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ccb706cf0a
(macpath module).
206 lines
5.5 KiB
Python
206 lines
5.5 KiB
Python
"""Pathname and path-related operations for the Macintosh."""
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import os
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from stat import *
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import genericpath
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from genericpath import *
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__all__ = ["normcase","isabs","join","splitdrive","split","splitext",
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"basename","dirname","commonprefix","getsize","getmtime",
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"getatime","getctime", "islink","exists","lexists","isdir","isfile",
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"expanduser","expandvars","normpath","abspath",
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"curdir","pardir","sep","pathsep","defpath","altsep","extsep",
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"devnull","realpath","supports_unicode_filenames"]
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# strings representing various path-related bits and pieces
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# These are primarily for export; internally, they are hardcoded.
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curdir = ':'
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pardir = '::'
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extsep = '.'
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sep = ':'
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pathsep = '\n'
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defpath = ':'
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altsep = None
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devnull = 'Dev:Null'
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def _get_colon(path):
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if isinstance(path, bytes):
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return b':'
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else:
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return ':'
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# Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
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def normcase(path):
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if not isinstance(path, (bytes, str)):
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raise TypeError("normcase() argument must be str or bytes, "
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"not '{}'".format(path.__class__.__name__))
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return path.lower()
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def isabs(s):
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"""Return true if a path is absolute.
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On the Mac, relative paths begin with a colon,
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but as a special case, paths with no colons at all are also relative.
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Anything else is absolute (the string up to the first colon is the
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volume name)."""
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colon = _get_colon(s)
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return colon in s and s[:1] != colon
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def join(s, *p):
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colon = _get_colon(s)
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path = s
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for t in p:
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if (not s) or isabs(t):
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path = t
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continue
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if t[:1] == colon:
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t = t[1:]
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if colon not in path:
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path = colon + path
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if path[-1:] != colon:
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path = path + colon
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path = path + t
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return path
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def split(s):
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"""Split a pathname into two parts: the directory leading up to the final
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bit, and the basename (the filename, without colons, in that directory).
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The result (s, t) is such that join(s, t) yields the original argument."""
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colon = _get_colon(s)
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if colon not in s: return s[:0], s
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col = 0
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for i in range(len(s)):
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if s[i:i+1] == colon: col = i + 1
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path, file = s[:col-1], s[col:]
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if path and not colon in path:
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path = path + colon
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return path, file
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def splitext(p):
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if isinstance(p, bytes):
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return genericpath._splitext(p, b':', altsep, b'.')
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else:
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return genericpath._splitext(p, sep, altsep, extsep)
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splitext.__doc__ = genericpath._splitext.__doc__
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def splitdrive(p):
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"""Split a pathname into a drive specification and the rest of the
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path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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empty (don't use the volume name -- it doesn't have the same
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syntactic and semantic oddities as DOS drive letters, such as there
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being a separate current directory per drive)."""
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return p[:0], p
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# Short interfaces to split()
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def dirname(s): return split(s)[0]
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def basename(s): return split(s)[1]
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def ismount(s):
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if not isabs(s):
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return False
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components = split(s)
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return len(components) == 2 and not components[1]
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def islink(s):
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"""Return true if the pathname refers to a symbolic link."""
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try:
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import Carbon.File
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return Carbon.File.ResolveAliasFile(s, 0)[2]
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except:
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return False
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# Is `stat`/`lstat` a meaningful difference on the Mac? This is safe in any
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# case.
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def lexists(path):
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"""Test whether a path exists. Returns True for broken symbolic links"""
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try:
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st = os.lstat(path)
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except os.error:
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return False
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return True
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def expandvars(path):
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"""Dummy to retain interface-compatibility with other operating systems."""
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return path
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def expanduser(path):
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"""Dummy to retain interface-compatibility with other operating systems."""
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return path
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class norm_error(Exception):
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"""Path cannot be normalized"""
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def normpath(s):
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"""Normalize a pathname. Will return the same result for
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equivalent paths."""
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colon = _get_colon(s)
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if colon not in s:
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return colon + s
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comps = s.split(colon)
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i = 1
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while i < len(comps)-1:
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if not comps[i] and comps[i-1]:
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if i > 1:
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del comps[i-1:i+1]
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i = i - 1
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else:
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# best way to handle this is to raise an exception
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raise norm_error('Cannot use :: immediately after volume name')
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else:
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i = i + 1
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s = colon.join(comps)
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# remove trailing ":" except for ":" and "Volume:"
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if s[-1:] == colon and len(comps) > 2 and s != colon*len(s):
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s = s[:-1]
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return s
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def abspath(path):
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"""Return an absolute path."""
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if not isabs(path):
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if isinstance(path, bytes):
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cwd = os.getcwdb()
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else:
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cwd = os.getcwd()
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path = join(cwd, path)
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return normpath(path)
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# realpath is a no-op on systems without islink support
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def realpath(path):
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path = abspath(path)
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try:
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import Carbon.File
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except ImportError:
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return path
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if not path:
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return path
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colon = _get_colon(path)
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components = path.split(colon)
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path = components[0] + colon
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for c in components[1:]:
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path = join(path, c)
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try:
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path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
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except Carbon.File.Error:
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pass
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return path
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supports_unicode_filenames = True
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