| Current File : //lib64/python2.7/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 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 an 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 an 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