JezK
Edit File: os2emxpath.py
# Module 'os2emxpath' -- common operations on OS/2 pathnames """Common pathname manipulations, OS/2 EMX version. Instead of importing this module directly, import os and refer to this module as os.path. """ import os import stat from genericpath import * from genericpath import _unicode from ntpath import (expanduser, expandvars, isabs, islink, splitdrive, splitext, split, walk) __all__ = ["normcase","isabs","join","splitdrive","split","splitext", "basename","dirname","commonprefix","getsize","getmtime", "getatime","getctime", "islink","exists","lexists","isdir","isfile", "ismount","walk","expanduser","expandvars","normpath","abspath", "splitunc","curdir","pardir","sep","pathsep","defpath","altsep", "extsep","devnull","realpath","supports_unicode_filenames"] # strings representing various path-related bits and pieces curdir = '.' pardir = '..' extsep = '.' sep = '/' altsep = '\\' pathsep = ';' defpath = '.;C:\\bin' devnull = 'nul' # Normalize the case of a pathname and map slashes to backslashes. # Other normalizations (such as optimizing '../' away) are not done # (this is done by normpath). def normcase(s): """Normalize case of pathname. Makes all characters lowercase and all altseps into seps.""" return s.replace('\\', '/').lower() # Join two (or more) paths. def join(a, *p): """Join two or more pathname components, inserting sep as needed""" path = a for b in p: if isabs(b): path = b elif path == '' or path[-1:] in '/\\:': path = path + b else: path = path + '/' + b return path # Parse UNC paths def splitunc(p): """Split a pathname into UNC mount point and relative path specifiers. Return a 2-tuple (unc, rest); either part may be empty. If unc is not empty, it has the form '//host/mount' (or similar using backslashes). unc+rest is always the input path. Paths containing drive letters never have a UNC part. """ if p[1:2] == ':': return '', p # Drive letter present firstTwo = p[0:2] if firstTwo == '/' * 2 or firstTwo == '\\' * 2: # is a UNC path: # vvvvvvvvvvvvvvvvvvvv equivalent to drive letter # \\machine\mountpoint\directories... # directory ^^^^^^^^^^^^^^^ normp = normcase(p) index = normp.find('/', 2) if index == -1: ##raise RuntimeError, 'illegal UNC path: "' + p + '"' return ("", p) index = normp.find('/', index + 1) if index == -1: index = len(p) return p[:index], p[index:] return '', p # Return the tail (basename) part of a path. def basename(p): """Returns the final component of a pathname""" return split(p)[1] # Return the head (dirname) part of a path. def dirname(p): """Returns the directory component of a pathname""" return split(p)[0] # alias exists to lexists lexists = exists # Is a path a directory? # Is a path a mount point? Either a root (with or without drive letter) # or a UNC path with at most a / or \ after the mount point. def ismount(path): """Test whether a path is a mount point (defined as root of drive)""" unc, rest = splitunc(path) if unc: return rest in ("", "/", "\\") p = splitdrive(path)[1] return len(p) == 1 and p[0] in '/\\' # Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B. def normpath(path): """Normalize path, eliminating double slashes, etc.""" path = path.replace('\\', '/') prefix, path = splitdrive(path) while path[:1] == '/': prefix = prefix + '/' path = path[1:] comps = path.split('/') i = 0 while i < len(comps): if comps[i] == '.': del comps[i] elif comps[i] == '..' and i > 0 and comps[i-1] not in ('', '..'): del comps[i-1:i+1] i = i - 1 elif comps[i] == '' and i > 0 and comps[i-1] != '': del comps[i] else: i = i + 1 # If the path is now empty, substitute '.' if not prefix and not comps: comps.append('.') return prefix + '/'.join(comps) # Return an absolute path. def abspath(path): """Return the absolute version of a 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 realpath = abspath supports_unicode_filenames = False