docs: reworked parser header to fully comply with the given grammar and added a language representation for each parse_* function

src/parser/parsing_utils.c

@@ -47,6 +47,11 @@ static bool is_end_of_list(struct token *token)
 
 // === Functions
 
+struct ast *parse_input(void)
+{
+    return parse_list();
+}
+
 /* Parses a simple list of words (command and arguments)
  * and returns the resulting ast
  */
@@ -55,7 +60,7 @@ struct ast *parse_simple_command(void)
     struct list *command_elements = NULL;
     struct token *token = PEEK_TOKEN();
 
-    while (!isterminator(token))
+    while (token->type == TOKEN_WORD)
     {
         token = POP_TOKEN();
         command_elements = list_append(command_elements, token->data);