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abc.py

import abc
import io
import itertools
import os
import pathlib
from typing import Any, BinaryIO, Iterable, Iterator, NoReturn, Text, Optional
from typing import runtime_checkable, Protocol
from typing import Union

StrPath = Union[str, os.PathLike[str]]

__all__ = ["ResourceReader", "Traversable", "TraversableResources"]

class ResourceReader(metaclass=abc.ABCMeta):
    """Abstract base class for loaders to provide resource reading support."""

@abc.abstractmethod
    def open_resource(self, resource: Text) -> BinaryIO:
        """Return an opened, file-like object for binary reading.

The 'resource' argument is expected to represent only a file name.
        If the resource cannot be found, FileNotFoundError is raised.
        """
        # This deliberately raises FileNotFoundError instead of
        # NotImplementedError so that if this method is accidentally called,
        # it'll still do the right thing.
        raise FileNotFoundError

@abc.abstractmethod
    def resource_path(self, resource: Text) -> Text:
        """Return the file system path to the specified resource.

The 'resource' argument is expected to represent only a file name.
        If the resource does not exist on the file system, raise
        FileNotFoundError.
        """
        # This deliberately raises FileNotFoundError instead of
        # NotImplementedError so that if this method is accidentally called,
        # it'll still do the right thing.
        raise FileNotFoundError

@abc.abstractmethod
    def is_resource(self, path: Text) -> bool:
        """Return True if the named 'path' is a resource.

Files are resources, directories are not.
        """
        raise FileNotFoundError

@abc.abstractmethod
    def contents(self) -> Iterable[str]:
        """Return an iterable of entries in `package`."""
        raise FileNotFoundError

class TraversalError(Exception):
    pass

@runtime_checkable
class Traversable(Protocol):
    """
    An object with a subset of pathlib.Path methods suitable for
    traversing directories and opening files.

Any exceptions that occur when accessing the backing resource
    may propagate unaltered.
    """

@abc.abstractmethod
    def iterdir(self) -> Iterator["Traversable"]:
        """
        Yield Traversable objects in self
        """

def read_bytes(self) -> bytes:
        """
        Read contents of self as bytes
        """
        with self.open('rb') as strm:
            return strm.read()

def read_text(self, encoding: Optional[str] = None) -> str:
        """
        Read contents of self as text
        """
        with self.open(encoding=encoding) as strm:
            return strm.read()

@abc.abstractmethod
    def is_dir(self) -> bool:
        """
        Return True if self is a directory
        """

@abc.abstractmethod
    def is_file(self) -> bool:
        """
        Return True if self is a file
        """

def joinpath(self, *descendants: StrPath) -> "Traversable":
        """
        Return Traversable resolved with any descendants applied.

Each descendant should be a path segment relative to self
        and each may contain multiple levels separated by
        ``posixpath.sep`` (``/``).
        """
        if not descendants:
            return self
        names = itertools.chain.from_iterable(
            path.parts for path in map(pathlib.PurePosixPath, descendants)
        )
        target = next(names)
        matches = (
            traversable for traversable in self.iterdir() if traversable.name == target
        )
        try:
            match = next(matches)
        except StopIteration:
            raise TraversalError(
                "Target not found during traversal.", target, list(names)
            )
        return match.joinpath(*names)

def __truediv__(self, child: StrPath) -> "Traversable":
        """
        Return Traversable child in self
        """
        return self.joinpath(child)

@abc.abstractmethod
    def open(self, mode='r', *args, **kwargs):
        """
        mode may be 'r' or 'rb' to open as text or binary. Return a handle
        suitable for reading (same as pathlib.Path.open).

When opening as text, accepts encoding parameters such as those
        accepted by io.TextIOWrapper.
        """

@property
    @abc.abstractmethod
    def name(self) -> str:
        """
        The base name of this object without any parent references.
        """

class TraversableResources(ResourceReader):
    """
    The required interface for providing traversable
    resources.
    """

@abc.abstractmethod
    def files(self) -> "Traversable":
        """Return a Traversable object for the loaded package."""

def open_resource(self, resource: StrPath) -> io.BufferedReader:
        return self.files().joinpath(resource).open('rb')

def resource_path(self, resource: Any) -> NoReturn:
        raise FileNotFoundError(resource)

def is_resource(self, path: StrPath) -> bool:
        return self.files().joinpath(path).is_file()

def contents(self) -> Iterator[str]:
        return (item.name for item in self.files().iterdir())

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	drwxr-xr-x	2026-08-24 11:00:29
..	dir	-	root/linksafe	drwxr-xr-x	2026-08-24 11:00:29
__pycache__	dir	-	root/linksafe	drwxr-xr-x	2026-08-24 11:00:29
__init__.py	text/plain	532 B	root/linksafe	-rw-r--r--	2026-08-17 03:23:19
_adapters.py	text/x-script.python	4.38 KB	root/linksafe	-rw-r--r--	2026-08-17 03:23:19
_common.py	text/x-script.python	5.36 KB	root/linksafe	-rw-r--r--	2026-08-17 03:23:19
_itertools.py	text/x-script.python	1.25 KB	root/linksafe	-rw-r--r--	2026-08-17 03:23:19
_legacy.py	text/x-script.python	2.88 KB	root/linksafe	-rw-r--r--	2026-08-17 03:23:19
abc.py	text/x-script.python	5.08 KB	root/linksafe	-rw-r--r--	2026-08-17 03:23:19
readers.py	text/x-script.python	4.27 KB	root/linksafe	-rw-r--r--	2026-08-17 03:23:19
simple.py	text/plain	2.52 KB	root/linksafe	-rw-r--r--	2026-08-17 03:23:19