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43 lines
1.3 KiB
Python
43 lines
1.3 KiB
Python
from __future__ import annotations
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from collections.abc import Iterable, Iterator
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from functools import lru_cache
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from typing import TYPE_CHECKING, Callable, TypeVar, Union, overload
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import jaraco.text as text
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from packaging.requirements import Requirement
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if TYPE_CHECKING:
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from typing_extensions import TypeAlias
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_T = TypeVar("_T")
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_StrOrIter: TypeAlias = Union[str, Iterable[str]]
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parse_req: Callable[[str], Requirement] = lru_cache()(Requirement)
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# Setuptools parses the same requirement many times
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# (e.g. first for validation than for normalisation),
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# so it might be worth to cache.
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def parse_strings(strs: _StrOrIter) -> Iterator[str]:
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"""
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Yield requirement strings for each specification in `strs`.
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`strs` must be a string, or a (possibly-nested) iterable thereof.
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"""
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return text.join_continuation(map(text.drop_comment, text.yield_lines(strs)))
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# These overloads are only needed because of a mypy false-positive, pyright gets it right
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# https://github.com/python/mypy/issues/3737
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@overload
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def parse(strs: _StrOrIter) -> Iterator[Requirement]: ...
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@overload
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def parse(strs: _StrOrIter, parser: Callable[[str], _T]) -> Iterator[_T]: ...
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def parse(strs: _StrOrIter, parser: Callable[[str], _T] = parse_req) -> Iterator[_T]: # type: ignore[assignment]
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"""
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Parse requirements.
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"""
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return map(parser, parse_strings(strs))
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