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99 lines
2.6 KiB
99 lines
2.6 KiB
3 years ago
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# flake8: noqa
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import abc
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import sys
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import pathlib
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from contextlib import suppress
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if sys.version_info >= (3, 10):
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from zipfile import Path as ZipPath # type: ignore
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else:
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from zipp import Path as ZipPath # type: ignore
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try:
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from typing import runtime_checkable # type: ignore
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except ImportError:
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def runtime_checkable(cls): # type: ignore
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return cls
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try:
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from typing import Protocol # type: ignore
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except ImportError:
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Protocol = abc.ABC # type: ignore
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class TraversableResourcesLoader:
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"""
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Adapt loaders to provide TraversableResources and other
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compatibility.
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Used primarily for Python 3.9 and earlier where the native
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loaders do not yet implement TraversableResources.
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"""
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def __init__(self, spec):
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self.spec = spec
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@property
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def path(self):
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return self.spec.origin
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def get_resource_reader(self, name):
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from . import readers, _adapters
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def _zip_reader(spec):
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with suppress(AttributeError):
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return readers.ZipReader(spec.loader, spec.name)
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def _namespace_reader(spec):
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with suppress(AttributeError, ValueError):
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return readers.NamespaceReader(spec.submodule_search_locations)
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def _available_reader(spec):
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with suppress(AttributeError):
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return spec.loader.get_resource_reader(spec.name)
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def _native_reader(spec):
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reader = _available_reader(spec)
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return reader if hasattr(reader, 'files') else None
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def _file_reader(spec):
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try:
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path = pathlib.Path(self.path)
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except TypeError:
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return None
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if path.exists():
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return readers.FileReader(self)
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return (
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# native reader if it supplies 'files'
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_native_reader(self.spec)
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or
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# local ZipReader if a zip module
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_zip_reader(self.spec)
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or
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# local NamespaceReader if a namespace module
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_namespace_reader(self.spec)
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or
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# local FileReader
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_file_reader(self.spec)
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# fallback - adapt the spec ResourceReader to TraversableReader
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or _adapters.CompatibilityFiles(self.spec)
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)
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def wrap_spec(package):
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"""
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Construct a package spec with traversable compatibility
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on the spec/loader/reader.
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Supersedes _adapters.wrap_spec to use TraversableResourcesLoader
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from above for older Python compatibility (<3.10).
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"""
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from . import _adapters
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return _adapters.SpecLoaderAdapter(package.__spec__, TraversableResourcesLoader)
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