mirror of https://github.com/python/cpython.git
434 lines
15 KiB
Python
434 lines
15 KiB
Python
"""
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Abstract base classes for rich path objects.
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This module is published as a PyPI package called "pathlib-abc".
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This module is also a *PRIVATE* part of the Python standard library, where
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it's developed alongside pathlib. If it finds success and maturity as a PyPI
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package, it could become a public part of the standard library.
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Three base classes are defined here -- JoinablePath, ReadablePath and
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WritablePath.
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"""
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import functools
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import posixpath
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from glob import _PathGlobber, _no_recurse_symlinks
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from pathlib._os import magic_open, CopyReader, CopyWriter
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@functools.cache
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def _is_case_sensitive(parser):
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return parser.normcase('Aa') == 'Aa'
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def _explode_path(path):
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"""
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Split the path into a 2-tuple (anchor, parts), where *anchor* is the
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uppermost parent of the path (equivalent to path.parents[-1]), and
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*parts* is a reversed list of parts following the anchor.
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"""
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split = path.parser.split
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path = str(path)
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parent, name = split(path)
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names = []
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while path != parent:
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names.append(name)
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path = parent
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parent, name = split(path)
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return path, names
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class JoinablePath:
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"""Base class for pure path objects.
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This class *does not* provide several magic methods that are defined in
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its subclass PurePath. They are: __init__, __fspath__, __bytes__,
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__reduce__, __hash__, __eq__, __lt__, __le__, __gt__, __ge__.
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"""
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__slots__ = ()
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parser = posixpath
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def with_segments(self, *pathsegments):
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"""Construct a new path object from any number of path-like objects.
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Subclasses may override this method to customize how new path objects
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are created from methods like `iterdir()`.
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"""
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raise NotImplementedError
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def __str__(self):
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"""Return the string representation of the path, suitable for
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passing to system calls."""
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raise NotImplementedError
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@property
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def anchor(self):
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"""The concatenation of the drive and root, or ''."""
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return _explode_path(self)[0]
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@property
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def name(self):
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"""The final path component, if any."""
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return self.parser.split(str(self))[1]
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@property
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def suffix(self):
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"""
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The final component's last suffix, if any.
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This includes the leading period. For example: '.txt'
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"""
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return self.parser.splitext(self.name)[1]
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@property
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def suffixes(self):
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"""
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A list of the final component's suffixes, if any.
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These include the leading periods. For example: ['.tar', '.gz']
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"""
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split = self.parser.splitext
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stem, suffix = split(self.name)
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suffixes = []
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while suffix:
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suffixes.append(suffix)
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stem, suffix = split(stem)
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return suffixes[::-1]
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@property
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def stem(self):
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"""The final path component, minus its last suffix."""
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return self.parser.splitext(self.name)[0]
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def with_name(self, name):
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"""Return a new path with the file name changed."""
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split = self.parser.split
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if split(name)[0]:
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raise ValueError(f"Invalid name {name!r}")
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return self.with_segments(split(str(self))[0], name)
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def with_stem(self, stem):
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"""Return a new path with the stem changed."""
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suffix = self.suffix
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if not suffix:
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return self.with_name(stem)
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elif not stem:
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# If the suffix is non-empty, we can't make the stem empty.
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raise ValueError(f"{self!r} has a non-empty suffix")
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else:
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return self.with_name(stem + suffix)
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def with_suffix(self, suffix):
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"""Return a new path with the file suffix changed. If the path
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has no suffix, add given suffix. If the given suffix is an empty
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string, remove the suffix from the path.
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"""
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stem = self.stem
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if not stem:
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# If the stem is empty, we can't make the suffix non-empty.
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raise ValueError(f"{self!r} has an empty name")
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elif suffix and not suffix.startswith('.'):
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raise ValueError(f"Invalid suffix {suffix!r}")
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else:
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return self.with_name(stem + suffix)
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@property
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def parts(self):
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"""An object providing sequence-like access to the
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components in the filesystem path."""
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anchor, parts = _explode_path(self)
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if anchor:
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parts.append(anchor)
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return tuple(reversed(parts))
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def joinpath(self, *pathsegments):
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"""Combine this path with one or several arguments, and return a
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new path representing either a subpath (if all arguments are relative
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paths) or a totally different path (if one of the arguments is
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anchored).
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"""
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return self.with_segments(str(self), *pathsegments)
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def __truediv__(self, key):
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try:
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return self.with_segments(str(self), key)
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except TypeError:
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return NotImplemented
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def __rtruediv__(self, key):
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try:
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return self.with_segments(key, str(self))
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except TypeError:
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return NotImplemented
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@property
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def parent(self):
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"""The logical parent of the path."""
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path = str(self)
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parent = self.parser.split(path)[0]
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if path != parent:
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return self.with_segments(parent)
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return self
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@property
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def parents(self):
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"""A sequence of this path's logical parents."""
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split = self.parser.split
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path = str(self)
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parent = split(path)[0]
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parents = []
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while path != parent:
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parents.append(self.with_segments(parent))
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path = parent
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parent = split(path)[0]
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return tuple(parents)
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def full_match(self, pattern, *, case_sensitive=None):
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"""
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Return True if this path matches the given glob-style pattern. The
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pattern is matched against the entire path.
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"""
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if not isinstance(pattern, JoinablePath):
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pattern = self.with_segments(pattern)
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if case_sensitive is None:
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case_sensitive = _is_case_sensitive(self.parser)
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globber = _PathGlobber(pattern.parser.sep, case_sensitive, recursive=True)
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match = globber.compile(str(pattern))
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return match(str(self)) is not None
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class ReadablePath(JoinablePath):
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"""Base class for concrete path objects.
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This class provides dummy implementations for many methods that derived
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classes can override selectively; the default implementations raise
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NotImplementedError. The most basic methods, such as stat() and open(),
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directly raise NotImplementedError; these basic methods are called by
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other methods such as is_dir() and read_text().
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The Path class derives this class to implement local filesystem paths.
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Users may derive their own classes to implement virtual filesystem paths,
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such as paths in archive files or on remote storage systems.
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"""
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__slots__ = ()
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@property
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def info(self):
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"""
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A PathInfo object that exposes the file type and other file attributes
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of this path.
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"""
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raise NotImplementedError
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def exists(self, *, follow_symlinks=True):
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"""
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Whether this path exists.
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This method normally follows symlinks; to check whether a symlink exists,
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add the argument follow_symlinks=False.
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"""
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info = self.joinpath().info
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return info.exists(follow_symlinks=follow_symlinks)
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def is_dir(self, *, follow_symlinks=True):
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"""
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Whether this path is a directory.
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"""
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info = self.joinpath().info
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return info.is_dir(follow_symlinks=follow_symlinks)
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def is_file(self, *, follow_symlinks=True):
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"""
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Whether this path is a regular file (also True for symlinks pointing
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to regular files).
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"""
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info = self.joinpath().info
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return info.is_file(follow_symlinks=follow_symlinks)
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def is_symlink(self):
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"""
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Whether this path is a symbolic link.
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"""
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info = self.joinpath().info
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return info.is_symlink()
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def __open_rb__(self, buffering=-1):
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"""
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Open the file pointed to by this path for reading in binary mode and
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return a file object, like open(mode='rb').
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"""
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raise NotImplementedError
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def read_bytes(self):
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"""
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Open the file in bytes mode, read it, and close the file.
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"""
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with magic_open(self, mode='rb', buffering=0) as f:
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return f.read()
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def read_text(self, encoding=None, errors=None, newline=None):
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"""
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Open the file in text mode, read it, and close the file.
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"""
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with magic_open(self, mode='r', encoding=encoding, errors=errors, newline=newline) as f:
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return f.read()
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def iterdir(self):
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"""Yield path objects of the directory contents.
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The children are yielded in arbitrary order, and the
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special entries '.' and '..' are not included.
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"""
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raise NotImplementedError
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def glob(self, pattern, *, case_sensitive=None, recurse_symlinks=True):
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"""Iterate over this subtree and yield all existing files (of any
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kind, including directories) matching the given relative pattern.
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"""
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if not isinstance(pattern, JoinablePath):
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pattern = self.with_segments(pattern)
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anchor, parts = _explode_path(pattern)
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if anchor:
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raise NotImplementedError("Non-relative patterns are unsupported")
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if case_sensitive is None:
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case_sensitive = _is_case_sensitive(self.parser)
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case_pedantic = False
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elif case_sensitive == _is_case_sensitive(self.parser):
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case_pedantic = False
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else:
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case_pedantic = True
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recursive = True if recurse_symlinks else _no_recurse_symlinks
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globber = _PathGlobber(self.parser.sep, case_sensitive, case_pedantic, recursive)
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select = globber.selector(parts)
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return select(self.joinpath(''))
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def rglob(self, pattern, *, case_sensitive=None, recurse_symlinks=True):
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"""Recursively yield all existing files (of any kind, including
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directories) matching the given relative pattern, anywhere in
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this subtree.
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"""
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if not isinstance(pattern, JoinablePath):
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pattern = self.with_segments(pattern)
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pattern = '**' / pattern
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return self.glob(pattern, case_sensitive=case_sensitive, recurse_symlinks=recurse_symlinks)
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def walk(self, top_down=True, on_error=None, follow_symlinks=False):
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"""Walk the directory tree from this directory, similar to os.walk()."""
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paths = [self]
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while paths:
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path = paths.pop()
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if isinstance(path, tuple):
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yield path
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continue
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dirnames = []
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filenames = []
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if not top_down:
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paths.append((path, dirnames, filenames))
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try:
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for child in path.iterdir():
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try:
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if child.info.is_dir(follow_symlinks=follow_symlinks):
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if not top_down:
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paths.append(child)
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dirnames.append(child.name)
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else:
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filenames.append(child.name)
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except OSError:
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filenames.append(child.name)
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except OSError as error:
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if on_error is not None:
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on_error(error)
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if not top_down:
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while not isinstance(paths.pop(), tuple):
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pass
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continue
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if top_down:
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yield path, dirnames, filenames
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paths += [path.joinpath(d) for d in reversed(dirnames)]
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def readlink(self):
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"""
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Return the path to which the symbolic link points.
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"""
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raise NotImplementedError
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_copy_reader = property(CopyReader)
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def copy(self, target, follow_symlinks=True, dirs_exist_ok=False,
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preserve_metadata=False):
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"""
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Recursively copy this file or directory tree to the given destination.
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"""
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if not hasattr(target, '_copy_writer'):
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target = self.with_segments(target)
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# Delegate to the target path's CopyWriter object.
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try:
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create = target._copy_writer._create
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except AttributeError:
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raise TypeError(f"Target is not writable: {target}") from None
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return create(self, follow_symlinks, dirs_exist_ok, preserve_metadata)
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def copy_into(self, target_dir, *, follow_symlinks=True,
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dirs_exist_ok=False, preserve_metadata=False):
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"""
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Copy this file or directory tree into the given existing directory.
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"""
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name = self.name
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if not name:
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raise ValueError(f"{self!r} has an empty name")
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elif hasattr(target_dir, '_copy_writer'):
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target = target_dir / name
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else:
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target = self.with_segments(target_dir, name)
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return self.copy(target, follow_symlinks=follow_symlinks,
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dirs_exist_ok=dirs_exist_ok,
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preserve_metadata=preserve_metadata)
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class WritablePath(JoinablePath):
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__slots__ = ()
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def symlink_to(self, target, target_is_directory=False):
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"""
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Make this path a symlink pointing to the target path.
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Note the order of arguments (link, target) is the reverse of os.symlink.
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"""
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raise NotImplementedError
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def mkdir(self, mode=0o777, parents=False, exist_ok=False):
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"""
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Create a new directory at this given path.
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"""
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raise NotImplementedError
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def __open_wb__(self, buffering=-1):
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"""
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Open the file pointed to by this path for writing in binary mode and
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return a file object, like open(mode='wb').
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"""
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raise NotImplementedError
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def write_bytes(self, data):
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"""
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Open the file in bytes mode, write to it, and close the file.
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"""
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# type-check for the buffer interface before truncating the file
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view = memoryview(data)
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with magic_open(self, mode='wb') as f:
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return f.write(view)
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def write_text(self, data, encoding=None, errors=None, newline=None):
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"""
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Open the file in text mode, write to it, and close the file.
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"""
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if not isinstance(data, str):
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raise TypeError('data must be str, not %s' %
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data.__class__.__name__)
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with magic_open(self, mode='w', encoding=encoding, errors=errors, newline=newline) as f:
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return f.write(data)
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_copy_writer = property(CopyWriter)
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