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505 lines
14 KiB
505 lines
14 KiB
# 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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import collections
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import itertools
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import re
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import warnings
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from typing import Callable, Iterator, List, Optional, SupportsInt, Tuple, Union
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from ._structures import Infinity, InfinityType, NegativeInfinity, NegativeInfinityType
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__all__ = ["parse", "Version", "LegacyVersion", "InvalidVersion", "VERSION_PATTERN"]
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InfiniteTypes = Union[InfinityType, NegativeInfinityType]
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PrePostDevType = Union[InfiniteTypes, Tuple[str, int]]
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SubLocalType = Union[InfiniteTypes, int, str]
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LocalType = Union[
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NegativeInfinityType,
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Tuple[
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Union[
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SubLocalType,
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Tuple[SubLocalType, str],
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Tuple[NegativeInfinityType, SubLocalType],
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],
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...,
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],
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]
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CmpKey = Tuple[
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int, Tuple[int, ...], PrePostDevType, PrePostDevType, PrePostDevType, LocalType
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]
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LegacyCmpKey = Tuple[int, Tuple[str, ...]]
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VersionComparisonMethod = Callable[
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[Union[CmpKey, LegacyCmpKey], Union[CmpKey, LegacyCmpKey]], bool
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]
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_Version = collections.namedtuple(
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"_Version", ["epoch", "release", "dev", "pre", "post", "local"]
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)
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def parse(version: str) -> Union["LegacyVersion", "Version"]:
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"""
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Parse the given version string and return either a :class:`Version` object
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or a :class:`LegacyVersion` object depending on if the given version is
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a valid PEP 440 version or a legacy version.
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"""
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try:
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return Version(version)
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except InvalidVersion:
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return LegacyVersion(version)
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class InvalidVersion(ValueError):
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"""
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An invalid version was found, users should refer to PEP 440.
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"""
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class _BaseVersion:
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_key: Union[CmpKey, LegacyCmpKey]
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def __hash__(self) -> int:
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return hash(self._key)
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# Please keep the duplicated `isinstance` check
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# in the six comparisons hereunder
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# unless you find a way to avoid adding overhead function calls.
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def __lt__(self, other: "_BaseVersion") -> bool:
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if not isinstance(other, _BaseVersion):
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return NotImplemented
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return self._key < other._key
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def __le__(self, other: "_BaseVersion") -> bool:
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if not isinstance(other, _BaseVersion):
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return NotImplemented
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return self._key <= other._key
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def __eq__(self, other: object) -> bool:
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if not isinstance(other, _BaseVersion):
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return NotImplemented
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return self._key == other._key
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def __ge__(self, other: "_BaseVersion") -> bool:
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if not isinstance(other, _BaseVersion):
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return NotImplemented
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return self._key >= other._key
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def __gt__(self, other: "_BaseVersion") -> bool:
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if not isinstance(other, _BaseVersion):
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return NotImplemented
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return self._key > other._key
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def __ne__(self, other: object) -> bool:
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if not isinstance(other, _BaseVersion):
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return NotImplemented
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return self._key != other._key
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class LegacyVersion(_BaseVersion):
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def __init__(self, version: str) -> None:
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self._version = str(version)
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self._key = _legacy_cmpkey(self._version)
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warnings.warn(
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"Creating a LegacyVersion has been deprecated and will be "
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"removed in the next major release",
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DeprecationWarning,
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)
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def __str__(self) -> str:
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return self._version
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def __repr__(self) -> str:
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return f"<LegacyVersion('{self}')>"
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@property
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def public(self) -> str:
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return self._version
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@property
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def base_version(self) -> str:
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return self._version
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@property
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def epoch(self) -> int:
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return -1
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@property
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def release(self) -> None:
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return None
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@property
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def pre(self) -> None:
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return None
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@property
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def post(self) -> None:
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return None
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@property
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def dev(self) -> None:
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return None
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@property
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def local(self) -> None:
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return None
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@property
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def is_prerelease(self) -> bool:
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return False
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@property
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def is_postrelease(self) -> bool:
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return False
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@property
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def is_devrelease(self) -> bool:
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return False
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_legacy_version_component_re = re.compile(r"(\d+ | [a-z]+ | \.| -)", re.VERBOSE)
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_legacy_version_replacement_map = {
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"pre": "c",
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"preview": "c",
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"-": "final-",
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"rc": "c",
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"dev": "@",
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}
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def _parse_version_parts(s: str) -> Iterator[str]:
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for part in _legacy_version_component_re.split(s):
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part = _legacy_version_replacement_map.get(part, part)
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if not part or part == ".":
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continue
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if part[:1] in "0123456789":
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# pad for numeric comparison
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yield part.zfill(8)
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else:
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yield "*" + part
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# ensure that alpha/beta/candidate are before final
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yield "*final"
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def _legacy_cmpkey(version: str) -> LegacyCmpKey:
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# We hardcode an epoch of -1 here. A PEP 440 version can only have a epoch
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# greater than or equal to 0. This will effectively put the LegacyVersion,
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# which uses the defacto standard originally implemented by setuptools,
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# as before all PEP 440 versions.
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epoch = -1
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# This scheme is taken from pkg_resources.parse_version setuptools prior to
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# it's adoption of the packaging library.
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parts: List[str] = []
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for part in _parse_version_parts(version.lower()):
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if part.startswith("*"):
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# remove "-" before a prerelease tag
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if part < "*final":
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while parts and parts[-1] == "*final-":
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parts.pop()
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# remove trailing zeros from each series of numeric parts
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while parts and parts[-1] == "00000000":
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parts.pop()
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parts.append(part)
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return epoch, tuple(parts)
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# Deliberately not anchored to the start and end of the string, to make it
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# easier for 3rd party code to reuse
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VERSION_PATTERN = r"""
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v?
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(?:
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(?:(?P<epoch>[0-9]+)!)? # epoch
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(?P<release>[0-9]+(?:\.[0-9]+)*) # release segment
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(?P<pre> # pre-release
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[-_\.]?
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(?P<pre_l>(a|b|c|rc|alpha|beta|pre|preview))
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[-_\.]?
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(?P<pre_n>[0-9]+)?
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)?
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(?P<post> # post release
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(?:-(?P<post_n1>[0-9]+))
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(?:
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[-_\.]?
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(?P<post_l>post|rev|r)
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[-_\.]?
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(?P<post_n2>[0-9]+)?
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)
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)?
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(?P<dev> # dev release
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[-_\.]?
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(?P<dev_l>dev)
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[-_\.]?
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(?P<dev_n>[0-9]+)?
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)?
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)
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(?:\+(?P<local>[a-z0-9]+(?:[-_\.][a-z0-9]+)*))? # local version
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"""
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class Version(_BaseVersion):
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_regex = re.compile(r"^\s*" + VERSION_PATTERN + r"\s*$", re.VERBOSE | re.IGNORECASE)
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def __init__(self, version: str) -> None:
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# Validate the version and parse it into pieces
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match = self._regex.search(version)
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if not match:
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raise InvalidVersion(f"Invalid version: '{version}'")
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# Store the parsed out pieces of the version
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self._version = _Version(
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epoch=int(match.group("epoch")) if match.group("epoch") else 0,
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release=tuple(int(i) for i in match.group("release").split(".")),
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pre=_parse_letter_version(match.group("pre_l"), match.group("pre_n")),
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post=_parse_letter_version(
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match.group("post_l"), match.group("post_n1") or match.group("post_n2")
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),
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dev=_parse_letter_version(match.group("dev_l"), match.group("dev_n")),
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local=_parse_local_version(match.group("local")),
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)
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# Generate a key which will be used for sorting
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self._key = _cmpkey(
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self._version.epoch,
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self._version.release,
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self._version.pre,
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self._version.post,
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self._version.dev,
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self._version.local,
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)
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def __repr__(self) -> str:
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return f"<Version('{self}')>"
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def __str__(self) -> str:
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parts = []
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# Epoch
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if self.epoch != 0:
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parts.append(f"{self.epoch}!")
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# Release segment
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parts.append(".".join(str(x) for x in self.release))
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# Pre-release
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if self.pre is not None:
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parts.append("".join(str(x) for x in self.pre))
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# Post-release
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if self.post is not None:
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parts.append(f".post{self.post}")
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# Development release
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if self.dev is not None:
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parts.append(f".dev{self.dev}")
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# Local version segment
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if self.local is not None:
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parts.append(f"+{self.local}")
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return "".join(parts)
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@property
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def epoch(self) -> int:
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_epoch: int = self._version.epoch
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return _epoch
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@property
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def release(self) -> Tuple[int, ...]:
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_release: Tuple[int, ...] = self._version.release
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return _release
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@property
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def pre(self) -> Optional[Tuple[str, int]]:
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_pre: Optional[Tuple[str, int]] = self._version.pre
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return _pre
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@property
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def post(self) -> Optional[int]:
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return self._version.post[1] if self._version.post else None
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@property
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def dev(self) -> Optional[int]:
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return self._version.dev[1] if self._version.dev else None
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@property
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def local(self) -> Optional[str]:
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if self._version.local:
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return ".".join(str(x) for x in self._version.local)
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else:
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return None
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@property
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def public(self) -> str:
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return str(self).split("+", 1)[0]
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@property
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def base_version(self) -> str:
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parts = []
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# Epoch
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if self.epoch != 0:
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parts.append(f"{self.epoch}!")
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# Release segment
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parts.append(".".join(str(x) for x in self.release))
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return "".join(parts)
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@property
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def is_prerelease(self) -> bool:
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return self.dev is not None or self.pre is not None
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@property
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def is_postrelease(self) -> bool:
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return self.post is not None
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@property
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def is_devrelease(self) -> bool:
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return self.dev is not None
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@property
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def major(self) -> int:
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return self.release[0] if len(self.release) >= 1 else 0
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@property
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def minor(self) -> int:
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return self.release[1] if len(self.release) >= 2 else 0
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@property
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def micro(self) -> int:
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return self.release[2] if len(self.release) >= 3 else 0
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def _parse_letter_version(
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letter: str, number: Union[str, bytes, SupportsInt]
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) -> Optional[Tuple[str, int]]:
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if letter:
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# We consider there to be an implicit 0 in a pre-release if there is
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# not a numeral associated with it.
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if number is None:
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number = 0
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# We normalize any letters to their lower case form
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letter = letter.lower()
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# We consider some words to be alternate spellings of other words and
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# in those cases we want to normalize the spellings to our preferred
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# spelling.
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if letter == "alpha":
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letter = "a"
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elif letter == "beta":
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letter = "b"
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elif letter in ["c", "pre", "preview"]:
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letter = "rc"
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elif letter in ["rev", "r"]:
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letter = "post"
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return letter, int(number)
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if not letter and number:
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# We assume if we are given a number, but we are not given a letter
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# then this is using the implicit post release syntax (e.g. 1.0-1)
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letter = "post"
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return letter, int(number)
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return None
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_local_version_separators = re.compile(r"[\._-]")
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def _parse_local_version(local: str) -> Optional[LocalType]:
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"""
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Takes a string like abc.1.twelve and turns it into ("abc", 1, "twelve").
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"""
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if local is not None:
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return tuple(
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part.lower() if not part.isdigit() else int(part)
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for part in _local_version_separators.split(local)
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)
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return None
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def _cmpkey(
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epoch: int,
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release: Tuple[int, ...],
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pre: Optional[Tuple[str, int]],
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post: Optional[Tuple[str, int]],
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dev: Optional[Tuple[str, int]],
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local: Optional[Tuple[SubLocalType]],
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) -> CmpKey:
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# When we compare a release version, we want to compare it with all of the
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# trailing zeros removed. So we'll use a reverse the list, drop all the now
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# leading zeros until we come to something non zero, then take the rest
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# re-reverse it back into the correct order and make it a tuple and use
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# that for our sorting key.
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_release = tuple(
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reversed(list(itertools.dropwhile(lambda x: x == 0, reversed(release))))
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)
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# We need to "trick" the sorting algorithm to put 1.0.dev0 before 1.0a0.
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# We'll do this by abusing the pre segment, but we _only_ want to do this
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# if there is not a pre or a post segment. If we have one of those then
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# the normal sorting rules will handle this case correctly.
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if pre is None and post is None and dev is not None:
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_pre: PrePostDevType = NegativeInfinity
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# Versions without a pre-release (except as noted above) should sort after
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# those with one.
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elif pre is None:
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_pre = Infinity
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else:
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_pre = pre
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# Versions without a post segment should sort before those with one.
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if post is None:
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_post: PrePostDevType = NegativeInfinity
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else:
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_post = post
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# Versions without a development segment should sort after those with one.
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if dev is None:
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_dev: PrePostDevType = Infinity
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else:
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_dev = dev
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if local is None:
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# Versions without a local segment should sort before those with one.
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_local: LocalType = NegativeInfinity
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else:
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# Versions with a local segment need that segment parsed to implement
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# the sorting rules in PEP440.
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# - Alpha numeric segments sort before numeric segments
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# - Alpha numeric segments sort lexicographically
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# - Numeric segments sort numerically
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# - Shorter versions sort before longer versions when the prefixes
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# match exactly
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_local = tuple(
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(i, "") if isinstance(i, int) else (NegativeInfinity, i) for i in local
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)
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return epoch, _release, _pre, _post, _dev, _local
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