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File Name : utils.py

# 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)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-12-15 12:00:05
..	dir	-	root/root	drwxr-xr-x	2025-12-15 12:00:05
__pycache__	dir	-	root/root	drwxr-xr-x	2025-12-15 12:00:05
__about__.py	text/x-script.python	736 B	root/root	-rw-r--r--	2025-09-21 11:46:16
__init__.py	text/x-script.python	562 B	root/root	-rw-r--r--	2025-09-21 11:46:16
_compat.py	text/x-script.python	1.1 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
_structures.py	text/x-script.python	1.97 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
_typing.py	text/plain	1.77 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
markers.py	text/x-script.python	9.29 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
requirements.py	text/x-script.python	4.81 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
specifiers.py	text/x-script.python	31.2 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
tags.py	text/x-script.python	23.5 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
utils.py	text/x-script.python	1.77 KB	root/root	-rw-r--r--	2025-09-21 11:46:16
version.py	text/x-script.python	15.11 KB	root/root	-rw-r--r--	2025-09-21 11:46:16