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import importlib.util import sys 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, vendored_names=(), vendor_pkg=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): """ Iterate over the search path to locate and load fullname. """ root, base, target = fullname.partition(self.root_name + '.') for prefix in self.search_path: try: extant = prefix + target __import__(extant) mod = sys.modules[extant] sys.modules[fullname] = mod return mod except ImportError: pass 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): return self.load_module(spec.name) def exec_module(self, module): pass def find_spec(self, fullname, path=None, target=None): """Return a module spec for vendored names.""" return ( importlib.util.spec_from_loader(fullname, self) 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) names = ( 'packaging', 'platformdirs', 'jaraco', 'importlib_resources', 'more_itertools', ) VendorImporter(__name__, names).install()