feat(lexer): rework using a struct token and functions associated - unstable

src/lexer/lexer.c

@@ -28,31 +28,43 @@ static void save_state(char *stream, ssize_t i)
  */
 static bool is_special_char(char c)
 {
-    return c == '\'' || c == '\n' || c == ';';
+    return c == '\'' || c == '\n' || c == ';' || c == 'EOF';
 }
 
-/* @return: true if a keyword from the grammar was found, false otherwise.
- *
- */
-static bool is_keyword(char *stream, ssize_t i)
+static void new_token_keyword(struct token *tok, char *begin, ssize_t size)
 {
-    if (i == 2)
+    if (strncmp(begin, "if", size) == 0)
     {
-        return strcmp(stream, "if") == 0 || strcmp(stream, "fi") == 0;
+        tok->type = TOKEN_IF;
     }
-    if (i == 4)
+    if (strncmp(begin, "fi", size) == 0)
     {
-        return strcmp(stream, "then") || strcmp(stream, "else")
-            || strcmp(stream, "elif");
+        tok->type = TOKEN_FI;
+    }
+    if (strncmp(begin, "then", size) == 0)
+    {
+        tok->type = TOKEN_THEN;
+    }
+    if (strncmp(begin, "else", size) == 0)
+    {
+        tok->type = TOKEN_ELSE;
     }
-    return false;
 }
 
-char *new_token(char *begin, ssize_t size)
+struct token *new_token(char *begin, ssize_t size)
 {
-    char *res = calloc(size + 1, sizeof(char));
+    struct token *res = calloc(1, sizeof(struct token));
     if (res == NULL)
         return NULL;
+
+    // checks which type of token
+
+    // is special char
+
+    // is keyword
+
+    // otherwise -> WORD
+    char *token_data = calloc(size + 1, sizeof(char));
     strncpy(res, begin, size);
     return res;
 }
@@ -77,7 +89,7 @@ char *stream_init(void)
     return stream;
 }
 
-char *peek_token(void)
+struct token *peek_token(void)
 {
     char *stream = stream_init();
 
@@ -95,18 +107,13 @@ char *peek_token(void)
         {
             break;
         }
-        else if (is_keyword(stream, i))
-        {
-            i++;
-            break;
-        }
         i++;
     }
 
     return new_token(stream, i);
 }
 
-char *pop_token(void)
+struct token *pop_token(void)
 {
     char *stream = stream_init();
 
@@ -124,11 +131,6 @@ char *pop_token(void)
         {
             break;
         }
-        else if (is_keyword(stream, i))
-        {
-            i++;
-            break;
-        }
         i++;
     }
 

src/lexer/lexer.h

@@ -3,19 +3,38 @@
 
 #include <sys/types.h>
 
+enum token_type
+{
+    TOKEN_EOF,
+    TOKEN_WORD,
+    TOKEN_NEWLINE,
+    TOKEN_QUOTE,
+    TOKEN_SEMICOLON,
+    TOKEN_IF,
+    TOKEN_THEN,
+    TOKEN_ELSE,
+    TOKEN_FI
+};
+
+struct token
+{
+    enum token_type type;
+    char* data;
+};
+
 /*
  * @brief: returns the next (newly allocated) token without consuming it.
- *         if end of input is reached, returns EOF.
+ *         if end of input is reached, returns a token of type TOKEN_EOF.
  *
  */
-char *peek_token(void);
+struct token *peek_token(void);
 
 /*
  * @brief: returns the next (newly allocated) token and consumes it.
- *         if end of input is reached, returns EOF.
+ *         if end of input is reached, returns a token of type TOKEN_EOF.
  *
  */
-char *pop_token(void);
+struct token *pop_token(void);
 
 /*
  * @warning: NOT IMPLEMENTED.
@@ -23,16 +42,21 @@ char *pop_token(void);
  * @note: maybe usefull for subshells.
  */
 
-char *get_token_str(void);
+struct token *get_token_str(void);
 
 /*
- * @brief: return a newly allocated token.
- *         This token contains [size] chars, starting from [begin].
+ * @brief: return a newly allocated token, with the corresponding type.
+ *         The data contains [size] char, starting from [begin].
  *
- * @return: NULL on error, null-terminated char* otherwise.
+ * @return: NULL on error, a token otherwise.
  *
  */
-char *new_token(char *begin, ssize_t size);
+struct token *new_token(char *begin, ssize_t size);
+
+/* @brief: frees the token given in argument
+ *
+ */
+void free_token(struct token* tok);
 
 /*
  * @brief: checks if the stream used for the last token creation is empty.