59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
from typing import Iterable
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import distlib.markers
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import pkg_resources
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from distlib.markers import DEFAULT_CONTEXT
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from packaging.version import parse, _Version
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from pkg_resources._vendor.packaging.specifiers import SpecifierSet
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from mach_nix.versions import PyVer
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def context(py_ver: PyVer):
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context = DEFAULT_CONTEXT.copy()
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context.update(dict(
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platform_version='', # remove highly impure platform_version
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python_version=py_ver.python_version(),
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python_fulle_version=py_ver.python_full_version()
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))
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return context
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class Requirement(pkg_resources.Requirement):
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def __init__(self, line):
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super(Requirement, self).__init__(line)
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self.name = self.name.lower().replace('_', '-')
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self.specs = list(self.norm_specs(self.specs))
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self.specifier = SpecifierSet(','.join(f"{op}{ver}" for op, ver in self.specs))
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@staticmethod
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def norm_specs(specs):
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# PEP 440: Compatible Release
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for spec in specs:
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if spec[0] == "~=":
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ver = spec[1]
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yield ('>=', ver)
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ver = parse(parse(ver).base_version)
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ver_as_dict = ver._version._asdict()
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ver_as_dict['release'] = ver_as_dict['release'][:-1] + ('*',)
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ver._version = _Version(**ver_as_dict)
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yield ('==', str(ver))
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else:
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yield spec
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def strip_reqs_by_marker(reqs: Iterable[Requirement], context: dict):
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# filter requirements relevant for current environment
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for req in reqs:
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if req.marker:
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if distlib.markers.interpret(req.marker, context):
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yield req
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else:
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yield req
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def parse_reqs(strs):
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reqs = list(pkg_resources.parse_requirements(strs))
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for req in reqs:
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r = Requirement(str(req))
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yield r
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