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repo2rlenv-swe-next

	# This file is dual licensed under the terms of the Apache License, Version
	# 2.0, and the BSD License. See the LICENSE file in the root of this repository
	# for complete details.
	from __future__ import annotations

	from typing import TYPE_CHECKING

	from ._parser import parse_requirement as _parse_requirement
	from ._tokenizer import ParserSyntaxError
	from .markers import Marker, _normalize_extra_values
	from .specifiers import InvalidSpecifier, SpecifierSet
	from .utils import canonicalize_name

	if TYPE_CHECKING:
	from collections.abc import Iterator

	__all__ = [
	"InvalidRequirement",
	"Requirement",
	]


	def __dir__() -> list[str]:
	return __all__


	class InvalidRequirement(ValueError):
	"""
	An invalid requirement was found, users should refer to PEP 508.

	.. versionadded:: 16.1
	"""


	class Requirement:
	"""Parse a requirement.

	Parse a given requirement string into its parts, such as name, specifier,
	URL, and extras. Raises InvalidRequirement on a badly-formed requirement
	string.

	.. versionadded:: 16.1

	.. versionchanged:: 22.0
	Added equality (``__eq__``) and hashing (``__hash__``) so requirements
	can be compared and stored in sets / dicts.

	.. versionchanged:: 23.2
	Equality and hashing began canonicalizing requirement names, so
	requirements whose names differ only by normalization (e.g.
	``Requirement("Foo")`` vs ``Requirement("foo")``) now compare and hash
	equal.

	Instances are safe to serialize with :mod:`pickle`. They use a stable
	format so the same pickle can be loaded in future packaging releases.

	.. versionchanged:: 26.2

	Added a stable pickle format. Pickles created with packaging 26.2+ can
	be unpickled with future releases. Backward compatibility with pickles
	from packaging < 26.2 is supported but may be removed in a future
	release.

	.. versionchanged:: 26.3

	The dedicated pickle support introduced in 26.2 did not preserve the
	specifier's explicit :attr:`~packaging.specifiers.SpecifierSet.prereleases`
	override; it is now included again.

	Equality and hashing normalize requirement names, extras, and
	equivalent specifiers. The string representation still preserves the
	parsed name and extras spelling.
	"""

	# TODO: Can we test whether something is contained within a requirement?
	# If so how do we do that? Do we need to test against the _name_ of
	# the thing as well as the version? What about the markers?
	# TODO: Can we normalize the name and extra name?

	__slots__ = ("extras", "marker", "name", "specifier", "url")

	def __init__(self, requirement_string: str) -> None:
	try:
	parsed = _parse_requirement(requirement_string)
	except ParserSyntaxError as e:
	raise InvalidRequirement(str(e)) from e

	self.name: str = parsed.name
	self.url: str \| None = parsed.url or None
	self.extras: set[str] = set(parsed.extras)
	try:
	self.specifier: SpecifierSet = SpecifierSet(parsed.specifier)
	except InvalidSpecifier as e:
	raise InvalidRequirement(str(e)) from e
	self.marker: Marker \| None = None
	if parsed.marker is not None:
	self.marker = Marker.__new__(Marker)
	self.marker._markers = _normalize_extra_values(parsed.marker)

	def _iter_parts(self, name: str) -> Iterator[str]:
	yield name

	if self.extras:
	formatted_extras = ",".join(sorted(self.extras))
	yield f"[{formatted_extras}]"

	if self.specifier:
	yield str(self.specifier)

	if self.url:
	yield f" @ {self.url}"
	if self.marker:
	yield " "

	if self.marker:
	yield f"; {self.marker}"

	def __getstate__(self) -> tuple[str, bool \| None]:
	# Return the requirement string for compactness and stability, paired
	# with the specifier's explicit prereleases override, which is not
	# captured by the string form. Re-parsed on load to reconstruct all
	# other fields.
	return (str(self), self.specifier._prereleases)

	def __setstate__(self, state: object) -> None:
	if isinstance(state, str):
	# Format (26.2): just the requirement string.
	requirement_string: str = state
	prereleases: bool \| None = None
	elif (
	isinstance(state, tuple)
	and len(state) == 2
	and isinstance(state[0], str)
	and (state[1] is None or isinstance(state[1], bool))
	):
	# New format (26.3+): (requirement string, specifier prereleases).
	requirement_string, prereleases = state
	elif isinstance(state, dict) and state.keys() >= set(self.__slots__):
	# Old format (packaging <= 26.1, no __slots__): plain __dict__.
	for key in self.__slots__:
	setattr(self, key, state[key])
	return
	else:
	raise TypeError(f"Cannot restore Requirement from {state!r}")

	try:
	tmp = Requirement(requirement_string)
	except InvalidRequirement as exc:
	raise TypeError(f"Cannot restore Requirement from {state!r}") from exc
	self.name = tmp.name
	self.url = tmp.url
	self.extras = tmp.extras
	self.specifier = tmp.specifier
	self.specifier._prereleases = prereleases
	self.marker = tmp.marker

	def __str__(self) -> str:
	return "".join(self._iter_parts(self.name))

	def __repr__(self) -> str:
	return f"<{self.__class__.__name__}({str(self)!r})>"

	def __hash__(self) -> int:
	# Mirror __eq__ by hashing the canonical specifier object rather than
	# its raw string. ``_iter_parts`` yields ``str(self.specifier)``, which
	# is non-canonical, so trailing-zero-equivalent requirements such as
	# ``foo==1.0.0`` and ``foo==1.0.0.0`` (which compare equal) would
	# otherwise hash differently, breaking the hash/__eq__ invariant.
	return hash(
	(
	canonicalize_name(self.name),
	frozenset(canonicalize_name(e) for e in self.extras),
	self.specifier,
	self.url,
	self.marker,
	)
	)

	def __eq__(self, other: object) -> bool:
	if not isinstance(other, Requirement):
	return NotImplemented

	# Extras must be normalized before comparison as per PEP 685.
	self_extras = frozenset(canonicalize_name(e) for e in self.extras)
	other_extras = frozenset(canonicalize_name(e) for e in other.extras)
	return (
	canonicalize_name(self.name) == canonicalize_name(other.name)
	and self_extras == other_extras
	and self.specifier == other.specifier
	and self.url == other.url
	and self.marker == other.marker
	)