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Editing: init.py

"""
A Path-like interface for zipfiles.

This codebase is shared between zipfile.Path in the stdlib
and zipp in PyPI. See
https://github.com/python/importlib_metadata/wiki/Development-Methodology
for more detail.
"""

import io
import posixpath
import zipfile
import itertools
import contextlib
import pathlib
import re

from .glob import translate

__all__ = ['Path']

def _parents(path):
    """
    Given a path with elements separated by
    posixpath.sep, generate all parents of that path.

>>> list(_parents('b/d'))
    ['b']
    >>> list(_parents('/b/d/'))
    ['/b']
    >>> list(_parents('b/d/f/'))
    ['b/d', 'b']
    >>> list(_parents('b'))
    []
    >>> list(_parents(''))
    []
    """
    return itertools.islice(_ancestry(path), 1, None)

def _ancestry(path):
    """
    Given a path with elements separated by
    posixpath.sep, generate all elements of that path.

>>> list(_ancestry('b/d'))
    ['b/d', 'b']
    >>> list(_ancestry('/b/d/'))
    ['/b/d', '/b']
    >>> list(_ancestry('b/d/f/'))
    ['b/d/f', 'b/d', 'b']
    >>> list(_ancestry('b'))
    ['b']
    >>> list(_ancestry(''))
    []

Multiple separators are treated like a single.

>>> list(_ancestry('//b//d///f//'))
    ['//b//d///f', '//b//d', '//b']
    """
    path = path.rstrip(posixpath.sep)
    while path.rstrip(posixpath.sep):
        yield path
        path, tail = posixpath.split(path)

_dedupe = dict.fromkeys
"""Deduplicate an iterable in original order"""

def _difference(minuend, subtrahend):
    """
    Return items in minuend not in subtrahend, retaining order
    with O(1) lookup.
    """
    return itertools.filterfalse(set(subtrahend).__contains__, minuend)

class InitializedState:
    """
    Mix-in to save the initialization state for pickling.
    """

def __init__(self, *args, **kwargs):
        self.__args = args
        self.__kwargs = kwargs
        super().__init__(*args, **kwargs)

def __getstate__(self):
        return self.__args, self.__kwargs

def __setstate__(self, state):
        args, kwargs = state
        super().__init__(*args, **kwargs)

class CompleteDirs(InitializedState, zipfile.ZipFile):
    """
    A ZipFile subclass that ensures that implied directories
    are always included in the namelist.

>>> list(CompleteDirs._implied_dirs(['foo/bar.txt', 'foo/bar/baz.txt']))
    ['foo/', 'foo/bar/']
    >>> list(CompleteDirs._implied_dirs(['foo/bar.txt', 'foo/bar/baz.txt', 'foo/bar/']))
    ['foo/']
    """

@staticmethod
    def _implied_dirs(names):
        parents = itertools.chain.from_iterable(map(_parents, names))
        as_dirs = (p + posixpath.sep for p in parents)
        return _dedupe(_difference(as_dirs, names))

def namelist(self):
        names = super().namelist()
        return names + list(self._implied_dirs(names))

def _name_set(self):
        return set(self.namelist())

def resolve_dir(self, name):
        """
        If the name represents a directory, return that name
        as a directory (with the trailing slash).
        """
        names = self._name_set()
        dirname = name + '/'
        dir_match = name not in names and dirname in names
        return dirname if dir_match else name

def getinfo(self, name):
        """
        Supplement getinfo for implied dirs.
        """
        try:
            return super().getinfo(name)
        except KeyError:
            if not name.endswith('/') or name not in self._name_set():
                raise
            return zipfile.ZipInfo(filename=name)

@classmethod
    def make(cls, source):
        """
        Given a source (filename or zipfile), return an
        appropriate CompleteDirs subclass.
        """
        if isinstance(source, CompleteDirs):
            return source

if not isinstance(source, zipfile.ZipFile):
            return cls(source)

# Only allow for FastLookup when supplied zipfile is read-only
        if 'r' not in source.mode:
            cls = CompleteDirs

source.__class__ = cls
        return source

class FastLookup(CompleteDirs):
    """
    ZipFile subclass to ensure implicit
    dirs exist and are resolved rapidly.
    """

def namelist(self):
        with contextlib.suppress(AttributeError):
            return self.__names
        self.__names = super().namelist()
        return self.__names

def _name_set(self):
        with contextlib.suppress(AttributeError):
            return self.__lookup
        self.__lookup = super()._name_set()
        return self.__lookup

def _extract_text_encoding(encoding=None, *args, **kwargs):
    # stacklevel=3 so that the caller of the caller see any warning.
    return io.text_encoding(encoding, 3), args, kwargs

class Path:
    """
    A :class:`importlib.resources.abc.Traversable` interface for zip files.

Implements many of the features users enjoy from
    :class:`pathlib.Path`.

Consider a zip file with this structure::

.
        ├── a.txt
        └── b
            ├── c.txt
            └── d
                └── e.txt

>>> data = io.BytesIO()
    >>> zf = ZipFile(data, 'w')
    >>> zf.writestr('a.txt', 'content of a')
    >>> zf.writestr('b/c.txt', 'content of c')
    >>> zf.writestr('b/d/e.txt', 'content of e')
    >>> zf.filename = 'mem/abcde.zip'

Path accepts the zipfile object itself or a filename

>>> root = Path(zf)

From there, several path operations are available.

Directory iteration (including the zip file itself):

>>> a, b = root.iterdir()
    >>> a
    Path('mem/abcde.zip', 'a.txt')
    >>> b
    Path('mem/abcde.zip', 'b/')

name property:

>>> b.name
    'b'

join with divide operator:

>>> c = b / 'c.txt'
    >>> c
    Path('mem/abcde.zip', 'b/c.txt')
    >>> c.name
    'c.txt'

Read text:

>>> c.read_text(encoding='utf-8')
    'content of c'

existence:

>>> c.exists()
    True
    >>> (b / 'missing.txt').exists()
    False

Coercion to string:

>>> import os
    >>> str(c).replace(os.sep, posixpath.sep)
    'mem/abcde.zip/b/c.txt'

At the root, ``name``, ``filename``, and ``parent``
    resolve to the zipfile. Note these attributes are not
    valid and will raise a ``ValueError`` if the zipfile
    has no filename.

>>> root.name
    'abcde.zip'
    >>> str(root.filename).replace(os.sep, posixpath.sep)
    'mem/abcde.zip'
    >>> str(root.parent)
    'mem'
    """

__repr = "{self.__class__.__name__}({self.root.filename!r}, {self.at!r})"

def __init__(self, root, at=""):
        """
        Construct a Path from a ZipFile or filename.

Note: When the source is an existing ZipFile object,
        its type (__class__) will be mutated to a
        specialized type. If the caller wishes to retain the
        original type, the caller should either create a
        separate ZipFile object or pass a filename.
        """
        self.root = FastLookup.make(root)
        self.at = at

def __eq__(self, other):
        """
        >>> Path(zipfile.ZipFile(io.BytesIO(), 'w')) == 'foo'
        False
        """
        if self.__class__ is not other.__class__:
            return NotImplemented
        return (self.root, self.at) == (other.root, other.at)

def __hash__(self):
        return hash((self.root, self.at))

def open(self, mode='r', *args, pwd=None, **kwargs):
        """
        Open this entry as text or binary following the semantics
        of ``pathlib.Path.open()`` by passing arguments through
        to io.TextIOWrapper().
        """
        if self.is_dir():
            raise IsADirectoryError(self)
        zip_mode = mode[0]
        if zip_mode == 'r' and not self.exists():
            raise FileNotFoundError(self)
        stream = self.root.open(self.at, zip_mode, pwd=pwd)
        if 'b' in mode:
            if args or kwargs:
                raise ValueError("encoding args invalid for binary operation")
            return stream
        # Text mode:
        encoding, args, kwargs = _extract_text_encoding(*args, **kwargs)
        return io.TextIOWrapper(stream, encoding, *args, **kwargs)

def _base(self):
        return pathlib.PurePosixPath(self.at or self.root.filename)

@property
    def name(self):
        return self._base().name

@property
    def suffix(self):
        return self._base().suffix

@property
    def suffixes(self):
        return self._base().suffixes

@property
    def stem(self):
        return self._base().stem

@property
    def filename(self):
        return pathlib.Path(self.root.filename).joinpath(self.at)

def read_text(self, *args, **kwargs):
        encoding, args, kwargs = _extract_text_encoding(*args, **kwargs)
        with self.open('r', encoding, *args, **kwargs) as strm:
            return strm.read()

def read_bytes(self):
        with self.open('rb') as strm:
            return strm.read()

def _is_child(self, path):
        return posixpath.dirname(path.at.rstrip("/")) == self.at.rstrip("/")

def _next(self, at):
        return self.__class__(self.root, at)

def is_dir(self):
        return not self.at or self.at.endswith("/")

def is_file(self):
        return self.exists() and not self.is_dir()

def exists(self):
        return self.at in self.root._name_set()

def iterdir(self):
        if not self.is_dir():
            raise ValueError("Can't listdir a file")
        subs = map(self._next, self.root.namelist())
        return filter(self._is_child, subs)

def match(self, path_pattern):
        return pathlib.PurePosixPath(self.at).match(path_pattern)

def is_symlink(self):
        """
        Return whether this path is a symlink. Always false (python/cpython#82102).
        """
        return False

def glob(self, pattern):
        if not pattern:
            raise ValueError(f"Unacceptable pattern: {pattern!r}")

prefix = re.escape(self.at)
        matches = re.compile(prefix + translate(pattern)).fullmatch
        return map(self._next, filter(matches, self.root.namelist()))

def rglob(self, pattern):
        return self.glob(f'**/{pattern}')

def relative_to(self, other, *extra):
        return posixpath.relpath(str(self), str(other.joinpath(*extra)))

def __str__(self):
        return posixpath.join(self.root.filename, self.at)

def __repr__(self):
        return self.__repr.format(self=self)

def joinpath(self, *other):
        next = posixpath.join(self.at, *other)
        return self._next(self.root.resolve_dir(next))

__truediv__ = joinpath

@property
    def parent(self):
        if not self.at:
            return self.filename.parent
        parent_at = posixpath.dirname(self.at.rstrip('/'))
        if parent_at:
            parent_at += '/'
        return self._next(parent_at)

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