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import os import io from . import _common from ._common import as_file, files from .abc import ResourceReader from contextlib import suppress from importlib.abc import ResourceLoader from importlib.machinery import ModuleSpec from io import BytesIO, TextIOWrapper from pathlib import Path from types import ModuleType from typing import ContextManager, Iterable, Union from typing import cast from typing.io import BinaryIO, TextIO from collections.abc import Sequence from functools import singledispatch __all__ = [ 'Package', 'Resource', 'ResourceReader', 'as_file', 'contents', 'files', 'is_resource', 'open_binary', 'open_text', 'path', 'read_binary', 'read_text', ] Package = Union[str, ModuleType] Resource = Union[str, os.PathLike] def open_binary(package: Package, resource: Resource) -> BinaryIO: """Return a file-like object opened for binary reading of the resource.""" resource = _common.normalize_path(resource) package = _common.get_package(package) reader = _common.get_resource_reader(package) if reader is not None: return reader.open_resource(resource) spec = cast(ModuleSpec, package.__spec__) # Using pathlib doesn't work well here due to the lack of 'strict' # argument for pathlib.Path.resolve() prior to Python 3.6. if spec.submodule_search_locations is not None: paths = spec.submodule_search_locations elif spec.origin is not None: paths = [os.path.dirname(os.path.abspath(spec.origin))] for package_path in paths: full_path = os.path.join(package_path, resource) try: return open(full_path, mode='rb') except OSError: # Just assume the loader is a resource loader; all the relevant # importlib.machinery loaders are and an AttributeError for # get_data() will make it clear what is needed from the loader. loader = cast(ResourceLoader, spec.loader) data = None if hasattr(spec.loader, 'get_data'): with suppress(OSError): data = loader.get_data(full_path) if data is not None: return BytesIO(data) raise FileNotFoundError(f'{resource!r} resource not found in {spec.name!r}') def open_text( package: Package, resource: Resource, encoding: str = 'utf-8', errors: str = 'strict', ) -> TextIO: """Return a file-like object opened for text reading of the resource.""" return TextIOWrapper( open_binary(package, resource), encoding=encoding, errors=errors ) def read_binary(package: Package, resource: Resource) -> bytes: """Return the binary contents of the resource.""" with open_binary(package, resource) as fp: return fp.read() def read_text( package: Package, resource: Resource, encoding: str = 'utf-8', errors: str = 'strict', ) -> str: """Return the decoded string of the resource. The decoding-related arguments have the same semantics as those of bytes.decode(). """ with open_text(package, resource, encoding, errors) as fp: return fp.read() def path( package: Package, resource: Resource, ) -> 'ContextManager[Path]': """A context manager providing a file path object to the resource. If the resource does not already exist on its own on the file system, a temporary file will be created. If the file was created, the file will be deleted upon exiting the context manager (no exception is raised if the file was deleted prior to the context manager exiting). """ reader = _common.get_resource_reader(_common.get_package(package)) return ( _path_from_reader(reader, _common.normalize_path(resource)) if reader else _common.as_file( _common.files(package).joinpath(_common.normalize_path(resource)) ) ) def _path_from_reader(reader, resource): return _path_from_resource_path(reader, resource) or _path_from_open_resource( reader, resource ) def _path_from_resource_path(reader, resource): with suppress(FileNotFoundError): return Path(reader.resource_path(resource)) def _path_from_open_resource(reader, resource): saved = io.BytesIO(reader.open_resource(resource).read()) return _common._tempfile(saved.read, suffix=resource) def is_resource(package: Package, name: str) -> bool: """True if 'name' is a resource inside 'package'. Directories are *not* resources. """ package = _common.get_package(package) _common.normalize_path(name) reader = _common.get_resource_reader(package) if reader is not None: return reader.is_resource(name) package_contents = set(contents(package)) if name not in package_contents: return False return (_common.from_package(package) / name).is_file() def contents(package: Package) -> Iterable[str]: """Return an iterable of entries in 'package'. Note that not all entries are resources. Specifically, directories are not considered resources. Use `is_resource()` on each entry returned here to check if it is a resource or not. """ package = _common.get_package(package) reader = _common.get_resource_reader(package) if reader is not None: return _ensure_sequence(reader.contents()) transversable = _common.from_package(package) if transversable.is_dir(): return list(item.name for item in transversable.iterdir()) return [] @singledispatch def _ensure_sequence(iterable): return list(iterable) @_ensure_sequence.register(Sequence) def _(iterable): return iterable