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