mirror of https://github.com/pypa/pip
131 lines
4.3 KiB
Python
131 lines
4.3 KiB
Python
from pip._vendor.packaging.utils import canonicalize_name
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from pip._internal.req.constructors import install_req_from_line
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from pip._internal.req.req_install import InstallRequirement
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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from .base import Candidate
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if MYPY_CHECK_RUNNING:
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from typing import Any, Dict, Optional, Sequence
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from pip._internal.models.link import Link
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from pip._internal.operations.prepare import RequirementPreparer
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from pip._internal.resolution.base import InstallRequirementProvider
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from pip._vendor.packaging.version import _BaseVersion
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from pip._vendor.pkg_resources import Distribution
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_CANDIDATE_CACHE = {} # type: Dict[Link, Candidate]
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def make_candidate(
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link, # type: Link
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preparer, # type: RequirementPreparer
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parent, # type: InstallRequirement
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make_install_req # type: InstallRequirementProvider
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):
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# type: (...) -> Candidate
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if link not in _CANDIDATE_CACHE:
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_CANDIDATE_CACHE[link] = LinkCandidate(
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link,
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preparer,
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parent=parent,
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make_install_req=make_install_req
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)
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return _CANDIDATE_CACHE[link]
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def make_install_req_from_link(link, parent):
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# type: (Link, InstallRequirement) -> InstallRequirement
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# TODO: Do we need to support editables?
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return install_req_from_line(
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link.url,
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comes_from=parent.comes_from,
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use_pep517=parent.use_pep517,
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isolated=parent.isolated,
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wheel_cache=parent._wheel_cache,
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constraint=parent.constraint,
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options=dict(
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install_options=parent.install_options,
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global_options=parent.global_options,
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hashes=parent.hash_options
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),
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)
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class LinkCandidate(Candidate):
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def __init__(
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self,
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link, # type: Link
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preparer, # type: RequirementPreparer
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parent, # type: InstallRequirement
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make_install_req, # type: InstallRequirementProvider
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):
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# type: (...) -> None
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self.link = link
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self._preparer = preparer
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self._ireq = make_install_req_from_link(link, parent)
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self._make_install_req = make_install_req
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self._name = None # type: Optional[str]
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self._version = None # type: Optional[_BaseVersion]
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self._dist = None # type: Optional[Distribution]
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def __eq__(self, other):
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# type: (Any) -> bool
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if isinstance(other, self.__class__):
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return self.link == other.link
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return False
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# Needed for Python 2, which does not implement this by default
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def __ne__(self, other):
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# type: (Any) -> bool
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return not self.__eq__(other)
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@property
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def name(self):
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# type: () -> str
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"""The normalised name of the project the candidate refers to"""
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if self._name is None:
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self._name = canonicalize_name(self.dist.project_name)
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return self._name
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@property
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def version(self):
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# type: () -> _BaseVersion
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if self._version is None:
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self._version = self.dist.parsed_version
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return self._version
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@property
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def dist(self):
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# type: () -> Distribution
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if self._dist is None:
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abstract_dist = self._preparer.prepare_linked_requirement(
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self._ireq
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)
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self._dist = abstract_dist.get_pkg_resources_distribution()
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# TODO: Only InstalledDistribution can return None here :-(
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assert self._dist is not None
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# These should be "proper" errors, not just asserts, as they
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# can result from user errors like a requirement "foo @ URL"
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# when the project at URL has a name of "bar" in its metadata.
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assert (self._name is None or
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self._name == canonicalize_name(self._dist.project_name))
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assert (self._version is None or
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self._version == self.dist.parsed_version)
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return self._dist
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def get_dependencies(self):
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# type: () -> Sequence[InstallRequirement]
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return [
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self._make_install_req(str(r), self._ireq)
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for r in self.dist.requires()
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]
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def get_install_requirement(self):
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# type: () -> InstallRequirement
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return self._ireq
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