mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-01 09:46:09 +03:00
59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
# Copyright 2017 The Chromium Authors. All rights reserved.
|
|
# Use of this source code is governed by a BSD-style license that can be
|
|
# found in the LICENSE file.
|
|
|
|
"""Regular expression helpers."""
|
|
|
|
import re
|
|
|
|
|
|
def _CreateIdentifierRegex(parts):
|
|
assert parts
|
|
if parts[0]:
|
|
# Allow word boundary or a _ prefix.
|
|
prefix_pattern = r'\b_?'
|
|
else:
|
|
# Allow word boundary, _, or a case transition.
|
|
prefix_pattern = r'(?:\b|(?<=_)|(?<=[a-z])(?=[A-Z]))'
|
|
parts = parts[1:]
|
|
assert parts
|
|
|
|
if parts[-1]:
|
|
# Allow word boundary, trailing _, or single trailing digit.
|
|
suffix_pattern = r'\d?_?\b'
|
|
else:
|
|
# Allow word boundary, _, or a case transition.
|
|
suffix_pattern = r'(?:\b|(?=_|\d)|(?<=[a-z])(?=[A-Z]))'
|
|
parts = parts[:-1]
|
|
assert parts
|
|
|
|
shouty_pattern = '_'.join(a.upper() for a in parts)
|
|
snake_pattern = '_'.join(a.lower() for a in parts)
|
|
camel_remainder = parts[0][1:]
|
|
for token in parts[1:]:
|
|
camel_remainder += token.title()
|
|
first_letter = parts[0][0]
|
|
prefixed_pattern = '[a-z]' + first_letter.upper() + camel_remainder
|
|
camel_pattern = '[%s%s]%s' % (first_letter.lower(), first_letter.upper(),
|
|
camel_remainder)
|
|
middle_patterns = '|'.join(
|
|
(shouty_pattern, snake_pattern, prefixed_pattern, camel_pattern))
|
|
return r'(?:%s(?:%s)%s)' % (prefix_pattern, middle_patterns, suffix_pattern)
|
|
|
|
|
|
def ExpandRegexIdentifierPlaceholder(pattern):
|
|
"""Expands {{identifier}} within a given regular expression.
|
|
|
|
Returns |pattern|, with the addition that {{some_name}} is expanded to match:
|
|
SomeName, kSomeName, SOME_NAME, etc.
|
|
|
|
To match part of a name, use {{_some_name_}}. This will additionally match:
|
|
kPrefixSomeNameSuffix, PREFIX_SOME_NAME_SUFFIX, etc.
|
|
|
|
Note: SymbolGroup.Where* methods call this function already, so there is
|
|
generally no need to call it directly.
|
|
"""
|
|
return re.sub(r'\{\{(.*?)\}\}',
|
|
lambda m: _CreateIdentifierRegex(m.group(1).split('_')),
|
|
pattern)
|