Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/pip/_vendor/packaging/specifiers.py: 39%
302 statements
« prev ^ index » next coverage.py v7.4.3, created at 2024-02-26 06:33 +0000
1# This file is dual licensed under the terms of the Apache License, Version
2# 2.0, and the BSD License. See the LICENSE file in the root of this repository
3# for complete details.
5import abc
6import functools
7import itertools
8import re
9import warnings
10from typing import (
11 Callable,
12 Dict,
13 Iterable,
14 Iterator,
15 List,
16 Optional,
17 Pattern,
18 Set,
19 Tuple,
20 TypeVar,
21 Union,
22)
24from .utils import canonicalize_version
25from .version import LegacyVersion, Version, parse
27ParsedVersion = Union[Version, LegacyVersion]
28UnparsedVersion = Union[Version, LegacyVersion, str]
29VersionTypeVar = TypeVar("VersionTypeVar", bound=UnparsedVersion)
30CallableOperator = Callable[[ParsedVersion, str], bool]
33class InvalidSpecifier(ValueError):
34 """
35 An invalid specifier was found, users should refer to PEP 440.
36 """
39class BaseSpecifier(metaclass=abc.ABCMeta):
40 @abc.abstractmethod
41 def __str__(self) -> str:
42 """
43 Returns the str representation of this Specifier like object. This
44 should be representative of the Specifier itself.
45 """
47 @abc.abstractmethod
48 def __hash__(self) -> int:
49 """
50 Returns a hash value for this Specifier like object.
51 """
53 @abc.abstractmethod
54 def __eq__(self, other: object) -> bool:
55 """
56 Returns a boolean representing whether or not the two Specifier like
57 objects are equal.
58 """
60 @abc.abstractproperty
61 def prereleases(self) -> Optional[bool]:
62 """
63 Returns whether or not pre-releases as a whole are allowed by this
64 specifier.
65 """
67 @prereleases.setter
68 def prereleases(self, value: bool) -> None:
69 """
70 Sets whether or not pre-releases as a whole are allowed by this
71 specifier.
72 """
74 @abc.abstractmethod
75 def contains(self, item: str, prereleases: Optional[bool] = None) -> bool:
76 """
77 Determines if the given item is contained within this specifier.
78 """
80 @abc.abstractmethod
81 def filter(
82 self, iterable: Iterable[VersionTypeVar], prereleases: Optional[bool] = None
83 ) -> Iterable[VersionTypeVar]:
84 """
85 Takes an iterable of items and filters them so that only items which
86 are contained within this specifier are allowed in it.
87 """
90class _IndividualSpecifier(BaseSpecifier):
92 _operators: Dict[str, str] = {}
93 _regex: Pattern[str]
95 def __init__(self, spec: str = "", prereleases: Optional[bool] = None) -> None:
96 match = self._regex.search(spec)
97 if not match:
98 raise InvalidSpecifier(f"Invalid specifier: '{spec}'")
100 self._spec: Tuple[str, str] = (
101 match.group("operator").strip(),
102 match.group("version").strip(),
103 )
105 # Store whether or not this Specifier should accept prereleases
106 self._prereleases = prereleases
108 def __repr__(self) -> str:
109 pre = (
110 f", prereleases={self.prereleases!r}"
111 if self._prereleases is not None
112 else ""
113 )
115 return f"<{self.__class__.__name__}({str(self)!r}{pre})>"
117 def __str__(self) -> str:
118 return "{}{}".format(*self._spec)
120 @property
121 def _canonical_spec(self) -> Tuple[str, str]:
122 return self._spec[0], canonicalize_version(self._spec[1])
124 def __hash__(self) -> int:
125 return hash(self._canonical_spec)
127 def __eq__(self, other: object) -> bool:
128 if isinstance(other, str):
129 try:
130 other = self.__class__(str(other))
131 except InvalidSpecifier:
132 return NotImplemented
133 elif not isinstance(other, self.__class__):
134 return NotImplemented
136 return self._canonical_spec == other._canonical_spec
138 def _get_operator(self, op: str) -> CallableOperator:
139 operator_callable: CallableOperator = getattr(
140 self, f"_compare_{self._operators[op]}"
141 )
142 return operator_callable
144 def _coerce_version(self, version: UnparsedVersion) -> ParsedVersion:
145 if not isinstance(version, (LegacyVersion, Version)):
146 version = parse(version)
147 return version
149 @property
150 def operator(self) -> str:
151 return self._spec[0]
153 @property
154 def version(self) -> str:
155 return self._spec[1]
157 @property
158 def prereleases(self) -> Optional[bool]:
159 return self._prereleases
161 @prereleases.setter
162 def prereleases(self, value: bool) -> None:
163 self._prereleases = value
165 def __contains__(self, item: str) -> bool:
166 return self.contains(item)
168 def contains(
169 self, item: UnparsedVersion, prereleases: Optional[bool] = None
170 ) -> bool:
172 # Determine if prereleases are to be allowed or not.
173 if prereleases is None:
174 prereleases = self.prereleases
176 # Normalize item to a Version or LegacyVersion, this allows us to have
177 # a shortcut for ``"2.0" in Specifier(">=2")
178 normalized_item = self._coerce_version(item)
180 # Determine if we should be supporting prereleases in this specifier
181 # or not, if we do not support prereleases than we can short circuit
182 # logic if this version is a prereleases.
183 if normalized_item.is_prerelease and not prereleases:
184 return False
186 # Actually do the comparison to determine if this item is contained
187 # within this Specifier or not.
188 operator_callable: CallableOperator = self._get_operator(self.operator)
189 return operator_callable(normalized_item, self.version)
191 def filter(
192 self, iterable: Iterable[VersionTypeVar], prereleases: Optional[bool] = None
193 ) -> Iterable[VersionTypeVar]:
195 yielded = False
196 found_prereleases = []
198 kw = {"prereleases": prereleases if prereleases is not None else True}
200 # Attempt to iterate over all the values in the iterable and if any of
201 # them match, yield them.
202 for version in iterable:
203 parsed_version = self._coerce_version(version)
205 if self.contains(parsed_version, **kw):
206 # If our version is a prerelease, and we were not set to allow
207 # prereleases, then we'll store it for later in case nothing
208 # else matches this specifier.
209 if parsed_version.is_prerelease and not (
210 prereleases or self.prereleases
211 ):
212 found_prereleases.append(version)
213 # Either this is not a prerelease, or we should have been
214 # accepting prereleases from the beginning.
215 else:
216 yielded = True
217 yield version
219 # Now that we've iterated over everything, determine if we've yielded
220 # any values, and if we have not and we have any prereleases stored up
221 # then we will go ahead and yield the prereleases.
222 if not yielded and found_prereleases:
223 for version in found_prereleases:
224 yield version
227class LegacySpecifier(_IndividualSpecifier):
229 _regex_str = r"""
230 (?P<operator>(==|!=|<=|>=|<|>))
231 \s*
232 (?P<version>
233 [^,;\s)]* # Since this is a "legacy" specifier, and the version
234 # string can be just about anything, we match everything
235 # except for whitespace, a semi-colon for marker support,
236 # a closing paren since versions can be enclosed in
237 # them, and a comma since it's a version separator.
238 )
239 """
241 _regex = re.compile(r"^\s*" + _regex_str + r"\s*$", re.VERBOSE | re.IGNORECASE)
243 _operators = {
244 "==": "equal",
245 "!=": "not_equal",
246 "<=": "less_than_equal",
247 ">=": "greater_than_equal",
248 "<": "less_than",
249 ">": "greater_than",
250 }
252 def __init__(self, spec: str = "", prereleases: Optional[bool] = None) -> None:
253 super().__init__(spec, prereleases)
255 warnings.warn(
256 "Creating a LegacyVersion has been deprecated and will be "
257 "removed in the next major release",
258 DeprecationWarning,
259 )
261 def _coerce_version(self, version: UnparsedVersion) -> LegacyVersion:
262 if not isinstance(version, LegacyVersion):
263 version = LegacyVersion(str(version))
264 return version
266 def _compare_equal(self, prospective: LegacyVersion, spec: str) -> bool:
267 return prospective == self._coerce_version(spec)
269 def _compare_not_equal(self, prospective: LegacyVersion, spec: str) -> bool:
270 return prospective != self._coerce_version(spec)
272 def _compare_less_than_equal(self, prospective: LegacyVersion, spec: str) -> bool:
273 return prospective <= self._coerce_version(spec)
275 def _compare_greater_than_equal(
276 self, prospective: LegacyVersion, spec: str
277 ) -> bool:
278 return prospective >= self._coerce_version(spec)
280 def _compare_less_than(self, prospective: LegacyVersion, spec: str) -> bool:
281 return prospective < self._coerce_version(spec)
283 def _compare_greater_than(self, prospective: LegacyVersion, spec: str) -> bool:
284 return prospective > self._coerce_version(spec)
287def _require_version_compare(
288 fn: Callable[["Specifier", ParsedVersion, str], bool]
289) -> Callable[["Specifier", ParsedVersion, str], bool]:
290 @functools.wraps(fn)
291 def wrapped(self: "Specifier", prospective: ParsedVersion, spec: str) -> bool:
292 if not isinstance(prospective, Version):
293 return False
294 return fn(self, prospective, spec)
296 return wrapped
299class Specifier(_IndividualSpecifier):
301 _regex_str = r"""
302 (?P<operator>(~=|==|!=|<=|>=|<|>|===))
303 (?P<version>
304 (?:
305 # The identity operators allow for an escape hatch that will
306 # do an exact string match of the version you wish to install.
307 # This will not be parsed by PEP 440 and we cannot determine
308 # any semantic meaning from it. This operator is discouraged
309 # but included entirely as an escape hatch.
310 (?<====) # Only match for the identity operator
311 \s*
312 [^\s]* # We just match everything, except for whitespace
313 # since we are only testing for strict identity.
314 )
315 |
316 (?:
317 # The (non)equality operators allow for wild card and local
318 # versions to be specified so we have to define these two
319 # operators separately to enable that.
320 (?<===|!=) # Only match for equals and not equals
322 \s*
323 v?
324 (?:[0-9]+!)? # epoch
325 [0-9]+(?:\.[0-9]+)* # release
326 (?: # pre release
327 [-_\.]?
328 (a|b|c|rc|alpha|beta|pre|preview)
329 [-_\.]?
330 [0-9]*
331 )?
332 (?: # post release
333 (?:-[0-9]+)|(?:[-_\.]?(post|rev|r)[-_\.]?[0-9]*)
334 )?
336 # You cannot use a wild card and a dev or local version
337 # together so group them with a | and make them optional.
338 (?:
339 (?:[-_\.]?dev[-_\.]?[0-9]*)? # dev release
340 (?:\+[a-z0-9]+(?:[-_\.][a-z0-9]+)*)? # local
341 |
342 \.\* # Wild card syntax of .*
343 )?
344 )
345 |
346 (?:
347 # The compatible operator requires at least two digits in the
348 # release segment.
349 (?<=~=) # Only match for the compatible operator
351 \s*
352 v?
353 (?:[0-9]+!)? # epoch
354 [0-9]+(?:\.[0-9]+)+ # release (We have a + instead of a *)
355 (?: # pre release
356 [-_\.]?
357 (a|b|c|rc|alpha|beta|pre|preview)
358 [-_\.]?
359 [0-9]*
360 )?
361 (?: # post release
362 (?:-[0-9]+)|(?:[-_\.]?(post|rev|r)[-_\.]?[0-9]*)
363 )?
364 (?:[-_\.]?dev[-_\.]?[0-9]*)? # dev release
365 )
366 |
367 (?:
368 # All other operators only allow a sub set of what the
369 # (non)equality operators do. Specifically they do not allow
370 # local versions to be specified nor do they allow the prefix
371 # matching wild cards.
372 (?<!==|!=|~=) # We have special cases for these
373 # operators so we want to make sure they
374 # don't match here.
376 \s*
377 v?
378 (?:[0-9]+!)? # epoch
379 [0-9]+(?:\.[0-9]+)* # release
380 (?: # pre release
381 [-_\.]?
382 (a|b|c|rc|alpha|beta|pre|preview)
383 [-_\.]?
384 [0-9]*
385 )?
386 (?: # post release
387 (?:-[0-9]+)|(?:[-_\.]?(post|rev|r)[-_\.]?[0-9]*)
388 )?
389 (?:[-_\.]?dev[-_\.]?[0-9]*)? # dev release
390 )
391 )
392 """
394 _regex = re.compile(r"^\s*" + _regex_str + r"\s*$", re.VERBOSE | re.IGNORECASE)
396 _operators = {
397 "~=": "compatible",
398 "==": "equal",
399 "!=": "not_equal",
400 "<=": "less_than_equal",
401 ">=": "greater_than_equal",
402 "<": "less_than",
403 ">": "greater_than",
404 "===": "arbitrary",
405 }
407 @_require_version_compare
408 def _compare_compatible(self, prospective: ParsedVersion, spec: str) -> bool:
410 # Compatible releases have an equivalent combination of >= and ==. That
411 # is that ~=2.2 is equivalent to >=2.2,==2.*. This allows us to
412 # implement this in terms of the other specifiers instead of
413 # implementing it ourselves. The only thing we need to do is construct
414 # the other specifiers.
416 # We want everything but the last item in the version, but we want to
417 # ignore suffix segments.
418 prefix = ".".join(
419 list(itertools.takewhile(_is_not_suffix, _version_split(spec)))[:-1]
420 )
422 # Add the prefix notation to the end of our string
423 prefix += ".*"
425 return self._get_operator(">=")(prospective, spec) and self._get_operator("==")(
426 prospective, prefix
427 )
429 @_require_version_compare
430 def _compare_equal(self, prospective: ParsedVersion, spec: str) -> bool:
432 # We need special logic to handle prefix matching
433 if spec.endswith(".*"):
434 # In the case of prefix matching we want to ignore local segment.
435 prospective = Version(prospective.public)
436 # Split the spec out by dots, and pretend that there is an implicit
437 # dot in between a release segment and a pre-release segment.
438 split_spec = _version_split(spec[:-2]) # Remove the trailing .*
440 # Split the prospective version out by dots, and pretend that there
441 # is an implicit dot in between a release segment and a pre-release
442 # segment.
443 split_prospective = _version_split(str(prospective))
445 # Shorten the prospective version to be the same length as the spec
446 # so that we can determine if the specifier is a prefix of the
447 # prospective version or not.
448 shortened_prospective = split_prospective[: len(split_spec)]
450 # Pad out our two sides with zeros so that they both equal the same
451 # length.
452 padded_spec, padded_prospective = _pad_version(
453 split_spec, shortened_prospective
454 )
456 return padded_prospective == padded_spec
457 else:
458 # Convert our spec string into a Version
459 spec_version = Version(spec)
461 # If the specifier does not have a local segment, then we want to
462 # act as if the prospective version also does not have a local
463 # segment.
464 if not spec_version.local:
465 prospective = Version(prospective.public)
467 return prospective == spec_version
469 @_require_version_compare
470 def _compare_not_equal(self, prospective: ParsedVersion, spec: str) -> bool:
471 return not self._compare_equal(prospective, spec)
473 @_require_version_compare
474 def _compare_less_than_equal(self, prospective: ParsedVersion, spec: str) -> bool:
476 # NB: Local version identifiers are NOT permitted in the version
477 # specifier, so local version labels can be universally removed from
478 # the prospective version.
479 return Version(prospective.public) <= Version(spec)
481 @_require_version_compare
482 def _compare_greater_than_equal(
483 self, prospective: ParsedVersion, spec: str
484 ) -> bool:
486 # NB: Local version identifiers are NOT permitted in the version
487 # specifier, so local version labels can be universally removed from
488 # the prospective version.
489 return Version(prospective.public) >= Version(spec)
491 @_require_version_compare
492 def _compare_less_than(self, prospective: ParsedVersion, spec_str: str) -> bool:
494 # Convert our spec to a Version instance, since we'll want to work with
495 # it as a version.
496 spec = Version(spec_str)
498 # Check to see if the prospective version is less than the spec
499 # version. If it's not we can short circuit and just return False now
500 # instead of doing extra unneeded work.
501 if not prospective < spec:
502 return False
504 # This special case is here so that, unless the specifier itself
505 # includes is a pre-release version, that we do not accept pre-release
506 # versions for the version mentioned in the specifier (e.g. <3.1 should
507 # not match 3.1.dev0, but should match 3.0.dev0).
508 if not spec.is_prerelease and prospective.is_prerelease:
509 if Version(prospective.base_version) == Version(spec.base_version):
510 return False
512 # If we've gotten to here, it means that prospective version is both
513 # less than the spec version *and* it's not a pre-release of the same
514 # version in the spec.
515 return True
517 @_require_version_compare
518 def _compare_greater_than(self, prospective: ParsedVersion, spec_str: str) -> bool:
520 # Convert our spec to a Version instance, since we'll want to work with
521 # it as a version.
522 spec = Version(spec_str)
524 # Check to see if the prospective version is greater than the spec
525 # version. If it's not we can short circuit and just return False now
526 # instead of doing extra unneeded work.
527 if not prospective > spec:
528 return False
530 # This special case is here so that, unless the specifier itself
531 # includes is a post-release version, that we do not accept
532 # post-release versions for the version mentioned in the specifier
533 # (e.g. >3.1 should not match 3.0.post0, but should match 3.2.post0).
534 if not spec.is_postrelease and prospective.is_postrelease:
535 if Version(prospective.base_version) == Version(spec.base_version):
536 return False
538 # Ensure that we do not allow a local version of the version mentioned
539 # in the specifier, which is technically greater than, to match.
540 if prospective.local is not None:
541 if Version(prospective.base_version) == Version(spec.base_version):
542 return False
544 # If we've gotten to here, it means that prospective version is both
545 # greater than the spec version *and* it's not a pre-release of the
546 # same version in the spec.
547 return True
549 def _compare_arbitrary(self, prospective: Version, spec: str) -> bool:
550 return str(prospective).lower() == str(spec).lower()
552 @property
553 def prereleases(self) -> bool:
555 # If there is an explicit prereleases set for this, then we'll just
556 # blindly use that.
557 if self._prereleases is not None:
558 return self._prereleases
560 # Look at all of our specifiers and determine if they are inclusive
561 # operators, and if they are if they are including an explicit
562 # prerelease.
563 operator, version = self._spec
564 if operator in ["==", ">=", "<=", "~=", "==="]:
565 # The == specifier can include a trailing .*, if it does we
566 # want to remove before parsing.
567 if operator == "==" and version.endswith(".*"):
568 version = version[:-2]
570 # Parse the version, and if it is a pre-release than this
571 # specifier allows pre-releases.
572 if parse(version).is_prerelease:
573 return True
575 return False
577 @prereleases.setter
578 def prereleases(self, value: bool) -> None:
579 self._prereleases = value
582_prefix_regex = re.compile(r"^([0-9]+)((?:a|b|c|rc)[0-9]+)$")
585def _version_split(version: str) -> List[str]:
586 result: List[str] = []
587 for item in version.split("."):
588 match = _prefix_regex.search(item)
589 if match:
590 result.extend(match.groups())
591 else:
592 result.append(item)
593 return result
596def _is_not_suffix(segment: str) -> bool:
597 return not any(
598 segment.startswith(prefix) for prefix in ("dev", "a", "b", "rc", "post")
599 )
602def _pad_version(left: List[str], right: List[str]) -> Tuple[List[str], List[str]]:
603 left_split, right_split = [], []
605 # Get the release segment of our versions
606 left_split.append(list(itertools.takewhile(lambda x: x.isdigit(), left)))
607 right_split.append(list(itertools.takewhile(lambda x: x.isdigit(), right)))
609 # Get the rest of our versions
610 left_split.append(left[len(left_split[0]) :])
611 right_split.append(right[len(right_split[0]) :])
613 # Insert our padding
614 left_split.insert(1, ["0"] * max(0, len(right_split[0]) - len(left_split[0])))
615 right_split.insert(1, ["0"] * max(0, len(left_split[0]) - len(right_split[0])))
617 return (list(itertools.chain(*left_split)), list(itertools.chain(*right_split)))
620class SpecifierSet(BaseSpecifier):
621 def __init__(
622 self, specifiers: str = "", prereleases: Optional[bool] = None
623 ) -> None:
625 # Split on , to break each individual specifier into it's own item, and
626 # strip each item to remove leading/trailing whitespace.
627 split_specifiers = [s.strip() for s in specifiers.split(",") if s.strip()]
629 # Parsed each individual specifier, attempting first to make it a
630 # Specifier and falling back to a LegacySpecifier.
631 parsed: Set[_IndividualSpecifier] = set()
632 for specifier in split_specifiers:
633 try:
634 parsed.add(Specifier(specifier))
635 except InvalidSpecifier:
636 parsed.add(LegacySpecifier(specifier))
638 # Turn our parsed specifiers into a frozen set and save them for later.
639 self._specs = frozenset(parsed)
641 # Store our prereleases value so we can use it later to determine if
642 # we accept prereleases or not.
643 self._prereleases = prereleases
645 def __repr__(self) -> str:
646 pre = (
647 f", prereleases={self.prereleases!r}"
648 if self._prereleases is not None
649 else ""
650 )
652 return f"<SpecifierSet({str(self)!r}{pre})>"
654 def __str__(self) -> str:
655 return ",".join(sorted(str(s) for s in self._specs))
657 def __hash__(self) -> int:
658 return hash(self._specs)
660 def __and__(self, other: Union["SpecifierSet", str]) -> "SpecifierSet":
661 if isinstance(other, str):
662 other = SpecifierSet(other)
663 elif not isinstance(other, SpecifierSet):
664 return NotImplemented
666 specifier = SpecifierSet()
667 specifier._specs = frozenset(self._specs | other._specs)
669 if self._prereleases is None and other._prereleases is not None:
670 specifier._prereleases = other._prereleases
671 elif self._prereleases is not None and other._prereleases is None:
672 specifier._prereleases = self._prereleases
673 elif self._prereleases == other._prereleases:
674 specifier._prereleases = self._prereleases
675 else:
676 raise ValueError(
677 "Cannot combine SpecifierSets with True and False prerelease "
678 "overrides."
679 )
681 return specifier
683 def __eq__(self, other: object) -> bool:
684 if isinstance(other, (str, _IndividualSpecifier)):
685 other = SpecifierSet(str(other))
686 elif not isinstance(other, SpecifierSet):
687 return NotImplemented
689 return self._specs == other._specs
691 def __len__(self) -> int:
692 return len(self._specs)
694 def __iter__(self) -> Iterator[_IndividualSpecifier]:
695 return iter(self._specs)
697 @property
698 def prereleases(self) -> Optional[bool]:
700 # If we have been given an explicit prerelease modifier, then we'll
701 # pass that through here.
702 if self._prereleases is not None:
703 return self._prereleases
705 # If we don't have any specifiers, and we don't have a forced value,
706 # then we'll just return None since we don't know if this should have
707 # pre-releases or not.
708 if not self._specs:
709 return None
711 # Otherwise we'll see if any of the given specifiers accept
712 # prereleases, if any of them do we'll return True, otherwise False.
713 return any(s.prereleases for s in self._specs)
715 @prereleases.setter
716 def prereleases(self, value: bool) -> None:
717 self._prereleases = value
719 def __contains__(self, item: UnparsedVersion) -> bool:
720 return self.contains(item)
722 def contains(
723 self, item: UnparsedVersion, prereleases: Optional[bool] = None
724 ) -> bool:
726 # Ensure that our item is a Version or LegacyVersion instance.
727 if not isinstance(item, (LegacyVersion, Version)):
728 item = parse(item)
730 # Determine if we're forcing a prerelease or not, if we're not forcing
731 # one for this particular filter call, then we'll use whatever the
732 # SpecifierSet thinks for whether or not we should support prereleases.
733 if prereleases is None:
734 prereleases = self.prereleases
736 # We can determine if we're going to allow pre-releases by looking to
737 # see if any of the underlying items supports them. If none of them do
738 # and this item is a pre-release then we do not allow it and we can
739 # short circuit that here.
740 # Note: This means that 1.0.dev1 would not be contained in something
741 # like >=1.0.devabc however it would be in >=1.0.debabc,>0.0.dev0
742 if not prereleases and item.is_prerelease:
743 return False
745 # We simply dispatch to the underlying specs here to make sure that the
746 # given version is contained within all of them.
747 # Note: This use of all() here means that an empty set of specifiers
748 # will always return True, this is an explicit design decision.
749 return all(s.contains(item, prereleases=prereleases) for s in self._specs)
751 def filter(
752 self, iterable: Iterable[VersionTypeVar], prereleases: Optional[bool] = None
753 ) -> Iterable[VersionTypeVar]:
755 # Determine if we're forcing a prerelease or not, if we're not forcing
756 # one for this particular filter call, then we'll use whatever the
757 # SpecifierSet thinks for whether or not we should support prereleases.
758 if prereleases is None:
759 prereleases = self.prereleases
761 # If we have any specifiers, then we want to wrap our iterable in the
762 # filter method for each one, this will act as a logical AND amongst
763 # each specifier.
764 if self._specs:
765 for spec in self._specs:
766 iterable = spec.filter(iterable, prereleases=bool(prereleases))
767 return iterable
768 # If we do not have any specifiers, then we need to have a rough filter
769 # which will filter out any pre-releases, unless there are no final
770 # releases, and which will filter out LegacyVersion in general.
771 else:
772 filtered: List[VersionTypeVar] = []
773 found_prereleases: List[VersionTypeVar] = []
775 item: UnparsedVersion
776 parsed_version: Union[Version, LegacyVersion]
778 for item in iterable:
779 # Ensure that we some kind of Version class for this item.
780 if not isinstance(item, (LegacyVersion, Version)):
781 parsed_version = parse(item)
782 else:
783 parsed_version = item
785 # Filter out any item which is parsed as a LegacyVersion
786 if isinstance(parsed_version, LegacyVersion):
787 continue
789 # Store any item which is a pre-release for later unless we've
790 # already found a final version or we are accepting prereleases
791 if parsed_version.is_prerelease and not prereleases:
792 if not filtered:
793 found_prereleases.append(item)
794 else:
795 filtered.append(item)
797 # If we've found no items except for pre-releases, then we'll go
798 # ahead and use the pre-releases
799 if not filtered and found_prereleases and prereleases is None:
800 return found_prereleases
802 return filtered