forked from mrlan/EnglishPal
105 lines
3.1 KiB
Python
105 lines
3.1 KiB
Python
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from __future__ import annotations
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from importlib.machinery import ModuleSpec
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import importlib.util
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import sys
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from types import ModuleType
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from typing import Iterable, Sequence
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class VendorImporter:
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"""
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A PEP 302 meta path importer for finding optionally-vendored
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or otherwise naturally-installed packages from root_name.
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"""
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def __init__(
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self,
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root_name: str,
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vendored_names: Iterable[str] = (),
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vendor_pkg: str | None = None,
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):
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self.root_name = root_name
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self.vendored_names = set(vendored_names)
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self.vendor_pkg = vendor_pkg or root_name.replace('extern', '_vendor')
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@property
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def search_path(self):
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"""
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Search first the vendor package then as a natural package.
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"""
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yield self.vendor_pkg + '.'
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yield ''
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def _module_matches_namespace(self, fullname):
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"""Figure out if the target module is vendored."""
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root, base, target = fullname.partition(self.root_name + '.')
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return not root and any(map(target.startswith, self.vendored_names))
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def load_module(self, fullname: str):
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"""
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Iterate over the search path to locate and load fullname.
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"""
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root, base, target = fullname.partition(self.root_name + '.')
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for prefix in self.search_path:
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try:
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extant = prefix + target
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__import__(extant)
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mod = sys.modules[extant]
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sys.modules[fullname] = mod
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return mod
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except ImportError:
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pass
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else:
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raise ImportError(
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"The '{target}' package is required; "
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"normally this is bundled with this package so if you get "
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"this warning, consult the packager of your "
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"distribution.".format(**locals())
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)
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def create_module(self, spec: ModuleSpec):
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return self.load_module(spec.name)
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def exec_module(self, module: ModuleType):
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pass
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def find_spec(
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self,
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fullname: str,
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path: Sequence[str] | None = None,
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target: ModuleType | None = None,
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):
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"""Return a module spec for vendored names."""
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return (
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# This should fix itself next mypy release https://github.com/python/typeshed/pull/11890
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importlib.util.spec_from_loader(fullname, self) # type: ignore[arg-type]
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if self._module_matches_namespace(fullname)
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else None
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)
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def install(self):
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"""
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Install this importer into sys.meta_path if not already present.
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"""
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if self not in sys.meta_path:
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sys.meta_path.append(self)
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# [[[cog
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# import cog
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# from tools.vendored import yield_top_level
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# names = "\n".join(f" {x!r}," for x in yield_top_level('pkg_resources'))
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# cog.outl(f"names = (\n{names}\n)")
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# ]]]
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names = (
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'backports',
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'importlib_resources',
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'jaraco',
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'more_itertools',
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'packaging',
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'platformdirs',
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'zipp',
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)
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# [[[end]]]
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VendorImporter(__name__, names).install()
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