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#!/usr/bin/env python3
#
# _utils.py
"""
Private utility functions.
"""
#
# Copyright © 2021 Dominic Davis-Foster <dominic@davis-foster.co.uk>
#
# 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.
#
# stdlib
import functools
import os
import pathlib
import re
from typing import Callable, Iterator, Tuple, TypeVar
# 3rd party
from domdf_python_tools.paths import PathPlus
from packaging.utils import InvalidWheelFilename, canonicalize_name
from packaging.version import Version
_escaped_name_re = re.compile(r"^[\w\d._]*$", re.UNICODE)
SHOULD_CACHE = int(os.environ.get("DIST_META_CACHE", 1))
_C = TypeVar("_C", bound=Callable)
def _cache(func: _C) -> _C:
if SHOULD_CACHE:
return functools.lru_cache()(func) # type: ignore[return-value]
else: # pragma: no cover
return func
@_cache
def _canonicalize(name: str) -> str:
return canonicalize_name(name)
@_cache
def _parse_wheel_filename(filename: pathlib.PurePath) -> Tuple[str, Version]:
# From https://github.com/pypa/packaging
# This software is made available under the terms of *either* of the licenses
# found in LICENSE.APACHE or LICENSE.BSD. Contributions to this software is made
# under the terms of *both* these licenses.
if not filename.suffix == ".whl":
raise InvalidWheelFilename(f"Invalid wheel filename (extension must be '.whl'): {filename}")
stem = filename.stem
dashes = stem.count('-')
if dashes not in (4, 5):
raise InvalidWheelFilename(f"Invalid wheel filename (wrong number of parts): {filename}")
parts = stem.split('-', dashes - 2)
name = parts[0]
# See PEP 427 for the rules on escaping the project name
if "__" in name or _escaped_name_re.match(name) is None:
raise InvalidWheelFilename(f"Invalid project name: {name!r}")
version = _parse_version(parts[1])
return name, version
def _iter_dist_infos(basedir: PathPlus) -> Iterator[os.DirEntry]:
subdir: os.DirEntry
with os.scandir(os.fspath(basedir)) as sd:
for subdir in sd:
if not subdir.is_dir():
continue
if not subdir.name.endswith(".dist-info"):
continue
yield subdir
@_cache
def _parse_version(version: str) -> Version:
return Version(version)
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