forked from mrlan/EnglishPal
39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
from functools import lru_cache
|
|
from typing import Callable, Iterable, Iterator, TypeVar, Union, overload
|
|
|
|
import setuptools.extern.jaraco.text as text
|
|
from setuptools.extern.packaging.requirements import Requirement
|
|
|
|
_T = TypeVar("_T")
|
|
_StrOrIter = Union[str, Iterable[str]]
|
|
|
|
|
|
parse_req: Callable[[str], Requirement] = lru_cache()(Requirement)
|
|
# Setuptools parses the same requirement many times
|
|
# (e.g. first for validation than for normalisation),
|
|
# so it might be worth to cache.
|
|
|
|
|
|
def parse_strings(strs: _StrOrIter) -> Iterator[str]:
|
|
"""
|
|
Yield requirement strings for each specification in `strs`.
|
|
|
|
`strs` must be a string, or a (possibly-nested) iterable thereof.
|
|
"""
|
|
return text.join_continuation(map(text.drop_comment, text.yield_lines(strs)))
|
|
|
|
|
|
@overload
|
|
def parse(strs: _StrOrIter) -> Iterator[Requirement]: ...
|
|
|
|
|
|
@overload
|
|
def parse(strs: _StrOrIter, parser: Callable[[str], _T]) -> Iterator[_T]: ...
|
|
|
|
|
|
def parse(strs, parser=parse_req):
|
|
"""
|
|
Replacement for ``pkg_resources.parse_requirements`` that uses ``packaging``.
|
|
"""
|
|
return map(parser, parse_strings(strs))
|