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