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

src/parser/parsing_utils.h

@@ -19,33 +19,79 @@
         return NULL;                                                           \
     }
 
-/* @brief: parses a list of [and_or] rules, separated by semicolons.
+/* @brief Acts as the entry point of the parser, calls parse_list
+ */
+struct ast* parse_input(void);
+
+/* @brief: parses a list of [and_or] rules separated by semicolons and that
+ *         ends by a newline
+ *
+ * @code input = list '\n'
+ *             | list EOF
+ *             | '\n'
+ *             | EOF
+ *             ;
  */
 struct ast *parse_list(void);
 
-/* @brief Parses a simple list of words (command and arguments)
- * and returns the resulting ast
- */
-struct ast *parse_simple_command(void);
-
-/* 
- */
-struct ast *parse_if_rule(void);
-
-/*
- */
-struct ast *parse_shell_command(void);
-
-/* @brief parses commands inside if/else clauses and returns the corresponding
- * AST list
- */
-struct ast* parse_compound_list(void);
-
-/*
+/* @brief Only parses a pipeline rule for the moment
+ *
+ * @code and_or = pipeline ;
  */
 struct ast* parse_and_or(void);
 
-/*
+/* @brief Only parses a command rule for the moment
+ *
+ * @code pipeline = command ;
+ */
+struct ast* parse_pipeline(void);
+
+/* @brief Parses a simple command rule or a shell command rule depending on
+ *        the first token.
+ * @note
+ *        TOKEN_WORD => simple_command
+ *        TOKEN_IF => shell_command
+ *
+ * @code command = simple_command
+ *               | shell_command
+ *               ;
+ */
+struct ast* parse_command(void);
+
+/* @brief Parses a simple list of words (command and arguments)
+ *        ending by a separator
+ *
+ * @code simple_command = WORD { element } ;
+ */
+struct ast *parse_simple_command(void);
+
+
+/* @brief Only parses if rules for the moment
+ *
+ * @code shell_command = if_rule ;
+ */
+struct ast *parse_shell_command(void);
+
+
+/* @brief Parses a if rule (condition, then-clause, elif-clause, else-clause)
+ *
+ * @code if_rule = 'if' compound_list 'then' compound_list [else_clause] 'fi' ;
+ */
+struct ast *parse_if_rule(void);
+
+
+/* @brief parses commands inside if/else clauses and returns the corresponding
+ * AST list
+ *
+ * @code compound_list = {'\n'} and_or { ( ';' | '\n' ) {'\n'} and_or } [';'] {'\n'} ;
+ */
+struct ast* parse_compound_list(void);
+
+/* @brief
+ *
+ * @code else_clause = 'else' compound_list
+ *                   | 'elif' compound_list 'then' compound_list [else_clause]
+ *                   ;
  */
 struct ast* parse_else_clause(void);