55 lines
1.3 KiB
Python
55 lines
1.3 KiB
Python
#
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# carkov markov chain library
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# © Copyright 2021 by Aldercone Studio <alderconestudio@gmail.com>
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# This is free software, see the included LICENSE for terms and conditions.
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#
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"""
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This module provides a few utility objects, especially the Abstract object which is used for terminals
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and other abstract tokens.
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"""
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class CarkovFilterException(BaseException):
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"""
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Base exception for filter stages.
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"""
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class Abort(CarkovFilterException):
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"""
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This exception is intended for a protocol by which filters can abort a particular token from being added to the
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stream.
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"""
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class AbortSegment(CarkovFilterException):
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"""
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This exception is intended for a protocol by which filters can abort an entire segment if a particular token would
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be rejected.
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"""
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class Abstract:
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"""
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This is used as a way to indicate abstract tokens in a stream of tokens.
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"""
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def __init__(self, name: str):
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self.name = name
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def __repr__(self) -> str:
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if self == NUMBER:
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return 'NUMBER'
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elif self == TERMINAL:
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return 'TERMINAL'
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return f"carkov.abstracts.Abstract({self.name})"
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NUMBER = Abstract("NUMBER")
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"""A universal Number abstract."""
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TERMINAL = Abstract("TERMINAL")
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"""A Universal Terminal abostract."""
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