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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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