# 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.
import collections import itertools import re import warnings from typing import Callable, Iterator, List, Optional, SupportsInt, Tuple, Union
from ._structures import Infinity, InfinityType, NegativeInfinity, NegativeInfinityType
def parse(version: str) -> Union["LegacyVersion", "Version"]: """
Parse the given version string andreturn either a :class:`Version` object or a :class:`LegacyVersion` object depending on if the given version is
a valid PEP 440 version or a legacy version. """ try: return Version(version) except InvalidVersion: return LegacyVersion(version)
class InvalidVersion(ValueError): """
An invalid version was found, users should refer to PEP 440. """
class _BaseVersion:
_key: Union[CmpKey, LegacyCmpKey]
def __hash__(self) -> int: return hash(self._key)
# Please keep the duplicated `isinstance` check # in the six comparisons hereunder # unless you find a way to avoid adding overhead function calls. def __lt__(self, other: "_BaseVersion") -> bool: ifnot isinstance(other, _BaseVersion): return NotImplemented
def _parse_version_parts(s: str) -> Iterator[str]: for part in _legacy_version_component_re.split(s):
part = _legacy_version_replacement_map.get(part, part)
ifnot part or part == ".": continue
if part[:1] in"0123456789": # pad for numeric comparison yield part.zfill(8) else: yield"*" + part
# ensure that alpha/beta/candidate are before final yield"*final"
def _legacy_cmpkey(version: str) -> LegacyCmpKey:
# We hardcode an epoch of -1 here. A PEP 440 version can only have a epoch # greater than or equal to 0. This will effectively put the LegacyVersion, # which uses the defacto standard originally implemented by setuptools, # as before all PEP 440 versions.
epoch = -1
# This scheme is taken from pkg_resources.parse_version setuptools prior to # it's adoption of the packaging library.
parts: List[str] = [] for part in _parse_version_parts(version.lower()): if part.startswith("*"): # remove "-" before a prerelease tag if part < "*final": while parts and parts[-1] == "*final-":
parts.pop()
# remove trailing zeros from each series of numeric parts while parts and parts[-1] == "00000000":
parts.pop()
parts.append(part)
return epoch, tuple(parts)
# Deliberately not anchored to the start and end of the string, to make it # easier for 3rd party code to reuse
VERSION_PATTERN = r"""
v?
(?:
(?:(?P<epoch>[0-9]+)!)? # epoch
(?P<release>[0-9]+(?:\.[0-9]+)*) # release segment
(?P<pre> # pre-release
[-_\.]?
(?P<pre_l>(a|b|c|rc|alpha|beta|pre|preview))
[-_\.]?
(?P<pre_n>[0-9]+)?
)?
(?P<post> # post release
(?:-(?P<post_n1>[0-9]+))
|
(?:
[-_\.]?
(?P<post_l>post|rev|r)
[-_\.]?
(?P<post_n2>[0-9]+)?
)
)?
(?P<dev> # dev release
[-_\.]?
(?P<dev_l>dev)
[-_\.]?
(?P<dev_n>[0-9]+)?
)?
)
(?:\+(?P<local>[a-z0-9]+(?:[-_\.][a-z0-9]+)*))? # local version """
# Validate the version and parse it into pieces
match = self._regex.search(version) ifnot match: raise InvalidVersion(f"Invalid version: '{version}'")
# Store the parsed out pieces of the version
self._version = _Version(
epoch=int(match.group("epoch")) if match.group("epoch") else 0,
release=tuple(int(i) for i in match.group("release").split(".")),
pre=_parse_letter_version(match.group("pre_l"), match.group("pre_n")),
post=_parse_letter_version(
match.group("post_l"), match.group("post_n1") or match.group("post_n2")
),
dev=_parse_letter_version(match.group("dev_l"), match.group("dev_n")),
local=_parse_local_version(match.group("local")),
)
# Generate a key which will be used for sorting
self._key = _cmpkey(
self._version.epoch,
self._version.release,
self._version.pre,
self._version.post,
self._version.dev,
self._version.local,
)
def __repr__(self) -> str: return f""
def __str__(self) -> str:
parts = []
# Epoch if self.epoch != 0:
parts.append(f"{self.epoch}!")
# Release segment
parts.append(".".join(str(x) for x in self.release))
# Pre-release if self.pre isnotNone:
parts.append("".join(str(x) for x in self.pre))
# Post-release if self.post isnotNone:
parts.append(f".post{self.post}")
# Development release if self.dev isnotNone:
parts.append(f".dev{self.dev}")
# Local version segment if self.local isnotNone:
parts.append(f"+{self.local}")
if letter: # We consider there to be an implicit 0 in a pre-release if there is # not a numeral associated with it. if number isNone:
number = 0
# We normalize any letters to their lower case form
letter = letter.lower()
# We consider some words to be alternate spellings of other words and # in those cases we want to normalize the spellings to our preferred # spelling. if letter == "alpha":
letter = "a" elif letter == "beta":
letter = "b" elif letter in ["c", "pre", "preview"]:
letter = "rc" elif letter in ["rev", "r"]:
letter = "post"
return letter, int(number) ifnot letter and number: # We assume if we are given a number, but we are not given a letter # then this is using the implicit post release syntax (e.g. 1.0-1)
letter = "post"
return letter, int(number)
returnNone
_local_version_separators = re.compile(r"[\._-]")
def _parse_local_version(local: str) -> Optional[LocalType]: """
Takes a string like abc.1.twelve and turns it into ("abc", 1, "twelve"). """ if local isnotNone: return tuple(
part.lower() ifnot part.isdigit() else int(part) for part in _local_version_separators.split(local)
) returnNone
# When we compare a release version, we want to compare it with all of the # trailing zeros removed. So we'll use a reverse the list, drop all the now # leading zeros until we come to something non zero, then take the rest # re-reverse it back into the correct order and make it a tuple and use # that for our sorting key.
_release = tuple(
reversed(list(itertools.dropwhile(lambda x: x == 0, reversed(release))))
)
# We need to "trick" the sorting algorithm to put 1.0.dev0 before 1.0a0. # We'll do this by abusing the pre segment, but we _only_ want to do this # if there is not a pre or a post segment. If we have one of those then # the normal sorting rules will handle this case correctly. if pre isNoneand post isNoneand dev isnotNone:
_pre: PrePostDevType = NegativeInfinity # Versions without a pre-release (except as noted above) should sort after # those with one. elif pre isNone:
_pre = Infinity else:
_pre = pre
# Versions without a post segment should sort before those with one. if post isNone:
_post: PrePostDevType = NegativeInfinity
else:
_post = post
# Versions without a development segment should sort after those with one. if dev isNone:
_dev: PrePostDevType = Infinity
else:
_dev = dev
if local isNone: # Versions without a local segment should sort before those with one.
_local: LocalType = NegativeInfinity else: # Versions with a local segment need that segment parsed to implement # the sorting rules in PEP440. # - Alpha numeric segments sort before numeric segments # - Alpha numeric segments sort lexicographically # - Numeric segments sort numerically # - Shorter versions sort before longer versions when the prefixes # match exactly
_local = tuple(
(i, "") if isinstance(i, int) else (NegativeInfinity, i) for i in local
)
return epoch, _release, _pre, _post, _dev, _local
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