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/usr/lib/python3/dist-packages/Cython/Plex/Errors.py is in cython3 0.25.2-1.

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#=======================================================================
#
#   Python Lexical Analyser
#
#   Exception classes
#
#=======================================================================


class PlexError(Exception):
    message = ""


class PlexTypeError(PlexError, TypeError):
    pass


class PlexValueError(PlexError, ValueError):
    pass


class InvalidRegex(PlexError):
    pass


class InvalidToken(PlexError):
    def __init__(self, token_number, message):
        PlexError.__init__(self, "Token number %d: %s" % (token_number, message))


class InvalidScanner(PlexError):
    pass


class AmbiguousAction(PlexError):
    message = "Two tokens with different actions can match the same string"

    def __init__(self):
        pass


class UnrecognizedInput(PlexError):
    scanner = None
    position = None
    state_name = None

    def __init__(self, scanner, state_name):
        self.scanner = scanner
        self.position = scanner.get_position()
        self.state_name = state_name

    def __str__(self):
        return ("'%s', line %d, char %d: Token not recognised in state %r" % (
            self.position + (self.state_name,)))