晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //opt/alt/python311/lib64/python3.11/importlib/resources/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(*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)

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