Object
The entry point of parser. This method is used with #next_token. If Racc wants to get token (and its value), calls next_token.
-- # Example ---- inner def parse @q = [[1,1], [2,2], [3,3], [false, '$']] do_parse end def next_token @q.shift end --
[abstract method]
The method to fetch next token. If you use #do_parse method, you must implement #next_token. The format of return value is [TOKEN_SYMBOL, VALUE]. token-symbol is represented by Ruby's symbol by default, e.g. :IDENT for 'IDENT'. ";" (String) for ';'.
The final symbol (End of file) must be false.
The another entry point of parser. If you use this method, you must implement RECEIVER#METHOD_ID method.
RECEIVER#METHOD_ID is a method to get next token. It must 'yield's token, which format is [TOKEN-SYMBOL, VALUE].
This method is called when parse error is found.
ERROR_TOKEN_ID is an internal ID of token which caused error. You can get string replesentation of this ID by calling #token_to_str.
ERROR_VALUE is a value of error token.
value_stack is a stack of symbol values. DO NOT MODIFY this object.
This method raises ParseError by default.
If this method returns, parsers enter "error recovering mode".