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check.py

"""Validation of dependencies of packages
"""

import logging
from contextlib import suppress
from email.parser import Parser
from functools import reduce
from typing import (
    Callable,
    Dict,
    FrozenSet,
    Generator,
    Iterable,
    List,
    NamedTuple,
    Optional,
    Set,
    Tuple,
)

from pip._vendor.packaging.requirements import Requirement
from pip._vendor.packaging.tags import Tag, parse_tag
from pip._vendor.packaging.utils import NormalizedName, canonicalize_name
from pip._vendor.packaging.version import Version

from pip._internal.distributions import make_distribution_for_install_requirement
from pip._internal.metadata import get_default_environment
from pip._internal.metadata.base import BaseDistribution
from pip._internal.req.req_install import InstallRequirement

logger = logging.getLogger(__name__)

class PackageDetails(NamedTuple):
    version: Version
    dependencies: List[Requirement]

# Shorthands
PackageSet = Dict[NormalizedName, PackageDetails]
Missing = Tuple[NormalizedName, Requirement]
Conflicting = Tuple[NormalizedName, Version, Requirement]

MissingDict = Dict[NormalizedName, List[Missing]]
ConflictingDict = Dict[NormalizedName, List[Conflicting]]
CheckResult = Tuple[MissingDict, ConflictingDict]
ConflictDetails = Tuple[PackageSet, CheckResult]

def create_package_set_from_installed() -> Tuple[PackageSet, bool]:
    """Converts a list of distributions into a PackageSet."""
    package_set = {}
    problems = False
    env = get_default_environment()
    for dist in env.iter_installed_distributions(local_only=False, skip=()):
        name = dist.canonical_name
        try:
            dependencies = list(dist.iter_dependencies())
            package_set[name] = PackageDetails(dist.version, dependencies)
        except (OSError, ValueError) as e:
            # Don't crash on unreadable or broken metadata.
            logger.warning("Error parsing dependencies of %s: %s", name, e)
            problems = True
    return package_set, problems

def check_package_set(
    package_set: PackageSet, should_ignore: Optional[Callable[[str], bool]] = None
) -> CheckResult:
    """Check if a package set is consistent

If should_ignore is passed, it should be a callable that takes a
    package name and returns a boolean.
    """

missing = {}
    conflicting = {}

for package_name, package_detail in package_set.items():
        # Info about dependencies of package_name
        missing_deps: Set[Missing] = set()
        conflicting_deps: Set[Conflicting] = set()

if should_ignore and should_ignore(package_name):
            continue

for req in package_detail.dependencies:
            name = canonicalize_name(req.name)

# Check if it's missing
            if name not in package_set:
                missed = True
                if req.marker is not None:
                    missed = req.marker.evaluate({"extra": ""})
                if missed:
                    missing_deps.add((name, req))
                continue

# Check if there's a conflict
            version = package_set[name].version
            if not req.specifier.contains(version, prereleases=True):
                conflicting_deps.add((name, version, req))

if missing_deps:
            missing[package_name] = sorted(missing_deps, key=str)
        if conflicting_deps:
            conflicting[package_name] = sorted(conflicting_deps, key=str)

return missing, conflicting

def check_install_conflicts(to_install: List[InstallRequirement]) -> ConflictDetails:
    """For checking if the dependency graph would be consistent after \
    installing given requirements
    """
    # Start from the current state
    package_set, _ = create_package_set_from_installed()
    # Install packages
    would_be_installed = _simulate_installation_of(to_install, package_set)

# Only warn about directly-dependent packages; create a whitelist of them
    whitelist = _create_whitelist(would_be_installed, package_set)

return (
        package_set,
        check_package_set(
            package_set, should_ignore=lambda name: name not in whitelist
        ),
    )

def check_unsupported(
    packages: Iterable[BaseDistribution],
    supported_tags: Iterable[Tag],
) -> Generator[BaseDistribution, None, None]:
    for p in packages:
        with suppress(FileNotFoundError):
            wheel_file = p.read_text("WHEEL")
            wheel_tags: FrozenSet[Tag] = reduce(
                frozenset.union,
                map(parse_tag, Parser().parsestr(wheel_file).get_all("Tag", [])),
                frozenset(),
            )
            if wheel_tags.isdisjoint(supported_tags):
                yield p

def _simulate_installation_of(
    to_install: List[InstallRequirement], package_set: PackageSet
) -> Set[NormalizedName]:
    """Computes the version of packages after installing to_install."""
    # Keep track of packages that were installed
    installed = set()

# Modify it as installing requirement_set would (assuming no errors)
    for inst_req in to_install:
        abstract_dist = make_distribution_for_install_requirement(inst_req)
        dist = abstract_dist.get_metadata_distribution()
        name = dist.canonical_name
        package_set[name] = PackageDetails(dist.version, list(dist.iter_dependencies()))

installed.add(name)

return installed

def _create_whitelist(
    would_be_installed: Set[NormalizedName], package_set: PackageSet
) -> Set[NormalizedName]:
    packages_affected = set(would_be_installed)

for package_name in package_set:
        if package_name in packages_affected:
            continue

for req in package_set[package_name].dependencies:
            if canonicalize_name(req.name) in packages_affected:
                packages_affected.add(package_name)
                break

return packages_affected

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-05-15 05:02:28
..	dir	-	0755	2025-05-15 05:02:28
__pycache__	dir	-	0755	2025-06-07 05:00:42
build	dir	-	0755	2025-05-15 05:02:28
install	dir	-	0755	2025-05-15 05:02:28
__init__.py	application/x-empty	0 B	0644	2025-04-17 01:10:58
check.py	text/plain	5.77 KB	0644	2025-04-17 01:10:58
freeze.py	text/x-script.python	9.61 KB	0644	2025-04-17 01:10:58
prepare.py	text/plain	27.46 KB	0644	2025-04-17 01:10:58