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version.py

# 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

__all__ = ["parse", "Version", "LegacyVersion", "InvalidVersion", "VERSION_PATTERN"]

InfiniteTypes = Union[InfinityType, NegativeInfinityType]
PrePostDevType = Union[InfiniteTypes, Tuple[str, int]]
SubLocalType = Union[InfiniteTypes, int, str]
LocalType = Union[
    NegativeInfinityType,
    Tuple[
        Union[
            SubLocalType,
            Tuple[SubLocalType, str],
            Tuple[NegativeInfinityType, SubLocalType],
        ],
        ...,
    ],
]
CmpKey = Tuple[
    int, Tuple[int, ...], PrePostDevType, PrePostDevType, PrePostDevType, LocalType
]
LegacyCmpKey = Tuple[int, Tuple[str, ...]]
VersionComparisonMethod = Callable[
    [Union[CmpKey, LegacyCmpKey], Union[CmpKey, LegacyCmpKey]], bool
]

_Version = collections.namedtuple(
    "_Version", ["epoch", "release", "dev", "pre", "post", "local"]
)

def parse(version: str) -> Union["LegacyVersion", "Version"]:
    """
    Parse the given version string and return 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:
        if not isinstance(other, _BaseVersion):
            return NotImplemented

return self._key < other._key

def __le__(self, other: "_BaseVersion") -> bool:
        if not isinstance(other, _BaseVersion):
            return NotImplemented

return self._key <= other._key

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

return self._key == other._key

def __ge__(self, other: "_BaseVersion") -> bool:
        if not isinstance(other, _BaseVersion):
            return NotImplemented

return self._key >= other._key

def __gt__(self, other: "_BaseVersion") -> bool:
        if not isinstance(other, _BaseVersion):
            return NotImplemented

return self._key > other._key

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

return self._key != other._key

class LegacyVersion(_BaseVersion):
    def __init__(self, version: str) -> None:
        self._version = str(version)
        self._key = _legacy_cmpkey(self._version)

warnings.warn(
            "Creating a LegacyVersion has been deprecated and will be "
            "removed in the next major release",
            DeprecationWarning,
        )

def __str__(self) -> str:
        return self._version

def __repr__(self) -> str:
        return f"<LegacyVersion('{self}')>"

@property
    def public(self) -> str:
        return self._version

@property
    def base_version(self) -> str:
        return self._version

@property
    def epoch(self) -> int:
        return -1

@property
    def release(self) -> None:
        return None

@property
    def pre(self) -> None:
        return None

@property
    def post(self) -> None:
        return None

@property
    def dev(self) -> None:
        return None

@property
    def local(self) -> None:
        return None

@property
    def is_prerelease(self) -> bool:
        return False

@property
    def is_postrelease(self) -> bool:
        return False

@property
    def is_devrelease(self) -> bool:
        return False

_legacy_version_component_re = re.compile(r"(\d+ | [a-z]+ | \.| -)", re.VERBOSE)

_legacy_version_replacement_map = {
    "pre": "c",
    "preview": "c",
    "-": "final-",
    "rc": "c",
    "dev": "@",
}

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)

if not 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
"""

class Version(_BaseVersion):

_regex = re.compile(r"^\s*" + VERSION_PATTERN + r"\s*$", re.VERBOSE | re.IGNORECASE)

def __init__(self, version: str) -> None:

# Validate the version and parse it into pieces
        match = self._regex.search(version)
        if not 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"<Version('{self}')>"

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 is not None:
            parts.append("".join(str(x) for x in self.pre))

# Post-release
        if self.post is not None:
            parts.append(f".post{self.post}")

# Development release
        if self.dev is not None:
            parts.append(f".dev{self.dev}")

# Local version segment
        if self.local is not None:
            parts.append(f"+{self.local}")

return "".join(parts)

@property
    def epoch(self) -> int:
        _epoch: int = self._version.epoch
        return _epoch

@property
    def release(self) -> Tuple[int, ...]:
        _release: Tuple[int, ...] = self._version.release
        return _release

@property
    def pre(self) -> Optional[Tuple[str, int]]:
        _pre: Optional[Tuple[str, int]] = self._version.pre
        return _pre

@property
    def post(self) -> Optional[int]:
        return self._version.post[1] if self._version.post else None

@property
    def dev(self) -> Optional[int]:
        return self._version.dev[1] if self._version.dev else None

@property
    def local(self) -> Optional[str]:
        if self._version.local:
            return ".".join(str(x) for x in self._version.local)
        else:
            return None

@property
    def public(self) -> str:
        return str(self).split("+", 1)[0]

@property
    def base_version(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))

return "".join(parts)

@property
    def is_prerelease(self) -> bool:
        return self.dev is not None or self.pre is not None

@property
    def is_postrelease(self) -> bool:
        return self.post is not None

@property
    def is_devrelease(self) -> bool:
        return self.dev is not None

@property
    def major(self) -> int:
        return self.release[0] if len(self.release) >= 1 else 0

@property
    def minor(self) -> int:
        return self.release[1] if len(self.release) >= 2 else 0

@property
    def micro(self) -> int:
        return self.release[2] if len(self.release) >= 3 else 0

def _parse_letter_version(
    letter: str, number: Union[str, bytes, SupportsInt]
) -> Optional[Tuple[str, int]]:

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 is None:
            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)
    if not 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)

return None

_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 is not None:
        return tuple(
            part.lower() if not part.isdigit() else int(part)
            for part in _local_version_separators.split(local)
        )
    return None

def _cmpkey(
    epoch: int,
    release: Tuple[int, ...],
    pre: Optional[Tuple[str, int]],
    post: Optional[Tuple[str, int]],
    dev: Optional[Tuple[str, int]],
    local: Optional[Tuple[SubLocalType]],
) -> CmpKey:

# 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 is None and post is None and dev is not None:
        _pre: PrePostDevType = NegativeInfinity
    # Versions without a pre-release (except as noted above) should sort after
    # those with one.
    elif pre is None:
        _pre = Infinity
    else:
        _pre = pre

# Versions without a post segment should sort before those with one.
    if post is None:
        _post: PrePostDevType = NegativeInfinity

else:
        _post = post

# Versions without a development segment should sort after those with one.
    if dev is None:
        _dev: PrePostDevType = Infinity

else:
        _dev = dev

if local is None:
        # 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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