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- """isort/natural.py.
-
- Enables sorting strings that contain numbers naturally
-
- usage:
- natural.nsorted(list)
-
- Copyright (C) 2013 Timothy Edmund Crosley
-
- Implementation originally from @HappyLeapSecond stack overflow user in response to:
- https://stackoverflow.com/questions/5967500/how-to-correctly-sort-a-string-with-a-number-inside
-
- Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
- documentation files (the "Software"), to deal in the Software without restriction, including without limitation
- the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
- to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
- The above copyright notice and this permission notice shall be included in all copies or
- substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
- TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
- CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- OTHER DEALINGS IN THE SOFTWARE.
-
- """
- import re
-
-
- def _atoi(text):
- return int(text) if text.isdigit() else text
-
-
- def _natural_keys(text):
- return [_atoi(c) for c in re.split(r'(\d+)', text)]
-
-
- def nsorted(to_sort, key=None):
- """Returns a naturally sorted list"""
- if key is None:
- key_callback = _natural_keys
- else:
- def key_callback(item):
- return _natural_keys(key(item))
-
- return sorted(to_sort, key=key_callback)
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