class ParserGeneratorError(Exception):
    pass


class LexingError(Exception):
    """
    Raised by a Lexer, if no rule matches.
    """
    def __init__(self, message, source_pos):
        self.message = message
        self.source_pos = source_pos

    def getsourcepos(self):
        """
        Returns the position in the source, at which this error occurred.
        """
        return self.source_pos


class ParsingError(Exception):
    """
    Raised by a Parser, if no production rule can be applied.
    """
    def __init__(self, message, source_pos):
        self.message = message
        self.source_pos = source_pos

    def getsourcepos(self):
        """
        Returns the position in the source, at which this error occurred.
        """
        return self.source_pos


class ParserGeneratorWarning(Warning):
    pass