422 lines
12 KiB
Python
422 lines
12 KiB
Python
# Module 'ntpath' -- common operations on WinNT/Win95 pathnames
|
|
"""Common pathname manipulations, WindowsNT/95 version.
|
|
|
|
Instead of importing this module directly, import os and refer to this
|
|
module as os.path.
|
|
"""
|
|
|
|
import os
|
|
import stat
|
|
import string
|
|
|
|
|
|
# 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 slashes into backslashes."""
|
|
return string.lower(string.replace(s, "/", "\\"))
|
|
|
|
|
|
# Return whether a path is absolute.
|
|
# Trivial in Posix, harder on the Mac or MS-DOS.
|
|
# For DOS it is absolute if it starts with a slash or backslash (current
|
|
# volume), or if a pathname after the volume letter and colon / UNC resource
|
|
# starts with a slash or backslash.
|
|
|
|
def isabs(s):
|
|
"""Test whether a path is absolute"""
|
|
s = splitdrive(s)[1]
|
|
return s != '' and s[:1] in '/\\'
|
|
|
|
|
|
# Join two (or more) paths.
|
|
|
|
def join(a, *p):
|
|
"""Join two or more pathname components, inserting "\\" 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 + os.sep + b
|
|
return path
|
|
|
|
|
|
# Split a path in a drive specification (a drive letter followed by a
|
|
# colon) and the path specification.
|
|
# It is always true that drivespec + pathspec == p
|
|
def splitdrive(p):
|
|
"""Split a pathname into drive and path specifiers. Returns a 2-tuple
|
|
"(drive,path)"; either part may be empty"""
|
|
if p[1:2] == ':':
|
|
return p[0:2], p[2:]
|
|
return '', p
|
|
|
|
|
|
# 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 == '//' or firstTwo == '\\\\':
|
|
# is a UNC path:
|
|
# vvvvvvvvvvvvvvvvvvvv equivalent to drive letter
|
|
# \\machine\mountpoint\directories...
|
|
# directory ^^^^^^^^^^^^^^^
|
|
normp = normcase(p)
|
|
index = string.find(normp, '\\', 2)
|
|
if index == -1:
|
|
##raise RuntimeError, 'illegal UNC path: "' + p + '"'
|
|
return ("", p)
|
|
index = string.find(normp, '\\', index + 1)
|
|
if index == -1:
|
|
index = len(p)
|
|
return p[:index], p[index:]
|
|
return '', p
|
|
|
|
|
|
# Split a path in head (everything up to the last '/') and tail (the
|
|
# rest). After the trailing '/' is stripped, the invariant
|
|
# join(head, tail) == p holds.
|
|
# The resulting head won't end in '/' unless it is the root.
|
|
|
|
def split(p):
|
|
"""Split a pathname.
|
|
|
|
Return tuple (head, tail) where tail is everything after the final slash.
|
|
Either part may be empty."""
|
|
|
|
d, p = splitdrive(p)
|
|
# set i to index beyond p's last slash
|
|
i = len(p)
|
|
while i and p[i-1] not in '/\\':
|
|
i = i - 1
|
|
head, tail = p[:i], p[i:] # now tail has no slashes
|
|
# remove trailing slashes from head, unless it's all slashes
|
|
head2 = head
|
|
while head2 and head2[-1] in '/\\':
|
|
head2 = head2[:-1]
|
|
head = head2 or head
|
|
return d + head, tail
|
|
|
|
|
|
# Split a path in root and extension.
|
|
# The extension is everything starting at the last dot in the last
|
|
# pathname component; the root is everything before that.
|
|
# It is always true that root + ext == p.
|
|
|
|
def splitext(p):
|
|
"""Split the extension from a pathname.
|
|
|
|
Extension is everything from the last dot to the end.
|
|
Return (root, ext), either part may be empty."""
|
|
root, ext = '', ''
|
|
for c in p:
|
|
if c in ['/','\\']:
|
|
root, ext = root + ext + c, ''
|
|
elif c == '.':
|
|
if ext:
|
|
root, ext = root + ext, c
|
|
else:
|
|
ext = c
|
|
elif ext:
|
|
ext = ext + c
|
|
else:
|
|
root = root + c
|
|
return root, ext
|
|
|
|
|
|
# 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]
|
|
|
|
|
|
# Return the longest prefix of all list elements.
|
|
|
|
def commonprefix(m):
|
|
"Given a list of pathnames, returns the longest common leading component"
|
|
if not m: return ''
|
|
n = m[:]
|
|
for i in range(len(n)):
|
|
n[i] = n[i].split(os.sep)
|
|
prefix = n[0]
|
|
for item in n:
|
|
for i in range(len(prefix)):
|
|
if prefix[:i+1] <> item[:i+1]:
|
|
prefix = prefix[:i]
|
|
if i == 0: return ''
|
|
break
|
|
return os.sep.join(prefix)
|
|
|
|
|
|
# Get size, mtime, atime of files.
|
|
|
|
def getsize(filename):
|
|
"""Return the size of a file, reported by os.stat()"""
|
|
st = os.stat(filename)
|
|
return st[stat.ST_SIZE]
|
|
|
|
def getmtime(filename):
|
|
"""Return the last modification time of a file, reported by os.stat()"""
|
|
st = os.stat(filename)
|
|
return st[stat.ST_MTIME]
|
|
|
|
def getatime(filename):
|
|
"""Return the last access time of a file, reported by os.stat()"""
|
|
st = os.stat(filename)
|
|
return st[stat.ST_ATIME]
|
|
|
|
|
|
# Is a path a symbolic link?
|
|
# This will always return false on systems where posix.lstat doesn't exist.
|
|
|
|
def islink(path):
|
|
"""Test for symbolic link. On WindowsNT/95 always returns false"""
|
|
return 0
|
|
|
|
|
|
# Does a path exist?
|
|
# This is false for dangling symbolic links.
|
|
|
|
def exists(path):
|
|
"""Test whether a path exists"""
|
|
try:
|
|
st = os.stat(path)
|
|
except os.error:
|
|
return 0
|
|
return 1
|
|
|
|
|
|
# Is a path a dos directory?
|
|
# This follows symbolic links, so both islink() and isdir() can be true
|
|
# for the same path.
|
|
|
|
def isdir(path):
|
|
"""Test whether a path is a directory"""
|
|
try:
|
|
st = os.stat(path)
|
|
except os.error:
|
|
return 0
|
|
return stat.S_ISDIR(st[stat.ST_MODE])
|
|
|
|
|
|
# Is a path a regular file?
|
|
# This follows symbolic links, so both islink() and isdir() can be true
|
|
# for the same path.
|
|
|
|
def isfile(path):
|
|
"""Test whether a path is a regular file"""
|
|
try:
|
|
st = os.stat(path)
|
|
except os.error:
|
|
return 0
|
|
return stat.S_ISREG(st[stat.ST_MODE])
|
|
|
|
|
|
# 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 '/\\'
|
|
|
|
|
|
# Directory tree walk.
|
|
# For each directory under top (including top itself, but excluding
|
|
# '.' and '..'), func(arg, dirname, filenames) is called, where
|
|
# dirname is the name of the directory and filenames is the list
|
|
# files files (and subdirectories etc.) in the directory.
|
|
# The func may modify the filenames list, to implement a filter,
|
|
# or to impose a different order of visiting.
|
|
|
|
def walk(top, func, arg):
|
|
"""Directory tree walk whth callback function.
|
|
|
|
walk(top, func, arg) calls func(arg, d, files) for each directory d
|
|
in the tree rooted at top (including top itself); files is a list
|
|
of all the files and subdirs in directory d."""
|
|
try:
|
|
names = os.listdir(top)
|
|
except os.error:
|
|
return
|
|
func(arg, top, names)
|
|
exceptions = ('.', '..')
|
|
for name in names:
|
|
if name not in exceptions:
|
|
name = join(top, name)
|
|
if isdir(name):
|
|
walk(name, func, arg)
|
|
|
|
|
|
# Expand paths beginning with '~' or '~user'.
|
|
# '~' means $HOME; '~user' means that user's home directory.
|
|
# If the path doesn't begin with '~', or if the user or $HOME is unknown,
|
|
# the path is returned unchanged (leaving error reporting to whatever
|
|
# function is called with the expanded path as argument).
|
|
# See also module 'glob' for expansion of *, ? and [...] in pathnames.
|
|
# (A function should also be defined to do full *sh-style environment
|
|
# variable expansion.)
|
|
|
|
def expanduser(path):
|
|
"""Expand ~ and ~user constructs.
|
|
|
|
If user or $HOME is unknown, do nothing."""
|
|
if path[:1] <> '~':
|
|
return path
|
|
i, n = 1, len(path)
|
|
while i < n and path[i] not in '/\\':
|
|
i = i+1
|
|
if i == 1:
|
|
if os.environ.has_key('HOME'):
|
|
userhome = os.environ['HOME']
|
|
elif not os.environ.has_key('HOMEPATH'):
|
|
return path
|
|
else:
|
|
try:
|
|
drive=os.environ['HOMEDRIVE']
|
|
except KeyError:
|
|
drive = ''
|
|
userhome = join(drive, os.environ['HOMEPATH'])
|
|
else:
|
|
return path
|
|
return userhome + path[i:]
|
|
|
|
|
|
# Expand paths containing shell variable substitutions.
|
|
# The following rules apply:
|
|
# - no expansion within single quotes
|
|
# - no escape character, except for '$$' which is translated into '$'
|
|
# - ${varname} is accepted.
|
|
# - varnames can be made out of letters, digits and the character '_'
|
|
# XXX With COMMAND.COM you can use any characters in a variable name,
|
|
# XXX except '^|<>='.
|
|
|
|
varchars = string.letters + string.digits + '_-'
|
|
|
|
def expandvars(path):
|
|
"""Expand shell variables of form $var and ${var}.
|
|
|
|
Unknown variables are left unchanged."""
|
|
if '$' not in path:
|
|
return path
|
|
res = ''
|
|
index = 0
|
|
pathlen = len(path)
|
|
while index < pathlen:
|
|
c = path[index]
|
|
if c == '\'': # no expansion within single quotes
|
|
path = path[index + 1:]
|
|
pathlen = len(path)
|
|
try:
|
|
index = string.index(path, '\'')
|
|
res = res + '\'' + path[:index + 1]
|
|
except string.index_error:
|
|
res = res + path
|
|
index = pathlen -1
|
|
elif c == '$': # variable or '$$'
|
|
if path[index + 1:index + 2] == '$':
|
|
res = res + c
|
|
index = index + 1
|
|
elif path[index + 1:index + 2] == '{':
|
|
path = path[index+2:]
|
|
pathlen = len(path)
|
|
try:
|
|
index = string.index(path, '}')
|
|
var = path[:index]
|
|
if os.environ.has_key(var):
|
|
res = res + os.environ[var]
|
|
except string.index_error:
|
|
res = res + path
|
|
index = pathlen - 1
|
|
else:
|
|
var = ''
|
|
index = index + 1
|
|
c = path[index:index + 1]
|
|
while c != '' and c in varchars:
|
|
var = var + c
|
|
index = index + 1
|
|
c = path[index:index + 1]
|
|
if os.environ.has_key(var):
|
|
res = res + os.environ[var]
|
|
if c != '':
|
|
res = res + c
|
|
else:
|
|
res = res + c
|
|
index = index + 1
|
|
return res
|
|
|
|
|
|
# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B.
|
|
# Previously, this function also truncated pathnames to 8+3 format,
|
|
# but as this module is called "ntpath", that's obviously wrong!
|
|
|
|
def normpath(path):
|
|
"""Normalize path, eliminating double slashes, etc."""
|
|
path = string.replace(path, "/", "\\")
|
|
prefix, path = splitdrive(path)
|
|
while path[:1] == os.sep:
|
|
prefix = prefix + os.sep
|
|
path = path[1:]
|
|
comps = string.splitfields(path, os.sep)
|
|
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 + string.joinfields(comps, os.sep)
|
|
|
|
|
|
# Return an absolute path.
|
|
def abspath(path):
|
|
"""Return the absolute version of a path"""
|
|
try:
|
|
import win32api
|
|
except ImportError:
|
|
global abspath
|
|
def _abspath(path):
|
|
if not isabs(path):
|
|
path = join(os.getcwd(), path)
|
|
return normpath(path)
|
|
abspath = _abspath
|
|
return _abspath(path)
|
|
try:
|
|
path = win32api.GetFullPathName(path)
|
|
except win32api.error:
|
|
pass # Bad path - return unchanged.
|
|
return normpath(path)
|