902133edd3
- 8 DB models (services, incidents, monitors, subscribers, etc.) - Full CRUD API for services, incidents, monitors - Public status page with live data - Incident detail page with timeline - API key authentication - Uptime monitoring scheduler - 13 tests passing - TECHNICAL_DESIGN.md with full spec
129 lines
4.3 KiB
Python
129 lines
4.3 KiB
Python
# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import annotations
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from typing import Iterator
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from ._parser import parse_requirement as _parse_requirement
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from ._tokenizer import ParserSyntaxError
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from .markers import Marker, _normalize_extra_values
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from .specifiers import SpecifierSet
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from .utils import canonicalize_name
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__all__ = [
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"InvalidRequirement",
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"Requirement",
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]
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def __dir__() -> list[str]:
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return __all__
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class InvalidRequirement(ValueError):
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"""
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An invalid requirement was found, users should refer to PEP 508.
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"""
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class Requirement:
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"""Parse a requirement.
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Parse a given requirement string into its parts, such as name, specifier,
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URL, and extras. Raises InvalidRequirement on a badly-formed requirement
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string.
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Instances are safe to serialize with :mod:`pickle`. They use a stable
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format so the same pickle can be loaded in future packaging releases.
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.. versionchanged:: 26.2
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Added a stable pickle format. Pickles created with packaging 26.2+ can
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be unpickled with future releases. Backward compatibility with pickles
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from packaging < 26.2 is supported but may be removed in a future
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release.
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"""
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# TODO: Can we test whether something is contained within a requirement?
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# If so how do we do that? Do we need to test against the _name_ of
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# the thing as well as the version? What about the markers?
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# TODO: Can we normalize the name and extra name?
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def __init__(self, requirement_string: str) -> None:
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try:
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parsed = _parse_requirement(requirement_string)
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except ParserSyntaxError as e:
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raise InvalidRequirement(str(e)) from e
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self.name: str = parsed.name
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self.url: str | None = parsed.url or None
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self.extras: set[str] = set(parsed.extras or [])
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self.specifier: SpecifierSet = SpecifierSet(parsed.specifier)
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self.marker: Marker | None = None
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if parsed.marker is not None:
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self.marker = Marker.__new__(Marker)
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self.marker._markers = _normalize_extra_values(parsed.marker)
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def _iter_parts(self, name: str) -> Iterator[str]:
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yield name
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if self.extras:
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formatted_extras = ",".join(sorted(self.extras))
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yield f"[{formatted_extras}]"
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if self.specifier:
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yield str(self.specifier)
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if self.url:
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yield f" @ {self.url}"
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if self.marker:
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yield " "
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if self.marker:
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yield f"; {self.marker}"
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def __getstate__(self) -> str:
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# Return the requirement string for compactness and stability.
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# Re-parsed on load to reconstruct all fields.
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return str(self)
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def __setstate__(self, state: object) -> None:
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if isinstance(state, str):
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# New format (26.2+): just the requirement string.
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try:
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tmp = Requirement(state)
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except InvalidRequirement as exc:
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raise TypeError(f"Cannot restore Requirement from {state!r}") from exc
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self.name = tmp.name
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self.url = tmp.url
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self.extras = tmp.extras
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self.specifier = tmp.specifier
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self.marker = tmp.marker
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return
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if isinstance(state, dict):
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# Old format (packaging <= 26.1, no __slots__): plain __dict__.
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self.__dict__.update(state)
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return
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raise TypeError(f"Cannot restore Requirement from {state!r}")
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def __str__(self) -> str:
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return "".join(self._iter_parts(self.name))
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def __repr__(self) -> str:
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return f"<{self.__class__.__name__}({str(self)!r})>"
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def __hash__(self) -> int:
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return hash(tuple(self._iter_parts(canonicalize_name(self.name))))
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def __eq__(self, other: object) -> bool:
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if not isinstance(other, Requirement):
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return NotImplemented
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return (
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canonicalize_name(self.name) == canonicalize_name(other.name)
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and self.extras == other.extras
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and self.specifier == other.specifier
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and self.url == other.url
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and self.marker == other.marker
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)
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