775 lines
27 KiB
Python
775 lines
27 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 absolute_import, division, print_function
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import abc
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import functools
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import itertools
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import re
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from ._compat import string_types, with_metaclass
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from .version import Version, LegacyVersion, parse
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class InvalidSpecifier(ValueError):
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"""
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An invalid specifier was found, users should refer to PEP 440.
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"""
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class BaseSpecifier(with_metaclass(abc.ABCMeta, object)):
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@abc.abstractmethod
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def __str__(self):
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"""
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Returns the str representation of this Specifier like object. This
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should be representative of the Specifier itself.
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"""
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@abc.abstractmethod
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def __hash__(self):
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"""
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Returns a hash value for this Specifier like object.
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"""
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@abc.abstractmethod
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def __eq__(self, other):
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"""
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Returns a boolean representing whether or not the two Specifier like
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objects are equal.
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"""
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@abc.abstractmethod
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def __ne__(self, other):
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"""
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Returns a boolean representing whether or not the two Specifier like
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objects are not equal.
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"""
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@abc.abstractproperty
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def prereleases(self):
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"""
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Returns whether or not pre-releases as a whole are allowed by this
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specifier.
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"""
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@prereleases.setter
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def prereleases(self, value):
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"""
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Sets whether or not pre-releases as a whole are allowed by this
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specifier.
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"""
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@abc.abstractmethod
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def contains(self, item, prereleases=None):
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"""
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Determines if the given item is contained within this specifier.
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"""
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@abc.abstractmethod
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def filter(self, iterable, prereleases=None):
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"""
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Takes an iterable of items and filters them so that only items which
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are contained within this specifier are allowed in it.
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"""
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class _IndividualSpecifier(BaseSpecifier):
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_operators = {}
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def __init__(self, spec="", prereleases=None):
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match = self._regex.search(spec)
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if not match:
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raise InvalidSpecifier("Invalid specifier: '{0}'".format(spec))
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self._spec = (
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match.group("operator").strip(),
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match.group("version").strip(),
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)
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# Store whether or not this Specifier should accept prereleases
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self._prereleases = prereleases
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def __repr__(self):
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pre = (
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", prereleases={0!r}".format(self.prereleases)
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if self._prereleases is not None
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else ""
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)
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return "<{0}({1!r}{2})>".format(
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self.__class__.__name__,
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str(self),
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pre,
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)
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def __str__(self):
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return "{0}{1}".format(*self._spec)
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def __hash__(self):
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return hash(self._spec)
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def __eq__(self, other):
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if isinstance(other, string_types):
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try:
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other = self.__class__(other)
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except InvalidSpecifier:
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return NotImplemented
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elif not isinstance(other, self.__class__):
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return NotImplemented
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return self._spec == other._spec
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def __ne__(self, other):
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if isinstance(other, string_types):
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try:
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other = self.__class__(other)
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except InvalidSpecifier:
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return NotImplemented
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elif not isinstance(other, self.__class__):
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return NotImplemented
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return self._spec != other._spec
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def _get_operator(self, op):
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return getattr(self, "_compare_{0}".format(self._operators[op]))
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def _coerce_version(self, version):
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if not isinstance(version, (LegacyVersion, Version)):
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version = parse(version)
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return version
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@property
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def operator(self):
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return self._spec[0]
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@property
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def version(self):
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return self._spec[1]
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@property
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def prereleases(self):
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return self._prereleases
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@prereleases.setter
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def prereleases(self, value):
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self._prereleases = value
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def __contains__(self, item):
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return self.contains(item)
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def contains(self, item, prereleases=None):
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# Determine if prereleases are to be allowed or not.
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if prereleases is None:
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prereleases = self.prereleases
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# Normalize item to a Version or LegacyVersion, this allows us to have
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# a shortcut for ``"2.0" in Specifier(">=2")
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item = self._coerce_version(item)
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# Determine if we should be supporting prereleases in this specifier
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# or not, if we do not support prereleases than we can short circuit
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# logic if this version is a prereleases.
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if item.is_prerelease and not prereleases:
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return False
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# Actually do the comparison to determine if this item is contained
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# within this Specifier or not.
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return self._get_operator(self.operator)(item, self.version)
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def filter(self, iterable, prereleases=None):
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yielded = False
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found_prereleases = []
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kw = {"prereleases": prereleases if prereleases is not None else True}
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# Attempt to iterate over all the values in the iterable and if any of
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# them match, yield them.
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for version in iterable:
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parsed_version = self._coerce_version(version)
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if self.contains(parsed_version, **kw):
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# If our version is a prerelease, and we were not set to allow
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# prereleases, then we'll store it for later incase nothing
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# else matches this specifier.
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if (parsed_version.is_prerelease and not
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(prereleases or self.prereleases)):
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found_prereleases.append(version)
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# Either this is not a prerelease, or we should have been
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# accepting prereleases from the begining.
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else:
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yielded = True
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yield version
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# Now that we've iterated over everything, determine if we've yielded
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# any values, and if we have not and we have any prereleases stored up
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# then we will go ahead and yield the prereleases.
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if not yielded and found_prereleases:
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for version in found_prereleases:
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yield version
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class LegacySpecifier(_IndividualSpecifier):
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_regex_str = (
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r"""
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(?P<operator>(==|!=|<=|>=|<|>))
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\s*
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(?P<version>
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[^,;\s)]* # Since this is a "legacy" specifier, and the version
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# string can be just about anything, we match everything
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# except for whitespace, a semi-colon for marker support,
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# a closing paren since versions can be enclosed in
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# them, and a comma since it's a version separator.
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)
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"""
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)
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_regex = re.compile(
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r"^\s*" + _regex_str + r"\s*$", re.VERBOSE | re.IGNORECASE)
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_operators = {
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"==": "equal",
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"!=": "not_equal",
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"<=": "less_than_equal",
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">=": "greater_than_equal",
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"<": "less_than",
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">": "greater_than",
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}
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def _coerce_version(self, version):
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if not isinstance(version, LegacyVersion):
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version = LegacyVersion(str(version))
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return version
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def _compare_equal(self, prospective, spec):
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return prospective == self._coerce_version(spec)
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def _compare_not_equal(self, prospective, spec):
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return prospective != self._coerce_version(spec)
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def _compare_less_than_equal(self, prospective, spec):
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return prospective <= self._coerce_version(spec)
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def _compare_greater_than_equal(self, prospective, spec):
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return prospective >= self._coerce_version(spec)
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def _compare_less_than(self, prospective, spec):
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return prospective < self._coerce_version(spec)
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def _compare_greater_than(self, prospective, spec):
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return prospective > self._coerce_version(spec)
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def _require_version_compare(fn):
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@functools.wraps(fn)
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def wrapped(self, prospective, spec):
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if not isinstance(prospective, Version):
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return False
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return fn(self, prospective, spec)
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return wrapped
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class Specifier(_IndividualSpecifier):
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_regex_str = (
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r"""
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(?P<operator>(~=|==|!=|<=|>=|<|>|===))
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(?P<version>
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(?:
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# The identity operators allow for an escape hatch that will
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# do an exact string match of the version you wish to install.
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# This will not be parsed by PEP 440 and we cannot determine
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# any semantic meaning from it. This operator is discouraged
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# but included entirely as an escape hatch.
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(?<====) # Only match for the identity operator
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\s*
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[^\s]* # We just match everything, except for whitespace
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# since we are only testing for strict identity.
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)
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(?:
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# The (non)equality operators allow for wild card and local
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# versions to be specified so we have to define these two
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# operators separately to enable that.
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(?<===|!=) # Only match for equals and not equals
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\s*
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v?
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(?:[0-9]+!)? # epoch
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[0-9]+(?:\.[0-9]+)* # release
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(?: # pre release
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[-_\.]?
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(a|b|c|rc|alpha|beta|pre|preview)
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[-_\.]?
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[0-9]*
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)?
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(?: # post release
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(?:-[0-9]+)|(?:[-_\.]?(post|rev|r)[-_\.]?[0-9]*)
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)?
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# You cannot use a wild card and a dev or local version
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# together so group them with a | and make them optional.
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(?:
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(?:[-_\.]?dev[-_\.]?[0-9]*)? # dev release
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(?:\+[a-z0-9]+(?:[-_\.][a-z0-9]+)*)? # local
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\.\* # Wild card syntax of .*
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)?
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)
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(?:
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# The compatible operator requires at least two digits in the
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# release segment.
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(?<=~=) # Only match for the compatible operator
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\s*
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v?
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(?:[0-9]+!)? # epoch
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[0-9]+(?:\.[0-9]+)+ # release (We have a + instead of a *)
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(?: # pre release
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[-_\.]?
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(a|b|c|rc|alpha|beta|pre|preview)
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[-_\.]?
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[0-9]*
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)?
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(?: # post release
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(?:-[0-9]+)|(?:[-_\.]?(post|rev|r)[-_\.]?[0-9]*)
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)?
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(?:[-_\.]?dev[-_\.]?[0-9]*)? # dev release
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)
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(?:
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# All other operators only allow a sub set of what the
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# (non)equality operators do. Specifically they do not allow
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# local versions to be specified nor do they allow the prefix
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# matching wild cards.
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(?<!==|!=|~=) # We have special cases for these
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# operators so we want to make sure they
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# don't match here.
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\s*
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v?
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(?:[0-9]+!)? # epoch
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[0-9]+(?:\.[0-9]+)* # release
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(?: # pre release
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[-_\.]?
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(a|b|c|rc|alpha|beta|pre|preview)
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[-_\.]?
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[0-9]*
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)?
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(?: # post release
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(?:-[0-9]+)|(?:[-_\.]?(post|rev|r)[-_\.]?[0-9]*)
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)?
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(?:[-_\.]?dev[-_\.]?[0-9]*)? # dev release
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)
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)
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"""
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)
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_regex = re.compile(
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r"^\s*" + _regex_str + r"\s*$", re.VERBOSE | re.IGNORECASE)
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_operators = {
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"~=": "compatible",
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"==": "equal",
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"!=": "not_equal",
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"<=": "less_than_equal",
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">=": "greater_than_equal",
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"<": "less_than",
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">": "greater_than",
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"===": "arbitrary",
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}
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@_require_version_compare
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def _compare_compatible(self, prospective, spec):
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# Compatible releases have an equivalent combination of >= and ==. That
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# is that ~=2.2 is equivalent to >=2.2,==2.*. This allows us to
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# implement this in terms of the other specifiers instead of
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# implementing it ourselves. The only thing we need to do is construct
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# the other specifiers.
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# We want everything but the last item in the version, but we want to
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# ignore post and dev releases and we want to treat the pre-release as
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# it's own separate segment.
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prefix = ".".join(
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list(
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itertools.takewhile(
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lambda x: (not x.startswith("post") and not
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x.startswith("dev")),
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_version_split(spec),
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)
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)[:-1]
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)
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# Add the prefix notation to the end of our string
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prefix += ".*"
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return (self._get_operator(">=")(prospective, spec) and
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self._get_operator("==")(prospective, prefix))
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@_require_version_compare
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def _compare_equal(self, prospective, spec):
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# We need special logic to handle prefix matching
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if spec.endswith(".*"):
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# In the case of prefix matching we want to ignore local segment.
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prospective = Version(prospective.public)
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# Split the spec out by dots, and pretend that there is an implicit
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# dot in between a release segment and a pre-release segment.
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spec = _version_split(spec[:-2]) # Remove the trailing .*
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# Split the prospective version out by dots, and pretend that there
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# is an implicit dot in between a release segment and a pre-release
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# segment.
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prospective = _version_split(str(prospective))
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# Shorten the prospective version to be the same length as the spec
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# so that we can determine if the specifier is a prefix of the
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# prospective version or not.
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prospective = prospective[:len(spec)]
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# Pad out our two sides with zeros so that they both equal the same
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# length.
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spec, prospective = _pad_version(spec, prospective)
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else:
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# Convert our spec string into a Version
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spec = Version(spec)
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# If the specifier does not have a local segment, then we want to
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# act as if the prospective version also does not have a local
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# segment.
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if not spec.local:
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prospective = Version(prospective.public)
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return prospective == spec
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@_require_version_compare
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def _compare_not_equal(self, prospective, spec):
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return not self._compare_equal(prospective, spec)
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@_require_version_compare
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def _compare_less_than_equal(self, prospective, spec):
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return prospective <= Version(spec)
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@_require_version_compare
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def _compare_greater_than_equal(self, prospective, spec):
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return prospective >= Version(spec)
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@_require_version_compare
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def _compare_less_than(self, prospective, spec):
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# Convert our spec to a Version instance, since we'll want to work with
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# it as a version.
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spec = Version(spec)
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# Check to see if the prospective version is less than the spec
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# version. If it's not we can short circuit and just return False now
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# instead of doing extra unneeded work.
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if not prospective < spec:
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return False
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# This special case is here so that, unless the specifier itself
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# includes is a pre-release version, that we do not accept pre-release
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# versions for the version mentioned in the specifier (e.g. <3.1 should
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# not match 3.1.dev0, but should match 3.0.dev0).
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if not spec.is_prerelease and prospective.is_prerelease:
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if Version(prospective.base_version) == Version(spec.base_version):
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return False
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# If we've gotten to here, it means that prospective version is both
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# less than the spec version *and* it's not a pre-release of the same
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# version in the spec.
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return True
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@_require_version_compare
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def _compare_greater_than(self, prospective, spec):
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# Convert our spec to a Version instance, since we'll want to work with
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# it as a version.
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spec = Version(spec)
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# Check to see if the prospective version is greater than the spec
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# version. If it's not we can short circuit and just return False now
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# instead of doing extra unneeded work.
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if not prospective > spec:
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return False
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# This special case is here so that, unless the specifier itself
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# includes is a post-release version, that we do not accept
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# post-release versions for the version mentioned in the specifier
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# (e.g. >3.1 should not match 3.0.post0, but should match 3.2.post0).
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if not spec.is_postrelease and prospective.is_postrelease:
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if Version(prospective.base_version) == Version(spec.base_version):
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return False
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# Ensure that we do not allow a local version of the version mentioned
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# in the specifier, which is techincally greater than, to match.
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if prospective.local is not None:
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if Version(prospective.base_version) == Version(spec.base_version):
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return False
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# If we've gotten to here, it means that prospective version is both
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# greater than the spec version *and* it's not a pre-release of the
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# same version in the spec.
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return True
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def _compare_arbitrary(self, prospective, spec):
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return str(prospective).lower() == str(spec).lower()
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@property
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def prereleases(self):
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# If there is an explicit prereleases set for this, then we'll just
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# blindly use that.
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if self._prereleases is not None:
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return self._prereleases
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# Look at all of our specifiers and determine if they are inclusive
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# operators, and if they are if they are including an explicit
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# prerelease.
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operator, version = self._spec
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if operator in ["==", ">=", "<=", "~=", "==="]:
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# The == specifier can include a trailing .*, if it does we
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# want to remove before parsing.
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if operator == "==" and version.endswith(".*"):
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version = version[:-2]
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# Parse the version, and if it is a pre-release than this
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# specifier allows pre-releases.
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if parse(version).is_prerelease:
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return True
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return False
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@prereleases.setter
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def prereleases(self, value):
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self._prereleases = value
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|
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_prefix_regex = re.compile(r"^([0-9]+)((?:a|b|c|rc)[0-9]+)$")
|
|
|
|
|
|
def _version_split(version):
|
|
result = []
|
|
for item in version.split("."):
|
|
match = _prefix_regex.search(item)
|
|
if match:
|
|
result.extend(match.groups())
|
|
else:
|
|
result.append(item)
|
|
return result
|
|
|
|
|
|
def _pad_version(left, right):
|
|
left_split, right_split = [], []
|
|
|
|
# Get the release segment of our versions
|
|
left_split.append(list(itertools.takewhile(lambda x: x.isdigit(), left)))
|
|
right_split.append(list(itertools.takewhile(lambda x: x.isdigit(), right)))
|
|
|
|
# Get the rest of our versions
|
|
left_split.append(left[len(left_split[0]):])
|
|
right_split.append(right[len(right_split[0]):])
|
|
|
|
# Insert our padding
|
|
left_split.insert(
|
|
1,
|
|
["0"] * max(0, len(right_split[0]) - len(left_split[0])),
|
|
)
|
|
right_split.insert(
|
|
1,
|
|
["0"] * max(0, len(left_split[0]) - len(right_split[0])),
|
|
)
|
|
|
|
return (
|
|
list(itertools.chain(*left_split)),
|
|
list(itertools.chain(*right_split)),
|
|
)
|
|
|
|
|
|
class SpecifierSet(BaseSpecifier):
|
|
|
|
def __init__(self, specifiers="", prereleases=None):
|
|
# Split on , to break each indidivual specifier into it's own item, and
|
|
# strip each item to remove leading/trailing whitespace.
|
|
specifiers = [s.strip() for s in specifiers.split(",") if s.strip()]
|
|
|
|
# Parsed each individual specifier, attempting first to make it a
|
|
# Specifier and falling back to a LegacySpecifier.
|
|
parsed = set()
|
|
for specifier in specifiers:
|
|
try:
|
|
parsed.add(Specifier(specifier))
|
|
except InvalidSpecifier:
|
|
parsed.add(LegacySpecifier(specifier))
|
|
|
|
# Turn our parsed specifiers into a frozen set and save them for later.
|
|
self._specs = frozenset(parsed)
|
|
|
|
# Store our prereleases value so we can use it later to determine if
|
|
# we accept prereleases or not.
|
|
self._prereleases = prereleases
|
|
|
|
def __repr__(self):
|
|
pre = (
|
|
", prereleases={0!r}".format(self.prereleases)
|
|
if self._prereleases is not None
|
|
else ""
|
|
)
|
|
|
|
return "<SpecifierSet({0!r}{1})>".format(str(self), pre)
|
|
|
|
def __str__(self):
|
|
return ",".join(sorted(str(s) for s in self._specs))
|
|
|
|
def __hash__(self):
|
|
return hash(self._specs)
|
|
|
|
def __and__(self, other):
|
|
if isinstance(other, string_types):
|
|
other = SpecifierSet(other)
|
|
elif not isinstance(other, SpecifierSet):
|
|
return NotImplemented
|
|
|
|
specifier = SpecifierSet()
|
|
specifier._specs = frozenset(self._specs | other._specs)
|
|
|
|
if self._prereleases is None and other._prereleases is not None:
|
|
specifier._prereleases = other._prereleases
|
|
elif self._prereleases is not None and other._prereleases is None:
|
|
specifier._prereleases = self._prereleases
|
|
elif self._prereleases == other._prereleases:
|
|
specifier._prereleases = self._prereleases
|
|
else:
|
|
raise ValueError(
|
|
"Cannot combine SpecifierSets with True and False prerelease "
|
|
"overrides."
|
|
)
|
|
|
|
return specifier
|
|
|
|
def __eq__(self, other):
|
|
if isinstance(other, string_types):
|
|
other = SpecifierSet(other)
|
|
elif isinstance(other, _IndividualSpecifier):
|
|
other = SpecifierSet(str(other))
|
|
elif not isinstance(other, SpecifierSet):
|
|
return NotImplemented
|
|
|
|
return self._specs == other._specs
|
|
|
|
def __ne__(self, other):
|
|
if isinstance(other, string_types):
|
|
other = SpecifierSet(other)
|
|
elif isinstance(other, _IndividualSpecifier):
|
|
other = SpecifierSet(str(other))
|
|
elif not isinstance(other, SpecifierSet):
|
|
return NotImplemented
|
|
|
|
return self._specs != other._specs
|
|
|
|
def __len__(self):
|
|
return len(self._specs)
|
|
|
|
def __iter__(self):
|
|
return iter(self._specs)
|
|
|
|
@property
|
|
def prereleases(self):
|
|
# If we have been given an explicit prerelease modifier, then we'll
|
|
# pass that through here.
|
|
if self._prereleases is not None:
|
|
return self._prereleases
|
|
|
|
# If we don't have any specifiers, and we don't have a forced value,
|
|
# then we'll just return None since we don't know if this should have
|
|
# pre-releases or not.
|
|
if not self._specs:
|
|
return None
|
|
|
|
# Otherwise we'll see if any of the given specifiers accept
|
|
# prereleases, if any of them do we'll return True, otherwise False.
|
|
return any(s.prereleases for s in self._specs)
|
|
|
|
@prereleases.setter
|
|
def prereleases(self, value):
|
|
self._prereleases = value
|
|
|
|
def __contains__(self, item):
|
|
return self.contains(item)
|
|
|
|
def contains(self, item, prereleases=None):
|
|
# Ensure that our item is a Version or LegacyVersion instance.
|
|
if not isinstance(item, (LegacyVersion, Version)):
|
|
item = parse(item)
|
|
|
|
# Determine if we're forcing a prerelease or not, if we're not forcing
|
|
# one for this particular filter call, then we'll use whatever the
|
|
# SpecifierSet thinks for whether or not we should support prereleases.
|
|
if prereleases is None:
|
|
prereleases = self.prereleases
|
|
|
|
# We can determine if we're going to allow pre-releases by looking to
|
|
# see if any of the underlying items supports them. If none of them do
|
|
# and this item is a pre-release then we do not allow it and we can
|
|
# short circuit that here.
|
|
# Note: This means that 1.0.dev1 would not be contained in something
|
|
# like >=1.0.devabc however it would be in >=1.0.debabc,>0.0.dev0
|
|
if not prereleases and item.is_prerelease:
|
|
return False
|
|
|
|
# We simply dispatch to the underlying specs here to make sure that the
|
|
# given version is contained within all of them.
|
|
# Note: This use of all() here means that an empty set of specifiers
|
|
# will always return True, this is an explicit design decision.
|
|
return all(
|
|
s.contains(item, prereleases=prereleases)
|
|
for s in self._specs
|
|
)
|
|
|
|
def filter(self, iterable, prereleases=None):
|
|
# Determine if we're forcing a prerelease or not, if we're not forcing
|
|
# one for this particular filter call, then we'll use whatever the
|
|
# SpecifierSet thinks for whether or not we should support prereleases.
|
|
if prereleases is None:
|
|
prereleases = self.prereleases
|
|
|
|
# If we have any specifiers, then we want to wrap our iterable in the
|
|
# filter method for each one, this will act as a logical AND amongst
|
|
# each specifier.
|
|
if self._specs:
|
|
for spec in self._specs:
|
|
iterable = spec.filter(iterable, prereleases=bool(prereleases))
|
|
return iterable
|
|
# If we do not have any specifiers, then we need to have a rough filter
|
|
# which will filter out any pre-releases, unless there are no final
|
|
# releases, and which will filter out LegacyVersion in general.
|
|
else:
|
|
filtered = []
|
|
found_prereleases = []
|
|
|
|
for item in iterable:
|
|
# Ensure that we some kind of Version class for this item.
|
|
if not isinstance(item, (LegacyVersion, Version)):
|
|
parsed_version = parse(item)
|
|
else:
|
|
parsed_version = item
|
|
|
|
# Filter out any item which is parsed as a LegacyVersion
|
|
if isinstance(parsed_version, LegacyVersion):
|
|
continue
|
|
|
|
# Store any item which is a pre-release for later unless we've
|
|
# already found a final version or we are accepting prereleases
|
|
if parsed_version.is_prerelease and not prereleases:
|
|
if not filtered:
|
|
found_prereleases.append(item)
|
|
else:
|
|
filtered.append(item)
|
|
|
|
# If we've found no items except for pre-releases, then we'll go
|
|
# ahead and use the pre-releases
|
|
if not filtered and found_prereleases and prereleases is None:
|
|
return found_prereleases
|
|
|
|
return filtered
|