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proc
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self
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root
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opt
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hc_python
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lib64
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python3.8
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site-packages
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importlib_resources
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future
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Filename :
adapters.py
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import functools import pathlib from contextlib import suppress from types import SimpleNamespace from .. import readers, _adapters def _block_standard(reader_getter): """ Wrap _adapters.TraversableResourcesLoader.get_resource_reader and intercept any standard library readers. """ @functools.wraps(reader_getter) def wrapper(*args, **kwargs): """ If the reader is from the standard library, return None to allow allow likely newer implementations in this library to take precedence. """ try: reader = reader_getter(*args, **kwargs) except NotADirectoryError: # MultiplexedPath may fail on zip subdirectory return # Python 3.10+ mod_name = reader.__class__.__module__ if mod_name.startswith('importlib.') and mod_name.endswith('readers'): return # Python 3.8, 3.9 if isinstance(reader, _adapters.CompatibilityFiles) and ( reader.spec.loader.__class__.__module__.startswith('zipimport') or reader.spec.loader.__class__.__module__.startswith( '_frozen_importlib_external' ) ): return return reader return wrapper def _skip_degenerate(reader): """ Mask any degenerate reader. Ref #298. """ is_degenerate = ( isinstance(reader, _adapters.CompatibilityFiles) and not reader._reader ) return reader if not is_degenerate else None class TraversableResourcesLoader(_adapters.TraversableResourcesLoader): """ Adapt loaders to provide TraversableResources and other compatibility. Ensures the readers from importlib_resources are preferred over stdlib readers. """ def get_resource_reader(self, name): return ( _skip_degenerate(_block_standard(super().get_resource_reader)(name)) or self._standard_reader() or super().get_resource_reader(name) ) def _standard_reader(self): return self._zip_reader() or self._namespace_reader() or self._file_reader() def _zip_reader(self): with suppress(AttributeError): return readers.ZipReader(self.spec.loader, self.spec.name) def _namespace_reader(self): with suppress(AttributeError, ValueError): return readers.NamespaceReader(self.spec.submodule_search_locations) def _file_reader(self): try: path = pathlib.Path(self.spec.origin) except TypeError: return None if path.exists(): return readers.FileReader(SimpleNamespace(path=path)) def wrap_spec(package): """ Override _adapters.wrap_spec to use TraversableResourcesLoader from above. Ensures that future behavior is always available on older Pythons. """ return _adapters.SpecLoaderAdapter(package.__spec__, TraversableResourcesLoader)