forked from mrlan/EnglishPal
330 lines
8.2 KiB
Python
330 lines
8.2 KiB
Python
import io
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import posixpath
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import zipfile
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import itertools
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import contextlib
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import sys
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import pathlib
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if sys.version_info < (3, 7):
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from collections import OrderedDict
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else:
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OrderedDict = dict
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__all__ = ['Path']
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def _parents(path):
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"""
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Given a path with elements separated by
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posixpath.sep, generate all parents of that path.
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>>> list(_parents('b/d'))
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['b']
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>>> list(_parents('/b/d/'))
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['/b']
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>>> list(_parents('b/d/f/'))
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['b/d', 'b']
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>>> list(_parents('b'))
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[]
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>>> list(_parents(''))
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[]
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"""
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return itertools.islice(_ancestry(path), 1, None)
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def _ancestry(path):
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"""
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Given a path with elements separated by
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posixpath.sep, generate all elements of that path
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>>> list(_ancestry('b/d'))
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['b/d', 'b']
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>>> list(_ancestry('/b/d/'))
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['/b/d', '/b']
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>>> list(_ancestry('b/d/f/'))
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['b/d/f', 'b/d', 'b']
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>>> list(_ancestry('b'))
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['b']
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>>> list(_ancestry(''))
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[]
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"""
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path = path.rstrip(posixpath.sep)
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while path and path != posixpath.sep:
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yield path
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path, tail = posixpath.split(path)
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_dedupe = OrderedDict.fromkeys
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"""Deduplicate an iterable in original order"""
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def _difference(minuend, subtrahend):
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"""
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Return items in minuend not in subtrahend, retaining order
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with O(1) lookup.
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"""
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return itertools.filterfalse(set(subtrahend).__contains__, minuend)
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class CompleteDirs(zipfile.ZipFile):
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"""
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A ZipFile subclass that ensures that implied directories
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are always included in the namelist.
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"""
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@staticmethod
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def _implied_dirs(names):
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parents = itertools.chain.from_iterable(map(_parents, names))
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as_dirs = (p + posixpath.sep for p in parents)
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return _dedupe(_difference(as_dirs, names))
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def namelist(self):
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names = super(CompleteDirs, self).namelist()
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return names + list(self._implied_dirs(names))
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def _name_set(self):
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return set(self.namelist())
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def resolve_dir(self, name):
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"""
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If the name represents a directory, return that name
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as a directory (with the trailing slash).
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"""
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names = self._name_set()
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dirname = name + '/'
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dir_match = name not in names and dirname in names
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return dirname if dir_match else name
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@classmethod
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def make(cls, source):
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"""
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Given a source (filename or zipfile), return an
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appropriate CompleteDirs subclass.
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"""
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if isinstance(source, CompleteDirs):
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return source
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if not isinstance(source, zipfile.ZipFile):
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return cls(_pathlib_compat(source))
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# Only allow for FastLookup when supplied zipfile is read-only
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if 'r' not in source.mode:
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cls = CompleteDirs
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source.__class__ = cls
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return source
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class FastLookup(CompleteDirs):
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"""
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ZipFile subclass to ensure implicit
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dirs exist and are resolved rapidly.
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"""
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def namelist(self):
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with contextlib.suppress(AttributeError):
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return self.__names
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self.__names = super(FastLookup, self).namelist()
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return self.__names
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def _name_set(self):
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with contextlib.suppress(AttributeError):
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return self.__lookup
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self.__lookup = super(FastLookup, self)._name_set()
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return self.__lookup
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def _pathlib_compat(path):
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"""
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For path-like objects, convert to a filename for compatibility
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on Python 3.6.1 and earlier.
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"""
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try:
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return path.__fspath__()
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except AttributeError:
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return str(path)
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class Path:
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"""
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A pathlib-compatible interface for zip files.
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Consider a zip file with this structure::
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.
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├── a.txt
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└── b
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├── c.txt
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└── d
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└── e.txt
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>>> data = io.BytesIO()
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>>> zf = zipfile.ZipFile(data, 'w')
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>>> zf.writestr('a.txt', 'content of a')
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>>> zf.writestr('b/c.txt', 'content of c')
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>>> zf.writestr('b/d/e.txt', 'content of e')
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>>> zf.filename = 'mem/abcde.zip'
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Path accepts the zipfile object itself or a filename
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>>> root = Path(zf)
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From there, several path operations are available.
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Directory iteration (including the zip file itself):
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>>> a, b = root.iterdir()
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>>> a
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Path('mem/abcde.zip', 'a.txt')
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>>> b
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Path('mem/abcde.zip', 'b/')
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name property:
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>>> b.name
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'b'
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join with divide operator:
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>>> c = b / 'c.txt'
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>>> c
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Path('mem/abcde.zip', 'b/c.txt')
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>>> c.name
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'c.txt'
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Read text:
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>>> c.read_text()
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'content of c'
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existence:
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>>> c.exists()
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True
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>>> (b / 'missing.txt').exists()
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False
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Coercion to string:
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>>> import os
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>>> str(c).replace(os.sep, posixpath.sep)
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'mem/abcde.zip/b/c.txt'
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At the root, ``name``, ``filename``, and ``parent``
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resolve to the zipfile. Note these attributes are not
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valid and will raise a ``ValueError`` if the zipfile
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has no filename.
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>>> root.name
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'abcde.zip'
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>>> str(root.filename).replace(os.sep, posixpath.sep)
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'mem/abcde.zip'
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>>> str(root.parent)
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'mem'
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"""
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__repr = "{self.__class__.__name__}({self.root.filename!r}, {self.at!r})"
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def __init__(self, root, at=""):
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"""
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Construct a Path from a ZipFile or filename.
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Note: When the source is an existing ZipFile object,
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its type (__class__) will be mutated to a
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specialized type. If the caller wishes to retain the
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original type, the caller should either create a
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separate ZipFile object or pass a filename.
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"""
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self.root = FastLookup.make(root)
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self.at = at
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def open(self, mode='r', *args, pwd=None, **kwargs):
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"""
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Open this entry as text or binary following the semantics
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of ``pathlib.Path.open()`` by passing arguments through
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to io.TextIOWrapper().
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"""
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if self.is_dir():
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raise IsADirectoryError(self)
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zip_mode = mode[0]
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if not self.exists() and zip_mode == 'r':
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raise FileNotFoundError(self)
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stream = self.root.open(self.at, zip_mode, pwd=pwd)
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if 'b' in mode:
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if args or kwargs:
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raise ValueError("encoding args invalid for binary operation")
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return stream
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return io.TextIOWrapper(stream, *args, **kwargs)
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@property
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def name(self):
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return pathlib.Path(self.at).name or self.filename.name
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@property
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def suffix(self):
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return pathlib.Path(self.at).suffix or self.filename.suffix
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@property
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def suffixes(self):
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return pathlib.Path(self.at).suffixes or self.filename.suffixes
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@property
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def stem(self):
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return pathlib.Path(self.at).stem or self.filename.stem
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@property
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def filename(self):
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return pathlib.Path(self.root.filename).joinpath(self.at)
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def read_text(self, *args, **kwargs):
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with self.open('r', *args, **kwargs) as strm:
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return strm.read()
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def read_bytes(self):
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with self.open('rb') as strm:
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return strm.read()
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def _is_child(self, path):
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return posixpath.dirname(path.at.rstrip("/")) == self.at.rstrip("/")
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def _next(self, at):
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return self.__class__(self.root, at)
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def is_dir(self):
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return not self.at or self.at.endswith("/")
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def is_file(self):
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return self.exists() and not self.is_dir()
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def exists(self):
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return self.at in self.root._name_set()
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def iterdir(self):
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if not self.is_dir():
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raise ValueError("Can't listdir a file")
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subs = map(self._next, self.root.namelist())
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return filter(self._is_child, subs)
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def __str__(self):
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return posixpath.join(self.root.filename, self.at)
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def __repr__(self):
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return self.__repr.format(self=self)
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def joinpath(self, *other):
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next = posixpath.join(self.at, *map(_pathlib_compat, other))
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return self._next(self.root.resolve_dir(next))
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__truediv__ = joinpath
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@property
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def parent(self):
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if not self.at:
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return self.filename.parent
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parent_at = posixpath.dirname(self.at.rstrip('/'))
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if parent_at:
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parent_at += '/'
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return self._next(parent_at)
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