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Krzysztof kuhy Rudnicki
f83c6feeaa
`types-requests==2.33.0.20260712` was reported as "not exact-pinned" against its own value: the regex capped the release segment at three components, and PyPI stub packages date-stamp a fourth. PEP 440 places no such limit. Found by running the gate over crdt-sync's newly pinned requirements.txt, which is the only manifest in the fleet with a four-part pin. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CRykabMwPgDzFHcARoqpaK
96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
"""Version parsing shared by every ecosystem adapter.
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The dangerous bug class here fails *green*: npm publishes pre-releases to
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`dist-tags.latest` and crates.io's `max_version` includes them, so an adapter
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that trusts either reports "up to date" while the pin is behind. Every
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"latest" that leaves this package goes through `newest_stable`.
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"""
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from __future__ import annotations
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import re
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from packaging.version import InvalidVersion, Version
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# Dart/pub and Go use semver; PyPI uses PEP 440. `packaging` parses both well
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# enough to compare, with this as the fallback for the odd Go pseudo-version.
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_SEMVER = re.compile(
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r"^v?(?P<core>\d+(?:\.\d+){0,2})"
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r"(?:-(?P<pre>[0-9A-Za-z.-]+))?"
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r"(?:\+(?P<build>[0-9A-Za-z.-]+))?$"
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)
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def parse(raw: str) -> Version | None:
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"""A comparable version, or None when the string is not one."""
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text = raw.strip().lstrip("v")
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try:
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return Version(text)
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except InvalidVersion:
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match = _SEMVER.match(raw.strip())
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if not match:
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return None
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# `core` is `\d+(\.\d+){0,2}`, which Version always accepts.
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return Version(match.group("core"))
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def is_prerelease(raw: str) -> bool:
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"""True for `1.2.0-beta.1`, `2.0.0rc1`, `1.0.0-dev` and friends.
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Checked on the raw string as well as the parsed object because PEP 440
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silently normalises some semver pre-release tags (`-alpha` survives, but
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an unknown suffix can be dropped) and a dropped suffix reads as stable.
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"""
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if "-" in raw.split("+", 1)[0].lstrip("v"):
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return True
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version = parse(raw)
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return bool(version and (version.is_prerelease or version.is_devrelease))
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def newest_stable(candidates) -> str | None:
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"""The highest non-pre-release version in `candidates`, or None."""
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best: tuple[Version, str] | None = None
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for raw in candidates:
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if not raw or is_prerelease(raw):
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continue
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version = parse(raw)
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if version is None:
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continue
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if best is None or version > best[0]:
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best = (version, str(raw).strip().lstrip("v"))
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return best[1] if best else None
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def behind(pinned: str, latest: str) -> bool:
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"""True when `pinned` is strictly older than `latest`.
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Unparseable input is never reported as behind: an unpinned or exotic
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constraint is a different finding (`UNPINNED`) and must not be dressed up
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as staleness.
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"""
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left, right = parse(pinned), parse(latest)
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if left is None or right is None:
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return False
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return left < right
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# Any number of numeric release components, not three: PyPI stub packages
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# date-stamp a fourth (`types-requests==2.33.0.20260712`), and capping at
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# three reported an exact pin as unpinned against itself.
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EXACT = re.compile(r"^\s*(?:==\s*)?v?\d+(?:\.\d+)*(?:[-+][0-9A-Za-z.-]+)?\s*$")
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def exact_pin(constraint: str) -> str | None:
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"""The version an exact constraint names, or None if it is a range.
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`1.6.0` and `==1.6.0` are exact; `^1.6.0`, `>=1.6.0`, `any` and `*` are
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not. A range is not comparable to a registry answer, which is the whole
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reason Q6 asked for exact pins.
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"""
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if not constraint:
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return None
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text = str(constraint).strip()
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if not EXACT.match(text):
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return None
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return text.lstrip("=").strip().lstrip("v")
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