mirror of
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59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
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# Copyright 2017 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Regular expression helpers."""
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import re
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def _CreateIdentifierRegex(parts):
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assert parts
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if parts[0]:
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# Allow word boundary or a _ prefix.
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prefix_pattern = r'\b_?'
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else:
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# Allow word boundary, _, or a case transition.
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prefix_pattern = r'(?:\b|(?<=_)|(?<=[a-z])(?=[A-Z]))'
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parts = parts[1:]
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assert parts
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if parts[-1]:
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# Allow word boundary, trailing _, or single trailing digit.
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suffix_pattern = r'\d?_?\b'
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else:
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# Allow word boundary, _, or a case transition.
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suffix_pattern = r'(?:\b|(?=_|\d)|(?<=[a-z])(?=[A-Z]))'
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parts = parts[:-1]
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assert parts
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shouty_pattern = '_'.join(a.upper() for a in parts)
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snake_pattern = '_'.join(a.lower() for a in parts)
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camel_remainder = parts[0][1:]
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for token in parts[1:]:
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camel_remainder += token.title()
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first_letter = parts[0][0]
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prefixed_pattern = '[a-z]' + first_letter.upper() + camel_remainder
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camel_pattern = '[%s%s]%s' % (first_letter.lower(), first_letter.upper(),
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camel_remainder)
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middle_patterns = '|'.join(
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(shouty_pattern, snake_pattern, prefixed_pattern, camel_pattern))
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return r'(?:%s(?:%s)%s)' % (prefix_pattern, middle_patterns, suffix_pattern)
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def ExpandRegexIdentifierPlaceholder(pattern):
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"""Expands {{identifier}} within a given regular expression.
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Returns |pattern|, with the addition that {{some_name}} is expanded to match:
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SomeName, kSomeName, SOME_NAME, etc.
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To match part of a name, use {{_some_name_}}. This will additionally match:
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kPrefixSomeNameSuffix, PREFIX_SOME_NAME_SUFFIX, etc.
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Note: SymbolGroup.Where* methods call this function already, so there is
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generally no need to call it directly.
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"""
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return re.sub(r'\{\{(.*?)\}\}',
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lambda m: _CreateIdentifierRegex(m.group(1).split('_')),
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pattern)
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