49 lines
976 B
Python
49 lines
976 B
Python
"""
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Python Lexical Analyser
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Exception classes
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"""
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class PlexError(Exception):
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message = ""
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class PlexTypeError(PlexError, TypeError):
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pass
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class PlexValueError(PlexError, ValueError):
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pass
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class InvalidToken(PlexError):
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def __init__(self, token_number, message):
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PlexError.__init__(self, "Token number %d: %s" % (token_number, message))
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class InvalidScanner(PlexError):
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pass
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class AmbiguousAction(PlexError):
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message = "Two tokens with different actions can match the same string"
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def __init__(self):
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pass
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class UnrecognizedInput(PlexError):
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scanner = None
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position = None
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state_name = None
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def __init__(self, scanner, state_name):
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self.scanner = scanner
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self.position = scanner.get_position()
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self.state_name = state_name
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def __str__(self):
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return ("'%s', line %d, char %d: Token not recognised in state %r" % (
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self.position + (self.state_name,)))
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