665 lines
22 KiB
Python
665 lines
22 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 sys
|
|
import stat
|
|
import genericpath
|
|
from genericpath import *
|
|
|
|
__all__ = ["normcase","isabs","join","splitdrive","split","splitext",
|
|
"basename","dirname","commonprefix","getsize","getmtime",
|
|
"getatime","getctime", "islink","exists","lexists","isdir","isfile",
|
|
"ismount", "expanduser","expandvars","normpath","abspath",
|
|
"splitunc","curdir","pardir","sep","pathsep","defpath","altsep",
|
|
"extsep","devnull","realpath","supports_unicode_filenames","relpath",
|
|
"samefile", "sameopenfile",]
|
|
|
|
# strings representing various path-related bits and pieces
|
|
# These are primarily for export; internally, they are hardcoded.
|
|
curdir = '.'
|
|
pardir = '..'
|
|
extsep = '.'
|
|
sep = '\\'
|
|
pathsep = ';'
|
|
altsep = '/'
|
|
defpath = '.;C:\\bin'
|
|
if 'ce' in sys.builtin_module_names:
|
|
defpath = '\\Windows'
|
|
elif 'os2' in sys.builtin_module_names:
|
|
# OS/2 w/ VACPP
|
|
altsep = '/'
|
|
devnull = 'nul'
|
|
|
|
def _get_empty(path):
|
|
if isinstance(path, bytes):
|
|
return b''
|
|
else:
|
|
return ''
|
|
|
|
def _get_sep(path):
|
|
if isinstance(path, bytes):
|
|
return b'\\'
|
|
else:
|
|
return '\\'
|
|
|
|
def _get_altsep(path):
|
|
if isinstance(path, bytes):
|
|
return b'/'
|
|
else:
|
|
return '/'
|
|
|
|
def _get_bothseps(path):
|
|
if isinstance(path, bytes):
|
|
return b'\\/'
|
|
else:
|
|
return '\\/'
|
|
|
|
def _get_dot(path):
|
|
if isinstance(path, bytes):
|
|
return b'.'
|
|
else:
|
|
return '.'
|
|
|
|
def _get_colon(path):
|
|
if isinstance(path, bytes):
|
|
return b':'
|
|
else:
|
|
return ':'
|
|
|
|
def _get_special(path):
|
|
if isinstance(path, bytes):
|
|
return (b'\\\\.\\', b'\\\\?\\')
|
|
else:
|
|
return ('\\\\.\\', '\\\\?\\')
|
|
|
|
# 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."""
|
|
if not isinstance(s, (bytes, str)):
|
|
raise TypeError("normcase() argument must be str or bytes, "
|
|
"not '{}'".format(s.__class__.__name__))
|
|
return s.replace(_get_altsep(s), _get_sep(s)).lower()
|
|
|
|
|
|
# Return whether a path is absolute.
|
|
# Trivial in Posix, harder on Windows.
|
|
# For Windows it is absolute if it starts with a slash or backslash (current
|
|
# volume), or if a pathname after the volume-letter-and-colon or UNC-resource
|
|
# starts with a slash or backslash.
|
|
|
|
def isabs(s):
|
|
"""Test whether a path is absolute"""
|
|
s = splitdrive(s)[1]
|
|
return len(s) > 0 and s[:1] in _get_bothseps(s)
|
|
|
|
|
|
# Join two (or more) paths.
|
|
|
|
def join(a, *p):
|
|
"""Join two or more pathname components, inserting "\\" as needed.
|
|
If any component is an absolute path, all previous path components
|
|
will be discarded."""
|
|
sep = _get_sep(a)
|
|
seps = _get_bothseps(a)
|
|
colon = _get_colon(a)
|
|
path = a
|
|
for b in p:
|
|
b_wins = 0 # set to 1 iff b makes path irrelevant
|
|
if not path:
|
|
b_wins = 1
|
|
|
|
elif isabs(b):
|
|
# This probably wipes out path so far. However, it's more
|
|
# complicated if path begins with a drive letter. You get a+b
|
|
# (minus redundant slashes) in these four cases:
|
|
# 1. join('c:', '/a') == 'c:/a'
|
|
# 2. join('//computer/share', '/a') == '//computer/share/a'
|
|
# 3. join('c:/', '/a') == 'c:/a'
|
|
# 4. join('//computer/share/', '/a') == '//computer/share/a'
|
|
# But b wins in all of these cases:
|
|
# 5. join('c:/a', '/b') == '/b'
|
|
# 6. join('//computer/share/a', '/b') == '/b'
|
|
# 7. join('c:', 'd:/') == 'd:/'
|
|
# 8. join('c:', '//computer/share/') == '//computer/share/'
|
|
# 9. join('//computer/share', 'd:/') == 'd:/'
|
|
# 10. join('//computer/share', '//computer/share/') == '//computer/share/'
|
|
# 11. join('c:/', 'd:/') == 'd:/'
|
|
# 12. join('c:/', '//computer/share/') == '//computer/share/'
|
|
# 13. join('//computer/share/', 'd:/') == 'd:/'
|
|
# 14. join('//computer/share/', '//computer/share/') == '//computer/share/'
|
|
b_prefix, b_rest = splitdrive(b)
|
|
|
|
# if b has a prefix, it always wins.
|
|
if b_prefix:
|
|
b_wins = 1
|
|
else:
|
|
# b doesn't have a prefix.
|
|
# but isabs(b) returned true.
|
|
# and therefore b_rest[0] must be a slash.
|
|
# (but let's check that.)
|
|
assert(b_rest and b_rest[0] in seps)
|
|
|
|
# so, b still wins if path has a rest that's more than a sep.
|
|
# you get a+b if path_rest is empty or only has a sep.
|
|
# (see cases 1-4 for times when b loses.)
|
|
path_rest = splitdrive(path)[1]
|
|
b_wins = path_rest and path_rest not in seps
|
|
|
|
if b_wins:
|
|
path = b
|
|
else:
|
|
# Join, and ensure there's a separator.
|
|
assert len(path) > 0
|
|
if path[-1:] in seps:
|
|
if b and b[:1] in seps:
|
|
path += b[1:]
|
|
else:
|
|
path += b
|
|
elif path[-1:] == colon:
|
|
path += b
|
|
elif b:
|
|
if b[:1] in seps:
|
|
path += b
|
|
else:
|
|
path += sep + b
|
|
else:
|
|
# path is not empty and does not end with a backslash,
|
|
# but b is empty; since, e.g., split('a/') produces
|
|
# ('a', ''), it's best if join() adds a backslash in
|
|
# this case.
|
|
path += sep
|
|
|
|
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/UNC sharepoint and relative path specifiers.
|
|
Returns a 2-tuple (drive_or_unc, path); either part may be empty.
|
|
|
|
If you assign
|
|
result = splitdrive(p)
|
|
It is always true that:
|
|
result[0] + result[1] == p
|
|
|
|
If the path contained a drive letter, drive_or_unc will contain everything
|
|
up to and including the colon. e.g. splitdrive("c:/dir") returns ("c:", "/dir")
|
|
|
|
If the path contained a UNC path, the drive_or_unc will contain the host name
|
|
and share up to but not including the fourth directory separator character.
|
|
e.g. splitdrive("//host/computer/dir") returns ("//host/computer", "/dir")
|
|
|
|
Paths cannot contain both a drive letter and a UNC path.
|
|
|
|
"""
|
|
empty = _get_empty(p)
|
|
if len(p) > 1:
|
|
sep = _get_sep(p)
|
|
normp = normcase(p)
|
|
if (normp[0:2] == sep*2) and (normp[2:3] != sep):
|
|
# is a UNC path:
|
|
# vvvvvvvvvvvvvvvvvvvv drive letter or UNC path
|
|
# \\machine\mountpoint\directory\etc\...
|
|
# directory ^^^^^^^^^^^^^^^
|
|
index = normp.find(sep, 2)
|
|
if index == -1:
|
|
return empty, p
|
|
index2 = normp.find(sep, index + 1)
|
|
# a UNC path can't have two slashes in a row
|
|
# (after the initial two)
|
|
if index2 == index + 1:
|
|
return empty, p
|
|
if index2 == -1:
|
|
index2 = len(p)
|
|
return p[:index2], p[index2:]
|
|
if normp[1:2] == _get_colon(p):
|
|
return p[:2], p[2:]
|
|
return empty, p
|
|
|
|
|
|
# Parse UNC paths
|
|
def splitunc(p):
|
|
"""Deprecated since Python 3.1. Please use splitdrive() instead;
|
|
it now handles UNC paths.
|
|
|
|
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.
|
|
"""
|
|
import warnings
|
|
warnings.warn("ntpath.splitunc is deprecated, use ntpath.splitdrive instead",
|
|
DeprecationWarning)
|
|
sep = _get_sep(p)
|
|
if not p[1:2]:
|
|
return p[:0], p # Drive letter present
|
|
firstTwo = p[0:2]
|
|
if normcase(firstTwo) == sep + sep:
|
|
# is a UNC path:
|
|
# vvvvvvvvvvvvvvvvvvvv equivalent to drive letter
|
|
# \\machine\mountpoint\directories...
|
|
# directory ^^^^^^^^^^^^^^^
|
|
normp = normcase(p)
|
|
index = normp.find(sep, 2)
|
|
if index == -1:
|
|
##raise RuntimeError, 'illegal UNC path: "' + p + '"'
|
|
return (p[:0], p)
|
|
index = normp.find(sep, index + 1)
|
|
if index == -1:
|
|
index = len(p)
|
|
return p[:index], p[index:]
|
|
return p[:0], 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."""
|
|
|
|
seps = _get_bothseps(p)
|
|
d, p = splitdrive(p)
|
|
# set i to index beyond p's last slash
|
|
i = len(p)
|
|
while i and p[i-1] not in seps:
|
|
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 seps:
|
|
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):
|
|
return genericpath._splitext(p, _get_sep(p), _get_altsep(p),
|
|
_get_dot(p))
|
|
splitext.__doc__ = genericpath._splitext.__doc__
|
|
|
|
|
|
# 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]
|
|
|
|
# Is a path a symbolic link?
|
|
# This will always return false on systems where os.lstat doesn't exist.
|
|
|
|
def islink(path):
|
|
"""Test whether a path is a symbolic link.
|
|
This will always return false for Windows prior to 6.0
|
|
and for OS/2.
|
|
"""
|
|
try:
|
|
st = os.lstat(path)
|
|
except (os.error, AttributeError):
|
|
return False
|
|
return stat.S_ISLNK(st.st_mode)
|
|
|
|
# Being true for dangling symbolic links is also useful.
|
|
|
|
def lexists(path):
|
|
"""Test whether a path exists. Returns True for broken symbolic links"""
|
|
try:
|
|
st = os.lstat(path)
|
|
except (os.error, WindowsError):
|
|
return False
|
|
return True
|
|
|
|
# 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)"""
|
|
seps = _get_bothseps(path)
|
|
root, rest = splitdrive(path)
|
|
if root and root[0] in seps:
|
|
return (not rest) or (rest in seps)
|
|
return rest in seps
|
|
|
|
|
|
# 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 isinstance(path, bytes):
|
|
tilde = b'~'
|
|
else:
|
|
tilde = '~'
|
|
if not path.startswith(tilde):
|
|
return path
|
|
i, n = 1, len(path)
|
|
while i < n and path[i] not in _get_bothseps(path):
|
|
i += 1
|
|
|
|
if 'HOME' in os.environ:
|
|
userhome = os.environ['HOME']
|
|
elif 'USERPROFILE' in os.environ:
|
|
userhome = os.environ['USERPROFILE']
|
|
elif not 'HOMEPATH' in os.environ:
|
|
return path
|
|
else:
|
|
try:
|
|
drive = os.environ['HOMEDRIVE']
|
|
except KeyError:
|
|
drive = ''
|
|
userhome = join(drive, os.environ['HOMEPATH'])
|
|
|
|
if isinstance(path, bytes):
|
|
userhome = userhome.encode(sys.getfilesystemencoding())
|
|
|
|
if i != 1: #~user
|
|
userhome = join(dirname(userhome), path[1:i])
|
|
|
|
return userhome + path[i:]
|
|
|
|
|
|
# Expand paths containing shell variable substitutions.
|
|
# The following rules apply:
|
|
# - no expansion within single quotes
|
|
# - '$$' is translated into '$'
|
|
# - '%%' is translated into '%' if '%%' are not seen in %var1%%var2%
|
|
# - ${varname} is accepted.
|
|
# - $varname is accepted.
|
|
# - %varname% is accepted.
|
|
# - varnames can be made out of letters, digits and the characters '_-'
|
|
# (though is not verifed in the ${varname} and %varname% cases)
|
|
# XXX With COMMAND.COM you can use any characters in a variable name,
|
|
# XXX except '^|<>='.
|
|
|
|
def expandvars(path):
|
|
"""Expand shell variables of the forms $var, ${var} and %var%.
|
|
|
|
Unknown variables are left unchanged."""
|
|
if isinstance(path, bytes):
|
|
if ord('$') not in path and ord('%') not in path:
|
|
return path
|
|
import string
|
|
varchars = bytes(string.ascii_letters + string.digits + '_-', 'ascii')
|
|
quote = b'\''
|
|
percent = b'%'
|
|
brace = b'{'
|
|
dollar = b'$'
|
|
else:
|
|
if '$' not in path and '%' not in path:
|
|
return path
|
|
import string
|
|
varchars = string.ascii_letters + string.digits + '_-'
|
|
quote = '\''
|
|
percent = '%'
|
|
brace = '{'
|
|
dollar = '$'
|
|
res = path[:0]
|
|
index = 0
|
|
pathlen = len(path)
|
|
while index < pathlen:
|
|
c = path[index:index+1]
|
|
if c == quote: # no expansion within single quotes
|
|
path = path[index + 1:]
|
|
pathlen = len(path)
|
|
try:
|
|
index = path.index(c)
|
|
res += c + path[:index + 1]
|
|
except ValueError:
|
|
res += path
|
|
index = pathlen - 1
|
|
elif c == percent: # variable or '%'
|
|
if path[index + 1:index + 2] == percent:
|
|
res += c
|
|
index += 1
|
|
else:
|
|
path = path[index+1:]
|
|
pathlen = len(path)
|
|
try:
|
|
index = path.index(percent)
|
|
except ValueError:
|
|
res += percent + path
|
|
index = pathlen - 1
|
|
else:
|
|
var = path[:index]
|
|
if isinstance(path, bytes):
|
|
var = var.decode('ascii')
|
|
if var in os.environ:
|
|
value = os.environ[var]
|
|
else:
|
|
value = '%' + var + '%'
|
|
if isinstance(path, bytes):
|
|
value = value.encode('ascii')
|
|
res += value
|
|
elif c == dollar: # variable or '$$'
|
|
if path[index + 1:index + 2] == dollar:
|
|
res += c
|
|
index += 1
|
|
elif path[index + 1:index + 2] == brace:
|
|
path = path[index+2:]
|
|
pathlen = len(path)
|
|
try:
|
|
if isinstance(path, bytes):
|
|
index = path.index(b'}')
|
|
else:
|
|
index = path.index('}')
|
|
var = path[:index]
|
|
if isinstance(path, bytes):
|
|
var = var.decode('ascii')
|
|
if var in os.environ:
|
|
value = os.environ[var]
|
|
else:
|
|
value = '${' + var + '}'
|
|
if isinstance(path, bytes):
|
|
value = value.encode('ascii')
|
|
res += value
|
|
except ValueError:
|
|
if isinstance(path, bytes):
|
|
res += b'${' + path
|
|
else:
|
|
res += '${' + path
|
|
index = pathlen - 1
|
|
else:
|
|
var = ''
|
|
index += 1
|
|
c = path[index:index + 1]
|
|
while c and c in varchars:
|
|
if isinstance(path, bytes):
|
|
var += c.decode('ascii')
|
|
else:
|
|
var += c
|
|
index += 1
|
|
c = path[index:index + 1]
|
|
if var in os.environ:
|
|
value = os.environ[var]
|
|
else:
|
|
value = '$' + var
|
|
if isinstance(path, bytes):
|
|
value = value.encode('ascii')
|
|
res += value
|
|
if c:
|
|
index -= 1
|
|
else:
|
|
res += c
|
|
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."""
|
|
sep = _get_sep(path)
|
|
dotdot = _get_dot(path) * 2
|
|
special_prefixes = _get_special(path)
|
|
if path.startswith(special_prefixes):
|
|
# in the case of paths with these prefixes:
|
|
# \\.\ -> device names
|
|
# \\?\ -> literal paths
|
|
# do not do any normalization, but return the path unchanged
|
|
return path
|
|
path = path.replace(_get_altsep(path), sep)
|
|
prefix, path = splitdrive(path)
|
|
|
|
# collapse initial backslashes
|
|
if path.startswith(sep):
|
|
prefix += sep
|
|
path = path.lstrip(sep)
|
|
|
|
comps = path.split(sep)
|
|
i = 0
|
|
while i < len(comps):
|
|
if not comps[i] or comps[i] == _get_dot(path):
|
|
del comps[i]
|
|
elif comps[i] == dotdot:
|
|
if i > 0 and comps[i-1] != dotdot:
|
|
del comps[i-1:i+1]
|
|
i -= 1
|
|
elif i == 0 and prefix.endswith(_get_sep(path)):
|
|
del comps[i]
|
|
else:
|
|
i += 1
|
|
else:
|
|
i += 1
|
|
# If the path is now empty, substitute '.'
|
|
if not prefix and not comps:
|
|
comps.append(_get_dot(path))
|
|
return prefix + sep.join(comps)
|
|
|
|
|
|
# Return an absolute path.
|
|
try:
|
|
from nt import _getfullpathname
|
|
|
|
except ImportError: # not running on Windows - mock up something sensible
|
|
def abspath(path):
|
|
"""Return the absolute version of a path."""
|
|
if not isabs(path):
|
|
if isinstance(path, bytes):
|
|
cwd = os.getcwdb()
|
|
else:
|
|
cwd = os.getcwd()
|
|
path = join(cwd, path)
|
|
return normpath(path)
|
|
|
|
else: # use native Windows method on Windows
|
|
def abspath(path):
|
|
"""Return the absolute version of a path."""
|
|
|
|
if path: # Empty path must return current working directory.
|
|
try:
|
|
path = _getfullpathname(path)
|
|
except WindowsError:
|
|
pass # Bad path - return unchanged.
|
|
elif isinstance(path, bytes):
|
|
path = os.getcwdb()
|
|
else:
|
|
path = os.getcwd()
|
|
return normpath(path)
|
|
|
|
# realpath is a no-op on systems without islink support
|
|
realpath = abspath
|
|
# Win9x family and earlier have no Unicode filename support.
|
|
supports_unicode_filenames = (hasattr(sys, "getwindowsversion") and
|
|
sys.getwindowsversion()[3] >= 2)
|
|
|
|
def relpath(path, start=curdir):
|
|
"""Return a relative version of a path"""
|
|
sep = _get_sep(path)
|
|
|
|
if start is curdir:
|
|
start = _get_dot(path)
|
|
|
|
if not path:
|
|
raise ValueError("no path specified")
|
|
|
|
start_abs = abspath(normpath(start))
|
|
path_abs = abspath(normpath(path))
|
|
start_drive, start_rest = splitdrive(start_abs)
|
|
path_drive, path_rest = splitdrive(path_abs)
|
|
if start_drive != path_drive:
|
|
error = "path is on mount '{0}', start on mount '{1}'".format(
|
|
path_drive, start_drive)
|
|
raise ValueError(error)
|
|
|
|
start_list = [x for x in start_rest.split(sep) if x]
|
|
path_list = [x for x in path_rest.split(sep) if x]
|
|
# Work out how much of the filepath is shared by start and path.
|
|
i = 0
|
|
for e1, e2 in zip(start_list, path_list):
|
|
if e1 != e2:
|
|
break
|
|
i += 1
|
|
|
|
if isinstance(path, bytes):
|
|
pardir = b'..'
|
|
else:
|
|
pardir = '..'
|
|
rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
|
|
if not rel_list:
|
|
return _get_dot(path)
|
|
return join(*rel_list)
|
|
|
|
|
|
# determine if two files are in fact the same file
|
|
def samefile(f1, f2):
|
|
"Test whether two pathnames reference the same actual file"
|
|
try:
|
|
from nt import _getfinalpathname
|
|
return _getfinalpathname(f1) == _getfinalpathname(f2)
|
|
except (NotImplementedError, ImportError):
|
|
# On Windows XP and earlier, two files are the same if their
|
|
# absolute pathnames are the same.
|
|
# Also, on other operating systems, fake this method with a
|
|
# Windows-XP approximation.
|
|
return abspath(f1) == abspath(f2)
|
|
|
|
def sameopenfile(f1, f2):
|
|
"""Test whether two file objects reference the same file"""
|
|
try:
|
|
from nt import _getfileinformation
|
|
return _getfileinformation(f1) == _getfileinformation(f2)
|
|
except ImportError:
|
|
# On other operating systems, return True if the file descriptors
|
|
# are the same.
|
|
return f1 == f2
|