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//opt/hc_python/lib64/python3.12/site-packages/build/_util.py

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from __future__ import annotations

import re

from collections.abc import Iterator, Set

_WHEEL_FILENAME_REGEX = re.compile(
    r'(?P<distribution>.+)-(?P<version>.+)'
    r'(-(?P<build_tag>.+))?-(?P<python_tag>.+)'
    r'-(?P<abi_tag>.+)-(?P<platform_tag>.+)\.whl'
)

def check_dependency(
    req_string: str, ancestral_req_strings: tuple[str, ...] = (), parent_extras: Set[str] = frozenset()
) -> Iterator[tuple[str, ...]]:
    """
    Verify that a dependency and all of its dependencies are met.

:param req_string: Requirement string
    :param parent_extras: Extras (eg. "test" in myproject[test])
    :yields: Unmet dependencies
    """
    import packaging.requirements

from ._compat import importlib

req = packaging.requirements.Requirement(req_string)
    normalised_req_string = str(req)

# ``Requirement`` doesn't implement ``__eq__`` so we cannot compare reqs for
    # equality directly but the string representation is stable.
    if normalised_req_string in ancestral_req_strings:
        # cyclical dependency, already checked.
        return

if req.marker:
        extras = frozenset(('',)).union(parent_extras)
        # a requirement can have multiple extras but ``evaluate`` can
        # only check one at a time.
        if all(not req.marker.evaluate(environment={'extra': e}) for e in extras):
            # if the marker conditions are not met, we pretend that the
            # dependency is satisfied.
            return

try:
        dist = importlib.metadata.distribution(req.name)
    except importlib.metadata.PackageNotFoundError:
        # dependency is not installed in the environment.
        yield (*ancestral_req_strings, normalised_req_string)
    else:
        if req.specifier and not req.specifier.contains(dist.version, prereleases=True):
            # the installed version is incompatible.
            yield (*ancestral_req_strings, normalised_req_string)
        elif dist.requires:
            for other_req_string in dist.requires:
                # yields transitive dependencies that are not satisfied.
                yield from check_dependency(other_req_string, (*ancestral_req_strings, normalised_req_string), req.extras)

def parse_wheel_filename(filename: str) -> re.Match[str] | None:
    return _WHEEL_FILENAME_REGEX.match(filename)

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Name	Size	Perms	Modified	Actions
_compat DIR	-	drwxr-xr-x	2025-07-16 14:55:51	Edit Download recursive recursive
__pycache__ DIR	-	drwxr-xr-x	2025-07-16 14:55:51	Edit Download recursive recursive
env.py	13.16 KB	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
py.typed	0 B	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
util.py	1.73 KB	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
_builder.py	13.15 KB	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
_ctx.py	2.81 KB	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
_exceptions.py	1.59 KB	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
_types.py	673 B	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
_util.py	2.27 KB	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
__init__.py	843 B	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive
__main__.py	13.89 KB	lrw-r--r--	2025-07-16 14:55:51	Edit Download recursive recursive

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