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