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root
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opt
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cloudlinux
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venv
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lib
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python3.11
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site-packages
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pkg_resources
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extern
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__init__.py
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from __future__ import annotations from importlib.machinery import ModuleSpec import importlib.util import sys from types import ModuleType from typing import Iterable, Sequence class VendorImporter: """ A PEP 302 meta path importer for finding optionally-vendored or otherwise naturally-installed packages from root_name. """ def __init__( self, root_name: str, vendored_names: Iterable[str] = (), vendor_pkg: str | None = None, ): self.root_name = root_name self.vendored_names = set(vendored_names) self.vendor_pkg = vendor_pkg or root_name.replace('extern', '_vendor') @property def search_path(self): """ Search first the vendor package then as a natural package. """ yield self.vendor_pkg + '.' yield '' def _module_matches_namespace(self, fullname): """Figure out if the target module is vendored.""" root, base, target = fullname.partition(self.root_name + '.') return not root and any(map(target.startswith, self.vendored_names)) def load_module(self, fullname: str): """ Iterate over the search path to locate and load fullname. """ root, base, target = fullname.partition(self.root_name + '.') for prefix in self.search_path: extant = prefix + target try: __import__(extant) except ImportError: continue mod = sys.modules[extant] sys.modules[fullname] = mod return mod else: raise ImportError( "The '{target}' package is required; " "normally this is bundled with this package so if you get " "this warning, consult the packager of your " "distribution.".format(**locals()) ) def create_module(self, spec: ModuleSpec): return self.load_module(spec.name) def exec_module(self, module: ModuleType): pass def find_spec( self, fullname: str, path: Sequence[str] | None = None, target: ModuleType | None = None, ): """Return a module spec for vendored names.""" return ( # This should fix itself next mypy release https://github.com/python/typeshed/pull/11890 importlib.util.spec_from_loader(fullname, self) # type: ignore[arg-type] if self._module_matches_namespace(fullname) else None ) def install(self): """ Install this importer into sys.meta_path if not already present. """ if self not in sys.meta_path: sys.meta_path.append(self) # [[[cog # import cog # from tools.vendored import yield_top_level # names = "\n".join(f" {x!r}," for x in yield_top_level('pkg_resources')) # cog.outl(f"names = (\n{names}\n)") # ]]] names = ( 'backports', 'importlib_resources', 'jaraco', 'more_itertools', 'packaging', 'platformdirs', 'zipp', ) # [[[end]]] VendorImporter(__name__, names).install()