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71 lines
1.6 KiB
71 lines
1.6 KiB
6 years ago
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Validator functions to use in patterns.
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All those function have last argument as match, so it's possible to use functools.partial to bind previous arguments.
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"""
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def chars_before(chars, match):
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"""
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Validate the match if left character is in a given sequence.
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:param chars:
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:type chars:
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:param match:
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:type match:
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:return:
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:rtype:
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"""
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if match.start <= 0:
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return True
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return match.input_string[match.start - 1] in chars
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def chars_after(chars, match):
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"""
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Validate the match if right character is in a given sequence.
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:param chars:
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:type chars:
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:param match:
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:type match:
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:return:
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:rtype:
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"""
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if match.end >= len(match.input_string):
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return True
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return match.input_string[match.end] in chars
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def chars_surround(chars, match):
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"""
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Validate the match if surrounding characters are in a given sequence.
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:param chars:
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:type chars:
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:param match:
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:type match:
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:return:
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:rtype:
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"""
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return chars_before(chars, match) and chars_after(chars, match)
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def validators(*chained_validators):
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"""
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Creates a validator chain from several validator functions.
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:param chained_validators:
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:type chained_validators:
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:return:
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:rtype:
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"""
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def validator_chain(match): # pylint:disable=missing-docstring
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for chained_validator in chained_validators:
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if not chained_validator(match):
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return False
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return True
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return validator_chain
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