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venv/Lib/site-packages/pip/_internal/metadata/pkg_resources.py

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+import email.message
+import logging
+import zipfile
+from typing import (
+    TYPE_CHECKING,
+    Collection,
+    Iterable,
+    Iterator,
+    List,
+    NamedTuple,
+    Optional,
+)
+
+from pip._vendor import pkg_resources
+from pip._vendor.packaging.requirements import Requirement
+from pip._vendor.packaging.utils import canonicalize_name
+from pip._vendor.packaging.version import parse as parse_version
+
+from pip._internal.utils import misc  # TODO: Move definition here.
+from pip._internal.utils.packaging import get_installer, get_metadata
+from pip._internal.utils.wheel import pkg_resources_distribution_for_wheel
+
+from .base import BaseDistribution, BaseEntryPoint, BaseEnvironment, DistributionVersion
+
+if TYPE_CHECKING:
+    from pip._vendor.packaging.utils import NormalizedName
+
+logger = logging.getLogger(__name__)
+
+
+class EntryPoint(NamedTuple):
+    name: str
+    value: str
+    group: str
+
+
+class Distribution(BaseDistribution):
+    def __init__(self, dist: pkg_resources.Distribution) -> None:
+        self._dist = dist
+
+    @classmethod
+    def from_wheel(cls, path: str, name: str) -> "Distribution":
+        with zipfile.ZipFile(path, allowZip64=True) as zf:
+            dist = pkg_resources_distribution_for_wheel(zf, name, path)
+        return cls(dist)
+
+    @property
+    def location(self) -> Optional[str]:
+        return self._dist.location
+
+    @property
+    def info_directory(self) -> Optional[str]:
+        return self._dist.egg_info
+
+    @property
+    def canonical_name(self) -> "NormalizedName":
+        return canonicalize_name(self._dist.project_name)
+
+    @property
+    def version(self) -> DistributionVersion:
+        return parse_version(self._dist.version)
+
+    @property
+    def installer(self) -> str:
+        return get_installer(self._dist)
+
+    @property
+    def editable(self) -> bool:
+        return misc.dist_is_editable(self._dist)
+
+    @property
+    def local(self) -> bool:
+        return misc.dist_is_local(self._dist)
+
+    @property
+    def in_usersite(self) -> bool:
+        return misc.dist_in_usersite(self._dist)
+
+    @property
+    def in_site_packages(self) -> bool:
+        return misc.dist_in_site_packages(self._dist)
+
+    def read_text(self, name: str) -> str:
+        if not self._dist.has_metadata(name):
+            raise FileNotFoundError(name)
+        return self._dist.get_metadata(name)
+
+    def iter_entry_points(self) -> Iterable[BaseEntryPoint]:
+        for group, entries in self._dist.get_entry_map().items():
+            for name, entry_point in entries.items():
+                name, _, value = str(entry_point).partition("=")
+                yield EntryPoint(name=name.strip(), value=value.strip(), group=group)
+
+    @property
+    def metadata(self) -> email.message.Message:
+        return get_metadata(self._dist)
+
+    def iter_dependencies(self, extras: Collection[str] = ()) -> Iterable[Requirement]:
+        if extras:  # pkg_resources raises on invalid extras, so we sanitize.
+            extras = frozenset(extras).intersection(self._dist.extras)
+        return self._dist.requires(extras)
+
+
+class Environment(BaseEnvironment):
+    def __init__(self, ws: pkg_resources.WorkingSet) -> None:
+        self._ws = ws
+
+    @classmethod
+    def default(cls) -> BaseEnvironment:
+        return cls(pkg_resources.working_set)
+
+    @classmethod
+    def from_paths(cls, paths: Optional[List[str]]) -> BaseEnvironment:
+        return cls(pkg_resources.WorkingSet(paths))
+
+    def _search_distribution(self, name: str) -> Optional[BaseDistribution]:
+        """Find a distribution matching the ``name`` in the environment.
+
+        This searches from *all* distributions available in the environment, to
+        match the behavior of ``pkg_resources.get_distribution()``.
+        """
+        canonical_name = canonicalize_name(name)
+        for dist in self.iter_distributions():
+            if dist.canonical_name == canonical_name:
+                return dist
+        return None
+
+    def get_distribution(self, name: str) -> Optional[BaseDistribution]:
+
+        # Search the distribution by looking through the working set.
+        dist = self._search_distribution(name)
+        if dist:
+            return dist
+
+        # If distribution could not be found, call working_set.require to
+        # update the working set, and try to find the distribution again.
+        # This might happen for e.g. when you install a package twice, once
+        # using setup.py develop and again using setup.py install. Now when
+        # running pip uninstall twice, the package gets removed from the
+        # working set in the first uninstall, so we have to populate the
+        # working set again so that pip knows about it and the packages gets
+        # picked up and is successfully uninstalled the second time too.
+        try:
+            # We didn't pass in any version specifiers, so this can never
+            # raise pkg_resources.VersionConflict.
+            self._ws.require(name)
+        except pkg_resources.DistributionNotFound:
+            return None
+        return self._search_distribution(name)
+
+    def _iter_distributions(self) -> Iterator[BaseDistribution]:
+        for dist in self._ws:
+            yield Distribution(dist)