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"""Pathname and path-related operations for the Macintosh.""" import os import warnings from stat import * import genericpath from genericpath import * from genericpath import _unicode __all__ = ["normcase","isabs","join","splitdrive","split","splitext", "basename","dirname","commonprefix","getsize","getmtime", "getatime","getctime", "islink","exists","lexists","isdir","isfile", "walk","expanduser","expandvars","normpath","abspath", "curdir","pardir","sep","pathsep","defpath","altsep","extsep", "devnull","realpath","supports_unicode_filenames"] # strings representing various path-related bits and pieces curdir = ':' pardir = '::' extsep = '.' sep = ':' pathsep = '\n' defpath = ':' altsep = None devnull = 'Dev:Null' # Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here. def normcase(path): 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).""" return ':' in s and s[0] != ':' def join(s, *p): path = s for t in p: if (not path) or isabs(t): path = t continue if t[:1] == ':': t = t[1:] if ':' not in path: path = ':' + path if path[-1:] != ':': path = path + ':' 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.""" if ':' not in s: return '', s colon = 0 for i in range(len(s)): if s[i] == ':': colon = i + 1 path, file = s[:colon-1], s[colon:] if path and not ':' in path: path = path + ':' return path, file def splitext(p): 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 # 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 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.""" if ":" not in s: return ":"+s comps = s.split(":") i = 1 while i < len(comps)-1: if 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 = ":".join(comps) # remove trailing ":" except for ":" and "Volume:" if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s): s = s[:-1] return s def walk(top, func, arg): """Directory tree walk with callback function. For each directory in the directory tree rooted at top (including top itself, but excluding '.' and '..'), call func(arg, dirname, fnames). dirname is the name of the directory, and fnames a list of the names of the files and subdirectories in dirname (excluding '.' and '..'). func may modify the fnames list in-place (e.g. via del or slice assignment), and walk will only recurse into the subdirectories whose names remain in fnames; this can be used to implement a filter, or to impose a specific order of visiting. No semantics are defined for, or required of, arg, beyond that arg is always passed to func. It can be used, e.g., to pass a filename pattern, or a mutable object designed to accumulate statistics. Passing None for arg is common.""" warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.", stacklevel=2) try: names = os.listdir(top) except os.error: return func(arg, top, names) for name in names: name = join(top, name) if isdir(name) and not islink(name): walk(name, func, arg) def abspath(path): """Return an absolute path.""" if not isabs(path): if isinstance(path, _unicode): cwd = os.getcwdu() 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 components = path.split(':') path = components[0] + ':' 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