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python38
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lib
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python3.8
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pip
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resolvelib
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requirements.py
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from pip._vendor.packaging.specifiers import SpecifierSet from pip._vendor.packaging.utils import NormalizedName, canonicalize_name from pip._internal.req.req_install import InstallRequirement from .base import Candidate, CandidateLookup, Requirement, format_name class ExplicitRequirement(Requirement): def __init__(self, candidate: Candidate) -> None: self.candidate = candidate def __str__(self) -> str: return str(self.candidate) def __repr__(self) -> str: return "{class_name}({candidate!r})".format( class_name=self.__class__.__name__, candidate=self.candidate, ) @property def project_name(self) -> NormalizedName: # No need to canonicalize - the candidate did this return self.candidate.project_name @property def name(self) -> str: # No need to canonicalize - the candidate did this return self.candidate.name def format_for_error(self) -> str: return self.candidate.format_for_error() def get_candidate_lookup(self) -> CandidateLookup: return self.candidate, None def is_satisfied_by(self, candidate: Candidate) -> bool: return candidate == self.candidate class SpecifierRequirement(Requirement): def __init__(self, ireq: InstallRequirement) -> None: assert ireq.link is None, "This is a link, not a specifier" self._ireq = ireq self._extras = frozenset(ireq.extras) def __str__(self) -> str: return str(self._ireq.req) def __repr__(self) -> str: return "{class_name}({requirement!r})".format( class_name=self.__class__.__name__, requirement=str(self._ireq.req), ) @property def project_name(self) -> NormalizedName: assert self._ireq.req, "Specifier-backed ireq is always PEP 508" return canonicalize_name(self._ireq.req.name) @property def name(self) -> str: return format_name(self.project_name, self._extras) def format_for_error(self) -> str: # Convert comma-separated specifiers into "A, B, ..., F and G" # This makes the specifier a bit more "human readable", without # risking a change in meaning. (Hopefully! Not all edge cases have # been checked) parts = [s.strip() for s in str(self).split(",")] if len(parts) == 0: return "" elif len(parts) == 1: return parts[0] return ", ".join(parts[:-1]) + " and " + parts[-1] def get_candidate_lookup(self) -> CandidateLookup: return None, self._ireq def is_satisfied_by(self, candidate: Candidate) -> bool: assert candidate.name == self.name, ( f"Internal issue: Candidate is not for this requirement " f"{candidate.name} vs {self.name}" ) # We can safely always allow prereleases here since PackageFinder # already implements the prerelease logic, and would have filtered out # prerelease candidates if the user does not expect them. assert self._ireq.req, "Specifier-backed ireq is always PEP 508" spec = self._ireq.req.specifier return spec.contains(candidate.version, prereleases=True) class RequiresPythonRequirement(Requirement): """A requirement representing Requires-Python metadata.""" def __init__(self, specifier: SpecifierSet, match: Candidate) -> None: self.specifier = specifier self._candidate = match def __str__(self) -> str: return f"Python {self.specifier}" def __repr__(self) -> str: return "{class_name}({specifier!r})".format( class_name=self.__class__.__name__, specifier=str(self.specifier), ) @property def project_name(self) -> NormalizedName: return self._candidate.project_name @property def name(self) -> str: return self._candidate.name def format_for_error(self) -> str: return str(self) def get_candidate_lookup(self) -> CandidateLookup: if self.specifier.contains(self._candidate.version, prereleases=True): return self._candidate, None return None, None def is_satisfied_by(self, candidate: Candidate) -> bool: assert candidate.name == self._candidate.name, "Not Python candidate" # We can safely always allow prereleases here since PackageFinder # already implements the prerelease logic, and would have filtered out # prerelease candidates if the user does not expect them. return self.specifier.contains(candidate.version, prereleases=True) class UnsatisfiableRequirement(Requirement): """A requirement that cannot be satisfied.""" def __init__(self, name: NormalizedName) -> None: self._name = name def __str__(self) -> str: return f"{self._name} (unavailable)" def __repr__(self) -> str: return "{class_name}({name!r})".format( class_name=self.__class__.__name__, name=str(self._name), ) @property def project_name(self) -> NormalizedName: return self._name @property def name(self) -> str: return self._name def format_for_error(self) -> str: return str(self) def get_candidate_lookup(self) -> CandidateLookup: return None, None def is_satisfied_by(self, candidate: Candidate) -> bool: return False