self.endTagHtml), + (("address", "article", "aside", "blockquote", "button", "center", + "details", "dialog", "dir", "div", "dl", "fieldset", "figcaption", "figure", + "footer", "header", "hgroup", "listing", "main", "menu", "nav", "ol", "pre", + "section", "summary", "ul"), self.endTagBlock), + ("form", self.endTagForm), + ("p", self.endTagP), + (("dd", "dt", "li"), self.endTagListItem), + (headingElements, self.endTagHeading), + (("a", "b", "big", "code", "em", "font", "i", "nobr", "s", "small", + "strike", "strong", "tt", "u"), self.endTagFormatting), + (("applet", "marquee", "object"), self.endTagAppletMarqueeObject), + ("br", self.endTagBr), + ]) + self.endTagHandler.default = self.endTagOther + + def isMatchingFormattingElement(self, node1, node2): + return (node1.name == node2.name and + node1.namespace == node2.namespace and + node1.attributes == node2.attributes) + + # helper + def addFormattingElement(self, token): + self.tree.insertElement(token) + element = self.tree.openElements[-1] + + matchingElements = [] + for node in self.tree.activeFormattingElements[::-1]: + if node is Marker: + break + elif self.isMatchingFormattingElement(node, element): + matchingElements.append(node) + + assert len(matchingElements) <= 3 + if len(matchingElements) == 3: + self.tree.activeFormattingElements.remove(matchingElements[-1]) + self.tree.activeFormattingElements.append(element) + + # the real deal + def processEOF(self): + allowed_elements = frozenset(("dd", "dt", "li", "p", "tbody", "td", + "tfoot", "th", "thead", "tr", "body", + "html")) + for node in self.tree.openElements[::-1]: + if node.name not in allowed_elements: + self.parser.parseError("expected-closing-tag-but-got-eof") + break + # Stop parsing + + def processSpaceCharactersDropNewline(self, token): + # Sometimes (start of 
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+    
+    
+  
+  
+    

+"""
+FOOTER = u"""\
+      

+        Brought to you by DON'T PANIC, your
+        friendly Werkzeug powered traceback interpreter.
+      

+    

+
+    

+      

+        
Console Locked

+        

+          The console is locked and needs to be unlocked by entering the PIN.
+          You can find the PIN printed out on the standard output of your
+          shell that runs the server.
+        

+          
PIN:
+            
+            
+        

+      

+    

+  
+
+"""
+
+PAGE_HTML = (
+    HEADER
+    + u"""\
+
%(exception_type)s

+

+  
%(exception)s

+

+
Traceback (most recent call last)

+%(summary)s
+

+  

+    

+      
+      This is the Copy/Paste friendly version of the traceback.  You can also paste this traceback into
+      a gist:
+      
+    

+    
+  

+

+

+  The debugger caught an exception in your WSGI application.  You can now
+  look at the traceback which led to the error.  
+  If you enable JavaScript you can also use additional features such as code
+  execution (if the evalex feature is enabled), automatic pasting of the
+  exceptions and much more.
+

+"""
+    + FOOTER
+    + """
+
+"""
+)
+
+CONSOLE_HTML = (
+    HEADER
+    + u"""\
+
Interactive Console

+

+In this console you can execute Python expressions in the context of the
+application.  The initial namespace was created by the debugger automatically.
+

+
The Console requires JavaScript.

+"""
+    + FOOTER
+)
+
+SUMMARY_HTML = u"""\
+

+  %(title)s
+  
    %(frames)s

+  %(description)s
+

+"""
+
+FRAME_HTML = u"""\
+

+  
File "%(filename)s",
+      line %(lineno)s,
+      in %(function_name)s

+  
%(lines)s

+

+"""
+
+SOURCE_LINE_HTML = u"""\
+
+  %(lineno)s
+  %(code)s
+
+"""
+
+
+def render_console_html(secret, evalex_trusted=True):
+    return CONSOLE_HTML % {
+        "evalex": "true",
+        "evalex_trusted": "true" if evalex_trusted else "false",
+        "console": "true",
+        "title": "Console",
+        "secret": secret,
+        "traceback_id": -1,
+    }
+
+
+def get_current_traceback(
+    ignore_system_exceptions=False, show_hidden_frames=False, skip=0
+):
+    """Get the current exception info as `Traceback` object.  Per default
+    calling this method will reraise system exceptions such as generator exit,
+    system exit or others.  This behavior can be disabled by passing `False`
+    to the function as first parameter.
+    """
+    exc_type, exc_value, tb = sys.exc_info()
+    if ignore_system_exceptions and exc_type in system_exceptions:
+        reraise(exc_type, exc_value, tb)
+    for _ in range_type(skip):
+        if tb.tb_next is None:
+            break
+        tb = tb.tb_next
+    tb = Traceback(exc_type, exc_value, tb)
+    if not show_hidden_frames:
+        tb.filter_hidden_frames()
+    return tb
+
+
+class Line(object):
+    """Helper for the source renderer."""
+
+    __slots__ = ("lineno", "code", "in_frame", "current")
+
+    def __init__(self, lineno, code):
+        self.lineno = lineno
+        self.code = code
+        self.in_frame = False
+        self.current = False
+
+    @property
+    def classes(self):
+        rv = ["line"]
+        if self.in_frame:
+            rv.append("in-frame")
+        if self.current:
+            rv.append("current")
+        return rv
+
+    def render(self):
+        return SOURCE_LINE_HTML % {
+            "classes": u" ".join(self.classes),
+            "lineno": self.lineno,
+            "code": escape(self.code),
+        }
+
+
+class Traceback(object):
+    """Wraps a traceback."""
+
+    def __init__(self, exc_type, exc_value, tb):
+        self.exc_type = exc_type
+        self.exc_value = exc_value
+        self.tb = tb
+
+        exception_type = exc_type.__name__
+        if exc_type.__module__ not in {"builtins", "__builtin__", "exceptions"}:
+            exception_type = exc_type.__module__ + "." + exception_type
+        self.exception_type = exception_type
+
+        self.groups = []
+        memo = set()
+        while True:
+            self.groups.append(Group(exc_type, exc_value, tb))
+            memo.add(id(exc_value))
+            if PY2:
+                break
+            exc_value = exc_value.__cause__ or exc_value.__context__
+            if exc_value is None or id(exc_value) in memo:
+                break
+            exc_type = type(exc_value)
+            tb = exc_value.__traceback__
+        self.groups.reverse()
+        self.frames = [frame for group in self.groups for frame in group.frames]
+
+    def filter_hidden_frames(self):
+        """Remove the frames according to the paste spec."""
+        for group in self.groups:
+            group.filter_hidden_frames()
+
+        self.frames[:] = [frame for group in self.groups for frame in group.frames]
+
+    @property
+    def is_syntax_error(self):
+        """Is it a syntax error?"""
+        return isinstance(self.exc_value, SyntaxError)
+
+    @property
+    def exception(self):
+        """String representation of the final exception."""
+        return self.groups[-1].exception
+
+    def log(self, logfile=None):
+        """Log the ASCII traceback into a file object."""
+        if logfile is None:
+            logfile = sys.stderr
+        tb = self.plaintext.rstrip() + u"\n"
+        logfile.write(to_native(tb, "utf-8", "replace"))
+
+    def paste(self):
+        """Create a paste and return the paste id."""
+        data = json.dumps(
+            {
+                "description": "Werkzeug Internal Server Error",
+                "public": False,
+                "files": {"traceback.txt": {"content": self.plaintext}},
+            }
+        ).encode("utf-8")
+        try:
+            from urllib2 import urlopen
+        except ImportError:
+            from urllib.request import urlopen
+        rv = urlopen("https://api.github.com/gists", data=data)
+        resp = json.loads(rv.read().decode("utf-8"))
+        rv.close()
+        return {"url": resp["html_url"], "id": resp["id"]}
+
+    def render_summary(self, include_title=True):
+        """Render the traceback for the interactive console."""
+        title = ""
+        classes = ["traceback"]
+        if not self.frames:
+            classes.append("noframe-traceback")
+            frames = []
+        else:
+            library_frames = sum(frame.is_library for frame in self.frames)
+            mark_lib = 0 < library_frames < len(self.frames)
+            frames = [group.render(mark_lib=mark_lib) for group in self.groups]
+
+        if include_title:
+            if self.is_syntax_error:
+                title = u"Syntax Error"
+            else:
+                title = u"Traceback (most recent call last):"
+
+        if self.is_syntax_error:
+            description_wrapper = u"
%s
"
+        else:
+            description_wrapper = u"
%s
"
+
+        return SUMMARY_HTML % {
+            "classes": u" ".join(classes),
+            "title": u"
%s
" % title if title else u"",
+            "frames": u"\n".join(frames),
+            "description": description_wrapper % escape(self.exception),
+        }
+
+    def render_full(self, evalex=False, secret=None, evalex_trusted=True):
+        """Render the Full HTML page with the traceback info."""
+        exc = escape(self.exception)
+        return PAGE_HTML % {
+            "evalex": "true" if evalex else "false",
+            "evalex_trusted": "true" if evalex_trusted else "false",
+            "console": "false",
+            "title": exc,
+            "exception": exc,
+            "exception_type": escape(self.exception_type),
+            "summary": self.render_summary(include_title=False),
+            "plaintext": escape(self.plaintext),
+            "plaintext_cs": re.sub("-{2,}", "-", self.plaintext),
+            "traceback_id": self.id,
+            "secret": secret,
+        }
+
+    @cached_property
+    def plaintext(self):
+        return u"\n".join([group.render_text() for group in self.groups])
+
+    @property
+    def id(self):
+        return id(self)
+
+
+class Group(object):
+    """A group of frames for an exception in a traceback. On Python 3,
+    if the exception has a ``__cause__`` or ``__context__``, there are
+    multiple exception groups.
+    """
+
+    def __init__(self, exc_type, exc_value, tb):
+        self.exc_type = exc_type
+        self.exc_value = exc_value
+        self.info = None
+        if not PY2:
+            if exc_value.__cause__ is not None:
+                self.info = (
+                    u"The above exception was the direct cause of the"
+                    u" following exception"
+                )
+            elif exc_value.__context__ is not None:
+                self.info = (
+                    u"During handling of the above exception, another"
+                    u" exception occurred"
+                )
+
+        self.frames = []
+        while tb is not None:
+            self.frames.append(Frame(exc_type, exc_value, tb))
+            tb = tb.tb_next
+
+    def filter_hidden_frames(self):
+        new_frames = []
+        hidden = False
+
+        for frame in self.frames:
+            hide = frame.hide
+            if hide in ("before", "before_and_this"):
+                new_frames = []
+                hidden = False
+                if hide == "before_and_this":
+                    continue
+            elif hide in ("reset", "reset_and_this"):
+                hidden = False
+                if hide == "reset_and_this":
+                    continue
+            elif hide in ("after", "after_and_this"):
+                hidden = True
+                if hide == "after_and_this":
+                    continue
+            elif hide or hidden:
+                continue
+            new_frames.append(frame)
+
+        # if we only have one frame and that frame is from the codeop
+        # module, remove it.
+        if len(new_frames) == 1 and self.frames[0].module == "codeop":
+            del self.frames[:]
+
+        # if the last frame is missing something went terrible wrong :(
+        elif self.frames[-1] in new_frames:
+            self.frames[:] = new_frames
+
+    @property
+    def exception(self):
+        """String representation of the exception."""
+        buf = traceback.format_exception_only(self.exc_type, self.exc_value)
+        rv = "".join(buf).strip()
+        return to_unicode(rv, "utf-8", "replace")
+
+    def render(self, mark_lib=True):
+        out = []
+        if self.info is not None:
+            out.append(u'
  • %s:
    ' % self.info)
+        for frame in self.frames:
+            out.append(
+                u"%s"
+                % (
+                    u' title="%s"' % escape(frame.info) if frame.info else u"",
+                    frame.render(mark_lib=mark_lib),
+                )
+            )
+        return u"\n".join(out)
+
+    def render_text(self):
+        out = []
+        if self.info is not None:
+            out.append(u"\n%s:\n" % self.info)
+        out.append(u"Traceback (most recent call last):")
+        for frame in self.frames:
+            out.append(frame.render_text())
+        out.append(self.exception)
+        return u"\n".join(out)
+
+
+class Frame(object):
+    """A single frame in a traceback."""
+
+    def __init__(self, exc_type, exc_value, tb):
+        self.lineno = tb.tb_lineno
+        self.function_name = tb.tb_frame.f_code.co_name
+        self.locals = tb.tb_frame.f_locals
+        self.globals = tb.tb_frame.f_globals
+
+        fn = inspect.getsourcefile(tb) or inspect.getfile(tb)
+        if fn[-4:] in (".pyo", ".pyc"):
+            fn = fn[:-1]
+        # if it's a file on the file system resolve the real filename.
+        if os.path.isfile(fn):
+            fn = os.path.realpath(fn)
+        self.filename = to_unicode(fn, get_filesystem_encoding())
+        self.module = self.globals.get("__name__")
+        self.loader = self.globals.get("__loader__")
+        self.code = tb.tb_frame.f_code
+
+        # support for paste's traceback extensions
+        self.hide = self.locals.get("__traceback_hide__", False)
+        info = self.locals.get("__traceback_info__")
+        if info is not None:
+            info = to_unicode(info, "utf-8", "replace")
+        self.info = info
+
+    def render(self, mark_lib=True):
+        """Render a single frame in a traceback."""
+        return FRAME_HTML % {
+            "id": self.id,
+            "filename": escape(self.filename),
+            "lineno": self.lineno,
+            "function_name": escape(self.function_name),
+            "lines": self.render_line_context(),
+            "library": "library" if mark_lib and self.is_library else "",
+        }
+
+    @cached_property
+    def is_library(self):
+        return any(
+            self.filename.startswith(path) for path in sysconfig.get_paths().values()
+        )
+
+    def render_text(self):
+        return u'  File "%s", line %s, in %s\n    %s' % (
+            self.filename,
+            self.lineno,
+            self.function_name,
+            self.current_line.strip(),
+        )
+
+    def render_line_context(self):
+        before, current, after = self.get_context_lines()
+        rv = []
+
+        def render_line(line, cls):
+            line = line.expandtabs().rstrip()
+            stripped_line = line.strip()
+            prefix = len(line) - len(stripped_line)
+            rv.append(
+                '
    %s%s
    '
+                % (cls, " " * prefix, escape(stripped_line) or " ")
+            )
+
+        for line in before:
+            render_line(line, "before")
+        render_line(current, "current")
+        for line in after:
+            render_line(line, "after")
+
+        return "\n".join(rv)
+
+    def get_annotated_lines(self):
+        """Helper function that returns lines with extra information."""
+        lines = [Line(idx + 1, x) for idx, x in enumerate(self.sourcelines)]
+
+        # find function definition and mark lines
+        if hasattr(self.code, "co_firstlineno"):
+            lineno = self.code.co_firstlineno - 1
+            while lineno > 0:
+                if _funcdef_re.match(lines[lineno].code):
+                    break
+                lineno -= 1
+            try:
+                offset = len(inspect.getblock([x.code + "\n" for x in lines[lineno:]]))
+            except TokenError:
+                offset = 0
+            for line in lines[lineno : lineno + offset]:
+                line.in_frame = True
+
+        # mark current line
+        try:
+            lines[self.lineno - 1].current = True
+        except IndexError:
+            pass
+
+        return lines
+
+    def eval(self, code, mode="single"):
+        """Evaluate code in the context of the frame."""
+        if isinstance(code, string_types):
+            if PY2 and isinstance(code, text_type):  # noqa
+                code = UTF8_COOKIE + code.encode("utf-8")
+            code = compile(code, "", mode)
+        return eval(code, self.globals, self.locals)
+
+    @cached_property
+    def sourcelines(self):
+        """The sourcecode of the file as list of unicode strings."""
+        # get sourcecode from loader or file
+        source = None
+        if self.loader is not None:
+            try:
+                if hasattr(self.loader, "get_source"):
+                    source = self.loader.get_source(self.module)
+                elif hasattr(self.loader, "get_source_by_code"):
+                    source = self.loader.get_source_by_code(self.code)
+            except Exception:
+                # we munch the exception so that we don't cause troubles
+                # if the loader is broken.
+                pass
+
+        if source is None:
+            try:
+                f = open(to_native(self.filename, get_filesystem_encoding()), mode="rb")
+            except IOError:
+                return []
+            try:
+                source = f.read()
+            finally:
+                f.close()
+
+        # already unicode?  return right away
+        if isinstance(source, text_type):
+            return source.splitlines()
+
+        # yes. it should be ascii, but we don't want to reject too many
+        # characters in the debugger if something breaks
+        charset = "utf-8"
+        if source.startswith(UTF8_COOKIE):
+            source = source[3:]
+        else:
+            for idx, match in enumerate(_line_re.finditer(source)):
+                match = _coding_re.search(match.group())
+                if match is not None:
+                    charset = match.group(1)
+                    break
+                if idx > 1:
+                    break
+
+        # on broken cookies we fall back to utf-8 too
+        charset = to_native(charset)
+        try:
+            codecs.lookup(charset)
+        except LookupError:
+            charset = "utf-8"
+
+        return source.decode(charset, "replace").splitlines()
+
+    def get_context_lines(self, context=5):
+        before = self.sourcelines[self.lineno - context - 1 : self.lineno - 1]
+        past = self.sourcelines[self.lineno : self.lineno + context]
+        return (before, self.current_line, past)
+
+    @property
+    def current_line(self):
+        try:
+            return self.sourcelines[self.lineno - 1]
+        except IndexError:
+            return u""
+
+    @cached_property
+    def console(self):
+        return Console(self.globals, self.locals)
+
+    @property
+    def id(self):
+        return id(self)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/exceptions.py b/venv/lib/python3.7/site-packages/werkzeug/exceptions.py
new file mode 100644
index 0000000..fb6528d
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/exceptions.py
@@ -0,0 +1,774 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.exceptions
+    ~~~~~~~~~~~~~~~~~~~
+
+    This module implements a number of Python exceptions you can raise from
+    within your views to trigger a standard non-200 response.
+
+
+    Usage Example
+    -------------
+
+    ::
+
+        from werkzeug.wrappers import BaseRequest
+        from werkzeug.wsgi import responder
+        from werkzeug.exceptions import HTTPException, NotFound
+
+        def view(request):
+            raise NotFound()
+
+        @responder
+        def application(environ, start_response):
+            request = BaseRequest(environ)
+            try:
+                return view(request)
+            except HTTPException as e:
+                return e
+
+
+    As you can see from this example those exceptions are callable WSGI
+    applications.  Because of Python 2.4 compatibility those do not extend
+    from the response objects but only from the python exception class.
+
+    As a matter of fact they are not Werkzeug response objects.  However you
+    can get a response object by calling ``get_response()`` on a HTTP
+    exception.
+
+    Keep in mind that you have to pass an environment to ``get_response()``
+    because some errors fetch additional information from the WSGI
+    environment.
+
+    If you want to hook in a different exception page to say, a 404 status
+    code, you can add a second except for a specific subclass of an error::
+
+        @responder
+        def application(environ, start_response):
+            request = BaseRequest(environ)
+            try:
+                return view(request)
+            except NotFound, e:
+                return not_found(request)
+            except HTTPException, e:
+                return e
+
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import sys
+
+import werkzeug
+
+# Because of bootstrapping reasons we need to manually patch ourselves
+# onto our parent module.
+werkzeug.exceptions = sys.modules[__name__]
+
+from ._compat import implements_to_string
+from ._compat import integer_types
+from ._compat import iteritems
+from ._compat import text_type
+from ._internal import _get_environ
+from .wrappers import Response
+
+
+@implements_to_string
+class HTTPException(Exception):
+    """Baseclass for all HTTP exceptions.  This exception can be called as WSGI
+    application to render a default error page or you can catch the subclasses
+    of it independently and render nicer error messages.
+    """
+
+    code = None
+    description = None
+
+    def __init__(self, description=None, response=None):
+        super(Exception, self).__init__()
+        if description is not None:
+            self.description = description
+        self.response = response
+
+    @classmethod
+    def wrap(cls, exception, name=None):
+        """Create an exception that is a subclass of the calling HTTP
+        exception and the ``exception`` argument.
+
+        The first argument to the class will be passed to the
+        wrapped ``exception``, the rest to the HTTP exception. If
+        ``self.args`` is not empty, the wrapped exception message is
+        added to the HTTP exception description.
+
+        .. versionchanged:: 0.15
+            The description includes the wrapped exception message.
+        """
+
+        class newcls(cls, exception):
+            def __init__(self, arg=None, *args, **kwargs):
+                super(cls, self).__init__(*args, **kwargs)
+
+                if arg is None:
+                    exception.__init__(self)
+                else:
+                    exception.__init__(self, arg)
+
+            def get_description(self, environ=None):
+                out = super(cls, self).get_description(environ=environ)
+
+                if self.args:
+                    out += "
    {}: {}
    ".format(
+                        exception.__name__, escape(exception.__str__(self))
+                    )
+
+                return out
+
+        newcls.__module__ = sys._getframe(1).f_globals.get("__name__")
+        newcls.__name__ = name or cls.__name__ + exception.__name__
+        return newcls
+
+    @property
+    def name(self):
+        """The status name."""
+        return HTTP_STATUS_CODES.get(self.code, "Unknown Error")
+
+    def get_description(self, environ=None):
+        """Get the description."""
+        return u"
    %s
    " % escape(self.description)
+
+    def get_body(self, environ=None):
+        """Get the HTML body."""
+        return text_type(
+            (
+                u'\n'
+                u"%(code)s %(name)s\n"
+                u"
    %(name)s
    \n"
+                u"%(description)s\n"
+            )
+            % {
+                "code": self.code,
+                "name": escape(self.name),
+                "description": self.get_description(environ),
+            }
+        )
+
+    def get_headers(self, environ=None):
+        """Get a list of headers."""
+        return [("Content-Type", "text/html")]
+
+    def get_response(self, environ=None):
+        """Get a response object.  If one was passed to the exception
+        it's returned directly.
+
+        :param environ: the optional environ for the request.  This
+                        can be used to modify the response depending
+                        on how the request looked like.
+        :return: a :class:`Response` object or a subclass thereof.
+        """
+        if self.response is not None:
+            return self.response
+        if environ is not None:
+            environ = _get_environ(environ)
+        headers = self.get_headers(environ)
+        return Response(self.get_body(environ), self.code, headers)
+
+    def __call__(self, environ, start_response):
+        """Call the exception as WSGI application.
+
+        :param environ: the WSGI environment.
+        :param start_response: the response callable provided by the WSGI
+                               server.
+        """
+        response = self.get_response(environ)
+        return response(environ, start_response)
+
+    def __str__(self):
+        code = self.code if self.code is not None else "???"
+        return "%s %s: %s" % (code, self.name, self.description)
+
+    def __repr__(self):
+        code = self.code if self.code is not None else "???"
+        return "<%s '%s: %s'>" % (self.__class__.__name__, code, self.name)
+
+
+class BadRequest(HTTPException):
+    """*400* `Bad Request`
+
+    Raise if the browser sends something to the application the application
+    or server cannot handle.
+    """
+
+    code = 400
+    description = (
+        "The browser (or proxy) sent a request that this server could "
+        "not understand."
+    )
+
+
+class ClientDisconnected(BadRequest):
+    """Internal exception that is raised if Werkzeug detects a disconnected
+    client.  Since the client is already gone at that point attempting to
+    send the error message to the client might not work and might ultimately
+    result in another exception in the server.  Mainly this is here so that
+    it is silenced by default as far as Werkzeug is concerned.
+
+    Since disconnections cannot be reliably detected and are unspecified
+    by WSGI to a large extent this might or might not be raised if a client
+    is gone.
+
+    .. versionadded:: 0.8
+    """
+
+
+class SecurityError(BadRequest):
+    """Raised if something triggers a security error.  This is otherwise
+    exactly like a bad request error.
+
+    .. versionadded:: 0.9
+    """
+
+
+class BadHost(BadRequest):
+    """Raised if the submitted host is badly formatted.
+
+    .. versionadded:: 0.11.2
+    """
+
+
+class Unauthorized(HTTPException):
+    """*401* ``Unauthorized``
+
+    Raise if the user is not authorized to access a resource.
+
+    The ``www_authenticate`` argument should be used to set the
+    ``WWW-Authenticate`` header. This is used for HTTP basic auth and
+    other schemes. Use :class:`~werkzeug.datastructures.WWWAuthenticate`
+    to create correctly formatted values. Strictly speaking a 401
+    response is invalid if it doesn't provide at least one value for
+    this header, although real clients typically don't care.
+
+    :param description: Override the default message used for the body
+        of the response.
+    :param www-authenticate: A single value, or list of values, for the
+        WWW-Authenticate header.
+
+    .. versionchanged:: 0.15.3
+        If the ``www_authenticate`` argument is not set, the
+        ``WWW-Authenticate`` header is not set.
+
+    .. versionchanged:: 0.15.3
+        The ``response`` argument was restored.
+
+    .. versionchanged:: 0.15.1
+        ``description`` was moved back as the first argument, restoring
+         its previous position.
+
+    .. versionchanged:: 0.15.0
+        ``www_authenticate`` was added as the first argument, ahead of
+        ``description``.
+    """
+
+    code = 401
+    description = (
+        "The server could not verify that you are authorized to access"
+        " the URL requested. You either supplied the wrong credentials"
+        " (e.g. a bad password), or your browser doesn't understand"
+        " how to supply the credentials required."
+    )
+
+    def __init__(self, description=None, response=None, www_authenticate=None):
+        HTTPException.__init__(self, description, response)
+
+        if www_authenticate is not None:
+            if not isinstance(www_authenticate, (tuple, list)):
+                www_authenticate = (www_authenticate,)
+
+        self.www_authenticate = www_authenticate
+
+    def get_headers(self, environ=None):
+        headers = HTTPException.get_headers(self, environ)
+        if self.www_authenticate:
+            headers.append(
+                ("WWW-Authenticate", ", ".join([str(x) for x in self.www_authenticate]))
+            )
+        return headers
+
+
+class Forbidden(HTTPException):
+    """*403* `Forbidden`
+
+    Raise if the user doesn't have the permission for the requested resource
+    but was authenticated.
+    """
+
+    code = 403
+    description = (
+        "You don't have the permission to access the requested"
+        " resource. It is either read-protected or not readable by the"
+        " server."
+    )
+
+
+class NotFound(HTTPException):
+    """*404* `Not Found`
+
+    Raise if a resource does not exist and never existed.
+    """
+
+    code = 404
+    description = (
+        "The requested URL was not found on the server. If you entered"
+        " the URL manually please check your spelling and try again."
+    )
+
+
+class MethodNotAllowed(HTTPException):
+    """*405* `Method Not Allowed`
+
+    Raise if the server used a method the resource does not handle.  For
+    example `POST` if the resource is view only.  Especially useful for REST.
+
+    The first argument for this exception should be a list of allowed methods.
+    Strictly speaking the response would be invalid if you don't provide valid
+    methods in the header which you can do with that list.
+    """
+
+    code = 405
+    description = "The method is not allowed for the requested URL."
+
+    def __init__(self, valid_methods=None, description=None):
+        """Takes an optional list of valid http methods
+        starting with werkzeug 0.3 the list will be mandatory."""
+        HTTPException.__init__(self, description)
+        self.valid_methods = valid_methods
+
+    def get_headers(self, environ=None):
+        headers = HTTPException.get_headers(self, environ)
+        if self.valid_methods:
+            headers.append(("Allow", ", ".join(self.valid_methods)))
+        return headers
+
+
+class NotAcceptable(HTTPException):
+    """*406* `Not Acceptable`
+
+    Raise if the server can't return any content conforming to the
+    `Accept` headers of the client.
+    """
+
+    code = 406
+
+    description = (
+        "The resource identified by the request is only capable of"
+        " generating response entities which have content"
+        " characteristics not acceptable according to the accept"
+        " headers sent in the request."
+    )
+
+
+class RequestTimeout(HTTPException):
+    """*408* `Request Timeout`
+
+    Raise to signalize a timeout.
+    """
+
+    code = 408
+    description = (
+        "The server closed the network connection because the browser"
+        " didn't finish the request within the specified time."
+    )
+
+
+class Conflict(HTTPException):
+    """*409* `Conflict`
+
+    Raise to signal that a request cannot be completed because it conflicts
+    with the current state on the server.
+
+    .. versionadded:: 0.7
+    """
+
+    code = 409
+    description = (
+        "A conflict happened while processing the request. The"
+        " resource might have been modified while the request was being"
+        " processed."
+    )
+
+
+class Gone(HTTPException):
+    """*410* `Gone`
+
+    Raise if a resource existed previously and went away without new location.
+    """
+
+    code = 410
+    description = (
+        "The requested URL is no longer available on this server and"
+        " there is no forwarding address. If you followed a link from a"
+        " foreign page, please contact the author of this page."
+    )
+
+
+class LengthRequired(HTTPException):
+    """*411* `Length Required`
+
+    Raise if the browser submitted data but no ``Content-Length`` header which
+    is required for the kind of processing the server does.
+    """
+
+    code = 411
+    description = (
+        "A request with this method requires a valid Content-"
+        "Length header."
+    )
+
+
+class PreconditionFailed(HTTPException):
+    """*412* `Precondition Failed`
+
+    Status code used in combination with ``If-Match``, ``If-None-Match``, or
+    ``If-Unmodified-Since``.
+    """
+
+    code = 412
+    description = (
+        "The precondition on the request for the URL failed positive evaluation."
+    )
+
+
+class RequestEntityTooLarge(HTTPException):
+    """*413* `Request Entity Too Large`
+
+    The status code one should return if the data submitted exceeded a given
+    limit.
+    """
+
+    code = 413
+    description = "The data value transmitted exceeds the capacity limit."
+
+
+class RequestURITooLarge(HTTPException):
+    """*414* `Request URI Too Large`
+
+    Like *413* but for too long URLs.
+    """
+
+    code = 414
+    description = (
+        "The length of the requested URL exceeds the capacity limit for"
+        " this server. The request cannot be processed."
+    )
+
+
+class UnsupportedMediaType(HTTPException):
+    """*415* `Unsupported Media Type`
+
+    The status code returned if the server is unable to handle the media type
+    the client transmitted.
+    """
+
+    code = 415
+    description = (
+        "The server does not support the media type transmitted in the request."
+    )
+
+
+class RequestedRangeNotSatisfiable(HTTPException):
+    """*416* `Requested Range Not Satisfiable`
+
+    The client asked for an invalid part of the file.
+
+    .. versionadded:: 0.7
+    """
+
+    code = 416
+    description = "The server cannot provide the requested range."
+
+    def __init__(self, length=None, units="bytes", description=None):
+        """Takes an optional `Content-Range` header value based on ``length``
+        parameter.
+        """
+        HTTPException.__init__(self, description)
+        self.length = length
+        self.units = units
+
+    def get_headers(self, environ=None):
+        headers = HTTPException.get_headers(self, environ)
+        if self.length is not None:
+            headers.append(("Content-Range", "%s */%d" % (self.units, self.length)))
+        return headers
+
+
+class ExpectationFailed(HTTPException):
+    """*417* `Expectation Failed`
+
+    The server cannot meet the requirements of the Expect request-header.
+
+    .. versionadded:: 0.7
+    """
+
+    code = 417
+    description = "The server could not meet the requirements of the Expect header"
+
+
+class ImATeapot(HTTPException):
+    """*418* `I'm a teapot`
+
+    The server should return this if it is a teapot and someone attempted
+    to brew coffee with it.
+
+    .. versionadded:: 0.7
+    """
+
+    code = 418
+    description = "This server is a teapot, not a coffee machine"
+
+
+class UnprocessableEntity(HTTPException):
+    """*422* `Unprocessable Entity`
+
+    Used if the request is well formed, but the instructions are otherwise
+    incorrect.
+    """
+
+    code = 422
+    description = (
+        "The request was well-formed but was unable to be followed due"
+        " to semantic errors."
+    )
+
+
+class Locked(HTTPException):
+    """*423* `Locked`
+
+    Used if the resource that is being accessed is locked.
+    """
+
+    code = 423
+    description = "The resource that is being accessed is locked."
+
+
+class FailedDependency(HTTPException):
+    """*424* `Failed Dependency`
+
+    Used if the method could not be performed on the resource
+    because the requested action depended on another action and that action failed.
+    """
+
+    code = 424
+    description = (
+        "The method could not be performed on the resource because the"
+        " requested action depended on another action and that action"
+        " failed."
+    )
+
+
+class PreconditionRequired(HTTPException):
+    """*428* `Precondition Required`
+
+    The server requires this request to be conditional, typically to prevent
+    the lost update problem, which is a race condition between two or more
+    clients attempting to update a resource through PUT or DELETE. By requiring
+    each client to include a conditional header ("If-Match" or "If-Unmodified-
+    Since") with the proper value retained from a recent GET request, the
+    server ensures that each client has at least seen the previous revision of
+    the resource.
+    """
+
+    code = 428
+    description = (
+        "This request is required to be conditional; try using"
+        ' "If-Match" or "If-Unmodified-Since".'
+    )
+
+
+class TooManyRequests(HTTPException):
+    """*429* `Too Many Requests`
+
+    The server is limiting the rate at which this user receives responses, and
+    this request exceeds that rate. (The server may use any convenient method
+    to identify users and their request rates). The server may include a
+    "Retry-After" header to indicate how long the user should wait before
+    retrying.
+    """
+
+    code = 429
+    description = "This user has exceeded an allotted request count. Try again later."
+
+
+class RequestHeaderFieldsTooLarge(HTTPException):
+    """*431* `Request Header Fields Too Large`
+
+    The server refuses to process the request because the header fields are too
+    large. One or more individual fields may be too large, or the set of all
+    headers is too large.
+    """
+
+    code = 431
+    description = "One or more header fields exceeds the maximum size."
+
+
+class UnavailableForLegalReasons(HTTPException):
+    """*451* `Unavailable For Legal Reasons`
+
+    This status code indicates that the server is denying access to the
+    resource as a consequence of a legal demand.
+    """
+
+    code = 451
+    description = "Unavailable for legal reasons."
+
+
+class InternalServerError(HTTPException):
+    """*500* `Internal Server Error`
+
+    Raise if an internal server error occurred.  This is a good fallback if an
+    unknown error occurred in the dispatcher.
+    """
+
+    code = 500
+    description = (
+        "The server encountered an internal error and was unable to"
+        " complete your request. Either the server is overloaded or"
+        " there is an error in the application."
+    )
+
+
+class NotImplemented(HTTPException):
+    """*501* `Not Implemented`
+
+    Raise if the application does not support the action requested by the
+    browser.
+    """
+
+    code = 501
+    description = "The server does not support the action requested by the browser."
+
+
+class BadGateway(HTTPException):
+    """*502* `Bad Gateway`
+
+    If you do proxying in your application you should return this status code
+    if you received an invalid response from the upstream server it accessed
+    in attempting to fulfill the request.
+    """
+
+    code = 502
+    description = (
+        "The proxy server received an invalid response from an upstream server."
+    )
+
+
+class ServiceUnavailable(HTTPException):
+    """*503* `Service Unavailable`
+
+    Status code you should return if a service is temporarily unavailable.
+    """
+
+    code = 503
+    description = (
+        "The server is temporarily unable to service your request due"
+        " to maintenance downtime or capacity problems. Please try"
+        " again later."
+    )
+
+
+class GatewayTimeout(HTTPException):
+    """*504* `Gateway Timeout`
+
+    Status code you should return if a connection to an upstream server
+    times out.
+    """
+
+    code = 504
+    description = "The connection to an upstream server timed out."
+
+
+class HTTPVersionNotSupported(HTTPException):
+    """*505* `HTTP Version Not Supported`
+
+    The server does not support the HTTP protocol version used in the request.
+    """
+
+    code = 505
+    description = (
+        "The server does not support the HTTP protocol version used in the request."
+    )
+
+
+default_exceptions = {}
+__all__ = ["HTTPException"]
+
+
+def _find_exceptions():
+    for _name, obj in iteritems(globals()):
+        try:
+            is_http_exception = issubclass(obj, HTTPException)
+        except TypeError:
+            is_http_exception = False
+        if not is_http_exception or obj.code is None:
+            continue
+        __all__.append(obj.__name__)
+        old_obj = default_exceptions.get(obj.code, None)
+        if old_obj is not None and issubclass(obj, old_obj):
+            continue
+        default_exceptions[obj.code] = obj
+
+
+_find_exceptions()
+del _find_exceptions
+
+
+class Aborter(object):
+    """When passed a dict of code -> exception items it can be used as
+    callable that raises exceptions.  If the first argument to the
+    callable is an integer it will be looked up in the mapping, if it's
+    a WSGI application it will be raised in a proxy exception.
+
+    The rest of the arguments are forwarded to the exception constructor.
+    """
+
+    def __init__(self, mapping=None, extra=None):
+        if mapping is None:
+            mapping = default_exceptions
+        self.mapping = dict(mapping)
+        if extra is not None:
+            self.mapping.update(extra)
+
+    def __call__(self, code, *args, **kwargs):
+        if not args and not kwargs and not isinstance(code, integer_types):
+            raise HTTPException(response=code)
+        if code not in self.mapping:
+            raise LookupError("no exception for %r" % code)
+        raise self.mapping[code](*args, **kwargs)
+
+
+def abort(status, *args, **kwargs):
+    """Raises an :py:exc:`HTTPException` for the given status code or WSGI
+    application::
+
+        abort(404)  # 404 Not Found
+        abort(Response('Hello World'))
+
+    Can be passed a WSGI application or a status code.  If a status code is
+    given it's looked up in the list of exceptions and will raise that
+    exception, if passed a WSGI application it will wrap it in a proxy WSGI
+    exception and raise that::
+
+       abort(404)
+       abort(Response('Hello World'))
+
+    """
+    return _aborter(status, *args, **kwargs)
+
+
+_aborter = Aborter()
+
+
+#: an exception that is used internally to signal both a key error and a
+#: bad request.  Used by a lot of the datastructures.
+BadRequestKeyError = BadRequest.wrap(KeyError)
+
+# imported here because of circular dependencies of werkzeug.utils
+from .http import HTTP_STATUS_CODES
+from .utils import escape
diff --git a/venv/lib/python3.7/site-packages/werkzeug/filesystem.py b/venv/lib/python3.7/site-packages/werkzeug/filesystem.py
new file mode 100644
index 0000000..d016cae
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/filesystem.py
@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.filesystem
+    ~~~~~~~~~~~~~~~~~~~
+
+    Various utilities for the local filesystem.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import codecs
+import sys
+import warnings
+
+# We do not trust traditional unixes.
+has_likely_buggy_unicode_filesystem = (
+    sys.platform.startswith("linux") or "bsd" in sys.platform
+)
+
+
+def _is_ascii_encoding(encoding):
+    """Given an encoding this figures out if the encoding is actually ASCII (which
+    is something we don't actually want in most cases). This is necessary
+    because ASCII comes under many names such as ANSI_X3.4-1968.
+    """
+    if encoding is None:
+        return False
+    try:
+        return codecs.lookup(encoding).name == "ascii"
+    except LookupError:
+        return False
+
+
+class BrokenFilesystemWarning(RuntimeWarning, UnicodeWarning):
+    """The warning used by Werkzeug to signal a broken filesystem. Will only be
+    used once per runtime."""
+
+
+_warned_about_filesystem_encoding = False
+
+
+def get_filesystem_encoding():
+    """Returns the filesystem encoding that should be used. Note that this is
+    different from the Python understanding of the filesystem encoding which
+    might be deeply flawed. Do not use this value against Python's unicode APIs
+    because it might be different. See :ref:`filesystem-encoding` for the exact
+    behavior.
+
+    The concept of a filesystem encoding in generally is not something you
+    should rely on. As such if you ever need to use this function except for
+    writing wrapper code reconsider.
+    """
+    global _warned_about_filesystem_encoding
+    rv = sys.getfilesystemencoding()
+    if has_likely_buggy_unicode_filesystem and not rv or _is_ascii_encoding(rv):
+        if not _warned_about_filesystem_encoding:
+            warnings.warn(
+                "Detected a misconfigured UNIX filesystem: Will use"
+                " UTF-8 as filesystem encoding instead of {0!r}".format(rv),
+                BrokenFilesystemWarning,
+            )
+            _warned_about_filesystem_encoding = True
+        return "utf-8"
+    return rv
diff --git a/venv/lib/python3.7/site-packages/werkzeug/formparser.py b/venv/lib/python3.7/site-packages/werkzeug/formparser.py
new file mode 100644
index 0000000..0ddc5c8
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/formparser.py
@@ -0,0 +1,586 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.formparser
+    ~~~~~~~~~~~~~~~~~~~
+
+    This module implements the form parsing.  It supports url-encoded forms
+    as well as non-nested multipart uploads.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import codecs
+import re
+from functools import update_wrapper
+from itertools import chain
+from itertools import repeat
+from itertools import tee
+
+from ._compat import BytesIO
+from ._compat import text_type
+from ._compat import to_native
+from .datastructures import FileStorage
+from .datastructures import Headers
+from .datastructures import MultiDict
+from .http import parse_options_header
+from .urls import url_decode_stream
+from .wsgi import get_content_length
+from .wsgi import get_input_stream
+from .wsgi import make_line_iter
+
+# there are some platforms where SpooledTemporaryFile is not available.
+# In that case we need to provide a fallback.
+try:
+    from tempfile import SpooledTemporaryFile
+except ImportError:
+    from tempfile import TemporaryFile
+
+    SpooledTemporaryFile = None
+
+
+#: an iterator that yields empty strings
+_empty_string_iter = repeat("")
+
+#: a regular expression for multipart boundaries
+_multipart_boundary_re = re.compile("^[ -~]{0,200}[!-~]$")
+
+#: supported http encodings that are also available in python we support
+#: for multipart messages.
+_supported_multipart_encodings = frozenset(["base64", "quoted-printable"])
+
+
+def default_stream_factory(
+    total_content_length, filename, content_type, content_length=None
+):
+    """The stream factory that is used per default."""
+    max_size = 1024 * 500
+    if SpooledTemporaryFile is not None:
+        return SpooledTemporaryFile(max_size=max_size, mode="wb+")
+    if total_content_length is None or total_content_length > max_size:
+        return TemporaryFile("wb+")
+    return BytesIO()
+
+
+def parse_form_data(
+    environ,
+    stream_factory=None,
+    charset="utf-8",
+    errors="replace",
+    max_form_memory_size=None,
+    max_content_length=None,
+    cls=None,
+    silent=True,
+):
+    """Parse the form data in the environ and return it as tuple in the form
+    ``(stream, form, files)``.  You should only call this method if the
+    transport method is `POST`, `PUT`, or `PATCH`.
+
+    If the mimetype of the data transmitted is `multipart/form-data` the
+    files multidict will be filled with `FileStorage` objects.  If the
+    mimetype is unknown the input stream is wrapped and returned as first
+    argument, else the stream is empty.
+
+    This is a shortcut for the common usage of :class:`FormDataParser`.
+
+    Have a look at :ref:`dealing-with-request-data` for more details.
+
+    .. versionadded:: 0.5
+       The `max_form_memory_size`, `max_content_length` and
+       `cls` parameters were added.
+
+    .. versionadded:: 0.5.1
+       The optional `silent` flag was added.
+
+    :param environ: the WSGI environment to be used for parsing.
+    :param stream_factory: An optional callable that returns a new read and
+                           writeable file descriptor.  This callable works
+                           the same as :meth:`~BaseResponse._get_file_stream`.
+    :param charset: The character set for URL and url encoded form data.
+    :param errors: The encoding error behavior.
+    :param max_form_memory_size: the maximum number of bytes to be accepted for
+                           in-memory stored form data.  If the data
+                           exceeds the value specified an
+                           :exc:`~exceptions.RequestEntityTooLarge`
+                           exception is raised.
+    :param max_content_length: If this is provided and the transmitted data
+                               is longer than this value an
+                               :exc:`~exceptions.RequestEntityTooLarge`
+                               exception is raised.
+    :param cls: an optional dict class to use.  If this is not specified
+                       or `None` the default :class:`MultiDict` is used.
+    :param silent: If set to False parsing errors will not be caught.
+    :return: A tuple in the form ``(stream, form, files)``.
+    """
+    return FormDataParser(
+        stream_factory,
+        charset,
+        errors,
+        max_form_memory_size,
+        max_content_length,
+        cls,
+        silent,
+    ).parse_from_environ(environ)
+
+
+def exhaust_stream(f):
+    """Helper decorator for methods that exhausts the stream on return."""
+
+    def wrapper(self, stream, *args, **kwargs):
+        try:
+            return f(self, stream, *args, **kwargs)
+        finally:
+            exhaust = getattr(stream, "exhaust", None)
+            if exhaust is not None:
+                exhaust()
+            else:
+                while 1:
+                    chunk = stream.read(1024 * 64)
+                    if not chunk:
+                        break
+
+    return update_wrapper(wrapper, f)
+
+
+class FormDataParser(object):
+    """This class implements parsing of form data for Werkzeug.  By itself
+    it can parse multipart and url encoded form data.  It can be subclassed
+    and extended but for most mimetypes it is a better idea to use the
+    untouched stream and expose it as separate attributes on a request
+    object.
+
+    .. versionadded:: 0.8
+
+    :param stream_factory: An optional callable that returns a new read and
+                           writeable file descriptor.  This callable works
+                           the same as :meth:`~BaseResponse._get_file_stream`.
+    :param charset: The character set for URL and url encoded form data.
+    :param errors: The encoding error behavior.
+    :param max_form_memory_size: the maximum number of bytes to be accepted for
+                           in-memory stored form data.  If the data
+                           exceeds the value specified an
+                           :exc:`~exceptions.RequestEntityTooLarge`
+                           exception is raised.
+    :param max_content_length: If this is provided and the transmitted data
+                               is longer than this value an
+                               :exc:`~exceptions.RequestEntityTooLarge`
+                               exception is raised.
+    :param cls: an optional dict class to use.  If this is not specified
+                       or `None` the default :class:`MultiDict` is used.
+    :param silent: If set to False parsing errors will not be caught.
+    """
+
+    def __init__(
+        self,
+        stream_factory=None,
+        charset="utf-8",
+        errors="replace",
+        max_form_memory_size=None,
+        max_content_length=None,
+        cls=None,
+        silent=True,
+    ):
+        if stream_factory is None:
+            stream_factory = default_stream_factory
+        self.stream_factory = stream_factory
+        self.charset = charset
+        self.errors = errors
+        self.max_form_memory_size = max_form_memory_size
+        self.max_content_length = max_content_length
+        if cls is None:
+            cls = MultiDict
+        self.cls = cls
+        self.silent = silent
+
+    def get_parse_func(self, mimetype, options):
+        return self.parse_functions.get(mimetype)
+
+    def parse_from_environ(self, environ):
+        """Parses the information from the environment as form data.
+
+        :param environ: the WSGI environment to be used for parsing.
+        :return: A tuple in the form ``(stream, form, files)``.
+        """
+        content_type = environ.get("CONTENT_TYPE", "")
+        content_length = get_content_length(environ)
+        mimetype, options = parse_options_header(content_type)
+        return self.parse(get_input_stream(environ), mimetype, content_length, options)
+
+    def parse(self, stream, mimetype, content_length, options=None):
+        """Parses the information from the given stream, mimetype,
+        content length and mimetype parameters.
+
+        :param stream: an input stream
+        :param mimetype: the mimetype of the data
+        :param content_length: the content length of the incoming data
+        :param options: optional mimetype parameters (used for
+                        the multipart boundary for instance)
+        :return: A tuple in the form ``(stream, form, files)``.
+        """
+        if (
+            self.max_content_length is not None
+            and content_length is not None
+            and content_length > self.max_content_length
+        ):
+            raise exceptions.RequestEntityTooLarge()
+        if options is None:
+            options = {}
+
+        parse_func = self.get_parse_func(mimetype, options)
+        if parse_func is not None:
+            try:
+                return parse_func(self, stream, mimetype, content_length, options)
+            except ValueError:
+                if not self.silent:
+                    raise
+
+        return stream, self.cls(), self.cls()
+
+    @exhaust_stream
+    def _parse_multipart(self, stream, mimetype, content_length, options):
+        parser = MultiPartParser(
+            self.stream_factory,
+            self.charset,
+            self.errors,
+            max_form_memory_size=self.max_form_memory_size,
+            cls=self.cls,
+        )
+        boundary = options.get("boundary")
+        if boundary is None:
+            raise ValueError("Missing boundary")
+        if isinstance(boundary, text_type):
+            boundary = boundary.encode("ascii")
+        form, files = parser.parse(stream, boundary, content_length)
+        return stream, form, files
+
+    @exhaust_stream
+    def _parse_urlencoded(self, stream, mimetype, content_length, options):
+        if (
+            self.max_form_memory_size is not None
+            and content_length is not None
+            and content_length > self.max_form_memory_size
+        ):
+            raise exceptions.RequestEntityTooLarge()
+        form = url_decode_stream(stream, self.charset, errors=self.errors, cls=self.cls)
+        return stream, form, self.cls()
+
+    #: mapping of mimetypes to parsing functions
+    parse_functions = {
+        "multipart/form-data": _parse_multipart,
+        "application/x-www-form-urlencoded": _parse_urlencoded,
+        "application/x-url-encoded": _parse_urlencoded,
+    }
+
+
+def is_valid_multipart_boundary(boundary):
+    """Checks if the string given is a valid multipart boundary."""
+    return _multipart_boundary_re.match(boundary) is not None
+
+
+def _line_parse(line):
+    """Removes line ending characters and returns a tuple (`stripped_line`,
+    `is_terminated`).
+    """
+    if line[-2:] in ["\r\n", b"\r\n"]:
+        return line[:-2], True
+    elif line[-1:] in ["\r", "\n", b"\r", b"\n"]:
+        return line[:-1], True
+    return line, False
+
+
+def parse_multipart_headers(iterable):
+    """Parses multipart headers from an iterable that yields lines (including
+    the trailing newline symbol).  The iterable has to be newline terminated.
+
+    The iterable will stop at the line where the headers ended so it can be
+    further consumed.
+
+    :param iterable: iterable of strings that are newline terminated
+    """
+    result = []
+    for line in iterable:
+        line = to_native(line)
+        line, line_terminated = _line_parse(line)
+        if not line_terminated:
+            raise ValueError("unexpected end of line in multipart header")
+        if not line:
+            break
+        elif line[0] in " \t" and result:
+            key, value = result[-1]
+            result[-1] = (key, value + "\n " + line[1:])
+        else:
+            parts = line.split(":", 1)
+            if len(parts) == 2:
+                result.append((parts[0].strip(), parts[1].strip()))
+
+    # we link the list to the headers, no need to create a copy, the
+    # list was not shared anyways.
+    return Headers(result)
+
+
+_begin_form = "begin_form"
+_begin_file = "begin_file"
+_cont = "cont"
+_end = "end"
+
+
+class MultiPartParser(object):
+    def __init__(
+        self,
+        stream_factory=None,
+        charset="utf-8",
+        errors="replace",
+        max_form_memory_size=None,
+        cls=None,
+        buffer_size=64 * 1024,
+    ):
+        self.charset = charset
+        self.errors = errors
+        self.max_form_memory_size = max_form_memory_size
+        self.stream_factory = (
+            default_stream_factory if stream_factory is None else stream_factory
+        )
+        self.cls = MultiDict if cls is None else cls
+
+        # make sure the buffer size is divisible by four so that we can base64
+        # decode chunk by chunk
+        assert buffer_size % 4 == 0, "buffer size has to be divisible by 4"
+        # also the buffer size has to be at least 1024 bytes long or long headers
+        # will freak out the system
+        assert buffer_size >= 1024, "buffer size has to be at least 1KB"
+
+        self.buffer_size = buffer_size
+
+    def _fix_ie_filename(self, filename):
+        """Internet Explorer 6 transmits the full file name if a file is
+        uploaded.  This function strips the full path if it thinks the
+        filename is Windows-like absolute.
+        """
+        if filename[1:3] == ":\\" or filename[:2] == "\\\\":
+            return filename.split("\\")[-1]
+        return filename
+
+    def _find_terminator(self, iterator):
+        """The terminator might have some additional newlines before it.
+        There is at least one application that sends additional newlines
+        before headers (the python setuptools package).
+        """
+        for line in iterator:
+            if not line:
+                break
+            line = line.strip()
+            if line:
+                return line
+        return b""
+
+    def fail(self, message):
+        raise ValueError(message)
+
+    def get_part_encoding(self, headers):
+        transfer_encoding = headers.get("content-transfer-encoding")
+        if (
+            transfer_encoding is not None
+            and transfer_encoding in _supported_multipart_encodings
+        ):
+            return transfer_encoding
+
+    def get_part_charset(self, headers):
+        # Figure out input charset for current part
+        content_type = headers.get("content-type")
+        if content_type:
+            mimetype, ct_params = parse_options_header(content_type)
+            return ct_params.get("charset", self.charset)
+        return self.charset
+
+    def start_file_streaming(self, filename, headers, total_content_length):
+        if isinstance(filename, bytes):
+            filename = filename.decode(self.charset, self.errors)
+        filename = self._fix_ie_filename(filename)
+        content_type = headers.get("content-type")
+        try:
+            content_length = int(headers["content-length"])
+        except (KeyError, ValueError):
+            content_length = 0
+        container = self.stream_factory(
+            total_content_length=total_content_length,
+            filename=filename,
+            content_type=content_type,
+            content_length=content_length,
+        )
+        return filename, container
+
+    def in_memory_threshold_reached(self, bytes):
+        raise exceptions.RequestEntityTooLarge()
+
+    def validate_boundary(self, boundary):
+        if not boundary:
+            self.fail("Missing boundary")
+        if not is_valid_multipart_boundary(boundary):
+            self.fail("Invalid boundary: %s" % boundary)
+        if len(boundary) > self.buffer_size:  # pragma: no cover
+            # this should never happen because we check for a minimum size
+            # of 1024 and boundaries may not be longer than 200.  The only
+            # situation when this happens is for non debug builds where
+            # the assert is skipped.
+            self.fail("Boundary longer than buffer size")
+
+    def parse_lines(self, file, boundary, content_length, cap_at_buffer=True):
+        """Generate parts of
+        ``('begin_form', (headers, name))``
+        ``('begin_file', (headers, name, filename))``
+        ``('cont', bytestring)``
+        ``('end', None)``
+
+        Always obeys the grammar
+        parts = ( begin_form cont* end |
+                  begin_file cont* end )*
+        """
+        next_part = b"--" + boundary
+        last_part = next_part + b"--"
+
+        iterator = chain(
+            make_line_iter(
+                file,
+                limit=content_length,
+                buffer_size=self.buffer_size,
+                cap_at_buffer=cap_at_buffer,
+            ),
+            _empty_string_iter,
+        )
+
+        terminator = self._find_terminator(iterator)
+
+        if terminator == last_part:
+            return
+        elif terminator != next_part:
+            self.fail("Expected boundary at start of multipart data")
+
+        while terminator != last_part:
+            headers = parse_multipart_headers(iterator)
+
+            disposition = headers.get("content-disposition")
+            if disposition is None:
+                self.fail("Missing Content-Disposition header")
+            disposition, extra = parse_options_header(disposition)
+            transfer_encoding = self.get_part_encoding(headers)
+            name = extra.get("name")
+            filename = extra.get("filename")
+
+            # if no content type is given we stream into memory.  A list is
+            # used as a temporary container.
+            if filename is None:
+                yield _begin_form, (headers, name)
+
+            # otherwise we parse the rest of the headers and ask the stream
+            # factory for something we can write in.
+            else:
+                yield _begin_file, (headers, name, filename)
+
+            buf = b""
+            for line in iterator:
+                if not line:
+                    self.fail("unexpected end of stream")
+
+                if line[:2] == b"--":
+                    terminator = line.rstrip()
+                    if terminator in (next_part, last_part):
+                        break
+
+                if transfer_encoding is not None:
+                    if transfer_encoding == "base64":
+                        transfer_encoding = "base64_codec"
+                    try:
+                        line = codecs.decode(line, transfer_encoding)
+                    except Exception:
+                        self.fail("could not decode transfer encoded chunk")
+
+                # we have something in the buffer from the last iteration.
+                # this is usually a newline delimiter.
+                if buf:
+                    yield _cont, buf
+                    buf = b""
+
+                # If the line ends with windows CRLF we write everything except
+                # the last two bytes.  In all other cases however we write
+                # everything except the last byte.  If it was a newline, that's
+                # fine, otherwise it does not matter because we will write it
+                # the next iteration.  this ensures we do not write the
+                # final newline into the stream.  That way we do not have to
+                # truncate the stream.  However we do have to make sure that
+                # if something else than a newline is in there we write it
+                # out.
+                if line[-2:] == b"\r\n":
+                    buf = b"\r\n"
+                    cutoff = -2
+                else:
+                    buf = line[-1:]
+                    cutoff = -1
+                yield _cont, line[:cutoff]
+
+            else:  # pragma: no cover
+                raise ValueError("unexpected end of part")
+
+            # if we have a leftover in the buffer that is not a newline
+            # character we have to flush it, otherwise we will chop of
+            # certain values.
+            if buf not in (b"", b"\r", b"\n", b"\r\n"):
+                yield _cont, buf
+
+            yield _end, None
+
+    def parse_parts(self, file, boundary, content_length):
+        """Generate ``('file', (name, val))`` and
+        ``('form', (name, val))`` parts.
+        """
+        in_memory = 0
+
+        for ellt, ell in self.parse_lines(file, boundary, content_length):
+            if ellt == _begin_file:
+                headers, name, filename = ell
+                is_file = True
+                guard_memory = False
+                filename, container = self.start_file_streaming(
+                    filename, headers, content_length
+                )
+                _write = container.write
+
+            elif ellt == _begin_form:
+                headers, name = ell
+                is_file = False
+                container = []
+                _write = container.append
+                guard_memory = self.max_form_memory_size is not None
+
+            elif ellt == _cont:
+                _write(ell)
+                # if we write into memory and there is a memory size limit we
+                # count the number of bytes in memory and raise an exception if
+                # there is too much data in memory.
+                if guard_memory:
+                    in_memory += len(ell)
+                    if in_memory > self.max_form_memory_size:
+                        self.in_memory_threshold_reached(in_memory)
+
+            elif ellt == _end:
+                if is_file:
+                    container.seek(0)
+                    yield (
+                        "file",
+                        (name, FileStorage(container, filename, name, headers=headers)),
+                    )
+                else:
+                    part_charset = self.get_part_charset(headers)
+                    yield (
+                        "form",
+                        (name, b"".join(container).decode(part_charset, self.errors)),
+                    )
+
+    def parse(self, file, boundary, content_length):
+        formstream, filestream = tee(
+            self.parse_parts(file, boundary, content_length), 2
+        )
+        form = (p[1] for p in formstream if p[0] == "form")
+        files = (p[1] for p in filestream if p[0] == "file")
+        return self.cls(form), self.cls(files)
+
+
+from . import exceptions
diff --git a/venv/lib/python3.7/site-packages/werkzeug/http.py b/venv/lib/python3.7/site-packages/werkzeug/http.py
new file mode 100644
index 0000000..af32007
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/http.py
@@ -0,0 +1,1303 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.http
+    ~~~~~~~~~~~~~
+
+    Werkzeug comes with a bunch of utilities that help Werkzeug to deal with
+    HTTP data.  Most of the classes and functions provided by this module are
+    used by the wrappers, but they are useful on their own, too, especially if
+    the response and request objects are not used.
+
+    This covers some of the more HTTP centric features of WSGI, some other
+    utilities such as cookie handling are documented in the `werkzeug.utils`
+    module.
+
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import base64
+import re
+import warnings
+from datetime import datetime
+from datetime import timedelta
+from hashlib import md5
+from time import gmtime
+from time import time
+
+from ._compat import integer_types
+from ._compat import iteritems
+from ._compat import PY2
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import to_bytes
+from ._compat import to_unicode
+from ._compat import try_coerce_native
+from ._internal import _cookie_parse_impl
+from ._internal import _cookie_quote
+from ._internal import _make_cookie_domain
+
+try:
+    from email.utils import parsedate_tz
+except ImportError:
+    from email.Utils import parsedate_tz
+
+try:
+    from urllib.request import parse_http_list as _parse_list_header
+    from urllib.parse import unquote_to_bytes as _unquote
+except ImportError:
+    from urllib2 import parse_http_list as _parse_list_header
+    from urllib2 import unquote as _unquote
+
+_cookie_charset = "latin1"
+_basic_auth_charset = "utf-8"
+# for explanation of "media-range", etc. see Sections 5.3.{1,2} of RFC 7231
+_accept_re = re.compile(
+    r"""
+    (                       # media-range capturing-parenthesis
+      [^\s;,]+              # type/subtype
+      (?:[ \t]*;[ \t]*      # ";"
+        (?:                 # parameter non-capturing-parenthesis
+          [^\s;,q][^\s;,]*  # token that doesn't start with "q"
+        |                   # or
+          q[^\s;,=][^\s;,]* # token that is more than just "q"
+        )
+      )*                    # zero or more parameters
+    )                       # end of media-range
+    (?:[ \t]*;[ \t]*q=      # weight is a "q" parameter
+      (\d*(?:\.\d+)?)       # qvalue capturing-parentheses
+      [^,]*                 # "extension" accept params: who cares?
+    )?                      # accept params are optional
+    """,
+    re.VERBOSE,
+)
+_token_chars = frozenset(
+    "!#$%&'*+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ^_`abcdefghijklmnopqrstuvwxyz|~"
+)
+_etag_re = re.compile(r'([Ww]/)?(?:"(.*?)"|(.*?))(?:\s*,\s*|$)')
+_unsafe_header_chars = set('()<>@,;:"/[]?={} \t')
+_option_header_piece_re = re.compile(
+    r"""
+    ;\s*,?\s*  # newlines were replaced with commas
+    (?P
+        "[^"\\]*(?:\\.[^"\\]*)*"  # quoted string
+    |
+        [^\s;,=*]+  # token
+    )
+    (?:\*(?P\d+))?  # *1, optional continuation index
+    \s*
+    (?:  # optionally followed by =value
+        (?:  # equals sign, possibly with encoding
+            \*\s*=\s*  # * indicates extended notation
+            (?:  # optional encoding
+                (?P[^\s]+?)
+                '(?P[^\s]*?)'
+            )?
+        |
+            =\s*  # basic notation
+        )
+        (?P
+            "[^"\\]*(?:\\.[^"\\]*)*"  # quoted string
+        |
+            [^;,]+  # token
+        )?
+    )?
+    \s*
+    """,
+    flags=re.VERBOSE,
+)
+_option_header_start_mime_type = re.compile(r",\s*([^;,\s]+)([;,]\s*.+)?")
+
+_entity_headers = frozenset(
+    [
+        "allow",
+        "content-encoding",
+        "content-language",
+        "content-length",
+        "content-location",
+        "content-md5",
+        "content-range",
+        "content-type",
+        "expires",
+        "last-modified",
+    ]
+)
+_hop_by_hop_headers = frozenset(
+    [
+        "connection",
+        "keep-alive",
+        "proxy-authenticate",
+        "proxy-authorization",
+        "te",
+        "trailer",
+        "transfer-encoding",
+        "upgrade",
+    ]
+)
+
+
+HTTP_STATUS_CODES = {
+    100: "Continue",
+    101: "Switching Protocols",
+    102: "Processing",
+    200: "OK",
+    201: "Created",
+    202: "Accepted",
+    203: "Non Authoritative Information",
+    204: "No Content",
+    205: "Reset Content",
+    206: "Partial Content",
+    207: "Multi Status",
+    226: "IM Used",  # see RFC 3229
+    300: "Multiple Choices",
+    301: "Moved Permanently",
+    302: "Found",
+    303: "See Other",
+    304: "Not Modified",
+    305: "Use Proxy",
+    307: "Temporary Redirect",
+    308: "Permanent Redirect",
+    400: "Bad Request",
+    401: "Unauthorized",
+    402: "Payment Required",  # unused
+    403: "Forbidden",
+    404: "Not Found",
+    405: "Method Not Allowed",
+    406: "Not Acceptable",
+    407: "Proxy Authentication Required",
+    408: "Request Timeout",
+    409: "Conflict",
+    410: "Gone",
+    411: "Length Required",
+    412: "Precondition Failed",
+    413: "Request Entity Too Large",
+    414: "Request URI Too Long",
+    415: "Unsupported Media Type",
+    416: "Requested Range Not Satisfiable",
+    417: "Expectation Failed",
+    418: "I'm a teapot",  # see RFC 2324
+    421: "Misdirected Request",  # see RFC 7540
+    422: "Unprocessable Entity",
+    423: "Locked",
+    424: "Failed Dependency",
+    426: "Upgrade Required",
+    428: "Precondition Required",  # see RFC 6585
+    429: "Too Many Requests",
+    431: "Request Header Fields Too Large",
+    449: "Retry With",  # proprietary MS extension
+    451: "Unavailable For Legal Reasons",
+    500: "Internal Server Error",
+    501: "Not Implemented",
+    502: "Bad Gateway",
+    503: "Service Unavailable",
+    504: "Gateway Timeout",
+    505: "HTTP Version Not Supported",
+    507: "Insufficient Storage",
+    510: "Not Extended",
+}
+
+
+def wsgi_to_bytes(data):
+    """coerce wsgi unicode represented bytes to real ones"""
+    if isinstance(data, bytes):
+        return data
+    return data.encode("latin1")  # XXX: utf8 fallback?
+
+
+def bytes_to_wsgi(data):
+    assert isinstance(data, bytes), "data must be bytes"
+    if isinstance(data, str):
+        return data
+    else:
+        return data.decode("latin1")
+
+
+def quote_header_value(value, extra_chars="", allow_token=True):
+    """Quote a header value if necessary.
+
+    .. versionadded:: 0.5
+
+    :param value: the value to quote.
+    :param extra_chars: a list of extra characters to skip quoting.
+    :param allow_token: if this is enabled token values are returned
+                        unchanged.
+    """
+    if isinstance(value, bytes):
+        value = bytes_to_wsgi(value)
+    value = str(value)
+    if allow_token:
+        token_chars = _token_chars | set(extra_chars)
+        if set(value).issubset(token_chars):
+            return value
+    return '"%s"' % value.replace("\\", "\\\\").replace('"', '\\"')
+
+
+def unquote_header_value(value, is_filename=False):
+    r"""Unquotes a header value.  (Reversal of :func:`quote_header_value`).
+    This does not use the real unquoting but what browsers are actually
+    using for quoting.
+
+    .. versionadded:: 0.5
+
+    :param value: the header value to unquote.
+    """
+    if value and value[0] == value[-1] == '"':
+        # this is not the real unquoting, but fixing this so that the
+        # RFC is met will result in bugs with internet explorer and
+        # probably some other browsers as well.  IE for example is
+        # uploading files with "C:\foo\bar.txt" as filename
+        value = value[1:-1]
+
+        # if this is a filename and the starting characters look like
+        # a UNC path, then just return the value without quotes.  Using the
+        # replace sequence below on a UNC path has the effect of turning
+        # the leading double slash into a single slash and then
+        # _fix_ie_filename() doesn't work correctly.  See #458.
+        if not is_filename or value[:2] != "\\\\":
+            return value.replace("\\\\", "\\").replace('\\"', '"')
+    return value
+
+
+def dump_options_header(header, options):
+    """The reverse function to :func:`parse_options_header`.
+
+    :param header: the header to dump
+    :param options: a dict of options to append.
+    """
+    segments = []
+    if header is not None:
+        segments.append(header)
+    for key, value in iteritems(options):
+        if value is None:
+            segments.append(key)
+        else:
+            segments.append("%s=%s" % (key, quote_header_value(value)))
+    return "; ".join(segments)
+
+
+def dump_header(iterable, allow_token=True):
+    """Dump an HTTP header again.  This is the reversal of
+    :func:`parse_list_header`, :func:`parse_set_header` and
+    :func:`parse_dict_header`.  This also quotes strings that include an
+    equals sign unless you pass it as dict of key, value pairs.
+
+    >>> dump_header({'foo': 'bar baz'})
+    'foo="bar baz"'
+    >>> dump_header(('foo', 'bar baz'))
+    'foo, "bar baz"'
+
+    :param iterable: the iterable or dict of values to quote.
+    :param allow_token: if set to `False` tokens as values are disallowed.
+                        See :func:`quote_header_value` for more details.
+    """
+    if isinstance(iterable, dict):
+        items = []
+        for key, value in iteritems(iterable):
+            if value is None:
+                items.append(key)
+            else:
+                items.append(
+                    "%s=%s" % (key, quote_header_value(value, allow_token=allow_token))
+                )
+    else:
+        items = [quote_header_value(x, allow_token=allow_token) for x in iterable]
+    return ", ".join(items)
+
+
+def parse_list_header(value):
+    """Parse lists as described by RFC 2068 Section 2.
+
+    In particular, parse comma-separated lists where the elements of
+    the list may include quoted-strings.  A quoted-string could
+    contain a comma.  A non-quoted string could have quotes in the
+    middle.  Quotes are removed automatically after parsing.
+
+    It basically works like :func:`parse_set_header` just that items
+    may appear multiple times and case sensitivity is preserved.
+
+    The return value is a standard :class:`list`:
+
+    >>> parse_list_header('token, "quoted value"')
+    ['token', 'quoted value']
+
+    To create a header from the :class:`list` again, use the
+    :func:`dump_header` function.
+
+    :param value: a string with a list header.
+    :return: :class:`list`
+    """
+    result = []
+    for item in _parse_list_header(value):
+        if item[:1] == item[-1:] == '"':
+            item = unquote_header_value(item[1:-1])
+        result.append(item)
+    return result
+
+
+def parse_dict_header(value, cls=dict):
+    """Parse lists of key, value pairs as described by RFC 2068 Section 2 and
+    convert them into a python dict (or any other mapping object created from
+    the type with a dict like interface provided by the `cls` argument):
+
+    >>> d = parse_dict_header('foo="is a fish", bar="as well"')
+    >>> type(d) is dict
+    True
+    >>> sorted(d.items())
+    [('bar', 'as well'), ('foo', 'is a fish')]
+
+    If there is no value for a key it will be `None`:
+
+    >>> parse_dict_header('key_without_value')
+    {'key_without_value': None}
+
+    To create a header from the :class:`dict` again, use the
+    :func:`dump_header` function.
+
+    .. versionchanged:: 0.9
+       Added support for `cls` argument.
+
+    :param value: a string with a dict header.
+    :param cls: callable to use for storage of parsed results.
+    :return: an instance of `cls`
+    """
+    result = cls()
+    if not isinstance(value, text_type):
+        # XXX: validate
+        value = bytes_to_wsgi(value)
+    for item in _parse_list_header(value):
+        if "=" not in item:
+            result[item] = None
+            continue
+        name, value = item.split("=", 1)
+        if value[:1] == value[-1:] == '"':
+            value = unquote_header_value(value[1:-1])
+        result[name] = value
+    return result
+
+
+def parse_options_header(value, multiple=False):
+    """Parse a ``Content-Type`` like header into a tuple with the content
+    type and the options:
+
+    >>> parse_options_header('text/html; charset=utf8')
+    ('text/html', {'charset': 'utf8'})
+
+    This should not be used to parse ``Cache-Control`` like headers that use
+    a slightly different format.  For these headers use the
+    :func:`parse_dict_header` function.
+
+    .. versionchanged:: 0.15
+        :rfc:`2231` parameter continuations are handled.
+
+    .. versionadded:: 0.5
+
+    :param value: the header to parse.
+    :param multiple: Whether try to parse and return multiple MIME types
+    :return: (mimetype, options) or (mimetype, options, mimetype, options, …)
+             if multiple=True
+    """
+    if not value:
+        return "", {}
+
+    result = []
+
+    value = "," + value.replace("\n", ",")
+    while value:
+        match = _option_header_start_mime_type.match(value)
+        if not match:
+            break
+        result.append(match.group(1))  # mimetype
+        options = {}
+        # Parse options
+        rest = match.group(2)
+        continued_encoding = None
+        while rest:
+            optmatch = _option_header_piece_re.match(rest)
+            if not optmatch:
+                break
+            option, count, encoding, language, option_value = optmatch.groups()
+            # Continuations don't have to supply the encoding after the
+            # first line. If we're in a continuation, track the current
+            # encoding to use for subsequent lines. Reset it when the
+            # continuation ends.
+            if not count:
+                continued_encoding = None
+            else:
+                if not encoding:
+                    encoding = continued_encoding
+                continued_encoding = encoding
+            option = unquote_header_value(option)
+            if option_value is not None:
+                option_value = unquote_header_value(option_value, option == "filename")
+                if encoding is not None:
+                    option_value = _unquote(option_value).decode(encoding)
+            if count:
+                # Continuations append to the existing value. For
+                # simplicity, this ignores the possibility of
+                # out-of-order indices, which shouldn't happen anyway.
+                options[option] = options.get(option, "") + option_value
+            else:
+                options[option] = option_value
+            rest = rest[optmatch.end() :]
+        result.append(options)
+        if multiple is False:
+            return tuple(result)
+        value = rest
+
+    return tuple(result) if result else ("", {})
+
+
+def parse_accept_header(value, cls=None):
+    """Parses an HTTP Accept-* header.  This does not implement a complete
+    valid algorithm but one that supports at least value and quality
+    extraction.
+
+    Returns a new :class:`Accept` object (basically a list of ``(value, quality)``
+    tuples sorted by the quality with some additional accessor methods).
+
+    The second parameter can be a subclass of :class:`Accept` that is created
+    with the parsed values and returned.
+
+    :param value: the accept header string to be parsed.
+    :param cls: the wrapper class for the return value (can be
+                         :class:`Accept` or a subclass thereof)
+    :return: an instance of `cls`.
+    """
+    if cls is None:
+        cls = Accept
+
+    if not value:
+        return cls(None)
+
+    result = []
+    for match in _accept_re.finditer(value):
+        quality = match.group(2)
+        if not quality:
+            quality = 1
+        else:
+            quality = max(min(float(quality), 1), 0)
+        result.append((match.group(1), quality))
+    return cls(result)
+
+
+def parse_cache_control_header(value, on_update=None, cls=None):
+    """Parse a cache control header.  The RFC differs between response and
+    request cache control, this method does not.  It's your responsibility
+    to not use the wrong control statements.
+
+    .. versionadded:: 0.5
+       The `cls` was added.  If not specified an immutable
+       :class:`~werkzeug.datastructures.RequestCacheControl` is returned.
+
+    :param value: a cache control header to be parsed.
+    :param on_update: an optional callable that is called every time a value
+                      on the :class:`~werkzeug.datastructures.CacheControl`
+                      object is changed.
+    :param cls: the class for the returned object.  By default
+                :class:`~werkzeug.datastructures.RequestCacheControl` is used.
+    :return: a `cls` object.
+    """
+    if cls is None:
+        cls = RequestCacheControl
+    if not value:
+        return cls(None, on_update)
+    return cls(parse_dict_header(value), on_update)
+
+
+def parse_set_header(value, on_update=None):
+    """Parse a set-like header and return a
+    :class:`~werkzeug.datastructures.HeaderSet` object:
+
+    >>> hs = parse_set_header('token, "quoted value"')
+
+    The return value is an object that treats the items case-insensitively
+    and keeps the order of the items:
+
+    >>> 'TOKEN' in hs
+    True
+    >>> hs.index('quoted value')
+    1
+    >>> hs
+    HeaderSet(['token', 'quoted value'])
+
+    To create a header from the :class:`HeaderSet` again, use the
+    :func:`dump_header` function.
+
+    :param value: a set header to be parsed.
+    :param on_update: an optional callable that is called every time a
+                      value on the :class:`~werkzeug.datastructures.HeaderSet`
+                      object is changed.
+    :return: a :class:`~werkzeug.datastructures.HeaderSet`
+    """
+    if not value:
+        return HeaderSet(None, on_update)
+    return HeaderSet(parse_list_header(value), on_update)
+
+
+def parse_authorization_header(value):
+    """Parse an HTTP basic/digest authorization header transmitted by the web
+    browser.  The return value is either `None` if the header was invalid or
+    not given, otherwise an :class:`~werkzeug.datastructures.Authorization`
+    object.
+
+    :param value: the authorization header to parse.
+    :return: a :class:`~werkzeug.datastructures.Authorization` object or `None`.
+    """
+    if not value:
+        return
+    value = wsgi_to_bytes(value)
+    try:
+        auth_type, auth_info = value.split(None, 1)
+        auth_type = auth_type.lower()
+    except ValueError:
+        return
+    if auth_type == b"basic":
+        try:
+            username, password = base64.b64decode(auth_info).split(b":", 1)
+        except Exception:
+            return
+        return Authorization(
+            "basic",
+            {
+                "username": to_unicode(username, _basic_auth_charset),
+                "password": to_unicode(password, _basic_auth_charset),
+            },
+        )
+    elif auth_type == b"digest":
+        auth_map = parse_dict_header(auth_info)
+        for key in "username", "realm", "nonce", "uri", "response":
+            if key not in auth_map:
+                return
+        if "qop" in auth_map:
+            if not auth_map.get("nc") or not auth_map.get("cnonce"):
+                return
+        return Authorization("digest", auth_map)
+
+
+def parse_www_authenticate_header(value, on_update=None):
+    """Parse an HTTP WWW-Authenticate header into a
+    :class:`~werkzeug.datastructures.WWWAuthenticate` object.
+
+    :param value: a WWW-Authenticate header to parse.
+    :param on_update: an optional callable that is called every time a value
+                      on the :class:`~werkzeug.datastructures.WWWAuthenticate`
+                      object is changed.
+    :return: a :class:`~werkzeug.datastructures.WWWAuthenticate` object.
+    """
+    if not value:
+        return WWWAuthenticate(on_update=on_update)
+    try:
+        auth_type, auth_info = value.split(None, 1)
+        auth_type = auth_type.lower()
+    except (ValueError, AttributeError):
+        return WWWAuthenticate(value.strip().lower(), on_update=on_update)
+    return WWWAuthenticate(auth_type, parse_dict_header(auth_info), on_update)
+
+
+def parse_if_range_header(value):
+    """Parses an if-range header which can be an etag or a date.  Returns
+    a :class:`~werkzeug.datastructures.IfRange` object.
+
+    .. versionadded:: 0.7
+    """
+    if not value:
+        return IfRange()
+    date = parse_date(value)
+    if date is not None:
+        return IfRange(date=date)
+    # drop weakness information
+    return IfRange(unquote_etag(value)[0])
+
+
+def parse_range_header(value, make_inclusive=True):
+    """Parses a range header into a :class:`~werkzeug.datastructures.Range`
+    object.  If the header is missing or malformed `None` is returned.
+    `ranges` is a list of ``(start, stop)`` tuples where the ranges are
+    non-inclusive.
+
+    .. versionadded:: 0.7
+    """
+    if not value or "=" not in value:
+        return None
+
+    ranges = []
+    last_end = 0
+    units, rng = value.split("=", 1)
+    units = units.strip().lower()
+
+    for item in rng.split(","):
+        item = item.strip()
+        if "-" not in item:
+            return None
+        if item.startswith("-"):
+            if last_end < 0:
+                return None
+            try:
+                begin = int(item)
+            except ValueError:
+                return None
+            end = None
+            last_end = -1
+        elif "-" in item:
+            begin, end = item.split("-", 1)
+            begin = begin.strip()
+            end = end.strip()
+            if not begin.isdigit():
+                return None
+            begin = int(begin)
+            if begin < last_end or last_end < 0:
+                return None
+            if end:
+                if not end.isdigit():
+                    return None
+                end = int(end) + 1
+                if begin >= end:
+                    return None
+            else:
+                end = None
+            last_end = end
+        ranges.append((begin, end))
+
+    return Range(units, ranges)
+
+
+def parse_content_range_header(value, on_update=None):
+    """Parses a range header into a
+    :class:`~werkzeug.datastructures.ContentRange` object or `None` if
+    parsing is not possible.
+
+    .. versionadded:: 0.7
+
+    :param value: a content range header to be parsed.
+    :param on_update: an optional callable that is called every time a value
+                      on the :class:`~werkzeug.datastructures.ContentRange`
+                      object is changed.
+    """
+    if value is None:
+        return None
+    try:
+        units, rangedef = (value or "").strip().split(None, 1)
+    except ValueError:
+        return None
+
+    if "/" not in rangedef:
+        return None
+    rng, length = rangedef.split("/", 1)
+    if length == "*":
+        length = None
+    elif length.isdigit():
+        length = int(length)
+    else:
+        return None
+
+    if rng == "*":
+        return ContentRange(units, None, None, length, on_update=on_update)
+    elif "-" not in rng:
+        return None
+
+    start, stop = rng.split("-", 1)
+    try:
+        start = int(start)
+        stop = int(stop) + 1
+    except ValueError:
+        return None
+
+    if is_byte_range_valid(start, stop, length):
+        return ContentRange(units, start, stop, length, on_update=on_update)
+
+
+def quote_etag(etag, weak=False):
+    """Quote an etag.
+
+    :param etag: the etag to quote.
+    :param weak: set to `True` to tag it "weak".
+    """
+    if '"' in etag:
+        raise ValueError("invalid etag")
+    etag = '"%s"' % etag
+    if weak:
+        etag = "W/" + etag
+    return etag
+
+
+def unquote_etag(etag):
+    """Unquote a single etag:
+
+    >>> unquote_etag('W/"bar"')
+    ('bar', True)
+    >>> unquote_etag('"bar"')
+    ('bar', False)
+
+    :param etag: the etag identifier to unquote.
+    :return: a ``(etag, weak)`` tuple.
+    """
+    if not etag:
+        return None, None
+    etag = etag.strip()
+    weak = False
+    if etag.startswith(("W/", "w/")):
+        weak = True
+        etag = etag[2:]
+    if etag[:1] == etag[-1:] == '"':
+        etag = etag[1:-1]
+    return etag, weak
+
+
+def parse_etags(value):
+    """Parse an etag header.
+
+    :param value: the tag header to parse
+    :return: an :class:`~werkzeug.datastructures.ETags` object.
+    """
+    if not value:
+        return ETags()
+    strong = []
+    weak = []
+    end = len(value)
+    pos = 0
+    while pos < end:
+        match = _etag_re.match(value, pos)
+        if match is None:
+            break
+        is_weak, quoted, raw = match.groups()
+        if raw == "*":
+            return ETags(star_tag=True)
+        elif quoted:
+            raw = quoted
+        if is_weak:
+            weak.append(raw)
+        else:
+            strong.append(raw)
+        pos = match.end()
+    return ETags(strong, weak)
+
+
+def generate_etag(data):
+    """Generate an etag for some data."""
+    return md5(data).hexdigest()
+
+
+def parse_date(value):
+    """Parse one of the following date formats into a datetime object:
+
+    .. sourcecode:: text
+
+        Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 822, updated by RFC 1123
+        Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
+        Sun Nov  6 08:49:37 1994       ; ANSI C's asctime() format
+
+    If parsing fails the return value is `None`.
+
+    :param value: a string with a supported date format.
+    :return: a :class:`datetime.datetime` object.
+    """
+    if value:
+        t = parsedate_tz(value.strip())
+        if t is not None:
+            try:
+                year = t[0]
+                # unfortunately that function does not tell us if two digit
+                # years were part of the string, or if they were prefixed
+                # with two zeroes.  So what we do is to assume that 69-99
+                # refer to 1900, and everything below to 2000
+                if year >= 0 and year <= 68:
+                    year += 2000
+                elif year >= 69 and year <= 99:
+                    year += 1900
+                return datetime(*((year,) + t[1:7])) - timedelta(seconds=t[-1] or 0)
+            except (ValueError, OverflowError):
+                return None
+
+
+def _dump_date(d, delim):
+    """Used for `http_date` and `cookie_date`."""
+    if d is None:
+        d = gmtime()
+    elif isinstance(d, datetime):
+        d = d.utctimetuple()
+    elif isinstance(d, (integer_types, float)):
+        d = gmtime(d)
+    return "%s, %02d%s%s%s%s %02d:%02d:%02d GMT" % (
+        ("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun")[d.tm_wday],
+        d.tm_mday,
+        delim,
+        (
+            "Jan",
+            "Feb",
+            "Mar",
+            "Apr",
+            "May",
+            "Jun",
+            "Jul",
+            "Aug",
+            "Sep",
+            "Oct",
+            "Nov",
+            "Dec",
+        )[d.tm_mon - 1],
+        delim,
+        str(d.tm_year),
+        d.tm_hour,
+        d.tm_min,
+        d.tm_sec,
+    )
+
+
+def cookie_date(expires=None):
+    """Formats the time to ensure compatibility with Netscape's cookie
+    standard.
+
+    Accepts a floating point number expressed in seconds since the epoch in, a
+    datetime object or a timetuple.  All times in UTC.  The :func:`parse_date`
+    function can be used to parse such a date.
+
+    Outputs a string in the format ``Wdy, DD-Mon-YYYY HH:MM:SS GMT``.
+
+    :param expires: If provided that date is used, otherwise the current.
+    """
+    return _dump_date(expires, "-")
+
+
+def http_date(timestamp=None):
+    """Formats the time to match the RFC1123 date format.
+
+    Accepts a floating point number expressed in seconds since the epoch in, a
+    datetime object or a timetuple.  All times in UTC.  The :func:`parse_date`
+    function can be used to parse such a date.
+
+    Outputs a string in the format ``Wdy, DD Mon YYYY HH:MM:SS GMT``.
+
+    :param timestamp: If provided that date is used, otherwise the current.
+    """
+    return _dump_date(timestamp, " ")
+
+
+def parse_age(value=None):
+    """Parses a base-10 integer count of seconds into a timedelta.
+
+    If parsing fails, the return value is `None`.
+
+    :param value: a string consisting of an integer represented in base-10
+    :return: a :class:`datetime.timedelta` object or `None`.
+    """
+    if not value:
+        return None
+    try:
+        seconds = int(value)
+    except ValueError:
+        return None
+    if seconds < 0:
+        return None
+    try:
+        return timedelta(seconds=seconds)
+    except OverflowError:
+        return None
+
+
+def dump_age(age=None):
+    """Formats the duration as a base-10 integer.
+
+    :param age: should be an integer number of seconds,
+                a :class:`datetime.timedelta` object, or,
+                if the age is unknown, `None` (default).
+    """
+    if age is None:
+        return
+    if isinstance(age, timedelta):
+        # do the equivalent of Python 2.7's timedelta.total_seconds(),
+        # but disregarding fractional seconds
+        age = age.seconds + (age.days * 24 * 3600)
+
+    age = int(age)
+    if age < 0:
+        raise ValueError("age cannot be negative")
+
+    return str(age)
+
+
+def is_resource_modified(
+    environ, etag=None, data=None, last_modified=None, ignore_if_range=True
+):
+    """Convenience method for conditional requests.
+
+    :param environ: the WSGI environment of the request to be checked.
+    :param etag: the etag for the response for comparison.
+    :param data: or alternatively the data of the response to automatically
+                 generate an etag using :func:`generate_etag`.
+    :param last_modified: an optional date of the last modification.
+    :param ignore_if_range: If `False`, `If-Range` header will be taken into
+                            account.
+    :return: `True` if the resource was modified, otherwise `False`.
+    """
+    if etag is None and data is not None:
+        etag = generate_etag(data)
+    elif data is not None:
+        raise TypeError("both data and etag given")
+    if environ["REQUEST_METHOD"] not in ("GET", "HEAD"):
+        return False
+
+    unmodified = False
+    if isinstance(last_modified, string_types):
+        last_modified = parse_date(last_modified)
+
+    # ensure that microsecond is zero because the HTTP spec does not transmit
+    # that either and we might have some false positives.  See issue #39
+    if last_modified is not None:
+        last_modified = last_modified.replace(microsecond=0)
+
+    if_range = None
+    if not ignore_if_range and "HTTP_RANGE" in environ:
+        # https://tools.ietf.org/html/rfc7233#section-3.2
+        # A server MUST ignore an If-Range header field received in a request
+        # that does not contain a Range header field.
+        if_range = parse_if_range_header(environ.get("HTTP_IF_RANGE"))
+
+    if if_range is not None and if_range.date is not None:
+        modified_since = if_range.date
+    else:
+        modified_since = parse_date(environ.get("HTTP_IF_MODIFIED_SINCE"))
+
+    if modified_since and last_modified and last_modified <= modified_since:
+        unmodified = True
+
+    if etag:
+        etag, _ = unquote_etag(etag)
+        if if_range is not None and if_range.etag is not None:
+            unmodified = parse_etags(if_range.etag).contains(etag)
+        else:
+            if_none_match = parse_etags(environ.get("HTTP_IF_NONE_MATCH"))
+            if if_none_match:
+                # https://tools.ietf.org/html/rfc7232#section-3.2
+                # "A recipient MUST use the weak comparison function when comparing
+                # entity-tags for If-None-Match"
+                unmodified = if_none_match.contains_weak(etag)
+
+            # https://tools.ietf.org/html/rfc7232#section-3.1
+            # "Origin server MUST use the strong comparison function when
+            # comparing entity-tags for If-Match"
+            if_match = parse_etags(environ.get("HTTP_IF_MATCH"))
+            if if_match:
+                unmodified = not if_match.is_strong(etag)
+
+    return not unmodified
+
+
+def remove_entity_headers(headers, allowed=("expires", "content-location")):
+    """Remove all entity headers from a list or :class:`Headers` object.  This
+    operation works in-place.  `Expires` and `Content-Location` headers are
+    by default not removed.  The reason for this is :rfc:`2616` section
+    10.3.5 which specifies some entity headers that should be sent.
+
+    .. versionchanged:: 0.5
+       added `allowed` parameter.
+
+    :param headers: a list or :class:`Headers` object.
+    :param allowed: a list of headers that should still be allowed even though
+                    they are entity headers.
+    """
+    allowed = set(x.lower() for x in allowed)
+    headers[:] = [
+        (key, value)
+        for key, value in headers
+        if not is_entity_header(key) or key.lower() in allowed
+    ]
+
+
+def remove_hop_by_hop_headers(headers):
+    """Remove all HTTP/1.1 "Hop-by-Hop" headers from a list or
+    :class:`Headers` object.  This operation works in-place.
+
+    .. versionadded:: 0.5
+
+    :param headers: a list or :class:`Headers` object.
+    """
+    headers[:] = [
+        (key, value) for key, value in headers if not is_hop_by_hop_header(key)
+    ]
+
+
+def is_entity_header(header):
+    """Check if a header is an entity header.
+
+    .. versionadded:: 0.5
+
+    :param header: the header to test.
+    :return: `True` if it's an entity header, `False` otherwise.
+    """
+    return header.lower() in _entity_headers
+
+
+def is_hop_by_hop_header(header):
+    """Check if a header is an HTTP/1.1 "Hop-by-Hop" header.
+
+    .. versionadded:: 0.5
+
+    :param header: the header to test.
+    :return: `True` if it's an HTTP/1.1 "Hop-by-Hop" header, `False` otherwise.
+    """
+    return header.lower() in _hop_by_hop_headers
+
+
+def parse_cookie(header, charset="utf-8", errors="replace", cls=None):
+    """Parse a cookie.  Either from a string or WSGI environ.
+
+    Per default encoding errors are ignored.  If you want a different behavior
+    you can set `errors` to ``'replace'`` or ``'strict'``.  In strict mode a
+    :exc:`HTTPUnicodeError` is raised.
+
+    .. versionchanged:: 0.5
+       This function now returns a :class:`TypeConversionDict` instead of a
+       regular dict.  The `cls` parameter was added.
+
+    :param header: the header to be used to parse the cookie.  Alternatively
+                   this can be a WSGI environment.
+    :param charset: the charset for the cookie values.
+    :param errors: the error behavior for the charset decoding.
+    :param cls: an optional dict class to use.  If this is not specified
+                       or `None` the default :class:`TypeConversionDict` is
+                       used.
+    """
+    if isinstance(header, dict):
+        header = header.get("HTTP_COOKIE", "")
+    elif header is None:
+        header = ""
+
+    # If the value is an unicode string it's mangled through latin1.  This
+    # is done because on PEP 3333 on Python 3 all headers are assumed latin1
+    # which however is incorrect for cookies, which are sent in page encoding.
+    # As a result we
+    if isinstance(header, text_type):
+        header = header.encode("latin1", "replace")
+
+    if cls is None:
+        cls = TypeConversionDict
+
+    def _parse_pairs():
+        for key, val in _cookie_parse_impl(header):
+            key = to_unicode(key, charset, errors, allow_none_charset=True)
+            if not key:
+                continue
+            val = to_unicode(val, charset, errors, allow_none_charset=True)
+            yield try_coerce_native(key), val
+
+    return cls(_parse_pairs())
+
+
+def dump_cookie(
+    key,
+    value="",
+    max_age=None,
+    expires=None,
+    path="/",
+    domain=None,
+    secure=False,
+    httponly=False,
+    charset="utf-8",
+    sync_expires=True,
+    max_size=4093,
+    samesite=None,
+):
+    """Creates a new Set-Cookie header without the ``Set-Cookie`` prefix
+    The parameters are the same as in the cookie Morsel object in the
+    Python standard library but it accepts unicode data, too.
+
+    On Python 3 the return value of this function will be a unicode
+    string, on Python 2 it will be a native string.  In both cases the
+    return value is usually restricted to ascii as the vast majority of
+    values are properly escaped, but that is no guarantee.  If a unicode
+    string is returned it's tunneled through latin1 as required by
+    PEP 3333.
+
+    The return value is not ASCII safe if the key contains unicode
+    characters.  This is technically against the specification but
+    happens in the wild.  It's strongly recommended to not use
+    non-ASCII values for the keys.
+
+    :param max_age: should be a number of seconds, or `None` (default) if
+                    the cookie should last only as long as the client's
+                    browser session.  Additionally `timedelta` objects
+                    are accepted, too.
+    :param expires: should be a `datetime` object or unix timestamp.
+    :param path: limits the cookie to a given path, per default it will
+                 span the whole domain.
+    :param domain: Use this if you want to set a cross-domain cookie. For
+                   example, ``domain=".example.com"`` will set a cookie
+                   that is readable by the domain ``www.example.com``,
+                   ``foo.example.com`` etc. Otherwise, a cookie will only
+                   be readable by the domain that set it.
+    :param secure: The cookie will only be available via HTTPS
+    :param httponly: disallow JavaScript to access the cookie.  This is an
+                     extension to the cookie standard and probably not
+                     supported by all browsers.
+    :param charset: the encoding for unicode values.
+    :param sync_expires: automatically set expires if max_age is defined
+                         but expires not.
+    :param max_size: Warn if the final header value exceeds this size. The
+        default, 4093, should be safely `supported by most browsers
+        `_. Set to 0 to disable this check.
+    :param samesite: Limits the scope of the cookie such that it will only
+                     be attached to requests if those requests are "same-site".
+
+    .. _`cookie`: http://browsercookielimits.squawky.net/
+    """
+    key = to_bytes(key, charset)
+    value = to_bytes(value, charset)
+
+    if path is not None:
+        path = iri_to_uri(path, charset)
+    domain = _make_cookie_domain(domain)
+    if isinstance(max_age, timedelta):
+        max_age = (max_age.days * 60 * 60 * 24) + max_age.seconds
+    if expires is not None:
+        if not isinstance(expires, string_types):
+            expires = cookie_date(expires)
+    elif max_age is not None and sync_expires:
+        expires = to_bytes(cookie_date(time() + max_age))
+
+    samesite = samesite.title() if samesite else None
+    if samesite not in ("Strict", "Lax", None):
+        raise ValueError("invalid SameSite value; must be 'Strict', 'Lax' or None")
+
+    buf = [key + b"=" + _cookie_quote(value)]
+
+    # XXX: In theory all of these parameters that are not marked with `None`
+    # should be quoted.  Because stdlib did not quote it before I did not
+    # want to introduce quoting there now.
+    for k, v, q in (
+        (b"Domain", domain, True),
+        (b"Expires", expires, False),
+        (b"Max-Age", max_age, False),
+        (b"Secure", secure, None),
+        (b"HttpOnly", httponly, None),
+        (b"Path", path, False),
+        (b"SameSite", samesite, False),
+    ):
+        if q is None:
+            if v:
+                buf.append(k)
+            continue
+
+        if v is None:
+            continue
+
+        tmp = bytearray(k)
+        if not isinstance(v, (bytes, bytearray)):
+            v = to_bytes(text_type(v), charset)
+        if q:
+            v = _cookie_quote(v)
+        tmp += b"=" + v
+        buf.append(bytes(tmp))
+
+    # The return value will be an incorrectly encoded latin1 header on
+    # Python 3 for consistency with the headers object and a bytestring
+    # on Python 2 because that's how the API makes more sense.
+    rv = b"; ".join(buf)
+    if not PY2:
+        rv = rv.decode("latin1")
+
+    # Warn if the final value of the cookie is less than the limit. If the
+    # cookie is too large, then it may be silently ignored, which can be quite
+    # hard to debug.
+    cookie_size = len(rv)
+
+    if max_size and cookie_size > max_size:
+        value_size = len(value)
+        warnings.warn(
+            'The "{key}" cookie is too large: the value was {value_size} bytes'
+            " but the header required {extra_size} extra bytes. The final size"
+            " was {cookie_size} bytes but the limit is {max_size} bytes."
+            " Browsers may silently ignore cookies larger than this.".format(
+                key=key,
+                value_size=value_size,
+                extra_size=cookie_size - value_size,
+                cookie_size=cookie_size,
+                max_size=max_size,
+            ),
+            stacklevel=2,
+        )
+
+    return rv
+
+
+def is_byte_range_valid(start, stop, length):
+    """Checks if a given byte content range is valid for the given length.
+
+    .. versionadded:: 0.7
+    """
+    if (start is None) != (stop is None):
+        return False
+    elif start is None:
+        return length is None or length >= 0
+    elif length is None:
+        return 0 <= start < stop
+    elif start >= stop:
+        return False
+    return 0 <= start < length
+
+
+# circular dependency fun
+from .datastructures import Accept
+from .datastructures import Authorization
+from .datastructures import ContentRange
+from .datastructures import ETags
+from .datastructures import HeaderSet
+from .datastructures import IfRange
+from .datastructures import Range
+from .datastructures import RequestCacheControl
+from .datastructures import TypeConversionDict
+from .datastructures import WWWAuthenticate
+from .urls import iri_to_uri
+
+# DEPRECATED
+from .datastructures import CharsetAccept as _CharsetAccept
+from .datastructures import Headers as _Headers
+from .datastructures import LanguageAccept as _LanguageAccept
+from .datastructures import MIMEAccept as _MIMEAccept
+
+
+class MIMEAccept(_MIMEAccept):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.http.MIMEAccept' has moved to 'werkzeug"
+            ".datastructures.MIMEAccept' as of version 0.5. This old"
+            " import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(MIMEAccept, self).__init__(*args, **kwargs)
+
+
+class CharsetAccept(_CharsetAccept):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.http.CharsetAccept' has moved to 'werkzeug"
+            ".datastructures.CharsetAccept' as of version 0.5. This old"
+            " import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(CharsetAccept, self).__init__(*args, **kwargs)
+
+
+class LanguageAccept(_LanguageAccept):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.http.LanguageAccept' has moved to 'werkzeug"
+            ".datastructures.LanguageAccept' as of version 0.5. This"
+            " old import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(LanguageAccept, self).__init__(*args, **kwargs)
+
+
+class Headers(_Headers):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.http.Headers' has moved to 'werkzeug"
+            ".datastructures.Headers' as of version 0.5. This old"
+            " import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(Headers, self).__init__(*args, **kwargs)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/local.py b/venv/lib/python3.7/site-packages/werkzeug/local.py
new file mode 100644
index 0000000..9a6088c
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/local.py
@@ -0,0 +1,421 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.local
+    ~~~~~~~~~~~~~~
+
+    This module implements context-local objects.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import copy
+from functools import update_wrapper
+
+from ._compat import implements_bool
+from ._compat import PY2
+from .wsgi import ClosingIterator
+
+# since each thread has its own greenlet we can just use those as identifiers
+# for the context.  If greenlets are not available we fall back to the
+# current thread ident depending on where it is.
+try:
+    from greenlet import getcurrent as get_ident
+except ImportError:
+    try:
+        from thread import get_ident
+    except ImportError:
+        from _thread import get_ident
+
+
+def release_local(local):
+    """Releases the contents of the local for the current context.
+    This makes it possible to use locals without a manager.
+
+    Example::
+
+        >>> loc = Local()
+        >>> loc.foo = 42
+        >>> release_local(loc)
+        >>> hasattr(loc, 'foo')
+        False
+
+    With this function one can release :class:`Local` objects as well
+    as :class:`LocalStack` objects.  However it is not possible to
+    release data held by proxies that way, one always has to retain
+    a reference to the underlying local object in order to be able
+    to release it.
+
+    .. versionadded:: 0.6.1
+    """
+    local.__release_local__()
+
+
+class Local(object):
+    __slots__ = ("__storage__", "__ident_func__")
+
+    def __init__(self):
+        object.__setattr__(self, "__storage__", {})
+        object.__setattr__(self, "__ident_func__", get_ident)
+
+    def __iter__(self):
+        return iter(self.__storage__.items())
+
+    def __call__(self, proxy):
+        """Create a proxy for a name."""
+        return LocalProxy(self, proxy)
+
+    def __release_local__(self):
+        self.__storage__.pop(self.__ident_func__(), None)
+
+    def __getattr__(self, name):
+        try:
+            return self.__storage__[self.__ident_func__()][name]
+        except KeyError:
+            raise AttributeError(name)
+
+    def __setattr__(self, name, value):
+        ident = self.__ident_func__()
+        storage = self.__storage__
+        try:
+            storage[ident][name] = value
+        except KeyError:
+            storage[ident] = {name: value}
+
+    def __delattr__(self, name):
+        try:
+            del self.__storage__[self.__ident_func__()][name]
+        except KeyError:
+            raise AttributeError(name)
+
+
+class LocalStack(object):
+    """This class works similar to a :class:`Local` but keeps a stack
+    of objects instead.  This is best explained with an example::
+
+        >>> ls = LocalStack()
+        >>> ls.push(42)
+        >>> ls.top
+        42
+        >>> ls.push(23)
+        >>> ls.top
+        23
+        >>> ls.pop()
+        23
+        >>> ls.top
+        42
+
+    They can be force released by using a :class:`LocalManager` or with
+    the :func:`release_local` function but the correct way is to pop the
+    item from the stack after using.  When the stack is empty it will
+    no longer be bound to the current context (and as such released).
+
+    By calling the stack without arguments it returns a proxy that resolves to
+    the topmost item on the stack.
+
+    .. versionadded:: 0.6.1
+    """
+
+    def __init__(self):
+        self._local = Local()
+
+    def __release_local__(self):
+        self._local.__release_local__()
+
+    def _get__ident_func__(self):
+        return self._local.__ident_func__
+
+    def _set__ident_func__(self, value):
+        object.__setattr__(self._local, "__ident_func__", value)
+
+    __ident_func__ = property(_get__ident_func__, _set__ident_func__)
+    del _get__ident_func__, _set__ident_func__
+
+    def __call__(self):
+        def _lookup():
+            rv = self.top
+            if rv is None:
+                raise RuntimeError("object unbound")
+            return rv
+
+        return LocalProxy(_lookup)
+
+    def push(self, obj):
+        """Pushes a new item to the stack"""
+        rv = getattr(self._local, "stack", None)
+        if rv is None:
+            self._local.stack = rv = []
+        rv.append(obj)
+        return rv
+
+    def pop(self):
+        """Removes the topmost item from the stack, will return the
+        old value or `None` if the stack was already empty.
+        """
+        stack = getattr(self._local, "stack", None)
+        if stack is None:
+            return None
+        elif len(stack) == 1:
+            release_local(self._local)
+            return stack[-1]
+        else:
+            return stack.pop()
+
+    @property
+    def top(self):
+        """The topmost item on the stack.  If the stack is empty,
+        `None` is returned.
+        """
+        try:
+            return self._local.stack[-1]
+        except (AttributeError, IndexError):
+            return None
+
+
+class LocalManager(object):
+    """Local objects cannot manage themselves. For that you need a local
+    manager.  You can pass a local manager multiple locals or add them later
+    by appending them to `manager.locals`.  Every time the manager cleans up,
+    it will clean up all the data left in the locals for this context.
+
+    The `ident_func` parameter can be added to override the default ident
+    function for the wrapped locals.
+
+    .. versionchanged:: 0.6.1
+       Instead of a manager the :func:`release_local` function can be used
+       as well.
+
+    .. versionchanged:: 0.7
+       `ident_func` was added.
+    """
+
+    def __init__(self, locals=None, ident_func=None):
+        if locals is None:
+            self.locals = []
+        elif isinstance(locals, Local):
+            self.locals = [locals]
+        else:
+            self.locals = list(locals)
+        if ident_func is not None:
+            self.ident_func = ident_func
+            for local in self.locals:
+                object.__setattr__(local, "__ident_func__", ident_func)
+        else:
+            self.ident_func = get_ident
+
+    def get_ident(self):
+        """Return the context identifier the local objects use internally for
+        this context.  You cannot override this method to change the behavior
+        but use it to link other context local objects (such as SQLAlchemy's
+        scoped sessions) to the Werkzeug locals.
+
+        .. versionchanged:: 0.7
+           You can pass a different ident function to the local manager that
+           will then be propagated to all the locals passed to the
+           constructor.
+        """
+        return self.ident_func()
+
+    def cleanup(self):
+        """Manually clean up the data in the locals for this context.  Call
+        this at the end of the request or use `make_middleware()`.
+        """
+        for local in self.locals:
+            release_local(local)
+
+    def make_middleware(self, app):
+        """Wrap a WSGI application so that cleaning up happens after
+        request end.
+        """
+
+        def application(environ, start_response):
+            return ClosingIterator(app(environ, start_response), self.cleanup)
+
+        return application
+
+    def middleware(self, func):
+        """Like `make_middleware` but for decorating functions.
+
+        Example usage::
+
+            @manager.middleware
+            def application(environ, start_response):
+                ...
+
+        The difference to `make_middleware` is that the function passed
+        will have all the arguments copied from the inner application
+        (name, docstring, module).
+        """
+        return update_wrapper(self.make_middleware(func), func)
+
+    def __repr__(self):
+        return "<%s storages: %d>" % (self.__class__.__name__, len(self.locals))
+
+
+@implements_bool
+class LocalProxy(object):
+    """Acts as a proxy for a werkzeug local.  Forwards all operations to
+    a proxied object.  The only operations not supported for forwarding
+    are right handed operands and any kind of assignment.
+
+    Example usage::
+
+        from werkzeug.local import Local
+        l = Local()
+
+        # these are proxies
+        request = l('request')
+        user = l('user')
+
+
+        from werkzeug.local import LocalStack
+        _response_local = LocalStack()
+
+        # this is a proxy
+        response = _response_local()
+
+    Whenever something is bound to l.user / l.request the proxy objects
+    will forward all operations.  If no object is bound a :exc:`RuntimeError`
+    will be raised.
+
+    To create proxies to :class:`Local` or :class:`LocalStack` objects,
+    call the object as shown above.  If you want to have a proxy to an
+    object looked up by a function, you can (as of Werkzeug 0.6.1) pass
+    a function to the :class:`LocalProxy` constructor::
+
+        session = LocalProxy(lambda: get_current_request().session)
+
+    .. versionchanged:: 0.6.1
+       The class can be instantiated with a callable as well now.
+    """
+
+    __slots__ = ("__local", "__dict__", "__name__", "__wrapped__")
+
+    def __init__(self, local, name=None):
+        object.__setattr__(self, "_LocalProxy__local", local)
+        object.__setattr__(self, "__name__", name)
+        if callable(local) and not hasattr(local, "__release_local__"):
+            # "local" is a callable that is not an instance of Local or
+            # LocalManager: mark it as a wrapped function.
+            object.__setattr__(self, "__wrapped__", local)
+
+    def _get_current_object(self):
+        """Return the current object.  This is useful if you want the real
+        object behind the proxy at a time for performance reasons or because
+        you want to pass the object into a different context.
+        """
+        if not hasattr(self.__local, "__release_local__"):
+            return self.__local()
+        try:
+            return getattr(self.__local, self.__name__)
+        except AttributeError:
+            raise RuntimeError("no object bound to %s" % self.__name__)
+
+    @property
+    def __dict__(self):
+        try:
+            return self._get_current_object().__dict__
+        except RuntimeError:
+            raise AttributeError("__dict__")
+
+    def __repr__(self):
+        try:
+            obj = self._get_current_object()
+        except RuntimeError:
+            return "<%s unbound>" % self.__class__.__name__
+        return repr(obj)
+
+    def __bool__(self):
+        try:
+            return bool(self._get_current_object())
+        except RuntimeError:
+            return False
+
+    def __unicode__(self):
+        try:
+            return unicode(self._get_current_object())  # noqa
+        except RuntimeError:
+            return repr(self)
+
+    def __dir__(self):
+        try:
+            return dir(self._get_current_object())
+        except RuntimeError:
+            return []
+
+    def __getattr__(self, name):
+        if name == "__members__":
+            return dir(self._get_current_object())
+        return getattr(self._get_current_object(), name)
+
+    def __setitem__(self, key, value):
+        self._get_current_object()[key] = value
+
+    def __delitem__(self, key):
+        del self._get_current_object()[key]
+
+    if PY2:
+        __getslice__ = lambda x, i, j: x._get_current_object()[i:j]
+
+        def __setslice__(self, i, j, seq):
+            self._get_current_object()[i:j] = seq
+
+        def __delslice__(self, i, j):
+            del self._get_current_object()[i:j]
+
+    __setattr__ = lambda x, n, v: setattr(x._get_current_object(), n, v)
+    __delattr__ = lambda x, n: delattr(x._get_current_object(), n)
+    __str__ = lambda x: str(x._get_current_object())
+    __lt__ = lambda x, o: x._get_current_object() < o
+    __le__ = lambda x, o: x._get_current_object() <= o
+    __eq__ = lambda x, o: x._get_current_object() == o
+    __ne__ = lambda x, o: x._get_current_object() != o
+    __gt__ = lambda x, o: x._get_current_object() > o
+    __ge__ = lambda x, o: x._get_current_object() >= o
+    __cmp__ = lambda x, o: cmp(x._get_current_object(), o)  # noqa
+    __hash__ = lambda x: hash(x._get_current_object())
+    __call__ = lambda x, *a, **kw: x._get_current_object()(*a, **kw)
+    __len__ = lambda x: len(x._get_current_object())
+    __getitem__ = lambda x, i: x._get_current_object()[i]
+    __iter__ = lambda x: iter(x._get_current_object())
+    __contains__ = lambda x, i: i in x._get_current_object()
+    __add__ = lambda x, o: x._get_current_object() + o
+    __sub__ = lambda x, o: x._get_current_object() - o
+    __mul__ = lambda x, o: x._get_current_object() * o
+    __floordiv__ = lambda x, o: x._get_current_object() // o
+    __mod__ = lambda x, o: x._get_current_object() % o
+    __divmod__ = lambda x, o: x._get_current_object().__divmod__(o)
+    __pow__ = lambda x, o: x._get_current_object() ** o
+    __lshift__ = lambda x, o: x._get_current_object() << o
+    __rshift__ = lambda x, o: x._get_current_object() >> o
+    __and__ = lambda x, o: x._get_current_object() & o
+    __xor__ = lambda x, o: x._get_current_object() ^ o
+    __or__ = lambda x, o: x._get_current_object() | o
+    __div__ = lambda x, o: x._get_current_object().__div__(o)
+    __truediv__ = lambda x, o: x._get_current_object().__truediv__(o)
+    __neg__ = lambda x: -(x._get_current_object())
+    __pos__ = lambda x: +(x._get_current_object())
+    __abs__ = lambda x: abs(x._get_current_object())
+    __invert__ = lambda x: ~(x._get_current_object())
+    __complex__ = lambda x: complex(x._get_current_object())
+    __int__ = lambda x: int(x._get_current_object())
+    __long__ = lambda x: long(x._get_current_object())  # noqa
+    __float__ = lambda x: float(x._get_current_object())
+    __oct__ = lambda x: oct(x._get_current_object())
+    __hex__ = lambda x: hex(x._get_current_object())
+    __index__ = lambda x: x._get_current_object().__index__()
+    __coerce__ = lambda x, o: x._get_current_object().__coerce__(x, o)
+    __enter__ = lambda x: x._get_current_object().__enter__()
+    __exit__ = lambda x, *a, **kw: x._get_current_object().__exit__(*a, **kw)
+    __radd__ = lambda x, o: o + x._get_current_object()
+    __rsub__ = lambda x, o: o - x._get_current_object()
+    __rmul__ = lambda x, o: o * x._get_current_object()
+    __rdiv__ = lambda x, o: o / x._get_current_object()
+    if PY2:
+        __rtruediv__ = lambda x, o: x._get_current_object().__rtruediv__(o)
+    else:
+        __rtruediv__ = __rdiv__
+    __rfloordiv__ = lambda x, o: o // x._get_current_object()
+    __rmod__ = lambda x, o: o % x._get_current_object()
+    __rdivmod__ = lambda x, o: x._get_current_object().__rdivmod__(o)
+    __copy__ = lambda x: copy.copy(x._get_current_object())
+    __deepcopy__ = lambda x, memo: copy.deepcopy(x._get_current_object(), memo)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/middleware/__init__.py b/venv/lib/python3.7/site-packages/werkzeug/middleware/__init__.py
new file mode 100644
index 0000000..5e049f5
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/middleware/__init__.py
@@ -0,0 +1,25 @@
+"""
+Middleware
+==========
+
+A WSGI middleware is a WSGI application that wraps another application
+in order to observe or change its behavior. Werkzeug provides some
+middleware for common use cases.
+
+.. toctree::
+    :maxdepth: 1
+
+    proxy_fix
+    shared_data
+    dispatcher
+    http_proxy
+    lint
+    profiler
+
+The :doc:`interactive debugger ` is also a middleware that can
+be applied manually, although it is typically used automatically with
+the :doc:`development server `.
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
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diff --git a/venv/lib/python3.7/site-packages/werkzeug/middleware/dispatcher.py b/venv/lib/python3.7/site-packages/werkzeug/middleware/dispatcher.py
new file mode 100644
index 0000000..2eb173e
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/middleware/dispatcher.py
@@ -0,0 +1,66 @@
+"""
+Application Dispatcher
+======================
+
+This middleware creates a single WSGI application that dispatches to
+multiple other WSGI applications mounted at different URL paths.
+
+A common example is writing a Single Page Application, where you have a
+backend API and a frontend written in JavaScript that does the routing
+in the browser rather than requesting different pages from the server.
+The frontend is a single HTML and JS file that should be served for any
+path besides "/api".
+
+This example dispatches to an API app under "/api", an admin app
+under "/admin", and an app that serves frontend files for all other
+requests::
+
+    app = DispatcherMiddleware(serve_frontend, {
+        '/api': api_app,
+        '/admin': admin_app,
+    })
+
+In production, you might instead handle this at the HTTP server level,
+serving files or proxying to application servers based on location. The
+API and admin apps would each be deployed with a separate WSGI server,
+and the static files would be served directly by the HTTP server.
+
+.. autoclass:: DispatcherMiddleware
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
+
+
+class DispatcherMiddleware(object):
+    """Combine multiple applications as a single WSGI application.
+    Requests are dispatched to an application based on the path it is
+    mounted under.
+
+    :param app: The WSGI application to dispatch to if the request
+        doesn't match a mounted path.
+    :param mounts: Maps path prefixes to applications for dispatching.
+    """
+
+    def __init__(self, app, mounts=None):
+        self.app = app
+        self.mounts = mounts or {}
+
+    def __call__(self, environ, start_response):
+        script = environ.get("PATH_INFO", "")
+        path_info = ""
+
+        while "/" in script:
+            if script in self.mounts:
+                app = self.mounts[script]
+                break
+
+            script, last_item = script.rsplit("/", 1)
+            path_info = "/%s%s" % (last_item, path_info)
+        else:
+            app = self.mounts.get(script, self.app)
+
+        original_script_name = environ.get("SCRIPT_NAME", "")
+        environ["SCRIPT_NAME"] = original_script_name + script
+        environ["PATH_INFO"] = path_info
+        return app(environ, start_response)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/middleware/http_proxy.py b/venv/lib/python3.7/site-packages/werkzeug/middleware/http_proxy.py
new file mode 100644
index 0000000..bfdc071
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/middleware/http_proxy.py
@@ -0,0 +1,219 @@
+"""
+Basic HTTP Proxy
+================
+
+.. autoclass:: ProxyMiddleware
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
+import socket
+
+from ..datastructures import EnvironHeaders
+from ..http import is_hop_by_hop_header
+from ..urls import url_parse
+from ..urls import url_quote
+from ..wsgi import get_input_stream
+
+try:
+    from http import client
+except ImportError:
+    import httplib as client
+
+
+class ProxyMiddleware(object):
+    """Proxy requests under a path to an external server, routing other
+    requests to the app.
+
+    This middleware can only proxy HTTP requests, as that is the only
+    protocol handled by the WSGI server. Other protocols, such as
+    websocket requests, cannot be proxied at this layer. This should
+    only be used for development, in production a real proxying server
+    should be used.
+
+    The middleware takes a dict that maps a path prefix to a dict
+    describing the host to be proxied to::
+
+        app = ProxyMiddleware(app, {
+            "/static/": {
+                "target": "http://127.0.0.1:5001/",
+            }
+        })
+
+    Each host has the following options:
+
+    ``target``:
+        The target URL to dispatch to. This is required.
+    ``remove_prefix``:
+        Whether to remove the prefix from the URL before dispatching it
+        to the target. The default is ``False``.
+    ``host``:
+        ``""`` (default):
+            The host header is automatically rewritten to the URL of the
+            target.
+        ``None``:
+            The host header is unmodified from the client request.
+        Any other value:
+            The host header is overwritten with the value.
+    ``headers``:
+        A dictionary of headers to be sent with the request to the
+        target. The default is ``{}``.
+    ``ssl_context``:
+        A :class:`ssl.SSLContext` defining how to verify requests if the
+        target is HTTPS. The default is ``None``.
+
+    In the example above, everything under ``"/static/"`` is proxied to
+    the server on port 5001. The host header is rewritten to the target,
+    and the ``"/static/"`` prefix is removed from the URLs.
+
+    :param app: The WSGI application to wrap.
+    :param targets: Proxy target configurations. See description above.
+    :param chunk_size: Size of chunks to read from input stream and
+        write to target.
+    :param timeout: Seconds before an operation to a target fails.
+
+    .. versionadded:: 0.14
+    """
+
+    def __init__(self, app, targets, chunk_size=2 << 13, timeout=10):
+        def _set_defaults(opts):
+            opts.setdefault("remove_prefix", False)
+            opts.setdefault("host", "")
+            opts.setdefault("headers", {})
+            opts.setdefault("ssl_context", None)
+            return opts
+
+        self.app = app
+        self.targets = dict(
+            ("/%s/" % k.strip("/"), _set_defaults(v)) for k, v in targets.items()
+        )
+        self.chunk_size = chunk_size
+        self.timeout = timeout
+
+    def proxy_to(self, opts, path, prefix):
+        target = url_parse(opts["target"])
+
+        def application(environ, start_response):
+            headers = list(EnvironHeaders(environ).items())
+            headers[:] = [
+                (k, v)
+                for k, v in headers
+                if not is_hop_by_hop_header(k)
+                and k.lower() not in ("content-length", "host")
+            ]
+            headers.append(("Connection", "close"))
+
+            if opts["host"] == "":
+                headers.append(("Host", target.ascii_host))
+            elif opts["host"] is None:
+                headers.append(("Host", environ["HTTP_HOST"]))
+            else:
+                headers.append(("Host", opts["host"]))
+
+            headers.extend(opts["headers"].items())
+            remote_path = path
+
+            if opts["remove_prefix"]:
+                remote_path = "%s/%s" % (
+                    target.path.rstrip("/"),
+                    remote_path[len(prefix) :].lstrip("/"),
+                )
+
+            content_length = environ.get("CONTENT_LENGTH")
+            chunked = False
+
+            if content_length not in ("", None):
+                headers.append(("Content-Length", content_length))
+            elif content_length is not None:
+                headers.append(("Transfer-Encoding", "chunked"))
+                chunked = True
+
+            try:
+                if target.scheme == "http":
+                    con = client.HTTPConnection(
+                        target.ascii_host, target.port or 80, timeout=self.timeout
+                    )
+                elif target.scheme == "https":
+                    con = client.HTTPSConnection(
+                        target.ascii_host,
+                        target.port or 443,
+                        timeout=self.timeout,
+                        context=opts["ssl_context"],
+                    )
+                else:
+                    raise RuntimeError(
+                        "Target scheme must be 'http' or 'https', got '{}'.".format(
+                            target.scheme
+                        )
+                    )
+
+                con.connect()
+                remote_url = url_quote(remote_path)
+                querystring = environ["QUERY_STRING"]
+
+                if querystring:
+                    remote_url = remote_url + "?" + querystring
+
+                con.putrequest(environ["REQUEST_METHOD"], remote_url, skip_host=True)
+
+                for k, v in headers:
+                    if k.lower() == "connection":
+                        v = "close"
+
+                    con.putheader(k, v)
+
+                con.endheaders()
+                stream = get_input_stream(environ)
+
+                while 1:
+                    data = stream.read(self.chunk_size)
+
+                    if not data:
+                        break
+
+                    if chunked:
+                        con.send(b"%x\r\n%s\r\n" % (len(data), data))
+                    else:
+                        con.send(data)
+
+                resp = con.getresponse()
+            except socket.error:
+                from ..exceptions import BadGateway
+
+                return BadGateway()(environ, start_response)
+
+            start_response(
+                "%d %s" % (resp.status, resp.reason),
+                [
+                    (k.title(), v)
+                    for k, v in resp.getheaders()
+                    if not is_hop_by_hop_header(k)
+                ],
+            )
+
+            def read():
+                while 1:
+                    try:
+                        data = resp.read(self.chunk_size)
+                    except socket.error:
+                        break
+
+                    if not data:
+                        break
+
+                    yield data
+
+            return read()
+
+        return application
+
+    def __call__(self, environ, start_response):
+        path = environ["PATH_INFO"]
+        app = self.app
+
+        for prefix, opts in self.targets.items():
+            if path.startswith(prefix):
+                app = self.proxy_to(opts, path, prefix)
+                break
+
+        return app(environ, start_response)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/middleware/lint.py b/venv/lib/python3.7/site-packages/werkzeug/middleware/lint.py
new file mode 100644
index 0000000..98f9581
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/middleware/lint.py
@@ -0,0 +1,408 @@
+"""
+WSGI Protocol Linter
+====================
+
+This module provides a middleware that performs sanity checks on the
+behavior of the WSGI server and application. It checks that the
+:pep:`3333` WSGI spec is properly implemented. It also warns on some
+common HTTP errors such as non-empty responses for 304 status codes.
+
+.. autoclass:: LintMiddleware
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
+from warnings import warn
+
+from .._compat import implements_iterator
+from .._compat import PY2
+from .._compat import string_types
+from ..datastructures import Headers
+from ..http import is_entity_header
+from ..wsgi import FileWrapper
+
+try:
+    from urllib.parse import urlparse
+except ImportError:
+    from urlparse import urlparse
+
+
+class WSGIWarning(Warning):
+    """Warning class for WSGI warnings."""
+
+
+class HTTPWarning(Warning):
+    """Warning class for HTTP warnings."""
+
+
+def check_string(context, obj, stacklevel=3):
+    if type(obj) is not str:
+        warn(
+            "'%s' requires strings, got '%s'" % (context, type(obj).__name__),
+            WSGIWarning,
+        )
+
+
+class InputStream(object):
+    def __init__(self, stream):
+        self._stream = stream
+
+    def read(self, *args):
+        if len(args) == 0:
+            warn(
+                "WSGI does not guarantee an EOF marker on the input stream, thus making"
+                " calls to 'wsgi.input.read()' unsafe. Conforming servers may never"
+                " return from this call.",
+                WSGIWarning,
+                stacklevel=2,
+            )
+        elif len(args) != 1:
+            warn(
+                "Too many parameters passed to 'wsgi.input.read()'.",
+                WSGIWarning,
+                stacklevel=2,
+            )
+        return self._stream.read(*args)
+
+    def readline(self, *args):
+        if len(args) == 0:
+            warn(
+                "Calls to 'wsgi.input.readline()' without arguments are unsafe. Use"
+                " 'wsgi.input.read()' instead.",
+                WSGIWarning,
+                stacklevel=2,
+            )
+        elif len(args) == 1:
+            warn(
+                "'wsgi.input.readline()' was called with a size hint. WSGI does not"
+                " support this, although it's available on all major servers.",
+                WSGIWarning,
+                stacklevel=2,
+            )
+        else:
+            raise TypeError("Too many arguments passed to 'wsgi.input.readline()'.")
+        return self._stream.readline(*args)
+
+    def __iter__(self):
+        try:
+            return iter(self._stream)
+        except TypeError:
+            warn("'wsgi.input' is not iterable.", WSGIWarning, stacklevel=2)
+            return iter(())
+
+    def close(self):
+        warn("The application closed the input stream!", WSGIWarning, stacklevel=2)
+        self._stream.close()
+
+
+class ErrorStream(object):
+    def __init__(self, stream):
+        self._stream = stream
+
+    def write(self, s):
+        check_string("wsgi.error.write()", s)
+        self._stream.write(s)
+
+    def flush(self):
+        self._stream.flush()
+
+    def writelines(self, seq):
+        for line in seq:
+            self.write(line)
+
+    def close(self):
+        warn("The application closed the error stream!", WSGIWarning, stacklevel=2)
+        self._stream.close()
+
+
+class GuardedWrite(object):
+    def __init__(self, write, chunks):
+        self._write = write
+        self._chunks = chunks
+
+    def __call__(self, s):
+        check_string("write()", s)
+        self._write.write(s)
+        self._chunks.append(len(s))
+
+
+@implements_iterator
+class GuardedIterator(object):
+    def __init__(self, iterator, headers_set, chunks):
+        self._iterator = iterator
+        if PY2:
+            self._next = iter(iterator).next
+        else:
+            self._next = iter(iterator).__next__
+        self.closed = False
+        self.headers_set = headers_set
+        self.chunks = chunks
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.closed:
+            warn("Iterated over closed 'app_iter'.", WSGIWarning, stacklevel=2)
+
+        rv = self._next()
+
+        if not self.headers_set:
+            warn(
+                "The application returned before it started the response.",
+                WSGIWarning,
+                stacklevel=2,
+            )
+
+        check_string("application iterator items", rv)
+        self.chunks.append(len(rv))
+        return rv
+
+    def close(self):
+        self.closed = True
+
+        if hasattr(self._iterator, "close"):
+            self._iterator.close()
+
+        if self.headers_set:
+            status_code, headers = self.headers_set
+            bytes_sent = sum(self.chunks)
+            content_length = headers.get("content-length", type=int)
+
+            if status_code == 304:
+                for key, _value in headers:
+                    key = key.lower()
+                    if key not in ("expires", "content-location") and is_entity_header(
+                        key
+                    ):
+                        warn(
+                            "Entity header %r found in 304 response." % key, HTTPWarning
+                        )
+                if bytes_sent:
+                    warn("304 responses must not have a body.", HTTPWarning)
+            elif 100 <= status_code < 200 or status_code == 204:
+                if content_length != 0:
+                    warn(
+                        "%r responses must have an empty content length." % status_code,
+                        HTTPWarning,
+                    )
+                if bytes_sent:
+                    warn(
+                        "%r responses must not have a body." % status_code, HTTPWarning
+                    )
+            elif content_length is not None and content_length != bytes_sent:
+                warn(
+                    "Content-Length and the number of bytes sent to the client do not"
+                    " match.",
+                    WSGIWarning,
+                )
+
+    def __del__(self):
+        if not self.closed:
+            try:
+                warn(
+                    "Iterator was garbage collected before it was closed.", WSGIWarning
+                )
+            except Exception:
+                pass
+
+
+class LintMiddleware(object):
+    """Warns about common errors in the WSGI and HTTP behavior of the
+    server and wrapped application. Some of the issues it check are:
+
+    -   invalid status codes
+    -   non-bytestrings sent to the WSGI server
+    -   strings returned from the WSGI application
+    -   non-empty conditional responses
+    -   unquoted etags
+    -   relative URLs in the Location header
+    -   unsafe calls to wsgi.input
+    -   unclosed iterators
+
+    Error information is emitted using the :mod:`warnings` module.
+
+    :param app: The WSGI application to wrap.
+
+    .. code-block:: python
+
+        from werkzeug.middleware.lint import LintMiddleware
+        app = LintMiddleware(app)
+    """
+
+    def __init__(self, app):
+        self.app = app
+
+    def check_environ(self, environ):
+        if type(environ) is not dict:
+            warn(
+                "WSGI environment is not a standard Python dict.",
+                WSGIWarning,
+                stacklevel=4,
+            )
+        for key in (
+            "REQUEST_METHOD",
+            "SERVER_NAME",
+            "SERVER_PORT",
+            "wsgi.version",
+            "wsgi.input",
+            "wsgi.errors",
+            "wsgi.multithread",
+            "wsgi.multiprocess",
+            "wsgi.run_once",
+        ):
+            if key not in environ:
+                warn(
+                    "Required environment key %r not found" % key,
+                    WSGIWarning,
+                    stacklevel=3,
+                )
+        if environ["wsgi.version"] != (1, 0):
+            warn("Environ is not a WSGI 1.0 environ.", WSGIWarning, stacklevel=3)
+
+        script_name = environ.get("SCRIPT_NAME", "")
+        path_info = environ.get("PATH_INFO", "")
+
+        if script_name and script_name[0] != "/":
+            warn(
+                "'SCRIPT_NAME' does not start with a slash: %r" % script_name,
+                WSGIWarning,
+                stacklevel=3,
+            )
+
+        if path_info and path_info[0] != "/":
+            warn(
+                "'PATH_INFO' does not start with a slash: %r" % path_info,
+                WSGIWarning,
+                stacklevel=3,
+            )
+
+    def check_start_response(self, status, headers, exc_info):
+        check_string("status", status)
+        status_code = status.split(None, 1)[0]
+
+        if len(status_code) != 3 or not status_code.isdigit():
+            warn(WSGIWarning("Status code must be three digits"), stacklevel=3)
+
+        if len(status) < 4 or status[3] != " ":
+            warn(
+                WSGIWarning(
+                    "Invalid value for status %r.  Valid "
+                    "status strings are three digits, a space "
+                    "and a status explanation"
+                ),
+                stacklevel=3,
+            )
+
+        status_code = int(status_code)
+
+        if status_code < 100:
+            warn(WSGIWarning("status code < 100 detected"), stacklevel=3)
+
+        if type(headers) is not list:
+            warn(WSGIWarning("header list is not a list"), stacklevel=3)
+
+        for item in headers:
+            if type(item) is not tuple or len(item) != 2:
+                warn(WSGIWarning("Headers must tuple 2-item tuples"), stacklevel=3)
+            name, value = item
+            if type(name) is not str or type(value) is not str:
+                warn(WSGIWarning("header items must be strings"), stacklevel=3)
+            if name.lower() == "status":
+                warn(
+                    WSGIWarning(
+                        "The status header is not supported due to "
+                        "conflicts with the CGI spec."
+                    ),
+                    stacklevel=3,
+                )
+
+        if exc_info is not None and not isinstance(exc_info, tuple):
+            warn(WSGIWarning("invalid value for exc_info"), stacklevel=3)
+
+        headers = Headers(headers)
+        self.check_headers(headers)
+
+        return status_code, headers
+
+    def check_headers(self, headers):
+        etag = headers.get("etag")
+
+        if etag is not None:
+            if etag.startswith(("W/", "w/")):
+                if etag.startswith("w/"):
+                    warn(
+                        HTTPWarning("weak etag indicator should be upcase."),
+                        stacklevel=4,
+                    )
+
+                etag = etag[2:]
+
+            if not (etag[:1] == etag[-1:] == '"'):
+                warn(HTTPWarning("unquoted etag emitted."), stacklevel=4)
+
+        location = headers.get("location")
+
+        if location is not None:
+            if not urlparse(location).netloc:
+                warn(
+                    HTTPWarning("absolute URLs required for location header"),
+                    stacklevel=4,
+                )
+
+    def check_iterator(self, app_iter):
+        if isinstance(app_iter, string_types):
+            warn(
+                "The application returned astring. The response will send one character"
+                " at a time to the client, which will kill performance. Return a list"
+                " or iterable instead.",
+                WSGIWarning,
+                stacklevel=3,
+            )
+
+    def __call__(self, *args, **kwargs):
+        if len(args) != 2:
+            warn("A WSGI app takes two arguments.", WSGIWarning, stacklevel=2)
+
+        if kwargs:
+            warn(
+                "A WSGI app does not take keyword arguments.", WSGIWarning, stacklevel=2
+            )
+
+        environ, start_response = args
+
+        self.check_environ(environ)
+        environ["wsgi.input"] = InputStream(environ["wsgi.input"])
+        environ["wsgi.errors"] = ErrorStream(environ["wsgi.errors"])
+
+        # Hook our own file wrapper in so that applications will always
+        # iterate to the end and we can check the content length.
+        environ["wsgi.file_wrapper"] = FileWrapper
+
+        headers_set = []
+        chunks = []
+
+        def checking_start_response(*args, **kwargs):
+            if len(args) not in (2, 3):
+                warn(
+                    "Invalid number of arguments: %s, expected 2 or 3." % len(args),
+                    WSGIWarning,
+                    stacklevel=2,
+                )
+
+            if kwargs:
+                warn("'start_response' does not take keyword arguments.", WSGIWarning)
+
+            status, headers = args[:2]
+
+            if len(args) == 3:
+                exc_info = args[2]
+            else:
+                exc_info = None
+
+            headers_set[:] = self.check_start_response(status, headers, exc_info)
+            return GuardedWrite(start_response(status, headers, exc_info), chunks)
+
+        app_iter = self.app(environ, checking_start_response)
+        self.check_iterator(app_iter)
+        return GuardedIterator(app_iter, headers_set, chunks)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/middleware/profiler.py b/venv/lib/python3.7/site-packages/werkzeug/middleware/profiler.py
new file mode 100644
index 0000000..32a14d9
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/middleware/profiler.py
@@ -0,0 +1,132 @@
+"""
+Application Profiler
+====================
+
+This module provides a middleware that profiles each request with the
+:mod:`cProfile` module. This can help identify bottlenecks in your code
+that may be slowing down your application.
+
+.. autoclass:: ProfilerMiddleware
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
+from __future__ import print_function
+
+import os.path
+import sys
+import time
+from pstats import Stats
+
+try:
+    from cProfile import Profile
+except ImportError:
+    from profile import Profile
+
+
+class ProfilerMiddleware(object):
+    """Wrap a WSGI application and profile the execution of each
+    request. Responses are buffered so that timings are more exact.
+
+    If ``stream`` is given, :class:`pstats.Stats` are written to it
+    after each request. If ``profile_dir`` is given, :mod:`cProfile`
+    data files are saved to that directory, one file per request.
+
+    The filename can be customized by passing ``filename_format``. If
+    it is a string, it will be formatted using :meth:`str.format` with
+    the following fields available:
+
+    -   ``{method}`` - The request method; GET, POST, etc.
+    -   ``{path}`` - The request path or 'root' should one not exist.
+    -   ``{elapsed}`` - The elapsed time of the request.
+    -   ``{time}`` - The time of the request.
+
+    If it is a callable, it will be called with the WSGI ``environ``
+    dict and should return a filename.
+
+    :param app: The WSGI application to wrap.
+    :param stream: Write stats to this stream. Disable with ``None``.
+    :param sort_by: A tuple of columns to sort stats by. See
+        :meth:`pstats.Stats.sort_stats`.
+    :param restrictions: A tuple of restrictions to filter stats by. See
+        :meth:`pstats.Stats.print_stats`.
+    :param profile_dir: Save profile data files to this directory.
+    :param filename_format: Format string for profile data file names,
+        or a callable returning a name. See explanation above.
+
+    .. code-block:: python
+
+        from werkzeug.middleware.profiler import ProfilerMiddleware
+        app = ProfilerMiddleware(app)
+
+    .. versionchanged:: 0.15
+        Stats are written even if ``profile_dir`` is given, and can be
+        disable by passing ``stream=None``.
+
+    .. versionadded:: 0.15
+        Added ``filename_format``.
+
+    .. versionadded:: 0.9
+        Added ``restrictions`` and ``profile_dir``.
+    """
+
+    def __init__(
+        self,
+        app,
+        stream=sys.stdout,
+        sort_by=("time", "calls"),
+        restrictions=(),
+        profile_dir=None,
+        filename_format="{method}.{path}.{elapsed:.0f}ms.{time:.0f}.prof",
+    ):
+        self._app = app
+        self._stream = stream
+        self._sort_by = sort_by
+        self._restrictions = restrictions
+        self._profile_dir = profile_dir
+        self._filename_format = filename_format
+
+    def __call__(self, environ, start_response):
+        response_body = []
+
+        def catching_start_response(status, headers, exc_info=None):
+            start_response(status, headers, exc_info)
+            return response_body.append
+
+        def runapp():
+            app_iter = self._app(environ, catching_start_response)
+            response_body.extend(app_iter)
+
+            if hasattr(app_iter, "close"):
+                app_iter.close()
+
+        profile = Profile()
+        start = time.time()
+        profile.runcall(runapp)
+        body = b"".join(response_body)
+        elapsed = time.time() - start
+
+        if self._profile_dir is not None:
+            if callable(self._filename_format):
+                filename = self._filename_format(environ)
+            else:
+                filename = self._filename_format.format(
+                    method=environ["REQUEST_METHOD"],
+                    path=(
+                        environ.get("PATH_INFO").strip("/").replace("/", ".") or "root"
+                    ),
+                    elapsed=elapsed * 1000.0,
+                    time=time.time(),
+                )
+            filename = os.path.join(self._profile_dir, filename)
+            profile.dump_stats(filename)
+
+        if self._stream is not None:
+            stats = Stats(profile, stream=self._stream)
+            stats.sort_stats(*self._sort_by)
+            print("-" * 80, file=self._stream)
+            print("PATH: {!r}".format(environ.get("PATH_INFO", "")), file=self._stream)
+            stats.print_stats(*self._restrictions)
+            print("-" * 80 + "\n", file=self._stream)
+
+        return [body]
diff --git a/venv/lib/python3.7/site-packages/werkzeug/middleware/proxy_fix.py b/venv/lib/python3.7/site-packages/werkzeug/middleware/proxy_fix.py
new file mode 100644
index 0000000..dc1dacc
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/middleware/proxy_fix.py
@@ -0,0 +1,228 @@
+"""
+X-Forwarded-For Proxy Fix
+=========================
+
+This module provides a middleware that adjusts the WSGI environ based on
+``X-Forwarded-`` headers that proxies in front of an application may
+set.
+
+When an application is running behind a proxy server, WSGI may see the
+request as coming from that server rather than the real client. Proxies
+set various headers to track where the request actually came from.
+
+This middleware should only be applied if the application is actually
+behind such a proxy, and should be configured with the number of proxies
+that are chained in front of it. Not all proxies set all the headers.
+Since incoming headers can be faked, you must set how many proxies are
+setting each header so the middleware knows what to trust.
+
+.. autoclass:: ProxyFix
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
+import warnings
+
+
+class ProxyFix(object):
+    """Adjust the WSGI environ based on ``X-Forwarded-`` that proxies in
+    front of the application may set.
+
+    -   ``X-Forwarded-For`` sets ``REMOTE_ADDR``.
+    -   ``X-Forwarded-Proto`` sets ``wsgi.url_scheme``.
+    -   ``X-Forwarded-Host`` sets ``HTTP_HOST``, ``SERVER_NAME``, and
+        ``SERVER_PORT``.
+    -   ``X-Forwarded-Port`` sets ``HTTP_HOST`` and ``SERVER_PORT``.
+    -   ``X-Forwarded-Prefix`` sets ``SCRIPT_NAME``.
+
+    You must tell the middleware how many proxies set each header so it
+    knows what values to trust. It is a security issue to trust values
+    that came from the client rather than a proxy.
+
+    The original values of the headers are stored in the WSGI
+    environ as ``werkzeug.proxy_fix.orig``, a dict.
+
+    :param app: The WSGI application to wrap.
+    :param x_for: Number of values to trust for ``X-Forwarded-For``.
+    :param x_proto: Number of values to trust for ``X-Forwarded-Proto``.
+    :param x_host: Number of values to trust for ``X-Forwarded-Host``.
+    :param x_port: Number of values to trust for ``X-Forwarded-Port``.
+    :param x_prefix: Number of values to trust for
+        ``X-Forwarded-Prefix``.
+    :param num_proxies: Deprecated, use ``x_for`` instead.
+
+    .. code-block:: python
+
+        from werkzeug.middleware.proxy_fix import ProxyFix
+        # App is behind one proxy that sets the -For and -Host headers.
+        app = ProxyFix(app, x_for=1, x_host=1)
+
+    .. versionchanged:: 0.15
+        All headers support multiple values. The ``num_proxies``
+        argument is deprecated. Each header is configured with a
+        separate number of trusted proxies.
+
+    .. versionchanged:: 0.15
+        Original WSGI environ values are stored in the
+        ``werkzeug.proxy_fix.orig`` dict. ``orig_remote_addr``,
+        ``orig_wsgi_url_scheme``, and ``orig_http_host`` are deprecated
+        and will be removed in 1.0.
+
+    .. versionchanged:: 0.15
+        Support ``X-Forwarded-Port`` and ``X-Forwarded-Prefix``.
+
+    .. versionchanged:: 0.15
+        ``X-Fowarded-Host`` and ``X-Forwarded-Port`` modify
+        ``SERVER_NAME`` and ``SERVER_PORT``.
+    """
+
+    def __init__(
+        self, app, num_proxies=None, x_for=1, x_proto=0, x_host=0, x_port=0, x_prefix=0
+    ):
+        self.app = app
+        self.x_for = x_for
+        self.x_proto = x_proto
+        self.x_host = x_host
+        self.x_port = x_port
+        self.x_prefix = x_prefix
+        self.num_proxies = num_proxies
+
+    @property
+    def num_proxies(self):
+        """The number of proxies setting ``X-Forwarded-For`` in front
+        of the application.
+
+        .. deprecated:: 0.15
+            A separate number of trusted proxies is configured for each
+            header. ``num_proxies`` maps to ``x_for``. This method will
+            be removed in 1.0.
+
+        :internal:
+        """
+        warnings.warn(
+            "'num_proxies' is deprecated as of version 0.15 and will be"
+            " removed in version 1.0. Use 'x_for' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return self.x_for
+
+    @num_proxies.setter
+    def num_proxies(self, value):
+        if value is not None:
+            warnings.warn(
+                "'num_proxies' is deprecated as of version 0.15 and"
+                " will be removed in version 1.0. Use 'x_for' instead.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+            self.x_for = value
+
+    def get_remote_addr(self, forwarded_for):
+        """Get the real ``remote_addr`` by looking backwards ``x_for``
+        number of values in the ``X-Forwarded-For`` header.
+
+        :param forwarded_for: List of values parsed from the
+            ``X-Forwarded-For`` header.
+        :return: The real ``remote_addr``, or ``None`` if there were not
+            at least ``x_for`` values.
+
+        .. deprecated:: 0.15
+            This is handled internally for each header. This method will
+            be removed in 1.0.
+
+        .. versionchanged:: 0.9
+            Use ``num_proxies`` instead of always picking the first
+            value.
+
+        .. versionadded:: 0.8
+        """
+        warnings.warn(
+            "'get_remote_addr' is deprecated as of version 0.15 and"
+            " will be removed in version 1.0. It is now handled"
+            " internally for each header.",
+            DeprecationWarning,
+        )
+        return self._get_trusted_comma(self.x_for, ",".join(forwarded_for))
+
+    def _get_trusted_comma(self, trusted, value):
+        """Get the real value from a comma-separated header based on the
+        configured number of trusted proxies.
+
+        :param trusted: Number of values to trust in the header.
+        :param value: Header value to parse.
+        :return: The real value, or ``None`` if there are fewer values
+            than the number of trusted proxies.
+
+        .. versionadded:: 0.15
+        """
+        if not (trusted and value):
+            return
+        values = [x.strip() for x in value.split(",")]
+        if len(values) >= trusted:
+            return values[-trusted]
+
+    def __call__(self, environ, start_response):
+        """Modify the WSGI environ based on the various ``Forwarded``
+        headers before calling the wrapped application. Store the
+        original environ values in ``werkzeug.proxy_fix.orig_{key}``.
+        """
+        environ_get = environ.get
+        orig_remote_addr = environ_get("REMOTE_ADDR")
+        orig_wsgi_url_scheme = environ_get("wsgi.url_scheme")
+        orig_http_host = environ_get("HTTP_HOST")
+        environ.update(
+            {
+                "werkzeug.proxy_fix.orig": {
+                    "REMOTE_ADDR": orig_remote_addr,
+                    "wsgi.url_scheme": orig_wsgi_url_scheme,
+                    "HTTP_HOST": orig_http_host,
+                    "SERVER_NAME": environ_get("SERVER_NAME"),
+                    "SERVER_PORT": environ_get("SERVER_PORT"),
+                    "SCRIPT_NAME": environ_get("SCRIPT_NAME"),
+                },
+                # todo: remove deprecated keys
+                "werkzeug.proxy_fix.orig_remote_addr": orig_remote_addr,
+                "werkzeug.proxy_fix.orig_wsgi_url_scheme": orig_wsgi_url_scheme,
+                "werkzeug.proxy_fix.orig_http_host": orig_http_host,
+            }
+        )
+
+        x_for = self._get_trusted_comma(self.x_for, environ_get("HTTP_X_FORWARDED_FOR"))
+        if x_for:
+            environ["REMOTE_ADDR"] = x_for
+
+        x_proto = self._get_trusted_comma(
+            self.x_proto, environ_get("HTTP_X_FORWARDED_PROTO")
+        )
+        if x_proto:
+            environ["wsgi.url_scheme"] = x_proto
+
+        x_host = self._get_trusted_comma(
+            self.x_host, environ_get("HTTP_X_FORWARDED_HOST")
+        )
+        if x_host:
+            environ["HTTP_HOST"] = x_host
+            parts = x_host.split(":", 1)
+            environ["SERVER_NAME"] = parts[0]
+            if len(parts) == 2:
+                environ["SERVER_PORT"] = parts[1]
+
+        x_port = self._get_trusted_comma(
+            self.x_port, environ_get("HTTP_X_FORWARDED_PORT")
+        )
+        if x_port:
+            host = environ.get("HTTP_HOST")
+            if host:
+                parts = host.split(":", 1)
+                host = parts[0] if len(parts) == 2 else host
+                environ["HTTP_HOST"] = "%s:%s" % (host, x_port)
+            environ["SERVER_PORT"] = x_port
+
+        x_prefix = self._get_trusted_comma(
+            self.x_prefix, environ_get("HTTP_X_FORWARDED_PREFIX")
+        )
+        if x_prefix:
+            environ["SCRIPT_NAME"] = x_prefix
+
+        return self.app(environ, start_response)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/middleware/shared_data.py b/venv/lib/python3.7/site-packages/werkzeug/middleware/shared_data.py
new file mode 100644
index 0000000..a902281
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/middleware/shared_data.py
@@ -0,0 +1,260 @@
+"""
+Serve Shared Static Files
+=========================
+
+.. autoclass:: SharedDataMiddleware
+    :members: is_allowed
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
+import mimetypes
+import os
+import posixpath
+from datetime import datetime
+from io import BytesIO
+from time import mktime
+from time import time
+from zlib import adler32
+
+from .._compat import PY2
+from .._compat import string_types
+from ..filesystem import get_filesystem_encoding
+from ..http import http_date
+from ..http import is_resource_modified
+from ..wsgi import get_path_info
+from ..wsgi import wrap_file
+
+
+class SharedDataMiddleware(object):
+
+    """A WSGI middleware that provides static content for development
+    environments or simple server setups. Usage is quite simple::
+
+        import os
+        from werkzeug.wsgi import SharedDataMiddleware
+
+        app = SharedDataMiddleware(app, {
+            '/static': os.path.join(os.path.dirname(__file__), 'static')
+        })
+
+    The contents of the folder ``./shared`` will now be available on
+    ``http://example.com/shared/``.  This is pretty useful during development
+    because a standalone media server is not required.  One can also mount
+    files on the root folder and still continue to use the application because
+    the shared data middleware forwards all unhandled requests to the
+    application, even if the requests are below one of the shared folders.
+
+    If `pkg_resources` is available you can also tell the middleware to serve
+    files from package data::
+
+        app = SharedDataMiddleware(app, {
+            '/static': ('myapplication', 'static')
+        })
+
+    This will then serve the ``static`` folder in the `myapplication`
+    Python package.
+
+    The optional `disallow` parameter can be a list of :func:`~fnmatch.fnmatch`
+    rules for files that are not accessible from the web.  If `cache` is set to
+    `False` no caching headers are sent.
+
+    Currently the middleware does not support non ASCII filenames.  If the
+    encoding on the file system happens to be the encoding of the URI it may
+    work but this could also be by accident.  We strongly suggest using ASCII
+    only file names for static files.
+
+    The middleware will guess the mimetype using the Python `mimetype`
+    module.  If it's unable to figure out the charset it will fall back
+    to `fallback_mimetype`.
+
+    .. versionchanged:: 0.5
+       The cache timeout is configurable now.
+
+    .. versionadded:: 0.6
+       The `fallback_mimetype` parameter was added.
+
+    :param app: the application to wrap.  If you don't want to wrap an
+                application you can pass it :exc:`NotFound`.
+    :param exports: a list or dict of exported files and folders.
+    :param disallow: a list of :func:`~fnmatch.fnmatch` rules.
+    :param fallback_mimetype: the fallback mimetype for unknown files.
+    :param cache: enable or disable caching headers.
+    :param cache_timeout: the cache timeout in seconds for the headers.
+    """
+
+    def __init__(
+        self,
+        app,
+        exports,
+        disallow=None,
+        cache=True,
+        cache_timeout=60 * 60 * 12,
+        fallback_mimetype="text/plain",
+    ):
+        self.app = app
+        self.exports = []
+        self.cache = cache
+        self.cache_timeout = cache_timeout
+
+        if hasattr(exports, "items"):
+            exports = exports.items()
+
+        for key, value in exports:
+            if isinstance(value, tuple):
+                loader = self.get_package_loader(*value)
+            elif isinstance(value, string_types):
+                if os.path.isfile(value):
+                    loader = self.get_file_loader(value)
+                else:
+                    loader = self.get_directory_loader(value)
+            else:
+                raise TypeError("unknown def %r" % value)
+
+            self.exports.append((key, loader))
+
+        if disallow is not None:
+            from fnmatch import fnmatch
+
+            self.is_allowed = lambda x: not fnmatch(x, disallow)
+
+        self.fallback_mimetype = fallback_mimetype
+
+    def is_allowed(self, filename):
+        """Subclasses can override this method to disallow the access to
+        certain files.  However by providing `disallow` in the constructor
+        this method is overwritten.
+        """
+        return True
+
+    def _opener(self, filename):
+        return lambda: (
+            open(filename, "rb"),
+            datetime.utcfromtimestamp(os.path.getmtime(filename)),
+            int(os.path.getsize(filename)),
+        )
+
+    def get_file_loader(self, filename):
+        return lambda x: (os.path.basename(filename), self._opener(filename))
+
+    def get_package_loader(self, package, package_path):
+        from pkg_resources import DefaultProvider, ResourceManager, get_provider
+
+        loadtime = datetime.utcnow()
+        provider = get_provider(package)
+        manager = ResourceManager()
+        filesystem_bound = isinstance(provider, DefaultProvider)
+
+        def loader(path):
+            if path is None:
+                return None, None
+
+            path = posixpath.join(package_path, path)
+
+            if not provider.has_resource(path):
+                return None, None
+
+            basename = posixpath.basename(path)
+
+            if filesystem_bound:
+                return (
+                    basename,
+                    self._opener(provider.get_resource_filename(manager, path)),
+                )
+
+            s = provider.get_resource_string(manager, path)
+            return basename, lambda: (BytesIO(s), loadtime, len(s))
+
+        return loader
+
+    def get_directory_loader(self, directory):
+        def loader(path):
+            if path is not None:
+                path = os.path.join(directory, path)
+            else:
+                path = directory
+
+            if os.path.isfile(path):
+                return os.path.basename(path), self._opener(path)
+
+            return None, None
+
+        return loader
+
+    def generate_etag(self, mtime, file_size, real_filename):
+        if not isinstance(real_filename, bytes):
+            real_filename = real_filename.encode(get_filesystem_encoding())
+
+        return "wzsdm-%d-%s-%s" % (
+            mktime(mtime.timetuple()),
+            file_size,
+            adler32(real_filename) & 0xFFFFFFFF,
+        )
+
+    def __call__(self, environ, start_response):
+        cleaned_path = get_path_info(environ)
+
+        if PY2:
+            cleaned_path = cleaned_path.encode(get_filesystem_encoding())
+
+        # sanitize the path for non unix systems
+        cleaned_path = cleaned_path.strip("/")
+
+        for sep in os.sep, os.altsep:
+            if sep and sep != "/":
+                cleaned_path = cleaned_path.replace(sep, "/")
+
+        path = "/" + "/".join(x for x in cleaned_path.split("/") if x and x != "..")
+        file_loader = None
+
+        for search_path, loader in self.exports:
+            if search_path == path:
+                real_filename, file_loader = loader(None)
+
+                if file_loader is not None:
+                    break
+
+            if not search_path.endswith("/"):
+                search_path += "/"
+
+            if path.startswith(search_path):
+                real_filename, file_loader = loader(path[len(search_path) :])
+
+                if file_loader is not None:
+                    break
+
+        if file_loader is None or not self.is_allowed(real_filename):
+            return self.app(environ, start_response)
+
+        guessed_type = mimetypes.guess_type(real_filename)
+        mime_type = guessed_type[0] or self.fallback_mimetype
+        f, mtime, file_size = file_loader()
+
+        headers = [("Date", http_date())]
+
+        if self.cache:
+            timeout = self.cache_timeout
+            etag = self.generate_etag(mtime, file_size, real_filename)
+            headers += [
+                ("Etag", '"%s"' % etag),
+                ("Cache-Control", "max-age=%d, public" % timeout),
+            ]
+
+            if not is_resource_modified(environ, etag, last_modified=mtime):
+                f.close()
+                start_response("304 Not Modified", headers)
+                return []
+
+            headers.append(("Expires", http_date(time() + timeout)))
+        else:
+            headers.append(("Cache-Control", "public"))
+
+        headers.extend(
+            (
+                ("Content-Type", mime_type),
+                ("Content-Length", str(file_size)),
+                ("Last-Modified", http_date(mtime)),
+            )
+        )
+        start_response("200 OK", headers)
+        return wrap_file(environ, f)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/posixemulation.py b/venv/lib/python3.7/site-packages/werkzeug/posixemulation.py
new file mode 100644
index 0000000..696b456
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/posixemulation.py
@@ -0,0 +1,117 @@
+# -*- coding: utf-8 -*-
+r"""
+    werkzeug.posixemulation
+    ~~~~~~~~~~~~~~~~~~~~~~~
+
+    Provides a POSIX emulation for some features that are relevant to
+    web applications.  The main purpose is to simplify support for
+    systems such as Windows NT that are not 100% POSIX compatible.
+
+    Currently this only implements a :func:`rename` function that
+    follows POSIX semantics.  Eg: if the target file already exists it
+    will be replaced without asking.
+
+    This module was introduced in 0.6.1 and is not a public interface.
+    It might become one in later versions of Werkzeug.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import errno
+import os
+import random
+import sys
+import time
+
+from ._compat import to_unicode
+from .filesystem import get_filesystem_encoding
+
+can_rename_open_file = False
+
+if os.name == "nt":
+    try:
+        import ctypes
+
+        _MOVEFILE_REPLACE_EXISTING = 0x1
+        _MOVEFILE_WRITE_THROUGH = 0x8
+        _MoveFileEx = ctypes.windll.kernel32.MoveFileExW
+
+        def _rename(src, dst):
+            src = to_unicode(src, get_filesystem_encoding())
+            dst = to_unicode(dst, get_filesystem_encoding())
+            if _rename_atomic(src, dst):
+                return True
+            retry = 0
+            rv = False
+            while not rv and retry < 100:
+                rv = _MoveFileEx(
+                    src, dst, _MOVEFILE_REPLACE_EXISTING | _MOVEFILE_WRITE_THROUGH
+                )
+                if not rv:
+                    time.sleep(0.001)
+                    retry += 1
+            return rv
+
+        # new in Vista and Windows Server 2008
+        _CreateTransaction = ctypes.windll.ktmw32.CreateTransaction
+        _CommitTransaction = ctypes.windll.ktmw32.CommitTransaction
+        _MoveFileTransacted = ctypes.windll.kernel32.MoveFileTransactedW
+        _CloseHandle = ctypes.windll.kernel32.CloseHandle
+        can_rename_open_file = True
+
+        def _rename_atomic(src, dst):
+            ta = _CreateTransaction(None, 0, 0, 0, 0, 1000, "Werkzeug rename")
+            if ta == -1:
+                return False
+            try:
+                retry = 0
+                rv = False
+                while not rv and retry < 100:
+                    rv = _MoveFileTransacted(
+                        src,
+                        dst,
+                        None,
+                        None,
+                        _MOVEFILE_REPLACE_EXISTING | _MOVEFILE_WRITE_THROUGH,
+                        ta,
+                    )
+                    if rv:
+                        rv = _CommitTransaction(ta)
+                        break
+                    else:
+                        time.sleep(0.001)
+                        retry += 1
+                return rv
+            finally:
+                _CloseHandle(ta)
+
+    except Exception:
+
+        def _rename(src, dst):
+            return False
+
+        def _rename_atomic(src, dst):
+            return False
+
+    def rename(src, dst):
+        # Try atomic or pseudo-atomic rename
+        if _rename(src, dst):
+            return
+        # Fall back to "move away and replace"
+        try:
+            os.rename(src, dst)
+        except OSError as e:
+            if e.errno != errno.EEXIST:
+                raise
+            old = "%s-%08x" % (dst, random.randint(0, sys.maxsize))
+            os.rename(dst, old)
+            os.rename(src, dst)
+            try:
+                os.unlink(old)
+            except Exception:
+                pass
+
+
+else:
+    rename = os.rename
+    can_rename_open_file = True
diff --git a/venv/lib/python3.7/site-packages/werkzeug/routing.py b/venv/lib/python3.7/site-packages/werkzeug/routing.py
new file mode 100644
index 0000000..6b1dd98
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/routing.py
@@ -0,0 +1,2026 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.routing
+    ~~~~~~~~~~~~~~~~
+
+    When it comes to combining multiple controller or view functions (however
+    you want to call them) you need a dispatcher.  A simple way would be
+    applying regular expression tests on the ``PATH_INFO`` and calling
+    registered callback functions that return the value then.
+
+    This module implements a much more powerful system than simple regular
+    expression matching because it can also convert values in the URLs and
+    build URLs.
+
+    Here a simple example that creates an URL map for an application with
+    two subdomains (www and kb) and some URL rules:
+
+    >>> m = Map([
+    ...     # Static URLs
+    ...     Rule('/', endpoint='static/index'),
+    ...     Rule('/about', endpoint='static/about'),
+    ...     Rule('/help', endpoint='static/help'),
+    ...     # Knowledge Base
+    ...     Subdomain('kb', [
+    ...         Rule('/', endpoint='kb/index'),
+    ...         Rule('/browse/', endpoint='kb/browse'),
+    ...         Rule('/browse//', endpoint='kb/browse'),
+    ...         Rule('/browse//', endpoint='kb/browse')
+    ...     ])
+    ... ], default_subdomain='www')
+
+    If the application doesn't use subdomains it's perfectly fine to not set
+    the default subdomain and not use the `Subdomain` rule factory.  The endpoint
+    in the rules can be anything, for example import paths or unique
+    identifiers.  The WSGI application can use those endpoints to get the
+    handler for that URL.  It doesn't have to be a string at all but it's
+    recommended.
+
+    Now it's possible to create a URL adapter for one of the subdomains and
+    build URLs:
+
+    >>> c = m.bind('example.com')
+    >>> c.build("kb/browse", dict(id=42))
+    'http://kb.example.com/browse/42/'
+    >>> c.build("kb/browse", dict())
+    'http://kb.example.com/browse/'
+    >>> c.build("kb/browse", dict(id=42, page=3))
+    'http://kb.example.com/browse/42/3'
+    >>> c.build("static/about")
+    '/about'
+    >>> c.build("static/index", force_external=True)
+    'http://www.example.com/'
+
+    >>> c = m.bind('example.com', subdomain='kb')
+    >>> c.build("static/about")
+    'http://www.example.com/about'
+
+    The first argument to bind is the server name *without* the subdomain.
+    Per default it will assume that the script is mounted on the root, but
+    often that's not the case so you can provide the real mount point as
+    second argument:
+
+    >>> c = m.bind('example.com', '/applications/example')
+
+    The third argument can be the subdomain, if not given the default
+    subdomain is used.  For more details about binding have a look at the
+    documentation of the `MapAdapter`.
+
+    And here is how you can match URLs:
+
+    >>> c = m.bind('example.com')
+    >>> c.match("/")
+    ('static/index', {})
+    >>> c.match("/about")
+    ('static/about', {})
+    >>> c = m.bind('example.com', '/', 'kb')
+    >>> c.match("/")
+    ('kb/index', {})
+    >>> c.match("/browse/42/23")
+    ('kb/browse', {'id': 42, 'page': 23})
+
+    If matching fails you get a `NotFound` exception, if the rule thinks
+    it's a good idea to redirect (for example because the URL was defined
+    to have a slash at the end but the request was missing that slash) it
+    will raise a `RequestRedirect` exception.  Both are subclasses of the
+    `HTTPException` so you can use those errors as responses in the
+    application.
+
+    If matching succeeded but the URL rule was incompatible to the given
+    method (for example there were only rules for `GET` and `HEAD` and
+    routing system tried to match a `POST` request) a `MethodNotAllowed`
+    exception is raised.
+
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import ast
+import difflib
+import posixpath
+import re
+import uuid
+from pprint import pformat
+from threading import Lock
+
+from ._compat import implements_to_string
+from ._compat import iteritems
+from ._compat import itervalues
+from ._compat import native_string_result
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import to_bytes
+from ._compat import to_unicode
+from ._compat import wsgi_decoding_dance
+from ._internal import _encode_idna
+from ._internal import _get_environ
+from .datastructures import ImmutableDict
+from .datastructures import MultiDict
+from .exceptions import BadHost
+from .exceptions import HTTPException
+from .exceptions import MethodNotAllowed
+from .exceptions import NotFound
+from .urls import _fast_url_quote
+from .urls import url_encode
+from .urls import url_join
+from .urls import url_quote
+from .utils import cached_property
+from .utils import format_string
+from .utils import redirect
+from .wsgi import get_host
+
+_rule_re = re.compile(
+    r"""
+    (?P[^<]*)                           # static rule data
+    <
+    (?:
+        (?P[a-zA-Z_][a-zA-Z0-9_]*)   # converter name
+        (?:\((?P.*?)\))?                  # converter arguments
+        \:                                      # variable delimiter
+    )?
+    (?P[a-zA-Z_][a-zA-Z0-9_]*)        # variable name
+    >
+    """,
+    re.VERBOSE,
+)
+_simple_rule_re = re.compile(r"<([^>]+)>")
+_converter_args_re = re.compile(
+    r"""
+    ((?P\w+)\s*=\s*)?
+    (?P
+        True|False|
+        \d+.\d+|
+        \d+.|
+        \d+|
+        [\w\d_.]+|
+        [urUR]?(?P"[^"]*?"|'[^']*')
+    )\s*,
+    """,
+    re.VERBOSE | re.UNICODE,
+)
+
+
+_PYTHON_CONSTANTS = {"None": None, "True": True, "False": False}
+
+
+def _pythonize(value):
+    if value in _PYTHON_CONSTANTS:
+        return _PYTHON_CONSTANTS[value]
+    for convert in int, float:
+        try:
+            return convert(value)
+        except ValueError:
+            pass
+    if value[:1] == value[-1:] and value[0] in "\"'":
+        value = value[1:-1]
+    return text_type(value)
+
+
+def parse_converter_args(argstr):
+    argstr += ","
+    args = []
+    kwargs = {}
+
+    for item in _converter_args_re.finditer(argstr):
+        value = item.group("stringval")
+        if value is None:
+            value = item.group("value")
+        value = _pythonize(value)
+        if not item.group("name"):
+            args.append(value)
+        else:
+            name = item.group("name")
+            kwargs[name] = value
+
+    return tuple(args), kwargs
+
+
+def parse_rule(rule):
+    """Parse a rule and return it as generator. Each iteration yields tuples
+    in the form ``(converter, arguments, variable)``. If the converter is
+    `None` it's a static url part, otherwise it's a dynamic one.
+
+    :internal:
+    """
+    pos = 0
+    end = len(rule)
+    do_match = _rule_re.match
+    used_names = set()
+    while pos < end:
+        m = do_match(rule, pos)
+        if m is None:
+            break
+        data = m.groupdict()
+        if data["static"]:
+            yield None, None, data["static"]
+        variable = data["variable"]
+        converter = data["converter"] or "default"
+        if variable in used_names:
+            raise ValueError("variable name %r used twice." % variable)
+        used_names.add(variable)
+        yield converter, data["args"] or None, variable
+        pos = m.end()
+    if pos < end:
+        remaining = rule[pos:]
+        if ">" in remaining or "<" in remaining:
+            raise ValueError("malformed url rule: %r" % rule)
+        yield None, None, remaining
+
+
+class RoutingException(Exception):
+    """Special exceptions that require the application to redirect, notifying
+    about missing urls, etc.
+
+    :internal:
+    """
+
+
+class RequestRedirect(HTTPException, RoutingException):
+    """Raise if the map requests a redirect. This is for example the case if
+    `strict_slashes` are activated and an url that requires a trailing slash.
+
+    The attribute `new_url` contains the absolute destination url.
+    """
+
+    code = 308
+
+    def __init__(self, new_url):
+        RoutingException.__init__(self, new_url)
+        self.new_url = new_url
+
+    def get_response(self, environ):
+        return redirect(self.new_url, self.code)
+
+
+class RequestSlash(RoutingException):
+    """Internal exception."""
+
+
+class RequestAliasRedirect(RoutingException):  # noqa: B903
+    """This rule is an alias and wants to redirect to the canonical URL."""
+
+    def __init__(self, matched_values):
+        self.matched_values = matched_values
+
+
+@implements_to_string
+class BuildError(RoutingException, LookupError):
+    """Raised if the build system cannot find a URL for an endpoint with the
+    values provided.
+    """
+
+    def __init__(self, endpoint, values, method, adapter=None):
+        LookupError.__init__(self, endpoint, values, method)
+        self.endpoint = endpoint
+        self.values = values
+        self.method = method
+        self.adapter = adapter
+
+    @cached_property
+    def suggested(self):
+        return self.closest_rule(self.adapter)
+
+    def closest_rule(self, adapter):
+        def _score_rule(rule):
+            return sum(
+                [
+                    0.98
+                    * difflib.SequenceMatcher(
+                        None, rule.endpoint, self.endpoint
+                    ).ratio(),
+                    0.01 * bool(set(self.values or ()).issubset(rule.arguments)),
+                    0.01 * bool(rule.methods and self.method in rule.methods),
+                ]
+            )
+
+        if adapter and adapter.map._rules:
+            return max(adapter.map._rules, key=_score_rule)
+
+    def __str__(self):
+        message = []
+        message.append("Could not build url for endpoint %r" % self.endpoint)
+        if self.method:
+            message.append(" (%r)" % self.method)
+        if self.values:
+            message.append(" with values %r" % sorted(self.values.keys()))
+        message.append(".")
+        if self.suggested:
+            if self.endpoint == self.suggested.endpoint:
+                if self.method and self.method not in self.suggested.methods:
+                    message.append(
+                        " Did you mean to use methods %r?"
+                        % sorted(self.suggested.methods)
+                    )
+                missing_values = self.suggested.arguments.union(
+                    set(self.suggested.defaults or ())
+                ) - set(self.values.keys())
+                if missing_values:
+                    message.append(
+                        " Did you forget to specify values %r?" % sorted(missing_values)
+                    )
+            else:
+                message.append(" Did you mean %r instead?" % self.suggested.endpoint)
+        return u"".join(message)
+
+
+class ValidationError(ValueError):
+    """Validation error.  If a rule converter raises this exception the rule
+    does not match the current URL and the next URL is tried.
+    """
+
+
+class RuleFactory(object):
+    """As soon as you have more complex URL setups it's a good idea to use rule
+    factories to avoid repetitive tasks.  Some of them are builtin, others can
+    be added by subclassing `RuleFactory` and overriding `get_rules`.
+    """
+
+    def get_rules(self, map):
+        """Subclasses of `RuleFactory` have to override this method and return
+        an iterable of rules."""
+        raise NotImplementedError()
+
+
+class Subdomain(RuleFactory):
+    """All URLs provided by this factory have the subdomain set to a
+    specific domain. For example if you want to use the subdomain for
+    the current language this can be a good setup::
+
+        url_map = Map([
+            Rule('/', endpoint='#select_language'),
+            Subdomain('', [
+                Rule('/', endpoint='index'),
+                Rule('/about', endpoint='about'),
+                Rule('/help', endpoint='help')
+            ])
+        ])
+
+    All the rules except for the ``'#select_language'`` endpoint will now
+    listen on a two letter long subdomain that holds the language code
+    for the current request.
+    """
+
+    def __init__(self, subdomain, rules):
+        self.subdomain = subdomain
+        self.rules = rules
+
+    def get_rules(self, map):
+        for rulefactory in self.rules:
+            for rule in rulefactory.get_rules(map):
+                rule = rule.empty()
+                rule.subdomain = self.subdomain
+                yield rule
+
+
+class Submount(RuleFactory):
+    """Like `Subdomain` but prefixes the URL rule with a given string::
+
+        url_map = Map([
+            Rule('/', endpoint='index'),
+            Submount('/blog', [
+                Rule('/', endpoint='blog/index'),
+                Rule('/entry/', endpoint='blog/show')
+            ])
+        ])
+
+    Now the rule ``'blog/show'`` matches ``/blog/entry/``.
+    """
+
+    def __init__(self, path, rules):
+        self.path = path.rstrip("/")
+        self.rules = rules
+
+    def get_rules(self, map):
+        for rulefactory in self.rules:
+            for rule in rulefactory.get_rules(map):
+                rule = rule.empty()
+                rule.rule = self.path + rule.rule
+                yield rule
+
+
+class EndpointPrefix(RuleFactory):
+    """Prefixes all endpoints (which must be strings for this factory) with
+    another string. This can be useful for sub applications::
+
+        url_map = Map([
+            Rule('/', endpoint='index'),
+            EndpointPrefix('blog/', [Submount('/blog', [
+                Rule('/', endpoint='index'),
+                Rule('/entry/', endpoint='show')
+            ])])
+        ])
+    """
+
+    def __init__(self, prefix, rules):
+        self.prefix = prefix
+        self.rules = rules
+
+    def get_rules(self, map):
+        for rulefactory in self.rules:
+            for rule in rulefactory.get_rules(map):
+                rule = rule.empty()
+                rule.endpoint = self.prefix + rule.endpoint
+                yield rule
+
+
+class RuleTemplate(object):
+    """Returns copies of the rules wrapped and expands string templates in
+    the endpoint, rule, defaults or subdomain sections.
+
+    Here a small example for such a rule template::
+
+        from werkzeug.routing import Map, Rule, RuleTemplate
+
+        resource = RuleTemplate([
+            Rule('/$name/', endpoint='$name.list'),
+            Rule('/$name/', endpoint='$name.show')
+        ])
+
+        url_map = Map([resource(name='user'), resource(name='page')])
+
+    When a rule template is called the keyword arguments are used to
+    replace the placeholders in all the string parameters.
+    """
+
+    def __init__(self, rules):
+        self.rules = list(rules)
+
+    def __call__(self, *args, **kwargs):
+        return RuleTemplateFactory(self.rules, dict(*args, **kwargs))
+
+
+class RuleTemplateFactory(RuleFactory):
+    """A factory that fills in template variables into rules.  Used by
+    `RuleTemplate` internally.
+
+    :internal:
+    """
+
+    def __init__(self, rules, context):
+        self.rules = rules
+        self.context = context
+
+    def get_rules(self, map):
+        for rulefactory in self.rules:
+            for rule in rulefactory.get_rules(map):
+                new_defaults = subdomain = None
+                if rule.defaults:
+                    new_defaults = {}
+                    for key, value in iteritems(rule.defaults):
+                        if isinstance(value, string_types):
+                            value = format_string(value, self.context)
+                        new_defaults[key] = value
+                if rule.subdomain is not None:
+                    subdomain = format_string(rule.subdomain, self.context)
+                new_endpoint = rule.endpoint
+                if isinstance(new_endpoint, string_types):
+                    new_endpoint = format_string(new_endpoint, self.context)
+                yield Rule(
+                    format_string(rule.rule, self.context),
+                    new_defaults,
+                    subdomain,
+                    rule.methods,
+                    rule.build_only,
+                    new_endpoint,
+                    rule.strict_slashes,
+                )
+
+
+def _prefix_names(src):
+    """ast parse and prefix names with `.` to avoid collision with user vars"""
+    tree = ast.parse(src).body[0]
+    if isinstance(tree, ast.Expr):
+        tree = tree.value
+    for node in ast.walk(tree):
+        if isinstance(node, ast.Name):
+            node.id = "." + node.id
+    return tree
+
+
+_CALL_CONVERTER_CODE_FMT = "self._converters[{elem!r}].to_url()"
+_IF_KWARGS_URL_ENCODE_CODE = """\
+if kwargs:
+    q = '?'
+    params = self._encode_query_vars(kwargs)
+else:
+    q = params = ''
+"""
+_IF_KWARGS_URL_ENCODE_AST = _prefix_names(_IF_KWARGS_URL_ENCODE_CODE)
+_URL_ENCODE_AST_NAMES = (_prefix_names("q"), _prefix_names("params"))
+
+
+@implements_to_string
+class Rule(RuleFactory):
+    """A Rule represents one URL pattern.  There are some options for `Rule`
+    that change the way it behaves and are passed to the `Rule` constructor.
+    Note that besides the rule-string all arguments *must* be keyword arguments
+    in order to not break the application on Werkzeug upgrades.
+
+    `string`
+        Rule strings basically are just normal URL paths with placeholders in
+        the format ```` where the converter and the
+        arguments are optional.  If no converter is defined the `default`
+        converter is used which means `string` in the normal configuration.
+
+        URL rules that end with a slash are branch URLs, others are leaves.
+        If you have `strict_slashes` enabled (which is the default), all
+        branch URLs that are matched without a trailing slash will trigger a
+        redirect to the same URL with the missing slash appended.
+
+        The converters are defined on the `Map`.
+
+    `endpoint`
+        The endpoint for this rule. This can be anything. A reference to a
+        function, a string, a number etc.  The preferred way is using a string
+        because the endpoint is used for URL generation.
+
+    `defaults`
+        An optional dict with defaults for other rules with the same endpoint.
+        This is a bit tricky but useful if you want to have unique URLs::
+
+            url_map = Map([
+                Rule('/all/', defaults={'page': 1}, endpoint='all_entries'),
+                Rule('/all/page/', endpoint='all_entries')
+            ])
+
+        If a user now visits ``http://example.com/all/page/1`` he will be
+        redirected to ``http://example.com/all/``.  If `redirect_defaults` is
+        disabled on the `Map` instance this will only affect the URL
+        generation.
+
+    `subdomain`
+        The subdomain rule string for this rule. If not specified the rule
+        only matches for the `default_subdomain` of the map.  If the map is
+        not bound to a subdomain this feature is disabled.
+
+        Can be useful if you want to have user profiles on different subdomains
+        and all subdomains are forwarded to your application::
+
+            url_map = Map([
+                Rule('/', subdomain='', endpoint='user/homepage'),
+                Rule('/stats', subdomain='', endpoint='user/stats')
+            ])
+
+    `methods`
+        A sequence of http methods this rule applies to.  If not specified, all
+        methods are allowed. For example this can be useful if you want different
+        endpoints for `POST` and `GET`.  If methods are defined and the path
+        matches but the method matched against is not in this list or in the
+        list of another rule for that path the error raised is of the type
+        `MethodNotAllowed` rather than `NotFound`.  If `GET` is present in the
+        list of methods and `HEAD` is not, `HEAD` is added automatically.
+
+        .. versionchanged:: 0.6.1
+           `HEAD` is now automatically added to the methods if `GET` is
+           present.  The reason for this is that existing code often did not
+           work properly in servers not rewriting `HEAD` to `GET`
+           automatically and it was not documented how `HEAD` should be
+           treated.  This was considered a bug in Werkzeug because of that.
+
+    `strict_slashes`
+        Override the `Map` setting for `strict_slashes` only for this rule. If
+        not specified the `Map` setting is used.
+
+    `build_only`
+        Set this to True and the rule will never match but will create a URL
+        that can be build. This is useful if you have resources on a subdomain
+        or folder that are not handled by the WSGI application (like static data)
+
+    `redirect_to`
+        If given this must be either a string or callable.  In case of a
+        callable it's called with the url adapter that triggered the match and
+        the values of the URL as keyword arguments and has to return the target
+        for the redirect, otherwise it has to be a string with placeholders in
+        rule syntax::
+
+            def foo_with_slug(adapter, id):
+                # ask the database for the slug for the old id.  this of
+                # course has nothing to do with werkzeug.
+                return 'foo/' + Foo.get_slug_for_id(id)
+
+            url_map = Map([
+                Rule('/foo/', endpoint='foo'),
+                Rule('/some/old/url/', redirect_to='foo/'),
+                Rule('/other/old/url/', redirect_to=foo_with_slug)
+            ])
+
+        When the rule is matched the routing system will raise a
+        `RequestRedirect` exception with the target for the redirect.
+
+        Keep in mind that the URL will be joined against the URL root of the
+        script so don't use a leading slash on the target URL unless you
+        really mean root of that domain.
+
+    `alias`
+        If enabled this rule serves as an alias for another rule with the same
+        endpoint and arguments.
+
+    `host`
+        If provided and the URL map has host matching enabled this can be
+        used to provide a match rule for the whole host.  This also means
+        that the subdomain feature is disabled.
+
+    .. versionadded:: 0.7
+       The `alias` and `host` parameters were added.
+    """
+
+    def __init__(
+        self,
+        string,
+        defaults=None,
+        subdomain=None,
+        methods=None,
+        build_only=False,
+        endpoint=None,
+        strict_slashes=None,
+        redirect_to=None,
+        alias=False,
+        host=None,
+    ):
+        if not string.startswith("/"):
+            raise ValueError("urls must start with a leading slash")
+        self.rule = string
+        self.is_leaf = not string.endswith("/")
+
+        self.map = None
+        self.strict_slashes = strict_slashes
+        self.subdomain = subdomain
+        self.host = host
+        self.defaults = defaults
+        self.build_only = build_only
+        self.alias = alias
+        if methods is None:
+            self.methods = None
+        else:
+            if isinstance(methods, str):
+                raise TypeError("param `methods` should be `Iterable[str]`, not `str`")
+            self.methods = set([x.upper() for x in methods])
+            if "HEAD" not in self.methods and "GET" in self.methods:
+                self.methods.add("HEAD")
+        self.endpoint = endpoint
+        self.redirect_to = redirect_to
+
+        if defaults:
+            self.arguments = set(map(str, defaults))
+        else:
+            self.arguments = set()
+        self._trace = self._converters = self._regex = self._argument_weights = None
+
+    def empty(self):
+        """
+        Return an unbound copy of this rule.
+
+        This can be useful if want to reuse an already bound URL for another
+        map.  See ``get_empty_kwargs`` to override what keyword arguments are
+        provided to the new copy.
+        """
+        return type(self)(self.rule, **self.get_empty_kwargs())
+
+    def get_empty_kwargs(self):
+        """
+        Provides kwargs for instantiating empty copy with empty()
+
+        Use this method to provide custom keyword arguments to the subclass of
+        ``Rule`` when calling ``some_rule.empty()``.  Helpful when the subclass
+        has custom keyword arguments that are needed at instantiation.
+
+        Must return a ``dict`` that will be provided as kwargs to the new
+        instance of ``Rule``, following the initial ``self.rule`` value which
+        is always provided as the first, required positional argument.
+        """
+        defaults = None
+        if self.defaults:
+            defaults = dict(self.defaults)
+        return dict(
+            defaults=defaults,
+            subdomain=self.subdomain,
+            methods=self.methods,
+            build_only=self.build_only,
+            endpoint=self.endpoint,
+            strict_slashes=self.strict_slashes,
+            redirect_to=self.redirect_to,
+            alias=self.alias,
+            host=self.host,
+        )
+
+    def get_rules(self, map):
+        yield self
+
+    def refresh(self):
+        """Rebinds and refreshes the URL.  Call this if you modified the
+        rule in place.
+
+        :internal:
+        """
+        self.bind(self.map, rebind=True)
+
+    def bind(self, map, rebind=False):
+        """Bind the url to a map and create a regular expression based on
+        the information from the rule itself and the defaults from the map.
+
+        :internal:
+        """
+        if self.map is not None and not rebind:
+            raise RuntimeError("url rule %r already bound to map %r" % (self, self.map))
+        self.map = map
+        if self.strict_slashes is None:
+            self.strict_slashes = map.strict_slashes
+        if self.subdomain is None:
+            self.subdomain = map.default_subdomain
+        self.compile()
+
+    def get_converter(self, variable_name, converter_name, args, kwargs):
+        """Looks up the converter for the given parameter.
+
+        .. versionadded:: 0.9
+        """
+        if converter_name not in self.map.converters:
+            raise LookupError("the converter %r does not exist" % converter_name)
+        return self.map.converters[converter_name](self.map, *args, **kwargs)
+
+    def _encode_query_vars(self, query_vars):
+        return url_encode(
+            query_vars,
+            charset=self.map.charset,
+            sort=self.map.sort_parameters,
+            key=self.map.sort_key,
+        )
+
+    def compile(self):
+        """Compiles the regular expression and stores it."""
+        assert self.map is not None, "rule not bound"
+
+        if self.map.host_matching:
+            domain_rule = self.host or ""
+        else:
+            domain_rule = self.subdomain or ""
+
+        self._trace = []
+        self._converters = {}
+        self._static_weights = []
+        self._argument_weights = []
+        regex_parts = []
+
+        def _build_regex(rule):
+            index = 0
+            for converter, arguments, variable in parse_rule(rule):
+                if converter is None:
+                    regex_parts.append(re.escape(variable))
+                    self._trace.append((False, variable))
+                    for part in variable.split("/"):
+                        if part:
+                            self._static_weights.append((index, -len(part)))
+                else:
+                    if arguments:
+                        c_args, c_kwargs = parse_converter_args(arguments)
+                    else:
+                        c_args = ()
+                        c_kwargs = {}
+                    convobj = self.get_converter(variable, converter, c_args, c_kwargs)
+                    regex_parts.append("(?P<%s>%s)" % (variable, convobj.regex))
+                    self._converters[variable] = convobj
+                    self._trace.append((True, variable))
+                    self._argument_weights.append(convobj.weight)
+                    self.arguments.add(str(variable))
+                index = index + 1
+
+        _build_regex(domain_rule)
+        regex_parts.append("\\|")
+        self._trace.append((False, "|"))
+        _build_regex(self.rule if self.is_leaf else self.rule.rstrip("/"))
+        if not self.is_leaf:
+            self._trace.append((False, "/"))
+
+        self._build = self._compile_builder(False).__get__(self, None)
+        self._build_unknown = self._compile_builder(True).__get__(self, None)
+
+        if self.build_only:
+            return
+        regex = r"^%s%s$" % (
+            u"".join(regex_parts),
+            (not self.is_leaf or not self.strict_slashes)
+            and "(?/?)"
+            or "",
+        )
+        self._regex = re.compile(regex, re.UNICODE)
+
+    def match(self, path, method=None):
+        """Check if the rule matches a given path. Path is a string in the
+        form ``"subdomain|/path"`` and is assembled by the map.  If
+        the map is doing host matching the subdomain part will be the host
+        instead.
+
+        If the rule matches a dict with the converted values is returned,
+        otherwise the return value is `None`.
+
+        :internal:
+        """
+        if not self.build_only:
+            m = self._regex.search(path)
+            if m is not None:
+                groups = m.groupdict()
+                # we have a folder like part of the url without a trailing
+                # slash and strict slashes enabled. raise an exception that
+                # tells the map to redirect to the same url but with a
+                # trailing slash
+                if (
+                    self.strict_slashes
+                    and not self.is_leaf
+                    and not groups.pop("__suffix__")
+                    and (
+                        method is None or self.methods is None or method in self.methods
+                    )
+                ):
+                    raise RequestSlash()
+                # if we are not in strict slashes mode we have to remove
+                # a __suffix__
+                elif not self.strict_slashes:
+                    del groups["__suffix__"]
+
+                result = {}
+                for name, value in iteritems(groups):
+                    try:
+                        value = self._converters[name].to_python(value)
+                    except ValidationError:
+                        return
+                    result[str(name)] = value
+                if self.defaults:
+                    result.update(self.defaults)
+
+                if self.alias and self.map.redirect_defaults:
+                    raise RequestAliasRedirect(result)
+
+                return result
+
+    @staticmethod
+    def _get_func_code(code, name):
+        globs, locs = {}, {}
+        exec(code, globs, locs)
+        return locs[name]
+
+    def _compile_builder(self, append_unknown=True):
+        defaults = self.defaults or {}
+        dom_ops = []
+        url_ops = []
+
+        opl = dom_ops
+        for is_dynamic, data in self._trace:
+            if data == "|" and opl is dom_ops:
+                opl = url_ops
+                continue
+            # this seems like a silly case to ever come up but:
+            # if a default is given for a value that appears in the rule,
+            # resolve it to a constant ahead of time
+            if is_dynamic and data in defaults:
+                data = self._converters[data].to_url(defaults[data])
+                opl.append((False, data))
+            elif not is_dynamic:
+                opl.append(
+                    (False, url_quote(to_bytes(data, self.map.charset), safe="/:|+"))
+                )
+            else:
+                opl.append((True, data))
+
+        def _convert(elem):
+            ret = _prefix_names(_CALL_CONVERTER_CODE_FMT.format(elem=elem))
+            ret.args = [ast.Name(str(elem), ast.Load())]  # str for py2
+            return ret
+
+        def _parts(ops):
+            parts = [
+                _convert(elem) if is_dynamic else ast.Str(s=elem)
+                for is_dynamic, elem in ops
+            ]
+            parts = parts or [ast.Str("")]
+            # constant fold
+            ret = [parts[0]]
+            for p in parts[1:]:
+                if isinstance(p, ast.Str) and isinstance(ret[-1], ast.Str):
+                    ret[-1] = ast.Str(ret[-1].s + p.s)
+                else:
+                    ret.append(p)
+            return ret
+
+        dom_parts = _parts(dom_ops)
+        url_parts = _parts(url_ops)
+        if not append_unknown:
+            body = []
+        else:
+            body = [_IF_KWARGS_URL_ENCODE_AST]
+            url_parts.extend(_URL_ENCODE_AST_NAMES)
+
+        def _join(parts):
+            if len(parts) == 1:  # shortcut
+                return parts[0]
+            elif hasattr(ast, "JoinedStr"):  # py36+
+                return ast.JoinedStr(parts)
+            else:
+                call = _prefix_names('"".join()')
+                call.args = [ast.Tuple(parts, ast.Load())]
+                return call
+
+        body.append(
+            ast.Return(ast.Tuple([_join(dom_parts), _join(url_parts)], ast.Load()))
+        )
+
+        # str is necessary for python2
+        pargs = [
+            str(elem)
+            for is_dynamic, elem in dom_ops + url_ops
+            if is_dynamic and elem not in defaults
+        ]
+        kargs = [str(k) for k in defaults]
+
+        func_ast = _prefix_names("def _(): pass")
+        func_ast.name = "".format(self.rule)
+        if hasattr(ast, "arg"):  # py3
+            func_ast.args.args.append(ast.arg(".self", None))
+            for arg in pargs + kargs:
+                func_ast.args.args.append(ast.arg(arg, None))
+            func_ast.args.kwarg = ast.arg(".kwargs", None)
+        else:
+            func_ast.args.args.append(ast.Name(".self", ast.Load()))
+            for arg in pargs + kargs:
+                func_ast.args.args.append(ast.Name(arg, ast.Load()))
+            func_ast.args.kwarg = ".kwargs"
+        for _ in kargs:
+            func_ast.args.defaults.append(ast.Str(""))
+        func_ast.body = body
+
+        module = ast.fix_missing_locations(ast.Module([func_ast]))
+        code = compile(module, "", "exec")
+        return self._get_func_code(code, func_ast.name)
+
+    def build(self, values, append_unknown=True):
+        """Assembles the relative url for that rule and the subdomain.
+        If building doesn't work for some reasons `None` is returned.
+
+        :internal:
+        """
+        try:
+            if append_unknown:
+                return self._build_unknown(**values)
+            else:
+                return self._build(**values)
+        except ValidationError:
+            return None
+
+    def provides_defaults_for(self, rule):
+        """Check if this rule has defaults for a given rule.
+
+        :internal:
+        """
+        return (
+            not self.build_only
+            and self.defaults
+            and self.endpoint == rule.endpoint
+            and self != rule
+            and self.arguments == rule.arguments
+        )
+
+    def suitable_for(self, values, method=None):
+        """Check if the dict of values has enough data for url generation.
+
+        :internal:
+        """
+        # if a method was given explicitly and that method is not supported
+        # by this rule, this rule is not suitable.
+        if (
+            method is not None
+            and self.methods is not None
+            and method not in self.methods
+        ):
+            return False
+
+        defaults = self.defaults or ()
+
+        # all arguments required must be either in the defaults dict or
+        # the value dictionary otherwise it's not suitable
+        for key in self.arguments:
+            if key not in defaults and key not in values:
+                return False
+
+        # in case defaults are given we ensure that either the value was
+        # skipped or the value is the same as the default value.
+        if defaults:
+            for key, value in iteritems(defaults):
+                if key in values and value != values[key]:
+                    return False
+
+        return True
+
+    def match_compare_key(self):
+        """The match compare key for sorting.
+
+        Current implementation:
+
+        1.  rules without any arguments come first for performance
+            reasons only as we expect them to match faster and some
+            common ones usually don't have any arguments (index pages etc.)
+        2.  rules with more static parts come first so the second argument
+            is the negative length of the number of the static weights.
+        3.  we order by static weights, which is a combination of index
+            and length
+        4.  The more complex rules come first so the next argument is the
+            negative length of the number of argument weights.
+        5.  lastly we order by the actual argument weights.
+
+        :internal:
+        """
+        return (
+            bool(self.arguments),
+            -len(self._static_weights),
+            self._static_weights,
+            -len(self._argument_weights),
+            self._argument_weights,
+        )
+
+    def build_compare_key(self):
+        """The build compare key for sorting.
+
+        :internal:
+        """
+        return 1 if self.alias else 0, -len(self.arguments), -len(self.defaults or ())
+
+    def __eq__(self, other):
+        return self.__class__ is other.__class__ and self._trace == other._trace
+
+    __hash__ = None
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def __str__(self):
+        return self.rule
+
+    @native_string_result
+    def __repr__(self):
+        if self.map is None:
+            return u"<%s (unbound)>" % self.__class__.__name__
+        tmp = []
+        for is_dynamic, data in self._trace:
+            if is_dynamic:
+                tmp.append(u"<%s>" % data)
+            else:
+                tmp.append(data)
+        return u"<%s %s%s -> %s>" % (
+            self.__class__.__name__,
+            repr((u"".join(tmp)).lstrip(u"|")).lstrip(u"u"),
+            self.methods is not None and u" (%s)" % u", ".join(self.methods) or u"",
+            self.endpoint,
+        )
+
+
+class BaseConverter(object):
+    """Base class for all converters."""
+
+    regex = "[^/]+"
+    weight = 100
+
+    def __init__(self, map):
+        self.map = map
+
+    def to_python(self, value):
+        return value
+
+    def to_url(self, value):
+        if isinstance(value, (bytes, bytearray)):
+            return _fast_url_quote(value)
+        return _fast_url_quote(text_type(value).encode(self.map.charset))
+
+
+class UnicodeConverter(BaseConverter):
+    """This converter is the default converter and accepts any string but
+    only one path segment.  Thus the string can not include a slash.
+
+    This is the default validator.
+
+    Example::
+
+        Rule('/pages/'),
+        Rule('/')
+
+    :param map: the :class:`Map`.
+    :param minlength: the minimum length of the string.  Must be greater
+                      or equal 1.
+    :param maxlength: the maximum length of the string.
+    :param length: the exact length of the string.
+    """
+
+    def __init__(self, map, minlength=1, maxlength=None, length=None):
+        BaseConverter.__init__(self, map)
+        if length is not None:
+            length = "{%d}" % int(length)
+        else:
+            if maxlength is None:
+                maxlength = ""
+            else:
+                maxlength = int(maxlength)
+            length = "{%s,%s}" % (int(minlength), maxlength)
+        self.regex = "[^/]" + length
+
+
+class AnyConverter(BaseConverter):
+    """Matches one of the items provided.  Items can either be Python
+    identifiers or strings::
+
+        Rule('/')
+
+    :param map: the :class:`Map`.
+    :param items: this function accepts the possible items as positional
+                  arguments.
+    """
+
+    def __init__(self, map, *items):
+        BaseConverter.__init__(self, map)
+        self.regex = "(?:%s)" % "|".join([re.escape(x) for x in items])
+
+
+class PathConverter(BaseConverter):
+    """Like the default :class:`UnicodeConverter`, but it also matches
+    slashes.  This is useful for wikis and similar applications::
+
+        Rule('/')
+        Rule('//edit')
+
+    :param map: the :class:`Map`.
+    """
+
+    regex = "[^/].*?"
+    weight = 200
+
+
+class NumberConverter(BaseConverter):
+    """Baseclass for `IntegerConverter` and `FloatConverter`.
+
+    :internal:
+    """
+
+    weight = 50
+
+    def __init__(self, map, fixed_digits=0, min=None, max=None, signed=False):
+        if signed:
+            self.regex = self.signed_regex
+        BaseConverter.__init__(self, map)
+        self.fixed_digits = fixed_digits
+        self.min = min
+        self.max = max
+        self.signed = signed
+
+    def to_python(self, value):
+        if self.fixed_digits and len(value) != self.fixed_digits:
+            raise ValidationError()
+        value = self.num_convert(value)
+        if (self.min is not None and value < self.min) or (
+            self.max is not None and value > self.max
+        ):
+            raise ValidationError()
+        return value
+
+    def to_url(self, value):
+        value = self.num_convert(value)
+        if self.fixed_digits:
+            value = ("%%0%sd" % self.fixed_digits) % value
+        return str(value)
+
+    @property
+    def signed_regex(self):
+        return r"-?" + self.regex
+
+
+class IntegerConverter(NumberConverter):
+    """This converter only accepts integer values::
+
+        Rule("/page/")
+
+    By default it only accepts unsigned, positive values. The ``signed``
+    parameter will enable signed, negative values. ::
+
+        Rule("/page/")
+
+    :param map: The :class:`Map`.
+    :param fixed_digits: The number of fixed digits in the URL. If you
+        set this to ``4`` for example, the rule will only match if the
+        URL looks like ``/0001/``. The default is variable length.
+    :param min: The minimal value.
+    :param max: The maximal value.
+    :param signed: Allow signed (negative) values.
+
+    .. versionadded:: 0.15
+        The ``signed`` parameter.
+    """
+
+    regex = r"\d+"
+    num_convert = int
+
+
+class FloatConverter(NumberConverter):
+    """This converter only accepts floating point values::
+
+        Rule("/probability/")
+
+    By default it only accepts unsigned, positive values. The ``signed``
+    parameter will enable signed, negative values. ::
+
+        Rule("/offset/")
+
+    :param map: The :class:`Map`.
+    :param min: The minimal value.
+    :param max: The maximal value.
+    :param signed: Allow signed (negative) values.
+
+    .. versionadded:: 0.15
+        The ``signed`` parameter.
+    """
+
+    regex = r"\d+\.\d+"
+    num_convert = float
+
+    def __init__(self, map, min=None, max=None, signed=False):
+        NumberConverter.__init__(self, map, min=min, max=max, signed=signed)
+
+
+class UUIDConverter(BaseConverter):
+    """This converter only accepts UUID strings::
+
+        Rule('/object/')
+
+    .. versionadded:: 0.10
+
+    :param map: the :class:`Map`.
+    """
+
+    regex = (
+        r"[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-"
+        r"[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}"
+    )
+
+    def to_python(self, value):
+        return uuid.UUID(value)
+
+    def to_url(self, value):
+        return str(value)
+
+
+#: the default converter mapping for the map.
+DEFAULT_CONVERTERS = {
+    "default": UnicodeConverter,
+    "string": UnicodeConverter,
+    "any": AnyConverter,
+    "path": PathConverter,
+    "int": IntegerConverter,
+    "float": FloatConverter,
+    "uuid": UUIDConverter,
+}
+
+
+class Map(object):
+    """The map class stores all the URL rules and some configuration
+    parameters.  Some of the configuration values are only stored on the
+    `Map` instance since those affect all rules, others are just defaults
+    and can be overridden for each rule.  Note that you have to specify all
+    arguments besides the `rules` as keyword arguments!
+
+    :param rules: sequence of url rules for this map.
+    :param default_subdomain: The default subdomain for rules without a
+                              subdomain defined.
+    :param charset: charset of the url. defaults to ``"utf-8"``
+    :param strict_slashes: Take care of trailing slashes.
+    :param redirect_defaults: This will redirect to the default rule if it
+                              wasn't visited that way. This helps creating
+                              unique URLs.
+    :param converters: A dict of converters that adds additional converters
+                       to the list of converters. If you redefine one
+                       converter this will override the original one.
+    :param sort_parameters: If set to `True` the url parameters are sorted.
+                            See `url_encode` for more details.
+    :param sort_key: The sort key function for `url_encode`.
+    :param encoding_errors: the error method to use for decoding
+    :param host_matching: if set to `True` it enables the host matching
+                          feature and disables the subdomain one.  If
+                          enabled the `host` parameter to rules is used
+                          instead of the `subdomain` one.
+
+    .. versionadded:: 0.5
+        `sort_parameters` and `sort_key` was added.
+
+    .. versionadded:: 0.7
+        `encoding_errors` and `host_matching` was added.
+    """
+
+    #: A dict of default converters to be used.
+    default_converters = ImmutableDict(DEFAULT_CONVERTERS)
+
+    def __init__(
+        self,
+        rules=None,
+        default_subdomain="",
+        charset="utf-8",
+        strict_slashes=True,
+        redirect_defaults=True,
+        converters=None,
+        sort_parameters=False,
+        sort_key=None,
+        encoding_errors="replace",
+        host_matching=False,
+    ):
+        self._rules = []
+        self._rules_by_endpoint = {}
+        self._remap = True
+        self._remap_lock = Lock()
+
+        self.default_subdomain = default_subdomain
+        self.charset = charset
+        self.encoding_errors = encoding_errors
+        self.strict_slashes = strict_slashes
+        self.redirect_defaults = redirect_defaults
+        self.host_matching = host_matching
+
+        self.converters = self.default_converters.copy()
+        if converters:
+            self.converters.update(converters)
+
+        self.sort_parameters = sort_parameters
+        self.sort_key = sort_key
+
+        for rulefactory in rules or ():
+            self.add(rulefactory)
+
+    def is_endpoint_expecting(self, endpoint, *arguments):
+        """Iterate over all rules and check if the endpoint expects
+        the arguments provided.  This is for example useful if you have
+        some URLs that expect a language code and others that do not and
+        you want to wrap the builder a bit so that the current language
+        code is automatically added if not provided but endpoints expect
+        it.
+
+        :param endpoint: the endpoint to check.
+        :param arguments: this function accepts one or more arguments
+                          as positional arguments.  Each one of them is
+                          checked.
+        """
+        self.update()
+        arguments = set(arguments)
+        for rule in self._rules_by_endpoint[endpoint]:
+            if arguments.issubset(rule.arguments):
+                return True
+        return False
+
+    def iter_rules(self, endpoint=None):
+        """Iterate over all rules or the rules of an endpoint.
+
+        :param endpoint: if provided only the rules for that endpoint
+                         are returned.
+        :return: an iterator
+        """
+        self.update()
+        if endpoint is not None:
+            return iter(self._rules_by_endpoint[endpoint])
+        return iter(self._rules)
+
+    def add(self, rulefactory):
+        """Add a new rule or factory to the map and bind it.  Requires that the
+        rule is not bound to another map.
+
+        :param rulefactory: a :class:`Rule` or :class:`RuleFactory`
+        """
+        for rule in rulefactory.get_rules(self):
+            rule.bind(self)
+            self._rules.append(rule)
+            self._rules_by_endpoint.setdefault(rule.endpoint, []).append(rule)
+        self._remap = True
+
+    def bind(
+        self,
+        server_name,
+        script_name=None,
+        subdomain=None,
+        url_scheme="http",
+        default_method="GET",
+        path_info=None,
+        query_args=None,
+    ):
+        """Return a new :class:`MapAdapter` with the details specified to the
+        call.  Note that `script_name` will default to ``'/'`` if not further
+        specified or `None`.  The `server_name` at least is a requirement
+        because the HTTP RFC requires absolute URLs for redirects and so all
+        redirect exceptions raised by Werkzeug will contain the full canonical
+        URL.
+
+        If no path_info is passed to :meth:`match` it will use the default path
+        info passed to bind.  While this doesn't really make sense for
+        manual bind calls, it's useful if you bind a map to a WSGI
+        environment which already contains the path info.
+
+        `subdomain` will default to the `default_subdomain` for this map if
+        no defined. If there is no `default_subdomain` you cannot use the
+        subdomain feature.
+
+        .. versionadded:: 0.7
+           `query_args` added
+
+        .. versionadded:: 0.8
+           `query_args` can now also be a string.
+
+        .. versionchanged:: 0.15
+            ``path_info`` defaults to ``'/'`` if ``None``.
+        """
+        server_name = server_name.lower()
+        if self.host_matching:
+            if subdomain is not None:
+                raise RuntimeError("host matching enabled and a subdomain was provided")
+        elif subdomain is None:
+            subdomain = self.default_subdomain
+        if script_name is None:
+            script_name = "/"
+        if path_info is None:
+            path_info = "/"
+        try:
+            server_name = _encode_idna(server_name)
+        except UnicodeError:
+            raise BadHost()
+        return MapAdapter(
+            self,
+            server_name,
+            script_name,
+            subdomain,
+            url_scheme,
+            path_info,
+            default_method,
+            query_args,
+        )
+
+    def bind_to_environ(self, environ, server_name=None, subdomain=None):
+        """Like :meth:`bind` but you can pass it an WSGI environment and it
+        will fetch the information from that dictionary.  Note that because of
+        limitations in the protocol there is no way to get the current
+        subdomain and real `server_name` from the environment.  If you don't
+        provide it, Werkzeug will use `SERVER_NAME` and `SERVER_PORT` (or
+        `HTTP_HOST` if provided) as used `server_name` with disabled subdomain
+        feature.
+
+        If `subdomain` is `None` but an environment and a server name is
+        provided it will calculate the current subdomain automatically.
+        Example: `server_name` is ``'example.com'`` and the `SERVER_NAME`
+        in the wsgi `environ` is ``'staging.dev.example.com'`` the calculated
+        subdomain will be ``'staging.dev'``.
+
+        If the object passed as environ has an environ attribute, the value of
+        this attribute is used instead.  This allows you to pass request
+        objects.  Additionally `PATH_INFO` added as a default of the
+        :class:`MapAdapter` so that you don't have to pass the path info to
+        the match method.
+
+        .. versionchanged:: 0.5
+            previously this method accepted a bogus `calculate_subdomain`
+            parameter that did not have any effect.  It was removed because
+            of that.
+
+        .. versionchanged:: 0.8
+           This will no longer raise a ValueError when an unexpected server
+           name was passed.
+
+        :param environ: a WSGI environment.
+        :param server_name: an optional server name hint (see above).
+        :param subdomain: optionally the current subdomain (see above).
+        """
+        environ = _get_environ(environ)
+
+        wsgi_server_name = get_host(environ).lower()
+
+        if server_name is None:
+            server_name = wsgi_server_name
+        else:
+            server_name = server_name.lower()
+
+        if subdomain is None and not self.host_matching:
+            cur_server_name = wsgi_server_name.split(".")
+            real_server_name = server_name.split(".")
+            offset = -len(real_server_name)
+            if cur_server_name[offset:] != real_server_name:
+                # This can happen even with valid configs if the server was
+                # accesssed directly by IP address under some situations.
+                # Instead of raising an exception like in Werkzeug 0.7 or
+                # earlier we go by an invalid subdomain which will result
+                # in a 404 error on matching.
+                subdomain = ""
+            else:
+                subdomain = ".".join(filter(None, cur_server_name[:offset]))
+
+        def _get_wsgi_string(name):
+            val = environ.get(name)
+            if val is not None:
+                return wsgi_decoding_dance(val, self.charset)
+
+        script_name = _get_wsgi_string("SCRIPT_NAME")
+        path_info = _get_wsgi_string("PATH_INFO")
+        query_args = _get_wsgi_string("QUERY_STRING")
+        return Map.bind(
+            self,
+            server_name,
+            script_name,
+            subdomain,
+            environ["wsgi.url_scheme"],
+            environ["REQUEST_METHOD"],
+            path_info,
+            query_args=query_args,
+        )
+
+    def update(self):
+        """Called before matching and building to keep the compiled rules
+        in the correct order after things changed.
+        """
+        if not self._remap:
+            return
+
+        with self._remap_lock:
+            if not self._remap:
+                return
+
+            self._rules.sort(key=lambda x: x.match_compare_key())
+            for rules in itervalues(self._rules_by_endpoint):
+                rules.sort(key=lambda x: x.build_compare_key())
+            self._remap = False
+
+    def __repr__(self):
+        rules = self.iter_rules()
+        return "%s(%s)" % (self.__class__.__name__, pformat(list(rules)))
+
+
+class MapAdapter(object):
+
+    """Returned by :meth:`Map.bind` or :meth:`Map.bind_to_environ` and does
+    the URL matching and building based on runtime information.
+    """
+
+    def __init__(
+        self,
+        map,
+        server_name,
+        script_name,
+        subdomain,
+        url_scheme,
+        path_info,
+        default_method,
+        query_args=None,
+    ):
+        self.map = map
+        self.server_name = to_unicode(server_name)
+        script_name = to_unicode(script_name)
+        if not script_name.endswith(u"/"):
+            script_name += u"/"
+        self.script_name = script_name
+        self.subdomain = to_unicode(subdomain)
+        self.url_scheme = to_unicode(url_scheme)
+        self.path_info = to_unicode(path_info)
+        self.default_method = to_unicode(default_method)
+        self.query_args = query_args
+
+    def dispatch(
+        self, view_func, path_info=None, method=None, catch_http_exceptions=False
+    ):
+        """Does the complete dispatching process.  `view_func` is called with
+        the endpoint and a dict with the values for the view.  It should
+        look up the view function, call it, and return a response object
+        or WSGI application.  http exceptions are not caught by default
+        so that applications can display nicer error messages by just
+        catching them by hand.  If you want to stick with the default
+        error messages you can pass it ``catch_http_exceptions=True`` and
+        it will catch the http exceptions.
+
+        Here a small example for the dispatch usage::
+
+            from werkzeug.wrappers import Request, Response
+            from werkzeug.wsgi import responder
+            from werkzeug.routing import Map, Rule
+
+            def on_index(request):
+                return Response('Hello from the index')
+
+            url_map = Map([Rule('/', endpoint='index')])
+            views = {'index': on_index}
+
+            @responder
+            def application(environ, start_response):
+                request = Request(environ)
+                urls = url_map.bind_to_environ(environ)
+                return urls.dispatch(lambda e, v: views[e](request, **v),
+                                     catch_http_exceptions=True)
+
+        Keep in mind that this method might return exception objects, too, so
+        use :class:`Response.force_type` to get a response object.
+
+        :param view_func: a function that is called with the endpoint as
+                          first argument and the value dict as second.  Has
+                          to dispatch to the actual view function with this
+                          information.  (see above)
+        :param path_info: the path info to use for matching.  Overrides the
+                          path info specified on binding.
+        :param method: the HTTP method used for matching.  Overrides the
+                       method specified on binding.
+        :param catch_http_exceptions: set to `True` to catch any of the
+                                      werkzeug :class:`HTTPException`\\s.
+        """
+        try:
+            try:
+                endpoint, args = self.match(path_info, method)
+            except RequestRedirect as e:
+                return e
+            return view_func(endpoint, args)
+        except HTTPException as e:
+            if catch_http_exceptions:
+                return e
+            raise
+
+    def match(self, path_info=None, method=None, return_rule=False, query_args=None):
+        """The usage is simple: you just pass the match method the current
+        path info as well as the method (which defaults to `GET`).  The
+        following things can then happen:
+
+        - you receive a `NotFound` exception that indicates that no URL is
+          matching.  A `NotFound` exception is also a WSGI application you
+          can call to get a default page not found page (happens to be the
+          same object as `werkzeug.exceptions.NotFound`)
+
+        - you receive a `MethodNotAllowed` exception that indicates that there
+          is a match for this URL but not for the current request method.
+          This is useful for RESTful applications.
+
+        - you receive a `RequestRedirect` exception with a `new_url`
+          attribute.  This exception is used to notify you about a request
+          Werkzeug requests from your WSGI application.  This is for example the
+          case if you request ``/foo`` although the correct URL is ``/foo/``
+          You can use the `RequestRedirect` instance as response-like object
+          similar to all other subclasses of `HTTPException`.
+
+        - you get a tuple in the form ``(endpoint, arguments)`` if there is
+          a match (unless `return_rule` is True, in which case you get a tuple
+          in the form ``(rule, arguments)``)
+
+        If the path info is not passed to the match method the default path
+        info of the map is used (defaults to the root URL if not defined
+        explicitly).
+
+        All of the exceptions raised are subclasses of `HTTPException` so they
+        can be used as WSGI responses. They will all render generic error or
+        redirect pages.
+
+        Here is a small example for matching:
+
+        >>> m = Map([
+        ...     Rule('/', endpoint='index'),
+        ...     Rule('/downloads/', endpoint='downloads/index'),
+        ...     Rule('/downloads/', endpoint='downloads/show')
+        ... ])
+        >>> urls = m.bind("example.com", "/")
+        >>> urls.match("/", "GET")
+        ('index', {})
+        >>> urls.match("/downloads/42")
+        ('downloads/show', {'id': 42})
+
+        And here is what happens on redirect and missing URLs:
+
+        >>> urls.match("/downloads")
+        Traceback (most recent call last):
+          ...
+        RequestRedirect: http://example.com/downloads/
+        >>> urls.match("/missing")
+        Traceback (most recent call last):
+          ...
+        NotFound: 404 Not Found
+
+        :param path_info: the path info to use for matching.  Overrides the
+                          path info specified on binding.
+        :param method: the HTTP method used for matching.  Overrides the
+                       method specified on binding.
+        :param return_rule: return the rule that matched instead of just the
+                            endpoint (defaults to `False`).
+        :param query_args: optional query arguments that are used for
+                           automatic redirects as string or dictionary.  It's
+                           currently not possible to use the query arguments
+                           for URL matching.
+
+        .. versionadded:: 0.6
+           `return_rule` was added.
+
+        .. versionadded:: 0.7
+           `query_args` was added.
+
+        .. versionchanged:: 0.8
+           `query_args` can now also be a string.
+        """
+        self.map.update()
+        if path_info is None:
+            path_info = self.path_info
+        else:
+            path_info = to_unicode(path_info, self.map.charset)
+        if query_args is None:
+            query_args = self.query_args
+        method = (method or self.default_method).upper()
+
+        path = u"%s|%s" % (
+            self.map.host_matching and self.server_name or self.subdomain,
+            path_info and "/%s" % path_info.lstrip("/"),
+        )
+
+        have_match_for = set()
+        for rule in self.map._rules:
+            try:
+                rv = rule.match(path, method)
+            except RequestSlash:
+                raise RequestRedirect(
+                    self.make_redirect_url(
+                        url_quote(path_info, self.map.charset, safe="/:|+") + "/",
+                        query_args,
+                    )
+                )
+            except RequestAliasRedirect as e:
+                raise RequestRedirect(
+                    self.make_alias_redirect_url(
+                        path, rule.endpoint, e.matched_values, method, query_args
+                    )
+                )
+            if rv is None:
+                continue
+            if rule.methods is not None and method not in rule.methods:
+                have_match_for.update(rule.methods)
+                continue
+
+            if self.map.redirect_defaults:
+                redirect_url = self.get_default_redirect(rule, method, rv, query_args)
+                if redirect_url is not None:
+                    raise RequestRedirect(redirect_url)
+
+            if rule.redirect_to is not None:
+                if isinstance(rule.redirect_to, string_types):
+
+                    def _handle_match(match):
+                        value = rv[match.group(1)]
+                        return rule._converters[match.group(1)].to_url(value)
+
+                    redirect_url = _simple_rule_re.sub(_handle_match, rule.redirect_to)
+                else:
+                    redirect_url = rule.redirect_to(self, **rv)
+                raise RequestRedirect(
+                    str(
+                        url_join(
+                            "%s://%s%s%s"
+                            % (
+                                self.url_scheme or "http",
+                                self.subdomain + "." if self.subdomain else "",
+                                self.server_name,
+                                self.script_name,
+                            ),
+                            redirect_url,
+                        )
+                    )
+                )
+
+            if return_rule:
+                return rule, rv
+            else:
+                return rule.endpoint, rv
+
+        if have_match_for:
+            raise MethodNotAllowed(valid_methods=list(have_match_for))
+        raise NotFound()
+
+    def test(self, path_info=None, method=None):
+        """Test if a rule would match.  Works like `match` but returns `True`
+        if the URL matches, or `False` if it does not exist.
+
+        :param path_info: the path info to use for matching.  Overrides the
+                          path info specified on binding.
+        :param method: the HTTP method used for matching.  Overrides the
+                       method specified on binding.
+        """
+        try:
+            self.match(path_info, method)
+        except RequestRedirect:
+            pass
+        except HTTPException:
+            return False
+        return True
+
+    def allowed_methods(self, path_info=None):
+        """Returns the valid methods that match for a given path.
+
+        .. versionadded:: 0.7
+        """
+        try:
+            self.match(path_info, method="--")
+        except MethodNotAllowed as e:
+            return e.valid_methods
+        except HTTPException:
+            pass
+        return []
+
+    def get_host(self, domain_part):
+        """Figures out the full host name for the given domain part.  The
+        domain part is a subdomain in case host matching is disabled or
+        a full host name.
+        """
+        if self.map.host_matching:
+            if domain_part is None:
+                return self.server_name
+            return to_unicode(domain_part, "ascii")
+        subdomain = domain_part
+        if subdomain is None:
+            subdomain = self.subdomain
+        else:
+            subdomain = to_unicode(subdomain, "ascii")
+        return (subdomain + u"." if subdomain else u"") + self.server_name
+
+    def get_default_redirect(self, rule, method, values, query_args):
+        """A helper that returns the URL to redirect to if it finds one.
+        This is used for default redirecting only.
+
+        :internal:
+        """
+        assert self.map.redirect_defaults
+        for r in self.map._rules_by_endpoint[rule.endpoint]:
+            # every rule that comes after this one, including ourself
+            # has a lower priority for the defaults.  We order the ones
+            # with the highest priority up for building.
+            if r is rule:
+                break
+            if r.provides_defaults_for(rule) and r.suitable_for(values, method):
+                values.update(r.defaults)
+                domain_part, path = r.build(values)
+                return self.make_redirect_url(path, query_args, domain_part=domain_part)
+
+    def encode_query_args(self, query_args):
+        if not isinstance(query_args, string_types):
+            query_args = url_encode(query_args, self.map.charset)
+        return query_args
+
+    def make_redirect_url(self, path_info, query_args=None, domain_part=None):
+        """Creates a redirect URL.
+
+        :internal:
+        """
+        suffix = ""
+        if query_args:
+            suffix = "?" + self.encode_query_args(query_args)
+        return str(
+            "%s://%s/%s%s"
+            % (
+                self.url_scheme or "http",
+                self.get_host(domain_part),
+                posixpath.join(
+                    self.script_name[:-1].lstrip("/"), path_info.lstrip("/")
+                ),
+                suffix,
+            )
+        )
+
+    def make_alias_redirect_url(self, path, endpoint, values, method, query_args):
+        """Internally called to make an alias redirect URL."""
+        url = self.build(
+            endpoint, values, method, append_unknown=False, force_external=True
+        )
+        if query_args:
+            url += "?" + self.encode_query_args(query_args)
+        assert url != path, "detected invalid alias setting. No canonical URL found"
+        return url
+
+    def _partial_build(self, endpoint, values, method, append_unknown):
+        """Helper for :meth:`build`.  Returns subdomain and path for the
+        rule that accepts this endpoint, values and method.
+
+        :internal:
+        """
+        # in case the method is none, try with the default method first
+        if method is None:
+            rv = self._partial_build(
+                endpoint, values, self.default_method, append_unknown
+            )
+            if rv is not None:
+                return rv
+
+        # default method did not match or a specific method is passed,
+        # check all and go with first result.
+        for rule in self.map._rules_by_endpoint.get(endpoint, ()):
+            if rule.suitable_for(values, method):
+                rv = rule.build(values, append_unknown)
+                if rv is not None:
+                    return rv
+
+    def build(
+        self,
+        endpoint,
+        values=None,
+        method=None,
+        force_external=False,
+        append_unknown=True,
+    ):
+        """Building URLs works pretty much the other way round.  Instead of
+        `match` you call `build` and pass it the endpoint and a dict of
+        arguments for the placeholders.
+
+        The `build` function also accepts an argument called `force_external`
+        which, if you set it to `True` will force external URLs. Per default
+        external URLs (include the server name) will only be used if the
+        target URL is on a different subdomain.
+
+        >>> m = Map([
+        ...     Rule('/', endpoint='index'),
+        ...     Rule('/downloads/', endpoint='downloads/index'),
+        ...     Rule('/downloads/', endpoint='downloads/show')
+        ... ])
+        >>> urls = m.bind("example.com", "/")
+        >>> urls.build("index", {})
+        '/'
+        >>> urls.build("downloads/show", {'id': 42})
+        '/downloads/42'
+        >>> urls.build("downloads/show", {'id': 42}, force_external=True)
+        'http://example.com/downloads/42'
+
+        Because URLs cannot contain non ASCII data you will always get
+        bytestrings back.  Non ASCII characters are urlencoded with the
+        charset defined on the map instance.
+
+        Additional values are converted to unicode and appended to the URL as
+        URL querystring parameters:
+
+        >>> urls.build("index", {'q': 'My Searchstring'})
+        '/?q=My+Searchstring'
+
+        When processing those additional values, lists are furthermore
+        interpreted as multiple values (as per
+        :py:class:`werkzeug.datastructures.MultiDict`):
+
+        >>> urls.build("index", {'q': ['a', 'b', 'c']})
+        '/?q=a&q=b&q=c'
+
+        Passing a ``MultiDict`` will also add multiple values:
+
+        >>> urls.build("index", MultiDict((('p', 'z'), ('q', 'a'), ('q', 'b'))))
+        '/?p=z&q=a&q=b'
+
+        If a rule does not exist when building a `BuildError` exception is
+        raised.
+
+        The build method accepts an argument called `method` which allows you
+        to specify the method you want to have an URL built for if you have
+        different methods for the same endpoint specified.
+
+        .. versionadded:: 0.6
+           the `append_unknown` parameter was added.
+
+        :param endpoint: the endpoint of the URL to build.
+        :param values: the values for the URL to build.  Unhandled values are
+                       appended to the URL as query parameters.
+        :param method: the HTTP method for the rule if there are different
+                       URLs for different methods on the same endpoint.
+        :param force_external: enforce full canonical external URLs. If the URL
+                               scheme is not provided, this will generate
+                               a protocol-relative URL.
+        :param append_unknown: unknown parameters are appended to the generated
+                               URL as query string argument.  Disable this
+                               if you want the builder to ignore those.
+        """
+        self.map.update()
+
+        if values:
+            if isinstance(values, MultiDict):
+                temp_values = {}
+                # iteritems(dict, values) is like `values.lists()`
+                # without the call or `list()` coercion overhead.
+                for key, value in iteritems(dict, values):
+                    if not value:
+                        continue
+                    if len(value) == 1:  # flatten single item lists
+                        value = value[0]
+                        if value is None:  # drop None
+                            continue
+                    temp_values[key] = value
+                values = temp_values
+            else:
+                # drop None
+                values = dict(i for i in iteritems(values) if i[1] is not None)
+        else:
+            values = {}
+
+        rv = self._partial_build(endpoint, values, method, append_unknown)
+        if rv is None:
+            raise BuildError(endpoint, values, method, self)
+        domain_part, path = rv
+
+        host = self.get_host(domain_part)
+
+        # shortcut this.
+        if not force_external and (
+            (self.map.host_matching and host == self.server_name)
+            or (not self.map.host_matching and domain_part == self.subdomain)
+        ):
+            return "%s/%s" % (self.script_name.rstrip("/"), path.lstrip("/"))
+        return str(
+            "%s//%s%s/%s"
+            % (
+                self.url_scheme + ":" if self.url_scheme else "",
+                host,
+                self.script_name[:-1],
+                path.lstrip("/"),
+            )
+        )
diff --git a/venv/lib/python3.7/site-packages/werkzeug/security.py b/venv/lib/python3.7/site-packages/werkzeug/security.py
new file mode 100644
index 0000000..1842afd
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/security.py
@@ -0,0 +1,241 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.security
+    ~~~~~~~~~~~~~~~~~
+
+    Security related helpers such as secure password hashing tools.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import codecs
+import hashlib
+import hmac
+import os
+import posixpath
+from random import SystemRandom
+from struct import Struct
+
+from ._compat import izip
+from ._compat import PY2
+from ._compat import range_type
+from ._compat import text_type
+from ._compat import to_bytes
+from ._compat import to_native
+
+SALT_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+DEFAULT_PBKDF2_ITERATIONS = 150000
+
+_pack_int = Struct(">I").pack
+_builtin_safe_str_cmp = getattr(hmac, "compare_digest", None)
+_sys_rng = SystemRandom()
+_os_alt_seps = list(
+    sep for sep in [os.path.sep, os.path.altsep] if sep not in (None, "/")
+)
+
+
+def pbkdf2_hex(
+    data, salt, iterations=DEFAULT_PBKDF2_ITERATIONS, keylen=None, hashfunc=None
+):
+    """Like :func:`pbkdf2_bin`, but returns a hex-encoded string.
+
+    .. versionadded:: 0.9
+
+    :param data: the data to derive.
+    :param salt: the salt for the derivation.
+    :param iterations: the number of iterations.
+    :param keylen: the length of the resulting key.  If not provided,
+                   the digest size will be used.
+    :param hashfunc: the hash function to use.  This can either be the
+                     string name of a known hash function, or a function
+                     from the hashlib module.  Defaults to sha256.
+    """
+    rv = pbkdf2_bin(data, salt, iterations, keylen, hashfunc)
+    return to_native(codecs.encode(rv, "hex_codec"))
+
+
+def pbkdf2_bin(
+    data, salt, iterations=DEFAULT_PBKDF2_ITERATIONS, keylen=None, hashfunc=None
+):
+    """Returns a binary digest for the PBKDF2 hash algorithm of `data`
+    with the given `salt`. It iterates `iterations` times and produces a
+    key of `keylen` bytes. By default, SHA-256 is used as hash function;
+    a different hashlib `hashfunc` can be provided.
+
+    .. versionadded:: 0.9
+
+    :param data: the data to derive.
+    :param salt: the salt for the derivation.
+    :param iterations: the number of iterations.
+    :param keylen: the length of the resulting key.  If not provided
+                   the digest size will be used.
+    :param hashfunc: the hash function to use.  This can either be the
+                     string name of a known hash function or a function
+                     from the hashlib module.  Defaults to sha256.
+    """
+    if not hashfunc:
+        hashfunc = "sha256"
+
+    data = to_bytes(data)
+    salt = to_bytes(salt)
+
+    if callable(hashfunc):
+        _test_hash = hashfunc()
+        hash_name = getattr(_test_hash, "name", None)
+    else:
+        hash_name = hashfunc
+    return hashlib.pbkdf2_hmac(hash_name, data, salt, iterations, keylen)
+
+
+def safe_str_cmp(a, b):
+    """This function compares strings in somewhat constant time.  This
+    requires that the length of at least one string is known in advance.
+
+    Returns `True` if the two strings are equal, or `False` if they are not.
+
+    .. versionadded:: 0.7
+    """
+    if isinstance(a, text_type):
+        a = a.encode("utf-8")
+    if isinstance(b, text_type):
+        b = b.encode("utf-8")
+
+    if _builtin_safe_str_cmp is not None:
+        return _builtin_safe_str_cmp(a, b)
+
+    if len(a) != len(b):
+        return False
+
+    rv = 0
+    if PY2:
+        for x, y in izip(a, b):
+            rv |= ord(x) ^ ord(y)
+    else:
+        for x, y in izip(a, b):
+            rv |= x ^ y
+
+    return rv == 0
+
+
+def gen_salt(length):
+    """Generate a random string of SALT_CHARS with specified ``length``."""
+    if length <= 0:
+        raise ValueError("Salt length must be positive")
+    return "".join(_sys_rng.choice(SALT_CHARS) for _ in range_type(length))
+
+
+def _hash_internal(method, salt, password):
+    """Internal password hash helper.  Supports plaintext without salt,
+    unsalted and salted passwords.  In case salted passwords are used
+    hmac is used.
+    """
+    if method == "plain":
+        return password, method
+
+    if isinstance(password, text_type):
+        password = password.encode("utf-8")
+
+    if method.startswith("pbkdf2:"):
+        args = method[7:].split(":")
+        if len(args) not in (1, 2):
+            raise ValueError("Invalid number of arguments for PBKDF2")
+        method = args.pop(0)
+        iterations = args and int(args[0] or 0) or DEFAULT_PBKDF2_ITERATIONS
+        is_pbkdf2 = True
+        actual_method = "pbkdf2:%s:%d" % (method, iterations)
+    else:
+        is_pbkdf2 = False
+        actual_method = method
+
+    if is_pbkdf2:
+        if not salt:
+            raise ValueError("Salt is required for PBKDF2")
+        rv = pbkdf2_hex(password, salt, iterations, hashfunc=method)
+    elif salt:
+        if isinstance(salt, text_type):
+            salt = salt.encode("utf-8")
+        mac = _create_mac(salt, password, method)
+        rv = mac.hexdigest()
+    else:
+        rv = hashlib.new(method, password).hexdigest()
+    return rv, actual_method
+
+
+def _create_mac(key, msg, method):
+    if callable(method):
+        return hmac.HMAC(key, msg, method)
+
+    def hashfunc(d=b""):
+        return hashlib.new(method, d)
+
+    # Python 2.7 used ``hasattr(digestmod, '__call__')``
+    # to detect if hashfunc is callable
+    hashfunc.__call__ = hashfunc
+    return hmac.HMAC(key, msg, hashfunc)
+
+
+def generate_password_hash(password, method="pbkdf2:sha256", salt_length=8):
+    """Hash a password with the given method and salt with a string of
+    the given length. The format of the string returned includes the method
+    that was used so that :func:`check_password_hash` can check the hash.
+
+    The format for the hashed string looks like this::
+
+        method$salt$hash
+
+    This method can **not** generate unsalted passwords but it is possible
+    to set param method='plain' in order to enforce plaintext passwords.
+    If a salt is used, hmac is used internally to salt the password.
+
+    If PBKDF2 is wanted it can be enabled by setting the method to
+    ``pbkdf2:method:iterations`` where iterations is optional::
+
+        pbkdf2:sha256:80000$salt$hash
+        pbkdf2:sha256$salt$hash
+
+    :param password: the password to hash.
+    :param method: the hash method to use (one that hashlib supports). Can
+                   optionally be in the format ``pbkdf2:[:iterations]``
+                   to enable PBKDF2.
+    :param salt_length: the length of the salt in letters.
+    """
+    salt = gen_salt(salt_length) if method != "plain" else ""
+    h, actual_method = _hash_internal(method, salt, password)
+    return "%s$%s$%s" % (actual_method, salt, h)
+
+
+def check_password_hash(pwhash, password):
+    """check a password against a given salted and hashed password value.
+    In order to support unsalted legacy passwords this method supports
+    plain text passwords, md5 and sha1 hashes (both salted and unsalted).
+
+    Returns `True` if the password matched, `False` otherwise.
+
+    :param pwhash: a hashed string like returned by
+                   :func:`generate_password_hash`.
+    :param password: the plaintext password to compare against the hash.
+    """
+    if pwhash.count("$") < 2:
+        return False
+    method, salt, hashval = pwhash.split("$", 2)
+    return safe_str_cmp(_hash_internal(method, salt, password)[0], hashval)
+
+
+def safe_join(directory, *pathnames):
+    """Safely join `directory` and one or more untrusted `pathnames`.  If this
+    cannot be done, this function returns ``None``.
+
+    :param directory: the base directory.
+    :param pathnames: the untrusted pathnames relative to that directory.
+    """
+    parts = [directory]
+    for filename in pathnames:
+        if filename != "":
+            filename = posixpath.normpath(filename)
+        for sep in _os_alt_seps:
+            if sep in filename:
+                return None
+        if os.path.isabs(filename) or filename == ".." or filename.startswith("../"):
+            return None
+        parts.append(filename)
+    return posixpath.join(*parts)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/serving.py b/venv/lib/python3.7/site-packages/werkzeug/serving.py
new file mode 100644
index 0000000..ff9f880
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/serving.py
@@ -0,0 +1,1074 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.serving
+    ~~~~~~~~~~~~~~~~
+
+    There are many ways to serve a WSGI application.  While you're developing
+    it you usually don't want a full blown webserver like Apache but a simple
+    standalone one.  From Python 2.5 onwards there is the `wsgiref`_ server in
+    the standard library.  If you're using older versions of Python you can
+    download the package from the cheeseshop.
+
+    However there are some caveats. Sourcecode won't reload itself when
+    changed and each time you kill the server using ``^C`` you get an
+    `KeyboardInterrupt` error.  While the latter is easy to solve the first
+    one can be a pain in the ass in some situations.
+
+    The easiest way is creating a small ``start-myproject.py`` that runs the
+    application::
+
+        #!/usr/bin/env python
+        # -*- coding: utf-8 -*-
+        from myproject import make_app
+        from werkzeug.serving import run_simple
+
+        app = make_app(...)
+        run_simple('localhost', 8080, app, use_reloader=True)
+
+    You can also pass it a `extra_files` keyword argument with a list of
+    additional files (like configuration files) you want to observe.
+
+    For bigger applications you should consider using `click`
+    (http://click.pocoo.org) instead of a simple start file.
+
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import io
+import os
+import signal
+import socket
+import sys
+
+import werkzeug
+from ._compat import PY2
+from ._compat import reraise
+from ._compat import WIN
+from ._compat import wsgi_encoding_dance
+from ._internal import _log
+from .exceptions import InternalServerError
+from .urls import uri_to_iri
+from .urls import url_parse
+from .urls import url_unquote
+
+try:
+    import socketserver
+    from http.server import BaseHTTPRequestHandler
+    from http.server import HTTPServer
+except ImportError:
+    import SocketServer as socketserver
+    from BaseHTTPServer import HTTPServer
+    from BaseHTTPServer import BaseHTTPRequestHandler
+
+try:
+    import ssl
+except ImportError:
+
+    class _SslDummy(object):
+        def __getattr__(self, name):
+            raise RuntimeError("SSL support unavailable")
+
+    ssl = _SslDummy()
+
+try:
+    import termcolor
+except ImportError:
+    termcolor = None
+
+
+def _get_openssl_crypto_module():
+    try:
+        from OpenSSL import crypto
+    except ImportError:
+        raise TypeError("Using ad-hoc certificates requires the pyOpenSSL library.")
+    else:
+        return crypto
+
+
+ThreadingMixIn = socketserver.ThreadingMixIn
+can_fork = hasattr(os, "fork")
+
+if can_fork:
+    ForkingMixIn = socketserver.ForkingMixIn
+else:
+
+    class ForkingMixIn(object):
+        pass
+
+
+try:
+    af_unix = socket.AF_UNIX
+except AttributeError:
+    af_unix = None
+
+
+LISTEN_QUEUE = 128
+can_open_by_fd = not WIN and hasattr(socket, "fromfd")
+
+# On Python 3, ConnectionError represents the same errnos as
+# socket.error from Python 2, while socket.error is an alias for the
+# more generic OSError.
+if PY2:
+    _ConnectionError = socket.error
+else:
+    _ConnectionError = ConnectionError
+
+
+class DechunkedInput(io.RawIOBase):
+    """An input stream that handles Transfer-Encoding 'chunked'"""
+
+    def __init__(self, rfile):
+        self._rfile = rfile
+        self._done = False
+        self._len = 0
+
+    def readable(self):
+        return True
+
+    def read_chunk_len(self):
+        try:
+            line = self._rfile.readline().decode("latin1")
+            _len = int(line.strip(), 16)
+        except ValueError:
+            raise IOError("Invalid chunk header")
+        if _len < 0:
+            raise IOError("Negative chunk length not allowed")
+        return _len
+
+    def readinto(self, buf):
+        read = 0
+        while not self._done and read < len(buf):
+            if self._len == 0:
+                # This is the first chunk or we fully consumed the previous
+                # one. Read the next length of the next chunk
+                self._len = self.read_chunk_len()
+
+            if self._len == 0:
+                # Found the final chunk of size 0. The stream is now exhausted,
+                # but there is still a final newline that should be consumed
+                self._done = True
+
+            if self._len > 0:
+                # There is data (left) in this chunk, so append it to the
+                # buffer. If this operation fully consumes the chunk, this will
+                # reset self._len to 0.
+                n = min(len(buf), self._len)
+                buf[read : read + n] = self._rfile.read(n)
+                self._len -= n
+                read += n
+
+            if self._len == 0:
+                # Skip the terminating newline of a chunk that has been fully
+                # consumed. This also applies to the 0-sized final chunk
+                terminator = self._rfile.readline()
+                if terminator not in (b"\n", b"\r\n", b"\r"):
+                    raise IOError("Missing chunk terminating newline")
+
+        return read
+
+
+class WSGIRequestHandler(BaseHTTPRequestHandler, object):
+
+    """A request handler that implements WSGI dispatching."""
+
+    @property
+    def server_version(self):
+        return "Werkzeug/" + werkzeug.__version__
+
+    def make_environ(self):
+        request_url = url_parse(self.path)
+
+        def shutdown_server():
+            self.server.shutdown_signal = True
+
+        url_scheme = "http" if self.server.ssl_context is None else "https"
+        if not self.client_address:
+            self.client_address = ""
+        if isinstance(self.client_address, str):
+            self.client_address = (self.client_address, 0)
+        else:
+            pass
+        path_info = url_unquote(request_url.path)
+
+        environ = {
+            "wsgi.version": (1, 0),
+            "wsgi.url_scheme": url_scheme,
+            "wsgi.input": self.rfile,
+            "wsgi.errors": sys.stderr,
+            "wsgi.multithread": self.server.multithread,
+            "wsgi.multiprocess": self.server.multiprocess,
+            "wsgi.run_once": False,
+            "werkzeug.server.shutdown": shutdown_server,
+            "SERVER_SOFTWARE": self.server_version,
+            "REQUEST_METHOD": self.command,
+            "SCRIPT_NAME": "",
+            "PATH_INFO": wsgi_encoding_dance(path_info),
+            "QUERY_STRING": wsgi_encoding_dance(request_url.query),
+            # Non-standard, added by mod_wsgi, uWSGI
+            "REQUEST_URI": wsgi_encoding_dance(self.path),
+            # Non-standard, added by gunicorn
+            "RAW_URI": wsgi_encoding_dance(self.path),
+            "REMOTE_ADDR": self.address_string(),
+            "REMOTE_PORT": self.port_integer(),
+            "SERVER_NAME": self.server.server_address[0],
+            "SERVER_PORT": str(self.server.server_address[1]),
+            "SERVER_PROTOCOL": self.request_version,
+        }
+
+        for key, value in self.get_header_items():
+            key = key.upper().replace("-", "_")
+            value = value.replace("\r\n", "")
+            if key not in ("CONTENT_TYPE", "CONTENT_LENGTH"):
+                key = "HTTP_" + key
+                if key in environ:
+                    value = "{},{}".format(environ[key], value)
+            environ[key] = value
+
+        if environ.get("HTTP_TRANSFER_ENCODING", "").strip().lower() == "chunked":
+            environ["wsgi.input_terminated"] = True
+            environ["wsgi.input"] = DechunkedInput(environ["wsgi.input"])
+
+        if request_url.scheme and request_url.netloc:
+            environ["HTTP_HOST"] = request_url.netloc
+
+        return environ
+
+    def run_wsgi(self):
+        if self.headers.get("Expect", "").lower().strip() == "100-continue":
+            self.wfile.write(b"HTTP/1.1 100 Continue\r\n\r\n")
+
+        self.environ = environ = self.make_environ()
+        headers_set = []
+        headers_sent = []
+
+        def write(data):
+            assert headers_set, "write() before start_response"
+            if not headers_sent:
+                status, response_headers = headers_sent[:] = headers_set
+                try:
+                    code, msg = status.split(None, 1)
+                except ValueError:
+                    code, msg = status, ""
+                code = int(code)
+                self.send_response(code, msg)
+                header_keys = set()
+                for key, value in response_headers:
+                    self.send_header(key, value)
+                    key = key.lower()
+                    header_keys.add(key)
+                if not (
+                    "content-length" in header_keys
+                    or environ["REQUEST_METHOD"] == "HEAD"
+                    or code < 200
+                    or code in (204, 304)
+                ):
+                    self.close_connection = True
+                    self.send_header("Connection", "close")
+                if "server" not in header_keys:
+                    self.send_header("Server", self.version_string())
+                if "date" not in header_keys:
+                    self.send_header("Date", self.date_time_string())
+                self.end_headers()
+
+            assert isinstance(data, bytes), "applications must write bytes"
+            self.wfile.write(data)
+            self.wfile.flush()
+
+        def start_response(status, response_headers, exc_info=None):
+            if exc_info:
+                try:
+                    if headers_sent:
+                        reraise(*exc_info)
+                finally:
+                    exc_info = None
+            elif headers_set:
+                raise AssertionError("Headers already set")
+            headers_set[:] = [status, response_headers]
+            return write
+
+        def execute(app):
+            application_iter = app(environ, start_response)
+            try:
+                for data in application_iter:
+                    write(data)
+                if not headers_sent:
+                    write(b"")
+            finally:
+                if hasattr(application_iter, "close"):
+                    application_iter.close()
+                application_iter = None
+
+        try:
+            execute(self.server.app)
+        except (_ConnectionError, socket.timeout) as e:
+            self.connection_dropped(e, environ)
+        except Exception:
+            if self.server.passthrough_errors:
+                raise
+            from .debug.tbtools import get_current_traceback
+
+            traceback = get_current_traceback(ignore_system_exceptions=True)
+            try:
+                # if we haven't yet sent the headers but they are set
+                # we roll back to be able to set them again.
+                if not headers_sent:
+                    del headers_set[:]
+                execute(InternalServerError())
+            except Exception:
+                pass
+            self.server.log("error", "Error on request:\n%s", traceback.plaintext)
+
+    def handle(self):
+        """Handles a request ignoring dropped connections."""
+        rv = None
+        try:
+            rv = BaseHTTPRequestHandler.handle(self)
+        except (_ConnectionError, socket.timeout) as e:
+            self.connection_dropped(e)
+        except Exception as e:
+            if self.server.ssl_context is None or not is_ssl_error(e):
+                raise
+        if self.server.shutdown_signal:
+            self.initiate_shutdown()
+        return rv
+
+    def initiate_shutdown(self):
+        """A horrible, horrible way to kill the server for Python 2.6 and
+        later.  It's the best we can do.
+        """
+        # Windows does not provide SIGKILL, go with SIGTERM then.
+        sig = getattr(signal, "SIGKILL", signal.SIGTERM)
+        # reloader active
+        if is_running_from_reloader():
+            os.kill(os.getpid(), sig)
+        # python 2.7
+        self.server._BaseServer__shutdown_request = True
+        # python 2.6
+        self.server._BaseServer__serving = False
+
+    def connection_dropped(self, error, environ=None):
+        """Called if the connection was closed by the client.  By default
+        nothing happens.
+        """
+
+    def handle_one_request(self):
+        """Handle a single HTTP request."""
+        self.raw_requestline = self.rfile.readline()
+        if not self.raw_requestline:
+            self.close_connection = 1
+        elif self.parse_request():
+            return self.run_wsgi()
+
+    def send_response(self, code, message=None):
+        """Send the response header and log the response code."""
+        self.log_request(code)
+        if message is None:
+            message = code in self.responses and self.responses[code][0] or ""
+        if self.request_version != "HTTP/0.9":
+            hdr = "%s %d %s\r\n" % (self.protocol_version, code, message)
+            self.wfile.write(hdr.encode("ascii"))
+
+    def version_string(self):
+        return BaseHTTPRequestHandler.version_string(self).strip()
+
+    def address_string(self):
+        if getattr(self, "environ", None):
+            return self.environ["REMOTE_ADDR"]
+        elif not self.client_address:
+            return ""
+        elif isinstance(self.client_address, str):
+            return self.client_address
+        else:
+            return self.client_address[0]
+
+    def port_integer(self):
+        return self.client_address[1]
+
+    def log_request(self, code="-", size="-"):
+        try:
+            path = uri_to_iri(self.path)
+            msg = "%s %s %s" % (self.command, path, self.request_version)
+        except AttributeError:
+            # path isn't set if the requestline was bad
+            msg = self.requestline
+
+        code = str(code)
+
+        if termcolor:
+            color = termcolor.colored
+
+            if code[0] == "1":  # 1xx - Informational
+                msg = color(msg, attrs=["bold"])
+            elif code[0] == "2":  # 2xx - Success
+                msg = color(msg, color="white")
+            elif code == "304":  # 304 - Resource Not Modified
+                msg = color(msg, color="cyan")
+            elif code[0] == "3":  # 3xx - Redirection
+                msg = color(msg, color="green")
+            elif code == "404":  # 404 - Resource Not Found
+                msg = color(msg, color="yellow")
+            elif code[0] == "4":  # 4xx - Client Error
+                msg = color(msg, color="red", attrs=["bold"])
+            else:  # 5xx, or any other response
+                msg = color(msg, color="magenta", attrs=["bold"])
+
+        self.log("info", '"%s" %s %s', msg, code, size)
+
+    def log_error(self, *args):
+        self.log("error", *args)
+
+    def log_message(self, format, *args):
+        self.log("info", format, *args)
+
+    def log(self, type, message, *args):
+        _log(
+            type,
+            "%s - - [%s] %s\n"
+            % (self.address_string(), self.log_date_time_string(), message % args),
+        )
+
+    def get_header_items(self):
+        """
+        Get an iterable list of key/value pairs representing headers.
+
+        This function provides Python 2/3 compatibility as related to the
+        parsing of request headers. Python 2.7 is not compliant with
+        RFC 3875 Section 4.1.18 which requires multiple values for headers
+        to be provided or RFC 2616 which allows for folding of multi-line
+        headers. This function will return a matching list regardless
+        of Python version. It can be removed once Python 2.7 support
+        is dropped.
+
+        :return: List of tuples containing header hey/value pairs
+        """
+        if PY2:
+            # For Python 2, process the headers manually according to
+            # W3C RFC 2616 Section 4.2.
+            items = []
+            for header in self.headers.headers:
+                # Remove "\r\n" from the header and split on ":" to get
+                # the field name and value.
+                try:
+                    key, value = header[0:-2].split(":", 1)
+                except ValueError:
+                    # If header could not be slit with : but starts with white
+                    # space and it follows an existing header, it's a folded
+                    # header.
+                    if header[0] in ("\t", " ") and items:
+                        # Pop off the last header
+                        key, value = items.pop()
+                        # Append the current header to the value of the last
+                        # header which will be placed back on the end of the
+                        # list
+                        value = value + header
+                    # Otherwise it's just a bad header and should error
+                    else:
+                        # Re-raise the value error
+                        raise
+
+                # Add the key and the value once stripped of leading
+                # white space. The specification allows for stripping
+                # trailing white space but the Python 3 code does not
+                # strip trailing white space. Therefore, trailing space
+                # will be left as is to match the Python 3 behavior.
+                items.append((key, value.lstrip()))
+        else:
+            items = self.headers.items()
+
+        return items
+
+
+#: backwards compatible name if someone is subclassing it
+BaseRequestHandler = WSGIRequestHandler
+
+
+def generate_adhoc_ssl_pair(cn=None):
+    from random import random
+
+    crypto = _get_openssl_crypto_module()
+
+    # pretty damn sure that this is not actually accepted by anyone
+    if cn is None:
+        cn = "*"
+
+    cert = crypto.X509()
+    cert.set_serial_number(int(random() * sys.maxsize))
+    cert.gmtime_adj_notBefore(0)
+    cert.gmtime_adj_notAfter(60 * 60 * 24 * 365)
+
+    subject = cert.get_subject()
+    subject.CN = cn
+    subject.O = "Dummy Certificate"  # noqa: E741
+
+    issuer = cert.get_issuer()
+    issuer.CN = subject.CN
+    issuer.O = subject.O  # noqa: E741
+
+    pkey = crypto.PKey()
+    pkey.generate_key(crypto.TYPE_RSA, 2048)
+    cert.set_pubkey(pkey)
+    cert.sign(pkey, "sha256")
+
+    return cert, pkey
+
+
+def make_ssl_devcert(base_path, host=None, cn=None):
+    """Creates an SSL key for development.  This should be used instead of
+    the ``'adhoc'`` key which generates a new cert on each server start.
+    It accepts a path for where it should store the key and cert and
+    either a host or CN.  If a host is given it will use the CN
+    ``*.host/CN=host``.
+
+    For more information see :func:`run_simple`.
+
+    .. versionadded:: 0.9
+
+    :param base_path: the path to the certificate and key.  The extension
+                      ``.crt`` is added for the certificate, ``.key`` is
+                      added for the key.
+    :param host: the name of the host.  This can be used as an alternative
+                 for the `cn`.
+    :param cn: the `CN` to use.
+    """
+    from OpenSSL import crypto
+
+    if host is not None:
+        cn = "*.%s/CN=%s" % (host, host)
+    cert, pkey = generate_adhoc_ssl_pair(cn=cn)
+
+    cert_file = base_path + ".crt"
+    pkey_file = base_path + ".key"
+
+    with open(cert_file, "wb") as f:
+        f.write(crypto.dump_certificate(crypto.FILETYPE_PEM, cert))
+    with open(pkey_file, "wb") as f:
+        f.write(crypto.dump_privatekey(crypto.FILETYPE_PEM, pkey))
+
+    return cert_file, pkey_file
+
+
+def generate_adhoc_ssl_context():
+    """Generates an adhoc SSL context for the development server."""
+    crypto = _get_openssl_crypto_module()
+    import tempfile
+    import atexit
+
+    cert, pkey = generate_adhoc_ssl_pair()
+    cert_handle, cert_file = tempfile.mkstemp()
+    pkey_handle, pkey_file = tempfile.mkstemp()
+    atexit.register(os.remove, pkey_file)
+    atexit.register(os.remove, cert_file)
+
+    os.write(cert_handle, crypto.dump_certificate(crypto.FILETYPE_PEM, cert))
+    os.write(pkey_handle, crypto.dump_privatekey(crypto.FILETYPE_PEM, pkey))
+    os.close(cert_handle)
+    os.close(pkey_handle)
+    ctx = load_ssl_context(cert_file, pkey_file)
+    return ctx
+
+
+def load_ssl_context(cert_file, pkey_file=None, protocol=None):
+    """Loads SSL context from cert/private key files and optional protocol.
+    Many parameters are directly taken from the API of
+    :py:class:`ssl.SSLContext`.
+
+    :param cert_file: Path of the certificate to use.
+    :param pkey_file: Path of the private key to use. If not given, the key
+                      will be obtained from the certificate file.
+    :param protocol: One of the ``PROTOCOL_*`` constants in the stdlib ``ssl``
+                     module. Defaults to ``PROTOCOL_SSLv23``.
+    """
+    if protocol is None:
+        protocol = ssl.PROTOCOL_SSLv23
+    ctx = _SSLContext(protocol)
+    ctx.load_cert_chain(cert_file, pkey_file)
+    return ctx
+
+
+class _SSLContext(object):
+
+    """A dummy class with a small subset of Python3's ``ssl.SSLContext``, only
+    intended to be used with and by Werkzeug."""
+
+    def __init__(self, protocol):
+        self._protocol = protocol
+        self._certfile = None
+        self._keyfile = None
+        self._password = None
+
+    def load_cert_chain(self, certfile, keyfile=None, password=None):
+        self._certfile = certfile
+        self._keyfile = keyfile or certfile
+        self._password = password
+
+    def wrap_socket(self, sock, **kwargs):
+        return ssl.wrap_socket(
+            sock,
+            keyfile=self._keyfile,
+            certfile=self._certfile,
+            ssl_version=self._protocol,
+            **kwargs
+        )
+
+
+def is_ssl_error(error=None):
+    """Checks if the given error (or the current one) is an SSL error."""
+    exc_types = (ssl.SSLError,)
+    try:
+        from OpenSSL.SSL import Error
+
+        exc_types += (Error,)
+    except ImportError:
+        pass
+
+    if error is None:
+        error = sys.exc_info()[1]
+    return isinstance(error, exc_types)
+
+
+def select_address_family(host, port):
+    """Return ``AF_INET4``, ``AF_INET6``, or ``AF_UNIX`` depending on
+    the host and port."""
+    # disabled due to problems with current ipv6 implementations
+    # and various operating systems.  Probably this code also is
+    # not supposed to work, but I can't come up with any other
+    # ways to implement this.
+    # try:
+    #     info = socket.getaddrinfo(host, port, socket.AF_UNSPEC,
+    #                               socket.SOCK_STREAM, 0,
+    #                               socket.AI_PASSIVE)
+    #     if info:
+    #         return info[0][0]
+    # except socket.gaierror:
+    #     pass
+    if host.startswith("unix://"):
+        return socket.AF_UNIX
+    elif ":" in host and hasattr(socket, "AF_INET6"):
+        return socket.AF_INET6
+    return socket.AF_INET
+
+
+def get_sockaddr(host, port, family):
+    """Return a fully qualified socket address that can be passed to
+    :func:`socket.bind`."""
+    if family == af_unix:
+        return host.split("://", 1)[1]
+    try:
+        res = socket.getaddrinfo(
+            host, port, family, socket.SOCK_STREAM, socket.IPPROTO_TCP
+        )
+    except socket.gaierror:
+        return host, port
+    return res[0][4]
+
+
+class BaseWSGIServer(HTTPServer, object):
+
+    """Simple single-threaded, single-process WSGI server."""
+
+    multithread = False
+    multiprocess = False
+    request_queue_size = LISTEN_QUEUE
+
+    def __init__(
+        self,
+        host,
+        port,
+        app,
+        handler=None,
+        passthrough_errors=False,
+        ssl_context=None,
+        fd=None,
+    ):
+        if handler is None:
+            handler = WSGIRequestHandler
+
+        self.address_family = select_address_family(host, port)
+
+        if fd is not None:
+            real_sock = socket.fromfd(fd, self.address_family, socket.SOCK_STREAM)
+            port = 0
+
+        server_address = get_sockaddr(host, int(port), self.address_family)
+
+        # remove socket file if it already exists
+        if self.address_family == af_unix and os.path.exists(server_address):
+            os.unlink(server_address)
+        HTTPServer.__init__(self, server_address, handler)
+
+        self.app = app
+        self.passthrough_errors = passthrough_errors
+        self.shutdown_signal = False
+        self.host = host
+        self.port = self.socket.getsockname()[1]
+
+        # Patch in the original socket.
+        if fd is not None:
+            self.socket.close()
+            self.socket = real_sock
+            self.server_address = self.socket.getsockname()
+
+        if ssl_context is not None:
+            if isinstance(ssl_context, tuple):
+                ssl_context = load_ssl_context(*ssl_context)
+            if ssl_context == "adhoc":
+                ssl_context = generate_adhoc_ssl_context()
+            # If we are on Python 2 the return value from socket.fromfd
+            # is an internal socket object but what we need for ssl wrap
+            # is the wrapper around it :(
+            sock = self.socket
+            if PY2 and not isinstance(sock, socket.socket):
+                sock = socket.socket(sock.family, sock.type, sock.proto, sock)
+            self.socket = ssl_context.wrap_socket(sock, server_side=True)
+            self.ssl_context = ssl_context
+        else:
+            self.ssl_context = None
+
+    def log(self, type, message, *args):
+        _log(type, message, *args)
+
+    def serve_forever(self):
+        self.shutdown_signal = False
+        try:
+            HTTPServer.serve_forever(self)
+        except KeyboardInterrupt:
+            pass
+        finally:
+            self.server_close()
+
+    def handle_error(self, request, client_address):
+        if self.passthrough_errors:
+            raise
+        # Python 2 still causes a socket.error after the earlier
+        # handling, so silence it here.
+        if isinstance(sys.exc_info()[1], _ConnectionError):
+            return
+        return HTTPServer.handle_error(self, request, client_address)
+
+    def get_request(self):
+        con, info = self.socket.accept()
+        return con, info
+
+
+class ThreadedWSGIServer(ThreadingMixIn, BaseWSGIServer):
+
+    """A WSGI server that does threading."""
+
+    multithread = True
+    daemon_threads = True
+
+
+class ForkingWSGIServer(ForkingMixIn, BaseWSGIServer):
+
+    """A WSGI server that does forking."""
+
+    multiprocess = True
+
+    def __init__(
+        self,
+        host,
+        port,
+        app,
+        processes=40,
+        handler=None,
+        passthrough_errors=False,
+        ssl_context=None,
+        fd=None,
+    ):
+        if not can_fork:
+            raise ValueError("Your platform does not support forking.")
+        BaseWSGIServer.__init__(
+            self, host, port, app, handler, passthrough_errors, ssl_context, fd
+        )
+        self.max_children = processes
+
+
+def make_server(
+    host=None,
+    port=None,
+    app=None,
+    threaded=False,
+    processes=1,
+    request_handler=None,
+    passthrough_errors=False,
+    ssl_context=None,
+    fd=None,
+):
+    """Create a new server instance that is either threaded, or forks
+    or just processes one request after another.
+    """
+    if threaded and processes > 1:
+        raise ValueError("cannot have a multithreaded and multi process server.")
+    elif threaded:
+        return ThreadedWSGIServer(
+            host, port, app, request_handler, passthrough_errors, ssl_context, fd=fd
+        )
+    elif processes > 1:
+        return ForkingWSGIServer(
+            host,
+            port,
+            app,
+            processes,
+            request_handler,
+            passthrough_errors,
+            ssl_context,
+            fd=fd,
+        )
+    else:
+        return BaseWSGIServer(
+            host, port, app, request_handler, passthrough_errors, ssl_context, fd=fd
+        )
+
+
+def is_running_from_reloader():
+    """Checks if the application is running from within the Werkzeug
+    reloader subprocess.
+
+    .. versionadded:: 0.10
+    """
+    return os.environ.get("WERKZEUG_RUN_MAIN") == "true"
+
+
+def run_simple(
+    hostname,
+    port,
+    application,
+    use_reloader=False,
+    use_debugger=False,
+    use_evalex=True,
+    extra_files=None,
+    reloader_interval=1,
+    reloader_type="auto",
+    threaded=False,
+    processes=1,
+    request_handler=None,
+    static_files=None,
+    passthrough_errors=False,
+    ssl_context=None,
+):
+    """Start a WSGI application. Optional features include a reloader,
+    multithreading and fork support.
+
+    This function has a command-line interface too::
+
+        python -m werkzeug.serving --help
+
+    .. versionadded:: 0.5
+       `static_files` was added to simplify serving of static files as well
+       as `passthrough_errors`.
+
+    .. versionadded:: 0.6
+       support for SSL was added.
+
+    .. versionadded:: 0.8
+       Added support for automatically loading a SSL context from certificate
+       file and private key.
+
+    .. versionadded:: 0.9
+       Added command-line interface.
+
+    .. versionadded:: 0.10
+       Improved the reloader and added support for changing the backend
+       through the `reloader_type` parameter.  See :ref:`reloader`
+       for more information.
+
+    .. versionchanged:: 0.15
+        Bind to a Unix socket by passing a path that starts with
+        ``unix://`` as the ``hostname``.
+
+    :param hostname: The host to bind to, for example ``'localhost'``.
+        If the value is a path that starts with ``unix://`` it will bind
+        to a Unix socket instead of a TCP socket..
+    :param port: The port for the server.  eg: ``8080``
+    :param application: the WSGI application to execute
+    :param use_reloader: should the server automatically restart the python
+                         process if modules were changed?
+    :param use_debugger: should the werkzeug debugging system be used?
+    :param use_evalex: should the exception evaluation feature be enabled?
+    :param extra_files: a list of files the reloader should watch
+                        additionally to the modules.  For example configuration
+                        files.
+    :param reloader_interval: the interval for the reloader in seconds.
+    :param reloader_type: the type of reloader to use.  The default is
+                          auto detection.  Valid values are ``'stat'`` and
+                          ``'watchdog'``. See :ref:`reloader` for more
+                          information.
+    :param threaded: should the process handle each request in a separate
+                     thread?
+    :param processes: if greater than 1 then handle each request in a new process
+                      up to this maximum number of concurrent processes.
+    :param request_handler: optional parameter that can be used to replace
+                            the default one.  You can use this to replace it
+                            with a different
+                            :class:`~BaseHTTPServer.BaseHTTPRequestHandler`
+                            subclass.
+    :param static_files: a list or dict of paths for static files.  This works
+                         exactly like :class:`SharedDataMiddleware`, it's actually
+                         just wrapping the application in that middleware before
+                         serving.
+    :param passthrough_errors: set this to `True` to disable the error catching.
+                               This means that the server will die on errors but
+                               it can be useful to hook debuggers in (pdb etc.)
+    :param ssl_context: an SSL context for the connection. Either an
+                        :class:`ssl.SSLContext`, a tuple in the form
+                        ``(cert_file, pkey_file)``, the string ``'adhoc'`` if
+                        the server should automatically create one, or ``None``
+                        to disable SSL (which is the default).
+    """
+    if not isinstance(port, int):
+        raise TypeError("port must be an integer")
+    if use_debugger:
+        from .debug import DebuggedApplication
+
+        application = DebuggedApplication(application, use_evalex)
+    if static_files:
+        from .middleware.shared_data import SharedDataMiddleware
+
+        application = SharedDataMiddleware(application, static_files)
+
+    def log_startup(sock):
+        display_hostname = hostname if hostname not in ("", "*") else "localhost"
+        quit_msg = "(Press CTRL+C to quit)"
+        if sock.family == af_unix:
+            _log("info", " * Running on %s %s", display_hostname, quit_msg)
+        else:
+            if ":" in display_hostname:
+                display_hostname = "[%s]" % display_hostname
+            port = sock.getsockname()[1]
+            _log(
+                "info",
+                " * Running on %s://%s:%d/ %s",
+                "http" if ssl_context is None else "https",
+                display_hostname,
+                port,
+                quit_msg,
+            )
+
+    def inner():
+        try:
+            fd = int(os.environ["WERKZEUG_SERVER_FD"])
+        except (LookupError, ValueError):
+            fd = None
+        srv = make_server(
+            hostname,
+            port,
+            application,
+            threaded,
+            processes,
+            request_handler,
+            passthrough_errors,
+            ssl_context,
+            fd=fd,
+        )
+        if fd is None:
+            log_startup(srv.socket)
+        srv.serve_forever()
+
+    if use_reloader:
+        # If we're not running already in the subprocess that is the
+        # reloader we want to open up a socket early to make sure the
+        # port is actually available.
+        if not is_running_from_reloader():
+            if port == 0 and not can_open_by_fd:
+                raise ValueError(
+                    "Cannot bind to a random port with enabled "
+                    "reloader if the Python interpreter does "
+                    "not support socket opening by fd."
+                )
+
+            # Create and destroy a socket so that any exceptions are
+            # raised before we spawn a separate Python interpreter and
+            # lose this ability.
+            address_family = select_address_family(hostname, port)
+            server_address = get_sockaddr(hostname, port, address_family)
+            s = socket.socket(address_family, socket.SOCK_STREAM)
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            s.bind(server_address)
+            if hasattr(s, "set_inheritable"):
+                s.set_inheritable(True)
+
+            # If we can open the socket by file descriptor, then we can just
+            # reuse this one and our socket will survive the restarts.
+            if can_open_by_fd:
+                os.environ["WERKZEUG_SERVER_FD"] = str(s.fileno())
+                s.listen(LISTEN_QUEUE)
+                log_startup(s)
+            else:
+                s.close()
+                if address_family == af_unix:
+                    _log("info", "Unlinking %s" % server_address)
+                    os.unlink(server_address)
+
+        # Do not use relative imports, otherwise "python -m werkzeug.serving"
+        # breaks.
+        from ._reloader import run_with_reloader
+
+        run_with_reloader(inner, extra_files, reloader_interval, reloader_type)
+    else:
+        inner()
+
+
+def run_with_reloader(*args, **kwargs):
+    # People keep using undocumented APIs.  Do not use this function
+    # please, we do not guarantee that it continues working.
+    from ._reloader import run_with_reloader
+
+    return run_with_reloader(*args, **kwargs)
+
+
+def main():
+    """A simple command-line interface for :py:func:`run_simple`."""
+
+    # in contrast to argparse, this works at least under Python < 2.7
+    import optparse
+    from .utils import import_string
+
+    parser = optparse.OptionParser(usage="Usage: %prog [options] app_module:app_object")
+    parser.add_option(
+        "-b",
+        "--bind",
+        dest="address",
+        help="The hostname:port the app should listen on.",
+    )
+    parser.add_option(
+        "-d",
+        "--debug",
+        dest="use_debugger",
+        action="store_true",
+        default=False,
+        help="Use Werkzeug's debugger.",
+    )
+    parser.add_option(
+        "-r",
+        "--reload",
+        dest="use_reloader",
+        action="store_true",
+        default=False,
+        help="Reload Python process if modules change.",
+    )
+    options, args = parser.parse_args()
+
+    hostname, port = None, None
+    if options.address:
+        address = options.address.split(":")
+        hostname = address[0]
+        if len(address) > 1:
+            port = address[1]
+
+    if len(args) != 1:
+        sys.stdout.write("No application supplied, or too much. See --help\n")
+        sys.exit(1)
+    app = import_string(args[0])
+
+    run_simple(
+        hostname=(hostname or "127.0.0.1"),
+        port=int(port or 5000),
+        application=app,
+        use_reloader=options.use_reloader,
+        use_debugger=options.use_debugger,
+    )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/venv/lib/python3.7/site-packages/werkzeug/test.py b/venv/lib/python3.7/site-packages/werkzeug/test.py
new file mode 100644
index 0000000..6148665
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/test.py
@@ -0,0 +1,1146 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.test
+    ~~~~~~~~~~~~~
+
+    This module implements a client to WSGI applications for testing.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import mimetypes
+import sys
+from io import BytesIO
+from itertools import chain
+from random import random
+from tempfile import TemporaryFile
+from time import time
+
+from ._compat import iteritems
+from ._compat import iterlists
+from ._compat import itervalues
+from ._compat import make_literal_wrapper
+from ._compat import reraise
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import to_bytes
+from ._compat import wsgi_encoding_dance
+from ._internal import _get_environ
+from .datastructures import CallbackDict
+from .datastructures import CombinedMultiDict
+from .datastructures import EnvironHeaders
+from .datastructures import FileMultiDict
+from .datastructures import FileStorage
+from .datastructures import Headers
+from .datastructures import MultiDict
+from .http import dump_cookie
+from .http import dump_options_header
+from .http import parse_options_header
+from .urls import iri_to_uri
+from .urls import url_encode
+from .urls import url_fix
+from .urls import url_parse
+from .urls import url_unparse
+from .urls import url_unquote
+from .utils import get_content_type
+from .wrappers import BaseRequest
+from .wsgi import ClosingIterator
+from .wsgi import get_current_url
+
+try:
+    from urllib.request import Request as U2Request
+except ImportError:
+    from urllib2 import Request as U2Request
+
+try:
+    from http.cookiejar import CookieJar
+except ImportError:
+    from cookielib import CookieJar
+
+
+def stream_encode_multipart(
+    values, use_tempfile=True, threshold=1024 * 500, boundary=None, charset="utf-8"
+):
+    """Encode a dict of values (either strings or file descriptors or
+    :class:`FileStorage` objects.) into a multipart encoded string stored
+    in a file descriptor.
+    """
+    if boundary is None:
+        boundary = "---------------WerkzeugFormPart_%s%s" % (time(), random())
+    _closure = [BytesIO(), 0, False]
+
+    if use_tempfile:
+
+        def write_binary(string):
+            stream, total_length, on_disk = _closure
+            if on_disk:
+                stream.write(string)
+            else:
+                length = len(string)
+                if length + _closure[1] <= threshold:
+                    stream.write(string)
+                else:
+                    new_stream = TemporaryFile("wb+")
+                    new_stream.write(stream.getvalue())
+                    new_stream.write(string)
+                    _closure[0] = new_stream
+                    _closure[2] = True
+                _closure[1] = total_length + length
+
+    else:
+        write_binary = _closure[0].write
+
+    def write(string):
+        write_binary(string.encode(charset))
+
+    if not isinstance(values, MultiDict):
+        values = MultiDict(values)
+
+    for key, values in iterlists(values):
+        for value in values:
+            write('--%s\r\nContent-Disposition: form-data; name="%s"' % (boundary, key))
+            reader = getattr(value, "read", None)
+            if reader is not None:
+                filename = getattr(value, "filename", getattr(value, "name", None))
+                content_type = getattr(value, "content_type", None)
+                if content_type is None:
+                    content_type = (
+                        filename
+                        and mimetypes.guess_type(filename)[0]
+                        or "application/octet-stream"
+                    )
+                if filename is not None:
+                    write('; filename="%s"\r\n' % filename)
+                else:
+                    write("\r\n")
+                write("Content-Type: %s\r\n\r\n" % content_type)
+                while 1:
+                    chunk = reader(16384)
+                    if not chunk:
+                        break
+                    write_binary(chunk)
+            else:
+                if not isinstance(value, string_types):
+                    value = str(value)
+
+                value = to_bytes(value, charset)
+                write("\r\n\r\n")
+                write_binary(value)
+            write("\r\n")
+    write("--%s--\r\n" % boundary)
+
+    length = int(_closure[0].tell())
+    _closure[0].seek(0)
+    return _closure[0], length, boundary
+
+
+def encode_multipart(values, boundary=None, charset="utf-8"):
+    """Like `stream_encode_multipart` but returns a tuple in the form
+    (``boundary``, ``data``) where data is a bytestring.
+    """
+    stream, length, boundary = stream_encode_multipart(
+        values, use_tempfile=False, boundary=boundary, charset=charset
+    )
+    return boundary, stream.read()
+
+
+def File(fd, filename=None, mimetype=None):
+    """Backwards compat.
+
+    .. deprecated:: 0.5
+    """
+    from warnings import warn
+
+    warn(
+        "'werkzeug.test.File' is deprecated as of version 0.5 and will"
+        " be removed in version 1.0. Use 'EnvironBuilder' or"
+        " 'FileStorage' instead.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
+    return FileStorage(fd, filename=filename, content_type=mimetype)
+
+
+class _TestCookieHeaders(object):
+
+    """A headers adapter for cookielib
+    """
+
+    def __init__(self, headers):
+        self.headers = headers
+
+    def getheaders(self, name):
+        headers = []
+        name = name.lower()
+        for k, v in self.headers:
+            if k.lower() == name:
+                headers.append(v)
+        return headers
+
+    def get_all(self, name, default=None):
+        rv = []
+        for k, v in self.headers:
+            if k.lower() == name.lower():
+                rv.append(v)
+        return rv or default or []
+
+
+class _TestCookieResponse(object):
+
+    """Something that looks like a httplib.HTTPResponse, but is actually just an
+    adapter for our test responses to make them available for cookielib.
+    """
+
+    def __init__(self, headers):
+        self.headers = _TestCookieHeaders(headers)
+
+    def info(self):
+        return self.headers
+
+
+class _TestCookieJar(CookieJar):
+
+    """A cookielib.CookieJar modified to inject and read cookie headers from
+    and to wsgi environments, and wsgi application responses.
+    """
+
+    def inject_wsgi(self, environ):
+        """Inject the cookies as client headers into the server's wsgi
+        environment.
+        """
+        cvals = ["%s=%s" % (c.name, c.value) for c in self]
+
+        if cvals:
+            environ["HTTP_COOKIE"] = "; ".join(cvals)
+        else:
+            environ.pop("HTTP_COOKIE", None)
+
+    def extract_wsgi(self, environ, headers):
+        """Extract the server's set-cookie headers as cookies into the
+        cookie jar.
+        """
+        self.extract_cookies(
+            _TestCookieResponse(headers), U2Request(get_current_url(environ))
+        )
+
+
+def _iter_data(data):
+    """Iterates over a `dict` or :class:`MultiDict` yielding all keys and
+    values.
+    This is used to iterate over the data passed to the
+    :class:`EnvironBuilder`.
+    """
+    if isinstance(data, MultiDict):
+        for key, values in iterlists(data):
+            for value in values:
+                yield key, value
+    else:
+        for key, values in iteritems(data):
+            if isinstance(values, list):
+                for value in values:
+                    yield key, value
+            else:
+                yield key, values
+
+
+class EnvironBuilder(object):
+    """This class can be used to conveniently create a WSGI environment
+    for testing purposes.  It can be used to quickly create WSGI environments
+    or request objects from arbitrary data.
+
+    The signature of this class is also used in some other places as of
+    Werkzeug 0.5 (:func:`create_environ`, :meth:`BaseResponse.from_values`,
+    :meth:`Client.open`).  Because of this most of the functionality is
+    available through the constructor alone.
+
+    Files and regular form data can be manipulated independently of each
+    other with the :attr:`form` and :attr:`files` attributes, but are
+    passed with the same argument to the constructor: `data`.
+
+    `data` can be any of these values:
+
+    -   a `str` or `bytes` object: The object is converted into an
+        :attr:`input_stream`, the :attr:`content_length` is set and you have to
+        provide a :attr:`content_type`.
+    -   a `dict` or :class:`MultiDict`: The keys have to be strings. The values
+        have to be either any of the following objects, or a list of any of the
+        following objects:
+
+        -   a :class:`file`-like object:  These are converted into
+            :class:`FileStorage` objects automatically.
+        -   a `tuple`:  The :meth:`~FileMultiDict.add_file` method is called
+            with the key and the unpacked `tuple` items as positional
+            arguments.
+        -   a `str`:  The string is set as form data for the associated key.
+    -   a file-like object: The object content is loaded in memory and then
+        handled like a regular `str` or a `bytes`.
+
+    :param path: the path of the request.  In the WSGI environment this will
+                 end up as `PATH_INFO`.  If the `query_string` is not defined
+                 and there is a question mark in the `path` everything after
+                 it is used as query string.
+    :param base_url: the base URL is a URL that is used to extract the WSGI
+                     URL scheme, host (server name + server port) and the
+                     script root (`SCRIPT_NAME`).
+    :param query_string: an optional string or dict with URL parameters.
+    :param method: the HTTP method to use, defaults to `GET`.
+    :param input_stream: an optional input stream.  Do not specify this and
+                         `data`.  As soon as an input stream is set you can't
+                         modify :attr:`args` and :attr:`files` unless you
+                         set the :attr:`input_stream` to `None` again.
+    :param content_type: The content type for the request.  As of 0.5 you
+                         don't have to provide this when specifying files
+                         and form data via `data`.
+    :param content_length: The content length for the request.  You don't
+                           have to specify this when providing data via
+                           `data`.
+    :param errors_stream: an optional error stream that is used for
+                          `wsgi.errors`.  Defaults to :data:`stderr`.
+    :param multithread: controls `wsgi.multithread`.  Defaults to `False`.
+    :param multiprocess: controls `wsgi.multiprocess`.  Defaults to `False`.
+    :param run_once: controls `wsgi.run_once`.  Defaults to `False`.
+    :param headers: an optional list or :class:`Headers` object of headers.
+    :param data: a string or dict of form data or a file-object.
+                 See explanation above.
+    :param json: An object to be serialized and assigned to ``data``.
+        Defaults the content type to ``"application/json"``.
+        Serialized with the function assigned to :attr:`json_dumps`.
+    :param environ_base: an optional dict of environment defaults.
+    :param environ_overrides: an optional dict of environment overrides.
+    :param charset: the charset used to encode unicode data.
+
+    .. versionadded:: 0.15
+        The ``json`` param and :meth:`json_dumps` method.
+
+    .. versionadded:: 0.15
+        The environ has keys ``REQUEST_URI`` and ``RAW_URI`` containing
+        the path before perecent-decoding. This is not part of the WSGI
+        PEP, but many WSGI servers include it.
+
+    .. versionchanged:: 0.6
+       ``path`` and ``base_url`` can now be unicode strings that are
+       encoded with :func:`iri_to_uri`.
+    """
+
+    #: the server protocol to use.  defaults to HTTP/1.1
+    server_protocol = "HTTP/1.1"
+
+    #: the wsgi version to use.  defaults to (1, 0)
+    wsgi_version = (1, 0)
+
+    #: the default request class for :meth:`get_request`
+    request_class = BaseRequest
+
+    import json
+
+    #: The serialization function used when ``json`` is passed.
+    json_dumps = staticmethod(json.dumps)
+    del json
+
+    def __init__(
+        self,
+        path="/",
+        base_url=None,
+        query_string=None,
+        method="GET",
+        input_stream=None,
+        content_type=None,
+        content_length=None,
+        errors_stream=None,
+        multithread=False,
+        multiprocess=False,
+        run_once=False,
+        headers=None,
+        data=None,
+        environ_base=None,
+        environ_overrides=None,
+        charset="utf-8",
+        mimetype=None,
+        json=None,
+    ):
+        path_s = make_literal_wrapper(path)
+        if query_string is not None and path_s("?") in path:
+            raise ValueError("Query string is defined in the path and as an argument")
+        if query_string is None and path_s("?") in path:
+            path, query_string = path.split(path_s("?"), 1)
+        self.charset = charset
+        self.path = iri_to_uri(path)
+        if base_url is not None:
+            base_url = url_fix(iri_to_uri(base_url, charset), charset)
+        self.base_url = base_url
+        if isinstance(query_string, (bytes, text_type)):
+            self.query_string = query_string
+        else:
+            if query_string is None:
+                query_string = MultiDict()
+            elif not isinstance(query_string, MultiDict):
+                query_string = MultiDict(query_string)
+            self.args = query_string
+        self.method = method
+        if headers is None:
+            headers = Headers()
+        elif not isinstance(headers, Headers):
+            headers = Headers(headers)
+        self.headers = headers
+        if content_type is not None:
+            self.content_type = content_type
+        if errors_stream is None:
+            errors_stream = sys.stderr
+        self.errors_stream = errors_stream
+        self.multithread = multithread
+        self.multiprocess = multiprocess
+        self.run_once = run_once
+        self.environ_base = environ_base
+        self.environ_overrides = environ_overrides
+        self.input_stream = input_stream
+        self.content_length = content_length
+        self.closed = False
+
+        if json is not None:
+            if data is not None:
+                raise TypeError("can't provide both json and data")
+
+            data = self.json_dumps(json)
+
+            if self.content_type is None:
+                self.content_type = "application/json"
+
+        if data:
+            if input_stream is not None:
+                raise TypeError("can't provide input stream and data")
+            if hasattr(data, "read"):
+                data = data.read()
+            if isinstance(data, text_type):
+                data = data.encode(self.charset)
+            if isinstance(data, bytes):
+                self.input_stream = BytesIO(data)
+                if self.content_length is None:
+                    self.content_length = len(data)
+            else:
+                for key, value in _iter_data(data):
+                    if isinstance(value, (tuple, dict)) or hasattr(value, "read"):
+                        self._add_file_from_data(key, value)
+                    else:
+                        self.form.setlistdefault(key).append(value)
+
+        if mimetype is not None:
+            self.mimetype = mimetype
+
+    @classmethod
+    def from_environ(cls, environ, **kwargs):
+        """Turn an environ dict back into a builder. Any extra kwargs
+        override the args extracted from the environ.
+
+        .. versionadded:: 0.15
+        """
+        headers = Headers(EnvironHeaders(environ))
+        out = {
+            "path": environ["PATH_INFO"],
+            "base_url": cls._make_base_url(
+                environ["wsgi.url_scheme"], headers.pop("Host"), environ["SCRIPT_NAME"]
+            ),
+            "query_string": environ["QUERY_STRING"],
+            "method": environ["REQUEST_METHOD"],
+            "input_stream": environ["wsgi.input"],
+            "content_type": headers.pop("Content-Type", None),
+            "content_length": headers.pop("Content-Length", None),
+            "errors_stream": environ["wsgi.errors"],
+            "multithread": environ["wsgi.multithread"],
+            "multiprocess": environ["wsgi.multiprocess"],
+            "run_once": environ["wsgi.run_once"],
+            "headers": headers,
+        }
+        out.update(kwargs)
+        return cls(**out)
+
+    def _add_file_from_data(self, key, value):
+        """Called in the EnvironBuilder to add files from the data dict."""
+        if isinstance(value, tuple):
+            self.files.add_file(key, *value)
+        elif isinstance(value, dict):
+            from warnings import warn
+
+            warn(
+                "Passing a dict as file data is deprecated as of"
+                " version 0.5 and will be removed in version 1.0. Use"
+                " a tuple or 'FileStorage' object instead.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+            value = dict(value)
+            mimetype = value.pop("mimetype", None)
+            if mimetype is not None:
+                value["content_type"] = mimetype
+            self.files.add_file(key, **value)
+        else:
+            self.files.add_file(key, value)
+
+    @staticmethod
+    def _make_base_url(scheme, host, script_root):
+        return url_unparse((scheme, host, script_root, "", "")).rstrip("/") + "/"
+
+    @property
+    def base_url(self):
+        """The base URL is used to extract the URL scheme, host name,
+        port, and root path.
+        """
+        return self._make_base_url(self.url_scheme, self.host, self.script_root)
+
+    @base_url.setter
+    def base_url(self, value):
+        if value is None:
+            scheme = "http"
+            netloc = "localhost"
+            script_root = ""
+        else:
+            scheme, netloc, script_root, qs, anchor = url_parse(value)
+            if qs or anchor:
+                raise ValueError("base url must not contain a query string or fragment")
+        self.script_root = script_root.rstrip("/")
+        self.host = netloc
+        self.url_scheme = scheme
+
+    def _get_content_type(self):
+        ct = self.headers.get("Content-Type")
+        if ct is None and not self._input_stream:
+            if self._files:
+                return "multipart/form-data"
+            elif self._form:
+                return "application/x-www-form-urlencoded"
+            return None
+        return ct
+
+    def _set_content_type(self, value):
+        if value is None:
+            self.headers.pop("Content-Type", None)
+        else:
+            self.headers["Content-Type"] = value
+
+    content_type = property(
+        _get_content_type,
+        _set_content_type,
+        doc="""The content type for the request.  Reflected from and to
+        the :attr:`headers`.  Do not set if you set :attr:`files` or
+        :attr:`form` for auto detection.""",
+    )
+    del _get_content_type, _set_content_type
+
+    def _get_content_length(self):
+        return self.headers.get("Content-Length", type=int)
+
+    def _get_mimetype(self):
+        ct = self.content_type
+        if ct:
+            return ct.split(";")[0].strip()
+
+    def _set_mimetype(self, value):
+        self.content_type = get_content_type(value, self.charset)
+
+    def _get_mimetype_params(self):
+        def on_update(d):
+            self.headers["Content-Type"] = dump_options_header(self.mimetype, d)
+
+        d = parse_options_header(self.headers.get("content-type", ""))[1]
+        return CallbackDict(d, on_update)
+
+    mimetype = property(
+        _get_mimetype,
+        _set_mimetype,
+        doc="""The mimetype (content type without charset etc.)
+
+        .. versionadded:: 0.14
+    """,
+    )
+    mimetype_params = property(
+        _get_mimetype_params,
+        doc=""" The mimetype parameters as dict.  For example if the
+        content type is ``text/html; charset=utf-8`` the params would be
+        ``{'charset': 'utf-8'}``.
+
+        .. versionadded:: 0.14
+        """,
+    )
+    del _get_mimetype, _set_mimetype, _get_mimetype_params
+
+    def _set_content_length(self, value):
+        if value is None:
+            self.headers.pop("Content-Length", None)
+        else:
+            self.headers["Content-Length"] = str(value)
+
+    content_length = property(
+        _get_content_length,
+        _set_content_length,
+        doc="""The content length as integer.  Reflected from and to the
+        :attr:`headers`.  Do not set if you set :attr:`files` or
+        :attr:`form` for auto detection.""",
+    )
+    del _get_content_length, _set_content_length
+
+    def form_property(name, storage, doc):  # noqa: B902
+        key = "_" + name
+
+        def getter(self):
+            if self._input_stream is not None:
+                raise AttributeError("an input stream is defined")
+            rv = getattr(self, key)
+            if rv is None:
+                rv = storage()
+                setattr(self, key, rv)
+
+            return rv
+
+        def setter(self, value):
+            self._input_stream = None
+            setattr(self, key, value)
+
+        return property(getter, setter, doc=doc)
+
+    form = form_property("form", MultiDict, doc="A :class:`MultiDict` of form values.")
+    files = form_property(
+        "files",
+        FileMultiDict,
+        doc="""A :class:`FileMultiDict` of uploaded files.  You can use
+        the :meth:`~FileMultiDict.add_file` method to add new files to
+        the dict.""",
+    )
+    del form_property
+
+    def _get_input_stream(self):
+        return self._input_stream
+
+    def _set_input_stream(self, value):
+        self._input_stream = value
+        self._form = self._files = None
+
+    input_stream = property(
+        _get_input_stream,
+        _set_input_stream,
+        doc="""An optional input stream.  If you set this it will clear
+        :attr:`form` and :attr:`files`.""",
+    )
+    del _get_input_stream, _set_input_stream
+
+    def _get_query_string(self):
+        if self._query_string is None:
+            if self._args is not None:
+                return url_encode(self._args, charset=self.charset)
+            return ""
+        return self._query_string
+
+    def _set_query_string(self, value):
+        self._query_string = value
+        self._args = None
+
+    query_string = property(
+        _get_query_string,
+        _set_query_string,
+        doc="""The query string.  If you set this to a string
+        :attr:`args` will no longer be available.""",
+    )
+    del _get_query_string, _set_query_string
+
+    def _get_args(self):
+        if self._query_string is not None:
+            raise AttributeError("a query string is defined")
+        if self._args is None:
+            self._args = MultiDict()
+        return self._args
+
+    def _set_args(self, value):
+        self._query_string = None
+        self._args = value
+
+    args = property(
+        _get_args, _set_args, doc="The URL arguments as :class:`MultiDict`."
+    )
+    del _get_args, _set_args
+
+    @property
+    def server_name(self):
+        """The server name (read-only, use :attr:`host` to set)"""
+        return self.host.split(":", 1)[0]
+
+    @property
+    def server_port(self):
+        """The server port as integer (read-only, use :attr:`host` to set)"""
+        pieces = self.host.split(":", 1)
+        if len(pieces) == 2 and pieces[1].isdigit():
+            return int(pieces[1])
+        elif self.url_scheme == "https":
+            return 443
+        return 80
+
+    def __del__(self):
+        try:
+            self.close()
+        except Exception:
+            pass
+
+    def close(self):
+        """Closes all files.  If you put real :class:`file` objects into the
+        :attr:`files` dict you can call this method to automatically close
+        them all in one go.
+        """
+        if self.closed:
+            return
+        try:
+            files = itervalues(self.files)
+        except AttributeError:
+            files = ()
+        for f in files:
+            try:
+                f.close()
+            except Exception:
+                pass
+        self.closed = True
+
+    def get_environ(self):
+        """Return the built environ.
+
+        .. versionchanged:: 0.15
+            The content type and length headers are set based on
+            input stream detection. Previously this only set the WSGI
+            keys.
+        """
+        input_stream = self.input_stream
+        content_length = self.content_length
+
+        mimetype = self.mimetype
+        content_type = self.content_type
+
+        if input_stream is not None:
+            start_pos = input_stream.tell()
+            input_stream.seek(0, 2)
+            end_pos = input_stream.tell()
+            input_stream.seek(start_pos)
+            content_length = end_pos - start_pos
+        elif mimetype == "multipart/form-data":
+            values = CombinedMultiDict([self.form, self.files])
+            input_stream, content_length, boundary = stream_encode_multipart(
+                values, charset=self.charset
+            )
+            content_type = mimetype + '; boundary="%s"' % boundary
+        elif mimetype == "application/x-www-form-urlencoded":
+            # XXX: py2v3 review
+            values = url_encode(self.form, charset=self.charset)
+            values = values.encode("ascii")
+            content_length = len(values)
+            input_stream = BytesIO(values)
+        else:
+            input_stream = BytesIO()
+
+        result = {}
+        if self.environ_base:
+            result.update(self.environ_base)
+
+        def _path_encode(x):
+            return wsgi_encoding_dance(url_unquote(x, self.charset), self.charset)
+
+        qs = wsgi_encoding_dance(self.query_string)
+
+        result.update(
+            {
+                "REQUEST_METHOD": self.method,
+                "SCRIPT_NAME": _path_encode(self.script_root),
+                "PATH_INFO": _path_encode(self.path),
+                "QUERY_STRING": qs,
+                # Non-standard, added by mod_wsgi, uWSGI
+                "REQUEST_URI": wsgi_encoding_dance(self.path),
+                # Non-standard, added by gunicorn
+                "RAW_URI": wsgi_encoding_dance(self.path),
+                "SERVER_NAME": self.server_name,
+                "SERVER_PORT": str(self.server_port),
+                "HTTP_HOST": self.host,
+                "SERVER_PROTOCOL": self.server_protocol,
+                "wsgi.version": self.wsgi_version,
+                "wsgi.url_scheme": self.url_scheme,
+                "wsgi.input": input_stream,
+                "wsgi.errors": self.errors_stream,
+                "wsgi.multithread": self.multithread,
+                "wsgi.multiprocess": self.multiprocess,
+                "wsgi.run_once": self.run_once,
+            }
+        )
+
+        headers = self.headers.copy()
+
+        if content_type is not None:
+            result["CONTENT_TYPE"] = content_type
+            headers.set("Content-Type", content_type)
+
+        if content_length is not None:
+            result["CONTENT_LENGTH"] = str(content_length)
+            headers.set("Content-Length", content_length)
+
+        for key, value in headers.to_wsgi_list():
+            result["HTTP_%s" % key.upper().replace("-", "_")] = value
+
+        if self.environ_overrides:
+            result.update(self.environ_overrides)
+
+        return result
+
+    def get_request(self, cls=None):
+        """Returns a request with the data.  If the request class is not
+        specified :attr:`request_class` is used.
+
+        :param cls: The request wrapper to use.
+        """
+        if cls is None:
+            cls = self.request_class
+        return cls(self.get_environ())
+
+
+class ClientRedirectError(Exception):
+    """If a redirect loop is detected when using follow_redirects=True with
+    the :cls:`Client`, then this exception is raised.
+    """
+
+
+class Client(object):
+    """This class allows you to send requests to a wrapped application.
+
+    The response wrapper can be a class or factory function that takes
+    three arguments: app_iter, status and headers.  The default response
+    wrapper just returns a tuple.
+
+    Example::
+
+        class ClientResponse(BaseResponse):
+            ...
+
+        client = Client(MyApplication(), response_wrapper=ClientResponse)
+
+    The use_cookies parameter indicates whether cookies should be stored and
+    sent for subsequent requests. This is True by default, but passing False
+    will disable this behaviour.
+
+    If you want to request some subdomain of your application you may set
+    `allow_subdomain_redirects` to `True` as if not no external redirects
+    are allowed.
+
+    .. versionadded:: 0.5
+       `use_cookies` is new in this version.  Older versions did not provide
+       builtin cookie support.
+
+    .. versionadded:: 0.14
+       The `mimetype` parameter was added.
+
+    .. versionadded:: 0.15
+        The ``json`` parameter.
+    """
+
+    def __init__(
+        self,
+        application,
+        response_wrapper=None,
+        use_cookies=True,
+        allow_subdomain_redirects=False,
+    ):
+        self.application = application
+        self.response_wrapper = response_wrapper
+        if use_cookies:
+            self.cookie_jar = _TestCookieJar()
+        else:
+            self.cookie_jar = None
+        self.allow_subdomain_redirects = allow_subdomain_redirects
+
+    def set_cookie(
+        self,
+        server_name,
+        key,
+        value="",
+        max_age=None,
+        expires=None,
+        path="/",
+        domain=None,
+        secure=None,
+        httponly=False,
+        charset="utf-8",
+    ):
+        """Sets a cookie in the client's cookie jar.  The server name
+        is required and has to match the one that is also passed to
+        the open call.
+        """
+        assert self.cookie_jar is not None, "cookies disabled"
+        header = dump_cookie(
+            key, value, max_age, expires, path, domain, secure, httponly, charset
+        )
+        environ = create_environ(path, base_url="http://" + server_name)
+        headers = [("Set-Cookie", header)]
+        self.cookie_jar.extract_wsgi(environ, headers)
+
+    def delete_cookie(self, server_name, key, path="/", domain=None):
+        """Deletes a cookie in the test client."""
+        self.set_cookie(
+            server_name, key, expires=0, max_age=0, path=path, domain=domain
+        )
+
+    def run_wsgi_app(self, environ, buffered=False):
+        """Runs the wrapped WSGI app with the given environment."""
+        if self.cookie_jar is not None:
+            self.cookie_jar.inject_wsgi(environ)
+        rv = run_wsgi_app(self.application, environ, buffered=buffered)
+        if self.cookie_jar is not None:
+            self.cookie_jar.extract_wsgi(environ, rv[2])
+        return rv
+
+    def resolve_redirect(self, response, new_location, environ, buffered=False):
+        """Perform a new request to the location given by the redirect
+        response to the previous request.
+        """
+        scheme, netloc, path, qs, anchor = url_parse(new_location)
+        builder = EnvironBuilder.from_environ(environ, query_string=qs)
+
+        to_name_parts = netloc.split(":", 1)[0].split(".")
+        from_name_parts = builder.server_name.split(".")
+
+        if to_name_parts != [""]:
+            # The new location has a host, use it for the base URL.
+            builder.url_scheme = scheme
+            builder.host = netloc
+        else:
+            # A local redirect with autocorrect_location_header=False
+            # doesn't have a host, so use the request's host.
+            to_name_parts = from_name_parts
+
+        # Explain why a redirect to a different server name won't be followed.
+        if to_name_parts != from_name_parts:
+            if to_name_parts[-len(from_name_parts) :] == from_name_parts:
+                if not self.allow_subdomain_redirects:
+                    raise RuntimeError("Following subdomain redirects is not enabled.")
+            else:
+                raise RuntimeError("Following external redirects is not supported.")
+
+        path_parts = path.split("/")
+        root_parts = builder.script_root.split("/")
+
+        if path_parts[: len(root_parts)] == root_parts:
+            # Strip the script root from the path.
+            builder.path = path[len(builder.script_root) :]
+        else:
+            # The new location is not under the script root, so use the
+            # whole path and clear the previous root.
+            builder.path = path
+            builder.script_root = ""
+
+        status_code = int(response[1].split(None, 1)[0])
+
+        # Only 307 and 308 preserve all of the original request.
+        if status_code not in {307, 308}:
+            # HEAD is preserved, everything else becomes GET.
+            if builder.method != "HEAD":
+                builder.method = "GET"
+
+            # Clear the body and the headers that describe it.
+            builder.input_stream = None
+            builder.content_type = None
+            builder.content_length = None
+            builder.headers.pop("Transfer-Encoding", None)
+
+        # Disable the response wrapper while handling redirects. Not
+        # thread safe, but the client should not be shared anyway.
+        old_response_wrapper = self.response_wrapper
+        self.response_wrapper = None
+
+        try:
+            return self.open(builder, as_tuple=True, buffered=buffered)
+        finally:
+            self.response_wrapper = old_response_wrapper
+
+    def open(self, *args, **kwargs):
+        """Takes the same arguments as the :class:`EnvironBuilder` class with
+        some additions:  You can provide a :class:`EnvironBuilder` or a WSGI
+        environment as only argument instead of the :class:`EnvironBuilder`
+        arguments and two optional keyword arguments (`as_tuple`, `buffered`)
+        that change the type of the return value or the way the application is
+        executed.
+
+        .. versionchanged:: 0.5
+           If a dict is provided as file in the dict for the `data` parameter
+           the content type has to be called `content_type` now instead of
+           `mimetype`.  This change was made for consistency with
+           :class:`werkzeug.FileWrapper`.
+
+            The `follow_redirects` parameter was added to :func:`open`.
+
+        Additional parameters:
+
+        :param as_tuple: Returns a tuple in the form ``(environ, result)``
+        :param buffered: Set this to True to buffer the application run.
+                         This will automatically close the application for
+                         you as well.
+        :param follow_redirects: Set this to True if the `Client` should
+                                 follow HTTP redirects.
+        """
+        as_tuple = kwargs.pop("as_tuple", False)
+        buffered = kwargs.pop("buffered", False)
+        follow_redirects = kwargs.pop("follow_redirects", False)
+        environ = None
+        if not kwargs and len(args) == 1:
+            if isinstance(args[0], EnvironBuilder):
+                environ = args[0].get_environ()
+            elif isinstance(args[0], dict):
+                environ = args[0]
+        if environ is None:
+            builder = EnvironBuilder(*args, **kwargs)
+            try:
+                environ = builder.get_environ()
+            finally:
+                builder.close()
+
+        response = self.run_wsgi_app(environ.copy(), buffered=buffered)
+
+        # handle redirects
+        redirect_chain = []
+        while 1:
+            status_code = int(response[1].split(None, 1)[0])
+            if (
+                status_code not in {301, 302, 303, 305, 307, 308}
+                or not follow_redirects
+            ):
+                break
+
+            # Exhaust intermediate response bodies to ensure middleware
+            # that returns an iterator runs any cleanup code.
+            if not buffered:
+                for _ in response[0]:
+                    pass
+
+            new_location = response[2]["location"]
+            new_redirect_entry = (new_location, status_code)
+            if new_redirect_entry in redirect_chain:
+                raise ClientRedirectError("loop detected")
+            redirect_chain.append(new_redirect_entry)
+            environ, response = self.resolve_redirect(
+                response, new_location, environ, buffered=buffered
+            )
+
+        if self.response_wrapper is not None:
+            response = self.response_wrapper(*response)
+        if as_tuple:
+            return environ, response
+        return response
+
+    def get(self, *args, **kw):
+        """Like open but method is enforced to GET."""
+        kw["method"] = "GET"
+        return self.open(*args, **kw)
+
+    def patch(self, *args, **kw):
+        """Like open but method is enforced to PATCH."""
+        kw["method"] = "PATCH"
+        return self.open(*args, **kw)
+
+    def post(self, *args, **kw):
+        """Like open but method is enforced to POST."""
+        kw["method"] = "POST"
+        return self.open(*args, **kw)
+
+    def head(self, *args, **kw):
+        """Like open but method is enforced to HEAD."""
+        kw["method"] = "HEAD"
+        return self.open(*args, **kw)
+
+    def put(self, *args, **kw):
+        """Like open but method is enforced to PUT."""
+        kw["method"] = "PUT"
+        return self.open(*args, **kw)
+
+    def delete(self, *args, **kw):
+        """Like open but method is enforced to DELETE."""
+        kw["method"] = "DELETE"
+        return self.open(*args, **kw)
+
+    def options(self, *args, **kw):
+        """Like open but method is enforced to OPTIONS."""
+        kw["method"] = "OPTIONS"
+        return self.open(*args, **kw)
+
+    def trace(self, *args, **kw):
+        """Like open but method is enforced to TRACE."""
+        kw["method"] = "TRACE"
+        return self.open(*args, **kw)
+
+    def __repr__(self):
+        return "<%s %r>" % (self.__class__.__name__, self.application)
+
+
+def create_environ(*args, **kwargs):
+    """Create a new WSGI environ dict based on the values passed.  The first
+    parameter should be the path of the request which defaults to '/'.  The
+    second one can either be an absolute path (in that case the host is
+    localhost:80) or a full path to the request with scheme, netloc port and
+    the path to the script.
+
+    This accepts the same arguments as the :class:`EnvironBuilder`
+    constructor.
+
+    .. versionchanged:: 0.5
+       This function is now a thin wrapper over :class:`EnvironBuilder` which
+       was added in 0.5.  The `headers`, `environ_base`, `environ_overrides`
+       and `charset` parameters were added.
+    """
+    builder = EnvironBuilder(*args, **kwargs)
+    try:
+        return builder.get_environ()
+    finally:
+        builder.close()
+
+
+def run_wsgi_app(app, environ, buffered=False):
+    """Return a tuple in the form (app_iter, status, headers) of the
+    application output.  This works best if you pass it an application that
+    returns an iterator all the time.
+
+    Sometimes applications may use the `write()` callable returned
+    by the `start_response` function.  This tries to resolve such edge
+    cases automatically.  But if you don't get the expected output you
+    should set `buffered` to `True` which enforces buffering.
+
+    If passed an invalid WSGI application the behavior of this function is
+    undefined.  Never pass non-conforming WSGI applications to this function.
+
+    :param app: the application to execute.
+    :param buffered: set to `True` to enforce buffering.
+    :return: tuple in the form ``(app_iter, status, headers)``
+    """
+    environ = _get_environ(environ)
+    response = []
+    buffer = []
+
+    def start_response(status, headers, exc_info=None):
+        if exc_info is not None:
+            reraise(*exc_info)
+        response[:] = [status, headers]
+        return buffer.append
+
+    app_rv = app(environ, start_response)
+    close_func = getattr(app_rv, "close", None)
+    app_iter = iter(app_rv)
+
+    # when buffering we emit the close call early and convert the
+    # application iterator into a regular list
+    if buffered:
+        try:
+            app_iter = list(app_iter)
+        finally:
+            if close_func is not None:
+                close_func()
+
+    # otherwise we iterate the application iter until we have a response, chain
+    # the already received data with the already collected data and wrap it in
+    # a new `ClosingIterator` if we need to restore a `close` callable from the
+    # original return value.
+    else:
+        for item in app_iter:
+            buffer.append(item)
+            if response:
+                break
+        if buffer:
+            app_iter = chain(buffer, app_iter)
+        if close_func is not None and app_iter is not app_rv:
+            app_iter = ClosingIterator(app_iter, close_func)
+
+    return app_iter, response[0], Headers(response[1])
diff --git a/venv/lib/python3.7/site-packages/werkzeug/testapp.py b/venv/lib/python3.7/site-packages/werkzeug/testapp.py
new file mode 100644
index 0000000..8ea23be
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/testapp.py
@@ -0,0 +1,241 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.testapp
+    ~~~~~~~~~~~~~~~~
+
+    Provide a small test application that can be used to test a WSGI server
+    and check it for WSGI compliance.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import base64
+import os
+import sys
+from textwrap import wrap
+
+import werkzeug
+from .utils import escape
+from .wrappers import BaseRequest as Request
+from .wrappers import BaseResponse as Response
+
+logo = Response(
+    base64.b64decode(
+        """
+R0lGODlhoACgAOMIAAEDACwpAEpCAGdgAJaKAM28AOnVAP3rAP/////////
+//////////////////////yH5BAEKAAgALAAAAACgAKAAAAT+EMlJq704680R+F0ojmRpnuj0rWnrv
+nB8rbRs33gu0bzu/0AObxgsGn3D5HHJbCUFyqZ0ukkSDlAidctNFg7gbI9LZlrBaHGtzAae0eloe25
+7w9EDOX2fst/xenyCIn5/gFqDiVVDV4aGeYiKkhSFjnCQY5OTlZaXgZp8nJ2ekaB0SQOjqphrpnOiq
+ncEn65UsLGytLVmQ6m4sQazpbtLqL/HwpnER8bHyLrLOc3Oz8PRONPU1crXN9na263dMt/g4SzjMeX
+m5yDpLqgG7OzJ4u8lT/P69ej3JPn69kHzN2OIAHkB9RUYSFCFQYQJFTIkCDBiwoXWGnowaLEjRm7+G
+p9A7Hhx4rUkAUaSLJlxHMqVMD/aSycSZkyTplCqtGnRAM5NQ1Ly5OmzZc6gO4d6DGAUKA+hSocWYAo
+SlM6oUWX2O/o0KdaVU5vuSQLAa0ADwQgMEMB2AIECZhVSnTno6spgbtXmHcBUrQACcc2FrTrWS8wAf
+78cMFBgwIBgbN+qvTt3ayikRBk7BoyGAGABAdYyfdzRQGV3l4coxrqQ84GpUBmrdR3xNIDUPAKDBSA
+ADIGDhhqTZIWaDcrVX8EsbNzbkvCOxG8bN5w8ly9H8jyTJHC6DFndQydbguh2e/ctZJFXRxMAqqPVA
+tQH5E64SPr1f0zz7sQYjAHg0In+JQ11+N2B0XXBeeYZgBZFx4tqBToiTCPv0YBgQv8JqA6BEf6RhXx
+w1ENhRBnWV8ctEX4Ul2zc3aVGcQNC2KElyTDYyYUWvShdjDyMOGMuFjqnII45aogPhz/CodUHFwaDx
+lTgsaOjNyhGWJQd+lFoAGk8ObghI0kawg+EV5blH3dr+digkYuAGSaQZFHFz2P/cTaLmhF52QeSb45
+Jwxd+uSVGHlqOZpOeJpCFZ5J+rkAkFjQ0N1tah7JJSZUFNsrkeJUJMIBi8jyaEKIhKPomnC91Uo+NB
+yyaJ5umnnpInIFh4t6ZSpGaAVmizqjpByDegYl8tPE0phCYrhcMWSv+uAqHfgH88ak5UXZmlKLVJhd
+dj78s1Fxnzo6yUCrV6rrDOkluG+QzCAUTbCwf9SrmMLzK6p+OPHx7DF+bsfMRq7Ec61Av9i6GLw23r
+idnZ+/OO0a99pbIrJkproCQMA17OPG6suq3cca5ruDfXCCDoS7BEdvmJn5otdqscn+uogRHHXs8cbh
+EIfYaDY1AkrC0cqwcZpnM6ludx72x0p7Fo/hZAcpJDjax0UdHavMKAbiKltMWCF3xxh9k25N/Viud8
+ba78iCvUkt+V6BpwMlErmcgc502x+u1nSxJSJP9Mi52awD1V4yB/QHONsnU3L+A/zR4VL/indx/y64
+gqcj+qgTeweM86f0Qy1QVbvmWH1D9h+alqg254QD8HJXHvjQaGOqEqC22M54PcftZVKVSQG9jhkv7C
+JyTyDoAJfPdu8v7DRZAxsP/ky9MJ3OL36DJfCFPASC3/aXlfLOOON9vGZZHydGf8LnxYJuuVIbl83y
+Az5n/RPz07E+9+zw2A2ahz4HxHo9Kt79HTMx1Q7ma7zAzHgHqYH0SoZWyTuOLMiHwSfZDAQTn0ajk9
+YQqodnUYjByQZhZak9Wu4gYQsMyEpIOAOQKze8CmEF45KuAHTvIDOfHJNipwoHMuGHBnJElUoDmAyX
+c2Qm/R8Ah/iILCCJOEokGowdhDYc/yoL+vpRGwyVSCWFYZNljkhEirGXsalWcAgOdeAdoXcktF2udb
+qbUhjWyMQxYO01o6KYKOr6iK3fE4MaS+DsvBsGOBaMb0Y6IxADaJhFICaOLmiWTlDAnY1KzDG4ambL
+cWBA8mUzjJsN2KjSaSXGqMCVXYpYkj33mcIApyhQf6YqgeNAmNvuC0t4CsDbSshZJkCS1eNisKqlyG
+cF8G2JeiDX6tO6Mv0SmjCa3MFb0bJaGPMU0X7c8XcpvMaOQmCajwSeY9G0WqbBmKv34DsMIEztU6Y2
+KiDlFdt6jnCSqx7Dmt6XnqSKaFFHNO5+FmODxMCWBEaco77lNDGXBM0ECYB/+s7nKFdwSF5hgXumQe
+EZ7amRg39RHy3zIjyRCykQh8Zo2iviRKyTDn/zx6EefptJj2Cw+Ep2FSc01U5ry4KLPYsTyWnVGnvb
+UpyGlhjBUljyjHhWpf8OFaXwhp9O4T1gU9UeyPPa8A2l0p1kNqPXEVRm1AOs1oAGZU596t6SOR2mcB
+Oco1srWtkaVrMUzIErrKri85keKqRQYX9VX0/eAUK1hrSu6HMEX3Qh2sCh0q0D2CtnUqS4hj62sE/z
+aDs2Sg7MBS6xnQeooc2R2tC9YrKpEi9pLXfYXp20tDCpSP8rKlrD4axprb9u1Df5hSbz9QU0cRpfgn
+kiIzwKucd0wsEHlLpe5yHXuc6FrNelOl7pY2+11kTWx7VpRu97dXA3DO1vbkhcb4zyvERYajQgAADs
+="""
+    ),
+    mimetype="image/png",
+)
+
+
+TEMPLATE = u"""\
+
+WSGI Information
+
+
    
+  
+  
    WSGI Information
    
+  
    
+    This page displays all available information about the WSGI server and
+    the underlying Python interpreter.
+  
    Python Interpreter
    
+  
+    
+      
+      
+      
+      
+      
    Python Version
+      %(python_version)s
+    
    Platform
+      %(platform)s [%(os)s]
+    
    API Version
+      %(api_version)s
+    
    Byteorder
+      %(byteorder)s
+    
    Werkzeug Version
+      %(werkzeug_version)s
+  
    
+  
    WSGI Environment
    
+  %(wsgi_env)s
    
+  
    Installed Eggs
    
+  
    
+    The following python packages were installed on the system as
+    Python eggs:
+  
      %(python_eggs)s
    
+  
    System Path
    
+  
    
+    The following paths are the current contents of the load path.  The
+    following entries are looked up for Python packages.  Note that not
+    all items in this path are folders.  Gray and underlined items are
+    entries pointing to invalid resources or used by custom import hooks
+    such as the zip importer.
+  
    
+    Items with a bright background were expanded for display from a relative
+    path.  If you encounter such paths in the output you might want to check
+    your setup as relative paths are usually problematic in multithreaded
+    environments.
+  
      %(sys_path)s
    
+
    
+"""
+
+
+def iter_sys_path():
+    if os.name == "posix":
+
+        def strip(x):
+            prefix = os.path.expanduser("~")
+            if x.startswith(prefix):
+                x = "~" + x[len(prefix) :]
+            return x
+
+    else:
+
+        def strip(x):
+            return x
+
+    cwd = os.path.abspath(os.getcwd())
+    for item in sys.path:
+        path = os.path.join(cwd, item or os.path.curdir)
+        yield strip(os.path.normpath(path)), not os.path.isdir(path), path != item
+
+
+def render_testapp(req):
+    try:
+        import pkg_resources
+    except ImportError:
+        eggs = ()
+    else:
+        eggs = sorted(pkg_resources.working_set, key=lambda x: x.project_name.lower())
+    python_eggs = []
+    for egg in eggs:
+        try:
+            version = egg.version
+        except (ValueError, AttributeError):
+            version = "unknown"
+        python_eggs.append(
+            "
  • %s [%s]" % (escape(egg.project_name), escape(version))
+        )
+
+    wsgi_env = []
+    sorted_environ = sorted(req.environ.items(), key=lambda x: repr(x[0]).lower())
+    for key, value in sorted_environ:
+        wsgi_env.append(
+            "%s%s"
+            % (escape(str(key)), " ".join(wrap(escape(repr(value)))))
+        )
+
+    sys_path = []
+    for item, virtual, expanded in iter_sys_path():
+        class_ = []
+        if virtual:
+            class_.append("virtual")
+        if expanded:
+            class_.append("exp")
+        sys_path.append(
+            "%s"
+            % (' class="%s"' % " ".join(class_) if class_ else "", escape(item))
+        )
+
+    return (
+        TEMPLATE
+        % {
+            "python_version": "
    ".join(escape(sys.version).splitlines()),
+            "platform": escape(sys.platform),
+            "os": escape(os.name),
+            "api_version": sys.api_version,
+            "byteorder": sys.byteorder,
+            "werkzeug_version": werkzeug.__version__,
+            "python_eggs": "\n".join(python_eggs),
+            "wsgi_env": "\n".join(wsgi_env),
+            "sys_path": "\n".join(sys_path),
+        }
+    ).encode("utf-8")
+
+
+def test_app(environ, start_response):
+    """Simple test application that dumps the environment.  You can use
+    it to check if Werkzeug is working properly:
+
+    .. sourcecode:: pycon
+
+        >>> from werkzeug.serving import run_simple
+        >>> from werkzeug.testapp import test_app
+        >>> run_simple('localhost', 3000, test_app)
+         * Running on http://localhost:3000/
+
+    The application displays important information from the WSGI environment,
+    the Python interpreter and the installed libraries.
+    """
+    req = Request(environ, populate_request=False)
+    if req.args.get("resource") == "logo":
+        response = logo
+    else:
+        response = Response(render_testapp(req), mimetype="text/html")
+    return response(environ, start_response)
+
+
+if __name__ == "__main__":
+    from .serving import run_simple
+
+    run_simple("localhost", 5000, test_app, use_reloader=True)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/urls.py b/venv/lib/python3.7/site-packages/werkzeug/urls.py
new file mode 100644
index 0000000..38e9e5a
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/urls.py
@@ -0,0 +1,1134 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.urls
+    ~~~~~~~~~~~~~
+
+    ``werkzeug.urls`` used to provide several wrapper functions for Python 2
+    urlparse, whose main purpose were to work around the behavior of the Py2
+    stdlib and its lack of unicode support. While this was already a somewhat
+    inconvenient situation, it got even more complicated because Python 3's
+    ``urllib.parse`` actually does handle unicode properly. In other words,
+    this module would wrap two libraries with completely different behavior. So
+    now this module contains a 2-and-3-compatible backport of Python 3's
+    ``urllib.parse``, which is mostly API-compatible.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import codecs
+import os
+import re
+from collections import namedtuple
+
+from ._compat import fix_tuple_repr
+from ._compat import implements_to_string
+from ._compat import make_literal_wrapper
+from ._compat import normalize_string_tuple
+from ._compat import PY2
+from ._compat import text_type
+from ._compat import to_native
+from ._compat import to_unicode
+from ._compat import try_coerce_native
+from ._internal import _decode_idna
+from ._internal import _encode_idna
+from .datastructures import iter_multi_items
+from .datastructures import MultiDict
+
+# A regular expression for what a valid schema looks like
+_scheme_re = re.compile(r"^[a-zA-Z0-9+-.]+$")
+
+# Characters that are safe in any part of an URL.
+_always_safe = frozenset(
+    bytearray(
+        b"abcdefghijklmnopqrstuvwxyz"
+        b"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        b"0123456789"
+        b"-._~"
+    )
+)
+
+_hexdigits = "0123456789ABCDEFabcdef"
+_hextobyte = dict(
+    ((a + b).encode(), int(a + b, 16)) for a in _hexdigits for b in _hexdigits
+)
+_bytetohex = [("%%%02X" % char).encode("ascii") for char in range(256)]
+
+
+_URLTuple = fix_tuple_repr(
+    namedtuple("_URLTuple", ["scheme", "netloc", "path", "query", "fragment"])
+)
+
+
+class BaseURL(_URLTuple):
+    """Superclass of :py:class:`URL` and :py:class:`BytesURL`."""
+
+    __slots__ = ()
+
+    def replace(self, **kwargs):
+        """Return an URL with the same values, except for those parameters
+        given new values by whichever keyword arguments are specified."""
+        return self._replace(**kwargs)
+
+    @property
+    def host(self):
+        """The host part of the URL if available, otherwise `None`.  The
+        host is either the hostname or the IP address mentioned in the
+        URL.  It will not contain the port.
+        """
+        return self._split_host()[0]
+
+    @property
+    def ascii_host(self):
+        """Works exactly like :attr:`host` but will return a result that
+        is restricted to ASCII.  If it finds a netloc that is not ASCII
+        it will attempt to idna decode it.  This is useful for socket
+        operations when the URL might include internationalized characters.
+        """
+        rv = self.host
+        if rv is not None and isinstance(rv, text_type):
+            try:
+                rv = _encode_idna(rv)
+            except UnicodeError:
+                rv = rv.encode("ascii", "ignore")
+        return to_native(rv, "ascii", "ignore")
+
+    @property
+    def port(self):
+        """The port in the URL as an integer if it was present, `None`
+        otherwise.  This does not fill in default ports.
+        """
+        try:
+            rv = int(to_native(self._split_host()[1]))
+            if 0 <= rv <= 65535:
+                return rv
+        except (ValueError, TypeError):
+            pass
+
+    @property
+    def auth(self):
+        """The authentication part in the URL if available, `None`
+        otherwise.
+        """
+        return self._split_netloc()[0]
+
+    @property
+    def username(self):
+        """The username if it was part of the URL, `None` otherwise.
+        This undergoes URL decoding and will always be a unicode string.
+        """
+        rv = self._split_auth()[0]
+        if rv is not None:
+            return _url_unquote_legacy(rv)
+
+    @property
+    def raw_username(self):
+        """The username if it was part of the URL, `None` otherwise.
+        Unlike :attr:`username` this one is not being decoded.
+        """
+        return self._split_auth()[0]
+
+    @property
+    def password(self):
+        """The password if it was part of the URL, `None` otherwise.
+        This undergoes URL decoding and will always be a unicode string.
+        """
+        rv = self._split_auth()[1]
+        if rv is not None:
+            return _url_unquote_legacy(rv)
+
+    @property
+    def raw_password(self):
+        """The password if it was part of the URL, `None` otherwise.
+        Unlike :attr:`password` this one is not being decoded.
+        """
+        return self._split_auth()[1]
+
+    def decode_query(self, *args, **kwargs):
+        """Decodes the query part of the URL.  Ths is a shortcut for
+        calling :func:`url_decode` on the query argument.  The arguments and
+        keyword arguments are forwarded to :func:`url_decode` unchanged.
+        """
+        return url_decode(self.query, *args, **kwargs)
+
+    def join(self, *args, **kwargs):
+        """Joins this URL with another one.  This is just a convenience
+        function for calling into :meth:`url_join` and then parsing the
+        return value again.
+        """
+        return url_parse(url_join(self, *args, **kwargs))
+
+    def to_url(self):
+        """Returns a URL string or bytes depending on the type of the
+        information stored.  This is just a convenience function
+        for calling :meth:`url_unparse` for this URL.
+        """
+        return url_unparse(self)
+
+    def decode_netloc(self):
+        """Decodes the netloc part into a string."""
+        rv = _decode_idna(self.host or "")
+
+        if ":" in rv:
+            rv = "[%s]" % rv
+        port = self.port
+        if port is not None:
+            rv = "%s:%d" % (rv, port)
+        auth = ":".join(
+            filter(
+                None,
+                [
+                    _url_unquote_legacy(self.raw_username or "", "/:%@"),
+                    _url_unquote_legacy(self.raw_password or "", "/:%@"),
+                ],
+            )
+        )
+        if auth:
+            rv = "%s@%s" % (auth, rv)
+        return rv
+
+    def to_uri_tuple(self):
+        """Returns a :class:`BytesURL` tuple that holds a URI.  This will
+        encode all the information in the URL properly to ASCII using the
+        rules a web browser would follow.
+
+        It's usually more interesting to directly call :meth:`iri_to_uri` which
+        will return a string.
+        """
+        return url_parse(iri_to_uri(self).encode("ascii"))
+
+    def to_iri_tuple(self):
+        """Returns a :class:`URL` tuple that holds a IRI.  This will try
+        to decode as much information as possible in the URL without
+        losing information similar to how a web browser does it for the
+        URL bar.
+
+        It's usually more interesting to directly call :meth:`uri_to_iri` which
+        will return a string.
+        """
+        return url_parse(uri_to_iri(self))
+
+    def get_file_location(self, pathformat=None):
+        """Returns a tuple with the location of the file in the form
+        ``(server, location)``.  If the netloc is empty in the URL or
+        points to localhost, it's represented as ``None``.
+
+        The `pathformat` by default is autodetection but needs to be set
+        when working with URLs of a specific system.  The supported values
+        are ``'windows'`` when working with Windows or DOS paths and
+        ``'posix'`` when working with posix paths.
+
+        If the URL does not point to a local file, the server and location
+        are both represented as ``None``.
+
+        :param pathformat: The expected format of the path component.
+                           Currently ``'windows'`` and ``'posix'`` are
+                           supported.  Defaults to ``None`` which is
+                           autodetect.
+        """
+        if self.scheme != "file":
+            return None, None
+
+        path = url_unquote(self.path)
+        host = self.netloc or None
+
+        if pathformat is None:
+            if os.name == "nt":
+                pathformat = "windows"
+            else:
+                pathformat = "posix"
+
+        if pathformat == "windows":
+            if path[:1] == "/" and path[1:2].isalpha() and path[2:3] in "|:":
+                path = path[1:2] + ":" + path[3:]
+            windows_share = path[:3] in ("\\" * 3, "/" * 3)
+            import ntpath
+
+            path = ntpath.normpath(path)
+            # Windows shared drives are represented as ``\\host\\directory``.
+            # That results in a URL like ``file://///host/directory``, and a
+            # path like ``///host/directory``. We need to special-case this
+            # because the path contains the hostname.
+            if windows_share and host is None:
+                parts = path.lstrip("\\").split("\\", 1)
+                if len(parts) == 2:
+                    host, path = parts
+                else:
+                    host = parts[0]
+                    path = ""
+        elif pathformat == "posix":
+            import posixpath
+
+            path = posixpath.normpath(path)
+        else:
+            raise TypeError("Invalid path format %s" % repr(pathformat))
+
+        if host in ("127.0.0.1", "::1", "localhost"):
+            host = None
+
+        return host, path
+
+    def _split_netloc(self):
+        if self._at in self.netloc:
+            return self.netloc.split(self._at, 1)
+        return None, self.netloc
+
+    def _split_auth(self):
+        auth = self._split_netloc()[0]
+        if not auth:
+            return None, None
+        if self._colon not in auth:
+            return auth, None
+        return auth.split(self._colon, 1)
+
+    def _split_host(self):
+        rv = self._split_netloc()[1]
+        if not rv:
+            return None, None
+
+        if not rv.startswith(self._lbracket):
+            if self._colon in rv:
+                return rv.split(self._colon, 1)
+            return rv, None
+
+        idx = rv.find(self._rbracket)
+        if idx < 0:
+            return rv, None
+
+        host = rv[1:idx]
+        rest = rv[idx + 1 :]
+        if rest.startswith(self._colon):
+            return host, rest[1:]
+        return host, None
+
+
+@implements_to_string
+class URL(BaseURL):
+    """Represents a parsed URL.  This behaves like a regular tuple but
+    also has some extra attributes that give further insight into the
+    URL.
+    """
+
+    __slots__ = ()
+    _at = "@"
+    _colon = ":"
+    _lbracket = "["
+    _rbracket = "]"
+
+    def __str__(self):
+        return self.to_url()
+
+    def encode_netloc(self):
+        """Encodes the netloc part to an ASCII safe URL as bytes."""
+        rv = self.ascii_host or ""
+        if ":" in rv:
+            rv = "[%s]" % rv
+        port = self.port
+        if port is not None:
+            rv = "%s:%d" % (rv, port)
+        auth = ":".join(
+            filter(
+                None,
+                [
+                    url_quote(self.raw_username or "", "utf-8", "strict", "/:%"),
+                    url_quote(self.raw_password or "", "utf-8", "strict", "/:%"),
+                ],
+            )
+        )
+        if auth:
+            rv = "%s@%s" % (auth, rv)
+        return to_native(rv)
+
+    def encode(self, charset="utf-8", errors="replace"):
+        """Encodes the URL to a tuple made out of bytes.  The charset is
+        only being used for the path, query and fragment.
+        """
+        return BytesURL(
+            self.scheme.encode("ascii"),
+            self.encode_netloc(),
+            self.path.encode(charset, errors),
+            self.query.encode(charset, errors),
+            self.fragment.encode(charset, errors),
+        )
+
+
+class BytesURL(BaseURL):
+    """Represents a parsed URL in bytes."""
+
+    __slots__ = ()
+    _at = b"@"
+    _colon = b":"
+    _lbracket = b"["
+    _rbracket = b"]"
+
+    def __str__(self):
+        return self.to_url().decode("utf-8", "replace")
+
+    def encode_netloc(self):
+        """Returns the netloc unchanged as bytes."""
+        return self.netloc
+
+    def decode(self, charset="utf-8", errors="replace"):
+        """Decodes the URL to a tuple made out of strings.  The charset is
+        only being used for the path, query and fragment.
+        """
+        return URL(
+            self.scheme.decode("ascii"),
+            self.decode_netloc(),
+            self.path.decode(charset, errors),
+            self.query.decode(charset, errors),
+            self.fragment.decode(charset, errors),
+        )
+
+
+_unquote_maps = {frozenset(): _hextobyte}
+
+
+def _unquote_to_bytes(string, unsafe=""):
+    if isinstance(string, text_type):
+        string = string.encode("utf-8")
+
+    if isinstance(unsafe, text_type):
+        unsafe = unsafe.encode("utf-8")
+
+    unsafe = frozenset(bytearray(unsafe))
+    groups = iter(string.split(b"%"))
+    result = bytearray(next(groups, b""))
+
+    try:
+        hex_to_byte = _unquote_maps[unsafe]
+    except KeyError:
+        hex_to_byte = _unquote_maps[unsafe] = {
+            h: b for h, b in _hextobyte.items() if b not in unsafe
+        }
+
+    for group in groups:
+        code = group[:2]
+
+        if code in hex_to_byte:
+            result.append(hex_to_byte[code])
+            result.extend(group[2:])
+        else:
+            result.append(37)  # %
+            result.extend(group)
+
+    return bytes(result)
+
+
+def _url_encode_impl(obj, charset, encode_keys, sort, key):
+    iterable = iter_multi_items(obj)
+    if sort:
+        iterable = sorted(iterable, key=key)
+    for key, value in iterable:
+        if value is None:
+            continue
+        if not isinstance(key, bytes):
+            key = text_type(key).encode(charset)
+        if not isinstance(value, bytes):
+            value = text_type(value).encode(charset)
+        yield _fast_url_quote_plus(key) + "=" + _fast_url_quote_plus(value)
+
+
+def _url_unquote_legacy(value, unsafe=""):
+    try:
+        return url_unquote(value, charset="utf-8", errors="strict", unsafe=unsafe)
+    except UnicodeError:
+        return url_unquote(value, charset="latin1", unsafe=unsafe)
+
+
+def url_parse(url, scheme=None, allow_fragments=True):
+    """Parses a URL from a string into a :class:`URL` tuple.  If the URL
+    is lacking a scheme it can be provided as second argument. Otherwise,
+    it is ignored.  Optionally fragments can be stripped from the URL
+    by setting `allow_fragments` to `False`.
+
+    The inverse of this function is :func:`url_unparse`.
+
+    :param url: the URL to parse.
+    :param scheme: the default schema to use if the URL is schemaless.
+    :param allow_fragments: if set to `False` a fragment will be removed
+                            from the URL.
+    """
+    s = make_literal_wrapper(url)
+    is_text_based = isinstance(url, text_type)
+
+    if scheme is None:
+        scheme = s("")
+    netloc = query = fragment = s("")
+    i = url.find(s(":"))
+    if i > 0 and _scheme_re.match(to_native(url[:i], errors="replace")):
+        # make sure "iri" is not actually a port number (in which case
+        # "scheme" is really part of the path)
+        rest = url[i + 1 :]
+        if not rest or any(c not in s("0123456789") for c in rest):
+            # not a port number
+            scheme, url = url[:i].lower(), rest
+
+    if url[:2] == s("//"):
+        delim = len(url)
+        for c in s("/?#"):
+            wdelim = url.find(c, 2)
+            if wdelim >= 0:
+                delim = min(delim, wdelim)
+        netloc, url = url[2:delim], url[delim:]
+        if (s("[") in netloc and s("]") not in netloc) or (
+            s("]") in netloc and s("[") not in netloc
+        ):
+            raise ValueError("Invalid IPv6 URL")
+
+    if allow_fragments and s("#") in url:
+        url, fragment = url.split(s("#"), 1)
+    if s("?") in url:
+        url, query = url.split(s("?"), 1)
+
+    result_type = URL if is_text_based else BytesURL
+    return result_type(scheme, netloc, url, query, fragment)
+
+
+def _make_fast_url_quote(charset="utf-8", errors="strict", safe="/:", unsafe=""):
+    """Precompile the translation table for a URL encoding function.
+
+    Unlike :func:`url_quote`, the generated function only takes the
+    string to quote.
+
+    :param charset: The charset to encode the result with.
+    :param errors: How to handle encoding errors.
+    :param safe: An optional sequence of safe characters to never encode.
+    :param unsafe: An optional sequence of unsafe characters to always encode.
+    """
+    if isinstance(safe, text_type):
+        safe = safe.encode(charset, errors)
+
+    if isinstance(unsafe, text_type):
+        unsafe = unsafe.encode(charset, errors)
+
+    safe = (frozenset(bytearray(safe)) | _always_safe) - frozenset(bytearray(unsafe))
+    table = [chr(c) if c in safe else "%%%02X" % c for c in range(256)]
+
+    if not PY2:
+
+        def quote(string):
+            return "".join([table[c] for c in string])
+
+    else:
+
+        def quote(string):
+            return "".join([table[c] for c in bytearray(string)])
+
+    return quote
+
+
+_fast_url_quote = _make_fast_url_quote()
+_fast_quote_plus = _make_fast_url_quote(safe=" ", unsafe="+")
+
+
+def _fast_url_quote_plus(string):
+    return _fast_quote_plus(string).replace(" ", "+")
+
+
+def url_quote(string, charset="utf-8", errors="strict", safe="/:", unsafe=""):
+    """URL encode a single string with a given encoding.
+
+    :param s: the string to quote.
+    :param charset: the charset to be used.
+    :param safe: an optional sequence of safe characters.
+    :param unsafe: an optional sequence of unsafe characters.
+
+    .. versionadded:: 0.9.2
+       The `unsafe` parameter was added.
+    """
+    if not isinstance(string, (text_type, bytes, bytearray)):
+        string = text_type(string)
+    if isinstance(string, text_type):
+        string = string.encode(charset, errors)
+    if isinstance(safe, text_type):
+        safe = safe.encode(charset, errors)
+    if isinstance(unsafe, text_type):
+        unsafe = unsafe.encode(charset, errors)
+    safe = (frozenset(bytearray(safe)) | _always_safe) - frozenset(bytearray(unsafe))
+    rv = bytearray()
+    for char in bytearray(string):
+        if char in safe:
+            rv.append(char)
+        else:
+            rv.extend(_bytetohex[char])
+    return to_native(bytes(rv))
+
+
+def url_quote_plus(string, charset="utf-8", errors="strict", safe=""):
+    """URL encode a single string with the given encoding and convert
+    whitespace to "+".
+
+    :param s: The string to quote.
+    :param charset: The charset to be used.
+    :param safe: An optional sequence of safe characters.
+    """
+    return url_quote(string, charset, errors, safe + " ", "+").replace(" ", "+")
+
+
+def url_unparse(components):
+    """The reverse operation to :meth:`url_parse`.  This accepts arbitrary
+    as well as :class:`URL` tuples and returns a URL as a string.
+
+    :param components: the parsed URL as tuple which should be converted
+                       into a URL string.
+    """
+    scheme, netloc, path, query, fragment = normalize_string_tuple(components)
+    s = make_literal_wrapper(scheme)
+    url = s("")
+
+    # We generally treat file:///x and file:/x the same which is also
+    # what browsers seem to do.  This also allows us to ignore a schema
+    # register for netloc utilization or having to differenciate between
+    # empty and missing netloc.
+    if netloc or (scheme and path.startswith(s("/"))):
+        if path and path[:1] != s("/"):
+            path = s("/") + path
+        url = s("//") + (netloc or s("")) + path
+    elif path:
+        url += path
+    if scheme:
+        url = scheme + s(":") + url
+    if query:
+        url = url + s("?") + query
+    if fragment:
+        url = url + s("#") + fragment
+    return url
+
+
+def url_unquote(string, charset="utf-8", errors="replace", unsafe=""):
+    """URL decode a single string with a given encoding.  If the charset
+    is set to `None` no unicode decoding is performed and raw bytes
+    are returned.
+
+    :param s: the string to unquote.
+    :param charset: the charset of the query string.  If set to `None`
+                    no unicode decoding will take place.
+    :param errors: the error handling for the charset decoding.
+    """
+    rv = _unquote_to_bytes(string, unsafe)
+    if charset is not None:
+        rv = rv.decode(charset, errors)
+    return rv
+
+
+def url_unquote_plus(s, charset="utf-8", errors="replace"):
+    """URL decode a single string with the given `charset` and decode "+" to
+    whitespace.
+
+    Per default encoding errors are ignored.  If you want a different behavior
+    you can set `errors` to ``'replace'`` or ``'strict'``.  In strict mode a
+    :exc:`HTTPUnicodeError` is raised.
+
+    :param s: The string to unquote.
+    :param charset: the charset of the query string.  If set to `None`
+                    no unicode decoding will take place.
+    :param errors: The error handling for the `charset` decoding.
+    """
+    if isinstance(s, text_type):
+        s = s.replace(u"+", u" ")
+    else:
+        s = s.replace(b"+", b" ")
+    return url_unquote(s, charset, errors)
+
+
+def url_fix(s, charset="utf-8"):
+    r"""Sometimes you get an URL by a user that just isn't a real URL because
+    it contains unsafe characters like ' ' and so on. This function can fix
+    some of the problems in a similar way browsers handle data entered by the
+    user:
+
+    >>> url_fix(u'http://de.wikipedia.org/wiki/Elf (Begriffskl\xe4rung)')
+    'http://de.wikipedia.org/wiki/Elf%20(Begriffskl%C3%A4rung)'
+
+    :param s: the string with the URL to fix.
+    :param charset: The target charset for the URL if the url was given as
+                    unicode string.
+    """
+    # First step is to switch to unicode processing and to convert
+    # backslashes (which are invalid in URLs anyways) to slashes.  This is
+    # consistent with what Chrome does.
+    s = to_unicode(s, charset, "replace").replace("\\", "/")
+
+    # For the specific case that we look like a malformed windows URL
+    # we want to fix this up manually:
+    if s.startswith("file://") and s[7:8].isalpha() and s[8:10] in (":/", "|/"):
+        s = "file:///" + s[7:]
+
+    url = url_parse(s)
+    path = url_quote(url.path, charset, safe="/%+$!*'(),")
+    qs = url_quote_plus(url.query, charset, safe=":&%=+$!*'(),")
+    anchor = url_quote_plus(url.fragment, charset, safe=":&%=+$!*'(),")
+    return to_native(url_unparse((url.scheme, url.encode_netloc(), path, qs, anchor)))
+
+
+# not-unreserved characters remain quoted when unquoting to IRI
+_to_iri_unsafe = "".join([chr(c) for c in range(128) if c not in _always_safe])
+
+
+def _codec_error_url_quote(e):
+    """Used in :func:`uri_to_iri` after unquoting to re-quote any
+    invalid bytes.
+    """
+    out = _fast_url_quote(e.object[e.start : e.end])
+
+    if PY2:
+        out = out.decode("utf-8")
+
+    return out, e.end
+
+
+codecs.register_error("werkzeug.url_quote", _codec_error_url_quote)
+
+
+def uri_to_iri(uri, charset="utf-8", errors="werkzeug.url_quote"):
+    """Convert a URI to an IRI. All valid UTF-8 characters are unquoted,
+    leaving all reserved and invalid characters quoted. If the URL has
+    a domain, it is decoded from Punycode.
+
+    >>> uri_to_iri("http://xn--n3h.net/p%C3%A5th?q=%C3%A8ry%DF")
+    'http://\\u2603.net/p\\xe5th?q=\\xe8ry%DF'
+
+    :param uri: The URI to convert.
+    :param charset: The encoding to encode unquoted bytes with.
+    :param errors: Error handler to use during ``bytes.encode``. By
+        default, invalid bytes are left quoted.
+
+    .. versionchanged:: 0.15
+        All reserved and invalid characters remain quoted. Previously,
+        only some reserved characters were preserved, and invalid bytes
+        were replaced instead of left quoted.
+
+    .. versionadded:: 0.6
+    """
+    if isinstance(uri, tuple):
+        uri = url_unparse(uri)
+
+    uri = url_parse(to_unicode(uri, charset))
+    path = url_unquote(uri.path, charset, errors, _to_iri_unsafe)
+    query = url_unquote(uri.query, charset, errors, _to_iri_unsafe)
+    fragment = url_unquote(uri.fragment, charset, errors, _to_iri_unsafe)
+    return url_unparse((uri.scheme, uri.decode_netloc(), path, query, fragment))
+
+
+# reserved characters remain unquoted when quoting to URI
+_to_uri_safe = ":/?#[]@!$&'()*+,;=%"
+
+
+def iri_to_uri(iri, charset="utf-8", errors="strict", safe_conversion=False):
+    """Convert an IRI to a URI. All non-ASCII and unsafe characters are
+    quoted. If the URL has a domain, it is encoded to Punycode.
+
+    >>> iri_to_uri('http://\\u2603.net/p\\xe5th?q=\\xe8ry%DF')
+    'http://xn--n3h.net/p%C3%A5th?q=%C3%A8ry%DF'
+
+    :param iri: The IRI to convert.
+    :param charset: The encoding of the IRI.
+    :param errors: Error handler to use during ``bytes.encode``.
+    :param safe_conversion: Return the URL unchanged if it only contains
+        ASCII characters and no whitespace. See the explanation below.
+
+    There is a general problem with IRI conversion with some protocols
+    that are in violation of the URI specification. Consider the
+    following two IRIs::
+
+        magnet:?xt=uri:whatever
+        itms-services://?action=download-manifest
+
+    After parsing, we don't know if the scheme requires the ``//``,
+    which is dropped if empty, but conveys different meanings in the
+    final URL if it's present or not. In this case, you can use
+    ``safe_conversion``, which will return the URL unchanged if it only
+    contains ASCII characters and no whitespace. This can result in a
+    URI with unquoted characters if it was not already quoted correctly,
+    but preserves the URL's semantics. Werkzeug uses this for the
+    ``Location`` header for redirects.
+
+    .. versionchanged:: 0.15
+        All reserved characters remain unquoted. Previously, only some
+        reserved characters were left unquoted.
+
+    .. versionchanged:: 0.9.6
+       The ``safe_conversion`` parameter was added.
+
+    .. versionadded:: 0.6
+    """
+    if isinstance(iri, tuple):
+        iri = url_unparse(iri)
+
+    if safe_conversion:
+        # If we're not sure if it's safe to convert the URL, and it only
+        # contains ASCII characters, return it unconverted.
+        try:
+            native_iri = to_native(iri)
+            ascii_iri = native_iri.encode("ascii")
+
+            # Only return if it doesn't have whitespace. (Why?)
+            if len(ascii_iri.split()) == 1:
+                return native_iri
+        except UnicodeError:
+            pass
+
+    iri = url_parse(to_unicode(iri, charset, errors))
+    path = url_quote(iri.path, charset, errors, _to_uri_safe)
+    query = url_quote(iri.query, charset, errors, _to_uri_safe)
+    fragment = url_quote(iri.fragment, charset, errors, _to_uri_safe)
+    return to_native(
+        url_unparse((iri.scheme, iri.encode_netloc(), path, query, fragment))
+    )
+
+
+def url_decode(
+    s,
+    charset="utf-8",
+    decode_keys=False,
+    include_empty=True,
+    errors="replace",
+    separator="&",
+    cls=None,
+):
+    """
+    Parse a querystring and return it as :class:`MultiDict`.  There is a
+    difference in key decoding on different Python versions.  On Python 3
+    keys will always be fully decoded whereas on Python 2, keys will
+    remain bytestrings if they fit into ASCII.  On 2.x keys can be forced
+    to be unicode by setting `decode_keys` to `True`.
+
+    If the charset is set to `None` no unicode decoding will happen and
+    raw bytes will be returned.
+
+    Per default a missing value for a key will default to an empty key.  If
+    you don't want that behavior you can set `include_empty` to `False`.
+
+    Per default encoding errors are ignored.  If you want a different behavior
+    you can set `errors` to ``'replace'`` or ``'strict'``.  In strict mode a
+    `HTTPUnicodeError` is raised.
+
+    .. versionchanged:: 0.5
+       In previous versions ";" and "&" could be used for url decoding.
+       This changed in 0.5 where only "&" is supported.  If you want to
+       use ";" instead a different `separator` can be provided.
+
+       The `cls` parameter was added.
+
+    :param s: a string with the query string to decode.
+    :param charset: the charset of the query string.  If set to `None`
+                    no unicode decoding will take place.
+    :param decode_keys: Used on Python 2.x to control whether keys should
+                        be forced to be unicode objects.  If set to `True`
+                        then keys will be unicode in all cases. Otherwise,
+                        they remain `str` if they fit into ASCII.
+    :param include_empty: Set to `False` if you don't want empty values to
+                          appear in the dict.
+    :param errors: the decoding error behavior.
+    :param separator: the pair separator to be used, defaults to ``&``
+    :param cls: an optional dict class to use.  If this is not specified
+                       or `None` the default :class:`MultiDict` is used.
+    """
+    if cls is None:
+        cls = MultiDict
+    if isinstance(s, text_type) and not isinstance(separator, text_type):
+        separator = separator.decode(charset or "ascii")
+    elif isinstance(s, bytes) and not isinstance(separator, bytes):
+        separator = separator.encode(charset or "ascii")
+    return cls(
+        _url_decode_impl(
+            s.split(separator), charset, decode_keys, include_empty, errors
+        )
+    )
+
+
+def url_decode_stream(
+    stream,
+    charset="utf-8",
+    decode_keys=False,
+    include_empty=True,
+    errors="replace",
+    separator="&",
+    cls=None,
+    limit=None,
+    return_iterator=False,
+):
+    """Works like :func:`url_decode` but decodes a stream.  The behavior
+    of stream and limit follows functions like
+    :func:`~werkzeug.wsgi.make_line_iter`.  The generator of pairs is
+    directly fed to the `cls` so you can consume the data while it's
+    parsed.
+
+    .. versionadded:: 0.8
+
+    :param stream: a stream with the encoded querystring
+    :param charset: the charset of the query string.  If set to `None`
+                    no unicode decoding will take place.
+    :param decode_keys: Used on Python 2.x to control whether keys should
+                        be forced to be unicode objects.  If set to `True`,
+                        keys will be unicode in all cases. Otherwise, they
+                        remain `str` if they fit into ASCII.
+    :param include_empty: Set to `False` if you don't want empty values to
+                          appear in the dict.
+    :param errors: the decoding error behavior.
+    :param separator: the pair separator to be used, defaults to ``&``
+    :param cls: an optional dict class to use.  If this is not specified
+                       or `None` the default :class:`MultiDict` is used.
+    :param limit: the content length of the URL data.  Not necessary if
+                  a limited stream is provided.
+    :param return_iterator: if set to `True` the `cls` argument is ignored
+                            and an iterator over all decoded pairs is
+                            returned
+    """
+    from .wsgi import make_chunk_iter
+
+    pair_iter = make_chunk_iter(stream, separator, limit)
+    decoder = _url_decode_impl(pair_iter, charset, decode_keys, include_empty, errors)
+
+    if return_iterator:
+        return decoder
+
+    if cls is None:
+        cls = MultiDict
+
+    return cls(decoder)
+
+
+def _url_decode_impl(pair_iter, charset, decode_keys, include_empty, errors):
+    for pair in pair_iter:
+        if not pair:
+            continue
+        s = make_literal_wrapper(pair)
+        equal = s("=")
+        if equal in pair:
+            key, value = pair.split(equal, 1)
+        else:
+            if not include_empty:
+                continue
+            key = pair
+            value = s("")
+        key = url_unquote_plus(key, charset, errors)
+        if charset is not None and PY2 and not decode_keys:
+            key = try_coerce_native(key)
+        yield key, url_unquote_plus(value, charset, errors)
+
+
+def url_encode(
+    obj, charset="utf-8", encode_keys=False, sort=False, key=None, separator=b"&"
+):
+    """URL encode a dict/`MultiDict`.  If a value is `None` it will not appear
+    in the result string.  Per default only values are encoded into the target
+    charset strings.  If `encode_keys` is set to ``True`` unicode keys are
+    supported too.
+
+    If `sort` is set to `True` the items are sorted by `key` or the default
+    sorting algorithm.
+
+    .. versionadded:: 0.5
+        `sort`, `key`, and `separator` were added.
+
+    :param obj: the object to encode into a query string.
+    :param charset: the charset of the query string.
+    :param encode_keys: set to `True` if you have unicode keys. (Ignored on
+                        Python 3.x)
+    :param sort: set to `True` if you want parameters to be sorted by `key`.
+    :param separator: the separator to be used for the pairs.
+    :param key: an optional function to be used for sorting.  For more details
+                check out the :func:`sorted` documentation.
+    """
+    separator = to_native(separator, "ascii")
+    return separator.join(_url_encode_impl(obj, charset, encode_keys, sort, key))
+
+
+def url_encode_stream(
+    obj,
+    stream=None,
+    charset="utf-8",
+    encode_keys=False,
+    sort=False,
+    key=None,
+    separator=b"&",
+):
+    """Like :meth:`url_encode` but writes the results to a stream
+    object.  If the stream is `None` a generator over all encoded
+    pairs is returned.
+
+    .. versionadded:: 0.8
+
+    :param obj: the object to encode into a query string.
+    :param stream: a stream to write the encoded object into or `None` if
+                   an iterator over the encoded pairs should be returned.  In
+                   that case the separator argument is ignored.
+    :param charset: the charset of the query string.
+    :param encode_keys: set to `True` if you have unicode keys. (Ignored on
+                        Python 3.x)
+    :param sort: set to `True` if you want parameters to be sorted by `key`.
+    :param separator: the separator to be used for the pairs.
+    :param key: an optional function to be used for sorting.  For more details
+                check out the :func:`sorted` documentation.
+    """
+    separator = to_native(separator, "ascii")
+    gen = _url_encode_impl(obj, charset, encode_keys, sort, key)
+    if stream is None:
+        return gen
+    for idx, chunk in enumerate(gen):
+        if idx:
+            stream.write(separator)
+        stream.write(chunk)
+
+
+def url_join(base, url, allow_fragments=True):
+    """Join a base URL and a possibly relative URL to form an absolute
+    interpretation of the latter.
+
+    :param base: the base URL for the join operation.
+    :param url: the URL to join.
+    :param allow_fragments: indicates whether fragments should be allowed.
+    """
+    if isinstance(base, tuple):
+        base = url_unparse(base)
+    if isinstance(url, tuple):
+        url = url_unparse(url)
+
+    base, url = normalize_string_tuple((base, url))
+    s = make_literal_wrapper(base)
+
+    if not base:
+        return url
+    if not url:
+        return base
+
+    bscheme, bnetloc, bpath, bquery, bfragment = url_parse(
+        base, allow_fragments=allow_fragments
+    )
+    scheme, netloc, path, query, fragment = url_parse(url, bscheme, allow_fragments)
+    if scheme != bscheme:
+        return url
+    if netloc:
+        return url_unparse((scheme, netloc, path, query, fragment))
+    netloc = bnetloc
+
+    if path[:1] == s("/"):
+        segments = path.split(s("/"))
+    elif not path:
+        segments = bpath.split(s("/"))
+        if not query:
+            query = bquery
+    else:
+        segments = bpath.split(s("/"))[:-1] + path.split(s("/"))
+
+    # If the rightmost part is "./" we want to keep the slash but
+    # remove the dot.
+    if segments[-1] == s("."):
+        segments[-1] = s("")
+
+    # Resolve ".." and "."
+    segments = [segment for segment in segments if segment != s(".")]
+    while 1:
+        i = 1
+        n = len(segments) - 1
+        while i < n:
+            if segments[i] == s("..") and segments[i - 1] not in (s(""), s("..")):
+                del segments[i - 1 : i + 1]
+                break
+            i += 1
+        else:
+            break
+
+    # Remove trailing ".." if the URL is absolute
+    unwanted_marker = [s(""), s("..")]
+    while segments[:2] == unwanted_marker:
+        del segments[1]
+
+    path = s("/").join(segments)
+    return url_unparse((scheme, netloc, path, query, fragment))
+
+
+class Href(object):
+    """Implements a callable that constructs URLs with the given base. The
+    function can be called with any number of positional and keyword
+    arguments which than are used to assemble the URL.  Works with URLs
+    and posix paths.
+
+    Positional arguments are appended as individual segments to
+    the path of the URL:
+
+    >>> href = Href('/foo')
+    >>> href('bar', 23)
+    '/foo/bar/23'
+    >>> href('foo', bar=23)
+    '/foo/foo?bar=23'
+
+    If any of the arguments (positional or keyword) evaluates to `None` it
+    will be skipped.  If no keyword arguments are given the last argument
+    can be a :class:`dict` or :class:`MultiDict` (or any other dict subclass),
+    otherwise the keyword arguments are used for the query parameters, cutting
+    off the first trailing underscore of the parameter name:
+
+    >>> href(is_=42)
+    '/foo?is=42'
+    >>> href({'foo': 'bar'})
+    '/foo?foo=bar'
+
+    Combining of both methods is not allowed:
+
+    >>> href({'foo': 'bar'}, bar=42)
+    Traceback (most recent call last):
+      ...
+    TypeError: keyword arguments and query-dicts can't be combined
+
+    Accessing attributes on the href object creates a new href object with
+    the attribute name as prefix:
+
+    >>> bar_href = href.bar
+    >>> bar_href("blub")
+    '/foo/bar/blub'
+
+    If `sort` is set to `True` the items are sorted by `key` or the default
+    sorting algorithm:
+
+    >>> href = Href("/", sort=True)
+    >>> href(a=1, b=2, c=3)
+    '/?a=1&b=2&c=3'
+
+    .. versionadded:: 0.5
+        `sort` and `key` were added.
+    """
+
+    def __init__(self, base="./", charset="utf-8", sort=False, key=None):
+        if not base:
+            base = "./"
+        self.base = base
+        self.charset = charset
+        self.sort = sort
+        self.key = key
+
+    def __getattr__(self, name):
+        if name[:2] == "__":
+            raise AttributeError(name)
+        base = self.base
+        if base[-1:] != "/":
+            base += "/"
+        return Href(url_join(base, name), self.charset, self.sort, self.key)
+
+    def __call__(self, *path, **query):
+        if path and isinstance(path[-1], dict):
+            if query:
+                raise TypeError("keyword arguments and query-dicts can't be combined")
+            query, path = path[-1], path[:-1]
+        elif query:
+            query = dict(
+                [(k.endswith("_") and k[:-1] or k, v) for k, v in query.items()]
+            )
+        path = "/".join(
+            [
+                to_unicode(url_quote(x, self.charset), "ascii")
+                for x in path
+                if x is not None
+            ]
+        ).lstrip("/")
+        rv = self.base
+        if path:
+            if not rv.endswith("/"):
+                rv += "/"
+            rv = url_join(rv, "./" + path)
+        if query:
+            rv += "?" + to_unicode(
+                url_encode(query, self.charset, sort=self.sort, key=self.key), "ascii"
+            )
+        return to_native(rv)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/useragents.py b/venv/lib/python3.7/site-packages/werkzeug/useragents.py
new file mode 100644
index 0000000..e265e09
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/useragents.py
@@ -0,0 +1,220 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.useragents
+    ~~~~~~~~~~~~~~~~~~~
+
+    This module provides a helper to inspect user agent strings.  This module
+    is far from complete but should work for most of the currently available
+    browsers.
+
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import re
+import warnings
+
+
+class UserAgentParser(object):
+    """A simple user agent parser.  Used by the `UserAgent`."""
+
+    platforms = (
+        ("cros", "chromeos"),
+        ("iphone|ios", "iphone"),
+        ("ipad", "ipad"),
+        (r"darwin|mac|os\s*x", "macos"),
+        ("win", "windows"),
+        (r"android", "android"),
+        ("netbsd", "netbsd"),
+        ("openbsd", "openbsd"),
+        ("freebsd", "freebsd"),
+        ("dragonfly", "dragonflybsd"),
+        ("(sun|i86)os", "solaris"),
+        (r"x11|lin(\b|ux)?", "linux"),
+        (r"nintendo\s+wii", "wii"),
+        ("irix", "irix"),
+        ("hp-?ux", "hpux"),
+        ("aix", "aix"),
+        ("sco|unix_sv", "sco"),
+        ("bsd", "bsd"),
+        ("amiga", "amiga"),
+        ("blackberry|playbook", "blackberry"),
+        ("symbian", "symbian"),
+    )
+    browsers = (
+        ("googlebot", "google"),
+        ("msnbot", "msn"),
+        ("yahoo", "yahoo"),
+        ("ask jeeves", "ask"),
+        (r"aol|america\s+online\s+browser", "aol"),
+        ("opera", "opera"),
+        ("edge", "edge"),
+        ("chrome|crios", "chrome"),
+        ("seamonkey", "seamonkey"),
+        ("firefox|firebird|phoenix|iceweasel", "firefox"),
+        ("galeon", "galeon"),
+        ("safari|version", "safari"),
+        ("webkit", "webkit"),
+        ("camino", "camino"),
+        ("konqueror", "konqueror"),
+        ("k-meleon", "kmeleon"),
+        ("netscape", "netscape"),
+        (r"msie|microsoft\s+internet\s+explorer|trident/.+? rv:", "msie"),
+        ("lynx", "lynx"),
+        ("links", "links"),
+        ("Baiduspider", "baidu"),
+        ("bingbot", "bing"),
+        ("mozilla", "mozilla"),
+    )
+
+    _browser_version_re = r"(?:%s)[/\sa-z(]*(\d+[.\da-z]+)?"
+    _language_re = re.compile(
+        r"(?:;\s*|\s+)(\b\w{2}\b(?:-\b\w{2}\b)?)\s*;|"
+        r"(?:\(|\[|;)\s*(\b\w{2}\b(?:-\b\w{2}\b)?)\s*(?:\]|\)|;)"
+    )
+
+    def __init__(self):
+        self.platforms = [(b, re.compile(a, re.I)) for a, b in self.platforms]
+        self.browsers = [
+            (b, re.compile(self._browser_version_re % a, re.I))
+            for a, b in self.browsers
+        ]
+
+    def __call__(self, user_agent):
+        for platform, regex in self.platforms:  # noqa: B007
+            match = regex.search(user_agent)
+            if match is not None:
+                break
+        else:
+            platform = None
+        for browser, regex in self.browsers:  # noqa: B007
+            match = regex.search(user_agent)
+            if match is not None:
+                version = match.group(1)
+                break
+        else:
+            browser = version = None
+        match = self._language_re.search(user_agent)
+        if match is not None:
+            language = match.group(1) or match.group(2)
+        else:
+            language = None
+        return platform, browser, version, language
+
+
+class UserAgent(object):
+    """Represents a user agent.  Pass it a WSGI environment or a user agent
+    string and you can inspect some of the details from the user agent
+    string via the attributes.  The following attributes exist:
+
+    .. attribute:: string
+
+       the raw user agent string
+
+    .. attribute:: platform
+
+       the browser platform.  The following platforms are currently
+       recognized:
+
+       -   `aix`
+       -   `amiga`
+       -   `android`
+       -   `blackberry`
+       -   `bsd`
+       -   `chromeos`
+       -   `dragonflybsd`
+       -   `freebsd`
+       -   `hpux`
+       -   `ipad`
+       -   `iphone`
+       -   `irix`
+       -   `linux`
+       -   `macos`
+       -   `netbsd`
+       -   `openbsd`
+       -   `sco`
+       -   `solaris`
+       -   `symbian`
+       -   `wii`
+       -   `windows`
+
+    .. attribute:: browser
+
+        the name of the browser.  The following browsers are currently
+        recognized:
+
+        -   `aol` *
+        -   `ask` *
+        -   `baidu` *
+        -   `bing` *
+        -   `camino`
+        -   `chrome`
+        -   `edge`
+        -   `firefox`
+        -   `galeon`
+        -   `google` *
+        -   `kmeleon`
+        -   `konqueror`
+        -   `links`
+        -   `lynx`
+        -   `mozilla`
+        -   `msie`
+        -   `msn`
+        -   `netscape`
+        -   `opera`
+        -   `safari`
+        -   `seamonkey`
+        -   `webkit`
+        -   `yahoo` *
+
+        (Browsers marked with a star (``*``) are crawlers.)
+
+    .. attribute:: version
+
+        the version of the browser
+
+    .. attribute:: language
+
+        the language of the browser
+    """
+
+    _parser = UserAgentParser()
+
+    def __init__(self, environ_or_string):
+        if isinstance(environ_or_string, dict):
+            environ_or_string = environ_or_string.get("HTTP_USER_AGENT", "")
+        self.string = environ_or_string
+        self.platform, self.browser, self.version, self.language = self._parser(
+            environ_or_string
+        )
+
+    def to_header(self):
+        return self.string
+
+    def __str__(self):
+        return self.string
+
+    def __nonzero__(self):
+        return bool(self.browser)
+
+    __bool__ = __nonzero__
+
+    def __repr__(self):
+        return "<%s %r/%s>" % (self.__class__.__name__, self.browser, self.version)
+
+
+# DEPRECATED
+from .wrappers import UserAgentMixin as _UserAgentMixin
+
+
+class UserAgentMixin(_UserAgentMixin):
+    @property
+    def user_agent(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.useragents.UserAgentMixin' should be imported"
+            " from 'werkzeug.wrappers.UserAgentMixin'. This old import"
+            " will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return super(_UserAgentMixin, self).user_agent
diff --git a/venv/lib/python3.7/site-packages/werkzeug/utils.py b/venv/lib/python3.7/site-packages/werkzeug/utils.py
new file mode 100644
index 0000000..2062057
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/utils.py
@@ -0,0 +1,836 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.utils
+    ~~~~~~~~~~~~~~
+
+    This module implements various utilities for WSGI applications.  Most of
+    them are used by the request and response wrappers but especially for
+    middleware development it makes sense to use them without the wrappers.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import codecs
+import os
+import pkgutil
+import re
+import sys
+import warnings
+
+from ._compat import iteritems
+from ._compat import PY2
+from ._compat import reraise
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import unichr
+from ._internal import _DictAccessorProperty
+from ._internal import _missing
+from ._internal import _parse_signature
+
+try:
+    from html.entities import name2codepoint
+except ImportError:
+    from htmlentitydefs import name2codepoint
+
+
+_format_re = re.compile(r"\$(?:(%s)|\{(%s)\})" % (("[a-zA-Z_][a-zA-Z0-9_]*",) * 2))
+_entity_re = re.compile(r"&([^;]+);")
+_filename_ascii_strip_re = re.compile(r"[^A-Za-z0-9_.-]")
+_windows_device_files = (
+    "CON",
+    "AUX",
+    "COM1",
+    "COM2",
+    "COM3",
+    "COM4",
+    "LPT1",
+    "LPT2",
+    "LPT3",
+    "PRN",
+    "NUL",
+)
+
+
+class cached_property(property):
+    """A decorator that converts a function into a lazy property.  The
+    function wrapped is called the first time to retrieve the result
+    and then that calculated result is used the next time you access
+    the value::
+
+        class Foo(object):
+
+            @cached_property
+            def foo(self):
+                # calculate something important here
+                return 42
+
+    The class has to have a `__dict__` in order for this property to
+    work.
+    """
+
+    # implementation detail: A subclass of python's builtin property
+    # decorator, we override __get__ to check for a cached value. If one
+    # chooses to invoke __get__ by hand the property will still work as
+    # expected because the lookup logic is replicated in __get__ for
+    # manual invocation.
+
+    def __init__(self, func, name=None, doc=None):
+        self.__name__ = name or func.__name__
+        self.__module__ = func.__module__
+        self.__doc__ = doc or func.__doc__
+        self.func = func
+
+    def __set__(self, obj, value):
+        obj.__dict__[self.__name__] = value
+
+    def __get__(self, obj, type=None):
+        if obj is None:
+            return self
+        value = obj.__dict__.get(self.__name__, _missing)
+        if value is _missing:
+            value = self.func(obj)
+            obj.__dict__[self.__name__] = value
+        return value
+
+
+class environ_property(_DictAccessorProperty):
+    """Maps request attributes to environment variables. This works not only
+    for the Werzeug request object, but also any other class with an
+    environ attribute:
+
+    >>> class Test(object):
+    ...     environ = {'key': 'value'}
+    ...     test = environ_property('key')
+    >>> var = Test()
+    >>> var.test
+    'value'
+
+    If you pass it a second value it's used as default if the key does not
+    exist, the third one can be a converter that takes a value and converts
+    it.  If it raises :exc:`ValueError` or :exc:`TypeError` the default value
+    is used. If no default value is provided `None` is used.
+
+    Per default the property is read only.  You have to explicitly enable it
+    by passing ``read_only=False`` to the constructor.
+    """
+
+    read_only = True
+
+    def lookup(self, obj):
+        return obj.environ
+
+
+class header_property(_DictAccessorProperty):
+    """Like `environ_property` but for headers."""
+
+    def lookup(self, obj):
+        return obj.headers
+
+
+class HTMLBuilder(object):
+    """Helper object for HTML generation.
+
+    Per default there are two instances of that class.  The `html` one, and
+    the `xhtml` one for those two dialects.  The class uses keyword parameters
+    and positional parameters to generate small snippets of HTML.
+
+    Keyword parameters are converted to XML/SGML attributes, positional
+    arguments are used as children.  Because Python accepts positional
+    arguments before keyword arguments it's a good idea to use a list with the
+    star-syntax for some children:
+
+    >>> html.p(class_='foo', *[html.a('foo', href='foo.html'), ' ',
+    ...                        html.a('bar', href='bar.html')])
+    u'
    foo bar
    '
+
+    This class works around some browser limitations and can not be used for
+    arbitrary SGML/XML generation.  For that purpose lxml and similar
+    libraries exist.
+
+    Calling the builder escapes the string passed:
+
+    >>> html.p(html(""))
+    u'
    <foo>
    '
+    """
+
+    _entity_re = re.compile(r"&([^;]+);")
+    _entities = name2codepoint.copy()
+    _entities["apos"] = 39
+    _empty_elements = {
+        "area",
+        "base",
+        "basefont",
+        "br",
+        "col",
+        "command",
+        "embed",
+        "frame",
+        "hr",
+        "img",
+        "input",
+        "keygen",
+        "isindex",
+        "link",
+        "meta",
+        "param",
+        "source",
+        "wbr",
+    }
+    _boolean_attributes = {
+        "selected",
+        "checked",
+        "compact",
+        "declare",
+        "defer",
+        "disabled",
+        "ismap",
+        "multiple",
+        "nohref",
+        "noresize",
+        "noshade",
+        "nowrap",
+    }
+    _plaintext_elements = {"textarea"}
+    _c_like_cdata = {"script", "style"}
+
+    def __init__(self, dialect):
+        self._dialect = dialect
+
+    def __call__(self, s):
+        return escape(s)
+
+    def __getattr__(self, tag):
+        if tag[:2] == "__":
+            raise AttributeError(tag)
+
+        def proxy(*children, **arguments):
+            buffer = "<" + tag
+            for key, value in iteritems(arguments):
+                if value is None:
+                    continue
+                if key[-1] == "_":
+                    key = key[:-1]
+                if key in self._boolean_attributes:
+                    if not value:
+                        continue
+                    if self._dialect == "xhtml":
+                        value = '="' + key + '"'
+                    else:
+                        value = ""
+                else:
+                    value = '="' + escape(value) + '"'
+                buffer += " " + key + value
+            if not children and tag in self._empty_elements:
+                if self._dialect == "xhtml":
+                    buffer += " />"
+                else:
+                    buffer += ">"
+                return buffer
+            buffer += ">"
+
+            children_as_string = "".join(
+                [text_type(x) for x in children if x is not None]
+            )
+
+            if children_as_string:
+                if tag in self._plaintext_elements:
+                    children_as_string = escape(children_as_string)
+                elif tag in self._c_like_cdata and self._dialect == "xhtml":
+                    children_as_string = (
+                        "/**/"
+                    )
+            buffer += children_as_string + ""
+            return buffer
+
+        return proxy
+
+    def __repr__(self):
+        return "<%s for %r>" % (self.__class__.__name__, self._dialect)
+
+
+html = HTMLBuilder("html")
+xhtml = HTMLBuilder("xhtml")
+
+# https://cgit.freedesktop.org/xdg/shared-mime-info/tree/freedesktop.org.xml.in
+# https://www.iana.org/assignments/media-types/media-types.xhtml
+# Types listed in the XDG mime info that have a charset in the IANA registration.
+_charset_mimetypes = {
+    "application/ecmascript",
+    "application/javascript",
+    "application/sql",
+    "application/xml",
+    "application/xml-dtd",
+    "application/xml-external-parsed-entity",
+}
+
+
+def get_content_type(mimetype, charset):
+    """Returns the full content type string with charset for a mimetype.
+
+    If the mimetype represents text, the charset parameter will be
+    appended, otherwise the mimetype is returned unchanged.
+
+    :param mimetype: The mimetype to be used as content type.
+    :param charset: The charset to be appended for text mimetypes.
+    :return: The content type.
+
+    .. verionchanged:: 0.15
+        Any type that ends with ``+xml`` gets a charset, not just those
+        that start with ``application/``. Known text types such as
+        ``application/javascript`` are also given charsets.
+    """
+    if (
+        mimetype.startswith("text/")
+        or mimetype in _charset_mimetypes
+        or mimetype.endswith("+xml")
+    ):
+        mimetype += "; charset=" + charset
+
+    return mimetype
+
+
+def detect_utf_encoding(data):
+    """Detect which UTF encoding was used to encode the given bytes.
+
+    The latest JSON standard (:rfc:`8259`) suggests that only UTF-8 is
+    accepted. Older documents allowed 8, 16, or 32. 16 and 32 can be big
+    or little endian. Some editors or libraries may prepend a BOM.
+
+    :internal:
+
+    :param data: Bytes in unknown UTF encoding.
+    :return: UTF encoding name
+
+    .. versionadded:: 0.15
+    """
+    head = data[:4]
+
+    if head[:3] == codecs.BOM_UTF8:
+        return "utf-8-sig"
+
+    if b"\x00" not in head:
+        return "utf-8"
+
+    if head in (codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE):
+        return "utf-32"
+
+    if head[:2] in (codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE):
+        return "utf-16"
+
+    if len(head) == 4:
+        if head[:3] == b"\x00\x00\x00":
+            return "utf-32-be"
+
+        if head[::2] == b"\x00\x00":
+            return "utf-16-be"
+
+        if head[1:] == b"\x00\x00\x00":
+            return "utf-32-le"
+
+        if head[1::2] == b"\x00\x00":
+            return "utf-16-le"
+
+    if len(head) == 2:
+        return "utf-16-be" if head.startswith(b"\x00") else "utf-16-le"
+
+    return "utf-8"
+
+
+def format_string(string, context):
+    """String-template format a string:
+
+    >>> format_string('$foo and ${foo}s', dict(foo=42))
+    '42 and 42s'
+
+    This does not do any attribute lookup etc.  For more advanced string
+    formattings have a look at the `werkzeug.template` module.
+
+    :param string: the format string.
+    :param context: a dict with the variables to insert.
+    """
+
+    def lookup_arg(match):
+        x = context[match.group(1) or match.group(2)]
+        if not isinstance(x, string_types):
+            x = type(string)(x)
+        return x
+
+    return _format_re.sub(lookup_arg, string)
+
+
+def secure_filename(filename):
+    r"""Pass it a filename and it will return a secure version of it.  This
+    filename can then safely be stored on a regular file system and passed
+    to :func:`os.path.join`.  The filename returned is an ASCII only string
+    for maximum portability.
+
+    On windows systems the function also makes sure that the file is not
+    named after one of the special device files.
+
+    >>> secure_filename("My cool movie.mov")
+    'My_cool_movie.mov'
+    >>> secure_filename("../../../etc/passwd")
+    'etc_passwd'
+    >>> secure_filename(u'i contain cool \xfcml\xe4uts.txt')
+    'i_contain_cool_umlauts.txt'
+
+    The function might return an empty filename.  It's your responsibility
+    to ensure that the filename is unique and that you abort or
+    generate a random filename if the function returned an empty one.
+
+    .. versionadded:: 0.5
+
+    :param filename: the filename to secure
+    """
+    if isinstance(filename, text_type):
+        from unicodedata import normalize
+
+        filename = normalize("NFKD", filename).encode("ascii", "ignore")
+        if not PY2:
+            filename = filename.decode("ascii")
+    for sep in os.path.sep, os.path.altsep:
+        if sep:
+            filename = filename.replace(sep, " ")
+    filename = str(_filename_ascii_strip_re.sub("", "_".join(filename.split()))).strip(
+        "._"
+    )
+
+    # on nt a couple of special files are present in each folder.  We
+    # have to ensure that the target file is not such a filename.  In
+    # this case we prepend an underline
+    if (
+        os.name == "nt"
+        and filename
+        and filename.split(".")[0].upper() in _windows_device_files
+    ):
+        filename = "_" + filename
+
+    return filename
+
+
+def escape(s, quote=None):
+    """Replace special characters "&", "<", ">" and (") to HTML-safe sequences.
+
+    There is a special handling for `None` which escapes to an empty string.
+
+    .. versionchanged:: 0.9
+       `quote` is now implicitly on.
+
+    :param s: the string to escape.
+    :param quote: ignored.
+    """
+    if s is None:
+        return ""
+    elif hasattr(s, "__html__"):
+        return text_type(s.__html__())
+    elif not isinstance(s, string_types):
+        s = text_type(s)
+    if quote is not None:
+        from warnings import warn
+
+        warn(
+            "The 'quote' parameter is no longer used as of version 0.9"
+            " and will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+    s = (
+        s.replace("&", "&")
+        .replace("<", "<")
+        .replace(">", ">")
+        .replace('"', """)
+    )
+    return s
+
+
+def unescape(s):
+    """The reverse function of `escape`.  This unescapes all the HTML
+    entities, not only the XML entities inserted by `escape`.
+
+    :param s: the string to unescape.
+    """
+
+    def handle_match(m):
+        name = m.group(1)
+        if name in HTMLBuilder._entities:
+            return unichr(HTMLBuilder._entities[name])
+        try:
+            if name[:2] in ("#x", "#X"):
+                return unichr(int(name[2:], 16))
+            elif name.startswith("#"):
+                return unichr(int(name[1:]))
+        except ValueError:
+            pass
+        return u""
+
+    return _entity_re.sub(handle_match, s)
+
+
+def redirect(location, code=302, Response=None):
+    """Returns a response object (a WSGI application) that, if called,
+    redirects the client to the target location. Supported codes are
+    301, 302, 303, 305, 307, and 308. 300 is not supported because
+    it's not a real redirect and 304 because it's the answer for a
+    request with a request with defined If-Modified-Since headers.
+
+    .. versionadded:: 0.6
+       The location can now be a unicode string that is encoded using
+       the :func:`iri_to_uri` function.
+
+    .. versionadded:: 0.10
+        The class used for the Response object can now be passed in.
+
+    :param location: the location the response should redirect to.
+    :param code: the redirect status code. defaults to 302.
+    :param class Response: a Response class to use when instantiating a
+        response. The default is :class:`werkzeug.wrappers.Response` if
+        unspecified.
+    """
+    if Response is None:
+        from .wrappers import Response
+
+    display_location = escape(location)
+    if isinstance(location, text_type):
+        # Safe conversion is necessary here as we might redirect
+        # to a broken URI scheme (for instance itms-services).
+        from .urls import iri_to_uri
+
+        location = iri_to_uri(location, safe_conversion=True)
+    response = Response(
+        '\n'
+        "Redirecting...\n"
+        "
    Redirecting...
    \n"
+        "
    You should be redirected automatically to target URL: "
+        '%s.  If not click the link.'
+        % (escape(location), display_location),
+        code,
+        mimetype="text/html",
+    )
+    response.headers["Location"] = location
+    return response
+
+
+def append_slash_redirect(environ, code=301):
+    """Redirects to the same URL but with a slash appended.  The behavior
+    of this function is undefined if the path ends with a slash already.
+
+    :param environ: the WSGI environment for the request that triggers
+                    the redirect.
+    :param code: the status code for the redirect.
+    """
+    new_path = environ["PATH_INFO"].strip("/") + "/"
+    query_string = environ.get("QUERY_STRING")
+    if query_string:
+        new_path += "?" + query_string
+    return redirect(new_path, code)
+
+
+def import_string(import_name, silent=False):
+    """Imports an object based on a string.  This is useful if you want to
+    use import paths as endpoints or something similar.  An import path can
+    be specified either in dotted notation (``xml.sax.saxutils.escape``)
+    or with a colon as object delimiter (``xml.sax.saxutils:escape``).
+
+    If `silent` is True the return value will be `None` if the import fails.
+
+    :param import_name: the dotted name for the object to import.
+    :param silent: if set to `True` import errors are ignored and
+                   `None` is returned instead.
+    :return: imported object
+    """
+    # force the import name to automatically convert to strings
+    # __import__ is not able to handle unicode strings in the fromlist
+    # if the module is a package
+    import_name = str(import_name).replace(":", ".")
+    try:
+        try:
+            __import__(import_name)
+        except ImportError:
+            if "." not in import_name:
+                raise
+        else:
+            return sys.modules[import_name]
+
+        module_name, obj_name = import_name.rsplit(".", 1)
+        module = __import__(module_name, globals(), locals(), [obj_name])
+        try:
+            return getattr(module, obj_name)
+        except AttributeError as e:
+            raise ImportError(e)
+
+    except ImportError as e:
+        if not silent:
+            reraise(
+                ImportStringError, ImportStringError(import_name, e), sys.exc_info()[2]
+            )
+
+
+def find_modules(import_path, include_packages=False, recursive=False):
+    """Finds all the modules below a package.  This can be useful to
+    automatically import all views / controllers so that their metaclasses /
+    function decorators have a chance to register themselves on the
+    application.
+
+    Packages are not returned unless `include_packages` is `True`.  This can
+    also recursively list modules but in that case it will import all the
+    packages to get the correct load path of that module.
+
+    :param import_path: the dotted name for the package to find child modules.
+    :param include_packages: set to `True` if packages should be returned, too.
+    :param recursive: set to `True` if recursion should happen.
+    :return: generator
+    """
+    module = import_string(import_path)
+    path = getattr(module, "__path__", None)
+    if path is None:
+        raise ValueError("%r is not a package" % import_path)
+    basename = module.__name__ + "."
+    for _importer, modname, ispkg in pkgutil.iter_modules(path):
+        modname = basename + modname
+        if ispkg:
+            if include_packages:
+                yield modname
+            if recursive:
+                for item in find_modules(modname, include_packages, True):
+                    yield item
+        else:
+            yield modname
+
+
+def validate_arguments(func, args, kwargs, drop_extra=True):
+    """Checks if the function accepts the arguments and keyword arguments.
+    Returns a new ``(args, kwargs)`` tuple that can safely be passed to
+    the function without causing a `TypeError` because the function signature
+    is incompatible.  If `drop_extra` is set to `True` (which is the default)
+    any extra positional or keyword arguments are dropped automatically.
+
+    The exception raised provides three attributes:
+
+    `missing`
+        A set of argument names that the function expected but where
+        missing.
+
+    `extra`
+        A dict of keyword arguments that the function can not handle but
+        where provided.
+
+    `extra_positional`
+        A list of values that where given by positional argument but the
+        function cannot accept.
+
+    This can be useful for decorators that forward user submitted data to
+    a view function::
+
+        from werkzeug.utils import ArgumentValidationError, validate_arguments
+
+        def sanitize(f):
+            def proxy(request):
+                data = request.values.to_dict()
+                try:
+                    args, kwargs = validate_arguments(f, (request,), data)
+                except ArgumentValidationError:
+                    raise BadRequest('The browser failed to transmit all '
+                                     'the data expected.')
+                return f(*args, **kwargs)
+            return proxy
+
+    :param func: the function the validation is performed against.
+    :param args: a tuple of positional arguments.
+    :param kwargs: a dict of keyword arguments.
+    :param drop_extra: set to `False` if you don't want extra arguments
+                       to be silently dropped.
+    :return: tuple in the form ``(args, kwargs)``.
+    """
+    parser = _parse_signature(func)
+    args, kwargs, missing, extra, extra_positional = parser(args, kwargs)[:5]
+    if missing:
+        raise ArgumentValidationError(tuple(missing))
+    elif (extra or extra_positional) and not drop_extra:
+        raise ArgumentValidationError(None, extra, extra_positional)
+    return tuple(args), kwargs
+
+
+def bind_arguments(func, args, kwargs):
+    """Bind the arguments provided into a dict.  When passed a function,
+    a tuple of arguments and a dict of keyword arguments `bind_arguments`
+    returns a dict of names as the function would see it.  This can be useful
+    to implement a cache decorator that uses the function arguments to build
+    the cache key based on the values of the arguments.
+
+    :param func: the function the arguments should be bound for.
+    :param args: tuple of positional arguments.
+    :param kwargs: a dict of keyword arguments.
+    :return: a :class:`dict` of bound keyword arguments.
+    """
+    (
+        args,
+        kwargs,
+        missing,
+        extra,
+        extra_positional,
+        arg_spec,
+        vararg_var,
+        kwarg_var,
+    ) = _parse_signature(func)(args, kwargs)
+    values = {}
+    for (name, _has_default, _default), value in zip(arg_spec, args):
+        values[name] = value
+    if vararg_var is not None:
+        values[vararg_var] = tuple(extra_positional)
+    elif extra_positional:
+        raise TypeError("too many positional arguments")
+    if kwarg_var is not None:
+        multikw = set(extra) & set([x[0] for x in arg_spec])
+        if multikw:
+            raise TypeError(
+                "got multiple values for keyword argument " + repr(next(iter(multikw)))
+            )
+        values[kwarg_var] = extra
+    elif extra:
+        raise TypeError("got unexpected keyword argument " + repr(next(iter(extra))))
+    return values
+
+
+class ArgumentValidationError(ValueError):
+
+    """Raised if :func:`validate_arguments` fails to validate"""
+
+    def __init__(self, missing=None, extra=None, extra_positional=None):
+        self.missing = set(missing or ())
+        self.extra = extra or {}
+        self.extra_positional = extra_positional or []
+        ValueError.__init__(
+            self,
+            "function arguments invalid. (%d missing, %d additional)"
+            % (len(self.missing), len(self.extra) + len(self.extra_positional)),
+        )
+
+
+class ImportStringError(ImportError):
+    """Provides information about a failed :func:`import_string` attempt."""
+
+    #: String in dotted notation that failed to be imported.
+    import_name = None
+    #: Wrapped exception.
+    exception = None
+
+    def __init__(self, import_name, exception):
+        self.import_name = import_name
+        self.exception = exception
+
+        msg = (
+            "import_string() failed for %r. Possible reasons are:\n\n"
+            "- missing __init__.py in a package;\n"
+            "- package or module path not included in sys.path;\n"
+            "- duplicated package or module name taking precedence in "
+            "sys.path;\n"
+            "- missing module, class, function or variable;\n\n"
+            "Debugged import:\n\n%s\n\n"
+            "Original exception:\n\n%s: %s"
+        )
+
+        name = ""
+        tracked = []
+        for part in import_name.replace(":", ".").split("."):
+            name += (name and ".") + part
+            imported = import_string(name, silent=True)
+            if imported:
+                tracked.append((name, getattr(imported, "__file__", None)))
+            else:
+                track = ["- %r found in %r." % (n, i) for n, i in tracked]
+                track.append("- %r not found." % name)
+                msg = msg % (
+                    import_name,
+                    "\n".join(track),
+                    exception.__class__.__name__,
+                    str(exception),
+                )
+                break
+
+        ImportError.__init__(self, msg)
+
+    def __repr__(self):
+        return "<%s(%r, %r)>" % (
+            self.__class__.__name__,
+            self.import_name,
+            self.exception,
+        )
+
+
+# DEPRECATED
+from .datastructures import CombinedMultiDict as _CombinedMultiDict
+from .datastructures import EnvironHeaders as _EnvironHeaders
+from .datastructures import Headers as _Headers
+from .datastructures import MultiDict as _MultiDict
+from .http import dump_cookie as _dump_cookie
+from .http import parse_cookie as _parse_cookie
+
+
+class MultiDict(_MultiDict):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.utils.MultiDict' has moved to 'werkzeug"
+            ".datastructures.MultiDict' as of version 0.5. This old"
+            " import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(MultiDict, self).__init__(*args, **kwargs)
+
+
+class CombinedMultiDict(_CombinedMultiDict):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.utils.CombinedMultiDict' has moved to 'werkzeug"
+            ".datastructures.CombinedMultiDict' as of version 0.5. This"
+            " old import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(CombinedMultiDict, self).__init__(*args, **kwargs)
+
+
+class Headers(_Headers):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.utils.Headers' has moved to 'werkzeug"
+            ".datastructures.Headers' as of version 0.5. This old"
+            " import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(Headers, self).__init__(*args, **kwargs)
+
+
+class EnvironHeaders(_EnvironHeaders):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.utils.EnvironHeaders' has moved to 'werkzeug"
+            ".datastructures.EnvironHeaders' as of version 0.5. This"
+            " old import will be removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(EnvironHeaders, self).__init__(*args, **kwargs)
+
+
+def parse_cookie(*args, **kwargs):
+    warnings.warn(
+        "'werkzeug.utils.parse_cookie' as moved to 'werkzeug.http"
+        ".parse_cookie' as of version 0.5. This old import will be"
+        " removed in version 1.0.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
+    return _parse_cookie(*args, **kwargs)
+
+
+def dump_cookie(*args, **kwargs):
+    warnings.warn(
+        "'werkzeug.utils.dump_cookie' as moved to 'werkzeug.http"
+        ".dump_cookie' as of version 0.5. This old import will be"
+        " removed in version 1.0.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
+    return _dump_cookie(*args, **kwargs)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/__init__.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/__init__.py
new file mode 100644
index 0000000..56c764a
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/__init__.py
@@ -0,0 +1,36 @@
+"""
+werkzeug.wrappers
+~~~~~~~~~~~~~~~~~
+
+The wrappers are simple request and response objects which you can
+subclass to do whatever you want them to do.  The request object contains
+the information transmitted by the client (webbrowser) and the response
+object contains all the information sent back to the browser.
+
+An important detail is that the request object is created with the WSGI
+environ and will act as high-level proxy whereas the response object is an
+actual WSGI application.
+
+Like everything else in Werkzeug these objects will work correctly with
+unicode data.  Incoming form data parsed by the response object will be
+decoded into an unicode object if possible and if it makes sense.
+
+:copyright: 2007 Pallets
+:license: BSD-3-Clause
+"""
+from .accept import AcceptMixin
+from .auth import AuthorizationMixin
+from .auth import WWWAuthenticateMixin
+from .base_request import BaseRequest
+from .base_response import BaseResponse
+from .common_descriptors import CommonRequestDescriptorsMixin
+from .common_descriptors import CommonResponseDescriptorsMixin
+from .etag import ETagRequestMixin
+from .etag import ETagResponseMixin
+from .request import PlainRequest
+from .request import Request
+from .request import StreamOnlyMixin
+from .response import Response
+from .response import ResponseStream
+from .response import ResponseStreamMixin
+from .user_agent import UserAgentMixin
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/__pycache__/__init__.cpython-37.pyc b/venv/lib/python3.7/site-packages/werkzeug/wrappers/__pycache__/__init__.cpython-37.pyc
new file mode 100644
index 0000000..dfaa166
Binary files /dev/null and b/venv/lib/python3.7/site-packages/werkzeug/wrappers/__pycache__/__init__.cpython-37.pyc differ
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/__pycache__/accept.cpython-37.pyc b/venv/lib/python3.7/site-packages/werkzeug/wrappers/__pycache__/accept.cpython-37.pyc
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diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/accept.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/accept.py
new file mode 100644
index 0000000..d0620a0
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/accept.py
@@ -0,0 +1,50 @@
+from ..datastructures import CharsetAccept
+from ..datastructures import LanguageAccept
+from ..datastructures import MIMEAccept
+from ..http import parse_accept_header
+from ..utils import cached_property
+
+
+class AcceptMixin(object):
+    """A mixin for classes with an :attr:`~BaseResponse.environ` attribute
+    to get all the HTTP accept headers as
+    :class:`~werkzeug.datastructures.Accept` objects (or subclasses
+    thereof).
+    """
+
+    @cached_property
+    def accept_mimetypes(self):
+        """List of mimetypes this client supports as
+        :class:`~werkzeug.datastructures.MIMEAccept` object.
+        """
+        return parse_accept_header(self.environ.get("HTTP_ACCEPT"), MIMEAccept)
+
+    @cached_property
+    def accept_charsets(self):
+        """List of charsets this client supports as
+        :class:`~werkzeug.datastructures.CharsetAccept` object.
+        """
+        return parse_accept_header(
+            self.environ.get("HTTP_ACCEPT_CHARSET"), CharsetAccept
+        )
+
+    @cached_property
+    def accept_encodings(self):
+        """List of encodings this client accepts.  Encodings in a HTTP term
+        are compression encodings such as gzip.  For charsets have a look at
+        :attr:`accept_charset`.
+        """
+        return parse_accept_header(self.environ.get("HTTP_ACCEPT_ENCODING"))
+
+    @cached_property
+    def accept_languages(self):
+        """List of languages this client accepts as
+        :class:`~werkzeug.datastructures.LanguageAccept` object.
+
+        .. versionchanged 0.5
+           In previous versions this was a regular
+           :class:`~werkzeug.datastructures.Accept` object.
+        """
+        return parse_accept_header(
+            self.environ.get("HTTP_ACCEPT_LANGUAGE"), LanguageAccept
+        )
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/auth.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/auth.py
new file mode 100644
index 0000000..714f755
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/auth.py
@@ -0,0 +1,33 @@
+from ..http import parse_authorization_header
+from ..http import parse_www_authenticate_header
+from ..utils import cached_property
+
+
+class AuthorizationMixin(object):
+    """Adds an :attr:`authorization` property that represents the parsed
+    value of the `Authorization` header as
+    :class:`~werkzeug.datastructures.Authorization` object.
+    """
+
+    @cached_property
+    def authorization(self):
+        """The `Authorization` object in parsed form."""
+        header = self.environ.get("HTTP_AUTHORIZATION")
+        return parse_authorization_header(header)
+
+
+class WWWAuthenticateMixin(object):
+    """Adds a :attr:`www_authenticate` property to a response object."""
+
+    @property
+    def www_authenticate(self):
+        """The `WWW-Authenticate` header in a parsed form."""
+
+        def on_update(www_auth):
+            if not www_auth and "www-authenticate" in self.headers:
+                del self.headers["www-authenticate"]
+            elif www_auth:
+                self.headers["WWW-Authenticate"] = www_auth.to_header()
+
+        header = self.headers.get("www-authenticate")
+        return parse_www_authenticate_header(header, on_update)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/base_request.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/base_request.py
new file mode 100644
index 0000000..41e8aad
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/base_request.py
@@ -0,0 +1,693 @@
+import warnings
+from functools import update_wrapper
+from io import BytesIO
+
+from .._compat import to_native
+from .._compat import to_unicode
+from .._compat import wsgi_decoding_dance
+from .._compat import wsgi_get_bytes
+from ..datastructures import CombinedMultiDict
+from ..datastructures import EnvironHeaders
+from ..datastructures import ImmutableList
+from ..datastructures import ImmutableMultiDict
+from ..datastructures import ImmutableTypeConversionDict
+from ..datastructures import iter_multi_items
+from ..datastructures import MultiDict
+from ..formparser import default_stream_factory
+from ..formparser import FormDataParser
+from ..http import parse_cookie
+from ..http import parse_options_header
+from ..urls import url_decode
+from ..utils import cached_property
+from ..utils import environ_property
+from ..wsgi import get_content_length
+from ..wsgi import get_current_url
+from ..wsgi import get_host
+from ..wsgi import get_input_stream
+
+
+class BaseRequest(object):
+    """Very basic request object.  This does not implement advanced stuff like
+    entity tag parsing or cache controls.  The request object is created with
+    the WSGI environment as first argument and will add itself to the WSGI
+    environment as ``'werkzeug.request'`` unless it's created with
+    `populate_request` set to False.
+
+    There are a couple of mixins available that add additional functionality
+    to the request object, there is also a class called `Request` which
+    subclasses `BaseRequest` and all the important mixins.
+
+    It's a good idea to create a custom subclass of the :class:`BaseRequest`
+    and add missing functionality either via mixins or direct implementation.
+    Here an example for such subclasses::
+
+        from werkzeug.wrappers import BaseRequest, ETagRequestMixin
+
+        class Request(BaseRequest, ETagRequestMixin):
+            pass
+
+    Request objects are **read only**.  As of 0.5 modifications are not
+    allowed in any place.  Unlike the lower level parsing functions the
+    request object will use immutable objects everywhere possible.
+
+    Per default the request object will assume all the text data is `utf-8`
+    encoded.  Please refer to :doc:`the unicode chapter ` for more
+    details about customizing the behavior.
+
+    Per default the request object will be added to the WSGI
+    environment as `werkzeug.request` to support the debugging system.
+    If you don't want that, set `populate_request` to `False`.
+
+    If `shallow` is `True` the environment is initialized as shallow
+    object around the environ.  Every operation that would modify the
+    environ in any way (such as consuming form data) raises an exception
+    unless the `shallow` attribute is explicitly set to `False`.  This
+    is useful for middlewares where you don't want to consume the form
+    data by accident.  A shallow request is not populated to the WSGI
+    environment.
+
+    .. versionchanged:: 0.5
+       read-only mode was enforced by using immutables classes for all
+       data.
+    """
+
+    #: the charset for the request, defaults to utf-8
+    charset = "utf-8"
+
+    #: the error handling procedure for errors, defaults to 'replace'
+    encoding_errors = "replace"
+
+    #: the maximum content length.  This is forwarded to the form data
+    #: parsing function (:func:`parse_form_data`).  When set and the
+    #: :attr:`form` or :attr:`files` attribute is accessed and the
+    #: parsing fails because more than the specified value is transmitted
+    #: a :exc:`~werkzeug.exceptions.RequestEntityTooLarge` exception is raised.
+    #:
+    #: Have a look at :ref:`dealing-with-request-data` for more details.
+    #:
+    #: .. versionadded:: 0.5
+    max_content_length = None
+
+    #: the maximum form field size.  This is forwarded to the form data
+    #: parsing function (:func:`parse_form_data`).  When set and the
+    #: :attr:`form` or :attr:`files` attribute is accessed and the
+    #: data in memory for post data is longer than the specified value a
+    #: :exc:`~werkzeug.exceptions.RequestEntityTooLarge` exception is raised.
+    #:
+    #: Have a look at :ref:`dealing-with-request-data` for more details.
+    #:
+    #: .. versionadded:: 0.5
+    max_form_memory_size = None
+
+    #: the class to use for `args` and `form`.  The default is an
+    #: :class:`~werkzeug.datastructures.ImmutableMultiDict` which supports
+    #: multiple values per key.  alternatively it makes sense to use an
+    #: :class:`~werkzeug.datastructures.ImmutableOrderedMultiDict` which
+    #: preserves order or a :class:`~werkzeug.datastructures.ImmutableDict`
+    #: which is the fastest but only remembers the last key.  It is also
+    #: possible to use mutable structures, but this is not recommended.
+    #:
+    #: .. versionadded:: 0.6
+    parameter_storage_class = ImmutableMultiDict
+
+    #: the type to be used for list values from the incoming WSGI environment.
+    #: By default an :class:`~werkzeug.datastructures.ImmutableList` is used
+    #: (for example for :attr:`access_list`).
+    #:
+    #: .. versionadded:: 0.6
+    list_storage_class = ImmutableList
+
+    #: the type to be used for dict values from the incoming WSGI environment.
+    #: By default an
+    #: :class:`~werkzeug.datastructures.ImmutableTypeConversionDict` is used
+    #: (for example for :attr:`cookies`).
+    #:
+    #: .. versionadded:: 0.6
+    dict_storage_class = ImmutableTypeConversionDict
+
+    #: The form data parser that shoud be used.  Can be replaced to customize
+    #: the form date parsing.
+    form_data_parser_class = FormDataParser
+
+    #: Optionally a list of hosts that is trusted by this request.  By default
+    #: all hosts are trusted which means that whatever the client sends the
+    #: host is will be accepted.
+    #:
+    #: Because `Host` and `X-Forwarded-Host` headers can be set to any value by
+    #: a malicious client, it is recommended to either set this property or
+    #: implement similar validation in the proxy (if application is being run
+    #: behind one).
+    #:
+    #: .. versionadded:: 0.9
+    trusted_hosts = None
+
+    #: Indicates whether the data descriptor should be allowed to read and
+    #: buffer up the input stream.  By default it's enabled.
+    #:
+    #: .. versionadded:: 0.9
+    disable_data_descriptor = False
+
+    def __init__(self, environ, populate_request=True, shallow=False):
+        self.environ = environ
+        if populate_request and not shallow:
+            self.environ["werkzeug.request"] = self
+        self.shallow = shallow
+
+    def __repr__(self):
+        # make sure the __repr__ even works if the request was created
+        # from an invalid WSGI environment.  If we display the request
+        # in a debug session we don't want the repr to blow up.
+        args = []
+        try:
+            args.append("'%s'" % to_native(self.url, self.url_charset))
+            args.append("[%s]" % self.method)
+        except Exception:
+            args.append("(invalid WSGI environ)")
+
+        return "<%s %s>" % (self.__class__.__name__, " ".join(args))
+
+    @property
+    def url_charset(self):
+        """The charset that is assumed for URLs.  Defaults to the value
+        of :attr:`charset`.
+
+        .. versionadded:: 0.6
+        """
+        return self.charset
+
+    @classmethod
+    def from_values(cls, *args, **kwargs):
+        """Create a new request object based on the values provided.  If
+        environ is given missing values are filled from there.  This method is
+        useful for small scripts when you need to simulate a request from an URL.
+        Do not use this method for unittesting, there is a full featured client
+        object (:class:`Client`) that allows to create multipart requests,
+        support for cookies etc.
+
+        This accepts the same options as the
+        :class:`~werkzeug.test.EnvironBuilder`.
+
+        .. versionchanged:: 0.5
+           This method now accepts the same arguments as
+           :class:`~werkzeug.test.EnvironBuilder`.  Because of this the
+           `environ` parameter is now called `environ_overrides`.
+
+        :return: request object
+        """
+        from ..test import EnvironBuilder
+
+        charset = kwargs.pop("charset", cls.charset)
+        kwargs["charset"] = charset
+        builder = EnvironBuilder(*args, **kwargs)
+        try:
+            return builder.get_request(cls)
+        finally:
+            builder.close()
+
+    @classmethod
+    def application(cls, f):
+        """Decorate a function as responder that accepts the request as first
+        argument.  This works like the :func:`responder` decorator but the
+        function is passed the request object as first argument and the
+        request object will be closed automatically::
+
+            @Request.application
+            def my_wsgi_app(request):
+                return Response('Hello World!')
+
+        As of Werkzeug 0.14 HTTP exceptions are automatically caught and
+        converted to responses instead of failing.
+
+        :param f: the WSGI callable to decorate
+        :return: a new WSGI callable
+        """
+        #: return a callable that wraps the -2nd argument with the request
+        #: and calls the function with all the arguments up to that one and
+        #: the request.  The return value is then called with the latest
+        #: two arguments.  This makes it possible to use this decorator for
+        #: both methods and standalone WSGI functions.
+        from ..exceptions import HTTPException
+
+        def application(*args):
+            request = cls(args[-2])
+            with request:
+                try:
+                    resp = f(*args[:-2] + (request,))
+                except HTTPException as e:
+                    resp = e.get_response(args[-2])
+                return resp(*args[-2:])
+
+        return update_wrapper(application, f)
+
+    def _get_file_stream(
+        self, total_content_length, content_type, filename=None, content_length=None
+    ):
+        """Called to get a stream for the file upload.
+
+        This must provide a file-like class with `read()`, `readline()`
+        and `seek()` methods that is both writeable and readable.
+
+        The default implementation returns a temporary file if the total
+        content length is higher than 500KB.  Because many browsers do not
+        provide a content length for the files only the total content
+        length matters.
+
+        :param total_content_length: the total content length of all the
+                                     data in the request combined.  This value
+                                     is guaranteed to be there.
+        :param content_type: the mimetype of the uploaded file.
+        :param filename: the filename of the uploaded file.  May be `None`.
+        :param content_length: the length of this file.  This value is usually
+                               not provided because webbrowsers do not provide
+                               this value.
+        """
+        return default_stream_factory(
+            total_content_length=total_content_length,
+            filename=filename,
+            content_type=content_type,
+            content_length=content_length,
+        )
+
+    @property
+    def want_form_data_parsed(self):
+        """Returns True if the request method carries content.  As of
+        Werkzeug 0.9 this will be the case if a content type is transmitted.
+
+        .. versionadded:: 0.8
+        """
+        return bool(self.environ.get("CONTENT_TYPE"))
+
+    def make_form_data_parser(self):
+        """Creates the form data parser. Instantiates the
+        :attr:`form_data_parser_class` with some parameters.
+
+        .. versionadded:: 0.8
+        """
+        return self.form_data_parser_class(
+            self._get_file_stream,
+            self.charset,
+            self.encoding_errors,
+            self.max_form_memory_size,
+            self.max_content_length,
+            self.parameter_storage_class,
+        )
+
+    def _load_form_data(self):
+        """Method used internally to retrieve submitted data.  After calling
+        this sets `form` and `files` on the request object to multi dicts
+        filled with the incoming form data.  As a matter of fact the input
+        stream will be empty afterwards.  You can also call this method to
+        force the parsing of the form data.
+
+        .. versionadded:: 0.8
+        """
+        # abort early if we have already consumed the stream
+        if "form" in self.__dict__:
+            return
+
+        _assert_not_shallow(self)
+
+        if self.want_form_data_parsed:
+            content_type = self.environ.get("CONTENT_TYPE", "")
+            content_length = get_content_length(self.environ)
+            mimetype, options = parse_options_header(content_type)
+            parser = self.make_form_data_parser()
+            data = parser.parse(
+                self._get_stream_for_parsing(), mimetype, content_length, options
+            )
+        else:
+            data = (
+                self.stream,
+                self.parameter_storage_class(),
+                self.parameter_storage_class(),
+            )
+
+        # inject the values into the instance dict so that we bypass
+        # our cached_property non-data descriptor.
+        d = self.__dict__
+        d["stream"], d["form"], d["files"] = data
+
+    def _get_stream_for_parsing(self):
+        """This is the same as accessing :attr:`stream` with the difference
+        that if it finds cached data from calling :meth:`get_data` first it
+        will create a new stream out of the cached data.
+
+        .. versionadded:: 0.9.3
+        """
+        cached_data = getattr(self, "_cached_data", None)
+        if cached_data is not None:
+            return BytesIO(cached_data)
+        return self.stream
+
+    def close(self):
+        """Closes associated resources of this request object.  This
+        closes all file handles explicitly.  You can also use the request
+        object in a with statement which will automatically close it.
+
+        .. versionadded:: 0.9
+        """
+        files = self.__dict__.get("files")
+        for _key, value in iter_multi_items(files or ()):
+            value.close()
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, tb):
+        self.close()
+
+    @cached_property
+    def stream(self):
+        """
+        If the incoming form data was not encoded with a known mimetype
+        the data is stored unmodified in this stream for consumption.  Most
+        of the time it is a better idea to use :attr:`data` which will give
+        you that data as a string.  The stream only returns the data once.
+
+        Unlike :attr:`input_stream` this stream is properly guarded that you
+        can't accidentally read past the length of the input.  Werkzeug will
+        internally always refer to this stream to read data which makes it
+        possible to wrap this object with a stream that does filtering.
+
+        .. versionchanged:: 0.9
+           This stream is now always available but might be consumed by the
+           form parser later on.  Previously the stream was only set if no
+           parsing happened.
+        """
+        _assert_not_shallow(self)
+        return get_input_stream(self.environ)
+
+    input_stream = environ_property(
+        "wsgi.input",
+        """The WSGI input stream.
+
+        In general it's a bad idea to use this one because you can
+        easily read past the boundary.  Use the :attr:`stream`
+        instead.""",
+    )
+
+    @cached_property
+    def args(self):
+        """The parsed URL parameters (the part in the URL after the question
+        mark).
+
+        By default an
+        :class:`~werkzeug.datastructures.ImmutableMultiDict`
+        is returned from this function.  This can be changed by setting
+        :attr:`parameter_storage_class` to a different type.  This might
+        be necessary if the order of the form data is important.
+        """
+        return url_decode(
+            wsgi_get_bytes(self.environ.get("QUERY_STRING", "")),
+            self.url_charset,
+            errors=self.encoding_errors,
+            cls=self.parameter_storage_class,
+        )
+
+    @cached_property
+    def data(self):
+        """
+        Contains the incoming request data as string in case it came with
+        a mimetype Werkzeug does not handle.
+        """
+
+        if self.disable_data_descriptor:
+            raise AttributeError("data descriptor is disabled")
+        # XXX: this should eventually be deprecated.
+
+        # We trigger form data parsing first which means that the descriptor
+        # will not cache the data that would otherwise be .form or .files
+        # data.  This restores the behavior that was there in Werkzeug
+        # before 0.9.  New code should use :meth:`get_data` explicitly as
+        # this will make behavior explicit.
+        return self.get_data(parse_form_data=True)
+
+    def get_data(self, cache=True, as_text=False, parse_form_data=False):
+        """This reads the buffered incoming data from the client into one
+        bytestring.  By default this is cached but that behavior can be
+        changed by setting `cache` to `False`.
+
+        Usually it's a bad idea to call this method without checking the
+        content length first as a client could send dozens of megabytes or more
+        to cause memory problems on the server.
+
+        Note that if the form data was already parsed this method will not
+        return anything as form data parsing does not cache the data like
+        this method does.  To implicitly invoke form data parsing function
+        set `parse_form_data` to `True`.  When this is done the return value
+        of this method will be an empty string if the form parser handles
+        the data.  This generally is not necessary as if the whole data is
+        cached (which is the default) the form parser will used the cached
+        data to parse the form data.  Please be generally aware of checking
+        the content length first in any case before calling this method
+        to avoid exhausting server memory.
+
+        If `as_text` is set to `True` the return value will be a decoded
+        unicode string.
+
+        .. versionadded:: 0.9
+        """
+        rv = getattr(self, "_cached_data", None)
+        if rv is None:
+            if parse_form_data:
+                self._load_form_data()
+            rv = self.stream.read()
+            if cache:
+                self._cached_data = rv
+        if as_text:
+            rv = rv.decode(self.charset, self.encoding_errors)
+        return rv
+
+    @cached_property
+    def form(self):
+        """The form parameters.  By default an
+        :class:`~werkzeug.datastructures.ImmutableMultiDict`
+        is returned from this function.  This can be changed by setting
+        :attr:`parameter_storage_class` to a different type.  This might
+        be necessary if the order of the form data is important.
+
+        Please keep in mind that file uploads will not end up here, but instead
+        in the :attr:`files` attribute.
+
+        .. versionchanged:: 0.9
+
+            Previous to Werkzeug 0.9 this would only contain form data for POST
+            and PUT requests.
+        """
+        self._load_form_data()
+        return self.form
+
+    @cached_property
+    def values(self):
+        """A :class:`werkzeug.datastructures.CombinedMultiDict` that combines
+        :attr:`args` and :attr:`form`."""
+        args = []
+        for d in self.args, self.form:
+            if not isinstance(d, MultiDict):
+                d = MultiDict(d)
+            args.append(d)
+        return CombinedMultiDict(args)
+
+    @cached_property
+    def files(self):
+        """:class:`~werkzeug.datastructures.MultiDict` object containing
+        all uploaded files.  Each key in :attr:`files` is the name from the
+        ````.  Each value in :attr:`files` is a
+        Werkzeug :class:`~werkzeug.datastructures.FileStorage` object.
+
+        It basically behaves like a standard file object you know from Python,
+        with the difference that it also has a
+        :meth:`~werkzeug.datastructures.FileStorage.save` function that can
+        store the file on the filesystem.
+
+        Note that :attr:`files` will only contain data if the request method was
+        POST, PUT or PATCH and the ``
    `` that posted to the request had
+        ``enctype="multipart/form-data"``.  It will be empty otherwise.
+
+        See the :class:`~werkzeug.datastructures.MultiDict` /
+        :class:`~werkzeug.datastructures.FileStorage` documentation for
+        more details about the used data structure.
+        """
+        self._load_form_data()
+        return self.files
+
+    @cached_property
+    def cookies(self):
+        """A :class:`dict` with the contents of all cookies transmitted with
+        the request."""
+        return parse_cookie(
+            self.environ,
+            self.charset,
+            self.encoding_errors,
+            cls=self.dict_storage_class,
+        )
+
+    @cached_property
+    def headers(self):
+        """The headers from the WSGI environ as immutable
+        :class:`~werkzeug.datastructures.EnvironHeaders`.
+        """
+        return EnvironHeaders(self.environ)
+
+    @cached_property
+    def path(self):
+        """Requested path as unicode.  This works a bit like the regular path
+        info in the WSGI environment but will always include a leading slash,
+        even if the URL root is accessed.
+        """
+        raw_path = wsgi_decoding_dance(
+            self.environ.get("PATH_INFO") or "", self.charset, self.encoding_errors
+        )
+        return "/" + raw_path.lstrip("/")
+
+    @cached_property
+    def full_path(self):
+        """Requested path as unicode, including the query string."""
+        return self.path + u"?" + to_unicode(self.query_string, self.url_charset)
+
+    @cached_property
+    def script_root(self):
+        """The root path of the script without the trailing slash."""
+        raw_path = wsgi_decoding_dance(
+            self.environ.get("SCRIPT_NAME") or "", self.charset, self.encoding_errors
+        )
+        return raw_path.rstrip("/")
+
+    @cached_property
+    def url(self):
+        """The reconstructed current URL as IRI.
+        See also: :attr:`trusted_hosts`.
+        """
+        return get_current_url(self.environ, trusted_hosts=self.trusted_hosts)
+
+    @cached_property
+    def base_url(self):
+        """Like :attr:`url` but without the querystring
+        See also: :attr:`trusted_hosts`.
+        """
+        return get_current_url(
+            self.environ, strip_querystring=True, trusted_hosts=self.trusted_hosts
+        )
+
+    @cached_property
+    def url_root(self):
+        """The full URL root (with hostname), this is the application
+        root as IRI.
+        See also: :attr:`trusted_hosts`.
+        """
+        return get_current_url(self.environ, True, trusted_hosts=self.trusted_hosts)
+
+    @cached_property
+    def host_url(self):
+        """Just the host with scheme as IRI.
+        See also: :attr:`trusted_hosts`.
+        """
+        return get_current_url(
+            self.environ, host_only=True, trusted_hosts=self.trusted_hosts
+        )
+
+    @cached_property
+    def host(self):
+        """Just the host including the port if available.
+        See also: :attr:`trusted_hosts`.
+        """
+        return get_host(self.environ, trusted_hosts=self.trusted_hosts)
+
+    query_string = environ_property(
+        "QUERY_STRING",
+        "",
+        read_only=True,
+        load_func=wsgi_get_bytes,
+        doc="The URL parameters as raw bytestring.",
+    )
+    method = environ_property(
+        "REQUEST_METHOD",
+        "GET",
+        read_only=True,
+        load_func=lambda x: x.upper(),
+        doc="The request method. (For example ``'GET'`` or ``'POST'``).",
+    )
+
+    @cached_property
+    def access_route(self):
+        """If a forwarded header exists this is a list of all ip addresses
+        from the client ip to the last proxy server.
+        """
+        if "HTTP_X_FORWARDED_FOR" in self.environ:
+            addr = self.environ["HTTP_X_FORWARDED_FOR"].split(",")
+            return self.list_storage_class([x.strip() for x in addr])
+        elif "REMOTE_ADDR" in self.environ:
+            return self.list_storage_class([self.environ["REMOTE_ADDR"]])
+        return self.list_storage_class()
+
+    @property
+    def remote_addr(self):
+        """The remote address of the client."""
+        return self.environ.get("REMOTE_ADDR")
+
+    remote_user = environ_property(
+        "REMOTE_USER",
+        doc="""If the server supports user authentication, and the
+        script is protected, this attribute contains the username the
+        user has authenticated as.""",
+    )
+
+    scheme = environ_property(
+        "wsgi.url_scheme",
+        doc="""
+        URL scheme (http or https).
+
+        .. versionadded:: 0.7""",
+    )
+
+    @property
+    def is_xhr(self):
+        """True if the request was triggered via a JavaScript XMLHttpRequest.
+        This only works with libraries that support the ``X-Requested-With``
+        header and set it to "XMLHttpRequest".  Libraries that do that are
+        prototype, jQuery and Mochikit and probably some more.
+
+        .. deprecated:: 0.13
+            ``X-Requested-With`` is not standard and is unreliable. You
+            may be able to use :attr:`AcceptMixin.accept_mimetypes`
+            instead.
+        """
+        warnings.warn(
+            "'Request.is_xhr' is deprecated as of version 0.13 and will"
+            " be removed in version 1.0. The 'X-Requested-With' header"
+            " is not standard and is unreliable. You may be able to use"
+            " 'accept_mimetypes' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return self.environ.get("HTTP_X_REQUESTED_WITH", "").lower() == "xmlhttprequest"
+
+    is_secure = property(
+        lambda self: self.environ["wsgi.url_scheme"] == "https",
+        doc="`True` if the request is secure.",
+    )
+    is_multithread = environ_property(
+        "wsgi.multithread",
+        doc="""boolean that is `True` if the application is served by a
+        multithreaded WSGI server.""",
+    )
+    is_multiprocess = environ_property(
+        "wsgi.multiprocess",
+        doc="""boolean that is `True` if the application is served by a
+        WSGI server that spawns multiple processes.""",
+    )
+    is_run_once = environ_property(
+        "wsgi.run_once",
+        doc="""boolean that is `True` if the application will be
+        executed only once in a process lifetime.  This is the case for
+        CGI for example, but it's not guaranteed that the execution only
+        happens one time.""",
+    )
+
+
+def _assert_not_shallow(request):
+    if request.shallow:
+        raise RuntimeError(
+            "A shallow request tried to consume form data. If you really"
+            " want to do that, set `shallow` to False."
+        )
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/base_response.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/base_response.py
new file mode 100644
index 0000000..d944a7d
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/base_response.py
@@ -0,0 +1,702 @@
+import warnings
+
+from .._compat import integer_types
+from .._compat import string_types
+from .._compat import text_type
+from .._compat import to_bytes
+from .._compat import to_native
+from ..datastructures import Headers
+from ..http import dump_cookie
+from ..http import HTTP_STATUS_CODES
+from ..http import remove_entity_headers
+from ..urls import iri_to_uri
+from ..urls import url_join
+from ..utils import get_content_type
+from ..wsgi import ClosingIterator
+from ..wsgi import get_current_url
+
+
+def _run_wsgi_app(*args):
+    """This function replaces itself to ensure that the test module is not
+    imported unless required.  DO NOT USE!
+    """
+    global _run_wsgi_app
+    from ..test import run_wsgi_app as _run_wsgi_app
+
+    return _run_wsgi_app(*args)
+
+
+def _warn_if_string(iterable):
+    """Helper for the response objects to check if the iterable returned
+    to the WSGI server is not a string.
+    """
+    if isinstance(iterable, string_types):
+        warnings.warn(
+            "Response iterable was set to a string. This will appear to"
+            " work but means that the server will send the data to the"
+            " client one character at a time. This is almost never"
+            " intended behavior, use 'response.data' to assign strings"
+            " to the response object.",
+            stacklevel=2,
+        )
+
+
+def _iter_encoded(iterable, charset):
+    for item in iterable:
+        if isinstance(item, text_type):
+            yield item.encode(charset)
+        else:
+            yield item
+
+
+def _clean_accept_ranges(accept_ranges):
+    if accept_ranges is True:
+        return "bytes"
+    elif accept_ranges is False:
+        return "none"
+    elif isinstance(accept_ranges, text_type):
+        return to_native(accept_ranges)
+    raise ValueError("Invalid accept_ranges value")
+
+
+class BaseResponse(object):
+    """Base response class.  The most important fact about a response object
+    is that it's a regular WSGI application.  It's initialized with a couple
+    of response parameters (headers, body, status code etc.) and will start a
+    valid WSGI response when called with the environ and start response
+    callable.
+
+    Because it's a WSGI application itself processing usually ends before the
+    actual response is sent to the server.  This helps debugging systems
+    because they can catch all the exceptions before responses are started.
+
+    Here a small example WSGI application that takes advantage of the
+    response objects::
+
+        from werkzeug.wrappers import BaseResponse as Response
+
+        def index():
+            return Response('Index page')
+
+        def application(environ, start_response):
+            path = environ.get('PATH_INFO') or '/'
+            if path == '/':
+                response = index()
+            else:
+                response = Response('Not Found', status=404)
+            return response(environ, start_response)
+
+    Like :class:`BaseRequest` which object is lacking a lot of functionality
+    implemented in mixins.  This gives you a better control about the actual
+    API of your response objects, so you can create subclasses and add custom
+    functionality.  A full featured response object is available as
+    :class:`Response` which implements a couple of useful mixins.
+
+    To enforce a new type of already existing responses you can use the
+    :meth:`force_type` method.  This is useful if you're working with different
+    subclasses of response objects and you want to post process them with a
+    known interface.
+
+    Per default the response object will assume all the text data is `utf-8`
+    encoded.  Please refer to :doc:`the unicode chapter ` for more
+    details about customizing the behavior.
+
+    Response can be any kind of iterable or string.  If it's a string it's
+    considered being an iterable with one item which is the string passed.
+    Headers can be a list of tuples or a
+    :class:`~werkzeug.datastructures.Headers` object.
+
+    Special note for `mimetype` and `content_type`:  For most mime types
+    `mimetype` and `content_type` work the same, the difference affects
+    only 'text' mimetypes.  If the mimetype passed with `mimetype` is a
+    mimetype starting with `text/`, the charset parameter of the response
+    object is appended to it.  In contrast the `content_type` parameter is
+    always added as header unmodified.
+
+    .. versionchanged:: 0.5
+       the `direct_passthrough` parameter was added.
+
+    :param response: a string or response iterable.
+    :param status: a string with a status or an integer with the status code.
+    :param headers: a list of headers or a
+                    :class:`~werkzeug.datastructures.Headers` object.
+    :param mimetype: the mimetype for the response.  See notice above.
+    :param content_type: the content type for the response.  See notice above.
+    :param direct_passthrough: if set to `True` :meth:`iter_encoded` is not
+                               called before iteration which makes it
+                               possible to pass special iterators through
+                               unchanged (see :func:`wrap_file` for more
+                               details.)
+    """
+
+    #: the charset of the response.
+    charset = "utf-8"
+
+    #: the default status if none is provided.
+    default_status = 200
+
+    #: the default mimetype if none is provided.
+    default_mimetype = "text/plain"
+
+    #: if set to `False` accessing properties on the response object will
+    #: not try to consume the response iterator and convert it into a list.
+    #:
+    #: .. versionadded:: 0.6.2
+    #:
+    #:    That attribute was previously called `implicit_seqence_conversion`.
+    #:    (Notice the typo).  If you did use this feature, you have to adapt
+    #:    your code to the name change.
+    implicit_sequence_conversion = True
+
+    #: Should this response object correct the location header to be RFC
+    #: conformant?  This is true by default.
+    #:
+    #: .. versionadded:: 0.8
+    autocorrect_location_header = True
+
+    #: Should this response object automatically set the content-length
+    #: header if possible?  This is true by default.
+    #:
+    #: .. versionadded:: 0.8
+    automatically_set_content_length = True
+
+    #: Warn if a cookie header exceeds this size. The default, 4093, should be
+    #: safely `supported by most browsers `_. A cookie larger than
+    #: this size will still be sent, but it may be ignored or handled
+    #: incorrectly by some browsers. Set to 0 to disable this check.
+    #:
+    #: .. versionadded:: 0.13
+    #:
+    #: .. _`cookie`: http://browsercookielimits.squawky.net/
+    max_cookie_size = 4093
+
+    def __init__(
+        self,
+        response=None,
+        status=None,
+        headers=None,
+        mimetype=None,
+        content_type=None,
+        direct_passthrough=False,
+    ):
+        if isinstance(headers, Headers):
+            self.headers = headers
+        elif not headers:
+            self.headers = Headers()
+        else:
+            self.headers = Headers(headers)
+
+        if content_type is None:
+            if mimetype is None and "content-type" not in self.headers:
+                mimetype = self.default_mimetype
+            if mimetype is not None:
+                mimetype = get_content_type(mimetype, self.charset)
+            content_type = mimetype
+        if content_type is not None:
+            self.headers["Content-Type"] = content_type
+        if status is None:
+            status = self.default_status
+        if isinstance(status, integer_types):
+            self.status_code = status
+        else:
+            self.status = status
+
+        self.direct_passthrough = direct_passthrough
+        self._on_close = []
+
+        # we set the response after the headers so that if a class changes
+        # the charset attribute, the data is set in the correct charset.
+        if response is None:
+            self.response = []
+        elif isinstance(response, (text_type, bytes, bytearray)):
+            self.set_data(response)
+        else:
+            self.response = response
+
+    def call_on_close(self, func):
+        """Adds a function to the internal list of functions that should
+        be called as part of closing down the response.  Since 0.7 this
+        function also returns the function that was passed so that this
+        can be used as a decorator.
+
+        .. versionadded:: 0.6
+        """
+        self._on_close.append(func)
+        return func
+
+    def __repr__(self):
+        if self.is_sequence:
+            body_info = "%d bytes" % sum(map(len, self.iter_encoded()))
+        else:
+            body_info = "streamed" if self.is_streamed else "likely-streamed"
+        return "<%s %s [%s]>" % (self.__class__.__name__, body_info, self.status)
+
+    @classmethod
+    def force_type(cls, response, environ=None):
+        """Enforce that the WSGI response is a response object of the current
+        type.  Werkzeug will use the :class:`BaseResponse` internally in many
+        situations like the exceptions.  If you call :meth:`get_response` on an
+        exception you will get back a regular :class:`BaseResponse` object, even
+        if you are using a custom subclass.
+
+        This method can enforce a given response type, and it will also
+        convert arbitrary WSGI callables into response objects if an environ
+        is provided::
+
+            # convert a Werkzeug response object into an instance of the
+            # MyResponseClass subclass.
+            response = MyResponseClass.force_type(response)
+
+            # convert any WSGI application into a response object
+            response = MyResponseClass.force_type(response, environ)
+
+        This is especially useful if you want to post-process responses in
+        the main dispatcher and use functionality provided by your subclass.
+
+        Keep in mind that this will modify response objects in place if
+        possible!
+
+        :param response: a response object or wsgi application.
+        :param environ: a WSGI environment object.
+        :return: a response object.
+        """
+        if not isinstance(response, BaseResponse):
+            if environ is None:
+                raise TypeError(
+                    "cannot convert WSGI application into response"
+                    " objects without an environ"
+                )
+            response = BaseResponse(*_run_wsgi_app(response, environ))
+        response.__class__ = cls
+        return response
+
+    @classmethod
+    def from_app(cls, app, environ, buffered=False):
+        """Create a new response object from an application output.  This
+        works best if you pass it an application that returns a generator all
+        the time.  Sometimes applications may use the `write()` callable
+        returned by the `start_response` function.  This tries to resolve such
+        edge cases automatically.  But if you don't get the expected output
+        you should set `buffered` to `True` which enforces buffering.
+
+        :param app: the WSGI application to execute.
+        :param environ: the WSGI environment to execute against.
+        :param buffered: set to `True` to enforce buffering.
+        :return: a response object.
+        """
+        return cls(*_run_wsgi_app(app, environ, buffered))
+
+    def _get_status_code(self):
+        return self._status_code
+
+    def _set_status_code(self, code):
+        self._status_code = code
+        try:
+            self._status = "%d %s" % (code, HTTP_STATUS_CODES[code].upper())
+        except KeyError:
+            self._status = "%d UNKNOWN" % code
+
+    status_code = property(
+        _get_status_code, _set_status_code, doc="The HTTP Status code as number"
+    )
+    del _get_status_code, _set_status_code
+
+    def _get_status(self):
+        return self._status
+
+    def _set_status(self, value):
+        try:
+            self._status = to_native(value)
+        except AttributeError:
+            raise TypeError("Invalid status argument")
+
+        try:
+            self._status_code = int(self._status.split(None, 1)[0])
+        except ValueError:
+            self._status_code = 0
+            self._status = "0 %s" % self._status
+        except IndexError:
+            raise ValueError("Empty status argument")
+
+    status = property(_get_status, _set_status, doc="The HTTP Status code")
+    del _get_status, _set_status
+
+    def get_data(self, as_text=False):
+        """The string representation of the request body.  Whenever you call
+        this property the request iterable is encoded and flattened.  This
+        can lead to unwanted behavior if you stream big data.
+
+        This behavior can be disabled by setting
+        :attr:`implicit_sequence_conversion` to `False`.
+
+        If `as_text` is set to `True` the return value will be a decoded
+        unicode string.
+
+        .. versionadded:: 0.9
+        """
+        self._ensure_sequence()
+        rv = b"".join(self.iter_encoded())
+        if as_text:
+            rv = rv.decode(self.charset)
+        return rv
+
+    def set_data(self, value):
+        """Sets a new string as response.  The value set must either by a
+        unicode or bytestring.  If a unicode string is set it's encoded
+        automatically to the charset of the response (utf-8 by default).
+
+        .. versionadded:: 0.9
+        """
+        # if an unicode string is set, it's encoded directly so that we
+        # can set the content length
+        if isinstance(value, text_type):
+            value = value.encode(self.charset)
+        else:
+            value = bytes(value)
+        self.response = [value]
+        if self.automatically_set_content_length:
+            self.headers["Content-Length"] = str(len(value))
+
+    data = property(
+        get_data,
+        set_data,
+        doc="A descriptor that calls :meth:`get_data` and :meth:`set_data`.",
+    )
+
+    def calculate_content_length(self):
+        """Returns the content length if available or `None` otherwise."""
+        try:
+            self._ensure_sequence()
+        except RuntimeError:
+            return None
+        return sum(len(x) for x in self.iter_encoded())
+
+    def _ensure_sequence(self, mutable=False):
+        """This method can be called by methods that need a sequence.  If
+        `mutable` is true, it will also ensure that the response sequence
+        is a standard Python list.
+
+        .. versionadded:: 0.6
+        """
+        if self.is_sequence:
+            # if we need a mutable object, we ensure it's a list.
+            if mutable and not isinstance(self.response, list):
+                self.response = list(self.response)
+            return
+        if self.direct_passthrough:
+            raise RuntimeError(
+                "Attempted implicit sequence conversion but the"
+                " response object is in direct passthrough mode."
+            )
+        if not self.implicit_sequence_conversion:
+            raise RuntimeError(
+                "The response object required the iterable to be a"
+                " sequence, but the implicit conversion was disabled."
+                " Call make_sequence() yourself."
+            )
+        self.make_sequence()
+
+    def make_sequence(self):
+        """Converts the response iterator in a list.  By default this happens
+        automatically if required.  If `implicit_sequence_conversion` is
+        disabled, this method is not automatically called and some properties
+        might raise exceptions.  This also encodes all the items.
+
+        .. versionadded:: 0.6
+        """
+        if not self.is_sequence:
+            # if we consume an iterable we have to ensure that the close
+            # method of the iterable is called if available when we tear
+            # down the response
+            close = getattr(self.response, "close", None)
+            self.response = list(self.iter_encoded())
+            if close is not None:
+                self.call_on_close(close)
+
+    def iter_encoded(self):
+        """Iter the response encoded with the encoding of the response.
+        If the response object is invoked as WSGI application the return
+        value of this method is used as application iterator unless
+        :attr:`direct_passthrough` was activated.
+        """
+        if __debug__:
+            _warn_if_string(self.response)
+        # Encode in a separate function so that self.response is fetched
+        # early.  This allows us to wrap the response with the return
+        # value from get_app_iter or iter_encoded.
+        return _iter_encoded(self.response, self.charset)
+
+    def set_cookie(
+        self,
+        key,
+        value="",
+        max_age=None,
+        expires=None,
+        path="/",
+        domain=None,
+        secure=False,
+        httponly=False,
+        samesite=None,
+    ):
+        """Sets a cookie. The parameters are the same as in the cookie `Morsel`
+        object in the Python standard library but it accepts unicode data, too.
+
+        A warning is raised if the size of the cookie header exceeds
+        :attr:`max_cookie_size`, but the header will still be set.
+
+        :param key: the key (name) of the cookie to be set.
+        :param value: the value of the cookie.
+        :param max_age: should be a number of seconds, or `None` (default) if
+                        the cookie should last only as long as the client's
+                        browser session.
+        :param expires: should be a `datetime` object or UNIX timestamp.
+        :param path: limits the cookie to a given path, per default it will
+                     span the whole domain.
+        :param domain: if you want to set a cross-domain cookie.  For example,
+                       ``domain=".example.com"`` will set a cookie that is
+                       readable by the domain ``www.example.com``,
+                       ``foo.example.com`` etc.  Otherwise, a cookie will only
+                       be readable by the domain that set it.
+        :param secure: If `True`, the cookie will only be available via HTTPS
+        :param httponly: disallow JavaScript to access the cookie.  This is an
+                         extension to the cookie standard and probably not
+                         supported by all browsers.
+        :param samesite: Limits the scope of the cookie such that it will only
+                         be attached to requests if those requests are
+                         "same-site".
+        """
+        self.headers.add(
+            "Set-Cookie",
+            dump_cookie(
+                key,
+                value=value,
+                max_age=max_age,
+                expires=expires,
+                path=path,
+                domain=domain,
+                secure=secure,
+                httponly=httponly,
+                charset=self.charset,
+                max_size=self.max_cookie_size,
+                samesite=samesite,
+            ),
+        )
+
+    def delete_cookie(self, key, path="/", domain=None):
+        """Delete a cookie.  Fails silently if key doesn't exist.
+
+        :param key: the key (name) of the cookie to be deleted.
+        :param path: if the cookie that should be deleted was limited to a
+                     path, the path has to be defined here.
+        :param domain: if the cookie that should be deleted was limited to a
+                       domain, that domain has to be defined here.
+        """
+        self.set_cookie(key, expires=0, max_age=0, path=path, domain=domain)
+
+    @property
+    def is_streamed(self):
+        """If the response is streamed (the response is not an iterable with
+        a length information) this property is `True`.  In this case streamed
+        means that there is no information about the number of iterations.
+        This is usually `True` if a generator is passed to the response object.
+
+        This is useful for checking before applying some sort of post
+        filtering that should not take place for streamed responses.
+        """
+        try:
+            len(self.response)
+        except (TypeError, AttributeError):
+            return True
+        return False
+
+    @property
+    def is_sequence(self):
+        """If the iterator is buffered, this property will be `True`.  A
+        response object will consider an iterator to be buffered if the
+        response attribute is a list or tuple.
+
+        .. versionadded:: 0.6
+        """
+        return isinstance(self.response, (tuple, list))
+
+    def close(self):
+        """Close the wrapped response if possible.  You can also use the object
+        in a with statement which will automatically close it.
+
+        .. versionadded:: 0.9
+           Can now be used in a with statement.
+        """
+        if hasattr(self.response, "close"):
+            self.response.close()
+        for func in self._on_close:
+            func()
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, tb):
+        self.close()
+
+    def freeze(self):
+        """Call this method if you want to make your response object ready for
+        being pickled.  This buffers the generator if there is one.  It will
+        also set the `Content-Length` header to the length of the body.
+
+        .. versionchanged:: 0.6
+           The `Content-Length` header is now set.
+        """
+        # we explicitly set the length to a list of the *encoded* response
+        # iterator.  Even if the implicit sequence conversion is disabled.
+        self.response = list(self.iter_encoded())
+        self.headers["Content-Length"] = str(sum(map(len, self.response)))
+
+    def get_wsgi_headers(self, environ):
+        """This is automatically called right before the response is started
+        and returns headers modified for the given environment.  It returns a
+        copy of the headers from the response with some modifications applied
+        if necessary.
+
+        For example the location header (if present) is joined with the root
+        URL of the environment.  Also the content length is automatically set
+        to zero here for certain status codes.
+
+        .. versionchanged:: 0.6
+           Previously that function was called `fix_headers` and modified
+           the response object in place.  Also since 0.6, IRIs in location
+           and content-location headers are handled properly.
+
+           Also starting with 0.6, Werkzeug will attempt to set the content
+           length if it is able to figure it out on its own.  This is the
+           case if all the strings in the response iterable are already
+           encoded and the iterable is buffered.
+
+        :param environ: the WSGI environment of the request.
+        :return: returns a new :class:`~werkzeug.datastructures.Headers`
+                 object.
+        """
+        headers = Headers(self.headers)
+        location = None
+        content_location = None
+        content_length = None
+        status = self.status_code
+
+        # iterate over the headers to find all values in one go.  Because
+        # get_wsgi_headers is used each response that gives us a tiny
+        # speedup.
+        for key, value in headers:
+            ikey = key.lower()
+            if ikey == u"location":
+                location = value
+            elif ikey == u"content-location":
+                content_location = value
+            elif ikey == u"content-length":
+                content_length = value
+
+        # make sure the location header is an absolute URL
+        if location is not None:
+            old_location = location
+            if isinstance(location, text_type):
+                # Safe conversion is necessary here as we might redirect
+                # to a broken URI scheme (for instance itms-services).
+                location = iri_to_uri(location, safe_conversion=True)
+
+            if self.autocorrect_location_header:
+                current_url = get_current_url(environ, strip_querystring=True)
+                if isinstance(current_url, text_type):
+                    current_url = iri_to_uri(current_url)
+                location = url_join(current_url, location)
+            if location != old_location:
+                headers["Location"] = location
+
+        # make sure the content location is a URL
+        if content_location is not None and isinstance(content_location, text_type):
+            headers["Content-Location"] = iri_to_uri(content_location)
+
+        if 100 <= status < 200 or status == 204:
+            # Per section 3.3.2 of RFC 7230, "a server MUST NOT send a
+            # Content-Length header field in any response with a status
+            # code of 1xx (Informational) or 204 (No Content)."
+            headers.remove("Content-Length")
+        elif status == 304:
+            remove_entity_headers(headers)
+
+        # if we can determine the content length automatically, we
+        # should try to do that.  But only if this does not involve
+        # flattening the iterator or encoding of unicode strings in
+        # the response.  We however should not do that if we have a 304
+        # response.
+        if (
+            self.automatically_set_content_length
+            and self.is_sequence
+            and content_length is None
+            and status not in (204, 304)
+            and not (100 <= status < 200)
+        ):
+            try:
+                content_length = sum(len(to_bytes(x, "ascii")) for x in self.response)
+            except UnicodeError:
+                # aha, something non-bytestringy in there, too bad, we
+                # can't safely figure out the length of the response.
+                pass
+            else:
+                headers["Content-Length"] = str(content_length)
+
+        return headers
+
+    def get_app_iter(self, environ):
+        """Returns the application iterator for the given environ.  Depending
+        on the request method and the current status code the return value
+        might be an empty response rather than the one from the response.
+
+        If the request method is `HEAD` or the status code is in a range
+        where the HTTP specification requires an empty response, an empty
+        iterable is returned.
+
+        .. versionadded:: 0.6
+
+        :param environ: the WSGI environment of the request.
+        :return: a response iterable.
+        """
+        status = self.status_code
+        if (
+            environ["REQUEST_METHOD"] == "HEAD"
+            or 100 <= status < 200
+            or status in (204, 304)
+        ):
+            iterable = ()
+        elif self.direct_passthrough:
+            if __debug__:
+                _warn_if_string(self.response)
+            return self.response
+        else:
+            iterable = self.iter_encoded()
+        return ClosingIterator(iterable, self.close)
+
+    def get_wsgi_response(self, environ):
+        """Returns the final WSGI response as tuple.  The first item in
+        the tuple is the application iterator, the second the status and
+        the third the list of headers.  The response returned is created
+        specially for the given environment.  For example if the request
+        method in the WSGI environment is ``'HEAD'`` the response will
+        be empty and only the headers and status code will be present.
+
+        .. versionadded:: 0.6
+
+        :param environ: the WSGI environment of the request.
+        :return: an ``(app_iter, status, headers)`` tuple.
+        """
+        headers = self.get_wsgi_headers(environ)
+        app_iter = self.get_app_iter(environ)
+        return app_iter, self.status, headers.to_wsgi_list()
+
+    def __call__(self, environ, start_response):
+        """Process this response as WSGI application.
+
+        :param environ: the WSGI environment.
+        :param start_response: the response callable provided by the WSGI
+                               server.
+        :return: an application iterator
+        """
+        app_iter, status, headers = self.get_wsgi_response(environ)
+        start_response(status, headers)
+        return app_iter
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/common_descriptors.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/common_descriptors.py
new file mode 100644
index 0000000..e4107ee
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/common_descriptors.py
@@ -0,0 +1,322 @@
+from datetime import datetime
+from datetime import timedelta
+
+from .._compat import string_types
+from ..datastructures import CallbackDict
+from ..http import dump_age
+from ..http import dump_header
+from ..http import dump_options_header
+from ..http import http_date
+from ..http import parse_age
+from ..http import parse_date
+from ..http import parse_options_header
+from ..http import parse_set_header
+from ..utils import cached_property
+from ..utils import environ_property
+from ..utils import get_content_type
+from ..utils import header_property
+from ..wsgi import get_content_length
+
+
+class CommonRequestDescriptorsMixin(object):
+    """A mixin for :class:`BaseRequest` subclasses.  Request objects that
+    mix this class in will automatically get descriptors for a couple of
+    HTTP headers with automatic type conversion.
+
+    .. versionadded:: 0.5
+    """
+
+    content_type = environ_property(
+        "CONTENT_TYPE",
+        doc="""The Content-Type entity-header field indicates the media
+        type of the entity-body sent to the recipient or, in the case of
+        the HEAD method, the media type that would have been sent had
+        the request been a GET.""",
+    )
+
+    @cached_property
+    def content_length(self):
+        """The Content-Length entity-header field indicates the size of the
+        entity-body in bytes or, in the case of the HEAD method, the size of
+        the entity-body that would have been sent had the request been a
+        GET.
+        """
+        return get_content_length(self.environ)
+
+    content_encoding = environ_property(
+        "HTTP_CONTENT_ENCODING",
+        doc="""The Content-Encoding entity-header field is used as a
+        modifier to the media-type. When present, its value indicates
+        what additional content codings have been applied to the
+        entity-body, and thus what decoding mechanisms must be applied
+        in order to obtain the media-type referenced by the Content-Type
+        header field.
+
+        .. versionadded:: 0.9""",
+    )
+    content_md5 = environ_property(
+        "HTTP_CONTENT_MD5",
+        doc="""The Content-MD5 entity-header field, as defined in
+        RFC 1864, is an MD5 digest of the entity-body for the purpose of
+        providing an end-to-end message integrity check (MIC) of the
+        entity-body. (Note: a MIC is good for detecting accidental
+        modification of the entity-body in transit, but is not proof
+        against malicious attacks.)
+
+        .. versionadded:: 0.9""",
+    )
+    referrer = environ_property(
+        "HTTP_REFERER",
+        doc="""The Referer[sic] request-header field allows the client
+        to specify, for the server's benefit, the address (URI) of the
+        resource from which the Request-URI was obtained (the
+        "referrer", although the header field is misspelled).""",
+    )
+    date = environ_property(
+        "HTTP_DATE",
+        None,
+        parse_date,
+        doc="""The Date general-header field represents the date and
+        time at which the message was originated, having the same
+        semantics as orig-date in RFC 822.""",
+    )
+    max_forwards = environ_property(
+        "HTTP_MAX_FORWARDS",
+        None,
+        int,
+        doc="""The Max-Forwards request-header field provides a
+        mechanism with the TRACE and OPTIONS methods to limit the number
+        of proxies or gateways that can forward the request to the next
+        inbound server.""",
+    )
+
+    def _parse_content_type(self):
+        if not hasattr(self, "_parsed_content_type"):
+            self._parsed_content_type = parse_options_header(
+                self.environ.get("CONTENT_TYPE", "")
+            )
+
+    @property
+    def mimetype(self):
+        """Like :attr:`content_type`, but without parameters (eg, without
+        charset, type etc.) and always lowercase.  For example if the content
+        type is ``text/HTML; charset=utf-8`` the mimetype would be
+        ``'text/html'``.
+        """
+        self._parse_content_type()
+        return self._parsed_content_type[0].lower()
+
+    @property
+    def mimetype_params(self):
+        """The mimetype parameters as dict.  For example if the content
+        type is ``text/html; charset=utf-8`` the params would be
+        ``{'charset': 'utf-8'}``.
+        """
+        self._parse_content_type()
+        return self._parsed_content_type[1]
+
+    @cached_property
+    def pragma(self):
+        """The Pragma general-header field is used to include
+        implementation-specific directives that might apply to any recipient
+        along the request/response chain.  All pragma directives specify
+        optional behavior from the viewpoint of the protocol; however, some
+        systems MAY require that behavior be consistent with the directives.
+        """
+        return parse_set_header(self.environ.get("HTTP_PRAGMA", ""))
+
+
+class CommonResponseDescriptorsMixin(object):
+    """A mixin for :class:`BaseResponse` subclasses.  Response objects that
+    mix this class in will automatically get descriptors for a couple of
+    HTTP headers with automatic type conversion.
+    """
+
+    @property
+    def mimetype(self):
+        """The mimetype (content type without charset etc.)"""
+        ct = self.headers.get("content-type")
+        if ct:
+            return ct.split(";")[0].strip()
+
+    @mimetype.setter
+    def mimetype(self, value):
+        self.headers["Content-Type"] = get_content_type(value, self.charset)
+
+    @property
+    def mimetype_params(self):
+        """The mimetype parameters as dict. For example if the
+        content type is ``text/html; charset=utf-8`` the params would be
+        ``{'charset': 'utf-8'}``.
+
+        .. versionadded:: 0.5
+        """
+
+        def on_update(d):
+            self.headers["Content-Type"] = dump_options_header(self.mimetype, d)
+
+        d = parse_options_header(self.headers.get("content-type", ""))[1]
+        return CallbackDict(d, on_update)
+
+    location = header_property(
+        "Location",
+        doc="""The Location response-header field is used to redirect
+        the recipient to a location other than the Request-URI for
+        completion of the request or identification of a new
+        resource.""",
+    )
+    age = header_property(
+        "Age",
+        None,
+        parse_age,
+        dump_age,
+        doc="""The Age response-header field conveys the sender's
+        estimate of the amount of time since the response (or its
+        revalidation) was generated at the origin server.
+
+        Age values are non-negative decimal integers, representing time
+        in seconds.""",
+    )
+    content_type = header_property(
+        "Content-Type",
+        doc="""The Content-Type entity-header field indicates the media
+        type of the entity-body sent to the recipient or, in the case of
+        the HEAD method, the media type that would have been sent had
+        the request been a GET.""",
+    )
+    content_length = header_property(
+        "Content-Length",
+        None,
+        int,
+        str,
+        doc="""The Content-Length entity-header field indicates the size
+        of the entity-body, in decimal number of OCTETs, sent to the
+        recipient or, in the case of the HEAD method, the size of the
+        entity-body that would have been sent had the request been a
+        GET.""",
+    )
+    content_location = header_property(
+        "Content-Location",
+        doc="""The Content-Location entity-header field MAY be used to
+        supply the resource location for the entity enclosed in the
+        message when that entity is accessible from a location separate
+        from the requested resource's URI.""",
+    )
+    content_encoding = header_property(
+        "Content-Encoding",
+        doc="""The Content-Encoding entity-header field is used as a
+        modifier to the media-type. When present, its value indicates
+        what additional content codings have been applied to the
+        entity-body, and thus what decoding mechanisms must be applied
+        in order to obtain the media-type referenced by the Content-Type
+        header field.""",
+    )
+    content_md5 = header_property(
+        "Content-MD5",
+        doc="""The Content-MD5 entity-header field, as defined in
+        RFC 1864, is an MD5 digest of the entity-body for the purpose of
+        providing an end-to-end message integrity check (MIC) of the
+        entity-body. (Note: a MIC is good for detecting accidental
+        modification of the entity-body in transit, but is not proof
+        against malicious attacks.)""",
+    )
+    date = header_property(
+        "Date",
+        None,
+        parse_date,
+        http_date,
+        doc="""The Date general-header field represents the date and
+        time at which the message was originated, having the same
+        semantics as orig-date in RFC 822.""",
+    )
+    expires = header_property(
+        "Expires",
+        None,
+        parse_date,
+        http_date,
+        doc="""The Expires entity-header field gives the date/time after
+        which the response is considered stale. A stale cache entry may
+        not normally be returned by a cache.""",
+    )
+    last_modified = header_property(
+        "Last-Modified",
+        None,
+        parse_date,
+        http_date,
+        doc="""The Last-Modified entity-header field indicates the date
+        and time at which the origin server believes the variant was
+        last modified.""",
+    )
+
+    @property
+    def retry_after(self):
+        """The Retry-After response-header field can be used with a
+        503 (Service Unavailable) response to indicate how long the
+        service is expected to be unavailable to the requesting client.
+
+        Time in seconds until expiration or date.
+        """
+        value = self.headers.get("retry-after")
+        if value is None:
+            return
+        elif value.isdigit():
+            return datetime.utcnow() + timedelta(seconds=int(value))
+        return parse_date(value)
+
+    @retry_after.setter
+    def retry_after(self, value):
+        if value is None:
+            if "retry-after" in self.headers:
+                del self.headers["retry-after"]
+            return
+        elif isinstance(value, datetime):
+            value = http_date(value)
+        else:
+            value = str(value)
+        self.headers["Retry-After"] = value
+
+    def _set_property(name, doc=None):  # noqa: B902
+        def fget(self):
+            def on_update(header_set):
+                if not header_set and name in self.headers:
+                    del self.headers[name]
+                elif header_set:
+                    self.headers[name] = header_set.to_header()
+
+            return parse_set_header(self.headers.get(name), on_update)
+
+        def fset(self, value):
+            if not value:
+                del self.headers[name]
+            elif isinstance(value, string_types):
+                self.headers[name] = value
+            else:
+                self.headers[name] = dump_header(value)
+
+        return property(fget, fset, doc=doc)
+
+    vary = _set_property(
+        "Vary",
+        doc="""The Vary field value indicates the set of request-header
+        fields that fully determines, while the response is fresh,
+        whether a cache is permitted to use the response to reply to a
+        subsequent request without revalidation.""",
+    )
+    content_language = _set_property(
+        "Content-Language",
+        doc="""The Content-Language entity-header field describes the
+        natural language(s) of the intended audience for the enclosed
+        entity. Note that this might not be equivalent to all the
+        languages used within the entity-body.""",
+    )
+    allow = _set_property(
+        "Allow",
+        doc="""The Allow entity-header field lists the set of methods
+        supported by the resource identified by the Request-URI. The
+        purpose of this field is strictly to inform the recipient of
+        valid methods associated with the resource. An Allow header
+        field MUST be present in a 405 (Method Not Allowed)
+        response.""",
+    )
+
+    del _set_property
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/etag.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/etag.py
new file mode 100644
index 0000000..0733506
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/etag.py
@@ -0,0 +1,304 @@
+from .._compat import string_types
+from .._internal import _get_environ
+from ..datastructures import ContentRange
+from ..datastructures import RequestCacheControl
+from ..datastructures import ResponseCacheControl
+from ..http import generate_etag
+from ..http import http_date
+from ..http import is_resource_modified
+from ..http import parse_cache_control_header
+from ..http import parse_content_range_header
+from ..http import parse_date
+from ..http import parse_etags
+from ..http import parse_if_range_header
+from ..http import parse_range_header
+from ..http import quote_etag
+from ..http import unquote_etag
+from ..utils import cached_property
+from ..utils import header_property
+from ..wrappers.base_response import _clean_accept_ranges
+from ..wsgi import _RangeWrapper
+
+
+class ETagRequestMixin(object):
+    """Add entity tag and cache descriptors to a request object or object with
+    a WSGI environment available as :attr:`~BaseRequest.environ`.  This not
+    only provides access to etags but also to the cache control header.
+    """
+
+    @cached_property
+    def cache_control(self):
+        """A :class:`~werkzeug.datastructures.RequestCacheControl` object
+        for the incoming cache control headers.
+        """
+        cache_control = self.environ.get("HTTP_CACHE_CONTROL")
+        return parse_cache_control_header(cache_control, None, RequestCacheControl)
+
+    @cached_property
+    def if_match(self):
+        """An object containing all the etags in the `If-Match` header.
+
+        :rtype: :class:`~werkzeug.datastructures.ETags`
+        """
+        return parse_etags(self.environ.get("HTTP_IF_MATCH"))
+
+    @cached_property
+    def if_none_match(self):
+        """An object containing all the etags in the `If-None-Match` header.
+
+        :rtype: :class:`~werkzeug.datastructures.ETags`
+        """
+        return parse_etags(self.environ.get("HTTP_IF_NONE_MATCH"))
+
+    @cached_property
+    def if_modified_since(self):
+        """The parsed `If-Modified-Since` header as datetime object."""
+        return parse_date(self.environ.get("HTTP_IF_MODIFIED_SINCE"))
+
+    @cached_property
+    def if_unmodified_since(self):
+        """The parsed `If-Unmodified-Since` header as datetime object."""
+        return parse_date(self.environ.get("HTTP_IF_UNMODIFIED_SINCE"))
+
+    @cached_property
+    def if_range(self):
+        """The parsed `If-Range` header.
+
+        .. versionadded:: 0.7
+
+        :rtype: :class:`~werkzeug.datastructures.IfRange`
+        """
+        return parse_if_range_header(self.environ.get("HTTP_IF_RANGE"))
+
+    @cached_property
+    def range(self):
+        """The parsed `Range` header.
+
+        .. versionadded:: 0.7
+
+        :rtype: :class:`~werkzeug.datastructures.Range`
+        """
+        return parse_range_header(self.environ.get("HTTP_RANGE"))
+
+
+class ETagResponseMixin(object):
+    """Adds extra functionality to a response object for etag and cache
+    handling.  This mixin requires an object with at least a `headers`
+    object that implements a dict like interface similar to
+    :class:`~werkzeug.datastructures.Headers`.
+
+    If you want the :meth:`freeze` method to automatically add an etag, you
+    have to mixin this method before the response base class.  The default
+    response class does not do that.
+    """
+
+    @property
+    def cache_control(self):
+        """The Cache-Control general-header field is used to specify
+        directives that MUST be obeyed by all caching mechanisms along the
+        request/response chain.
+        """
+
+        def on_update(cache_control):
+            if not cache_control and "cache-control" in self.headers:
+                del self.headers["cache-control"]
+            elif cache_control:
+                self.headers["Cache-Control"] = cache_control.to_header()
+
+        return parse_cache_control_header(
+            self.headers.get("cache-control"), on_update, ResponseCacheControl
+        )
+
+    def _wrap_response(self, start, length):
+        """Wrap existing Response in case of Range Request context."""
+        if self.status_code == 206:
+            self.response = _RangeWrapper(self.response, start, length)
+
+    def _is_range_request_processable(self, environ):
+        """Return ``True`` if `Range` header is present and if underlying
+        resource is considered unchanged when compared with `If-Range` header.
+        """
+        return (
+            "HTTP_IF_RANGE" not in environ
+            or not is_resource_modified(
+                environ,
+                self.headers.get("etag"),
+                None,
+                self.headers.get("last-modified"),
+                ignore_if_range=False,
+            )
+        ) and "HTTP_RANGE" in environ
+
+    def _process_range_request(self, environ, complete_length=None, accept_ranges=None):
+        """Handle Range Request related headers (RFC7233).  If `Accept-Ranges`
+        header is valid, and Range Request is processable, we set the headers
+        as described by the RFC, and wrap the underlying response in a
+        RangeWrapper.
+
+        Returns ``True`` if Range Request can be fulfilled, ``False`` otherwise.
+
+        :raises: :class:`~werkzeug.exceptions.RequestedRangeNotSatisfiable`
+                 if `Range` header could not be parsed or satisfied.
+        """
+        from ..exceptions import RequestedRangeNotSatisfiable
+
+        if accept_ranges is None:
+            return False
+        self.headers["Accept-Ranges"] = accept_ranges
+        if not self._is_range_request_processable(environ) or complete_length is None:
+            return False
+        parsed_range = parse_range_header(environ.get("HTTP_RANGE"))
+        if parsed_range is None:
+            raise RequestedRangeNotSatisfiable(complete_length)
+        range_tuple = parsed_range.range_for_length(complete_length)
+        content_range_header = parsed_range.to_content_range_header(complete_length)
+        if range_tuple is None or content_range_header is None:
+            raise RequestedRangeNotSatisfiable(complete_length)
+        content_length = range_tuple[1] - range_tuple[0]
+        # Be sure not to send 206 response
+        # if requested range is the full content.
+        if content_length != complete_length:
+            self.headers["Content-Length"] = content_length
+            self.content_range = content_range_header
+            self.status_code = 206
+            self._wrap_response(range_tuple[0], content_length)
+            return True
+        return False
+
+    def make_conditional(
+        self, request_or_environ, accept_ranges=False, complete_length=None
+    ):
+        """Make the response conditional to the request.  This method works
+        best if an etag was defined for the response already.  The `add_etag`
+        method can be used to do that.  If called without etag just the date
+        header is set.
+
+        This does nothing if the request method in the request or environ is
+        anything but GET or HEAD.
+
+        For optimal performance when handling range requests, it's recommended
+        that your response data object implements `seekable`, `seek` and `tell`
+        methods as described by :py:class:`io.IOBase`.  Objects returned by
+        :meth:`~werkzeug.wsgi.wrap_file` automatically implement those methods.
+
+        It does not remove the body of the response because that's something
+        the :meth:`__call__` function does for us automatically.
+
+        Returns self so that you can do ``return resp.make_conditional(req)``
+        but modifies the object in-place.
+
+        :param request_or_environ: a request object or WSGI environment to be
+                                   used to make the response conditional
+                                   against.
+        :param accept_ranges: This parameter dictates the value of
+                              `Accept-Ranges` header. If ``False`` (default),
+                              the header is not set. If ``True``, it will be set
+                              to ``"bytes"``. If ``None``, it will be set to
+                              ``"none"``. If it's a string, it will use this
+                              value.
+        :param complete_length: Will be used only in valid Range Requests.
+                                It will set `Content-Range` complete length
+                                value and compute `Content-Length` real value.
+                                This parameter is mandatory for successful
+                                Range Requests completion.
+        :raises: :class:`~werkzeug.exceptions.RequestedRangeNotSatisfiable`
+                 if `Range` header could not be parsed or satisfied.
+        """
+        environ = _get_environ(request_or_environ)
+        if environ["REQUEST_METHOD"] in ("GET", "HEAD"):
+            # if the date is not in the headers, add it now.  We however
+            # will not override an already existing header.  Unfortunately
+            # this header will be overriden by many WSGI servers including
+            # wsgiref.
+            if "date" not in self.headers:
+                self.headers["Date"] = http_date()
+            accept_ranges = _clean_accept_ranges(accept_ranges)
+            is206 = self._process_range_request(environ, complete_length, accept_ranges)
+            if not is206 and not is_resource_modified(
+                environ,
+                self.headers.get("etag"),
+                None,
+                self.headers.get("last-modified"),
+            ):
+                if parse_etags(environ.get("HTTP_IF_MATCH")):
+                    self.status_code = 412
+                else:
+                    self.status_code = 304
+            if (
+                self.automatically_set_content_length
+                and "content-length" not in self.headers
+            ):
+                length = self.calculate_content_length()
+                if length is not None:
+                    self.headers["Content-Length"] = length
+        return self
+
+    def add_etag(self, overwrite=False, weak=False):
+        """Add an etag for the current response if there is none yet."""
+        if overwrite or "etag" not in self.headers:
+            self.set_etag(generate_etag(self.get_data()), weak)
+
+    def set_etag(self, etag, weak=False):
+        """Set the etag, and override the old one if there was one."""
+        self.headers["ETag"] = quote_etag(etag, weak)
+
+    def get_etag(self):
+        """Return a tuple in the form ``(etag, is_weak)``.  If there is no
+        ETag the return value is ``(None, None)``.
+        """
+        return unquote_etag(self.headers.get("ETag"))
+
+    def freeze(self, no_etag=False):
+        """Call this method if you want to make your response object ready for
+        pickeling.  This buffers the generator if there is one.  This also
+        sets the etag unless `no_etag` is set to `True`.
+        """
+        if not no_etag:
+            self.add_etag()
+        super(ETagResponseMixin, self).freeze()
+
+    accept_ranges = header_property(
+        "Accept-Ranges",
+        doc="""The `Accept-Ranges` header. Even though the name would
+        indicate that multiple values are supported, it must be one
+        string token only.
+
+        The values ``'bytes'`` and ``'none'`` are common.
+
+        .. versionadded:: 0.7""",
+    )
+
+    def _get_content_range(self):
+        def on_update(rng):
+            if not rng:
+                del self.headers["content-range"]
+            else:
+                self.headers["Content-Range"] = rng.to_header()
+
+        rv = parse_content_range_header(self.headers.get("content-range"), on_update)
+        # always provide a content range object to make the descriptor
+        # more user friendly.  It provides an unset() method that can be
+        # used to remove the header quickly.
+        if rv is None:
+            rv = ContentRange(None, None, None, on_update=on_update)
+        return rv
+
+    def _set_content_range(self, value):
+        if not value:
+            del self.headers["content-range"]
+        elif isinstance(value, string_types):
+            self.headers["Content-Range"] = value
+        else:
+            self.headers["Content-Range"] = value.to_header()
+
+    content_range = property(
+        _get_content_range,
+        _set_content_range,
+        doc="""The ``Content-Range`` header as
+        :class:`~werkzeug.datastructures.ContentRange` object. Even if
+        the header is not set it wil provide such an object for easier
+        manipulation.
+
+        .. versionadded:: 0.7""",
+    )
+    del _get_content_range, _set_content_range
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/json.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/json.py
new file mode 100644
index 0000000..6d5dc33
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/json.py
@@ -0,0 +1,145 @@
+from __future__ import absolute_import
+
+import datetime
+import uuid
+
+from .._compat import text_type
+from ..exceptions import BadRequest
+from ..utils import detect_utf_encoding
+
+try:
+    import simplejson as _json
+except ImportError:
+    import json as _json
+
+
+class _JSONModule(object):
+    @staticmethod
+    def _default(o):
+        if isinstance(o, datetime.date):
+            return o.isoformat()
+
+        if isinstance(o, uuid.UUID):
+            return str(o)
+
+        if hasattr(o, "__html__"):
+            return text_type(o.__html__())
+
+        raise TypeError()
+
+    @classmethod
+    def dumps(cls, obj, **kw):
+        kw.setdefault("separators", (",", ":"))
+        kw.setdefault("default", cls._default)
+        kw.setdefault("sort_keys", True)
+        return _json.dumps(obj, **kw)
+
+    @staticmethod
+    def loads(s, **kw):
+        if isinstance(s, bytes):
+            # Needed for Python < 3.6
+            encoding = detect_utf_encoding(s)
+            s = s.decode(encoding)
+
+        return _json.loads(s, **kw)
+
+
+class JSONMixin(object):
+    """Mixin to parse :attr:`data` as JSON. Can be mixed in for both
+    :class:`~werkzeug.wrappers.Request` and
+    :class:`~werkzeug.wrappers.Response` classes.
+
+    If `simplejson`_ is installed it is preferred over Python's built-in
+    :mod:`json` module.
+
+    .. _simplejson: https://simplejson.readthedocs.io/en/latest/
+    """
+
+    #: A module or other object that has ``dumps`` and ``loads``
+    #: functions that match the API of the built-in :mod:`json` module.
+    json_module = _JSONModule
+
+    @property
+    def json(self):
+        """The parsed JSON data if :attr:`mimetype` indicates JSON
+        (:mimetype:`application/json`, see :meth:`is_json`).
+
+        Calls :meth:`get_json` with default arguments.
+        """
+        return self.get_json()
+
+    @property
+    def is_json(self):
+        """Check if the mimetype indicates JSON data, either
+        :mimetype:`application/json` or :mimetype:`application/*+json`.
+        """
+        mt = self.mimetype
+        return (
+            mt == "application/json"
+            or mt.startswith("application/")
+            and mt.endswith("+json")
+        )
+
+    def _get_data_for_json(self, cache):
+        try:
+            return self.get_data(cache=cache)
+        except TypeError:
+            # Response doesn't have cache param.
+            return self.get_data()
+
+    # Cached values for ``(silent=False, silent=True)``. Initialized
+    # with sentinel values.
+    _cached_json = (Ellipsis, Ellipsis)
+
+    def get_json(self, force=False, silent=False, cache=True):
+        """Parse :attr:`data` as JSON.
+
+        If the mimetype does not indicate JSON
+        (:mimetype:`application/json`, see :meth:`is_json`), this
+        returns ``None``.
+
+        If parsing fails, :meth:`on_json_loading_failed` is called and
+        its return value is used as the return value.
+
+        :param force: Ignore the mimetype and always try to parse JSON.
+        :param silent: Silence parsing errors and return ``None``
+            instead.
+        :param cache: Store the parsed JSON to return for subsequent
+            calls.
+        """
+        if cache and self._cached_json[silent] is not Ellipsis:
+            return self._cached_json[silent]
+
+        if not (force or self.is_json):
+            return None
+
+        data = self._get_data_for_json(cache=cache)
+
+        try:
+            rv = self.json_module.loads(data)
+        except ValueError as e:
+            if silent:
+                rv = None
+
+                if cache:
+                    normal_rv, _ = self._cached_json
+                    self._cached_json = (normal_rv, rv)
+            else:
+                rv = self.on_json_loading_failed(e)
+
+                if cache:
+                    _, silent_rv = self._cached_json
+                    self._cached_json = (rv, silent_rv)
+        else:
+            if cache:
+                self._cached_json = (rv, rv)
+
+        return rv
+
+    def on_json_loading_failed(self, e):
+        """Called if :meth:`get_json` parsing fails and isn't silenced.
+        If this method returns a value, it is used as the return value
+        for :meth:`get_json`. The default implementation raises
+        :exc:`~werkzeug.exceptions.BadRequest`.
+        """
+        raise BadRequest("Failed to decode JSON object: {0}".format(e))
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/request.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/request.py
new file mode 100644
index 0000000..d1c71b6
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/request.py
@@ -0,0 +1,44 @@
+from .accept import AcceptMixin
+from .auth import AuthorizationMixin
+from .base_request import BaseRequest
+from .common_descriptors import CommonRequestDescriptorsMixin
+from .etag import ETagRequestMixin
+from .user_agent import UserAgentMixin
+
+
+class Request(
+    BaseRequest,
+    AcceptMixin,
+    ETagRequestMixin,
+    UserAgentMixin,
+    AuthorizationMixin,
+    CommonRequestDescriptorsMixin,
+):
+    """Full featured request object implementing the following mixins:
+
+    - :class:`AcceptMixin` for accept header parsing
+    - :class:`ETagRequestMixin` for etag and cache control handling
+    - :class:`UserAgentMixin` for user agent introspection
+    - :class:`AuthorizationMixin` for http auth handling
+    - :class:`CommonRequestDescriptorsMixin` for common headers
+    """
+
+
+class StreamOnlyMixin(object):
+    """If mixed in before the request object this will change the bahavior
+    of it to disable handling of form parsing.  This disables the
+    :attr:`files`, :attr:`form` attributes and will just provide a
+    :attr:`stream` attribute that however is always available.
+
+    .. versionadded:: 0.9
+    """
+
+    disable_data_descriptor = True
+    want_form_data_parsed = False
+
+
+class PlainRequest(StreamOnlyMixin, Request):
+    """A request object without special form parsing capabilities.
+
+    .. versionadded:: 0.9
+    """
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/response.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/response.py
new file mode 100644
index 0000000..cd86cac
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/response.py
@@ -0,0 +1,78 @@
+from ..utils import cached_property
+from .auth import WWWAuthenticateMixin
+from .base_response import BaseResponse
+from .common_descriptors import CommonResponseDescriptorsMixin
+from .etag import ETagResponseMixin
+
+
+class ResponseStream(object):
+    """A file descriptor like object used by the :class:`ResponseStreamMixin` to
+    represent the body of the stream.  It directly pushes into the response
+    iterable of the response object.
+    """
+
+    mode = "wb+"
+
+    def __init__(self, response):
+        self.response = response
+        self.closed = False
+
+    def write(self, value):
+        if self.closed:
+            raise ValueError("I/O operation on closed file")
+        self.response._ensure_sequence(mutable=True)
+        self.response.response.append(value)
+        self.response.headers.pop("Content-Length", None)
+        return len(value)
+
+    def writelines(self, seq):
+        for item in seq:
+            self.write(item)
+
+    def close(self):
+        self.closed = True
+
+    def flush(self):
+        if self.closed:
+            raise ValueError("I/O operation on closed file")
+
+    def isatty(self):
+        if self.closed:
+            raise ValueError("I/O operation on closed file")
+        return False
+
+    def tell(self):
+        self.response._ensure_sequence()
+        return sum(map(len, self.response.response))
+
+    @property
+    def encoding(self):
+        return self.response.charset
+
+
+class ResponseStreamMixin(object):
+    """Mixin for :class:`BaseRequest` subclasses.  Classes that inherit from
+    this mixin will automatically get a :attr:`stream` property that provides
+    a write-only interface to the response iterable.
+    """
+
+    @cached_property
+    def stream(self):
+        """The response iterable as write-only stream."""
+        return ResponseStream(self)
+
+
+class Response(
+    BaseResponse,
+    ETagResponseMixin,
+    ResponseStreamMixin,
+    CommonResponseDescriptorsMixin,
+    WWWAuthenticateMixin,
+):
+    """Full featured response object implementing the following mixins:
+
+    - :class:`ETagResponseMixin` for etag and cache control handling
+    - :class:`ResponseStreamMixin` to add support for the `stream` property
+    - :class:`CommonResponseDescriptorsMixin` for various HTTP descriptors
+    - :class:`WWWAuthenticateMixin` for HTTP authentication support
+    """
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wrappers/user_agent.py b/venv/lib/python3.7/site-packages/werkzeug/wrappers/user_agent.py
new file mode 100644
index 0000000..72588dd
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wrappers/user_agent.py
@@ -0,0 +1,15 @@
+from ..utils import cached_property
+
+
+class UserAgentMixin(object):
+    """Adds a `user_agent` attribute to the request object which
+    contains the parsed user agent of the browser that triggered the
+    request as a :class:`~werkzeug.useragents.UserAgent` object.
+    """
+
+    @cached_property
+    def user_agent(self):
+        """The current user agent."""
+        from ..useragents import UserAgent
+
+        return UserAgent(self.environ)
diff --git a/venv/lib/python3.7/site-packages/werkzeug/wsgi.py b/venv/lib/python3.7/site-packages/werkzeug/wsgi.py
new file mode 100644
index 0000000..f069f2d
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/werkzeug/wsgi.py
@@ -0,0 +1,1067 @@
+# -*- coding: utf-8 -*-
+"""
+    werkzeug.wsgi
+    ~~~~~~~~~~~~~
+
+    This module implements WSGI related helpers.
+
+    :copyright: 2007 Pallets
+    :license: BSD-3-Clause
+"""
+import io
+import re
+import warnings
+from functools import partial
+from functools import update_wrapper
+from itertools import chain
+
+from ._compat import BytesIO
+from ._compat import implements_iterator
+from ._compat import make_literal_wrapper
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import to_bytes
+from ._compat import to_unicode
+from ._compat import try_coerce_native
+from ._compat import wsgi_get_bytes
+from ._internal import _encode_idna
+from .urls import uri_to_iri
+from .urls import url_join
+from .urls import url_parse
+from .urls import url_quote
+
+
+def responder(f):
+    """Marks a function as responder.  Decorate a function with it and it
+    will automatically call the return value as WSGI application.
+
+    Example::
+
+        @responder
+        def application(environ, start_response):
+            return Response('Hello World!')
+    """
+    return update_wrapper(lambda *a: f(*a)(*a[-2:]), f)
+
+
+def get_current_url(
+    environ,
+    root_only=False,
+    strip_querystring=False,
+    host_only=False,
+    trusted_hosts=None,
+):
+    """A handy helper function that recreates the full URL as IRI for the
+    current request or parts of it.  Here's an example:
+
+    >>> from werkzeug.test import create_environ
+    >>> env = create_environ("/?param=foo", "http://localhost/script")
+    >>> get_current_url(env)
+    'http://localhost/script/?param=foo'
+    >>> get_current_url(env, root_only=True)
+    'http://localhost/script/'
+    >>> get_current_url(env, host_only=True)
+    'http://localhost/'
+    >>> get_current_url(env, strip_querystring=True)
+    'http://localhost/script/'
+
+    This optionally it verifies that the host is in a list of trusted hosts.
+    If the host is not in there it will raise a
+    :exc:`~werkzeug.exceptions.SecurityError`.
+
+    Note that the string returned might contain unicode characters as the
+    representation is an IRI not an URI.  If you need an ASCII only
+    representation you can use the :func:`~werkzeug.urls.iri_to_uri`
+    function:
+
+    >>> from werkzeug.urls import iri_to_uri
+    >>> iri_to_uri(get_current_url(env))
+    'http://localhost/script/?param=foo'
+
+    :param environ: the WSGI environment to get the current URL from.
+    :param root_only: set `True` if you only want the root URL.
+    :param strip_querystring: set to `True` if you don't want the querystring.
+    :param host_only: set to `True` if the host URL should be returned.
+    :param trusted_hosts: a list of trusted hosts, see :func:`host_is_trusted`
+                          for more information.
+    """
+    tmp = [environ["wsgi.url_scheme"], "://", get_host(environ, trusted_hosts)]
+    cat = tmp.append
+    if host_only:
+        return uri_to_iri("".join(tmp) + "/")
+    cat(url_quote(wsgi_get_bytes(environ.get("SCRIPT_NAME", ""))).rstrip("/"))
+    cat("/")
+    if not root_only:
+        cat(url_quote(wsgi_get_bytes(environ.get("PATH_INFO", "")).lstrip(b"/")))
+        if not strip_querystring:
+            qs = get_query_string(environ)
+            if qs:
+                cat("?" + qs)
+    return uri_to_iri("".join(tmp))
+
+
+def host_is_trusted(hostname, trusted_list):
+    """Checks if a host is trusted against a list.  This also takes care
+    of port normalization.
+
+    .. versionadded:: 0.9
+
+    :param hostname: the hostname to check
+    :param trusted_list: a list of hostnames to check against.  If a
+                         hostname starts with a dot it will match against
+                         all subdomains as well.
+    """
+    if not hostname:
+        return False
+
+    if isinstance(trusted_list, string_types):
+        trusted_list = [trusted_list]
+
+    def _normalize(hostname):
+        if ":" in hostname:
+            hostname = hostname.rsplit(":", 1)[0]
+        return _encode_idna(hostname)
+
+    try:
+        hostname = _normalize(hostname)
+    except UnicodeError:
+        return False
+    for ref in trusted_list:
+        if ref.startswith("."):
+            ref = ref[1:]
+            suffix_match = True
+        else:
+            suffix_match = False
+        try:
+            ref = _normalize(ref)
+        except UnicodeError:
+            return False
+        if ref == hostname:
+            return True
+        if suffix_match and hostname.endswith(b"." + ref):
+            return True
+    return False
+
+
+def get_host(environ, trusted_hosts=None):
+    """Return the host for the given WSGI environment. This first checks
+    the ``Host`` header. If it's not present, then ``SERVER_NAME`` and
+    ``SERVER_PORT`` are used. The host will only contain the port if it
+    is different than the standard port for the protocol.
+
+    Optionally, verify that the host is trusted using
+    :func:`host_is_trusted` and raise a
+    :exc:`~werkzeug.exceptions.SecurityError` if it is not.
+
+    :param environ: The WSGI environment to get the host from.
+    :param trusted_hosts: A list of trusted hosts.
+    :return: Host, with port if necessary.
+    :raise ~werkzeug.exceptions.SecurityError: If the host is not
+        trusted.
+    """
+    if "HTTP_HOST" in environ:
+        rv = environ["HTTP_HOST"]
+        if environ["wsgi.url_scheme"] == "http" and rv.endswith(":80"):
+            rv = rv[:-3]
+        elif environ["wsgi.url_scheme"] == "https" and rv.endswith(":443"):
+            rv = rv[:-4]
+    else:
+        rv = environ["SERVER_NAME"]
+        if (environ["wsgi.url_scheme"], environ["SERVER_PORT"]) not in (
+            ("https", "443"),
+            ("http", "80"),
+        ):
+            rv += ":" + environ["SERVER_PORT"]
+    if trusted_hosts is not None:
+        if not host_is_trusted(rv, trusted_hosts):
+            from .exceptions import SecurityError
+
+            raise SecurityError('Host "%s" is not trusted' % rv)
+    return rv
+
+
+def get_content_length(environ):
+    """Returns the content length from the WSGI environment as
+    integer. If it's not available or chunked transfer encoding is used,
+    ``None`` is returned.
+
+    .. versionadded:: 0.9
+
+    :param environ: the WSGI environ to fetch the content length from.
+    """
+    if environ.get("HTTP_TRANSFER_ENCODING", "") == "chunked":
+        return None
+
+    content_length = environ.get("CONTENT_LENGTH")
+    if content_length is not None:
+        try:
+            return max(0, int(content_length))
+        except (ValueError, TypeError):
+            pass
+
+
+def get_input_stream(environ, safe_fallback=True):
+    """Returns the input stream from the WSGI environment and wraps it
+    in the most sensible way possible. The stream returned is not the
+    raw WSGI stream in most cases but one that is safe to read from
+    without taking into account the content length.
+
+    If content length is not set, the stream will be empty for safety reasons.
+    If the WSGI server supports chunked or infinite streams, it should set
+    the ``wsgi.input_terminated`` value in the WSGI environ to indicate that.
+
+    .. versionadded:: 0.9
+
+    :param environ: the WSGI environ to fetch the stream from.
+    :param safe_fallback: use an empty stream as a safe fallback when the
+        content length is not set. Disabling this allows infinite streams,
+        which can be a denial-of-service risk.
+    """
+    stream = environ["wsgi.input"]
+    content_length = get_content_length(environ)
+
+    # A wsgi extension that tells us if the input is terminated.  In
+    # that case we return the stream unchanged as we know we can safely
+    # read it until the end.
+    if environ.get("wsgi.input_terminated"):
+        return stream
+
+    # If the request doesn't specify a content length, returning the stream is
+    # potentially dangerous because it could be infinite, malicious or not. If
+    # safe_fallback is true, return an empty stream instead for safety.
+    if content_length is None:
+        return BytesIO() if safe_fallback else stream
+
+    # Otherwise limit the stream to the content length
+    return LimitedStream(stream, content_length)
+
+
+def get_query_string(environ):
+    """Returns the `QUERY_STRING` from the WSGI environment.  This also takes
+    care about the WSGI decoding dance on Python 3 environments as a
+    native string.  The string returned will be restricted to ASCII
+    characters.
+
+    .. versionadded:: 0.9
+
+    :param environ: the WSGI environment object to get the query string from.
+    """
+    qs = wsgi_get_bytes(environ.get("QUERY_STRING", ""))
+    # QUERY_STRING really should be ascii safe but some browsers
+    # will send us some unicode stuff (I am looking at you IE).
+    # In that case we want to urllib quote it badly.
+    return try_coerce_native(url_quote(qs, safe=":&%=+$!*'(),"))
+
+
+def get_path_info(environ, charset="utf-8", errors="replace"):
+    """Returns the `PATH_INFO` from the WSGI environment and properly
+    decodes it.  This also takes care about the WSGI decoding dance
+    on Python 3 environments.  if the `charset` is set to `None` a
+    bytestring is returned.
+
+    .. versionadded:: 0.9
+
+    :param environ: the WSGI environment object to get the path from.
+    :param charset: the charset for the path info, or `None` if no
+                    decoding should be performed.
+    :param errors: the decoding error handling.
+    """
+    path = wsgi_get_bytes(environ.get("PATH_INFO", ""))
+    return to_unicode(path, charset, errors, allow_none_charset=True)
+
+
+def get_script_name(environ, charset="utf-8", errors="replace"):
+    """Returns the `SCRIPT_NAME` from the WSGI environment and properly
+    decodes it.  This also takes care about the WSGI decoding dance
+    on Python 3 environments.  if the `charset` is set to `None` a
+    bytestring is returned.
+
+    .. versionadded:: 0.9
+
+    :param environ: the WSGI environment object to get the path from.
+    :param charset: the charset for the path, or `None` if no
+                    decoding should be performed.
+    :param errors: the decoding error handling.
+    """
+    path = wsgi_get_bytes(environ.get("SCRIPT_NAME", ""))
+    return to_unicode(path, charset, errors, allow_none_charset=True)
+
+
+def pop_path_info(environ, charset="utf-8", errors="replace"):
+    """Removes and returns the next segment of `PATH_INFO`, pushing it onto
+    `SCRIPT_NAME`.  Returns `None` if there is nothing left on `PATH_INFO`.
+
+    If the `charset` is set to `None` a bytestring is returned.
+
+    If there are empty segments (``'/foo//bar``) these are ignored but
+    properly pushed to the `SCRIPT_NAME`:
+
+    >>> env = {'SCRIPT_NAME': '/foo', 'PATH_INFO': '/a/b'}
+    >>> pop_path_info(env)
+    'a'
+    >>> env['SCRIPT_NAME']
+    '/foo/a'
+    >>> pop_path_info(env)
+    'b'
+    >>> env['SCRIPT_NAME']
+    '/foo/a/b'
+
+    .. versionadded:: 0.5
+
+    .. versionchanged:: 0.9
+       The path is now decoded and a charset and encoding
+       parameter can be provided.
+
+    :param environ: the WSGI environment that is modified.
+    """
+    path = environ.get("PATH_INFO")
+    if not path:
+        return None
+
+    script_name = environ.get("SCRIPT_NAME", "")
+
+    # shift multiple leading slashes over
+    old_path = path
+    path = path.lstrip("/")
+    if path != old_path:
+        script_name += "/" * (len(old_path) - len(path))
+
+    if "/" not in path:
+        environ["PATH_INFO"] = ""
+        environ["SCRIPT_NAME"] = script_name + path
+        rv = wsgi_get_bytes(path)
+    else:
+        segment, path = path.split("/", 1)
+        environ["PATH_INFO"] = "/" + path
+        environ["SCRIPT_NAME"] = script_name + segment
+        rv = wsgi_get_bytes(segment)
+
+    return to_unicode(rv, charset, errors, allow_none_charset=True)
+
+
+def peek_path_info(environ, charset="utf-8", errors="replace"):
+    """Returns the next segment on the `PATH_INFO` or `None` if there
+    is none.  Works like :func:`pop_path_info` without modifying the
+    environment:
+
+    >>> env = {'SCRIPT_NAME': '/foo', 'PATH_INFO': '/a/b'}
+    >>> peek_path_info(env)
+    'a'
+    >>> peek_path_info(env)
+    'a'
+
+    If the `charset` is set to `None` a bytestring is returned.
+
+    .. versionadded:: 0.5
+
+    .. versionchanged:: 0.9
+       The path is now decoded and a charset and encoding
+       parameter can be provided.
+
+    :param environ: the WSGI environment that is checked.
+    """
+    segments = environ.get("PATH_INFO", "").lstrip("/").split("/", 1)
+    if segments:
+        return to_unicode(
+            wsgi_get_bytes(segments[0]), charset, errors, allow_none_charset=True
+        )
+
+
+def extract_path_info(
+    environ_or_baseurl,
+    path_or_url,
+    charset="utf-8",
+    errors="werkzeug.url_quote",
+    collapse_http_schemes=True,
+):
+    """Extracts the path info from the given URL (or WSGI environment) and
+    path.  The path info returned is a unicode string, not a bytestring
+    suitable for a WSGI environment.  The URLs might also be IRIs.
+
+    If the path info could not be determined, `None` is returned.
+
+    Some examples:
+
+    >>> extract_path_info('http://example.com/app', '/app/hello')
+    u'/hello'
+    >>> extract_path_info('http://example.com/app',
+    ...                   'https://example.com/app/hello')
+    u'/hello'
+    >>> extract_path_info('http://example.com/app',
+    ...                   'https://example.com/app/hello',
+    ...                   collapse_http_schemes=False) is None
+    True
+
+    Instead of providing a base URL you can also pass a WSGI environment.
+
+    :param environ_or_baseurl: a WSGI environment dict, a base URL or
+                               base IRI.  This is the root of the
+                               application.
+    :param path_or_url: an absolute path from the server root, a
+                        relative path (in which case it's the path info)
+                        or a full URL.  Also accepts IRIs and unicode
+                        parameters.
+    :param charset: the charset for byte data in URLs
+    :param errors: the error handling on decode
+    :param collapse_http_schemes: if set to `False` the algorithm does
+                                  not assume that http and https on the
+                                  same server point to the same
+                                  resource.
+
+    .. versionchanged:: 0.15
+        The ``errors`` parameter defaults to leaving invalid bytes
+        quoted instead of replacing them.
+
+    .. versionadded:: 0.6
+    """
+
+    def _normalize_netloc(scheme, netloc):
+        parts = netloc.split(u"@", 1)[-1].split(u":", 1)
+        if len(parts) == 2:
+            netloc, port = parts
+            if (scheme == u"http" and port == u"80") or (
+                scheme == u"https" and port == u"443"
+            ):
+                port = None
+        else:
+            netloc = parts[0]
+            port = None
+        if port is not None:
+            netloc += u":" + port
+        return netloc
+
+    # make sure whatever we are working on is a IRI and parse it
+    path = uri_to_iri(path_or_url, charset, errors)
+    if isinstance(environ_or_baseurl, dict):
+        environ_or_baseurl = get_current_url(environ_or_baseurl, root_only=True)
+    base_iri = uri_to_iri(environ_or_baseurl, charset, errors)
+    base_scheme, base_netloc, base_path = url_parse(base_iri)[:3]
+    cur_scheme, cur_netloc, cur_path, = url_parse(url_join(base_iri, path))[:3]
+
+    # normalize the network location
+    base_netloc = _normalize_netloc(base_scheme, base_netloc)
+    cur_netloc = _normalize_netloc(cur_scheme, cur_netloc)
+
+    # is that IRI even on a known HTTP scheme?
+    if collapse_http_schemes:
+        for scheme in base_scheme, cur_scheme:
+            if scheme not in (u"http", u"https"):
+                return None
+    else:
+        if not (base_scheme in (u"http", u"https") and base_scheme == cur_scheme):
+            return None
+
+    # are the netlocs compatible?
+    if base_netloc != cur_netloc:
+        return None
+
+    # are we below the application path?
+    base_path = base_path.rstrip(u"/")
+    if not cur_path.startswith(base_path):
+        return None
+
+    return u"/" + cur_path[len(base_path) :].lstrip(u"/")
+
+
+@implements_iterator
+class ClosingIterator(object):
+    """The WSGI specification requires that all middlewares and gateways
+    respect the `close` callback of the iterable returned by the application.
+    Because it is useful to add another close action to a returned iterable
+    and adding a custom iterable is a boring task this class can be used for
+    that::
+
+        return ClosingIterator(app(environ, start_response), [cleanup_session,
+                                                              cleanup_locals])
+
+    If there is just one close function it can be passed instead of the list.
+
+    A closing iterator is not needed if the application uses response objects
+    and finishes the processing if the response is started::
+
+        try:
+            return response(environ, start_response)
+        finally:
+            cleanup_session()
+            cleanup_locals()
+    """
+
+    def __init__(self, iterable, callbacks=None):
+        iterator = iter(iterable)
+        self._next = partial(next, iterator)
+        if callbacks is None:
+            callbacks = []
+        elif callable(callbacks):
+            callbacks = [callbacks]
+        else:
+            callbacks = list(callbacks)
+        iterable_close = getattr(iterable, "close", None)
+        if iterable_close:
+            callbacks.insert(0, iterable_close)
+        self._callbacks = callbacks
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self._next()
+
+    def close(self):
+        for callback in self._callbacks:
+            callback()
+
+
+def wrap_file(environ, file, buffer_size=8192):
+    """Wraps a file.  This uses the WSGI server's file wrapper if available
+    or otherwise the generic :class:`FileWrapper`.
+
+    .. versionadded:: 0.5
+
+    If the file wrapper from the WSGI server is used it's important to not
+    iterate over it from inside the application but to pass it through
+    unchanged.  If you want to pass out a file wrapper inside a response
+    object you have to set :attr:`~BaseResponse.direct_passthrough` to `True`.
+
+    More information about file wrappers are available in :pep:`333`.
+
+    :param file: a :class:`file`-like object with a :meth:`~file.read` method.
+    :param buffer_size: number of bytes for one iteration.
+    """
+    return environ.get("wsgi.file_wrapper", FileWrapper)(file, buffer_size)
+
+
+@implements_iterator
+class FileWrapper(object):
+    """This class can be used to convert a :class:`file`-like object into
+    an iterable.  It yields `buffer_size` blocks until the file is fully
+    read.
+
+    You should not use this class directly but rather use the
+    :func:`wrap_file` function that uses the WSGI server's file wrapper
+    support if it's available.
+
+    .. versionadded:: 0.5
+
+    If you're using this object together with a :class:`BaseResponse` you have
+    to use the `direct_passthrough` mode.
+
+    :param file: a :class:`file`-like object with a :meth:`~file.read` method.
+    :param buffer_size: number of bytes for one iteration.
+    """
+
+    def __init__(self, file, buffer_size=8192):
+        self.file = file
+        self.buffer_size = buffer_size
+
+    def close(self):
+        if hasattr(self.file, "close"):
+            self.file.close()
+
+    def seekable(self):
+        if hasattr(self.file, "seekable"):
+            return self.file.seekable()
+        if hasattr(self.file, "seek"):
+            return True
+        return False
+
+    def seek(self, *args):
+        if hasattr(self.file, "seek"):
+            self.file.seek(*args)
+
+    def tell(self):
+        if hasattr(self.file, "tell"):
+            return self.file.tell()
+        return None
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        data = self.file.read(self.buffer_size)
+        if data:
+            return data
+        raise StopIteration()
+
+
+@implements_iterator
+class _RangeWrapper(object):
+    # private for now, but should we make it public in the future ?
+
+    """This class can be used to convert an iterable object into
+    an iterable that will only yield a piece of the underlying content.
+    It yields blocks until the underlying stream range is fully read.
+    The yielded blocks will have a size that can't exceed the original
+    iterator defined block size, but that can be smaller.
+
+    If you're using this object together with a :class:`BaseResponse` you have
+    to use the `direct_passthrough` mode.
+
+    :param iterable: an iterable object with a :meth:`__next__` method.
+    :param start_byte: byte from which read will start.
+    :param byte_range: how many bytes to read.
+    """
+
+    def __init__(self, iterable, start_byte=0, byte_range=None):
+        self.iterable = iter(iterable)
+        self.byte_range = byte_range
+        self.start_byte = start_byte
+        self.end_byte = None
+        if byte_range is not None:
+            self.end_byte = self.start_byte + self.byte_range
+        self.read_length = 0
+        self.seekable = hasattr(iterable, "seekable") and iterable.seekable()
+        self.end_reached = False
+
+    def __iter__(self):
+        return self
+
+    def _next_chunk(self):
+        try:
+            chunk = next(self.iterable)
+            self.read_length += len(chunk)
+            return chunk
+        except StopIteration:
+            self.end_reached = True
+            raise
+
+    def _first_iteration(self):
+        chunk = None
+        if self.seekable:
+            self.iterable.seek(self.start_byte)
+            self.read_length = self.iterable.tell()
+            contextual_read_length = self.read_length
+        else:
+            while self.read_length <= self.start_byte:
+                chunk = self._next_chunk()
+            if chunk is not None:
+                chunk = chunk[self.start_byte - self.read_length :]
+            contextual_read_length = self.start_byte
+        return chunk, contextual_read_length
+
+    def _next(self):
+        if self.end_reached:
+            raise StopIteration()
+        chunk = None
+        contextual_read_length = self.read_length
+        if self.read_length == 0:
+            chunk, contextual_read_length = self._first_iteration()
+        if chunk is None:
+            chunk = self._next_chunk()
+        if self.end_byte is not None and self.read_length >= self.end_byte:
+            self.end_reached = True
+            return chunk[: self.end_byte - contextual_read_length]
+        return chunk
+
+    def __next__(self):
+        chunk = self._next()
+        if chunk:
+            return chunk
+        self.end_reached = True
+        raise StopIteration()
+
+    def close(self):
+        if hasattr(self.iterable, "close"):
+            self.iterable.close()
+
+
+def _make_chunk_iter(stream, limit, buffer_size):
+    """Helper for the line and chunk iter functions."""
+    if isinstance(stream, (bytes, bytearray, text_type)):
+        raise TypeError(
+            "Passed a string or byte object instead of true iterator or stream."
+        )
+    if not hasattr(stream, "read"):
+        for item in stream:
+            if item:
+                yield item
+        return
+    if not isinstance(stream, LimitedStream) and limit is not None:
+        stream = LimitedStream(stream, limit)
+    _read = stream.read
+    while 1:
+        item = _read(buffer_size)
+        if not item:
+            break
+        yield item
+
+
+def make_line_iter(stream, limit=None, buffer_size=10 * 1024, cap_at_buffer=False):
+    """Safely iterates line-based over an input stream.  If the input stream
+    is not a :class:`LimitedStream` the `limit` parameter is mandatory.
+
+    This uses the stream's :meth:`~file.read` method internally as opposite
+    to the :meth:`~file.readline` method that is unsafe and can only be used
+    in violation of the WSGI specification.  The same problem applies to the
+    `__iter__` function of the input stream which calls :meth:`~file.readline`
+    without arguments.
+
+    If you need line-by-line processing it's strongly recommended to iterate
+    over the input stream using this helper function.
+
+    .. versionchanged:: 0.8
+       This function now ensures that the limit was reached.
+
+    .. versionadded:: 0.9
+       added support for iterators as input stream.
+
+    .. versionadded:: 0.11.10
+       added support for the `cap_at_buffer` parameter.
+
+    :param stream: the stream or iterate to iterate over.
+    :param limit: the limit in bytes for the stream.  (Usually
+                  content length.  Not necessary if the `stream`
+                  is a :class:`LimitedStream`.
+    :param buffer_size: The optional buffer size.
+    :param cap_at_buffer: if this is set chunks are split if they are longer
+                          than the buffer size.  Internally this is implemented
+                          that the buffer size might be exhausted by a factor
+                          of two however.
+    """
+    _iter = _make_chunk_iter(stream, limit, buffer_size)
+
+    first_item = next(_iter, "")
+    if not first_item:
+        return
+
+    s = make_literal_wrapper(first_item)
+    empty = s("")
+    cr = s("\r")
+    lf = s("\n")
+    crlf = s("\r\n")
+
+    _iter = chain((first_item,), _iter)
+
+    def _iter_basic_lines():
+        _join = empty.join
+        buffer = []
+        while 1:
+            new_data = next(_iter, "")
+            if not new_data:
+                break
+            new_buf = []
+            buf_size = 0
+            for item in chain(buffer, new_data.splitlines(True)):
+                new_buf.append(item)
+                buf_size += len(item)
+                if item and item[-1:] in crlf:
+                    yield _join(new_buf)
+                    new_buf = []
+                elif cap_at_buffer and buf_size >= buffer_size:
+                    rv = _join(new_buf)
+                    while len(rv) >= buffer_size:
+                        yield rv[:buffer_size]
+                        rv = rv[buffer_size:]
+                    new_buf = [rv]
+            buffer = new_buf
+        if buffer:
+            yield _join(buffer)
+
+    # This hackery is necessary to merge 'foo\r' and '\n' into one item
+    # of 'foo\r\n' if we were unlucky and we hit a chunk boundary.
+    previous = empty
+    for item in _iter_basic_lines():
+        if item == lf and previous[-1:] == cr:
+            previous += item
+            item = empty
+        if previous:
+            yield previous
+        previous = item
+    if previous:
+        yield previous
+
+
+def make_chunk_iter(
+    stream, separator, limit=None, buffer_size=10 * 1024, cap_at_buffer=False
+):
+    """Works like :func:`make_line_iter` but accepts a separator
+    which divides chunks.  If you want newline based processing
+    you should use :func:`make_line_iter` instead as it
+    supports arbitrary newline markers.
+
+    .. versionadded:: 0.8
+
+    .. versionadded:: 0.9
+       added support for iterators as input stream.
+
+    .. versionadded:: 0.11.10
+       added support for the `cap_at_buffer` parameter.
+
+    :param stream: the stream or iterate to iterate over.
+    :param separator: the separator that divides chunks.
+    :param limit: the limit in bytes for the stream.  (Usually
+                  content length.  Not necessary if the `stream`
+                  is otherwise already limited).
+    :param buffer_size: The optional buffer size.
+    :param cap_at_buffer: if this is set chunks are split if they are longer
+                          than the buffer size.  Internally this is implemented
+                          that the buffer size might be exhausted by a factor
+                          of two however.
+    """
+    _iter = _make_chunk_iter(stream, limit, buffer_size)
+
+    first_item = next(_iter, "")
+    if not first_item:
+        return
+
+    _iter = chain((first_item,), _iter)
+    if isinstance(first_item, text_type):
+        separator = to_unicode(separator)
+        _split = re.compile(r"(%s)" % re.escape(separator)).split
+        _join = u"".join
+    else:
+        separator = to_bytes(separator)
+        _split = re.compile(b"(" + re.escape(separator) + b")").split
+        _join = b"".join
+
+    buffer = []
+    while 1:
+        new_data = next(_iter, "")
+        if not new_data:
+            break
+        chunks = _split(new_data)
+        new_buf = []
+        buf_size = 0
+        for item in chain(buffer, chunks):
+            if item == separator:
+                yield _join(new_buf)
+                new_buf = []
+                buf_size = 0
+            else:
+                buf_size += len(item)
+                new_buf.append(item)
+
+                if cap_at_buffer and buf_size >= buffer_size:
+                    rv = _join(new_buf)
+                    while len(rv) >= buffer_size:
+                        yield rv[:buffer_size]
+                        rv = rv[buffer_size:]
+                    new_buf = [rv]
+                    buf_size = len(rv)
+
+        buffer = new_buf
+    if buffer:
+        yield _join(buffer)
+
+
+@implements_iterator
+class LimitedStream(io.IOBase):
+    """Wraps a stream so that it doesn't read more than n bytes.  If the
+    stream is exhausted and the caller tries to get more bytes from it
+    :func:`on_exhausted` is called which by default returns an empty
+    string.  The return value of that function is forwarded
+    to the reader function.  So if it returns an empty string
+    :meth:`read` will return an empty string as well.
+
+    The limit however must never be higher than what the stream can
+    output.  Otherwise :meth:`readlines` will try to read past the
+    limit.
+
+    .. admonition:: Note on WSGI compliance
+
+       calls to :meth:`readline` and :meth:`readlines` are not
+       WSGI compliant because it passes a size argument to the
+       readline methods.  Unfortunately the WSGI PEP is not safely
+       implementable without a size argument to :meth:`readline`
+       because there is no EOF marker in the stream.  As a result
+       of that the use of :meth:`readline` is discouraged.
+
+       For the same reason iterating over the :class:`LimitedStream`
+       is not portable.  It internally calls :meth:`readline`.
+
+       We strongly suggest using :meth:`read` only or using the
+       :func:`make_line_iter` which safely iterates line-based
+       over a WSGI input stream.
+
+    :param stream: the stream to wrap.
+    :param limit: the limit for the stream, must not be longer than
+                  what the string can provide if the stream does not
+                  end with `EOF` (like `wsgi.input`)
+    """
+
+    def __init__(self, stream, limit):
+        self._read = stream.read
+        self._readline = stream.readline
+        self._pos = 0
+        self.limit = limit
+
+    def __iter__(self):
+        return self
+
+    @property
+    def is_exhausted(self):
+        """If the stream is exhausted this attribute is `True`."""
+        return self._pos >= self.limit
+
+    def on_exhausted(self):
+        """This is called when the stream tries to read past the limit.
+        The return value of this function is returned from the reading
+        function.
+        """
+        # Read null bytes from the stream so that we get the
+        # correct end of stream marker.
+        return self._read(0)
+
+    def on_disconnect(self):
+        """What should happen if a disconnect is detected?  The return
+        value of this function is returned from read functions in case
+        the client went away.  By default a
+        :exc:`~werkzeug.exceptions.ClientDisconnected` exception is raised.
+        """
+        from .exceptions import ClientDisconnected
+
+        raise ClientDisconnected()
+
+    def exhaust(self, chunk_size=1024 * 64):
+        """Exhaust the stream.  This consumes all the data left until the
+        limit is reached.
+
+        :param chunk_size: the size for a chunk.  It will read the chunk
+                           until the stream is exhausted and throw away
+                           the results.
+        """
+        to_read = self.limit - self._pos
+        chunk = chunk_size
+        while to_read > 0:
+            chunk = min(to_read, chunk)
+            self.read(chunk)
+            to_read -= chunk
+
+    def read(self, size=None):
+        """Read `size` bytes or if size is not provided everything is read.
+
+        :param size: the number of bytes read.
+        """
+        if self._pos >= self.limit:
+            return self.on_exhausted()
+        if size is None or size == -1:  # -1 is for consistence with file
+            size = self.limit
+        to_read = min(self.limit - self._pos, size)
+        try:
+            read = self._read(to_read)
+        except (IOError, ValueError):
+            return self.on_disconnect()
+        if to_read and len(read) != to_read:
+            return self.on_disconnect()
+        self._pos += len(read)
+        return read
+
+    def readline(self, size=None):
+        """Reads one line from the stream."""
+        if self._pos >= self.limit:
+            return self.on_exhausted()
+        if size is None:
+            size = self.limit - self._pos
+        else:
+            size = min(size, self.limit - self._pos)
+        try:
+            line = self._readline(size)
+        except (ValueError, IOError):
+            return self.on_disconnect()
+        if size and not line:
+            return self.on_disconnect()
+        self._pos += len(line)
+        return line
+
+    def readlines(self, size=None):
+        """Reads a file into a list of strings.  It calls :meth:`readline`
+        until the file is read to the end.  It does support the optional
+        `size` argument if the underlaying stream supports it for
+        `readline`.
+        """
+        last_pos = self._pos
+        result = []
+        if size is not None:
+            end = min(self.limit, last_pos + size)
+        else:
+            end = self.limit
+        while 1:
+            if size is not None:
+                size -= last_pos - self._pos
+            if self._pos >= end:
+                break
+            result.append(self.readline(size))
+            if size is not None:
+                last_pos = self._pos
+        return result
+
+    def tell(self):
+        """Returns the position of the stream.
+
+        .. versionadded:: 0.9
+        """
+        return self._pos
+
+    def __next__(self):
+        line = self.readline()
+        if not line:
+            raise StopIteration()
+        return line
+
+    def readable(self):
+        return True
+
+
+# DEPRECATED
+from .middleware.dispatcher import DispatcherMiddleware as _DispatcherMiddleware
+from .middleware.http_proxy import ProxyMiddleware as _ProxyMiddleware
+from .middleware.shared_data import SharedDataMiddleware as _SharedDataMiddleware
+
+
+class ProxyMiddleware(_ProxyMiddleware):
+    """
+    .. deprecated:: 0.15
+        ``werkzeug.wsgi.ProxyMiddleware`` has moved to
+        :mod:`werkzeug.middleware.http_proxy`. This import will be
+        removed in 1.0.
+    """
+
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.wsgi.ProxyMiddleware' has moved to 'werkzeug"
+            ".middleware.http_proxy.ProxyMiddleware'. This import is"
+            " deprecated as of version 0.15 and will be removed in"
+            " version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(ProxyMiddleware, self).__init__(*args, **kwargs)
+
+
+class SharedDataMiddleware(_SharedDataMiddleware):
+    """
+    .. deprecated:: 0.15
+        ``werkzeug.wsgi.SharedDataMiddleware`` has moved to
+        :mod:`werkzeug.middleware.shared_data`. This import will be
+        removed in 1.0.
+    """
+
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.wsgi.SharedDataMiddleware' has moved to"
+            " 'werkzeug.middleware.shared_data.SharedDataMiddleware'."
+            " This import is deprecated as of version 0.15 and will be"
+            " removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(SharedDataMiddleware, self).__init__(*args, **kwargs)
+
+
+class DispatcherMiddleware(_DispatcherMiddleware):
+    """
+    .. deprecated:: 0.15
+        ``werkzeug.wsgi.DispatcherMiddleware`` has moved to
+        :mod:`werkzeug.middleware.dispatcher`. This import will be
+        removed in 1.0.
+    """
+
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "'werkzeug.wsgi.DispatcherMiddleware' has moved to"
+            " 'werkzeug.middleware.dispatcher.DispatcherMiddleware'."
+            " This import is deprecated as of version 0.15 and will be"
+            " removed in version 1.0.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        super(DispatcherMiddleware, self).__init__(*args, **kwargs)
diff --git a/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/PKG-INFO b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/PKG-INFO
new file mode 100644
index 0000000..6ff1ef8
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/PKG-INFO
@@ -0,0 +1,166 @@
+Metadata-Version: 1.1
+Name: wrapt
+Version: 1.11.1
+Summary: Module for decorators, wrappers and monkey patching.
+Home-page: https://github.com/GrahamDumpleton/wrapt
+Author: Graham Dumpleton
+Author-email: Graham.Dumpleton@gmail.com
+License: BSD
+Description: wrapt
+        =====
+        
+        |Travis| |AppVeyor| |Coveralls| |PyPI|
+        
+        The aim of the **wrapt** module is to provide a transparent object proxy
+        for Python, which can be used as the basis for the construction of function
+        wrappers and decorator functions.
+        
+        The **wrapt** module focuses very much on correctness. It therefore goes
+        way beyond existing mechanisms such as ``functools.wraps()`` to ensure that
+        decorators preserve introspectability, signatures, type checking abilities
+        etc. The decorators that can be constructed using this module will work in
+        far more scenarios than typical decorators and provide more predictable and
+        consistent behaviour.
+        
+        To ensure that the overhead is as minimal as possible, a C extension module
+        is used for performance critical components. An automatic fallback to a
+        pure Python implementation is also provided where a target system does not
+        have a compiler to allow the C extension to be compiled.
+        
+        Documentation
+        -------------
+        
+        For further information on the **wrapt** module see:
+        
+        * http://wrapt.readthedocs.org/
+        
+        Quick Start
+        -----------
+        
+        To implement your decorator you need to first define a wrapper function.
+        This will be called each time a decorated function is called. The wrapper
+        function needs to take four positional arguments:
+        
+        * ``wrapped`` - The wrapped function which in turns needs to be called by your wrapper function.
+        * ``instance`` - The object to which the wrapped function was bound when it was called.
+        * ``args`` - The list of positional arguments supplied when the decorated function was called.
+        * ``kwargs`` - The dictionary of keyword arguments supplied when the decorated function was called.
+        
+        The wrapper function would do whatever it needs to, but would usually in
+        turn call the wrapped function that is passed in via the ``wrapped``
+        argument.
+        
+        The decorator ``@wrapt.decorator`` then needs to be applied to the wrapper
+        function to convert it into a decorator which can in turn be applied to
+        other functions.
+        
+        ::
+        
+            import wrapt
+            
+            @wrapt.decorator
+            def pass_through(wrapped, instance, args, kwargs):
+                return wrapped(*args, **kwargs)
+        
+            @pass_through
+            def function():
+                pass
+        
+        If you wish to implement a decorator which accepts arguments, then wrap the
+        definition of the decorator in a function closure. Any arguments supplied
+        to the outer function when the decorator is applied, will be available to
+        the inner wrapper when the wrapped function is called.
+        
+        ::
+        
+            import wrapt
+        
+            def with_arguments(myarg1, myarg2):
+                @wrapt.decorator
+                def wrapper(wrapped, instance, args, kwargs):
+                    return wrapped(*args, **kwargs)
+                return wrapper
+        
+            @with_arguments(1, 2)
+            def function():
+                pass
+        
+        When applied to a normal function or static method, the wrapper function
+        when called will be passed ``None`` as the ``instance`` argument.
+        
+        When applied to an instance method, the wrapper function when called will
+        be passed the instance of the class the method is being called on as the
+        ``instance`` argument. This will be the case even when the instance method
+        was called explicitly via the class and the instance passed as the first
+        argument. That is, the instance will never be passed as part of ``args``.
+        
+        When applied to a class method, the wrapper function when called will be
+        passed the class type as the ``instance`` argument.
+        
+        When applied to a class, the wrapper function when called will be passed
+        ``None`` as the ``instance`` argument. The ``wrapped`` argument in this
+        case will be the class.
+        
+        The above rules can be summarised with the following example.
+        
+        ::
+        
+            import inspect
+            
+            @wrapt.decorator
+            def universal(wrapped, instance, args, kwargs):
+                if instance is None:
+                    if inspect.isclass(wrapped):
+                        # Decorator was applied to a class.
+                        return wrapped(*args, **kwargs)
+                    else:
+                        # Decorator was applied to a function or staticmethod.
+                        return wrapped(*args, **kwargs)
+                else:
+                    if inspect.isclass(instance):
+                        # Decorator was applied to a classmethod.
+                        return wrapped(*args, **kwargs)
+                    else:
+                        # Decorator was applied to an instancemethod.
+                        return wrapped(*args, **kwargs)
+        
+        Using these checks it is therefore possible to create a universal decorator
+        that can be applied in all situations. It is no longer necessary to create
+        different variants of decorators for normal functions and instance methods,
+        or use additional wrappers to convert a function decorator into one that
+        will work for instance methods.
+        
+        In all cases, the wrapped function passed to the wrapper function is called
+        in the same way, with ``args`` and ``kwargs`` being passed. The
+        ``instance`` argument doesn't need to be used in calling the wrapped
+        function.
+        
+        Repository
+        ----------
+        
+        Full source code for the **wrapt** module, including documentation files
+        and unit tests, can be obtained from github.
+        
+        * https://github.com/GrahamDumpleton/wrapt
+        
+        .. |Travis| image:: https://travis-ci.org/GrahamDumpleton/wrapt.svg?branch=develop
+           :target: https://travis-ci.org/GrahamDumpleton/wrapt
+        .. |Appveyor| image:: https://ci.appveyor.com/api/projects/status/32r7s2skrgm9ubva?svg=true
+           :target: https://ci.appveyor.com/project/GrahamDumpleton/wrapt/branch/develop
+        .. |Coveralls| image:: https://img.shields.io/coveralls/GrahamDumpleton/wrapt/develop.svg
+           :target: https://coveralls.io/github/GrahamDumpleton/wrapt?branch=develop
+        .. |PyPI| image:: https://img.shields.io/pypi/v/wrapt.svg
+           :target: https://pypi.python.org/pypi/wrapt
+        
+Platform: UNKNOWN
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: License :: OSI Approved :: BSD License
+Classifier: Programming Language :: Python :: 2
+Classifier: Programming Language :: Python :: 2.7
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.4
+Classifier: Programming Language :: Python :: 3.5
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
diff --git a/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/SOURCES.txt b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/SOURCES.txt
new file mode 100644
index 0000000..29b22c5
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/SOURCES.txt
@@ -0,0 +1,11 @@
+README.rst
+setup.py
+src/wrapt/__init__.py
+src/wrapt/_wrappers.c
+src/wrapt/decorators.py
+src/wrapt/importer.py
+src/wrapt/wrappers.py
+src/wrapt.egg-info/PKG-INFO
+src/wrapt.egg-info/SOURCES.txt
+src/wrapt.egg-info/dependency_links.txt
+src/wrapt.egg-info/top_level.txt
\ No newline at end of file
diff --git a/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/dependency_links.txt b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/dependency_links.txt
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/dependency_links.txt
@@ -0,0 +1 @@
+
diff --git a/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/installed-files.txt b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/installed-files.txt
new file mode 100644
index 0000000..20386bf
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/installed-files.txt
@@ -0,0 +1,13 @@
+../wrapt/__init__.py
+../wrapt/__pycache__/__init__.cpython-37.pyc
+../wrapt/__pycache__/decorators.cpython-37.pyc
+../wrapt/__pycache__/importer.cpython-37.pyc
+../wrapt/__pycache__/wrappers.cpython-37.pyc
+../wrapt/_wrappers.cpython-37m-darwin.so
+../wrapt/decorators.py
+../wrapt/importer.py
+../wrapt/wrappers.py
+PKG-INFO
+SOURCES.txt
+dependency_links.txt
+top_level.txt
diff --git a/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/top_level.txt b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/top_level.txt
new file mode 100644
index 0000000..ba11553
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt-1.11.1-py3.7.egg-info/top_level.txt
@@ -0,0 +1 @@
+wrapt
diff --git a/venv/lib/python3.7/site-packages/wrapt/__init__.py b/venv/lib/python3.7/site-packages/wrapt/__init__.py
new file mode 100644
index 0000000..ce87412
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt/__init__.py
@@ -0,0 +1,16 @@
+__version_info__ = ('1', '11', '1')
+__version__ = '.'.join(__version_info__)
+
+from .wrappers import (ObjectProxy, CallableObjectProxy, FunctionWrapper,
+        BoundFunctionWrapper, WeakFunctionProxy, PartialCallableObjectProxy,
+        resolve_path, apply_patch, wrap_object, wrap_object_attribute,
+        function_wrapper, wrap_function_wrapper, patch_function_wrapper,
+        transient_function_wrapper)
+
+from .decorators import (adapter_factory, AdapterFactory, decorator,
+        synchronized)
+
+from .importer import (register_post_import_hook, when_imported,
+        notify_module_loaded, discover_post_import_hooks)
+
+from inspect import getcallargs
diff --git a/venv/lib/python3.7/site-packages/wrapt/__pycache__/__init__.cpython-37.pyc b/venv/lib/python3.7/site-packages/wrapt/__pycache__/__init__.cpython-37.pyc
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diff --git a/venv/lib/python3.7/site-packages/wrapt/decorators.py b/venv/lib/python3.7/site-packages/wrapt/decorators.py
new file mode 100644
index 0000000..9b569f8
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt/decorators.py
@@ -0,0 +1,511 @@
+"""This module implements decorators for implementing other decorators
+as well as some commonly used decorators.
+
+"""
+
+import sys
+
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+if PY3:
+    string_types = str,
+
+    import builtins
+    exec_ = getattr(builtins, "exec")
+    del builtins
+
+else:
+    string_types = basestring,
+
+    def exec_(_code_, _globs_=None, _locs_=None):
+        """Execute code in a namespace."""
+        if _globs_ is None:
+            frame = sys._getframe(1)
+            _globs_ = frame.f_globals
+            if _locs_ is None:
+                _locs_ = frame.f_locals
+            del frame
+        elif _locs_ is None:
+            _locs_ = _globs_
+        exec("""exec _code_ in _globs_, _locs_""")
+
+from functools import partial
+from inspect import ismethod, isclass, formatargspec
+from collections import namedtuple
+from threading import Lock, RLock
+
+try:
+    from inspect import signature
+except ImportError:
+    pass
+
+from .wrappers import (FunctionWrapper, BoundFunctionWrapper, ObjectProxy,
+    CallableObjectProxy)
+
+# Adapter wrapper for the wrapped function which will overlay certain
+# properties from the adapter function onto the wrapped function so that
+# functions such as inspect.getargspec(), inspect.getfullargspec(),
+# inspect.signature() and inspect.getsource() return the correct results
+# one would expect.
+
+class _AdapterFunctionCode(CallableObjectProxy):
+
+    def __init__(self, wrapped_code, adapter_code):
+        super(_AdapterFunctionCode, self).__init__(wrapped_code)
+        self._self_adapter_code = adapter_code
+
+    @property
+    def co_argcount(self):
+        return self._self_adapter_code.co_argcount
+
+    @property
+    def co_code(self):
+        return self._self_adapter_code.co_code
+
+    @property
+    def co_flags(self):
+        return self._self_adapter_code.co_flags
+
+    @property
+    def co_kwonlyargcount(self):
+        return self._self_adapter_code.co_kwonlyargcount
+
+    @property
+    def co_varnames(self):
+        return self._self_adapter_code.co_varnames
+
+class _AdapterFunctionSurrogate(CallableObjectProxy):
+
+    def __init__(self, wrapped, adapter):
+        super(_AdapterFunctionSurrogate, self).__init__(wrapped)
+        self._self_adapter = adapter
+
+    @property
+    def __code__(self):
+        return _AdapterFunctionCode(self.__wrapped__.__code__,
+                self._self_adapter.__code__)
+
+    @property
+    def __defaults__(self):
+        return self._self_adapter.__defaults__
+
+    @property
+    def __kwdefaults__(self):
+        return self._self_adapter.__kwdefaults__
+
+    @property
+    def __signature__(self):
+        if 'signature' not in globals():
+            return self._self_adapter.__signature__
+        else:
+            # Can't allow this to fail on Python 3 else it falls
+            # through to using __wrapped__, but that will be the
+            # wrong function we want to derive the signature
+            # from. Thus generate the signature ourselves.
+
+            return signature(self._self_adapter)
+
+    if PY2:
+        func_code = __code__
+        func_defaults = __defaults__
+
+class _BoundAdapterWrapper(BoundFunctionWrapper):
+
+    @property
+    def __func__(self):
+        return _AdapterFunctionSurrogate(self.__wrapped__.__func__,
+                self._self_parent._self_adapter)
+
+    if PY2:
+        im_func = __func__
+
+class AdapterWrapper(FunctionWrapper):
+
+    __bound_function_wrapper__ = _BoundAdapterWrapper
+
+    def __init__(self, *args, **kwargs):
+        adapter = kwargs.pop('adapter')
+        super(AdapterWrapper, self).__init__(*args, **kwargs)
+        self._self_surrogate = _AdapterFunctionSurrogate(
+                self.__wrapped__, adapter)
+        self._self_adapter = adapter
+
+    @property
+    def __code__(self):
+        return self._self_surrogate.__code__
+
+    @property
+    def __defaults__(self):
+        return self._self_surrogate.__defaults__
+
+    @property
+    def __kwdefaults__(self):
+        return self._self_surrogate.__kwdefaults__
+
+    if PY2:
+        func_code = __code__
+        func_defaults = __defaults__
+
+    @property
+    def __signature__(self):
+        return self._self_surrogate.__signature__
+
+class AdapterFactory(object):
+    def __call__(self, wrapped):
+        raise NotImplementedError()
+
+class DelegatedAdapterFactory(AdapterFactory):
+    def __init__(self, factory):
+        super(DelegatedAdapterFactory, self).__init__()
+        self.factory = factory
+    def __call__(self, wrapped):
+        return self.factory(wrapped)
+
+adapter_factory = DelegatedAdapterFactory
+
+# Decorator for creating other decorators. This decorator and the
+# wrappers which they use are designed to properly preserve any name
+# attributes, function signatures etc, in addition to the wrappers
+# themselves acting like a transparent proxy for the original wrapped
+# function so the wrapper is effectively indistinguishable from the
+# original wrapped function.
+
+def decorator(wrapper=None, enabled=None, adapter=None):
+    # The decorator should be supplied with a single positional argument
+    # which is the wrapper function to be used to implement the
+    # decorator. This may be preceded by a step whereby the keyword
+    # arguments are supplied to customise the behaviour of the
+    # decorator. The 'adapter' argument is used to optionally denote a
+    # separate function which is notionally used by an adapter
+    # decorator. In that case parts of the function '__code__' and
+    # '__defaults__' attributes are used from the adapter function
+    # rather than those of the wrapped function. This allows for the
+    # argument specification from inspect.getargspec() and similar
+    # functions to be overridden with a prototype for a different
+    # function than what was wrapped. The 'enabled' argument provides a
+    # way to enable/disable the use of the decorator. If the type of
+    # 'enabled' is a boolean, then it is evaluated immediately and the
+    # wrapper not even applied if it is False. If not a boolean, it will
+    # be evaluated when the wrapper is called for an unbound wrapper,
+    # and when binding occurs for a bound wrapper. When being evaluated,
+    # if 'enabled' is callable it will be called to obtain the value to
+    # be checked. If False, the wrapper will not be called and instead
+    # the original wrapped function will be called directly instead.
+
+    if wrapper is not None:
+        # Helper function for creating wrapper of the appropriate
+        # time when we need it down below.
+
+        def _build(wrapped, wrapper, enabled=None, adapter=None):
+            if adapter:
+                if isinstance(adapter, AdapterFactory):
+                    adapter = adapter(wrapped)
+
+                if not callable(adapter):
+                    ns = {}
+                    if not isinstance(adapter, string_types):
+                        adapter = formatargspec(*adapter)
+                    exec_('def adapter{}: pass'.format(adapter), ns, ns)
+                    adapter = ns['adapter']
+
+                return AdapterWrapper(wrapped=wrapped, wrapper=wrapper,
+                        enabled=enabled, adapter=adapter)
+
+            return FunctionWrapper(wrapped=wrapped, wrapper=wrapper,
+                    enabled=enabled)
+
+        # The wrapper has been provided so return the final decorator.
+        # The decorator is itself one of our function wrappers so we
+        # can determine when it is applied to functions, instance methods
+        # or class methods. This allows us to bind the instance or class
+        # method so the appropriate self or cls attribute is supplied
+        # when it is finally called.
+
+        def _wrapper(wrapped, instance, args, kwargs):
+            # We first check for the case where the decorator was applied
+            # to a class type.
+            #
+            #     @decorator
+            #     class mydecoratorclass(object):
+            #         def __init__(self, arg=None):
+            #             self.arg = arg
+            #         def __call__(self, wrapped, instance, args, kwargs):
+            #             return wrapped(*args, **kwargs)
+            #
+            #     @mydecoratorclass(arg=1)
+            #     def function():
+            #         pass
+            #
+            # In this case an instance of the class is to be used as the
+            # decorator wrapper function. If args was empty at this point,
+            # then it means that there were optional keyword arguments
+            # supplied to be used when creating an instance of the class
+            # to be used as the wrapper function.
+
+            if instance is None and isclass(wrapped) and not args:
+                # We still need to be passed the target function to be
+                # wrapped as yet, so we need to return a further function
+                # to be able to capture it.
+
+                def _capture(target_wrapped):
+                    # Now have the target function to be wrapped and need
+                    # to create an instance of the class which is to act
+                    # as the decorator wrapper function. Before we do that,
+                    # we need to first check that use of the decorator
+                    # hadn't been disabled by a simple boolean. If it was,
+                    # the target function to be wrapped is returned instead.
+
+                    _enabled = enabled
+                    if type(_enabled) is bool:
+                        if not _enabled:
+                            return target_wrapped
+                        _enabled = None
+
+                    # Now create an instance of the class which is to act
+                    # as the decorator wrapper function. Any arguments had
+                    # to be supplied as keyword only arguments so that is
+                    # all we pass when creating it.
+
+                    target_wrapper = wrapped(**kwargs)
+
+                    # Finally build the wrapper itself and return it.
+
+                    return _build(target_wrapped, target_wrapper,
+                            _enabled, adapter)
+
+                return _capture
+
+            # We should always have the target function to be wrapped at
+            # this point as the first (and only) value in args.
+
+            target_wrapped = args[0]
+
+            # Need to now check that use of the decorator hadn't been
+            # disabled by a simple boolean. If it was, then target
+            # function to be wrapped is returned instead.
+
+            _enabled = enabled
+            if type(_enabled) is bool:
+                if not _enabled:
+                    return target_wrapped
+                _enabled = None
+
+            # We now need to build the wrapper, but there are a couple of
+            # different cases we need to consider.
+
+            if instance is None:
+                if isclass(wrapped):
+                    # In this case the decorator was applied to a class
+                    # type but optional keyword arguments were not supplied
+                    # for initialising an instance of the class to be used
+                    # as the decorator wrapper function.
+                    #
+                    #     @decorator
+                    #     class mydecoratorclass(object):
+                    #         def __init__(self, arg=None):
+                    #             self.arg = arg
+                    #         def __call__(self, wrapped, instance,
+                    #                 args, kwargs):
+                    #             return wrapped(*args, **kwargs)
+                    #
+                    #     @mydecoratorclass
+                    #     def function():
+                    #         pass
+                    #
+                    # We still need to create an instance of the class to
+                    # be used as the decorator wrapper function, but no
+                    # arguments are pass.
+
+                    target_wrapper = wrapped()
+
+                else:
+                    # In this case the decorator was applied to a normal
+                    # function, or possibly a static method of a class.
+                    #
+                    #     @decorator
+                    #     def mydecoratorfuntion(wrapped, instance,
+                    #             args, kwargs):
+                    #         return wrapped(*args, **kwargs)
+                    #
+                    #     @mydecoratorfunction
+                    #     def function():
+                    #         pass
+                    #
+                    # That normal function becomes the decorator wrapper
+                    # function.
+
+                    target_wrapper = wrapper
+
+            else:
+                if isclass(instance):
+                    # In this case the decorator was applied to a class
+                    # method.
+                    #
+                    #     class myclass(object):
+                    #         @decorator
+                    #         @classmethod
+                    #         def decoratorclassmethod(cls, wrapped,
+                    #                 instance, args, kwargs):
+                    #             return wrapped(*args, **kwargs)
+                    #
+                    #     instance = myclass()
+                    #
+                    #     @instance.decoratorclassmethod
+                    #     def function():
+                    #         pass
+                    #
+                    # This one is a bit strange because binding was actually
+                    # performed on the wrapper created by our decorator
+                    # factory. We need to apply that binding to the decorator
+                    # wrapper function which which the decorator factory
+                    # was applied to.
+
+                    target_wrapper = wrapper.__get__(None, instance)
+
+                else:
+                    # In this case the decorator was applied to an instance
+                    # method.
+                    #
+                    #     class myclass(object):
+                    #         @decorator
+                    #         def decoratorclassmethod(self, wrapped,
+                    #                 instance, args, kwargs):
+                    #             return wrapped(*args, **kwargs)
+                    #
+                    #     instance = myclass()
+                    #
+                    #     @instance.decoratorclassmethod
+                    #     def function():
+                    #         pass
+                    #
+                    # This one is a bit strange because binding was actually
+                    # performed on the wrapper created by our decorator
+                    # factory. We need to apply that binding to the decorator
+                    # wrapper function which which the decorator factory
+                    # was applied to.
+
+                    target_wrapper = wrapper.__get__(instance, type(instance))
+
+            # Finally build the wrapper itself and return it.
+
+            return _build(target_wrapped, target_wrapper, _enabled, adapter)
+
+        # We first return our magic function wrapper here so we can
+        # determine in what context the decorator factory was used. In
+        # other words, it is itself a universal decorator.
+
+        return _build(wrapper, _wrapper)
+
+    else:
+        # The wrapper still has not been provided, so we are just
+        # collecting the optional keyword arguments. Return the
+        # decorator again wrapped in a partial using the collected
+        # arguments.
+
+        return partial(decorator, enabled=enabled, adapter=adapter)
+
+# Decorator for implementing thread synchronization. It can be used as a
+# decorator, in which case the synchronization context is determined by
+# what type of function is wrapped, or it can also be used as a context
+# manager, where the user needs to supply the correct synchronization
+# context. It is also possible to supply an object which appears to be a
+# synchronization primitive of some sort, by virtue of having release()
+# and acquire() methods. In that case that will be used directly as the
+# synchronization primitive without creating a separate lock against the
+# derived or supplied context.
+
+def synchronized(wrapped):
+    # Determine if being passed an object which is a synchronization
+    # primitive. We can't check by type for Lock, RLock, Semaphore etc,
+    # as the means of creating them isn't the type. Therefore use the
+    # existence of acquire() and release() methods. This is more
+    # extensible anyway as it allows custom synchronization mechanisms.
+
+    if hasattr(wrapped, 'acquire') and hasattr(wrapped, 'release'):
+        # We remember what the original lock is and then return a new
+        # decorator which accesses and locks it. When returning the new
+        # decorator we wrap it with an object proxy so we can override
+        # the context manager methods in case it is being used to wrap
+        # synchronized statements with a 'with' statement.
+
+        lock = wrapped
+
+        @decorator
+        def _synchronized(wrapped, instance, args, kwargs):
+            # Execute the wrapped function while the original supplied
+            # lock is held.
+
+            with lock:
+                return wrapped(*args, **kwargs)
+
+        class _PartialDecorator(CallableObjectProxy):
+
+            def __enter__(self):
+                lock.acquire()
+                return lock
+
+            def __exit__(self, *args):
+                lock.release()
+
+        return _PartialDecorator(wrapped=_synchronized)
+
+    # Following only apply when the lock is being created automatically
+    # based on the context of what was supplied. In this case we supply
+    # a final decorator, but need to use FunctionWrapper directly as we
+    # want to derive from it to add context manager methods in case it is
+    # being used to wrap synchronized statements with a 'with' statement.
+
+    def _synchronized_lock(context):
+        # Attempt to retrieve the lock for the specific context.
+
+        lock = vars(context).get('_synchronized_lock', None)
+
+        if lock is None:
+            # There is no existing lock defined for the context we
+            # are dealing with so we need to create one. This needs
+            # to be done in a way to guarantee there is only one
+            # created, even if multiple threads try and create it at
+            # the same time. We can't always use the setdefault()
+            # method on the __dict__ for the context. This is the
+            # case where the context is a class, as __dict__ is
+            # actually a dictproxy. What we therefore do is use a
+            # meta lock on this wrapper itself, to control the
+            # creation and assignment of the lock attribute against
+            # the context.
+
+            with synchronized._synchronized_meta_lock:
+                # We need to check again for whether the lock we want
+                # exists in case two threads were trying to create it
+                # at the same time and were competing to create the
+                # meta lock.
+
+                lock = vars(context).get('_synchronized_lock', None)
+
+                if lock is None:
+                    lock = RLock()
+                    setattr(context, '_synchronized_lock', lock)
+
+        return lock
+
+    def _synchronized_wrapper(wrapped, instance, args, kwargs):
+        # Execute the wrapped function while the lock for the
+        # desired context is held. If instance is None then the
+        # wrapped function is used as the context.
+
+        with _synchronized_lock(instance or wrapped):
+            return wrapped(*args, **kwargs)
+
+    class _FinalDecorator(FunctionWrapper):
+
+        def __enter__(self):
+            self._self_lock = _synchronized_lock(self.__wrapped__)
+            self._self_lock.acquire()
+            return self._self_lock
+
+        def __exit__(self, *args):
+            self._self_lock.release()
+
+    return _FinalDecorator(wrapped=wrapped, wrapper=_synchronized_wrapper)
+
+synchronized._synchronized_meta_lock = Lock()
diff --git a/venv/lib/python3.7/site-packages/wrapt/importer.py b/venv/lib/python3.7/site-packages/wrapt/importer.py
new file mode 100644
index 0000000..9e617cd
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt/importer.py
@@ -0,0 +1,230 @@
+"""This module implements a post import hook mechanism styled after what is
+described in PEP-369. Note that it doesn't cope with modules being reloaded.
+
+"""
+
+import sys
+import threading
+
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+if PY3:
+    import importlib
+    string_types = str,
+else:
+    string_types = basestring,
+
+from .decorators import synchronized
+
+# The dictionary registering any post import hooks to be triggered once
+# the target module has been imported. Once a module has been imported
+# and the hooks fired, the list of hooks recorded against the target
+# module will be truncacted but the list left in the dictionary. This
+# acts as a flag to indicate that the module had already been imported.
+
+_post_import_hooks = {}
+_post_import_hooks_init = False
+_post_import_hooks_lock = threading.RLock()
+
+# Register a new post import hook for the target module name. This
+# differs from the PEP-369 implementation in that it also allows the
+# hook function to be specified as a string consisting of the name of
+# the callback in the form 'module:function'. This will result in a
+# proxy callback being registered which will defer loading of the
+# specified module containing the callback function until required.
+
+def _create_import_hook_from_string(name):
+    def import_hook(module):
+        module_name, function = name.split(':')
+        attrs = function.split('.')
+        __import__(module_name)
+        callback = sys.modules[module_name]
+        for attr in attrs:
+            callback = getattr(callback, attr)
+        return callback(module)
+    return import_hook
+
+@synchronized(_post_import_hooks_lock)
+def register_post_import_hook(hook, name):
+    # Create a deferred import hook if hook is a string name rather than
+    # a callable function.
+
+    if isinstance(hook, string_types):
+        hook = _create_import_hook_from_string(hook)
+
+    # Automatically install the import hook finder if it has not already
+    # been installed.
+
+    global _post_import_hooks_init
+
+    if not _post_import_hooks_init:
+        _post_import_hooks_init = True
+        sys.meta_path.insert(0, ImportHookFinder())
+
+    # Determine if any prior registration of a post import hook for
+    # the target modules has occurred and act appropriately.
+
+    hooks = _post_import_hooks.get(name, None)
+
+    if hooks is None:
+        # No prior registration of post import hooks for the target
+        # module. We need to check whether the module has already been
+        # imported. If it has we fire the hook immediately and add an
+        # empty list to the registry to indicate that the module has
+        # already been imported and hooks have fired. Otherwise add
+        # the post import hook to the registry.
+
+        module = sys.modules.get(name, None)
+
+        if module is not None:
+            _post_import_hooks[name] = []
+            hook(module)
+
+        else:
+            _post_import_hooks[name] = [hook]
+
+    elif hooks == []:
+        # A prior registration of port import hooks for the target
+        # module was done and the hooks already fired. Fire the hook
+        # immediately.
+
+        module = sys.modules[name]
+        hook(module)
+
+    else:
+        # A prior registration of port import hooks for the target
+        # module was done but the module has not yet been imported.
+
+        _post_import_hooks[name].append(hook)
+
+# Register post import hooks defined as package entry points.
+
+def _create_import_hook_from_entrypoint(entrypoint):
+    def import_hook(module):
+        __import__(entrypoint.module_name)
+        callback = sys.modules[entrypoint.module_name]
+        for attr in entrypoint.attrs:
+            callback = getattr(callback, attr)
+        return callback(module)
+    return import_hook
+
+def discover_post_import_hooks(group):
+    try:
+        import pkg_resources
+    except ImportError:
+        return
+
+    for entrypoint in pkg_resources.iter_entry_points(group=group):
+        callback = _create_import_hook_from_entrypoint(entrypoint)
+        register_post_import_hook(callback, entrypoint.name)
+
+# Indicate that a module has been loaded. Any post import hooks which
+# were registered against the target module will be invoked. If an
+# exception is raised in any of the post import hooks, that will cause
+# the import of the target module to fail.
+
+@synchronized(_post_import_hooks_lock)
+def notify_module_loaded(module):
+    name = getattr(module, '__name__', None)
+    hooks = _post_import_hooks.get(name, None)
+
+    if hooks:
+        _post_import_hooks[name] = []
+
+        for hook in hooks:
+            hook(module)
+
+# A custom module import finder. This intercepts attempts to import
+# modules and watches out for attempts to import target modules of
+# interest. When a module of interest is imported, then any post import
+# hooks which are registered will be invoked.
+
+class _ImportHookLoader:
+
+    def load_module(self, fullname):
+        module = sys.modules[fullname]
+        notify_module_loaded(module)
+
+        return module
+
+class _ImportHookChainedLoader:
+
+    def __init__(self, loader):
+        self.loader = loader
+
+    def load_module(self, fullname):
+        module = self.loader.load_module(fullname)
+        notify_module_loaded(module)
+
+        return module
+
+class ImportHookFinder:
+
+    def __init__(self):
+        self.in_progress = {}
+
+    @synchronized(_post_import_hooks_lock)
+    def find_module(self, fullname, path=None):
+        # If the module being imported is not one we have registered
+        # post import hooks for, we can return immediately. We will
+        # take no further part in the importing of this module.
+
+        if not fullname in _post_import_hooks:
+            return None
+
+        # When we are interested in a specific module, we will call back
+        # into the import system a second time to defer to the import
+        # finder that is supposed to handle the importing of the module.
+        # We set an in progress flag for the target module so that on
+        # the second time through we don't trigger another call back
+        # into the import system and cause a infinite loop.
+
+        if fullname in self.in_progress:
+            return None
+
+        self.in_progress[fullname] = True
+
+        # Now call back into the import system again.
+
+        try:
+            if PY3:
+                # For Python 3 we need to use find_spec().loader
+                # from the importlib.util module. It doesn't actually
+                # import the target module and only finds the
+                # loader. If a loader is found, we need to return
+                # our own loader which will then in turn call the
+                # real loader to import the module and invoke the
+                # post import hooks.
+                try:
+                    import importlib.util
+                    loader = importlib.util.find_spec(fullname).loader
+                except (ImportError, AttributeError):
+                    loader = importlib.find_loader(fullname, path)
+                if loader:
+                    return _ImportHookChainedLoader(loader)
+
+            else:
+                # For Python 2 we don't have much choice but to
+                # call back in to __import__(). This will
+                # actually cause the module to be imported. If no
+                # module could be found then ImportError will be
+                # raised. Otherwise we return a loader which
+                # returns the already loaded module and invokes
+                # the post import hooks.
+
+                __import__(fullname)
+
+                return _ImportHookLoader()
+
+        finally:
+            del self.in_progress[fullname]
+
+# Decorator for marking that a function should be called as a post
+# import hook when the target module is imported.
+
+def when_imported(name):
+    def register(hook):
+        register_post_import_hook(hook, name)
+        return hook
+    return register
diff --git a/venv/lib/python3.7/site-packages/wrapt/wrappers.py b/venv/lib/python3.7/site-packages/wrapt/wrappers.py
new file mode 100644
index 0000000..1d6131d
--- /dev/null
+++ b/venv/lib/python3.7/site-packages/wrapt/wrappers.py
@@ -0,0 +1,943 @@
+import os
+import sys
+import functools
+import operator
+import weakref
+import inspect
+
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+if PY3:
+    string_types = str,
+else:
+    string_types = basestring,
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass."""
+    return meta("NewBase", bases, {})
+
+class _ObjectProxyMethods(object):
+
+    # We use properties to override the values of __module__ and
+    # __doc__. If we add these in ObjectProxy, the derived class
+    # __dict__ will still be setup to have string variants of these
+    # attributes and the rules of descriptors means that they appear to
+    # take precedence over the properties in the base class. To avoid
+    # that, we copy the properties into the derived class type itself
+    # via a meta class. In that way the properties will always take
+    # precedence.
+
+    @property
+    def __module__(self):
+        return self.__wrapped__.__module__
+
+    @__module__.setter
+    def __module__(self, value):
+        self.__wrapped__.__module__ = value
+
+    @property
+    def __doc__(self):
+        return self.__wrapped__.__doc__
+
+    @__doc__.setter
+    def __doc__(self, value):
+        self.__wrapped__.__doc__ = value
+
+    # We similar use a property for __dict__. We need __dict__ to be
+    # explicit to ensure that vars() works as expected.
+
+    @property
+    def __dict__(self):
+        return self.__wrapped__.__dict__
+
+    # Need to also propagate the special __weakref__ attribute for case
+    # where decorating classes which will define this. If do not define
+    # it and use a function like inspect.getmembers() on a decorator
+    # class it will fail. This can't be in the derived classes.
+
+    @property
+    def __weakref__(self):
+        return self.__wrapped__.__weakref__
+
+class _ObjectProxyMetaType(type):
+    def __new__(cls, name, bases, dictionary):
+        # Copy our special properties into the class so that they
+        # always take precedence over attributes of the same name added
+        # during construction of a derived class. This is to save
+        # duplicating the implementation for them in all derived classes.
+
+        dictionary.update(vars(_ObjectProxyMethods))
+
+        return type.__new__(cls, name, bases, dictionary)
+
+class ObjectProxy(with_metaclass(_ObjectProxyMetaType)):
+
+    __slots__ = '__wrapped__'
+
+    def __init__(self, wrapped):
+        object.__setattr__(self, '__wrapped__', wrapped)
+
+        # Python 3.2+ has the __qualname__ attribute, but it does not
+        # allow it to be overridden using a property and it must instead
+        # be an actual string object instead.
+
+        try:
+            object.__setattr__(self, '__qualname__', wrapped.__qualname__)
+        except AttributeError:
+            pass
+
+    @property
+    def __name__(self):
+        return self.__wrapped__.__name__
+
+    @__name__.setter
+    def __name__(self, value):
+        self.__wrapped__.__name__ = value
+
+    @property
+    def __class__(self):
+        return self.__wrapped__.__class__
+
+    @__class__.setter
+    def __class__(self, value):
+        self.__wrapped__.__class__ = value
+
+    @property
+    def __annotations__(self):
+        return self.__wrapped__.__annotations__
+
+    @__annotations__.setter
+    def __annotations__(self, value):
+        self.__wrapped__.__annotations__ = value
+
+    def __dir__(self):
+        return dir(self.__wrapped__)
+
+    def __str__(self):
+        return str(self.__wrapped__)
+
+    if PY3:
+        def __bytes__(self):
+            return bytes(self.__wrapped__)
+
+    def __repr__(self):
+        return '<{} at 0x{:x} for {} at 0x{:x}>'.format(
+                type(self).__name__, id(self),
+                type(self.__wrapped__).__name__,
+                id(self.__wrapped__))
+
+    def __reversed__(self):
+        return reversed(self.__wrapped__)
+
+    if PY3:
+        def __round__(self):
+            return round(self.__wrapped__)
+
+    def __lt__(self, other):
+        return self.__wrapped__ < other
+
+    def __le__(self, other):
+        return self.__wrapped__ <= other
+
+    def __eq__(self, other):
+        return self.__wrapped__ == other
+
+    def __ne__(self, other):
+        return self.__wrapped__ != other
+
+    def __gt__(self, other):
+        return self.__wrapped__ > other
+
+    def __ge__(self, other):
+        return self.__wrapped__ >= other
+
+    def __hash__(self):
+        return hash(self.__wrapped__)
+
+    def __nonzero__(self):
+        return bool(self.__wrapped__)
+
+    def __bool__(self):
+        return bool(self.__wrapped__)
+
+    def __setattr__(self, name, value):
+        if name.startswith('_self_'):
+            object.__setattr__(self, name, value)
+
+        elif name == '__wrapped__':
+            object.__setattr__(self, name, value)
+            try:
+                object.__delattr__(self, '__qualname__')
+            except AttributeError:
+                pass
+            try:
+                object.__setattr__(self, '__qualname__', value.__qualname__)
+            except AttributeError:
+                pass
+
+        elif name == '__qualname__':
+            setattr(self.__wrapped__, name, value)
+            object.__setattr__(self, name, value)
+
+        elif hasattr(type(self), name):
+            object.__setattr__(self, name, value)
+
+        else:
+            setattr(self.__wrapped__, name, value)
+
+    def __getattr__(self, name):
+        # If we are being to lookup '__wrapped__' then the
+        # '__init__()' method cannot have been called.
+
+        if name == '__wrapped__':
+            raise ValueError('wrapper has not been initialised')
+
+        return getattr(self.__wrapped__, name)
+
+    def __delattr__(self, name):
+        if name.startswith('_self_'):
+            object.__delattr__(self, name)
+
+        elif name == '__wrapped__':
+            raise TypeError('__wrapped__ must be an object')
+
+        elif name == '__qualname__':
+            object.__delattr__(self, name)
+            delattr(self.__wrapped__, name)
+
+        elif hasattr(type(self), name):
+            object.__delattr__(self, name)
+
+        else:
+            delattr(self.__wrapped__, name)
+
+    def __add__(self, other):
+        return self.__wrapped__ + other
+
+    def __sub__(self, other):
+        return self.__wrapped__ - other
+
+    def __mul__(self, other):
+        return self.__wrapped__ * other
+
+    def __div__(self, other):
+        return operator.div(self.__wrapped__, other)
+
+    def __truediv__(self, other):
+        return operator.truediv(self.__wrapped__, other)
+
+    def __floordiv__(self, other):
+        return self.__wrapped__ // other
+
+    def __mod__(self, other):
+        return self.__wrapped__ % other
+
+    def __divmod__(self, other):
+        return divmod(self.__wrapped__, other)
+
+    def __pow__(self, other, *args):
+        return pow(self.__wrapped__, other, *args)
+
+    def __lshift__(self, other):
+        return self.__wrapped__ << other
+
+    def __rshift__(self, other):
+        return self.__wrapped__ >> other
+
+    def __and__(self, other):
+        return self.__wrapped__ & other
+
+    def __xor__(self, other):
+        return self.__wrapped__ ^ other
+
+    def __or__(self, other):
+        return self.__wrapped__ | other
+
+    def __radd__(self, other):
+        return other + self.__wrapped__
+
+    def __rsub__(self, other):
+        return other - self.__wrapped__
+
+    def __rmul__(self, other):
+        return other * self.__wrapped__
+
+    def __rdiv__(self, other):
+        return operator.div(other, self.__wrapped__)
+
+    def __rtruediv__(self, other):
+        return operator.truediv(other, self.__wrapped__)
+
+    def __rfloordiv__(self, other):
+        return other // self.__wrapped__
+
+    def __rmod__(self, other):
+        return other % self.__wrapped__
+
+    def __rdivmod__(self, other):
+        return divmod(other, self.__wrapped__)
+
+    def __rpow__(self, other, *args):
+        return pow(other, self.__wrapped__, *args)
+
+    def __rlshift__(self, other):
+        return other << self.__wrapped__
+
+    def __rrshift__(self, other):
+        return other >> self.__wrapped__
+
+    def __rand__(self, other):
+        return other & self.__wrapped__
+
+    def __rxor__(self, other):
+        return other ^ self.__wrapped__
+
+    def __ror__(self, other):
+        return other | self.__wrapped__
+
+    def __iadd__(self, other):
+        self.__wrapped__ += other
+        return self
+
+    def __isub__(self, other):
+        self.__wrapped__ -= other
+        return self
+
+    def __imul__(self, other):
+        self.__wrapped__ *= other
+        return self
+
+    def __idiv__(self, other):
+        self.__wrapped__ = operator.idiv(self.__wrapped__, other)
+        return self
+
+    def __itruediv__(self, other):
+        self.__wrapped__ = operator.itruediv(self.__wrapped__, other)
+        return self
+
+    def __ifloordiv__(self, other):
+        self.__wrapped__ //= other
+        return self
+
+    def __imod__(self, other):
+        self.__wrapped__ %= other
+        return self
+
+    def __ipow__(self, other):
+        self.__wrapped__ **= other
+        return self
+
+    def __ilshift__(self, other):
+        self.__wrapped__ <<= other
+        return self
+
+    def __irshift__(self, other):
+        self.__wrapped__ >>= other
+        return self
+
+    def __iand__(self, other):
+        self.__wrapped__ &= other
+        return self
+
+    def __ixor__(self, other):
+        self.__wrapped__ ^= other
+        return self
+
+    def __ior__(self, other):
+        self.__wrapped__ |= other
+        return self
+
+    def __neg__(self):
+        return -self.__wrapped__
+
+    def __pos__(self):
+        return +self.__wrapped__
+
+    def __abs__(self):
+        return abs(self.__wrapped__)
+
+    def __invert__(self):
+        return ~self.__wrapped__
+
+    def __int__(self):
+        return int(self.__wrapped__)
+
+    def __long__(self):
+        return long(self.__wrapped__)
+
+    def __float__(self):
+        return float(self.__wrapped__)
+
+    def __complex__(self):
+        return complex(self.__wrapped__)
+
+    def __oct__(self):
+        return oct(self.__wrapped__)
+
+    def __hex__(self):
+        return hex(self.__wrapped__)
+
+    def __index__(self):
+        return operator.index(self.__wrapped__)
+
+    def __len__(self):
+        return len(self.__wrapped__)
+
+    def __contains__(self, value):
+        return value in self.__wrapped__
+
+    def __getitem__(self, key):
+        return self.__wrapped__[key]
+
+    def __setitem__(self, key, value):
+        self.__wrapped__[key] = value
+
+    def __delitem__(self, key):
+        del self.__wrapped__[key]
+
+    def __getslice__(self, i, j):
+        return self.__wrapped__[i:j]
+
+    def __setslice__(self, i, j, value):
+        self.__wrapped__[i:j] = value
+
+    def __delslice__(self, i, j):
+        del self.__wrapped__[i:j]
+
+    def __enter__(self):
+        return self.__wrapped__.__enter__()
+
+    def __exit__(self, *args, **kwargs):
+        return self.__wrapped__.__exit__(*args, **kwargs)
+
+    def __iter__(self):
+        return iter(self.__wrapped__)
+
+    def __copy__(self):
+        raise NotImplementedError('object proxy must define __copy__()')
+
+    def __deepcopy__(self, memo):
+        raise NotImplementedError('object proxy must define __deepcopy__()')
+
+    def __reduce__(self):
+        raise NotImplementedError(
+                'object proxy must define __reduce_ex__()')
+
+    def __reduce_ex__(self, protocol):
+        raise NotImplementedError(
+                'object proxy must define __reduce_ex__()')
+
+class CallableObjectProxy(ObjectProxy):
+
+    def __call__(self, *args, **kwargs):
+        return self.__wrapped__(*args, **kwargs)
+
+class PartialCallableObjectProxy(ObjectProxy):
+
+    def __init__(self, *args, **kwargs):
+        if len(args) < 1:
+            raise TypeError('partial type takes at least one argument')
+
+        wrapped, args = args[0], args[1:]
+
+        if not callable(wrapped):
+            raise TypeError('the first argument must be callable')
+
+        super(PartialCallableObjectProxy, self).__init__(wrapped)
+
+        self._self_args = args
+        self._self_kwargs = kwargs
+
+    def __call__(self, *args, **kwargs):
+        _args = self._self_args + args
+
+        _kwargs = dict(self._self_kwargs)
+        _kwargs.update(kwargs)
+
+        return self.__wrapped__(*_args, **_kwargs)
+
+class _FunctionWrapperBase(ObjectProxy):
+
+    __slots__ = ('_self_instance', '_self_wrapper', '_self_enabled',
+            '_self_binding', '_self_parent')
+
+    def __init__(self, wrapped, instance, wrapper, enabled=None,
+            binding='function', parent=None):
+
+        super(_FunctionWrapperBase, self).__init__(wrapped)
+
+        object.__setattr__(self, '_self_instance', instance)
+        object.__setattr__(self, '_self_wrapper', wrapper)
+        object.__setattr__(self, '_self_enabled', enabled)
+        object.__setattr__(self, '_self_binding', binding)
+        object.__setattr__(self, '_self_parent', parent)
+
+    def __get__(self, instance, owner):
+        # This method is actually doing double duty for both unbound and
+        # bound derived wrapper classes. It should possibly be broken up
+        # and the distinct functionality moved into the derived classes.
+        # Can't do that straight away due to some legacy code which is
+        # relying on it being here in this base class.
+        #
+        # The distinguishing attribute which determines whether we are
+        # being called in an unbound or bound wrapper is the parent
+        # attribute. If binding has never occurred, then the parent will
+        # be None.
+        #
+        # First therefore, is if we are called in an unbound wrapper. In
+        # this case we perform the binding.
+        #
+        # We have one special case to worry about here. This is where we
+        # are decorating a nested class. In this case the wrapped class
+        # would not have a __get__() method to call. In that case we
+        # simply return self.
+        #
+        # Note that we otherwise still do binding even if instance is
+        # None and accessing an unbound instance method from a class.
+        # This is because we need to be able to later detect that
+        # specific case as we will need to extract the instance from the
+        # first argument of those passed in.
+
+        if self._self_parent is None:
+            if not inspect.isclass(self.__wrapped__):
+                descriptor = self.__wrapped__.__get__(instance, owner)
+
+                return self.__bound_function_wrapper__(descriptor, instance,
+                        self._self_wrapper, self._self_enabled,
+                        self._self_binding, self)
+
+            return self
+
+        # Now we have the case of binding occurring a second time on what
+        # was already a bound function. In this case we would usually
+        # return ourselves again. This mirrors what Python does.
+        #
+        # The special case this time is where we were originally bound
+        # with an instance of None and we were likely an instance
+        # method. In that case we rebind against the original wrapped
+        # function from the parent again.
+
+        if self._self_instance is None and self._self_binding == 'function':
+            descriptor = self._self_parent.__wrapped__.__get__(
+                    instance, owner)
+
+            return self._self_parent.__bound_function_wrapper__(
+                    descriptor, instance, self._self_wrapper,
+                    self._self_enabled, self._self_binding,
+                    self._self_parent)
+
+        return self
+
+    def __call__(self, *args, **kwargs):
+        # If enabled has been specified, then evaluate it at this point
+        # and if the wrapper is not to be executed, then simply return
+        # the bound function rather than a bound wrapper for the bound
+        # function. When evaluating enabled, if it is callable we call
+        # it, otherwise we evaluate it as a boolean.
+
+        if self._self_enabled is not None:
+            if callable(self._self_enabled):
+                if not self._self_enabled():
+                    return self.__wrapped__(*args, **kwargs)
+            elif not self._self_enabled:
+                return self.__wrapped__(*args, **kwargs)
+
+        # This can occur where initial function wrapper was applied to
+        # a function that was already bound to an instance. In that case
+        # we want to extract the instance from the function and use it.
+
+        if self._self_binding == 'function':
+            if self._self_instance is None:
+                instance = getattr(self.__wrapped__, '__self__', None)
+                if instance is not None:
+                    return self._self_wrapper(self.__wrapped__, instance,
+                            args, kwargs)
+
+        # This is generally invoked when the wrapped function is being
+        # called as a normal function and is not bound to a class as an
+        # instance method. This is also invoked in the case where the
+        # wrapped function was a method, but this wrapper was in turn
+        # wrapped using the staticmethod decorator.
+
+        return self._self_wrapper(self.__wrapped__, self._self_instance,
+                args, kwargs)
+
+class BoundFunctionWrapper(_FunctionWrapperBase):
+
+    def __call__(self, *args, **kwargs):
+        # If enabled has been specified, then evaluate it at this point
+        # and if the wrapper is not to be executed, then simply return
+        # the bound function rather than a bound wrapper for the bound
+        # function. When evaluating enabled, if it is callable we call
+        # it, otherwise we evaluate it as a boolean.
+
+        if self._self_enabled is not None:
+            if callable(self._self_enabled):
+                if not self._self_enabled():
+                    return self.__wrapped__(*args, **kwargs)
+            elif not self._self_enabled:
+                return self.__wrapped__(*args, **kwargs)
+
+        # We need to do things different depending on whether we are
+        # likely wrapping an instance method vs a static method or class
+        # method.
+
+        if self._self_binding == 'function':
+            if self._self_instance is None:
+                # This situation can occur where someone is calling the
+                # instancemethod via the class type and passing the instance
+                # as the first argument. We need to shift the args before
+                # making the call to the wrapper and effectively bind the
+                # instance to the wrapped function using a partial so the
+                # wrapper doesn't see anything as being different.
+
+                if not args:
+                    raise TypeError('missing 1 required positional argument')
+
+                instance, args = args[0], args[1:]
+                wrapped = PartialCallableObjectProxy(self.__wrapped__, instance)
+                return self._self_wrapper(wrapped, instance, args, kwargs)
+
+            return self._self_wrapper(self.__wrapped__, self._self_instance,
+                    args, kwargs)
+
+        else:
+            # As in this case we would be dealing with a classmethod or
+            # staticmethod, then _self_instance will only tell us whether
+            # when calling the classmethod or staticmethod they did it via an
+            # instance of the class it is bound to and not the case where
+            # done by the class type itself. We thus ignore _self_instance
+            # and use the __self__ attribute of the bound function instead.
+            # For a classmethod, this means instance will be the class type
+            # and for a staticmethod it will be None. This is probably the
+            # more useful thing we can pass through even though we loose
+            # knowledge of whether they were called on the instance vs the
+            # class type, as it reflects what they have available in the
+            # decoratored function.
+
+            instance = getattr(self.__wrapped__, '__self__', None)
+
+            return self._self_wrapper(self.__wrapped__, instance, args,
+                    kwargs)
+
+class FunctionWrapper(_FunctionWrapperBase):
+
+    __bound_function_wrapper__ = BoundFunctionWrapper
+
+    def __init__(self, wrapped, wrapper, enabled=None):
+        # What it is we are wrapping here could be anything. We need to
+        # try and detect specific cases though. In particular, we need
+        # to detect when we are given something that is a method of a
+        # class. Further, we need to know when it is likely an instance
+        # method, as opposed to a class or static method. This can
+        # become problematic though as there isn't strictly a fool proof
+        # method of knowing.
+        #
+        # The situations we could encounter when wrapping a method are:
+        #
+        # 1. The wrapper is being applied as part of a decorator which
+        # is a part of the class definition. In this case what we are
+        # given is the raw unbound function, classmethod or staticmethod
+        # wrapper objects.
+        #
+        # The problem here is that we will not know we are being applied
+        # in the context of the class being set up. This becomes
+        # important later for the case of an instance method, because in
+        # that case we just see it as a raw function and can't
+        # distinguish it from wrapping a normal function outside of
+        # a class context.
+        #
+        # 2. The wrapper is being applied when performing monkey
+        # patching of the class type afterwards and the method to be
+        # wrapped was retrieved direct from the __dict__ of the class
+        # type. This is effectively the same as (1) above.
+        #
+        # 3. The wrapper is being applied when performing monkey
+        # patching of the class type afterwards and the method to be
+        # wrapped was retrieved from the class type. In this case
+        # binding will have been performed where the instance against
+        # which the method is bound will be None at that point.
+        #
+        # This case is a problem because we can no longer tell if the
+        # method was a static method, plus if using Python3, we cannot
+        # tell if it was an instance method as the concept of an
+        # unnbound method no longer exists.
+        #
+        # 4. The wrapper is being applied when performing monkey
+        # patching of an instance of a class. In this case binding will
+        # have been perfomed where the instance was not None.
+        #
+        # This case is a problem because we can no longer tell if the
+        # method was a static method.
+        #
+        # Overall, the best we can do is look at the original type of the
+        # object which was wrapped prior to any binding being done and
+        # see if it is an instance of classmethod or staticmethod. In
+        # the case where other decorators are between us and them, if
+        # they do not propagate the __class__  attribute so that the
+        # isinstance() checks works, then likely this will do the wrong
+        # thing where classmethod and staticmethod are used.
+        #
+        # Since it is likely to be very rare that anyone even puts
+        # decorators around classmethod and staticmethod, likelihood of
+        # that being an issue is very small, so we accept it and suggest
+        # that those other decorators be fixed. It is also only an issue
+        # if a decorator wants to actually do things with the arguments.
+        #
+        # As to not being able to identify static methods properly, we
+        # just hope that that isn't something people are going to want
+        # to wrap, or if they do suggest they do it the correct way by
+        # ensuring that it is decorated in the class definition itself,
+        # or patch it in the __dict__ of the class type.
+        #
+        # So to get the best outcome we can, whenever we aren't sure what
+        # it is, we label it as a 'function'. If it was already bound and
+        # that is rebound later, we assume that it will be an instance
+        # method and try an cope with the possibility that the 'self'
+        # argument it being passed as an explicit argument and shuffle
+        # the arguments around to extract 'self' for use as the instance.
+
+        if isinstance(wrapped, classmethod):
+            binding = 'classmethod'
+
+        elif isinstance(wrapped, staticmethod):
+            binding = 'staticmethod'
+
+        elif hasattr(wrapped, '__self__'):
+            if inspect.isclass(wrapped.__self__):
+                binding = 'classmethod'
+            else:
+                binding = 'function'
+
+        else:
+            binding = 'function'
+
+        super(FunctionWrapper, self).__init__(wrapped, None, wrapper,
+                enabled, binding)
+
+try:
+    if not os.environ.get('WRAPT_DISABLE_EXTENSIONS'):
+        from ._wrappers import (ObjectProxy, CallableObjectProxy,
+            PartialCallableObjectProxy, FunctionWrapper,
+            BoundFunctionWrapper, _FunctionWrapperBase)
+except ImportError:
+    pass
+
+# Helper functions for applying wrappers to existing functions.
+
+def resolve_path(module, name):
+    if isinstance(module, string_types):
+        __import__(module)
+        module = sys.modules[module]
+
+    parent = module
+
+    path = name.split('.')
+    attribute = path[0]
+
+    original = getattr(parent, attribute)
+    for attribute in path[1:]:
+        parent = original
+
+        # We can't just always use getattr() because in doing
+        # that on a class it will cause binding to occur which
+        # will complicate things later and cause some things not
+        # to work. For the case of a class we therefore access
+        # the __dict__ directly. To cope though with the wrong
+        # class being given to us, or a method being moved into
+        # a base class, we need to walk the class hierarchy to
+        # work out exactly which __dict__ the method was defined
+        # in, as accessing it from __dict__ will fail if it was
+        # not actually on the class given. Fallback to using
+        # getattr() if we can't find it. If it truly doesn't
+        # exist, then that will fail.
+
+        if inspect.isclass(original):
+            for cls in inspect.getmro(original):
+                if attribute in vars(cls):
+                    original = vars(cls)[attribute]
+                    break
+            else:
+                original = getattr(original, attribute)
+
+        else:
+            original = getattr(original, attribute)
+
+    return (parent, attribute, original)
+
+def apply_patch(parent, attribute, replacement):
+    setattr(parent, attribute, replacement)
+
+def wrap_object(module, name, factory, args=(), kwargs={}):
+    (parent, attribute, original) = resolve_path(module, name)
+    wrapper = factory(original, *args, **kwargs)
+    apply_patch(parent, attribute, wrapper)
+    return wrapper
+
+# Function for applying a proxy object to an attribute of a class
+# instance. The wrapper works by defining an attribute of the same name
+# on the class which is a descriptor and which intercepts access to the
+# instance attribute. Note that this cannot be used on attributes which
+# are themselves defined by a property object.
+
+class AttributeWrapper(object):
+
+    def __init__(self, attribute, factory, args, kwargs):
+        self.attribute = attribute
+        self.factory = factory
+        self.args = args
+        self.kwargs = kwargs
+
+    def __get__(self, instance, owner):
+        value = instance.__dict__[self.attribute]
+        return self.factory(value, *self.args, **self.kwargs)
+
+    def __set__(self, instance, value):
+        instance.__dict__[self.attribute] = value
+
+    def __delete__(self, instance):
+        del instance.__dict__[self.attribute]
+
+def wrap_object_attribute(module, name, factory, args=(), kwargs={}):
+    path, attribute = name.rsplit('.', 1)
+    parent = resolve_path(module, path)[2]
+    wrapper = AttributeWrapper(attribute, factory, args, kwargs)
+    apply_patch(parent, attribute, wrapper)
+    return wrapper
+
+# Functions for creating a simple decorator using a FunctionWrapper,
+# plus short cut functions for applying wrappers to functions. These are
+# for use when doing monkey patching. For a more featured way of
+# creating decorators see the decorator decorator instead.
+
+def function_wrapper(wrapper):
+    def _wrapper(wrapped, instance, args, kwargs):
+        target_wrapped = args[0]
+        if instance is None:
+            target_wrapper = wrapper
+        elif inspect.isclass(instance):
+            target_wrapper = wrapper.__get__(None, instance)
+        else:
+            target_wrapper = wrapper.__get__(instance, type(instance))
+        return FunctionWrapper(target_wrapped, target_wrapper)
+    return FunctionWrapper(wrapper, _wrapper)
+
+def wrap_function_wrapper(module, name, wrapper):
+    return wrap_object(module, name, FunctionWrapper, (wrapper,))
+
+def patch_function_wrapper(module, name):
+    def _wrapper(wrapper):
+        return wrap_object(module, name, FunctionWrapper, (wrapper,))
+    return _wrapper
+
+def transient_function_wrapper(module, name):
+    def _decorator(wrapper):
+        def _wrapper(wrapped, instance, args, kwargs):
+            target_wrapped = args[0]
+            if instance is None:
+                target_wrapper = wrapper
+            elif inspect.isclass(instance):
+                target_wrapper = wrapper.__get__(None, instance)
+            else:
+                target_wrapper = wrapper.__get__(instance, type(instance))
+            def _execute(wrapped, instance, args, kwargs):
+                (parent, attribute, original) = resolve_path(module, name)
+                replacement = FunctionWrapper(original, target_wrapper)
+                setattr(parent, attribute, replacement)
+                try:
+                    return wrapped(*args, **kwargs)
+                finally:
+                    setattr(parent, attribute, original)
+            return FunctionWrapper(target_wrapped, _execute)
+        return FunctionWrapper(wrapper, _wrapper)
+    return _decorator
+
+# A weak function proxy. This will work on instance methods, class
+# methods, static methods and regular functions. Special treatment is
+# needed for the method types because the bound method is effectively a
+# transient object and applying a weak reference to one will immediately
+# result in it being destroyed and the weakref callback called. The weak
+# reference is therefore applied to the instance the method is bound to
+# and the original function. The function is then rebound at the point
+# of a call via the weak function proxy.
+
+def _weak_function_proxy_callback(ref, proxy, callback):
+    if proxy._self_expired:
+        return
+
+    proxy._self_expired = True
+
+    # This could raise an exception. We let it propagate back and let
+    # the weakref.proxy() deal with it, at which point it generally
+    # prints out a short error message direct to stderr and keeps going.
+
+    if callback is not None:
+        callback(proxy)
+
+class WeakFunctionProxy(ObjectProxy):
+
+    __slots__ = ('_self_expired', '_self_instance')
+
+    def __init__(self, wrapped, callback=None):
+        # We need to determine if the wrapped function is actually a
+        # bound method. In the case of a bound method, we need to keep a
+        # reference to the original unbound function and the instance.
+        # This is necessary because if we hold a reference to the bound
+        # function, it will be the only reference and given it is a
+        # temporary object, it will almost immediately expire and
+        # the weakref callback triggered. So what is done is that we
+        # hold a reference to the instance and unbound function and
+        # when called bind the function to the instance once again and
+        # then call it. Note that we avoid using a nested function for
+        # the callback here so as not to cause any odd reference cycles.
+
+        _callback = callback and functools.partial(
+                _weak_function_proxy_callback, proxy=self,
+                callback=callback)
+
+        self._self_expired = False
+
+        if isinstance(wrapped, _FunctionWrapperBase):
+            self._self_instance = weakref.ref(wrapped._self_instance,
+                    _callback)
+
+            if wrapped._self_parent is not None:
+                super(WeakFunctionProxy, self).__init__(
+                        weakref.proxy(wrapped._self_parent, _callback))
+
+            else:
+                super(WeakFunctionProxy, self).__init__(
+                        weakref.proxy(wrapped, _callback))
+
+            return
+
+        try:
+            self._self_instance = weakref.ref(wrapped.__self__, _callback)
+
+            super(WeakFunctionProxy, self).__init__(
+                    weakref.proxy(wrapped.__func__, _callback))
+
+        except AttributeError:
+            self._self_instance = None
+
+            super(WeakFunctionProxy, self).__init__(
+                    weakref.proxy(wrapped, _callback))
+
+    def __call__(self, *args, **kwargs):
+        # We perform a boolean check here on the instance and wrapped
+        # function as that will trigger the reference error prior to
+        # calling if the reference had expired.
+
+        instance = self._self_instance and self._self_instance()
+        function = self.__wrapped__ and self.__wrapped__
+
+        # If the wrapped function was originally a bound function, for
+        # which we retained a reference to the instance and the unbound
+        # function we need to rebind the function and then call it. If
+        # not just called the wrapped function.
+
+        if instance is None:
+            return self.__wrapped__(*args, **kwargs)
+
+        return function.__get__(instance, type(instance))(*args, **kwargs)
diff --git a/venv/pyvenv.cfg b/venv/pyvenv.cfg
new file mode 100644
index 0000000..9f5cf86
--- /dev/null
+++ b/venv/pyvenv.cfg
@@ -0,0 +1,3 @@
+home = /usr/local/bin
+include-system-site-packages = false
+version = 3.7.3