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simple.py

"""
Interface adapters for low-level readers.
"""

import abc
import io
import itertools
from typing import BinaryIO, List

from .abc import Traversable, TraversableResources

class SimpleReader(abc.ABC):
    """
    The minimum, low-level interface required from a resource
    provider.
    """

@abc.abstractproperty
    def package(self):
        # type: () -> str
        """
        The name of the package for which this reader loads resources.
        """

@abc.abstractmethod
    def children(self):
        # type: () -> List['SimpleReader']
        """
        Obtain an iterable of SimpleReader for available
        child containers (e.g. directories).
        """

@abc.abstractmethod
    def resources(self):
        # type: () -> List[str]
        """
        Obtain available named resources for this virtual package.
        """

@abc.abstractmethod
    def open_binary(self, resource):
        # type: (str) -> BinaryIO
        """
        Obtain a File-like for a named resource.
        """

@property
    def name(self):
        return self.package.split('.')[-1]

class ResourceHandle(Traversable):
    """
    Handle to a named resource in a ResourceReader.
    """

def __init__(self, parent, name):
        # type: (ResourceContainer, str) -> None
        self.parent = parent
        self.name = name  # type: ignore

def is_file(self):
        return True

def is_dir(self):
        return False

def open(self, mode='r', *args, **kwargs):
        stream = self.parent.reader.open_binary(self.name)
        if 'b' not in mode:
            stream = io.TextIOWrapper(stream, *args, **kwargs)
        return stream

def joinpath(self, name):
        raise RuntimeError("Cannot traverse into a resource")

class ResourceContainer(Traversable):
    """
    Traversable container for a package's resources via its reader.
    """

def __init__(self, reader):
        # type: (SimpleReader) -> None
        self.reader = reader

def is_dir(self):
        return True

def is_file(self):
        return False

def iterdir(self):
        files = (ResourceHandle(self, name) for name in self.reader.resources)
        dirs = map(ResourceContainer, self.reader.children())
        return itertools.chain(files, dirs)

def open(self, *args, **kwargs):
        raise IsADirectoryError()

@staticmethod
    def _flatten(compound_names):
        for name in compound_names:
            yield from name.split('/')

def joinpath(self, *descendants):
        if not descendants:
            return self
        names = self._flatten(descendants)
        target = next(names)
        return next(
            traversable for traversable in self.iterdir() if traversable.name == target
        ).joinpath(*names)

class TraversableReader(TraversableResources, SimpleReader):
    """
    A TraversableResources based on SimpleReader. Resource providers
    may derive from this class to provide the TraversableResources
    interface by supplying the SimpleReader interface.
    """

def files(self):
        return ResourceContainer(self)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2026-06-03 03:21:52
..	dir	-	root/root	drwxr-xr-x	2026-06-03 03:21:52
__pycache__	dir	-	root/root	drwxr-xr-x	2026-06-03 03:21:52
__init__.py	text/x-python	506 B	root/root	-rw-r--r--	2025-06-04 01:38:25
_adapters.py	text/x-python	4.4 KB	root/root	-rw-r--r--	2025-06-04 01:38:25
_common.py	text/x-python	2.82 KB	root/root	-rw-r--r--	2025-06-04 01:38:25
_itertools.py	text/x-python	884 B	root/root	-rw-r--r--	2025-06-04 01:38:25
_legacy.py	text/x-python	3.41 KB	root/root	-rw-r--r--	2025-06-04 01:38:25
abc.py	text/x-python	4.46 KB	root/root	-rw-r--r--	2025-06-04 01:38:25
readers.py	text/x-python	3.47 KB	root/root	-rw-r--r--	2025-06-04 01:38:25
simple.py	text/x-python	3.05 KB	root/root	-rw-r--r--	2025-06-04 01:38:25