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# This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import re from ._typing import TYPE_CHECKING, cast from .version import InvalidVersion, Version if TYPE_CHECKING: # pragma: no cover from typing import NewType, Union NormalizedName = NewType("NormalizedName", str) _canonicalize_regex = re.compile(r"[-_.]+") def canonicalize_name(name): # type: (str) -> NormalizedName # This is taken from PEP 503. value = _canonicalize_regex.sub("-", name).lower() return cast("NormalizedName", value) def canonicalize_version(_version): # type: (str) -> Union[Version, str] """ This is very similar to Version.__str__, but has one subtle difference with the way it handles the release segment. """ try: version = Version(_version) except InvalidVersion: # Legacy versions cannot be normalized return _version parts = [] # Epoch if version.epoch != 0: parts.append("{0}!".format(version.epoch)) # Release segment # NB: This strips trailing '.0's to normalize parts.append(re.sub(r"(\.0)+$", "", ".".join(str(x) for x in version.release))) # Pre-release if version.pre is not None: parts.append("".join(str(x) for x in version.pre)) # Post-release if version.post is not None: parts.append(".post{0}".format(version.post)) # Development release if version.dev is not None: parts.append(".dev{0}".format(version.dev)) # Local version segment if version.local is not None: parts.append("+{0}".format(version.local)) return "".join(parts)
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