feat(lexer): operators done

src/lexer/lexer_utils.h

@@ -53,11 +53,16 @@ enum token_type
     TOKEN_RIGHT_BRACKET,
 
     // redirections
-    TOKEN_LESS,
-    TOKEN_GREATER,
-    TOKEN_PIPE,
-    TOKEN_AMPERSAND,
+    TOKEN_REDIR_LEFT,
+    TOKEN_REDIR_RIGHT,
+    TOKEN_REDIR_LEFT_RIGHT,
+    TOKEN_REDIR_DOUBLE_RIGHT,
+    TOKEN_REDIR_LEFT_AMP,
+    TOKEN_REDIR_RIGHT_AMP,
+    TOKEN_REDIR_RIGHT_PIPE,
+
     TOKEN_IONUMBER,
+    TOKEN_PIPE,
 
     // Keywords
     TOKEN_IF,
@@ -75,8 +80,12 @@ struct token
     char *data;
 };
 
-/*
- * @brief: return a newly allocated token, with the corresponding type.
+/* @return: true if a special character from the grammar was found,
+ *          false otherwise.
+ */
+bool is_special_char(char c);
+
+/* @brief: return a newly allocated token, with the corresponding type.
  *         The data contains [size] char, starting from [begin].
  *
  * @return: NULL on error, a token otherwise.
@@ -99,13 +108,22 @@ void free_token(struct token **tok);
 void stream_init(struct lexer_context *ctx);
 
 /* @brief: finds the next '\n' or EOF character,
- * starting at [ctx->end_previous_token],
- * and updates the stream and remaining_chars accordingly.
+ *         starting at [ctx->end_previous_token],
+ *         and updates the stream and remaining_chars accordingly.
+ *
+ * @note: Daft Punk. bang.
  */
 void go_end_of_line(struct lexer_context *ctx);
 
-/*
- * @brief: drops the current stream and asks IOB for a new one
+/* @brief: this function is called when we found a special character
+ *         in the stream. This can either be an operator (ig '>>' or '<&' etc),
+ *         or a special char (ig '\' or '#' etc).
+ * @return: the length of the operator/special char found (can be 1, 2 or 3).
+ *          -1 on error.
+ */
+ssize_t len_op_sepchar(char *stream, ssize_t i);
+
+/* @brief: drops the current stream and asks IOB for a new one
  */
 void get_next_stream(struct lexer_context *ctx);