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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.
    """

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

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

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

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

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

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

def __init__(self, reader: SimpleReader):
        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()

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

def __init__(self, parent: ResourceContainer, name: str):
        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(*args, **kwargs)
        return stream

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

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)

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2023-09-24 06:26:01
..	dir	-	root/root	0755	2023-09-24 06:26:01
__pycache__	dir	-	root/root	0755	2023-09-24 06:26:01
__init__.py	text/plain	506 B	root/root	0644	2023-09-05 09:10:13
_adapters.py	text/x-python	4.4 KB	root/root	0644	2023-09-05 09:10:13
_common.py	text/x-python	5.33 KB	root/root	0644	2023-09-05 09:10:13
_compat.py	text/x-python	2.86 KB	root/root	0644	2023-09-05 09:10:13
_itertools.py	text/x-python	884 B	root/root	0644	2023-09-05 09:10:13
_legacy.py	text/x-python	3.4 KB	root/root	0644	2023-09-05 09:10:13
abc.py	text/x-python	5.02 KB	root/root	0644	2023-09-05 09:10:13
readers.py	text/x-python	3.5 KB	root/root	0644	2023-09-05 09:10:13
simple.py	text/plain	2.52 KB	root/root	0644	2023-09-05 09:10:13