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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Thread safe fnmatch re-implementation.
Standard library fnmatch in Python versions <= 2.7.9 has thread safe
issue, this module is created for such case. see:
https://bugs.python.org/issue23191
.. versionadded:: 3.3
"""
from __future__ import absolute_import
import fnmatch as standard_fnmatch
import os
import posixpath
import re
import sys
if sys.version_info > (2, 7, 9):
fnmatch = standard_fnmatch.fnmatch
fnmatchcase = standard_fnmatch.fnmatchcase
filter = standard_fnmatch.filter
translate = standard_fnmatch.translate
else:
_MATCH_CACHE = {}
_MATCH_CACHE_MAX = 100
translate = standard_fnmatch.translate
def _get_cached_pattern(pattern):
cached_pattern = _MATCH_CACHE.get(pattern)
if cached_pattern is None:
translated_pattern = translate(pattern)
cached_pattern = re.compile(translated_pattern)
if len(_MATCH_CACHE) >= _MATCH_CACHE_MAX:
_MATCH_CACHE.clear()
_MATCH_CACHE[pattern] = cached_pattern
return cached_pattern
def fnmatchcase(filename, pattern):
cached_pattern = _get_cached_pattern(pattern)
return cached_pattern.match(filename) is not None
def fnmatch(filename, pattern):
filename = os.path.normcase(filename)
pattern = os.path.normcase(pattern)
return fnmatchcase(filename, pattern)
def filter(filenames, pattern):
filtered_filenames = []
pattern = os.path.normcase(pattern)
cached_pattern = _get_cached_pattern(pattern)
if os.path is posixpath:
# normcase on posix is NOP. Optimize it away from the loop.
for filename in filenames:
if cached_pattern.match(filename):
filtered_filenames.append(filename)
else:
for filename in filenames:
norm_name = os.path.normcase(filename)
if cached_pattern.match(norm_name):
filtered_filenames.append(filename)
return filtered_filenames
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