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- import functools
- import logging
- import re
- from typing import NewType, Optional, Tuple, cast
- from pip._vendor.packaging import specifiers, version
- from pip._vendor.packaging.requirements import Requirement
- NormalizedExtra = NewType("NormalizedExtra", str)
- logger = logging.getLogger(__name__)
- def check_requires_python(
- requires_python: Optional[str], version_info: Tuple[int, ...]
- ) -> bool:
- """
- Check if the given Python version matches a "Requires-Python" specifier.
- :param version_info: A 3-tuple of ints representing a Python
- major-minor-micro version to check (e.g. `sys.version_info[:3]`).
- :return: `True` if the given Python version satisfies the requirement.
- Otherwise, return `False`.
- :raises InvalidSpecifier: If `requires_python` has an invalid format.
- """
- if requires_python is None:
- # The package provides no information
- return True
- requires_python_specifier = specifiers.SpecifierSet(requires_python)
- python_version = version.parse(".".join(map(str, version_info)))
- return python_version in requires_python_specifier
- @functools.lru_cache(maxsize=512)
- def get_requirement(req_string: str) -> Requirement:
- """Construct a packaging.Requirement object with caching"""
- # Parsing requirement strings is expensive, and is also expected to happen
- # with a low diversity of different arguments (at least relative the number
- # constructed). This method adds a cache to requirement object creation to
- # minimize repeated parsing of the same string to construct equivalent
- # Requirement objects.
- return Requirement(req_string)
- def safe_extra(extra: str) -> NormalizedExtra:
- """Convert an arbitrary string to a standard 'extra' name
- Any runs of non-alphanumeric characters are replaced with a single '_',
- and the result is always lowercased.
- This function is duplicated from ``pkg_resources``. Note that this is not
- the same to either ``canonicalize_name`` or ``_egg_link_name``.
- """
- return cast(NormalizedExtra, re.sub("[^A-Za-z0-9.-]+", "_", extra).lower())
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