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File Name : readers.py

from __future__ import annotations

import collections
import contextlib
import itertools
import operator
import pathlib
import re
import warnings
from collections.abc import Iterator

from . import abc
from ._itertools import only
from .compat.py39 import ZipPath

def remove_duplicates(items):
    return iter(collections.OrderedDict.fromkeys(items))

class FileReader(abc.TraversableResources):
    def __init__(self, loader):
        self.path = pathlib.Path(loader.path).parent

def resource_path(self, resource):
        """
        Return the file system path to prevent
        `resources.path()` from creating a temporary
        copy.
        """
        return str(self.path.joinpath(resource))

def files(self):
        return self.path

class ZipReader(abc.TraversableResources):
    def __init__(self, loader, module):
        self.prefix = loader.prefix.replace('\\', '/')
        if loader.is_package(module):
            _, _, name = module.rpartition('.')
            self.prefix += name + '/'
        self.archive = loader.archive

def open_resource(self, resource):
        try:
            return super().open_resource(resource)
        except KeyError as exc:
            raise FileNotFoundError(exc.args[0])

def is_resource(self, path):
        """
        Workaround for `zipfile.Path.is_file` returning true
        for non-existent paths.
        """
        target = self.files().joinpath(path)
        return target.is_file() and target.exists()

def files(self):
        return ZipPath(self.archive, self.prefix)

class MultiplexedPath(abc.Traversable):
    """
    Given a series of Traversable objects, implement a merged
    version of the interface across all objects. Useful for
    namespace packages which may be multihomed at a single
    name.
    """

def __init__(self, *paths):
        self._paths = list(map(_ensure_traversable, remove_duplicates(paths)))
        if not self._paths:
            message = 'MultiplexedPath must contain at least one path'
            raise FileNotFoundError(message)
        if not all(path.is_dir() for path in self._paths):
            raise NotADirectoryError('MultiplexedPath only supports directories')

def iterdir(self):
        children = (child for path in self._paths for child in path.iterdir())
        by_name = operator.attrgetter('name')
        groups = itertools.groupby(sorted(children, key=by_name), key=by_name)
        return map(self._follow, (locs for name, locs in groups))

def read_bytes(self):
        raise FileNotFoundError(f'{self} is not a file')

def read_text(self, *args, **kwargs):
        raise FileNotFoundError(f'{self} is not a file')

def is_dir(self):
        return True

def is_file(self):
        return False

def joinpath(self, *descendants):
        try:
            return super().joinpath(*descendants)
        except abc.TraversalError:
            # One of the paths did not resolve (a directory does not exist).
            # Just return something that will not exist.
            return self._paths[0].joinpath(*descendants)

@classmethod
    def _follow(cls, children):
        """
        Construct a MultiplexedPath if needed.

If children contains a sole element, return it.
        Otherwise, return a MultiplexedPath of the items.
        Unless one of the items is not a Directory, then return the first.
        """
        subdirs, one_dir, one_file = itertools.tee(children, 3)

try:
            return only(one_dir)
        except ValueError:
            try:
                return cls(*subdirs)
            except NotADirectoryError:
                return next(one_file)

def open(self, *args, **kwargs):
        raise FileNotFoundError(f'{self} is not a file')

@property
    def name(self):
        return self._paths[0].name

def __repr__(self):
        paths = ', '.join(f"'{path}'" for path in self._paths)
        return f'MultiplexedPath({paths})'

class NamespaceReader(abc.TraversableResources):
    def __init__(self, namespace_path):
        if 'NamespacePath' not in str(namespace_path):
            raise ValueError('Invalid path')
        self.path = MultiplexedPath(*filter(bool, map(self._resolve, namespace_path)))

@classmethod
    def _resolve(cls, path_str) -> abc.Traversable | None:
        r"""
        Given an item from a namespace path, resolve it to a Traversable.

path_str might be a directory on the filesystem or a path to a
        zipfile plus the path within the zipfile, e.g. ``/foo/bar`` or
        ``/foo/baz.zip/inner_dir`` or ``foo\baz.zip\inner_dir\sub``.

path_str might also be a sentinel used by editable packages to
        trigger other behaviors (see python/importlib_resources#311).
        In that case, return None.
        """
        dirs = (cand for cand in cls._candidate_paths(path_str) if cand.is_dir())
        return next(dirs, None)

@classmethod
    def _candidate_paths(cls, path_str: str) -> Iterator[abc.Traversable]:
        yield pathlib.Path(path_str)
        yield from cls._resolve_zip_path(path_str)

@staticmethod
    def _resolve_zip_path(path_str: str):
        for match in reversed(list(re.finditer(r'[\\/]', path_str))):
            with contextlib.suppress(
                FileNotFoundError,
                IsADirectoryError,
                NotADirectoryError,
                PermissionError,
            ):
                inner = path_str[match.end() :].replace('\\', '/') + '/'
                yield ZipPath(path_str[: match.start()], inner.lstrip('/'))

def files(self):
        return self.path

def _ensure_traversable(path):
    """
    Convert deprecated string arguments to traversables (pathlib.Path).

Remove with Python 3.15.
    """
    if not isinstance(path, str):
        return path

warnings.warn(
        "String arguments are deprecated. Pass a Traversable instead.",
        DeprecationWarning,
        stacklevel=3,
    )

return pathlib.Path(path)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-04-04 08:04:55
..	dir	-	root/root	0755	2025-12-03 07:31:25
__pycache__	dir	-	root/root	0755	2025-04-04 08:04:55
compat	dir	-	root/root	0755	2025-04-04 08:04:55
future	dir	-	root/root	0755	2025-04-04 08:04:55
tests	dir	-	root/root	0755	2025-04-04 08:04:55
__init__.py	text/plain	700 B	root/root	0644	2025-04-04 08:04:55
_adapters.py	text/x-python	4.38 KB	root/root	0644	2025-04-04 08:04:55
_common.py	text/x-python	5.49 KB	root/root	0644	2025-04-04 08:04:55
_functional.py	text/plain	2.68 KB	root/root	0644	2025-04-04 08:04:55
_itertools.py	text/x-python	1.25 KB	root/root	0644	2025-04-04 08:04:55
abc.py	text/x-python	5.42 KB	root/root	0644	2025-04-04 08:04:55
py.typed	application/x-empty	0 B	root/root	0644	2025-04-04 08:04:55
readers.py	text/x-python	6.1 KB	root/root	0644	2025-04-04 08:04:55
simple.py	text/plain	2.53 KB	root/root	0644	2025-04-04 08:04:55

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