142 lines
5.1 KiB
Python
142 lines
5.1 KiB
Python
from typing import FrozenSet, Iterable, Optional, Tuple, Union
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from pip._vendor.packaging.specifiers import SpecifierSet
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from pip._vendor.packaging.utils import NormalizedName
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from pip._vendor.packaging.version import LegacyVersion, Version
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from pip._internal.models.link import Link, links_equivalent
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from pip._internal.req.req_install import InstallRequirement
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from pip._internal.utils.hashes import Hashes
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CandidateLookup = Tuple[Optional["Candidate"], Optional[InstallRequirement]]
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CandidateVersion = Union[LegacyVersion, Version]
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def format_name(project: NormalizedName, extras: FrozenSet[NormalizedName]) -> str:
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if not extras:
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return project
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extras_expr = ",".join(sorted(extras))
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return f"{project}[{extras_expr}]"
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class Constraint:
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def __init__(
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self, specifier: SpecifierSet, hashes: Hashes, links: FrozenSet[Link]
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) -> None:
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self.specifier = specifier
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self.hashes = hashes
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self.links = links
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@classmethod
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def empty(cls) -> "Constraint":
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return Constraint(SpecifierSet(), Hashes(), frozenset())
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@classmethod
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def from_ireq(cls, ireq: InstallRequirement) -> "Constraint":
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links = frozenset([ireq.link]) if ireq.link else frozenset()
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return Constraint(ireq.specifier, ireq.hashes(trust_internet=False), links)
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def __bool__(self) -> bool:
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return bool(self.specifier) or bool(self.hashes) or bool(self.links)
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def __and__(self, other: InstallRequirement) -> "Constraint":
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if not isinstance(other, InstallRequirement):
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return NotImplemented
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specifier = self.specifier & other.specifier
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hashes = self.hashes & other.hashes(trust_internet=False)
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links = self.links
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if other.link:
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links = links.union([other.link])
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return Constraint(specifier, hashes, links)
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def is_satisfied_by(self, candidate: "Candidate") -> bool:
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# Reject if there are any mismatched URL constraints on this package.
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if self.links and not all(_match_link(link, candidate) for link in self.links):
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return False
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# We can safely always allow prereleases here since PackageFinder
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# already implements the prerelease logic, and would have filtered out
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# prerelease candidates if the user does not expect them.
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return self.specifier.contains(candidate.version, prereleases=True)
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class Requirement:
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@property
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def project_name(self) -> NormalizedName:
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"""The "project name" of a requirement.
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This is different from ``name`` if this requirement contains extras,
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in which case ``name`` would contain the ``[...]`` part, while this
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refers to the name of the project.
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"""
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raise NotImplementedError("Subclass should override")
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@property
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def name(self) -> str:
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"""The name identifying this requirement in the resolver.
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This is different from ``project_name`` if this requirement contains
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extras, where ``project_name`` would not contain the ``[...]`` part.
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"""
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raise NotImplementedError("Subclass should override")
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def is_satisfied_by(self, candidate: "Candidate") -> bool:
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return False
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def get_candidate_lookup(self) -> CandidateLookup:
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raise NotImplementedError("Subclass should override")
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def format_for_error(self) -> str:
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raise NotImplementedError("Subclass should override")
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def _match_link(link: Link, candidate: "Candidate") -> bool:
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if candidate.source_link:
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return links_equivalent(link, candidate.source_link)
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return False
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class Candidate:
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@property
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def project_name(self) -> NormalizedName:
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"""The "project name" of the candidate.
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This is different from ``name`` if this candidate contains extras,
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in which case ``name`` would contain the ``[...]`` part, while this
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refers to the name of the project.
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"""
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raise NotImplementedError("Override in subclass")
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@property
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def name(self) -> str:
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"""The name identifying this candidate in the resolver.
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This is different from ``project_name`` if this candidate contains
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extras, where ``project_name`` would not contain the ``[...]`` part.
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"""
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raise NotImplementedError("Override in subclass")
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@property
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def version(self) -> CandidateVersion:
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raise NotImplementedError("Override in subclass")
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@property
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def is_installed(self) -> bool:
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raise NotImplementedError("Override in subclass")
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@property
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def is_editable(self) -> bool:
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raise NotImplementedError("Override in subclass")
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@property
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def source_link(self) -> Optional[Link]:
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raise NotImplementedError("Override in subclass")
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def iter_dependencies(self, with_requires: bool) -> Iterable[Optional[Requirement]]:
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raise NotImplementedError("Override in subclass")
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def get_install_requirement(self) -> Optional[InstallRequirement]:
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raise NotImplementedError("Override in subclass")
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def format_for_error(self) -> str:
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raise NotImplementedError("Subclass should override")
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