refactor: add game state abstraction

game_state.c

@@ -0,0 +1,72 @@
+#include "game_state.h"
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+char *word_bank[] = {
+  "hypothesis",
+  "science",
+  "usurp",
+  "conditional",
+  "passionate",
+  "orion",
+  NULL // sentinel value marking end
+};
+
+struct game_state {
+  char **curr_el;
+  unsigned short curr_letter_index;
+  unsigned short wins;
+};
+
+static struct game_state state;
+
+void init_game_state() {
+  state.curr_el = word_bank;
+  state.curr_letter_index = 0;
+  state.wins = 0;
+}
+
+// Gets the word at the current element. Will always return a valid non-null pointer to first char of the word
+char *get_curr_word() {
+  assert(state.curr_el != NULL);
+  assert((*state.curr_el) != NULL);
+  return *state.curr_el;
+}
+
+char get_curr_letter() {
+  char *word = get_curr_word();
+  return word[state.curr_letter_index];
+}
+
+int get_curr_letter_index() {
+  return state.curr_letter_index;
+}
+
+int get_wins() {
+  return state.wins;
+}
+
+// goes to the next word in the word bank, wrapping when necessary
+static void go_next_word() {
+  if (*(state.curr_el + 1) == NULL) {
+    state.curr_el = word_bank;
+  } else {
+    state.curr_el++;
+  }
+
+  state.wins++;
+  state.curr_letter_index = 0;
+}
+
+// handle either going to the next letter or next word if at the end 
+void next() {
+  size_t word_len = strlen(get_curr_word());
+  if (state.curr_letter_index >= word_len - 1) { // at last character
+    go_next_word();
+  } else {
+    state.curr_letter_index++;
+  }
+}

game_state.h

@@ -0,0 +1,17 @@
+#ifndef GAMESTATE_H
+#define GAMESTATE_H
+
+void init_game_state();
+
+// Gets the word at the current element. Will always return a valid non-null pointer to first char of the word
+char *get_curr_word();
+
+char get_curr_letter();
+int get_curr_letter_index();
+
+int get_wins();
+
+// handle either going to the next letter or next word if at the end 
+void next();
+
+#endif

main.c

@@ -1,90 +1,80 @@
 #include <raylib.h>
 #include <stdio.h>
 #include <string.h>
-
-char *word_bank[] = {
-  "hypothesis",
-  "science",
-  "usurp",
-  "conditional",
-  "passionate",
-  "orion",
-  NULL // sentinel value marking end
-};
+#include <assert.h>
+#include "game_state.h"
 
 #define WINDOW_HEIGHT 500
 #define WINDOW_WIDTH 700
 #define CHAR_SPACING 40
 
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+void process_key_events() {
+  char buf[2] = {'c', '\0'};
+  int k;
+  const char *key_name;
+  
+  while ((k = GetKeyPressed()) != 0) {
+    key_name = GetKeyName(k);
+    
+    char c = get_curr_letter();
+    sprintf(buf, "%c\0", c);
+
+    if (key_name != NULL &&
+         strcmp(key_name, buf) == 0) {
+      next();
+    }
+  }
+}
+
+void render_game_state() {
+  char buf[2] = {'c', '\0'};
+  char *curr_word = get_curr_word();
+  int curr_letter_index = get_curr_letter_index();
+  size_t word_len = strlen(curr_word);
+  
+  DrawText(curr_word, 10, 10, 20, BLACK);
+    
+  int x = (WINDOW_WIDTH / 2) - (CHAR_SPACING * (word_len / 2));
+  int y = WINDOW_HEIGHT / 2;
+
+  for (int i = 0; i < word_len; i++) {
+    char c = curr_word[i];
+      
+    sprintf(buf, "%c\0", c);
+      
+    Color color;
+    if (i == curr_letter_index) {
+      color = GOLD;
+    } else if (i < curr_letter_index) {
+      color = DARKGRAY;
+    } else {
+      color = GRAY;
+    }
+		 
+    DrawText(buf, x, y, 50, color);
+    x += CHAR_SPACING;
+  }
+
+  char wins_text[20];
+  snprintf(wins_text, 20, "%d wins", get_wins());
+  DrawText(wins_text, WINDOW_WIDTH - 100, WINDOW_HEIGHT - 20, 20, GRAY);
+}
 
 int main(int argc, char *argv[]) {
-  char **curr_word = word_bank;
-  unsigned short curr_letter_index = 0;
-  unsigned short wins = 0;
-
   InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Typing game");
   
+  init_game_state();
+  
   while (!WindowShouldClose()) {
-    char buf[2] = {'c', '\0'};
-    size_t word_len = strlen(*curr_word);
+    process_key_events();
     
-    int k = 0;
-    const char *key_name;
-    // process queued key events
-    while ((k = GetKeyPressed()) != 0) {
-      key_name = GetKeyName(k);
-
-      char c = (*curr_word)[curr_letter_index];
-      sprintf(buf, "%c\0", c);
-
-      if (key_name != NULL &&
-	  strcmp(key_name, buf) == 0) {
-	if (curr_letter_index < word_len - 1) { // next letter
-	  curr_letter_index++;
-	} else { // next word
-	  if (*(curr_word + 1) == NULL) { // wrap around
-	    curr_word = word_bank;
-	  } else {
-	    curr_word++;
-	    wins++;
-	  }
-	  curr_letter_index = 0;
-	}
-      }
-    }
-
-    // render
     BeginDrawing();
     ClearBackground(WHITE);
-    DrawText(*curr_word, 10, 10, 20, BLACK);
+
+    render_game_state();
     
-    int x = (WINDOW_WIDTH / 2) - (CHAR_SPACING * (word_len / 2));
-    int y = WINDOW_HEIGHT / 2;
-
-    for (int i = 0; i < word_len; i++) {
-      char c = (*curr_word)[i];
-      
-      sprintf(buf, "%c\0", c);
-      
-      Color color;
-      if (i == curr_letter_index) {
-	color = GOLD;
-      } else if (i < curr_letter_index) {
-	color = GRAY;
-      } else {
-	color = DARKGRAY;
-      }
-		 
-      DrawText(buf, x, y, 50, color);
-      x += CHAR_SPACING;
-    }
-
     DrawFPS(WINDOW_WIDTH - 100, 10); // top right
 
-    char wins_text[20];
-    snprintf(wins_text, 20, "%d wins", wins);
-    DrawText(wins_text, WINDOW_WIDTH - 100, WINDOW_HEIGHT - 20, 20, GRAY);
     EndDrawing();
   }