Source code for packaging.utils

# 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)
    NormalizedName = str

_canonicalize_regex = re.compile(r"[-_.]+")

[docs]def canonicalize_name(name): # type: (str) -> NormalizedName # This is taken from PEP 503. value = _canonicalize_regex.sub("-", name).lower() return cast("NormalizedName", value)
[docs]def canonicalize_version(version): # type: (Union[Version, str]) -> Union[Version, str] """ This is very similar to Version.__str__, but has one subtle difference with the way it handles the release segment. """ if not isinstance(version, Version): 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 is not None: parts.append(".post{0}".format( # Development release if is not None: parts.append(".dev{0}".format( # Local version segment if version.local is not None: parts.append("+{0}".format(version.local)) return "".join(parts)