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675 lines
22 KiB
Python
675 lines
22 KiB
Python
# Module 'ntpath' -- common operations on WinNT/Win95 pathnames
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"""Common pathname manipulations, WindowsNT/95 version.
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Instead of importing this module directly, import os and refer to this
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module as os.path.
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"""
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import os
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import sys
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import stat
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import genericpath
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from genericpath import *
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__all__ = ["normcase","isabs","join","splitdrive","split","splitext",
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"basename","dirname","commonprefix","getsize","getmtime",
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"getatime","getctime", "islink","exists","lexists","isdir","isfile",
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"ismount", "expanduser","expandvars","normpath","abspath",
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"splitunc","curdir","pardir","sep","pathsep","defpath","altsep",
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"extsep","devnull","realpath","supports_unicode_filenames","relpath",
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"samefile", "sameopenfile",]
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# strings representing various path-related bits and pieces
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# These are primarily for export; internally, they are hardcoded.
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curdir = '.'
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pardir = '..'
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extsep = '.'
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sep = '\\'
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pathsep = ';'
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altsep = '/'
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defpath = '.;C:\\bin'
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if 'ce' in sys.builtin_module_names:
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defpath = '\\Windows'
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elif 'os2' in sys.builtin_module_names:
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# OS/2 w/ VACPP
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altsep = '/'
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devnull = 'nul'
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def _get_empty(path):
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if isinstance(path, bytes):
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return b''
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else:
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return ''
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def _get_sep(path):
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if isinstance(path, bytes):
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return b'\\'
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else:
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return '\\'
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def _get_altsep(path):
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if isinstance(path, bytes):
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return b'/'
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else:
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return '/'
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def _get_bothseps(path):
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if isinstance(path, bytes):
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return b'\\/'
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else:
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return '\\/'
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def _get_dot(path):
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if isinstance(path, bytes):
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return b'.'
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else:
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return '.'
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def _get_colon(path):
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if isinstance(path, bytes):
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return b':'
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else:
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return ':'
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def _get_special(path):
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if isinstance(path, bytes):
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return (b'\\\\.\\', b'\\\\?\\')
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else:
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return ('\\\\.\\', '\\\\?\\')
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# Normalize the case of a pathname and map slashes to backslashes.
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# Other normalizations (such as optimizing '../' away) are not done
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# (this is done by normpath).
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def normcase(s):
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"""Normalize case of pathname.
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Makes all characters lowercase and all slashes into backslashes."""
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if not isinstance(s, (bytes, str)):
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raise TypeError("normcase() argument must be str or bytes, "
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"not '{}'".format(s.__class__.__name__))
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return s.replace(_get_altsep(s), _get_sep(s)).lower()
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# Return whether a path is absolute.
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# Trivial in Posix, harder on Windows.
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# For Windows it is absolute if it starts with a slash or backslash (current
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# volume), or if a pathname after the volume-letter-and-colon or UNC-resource
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# starts with a slash or backslash.
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def isabs(s):
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"""Test whether a path is absolute"""
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s = splitdrive(s)[1]
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return len(s) > 0 and s[:1] in _get_bothseps(s)
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# Join two (or more) paths.
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def join(a, *p):
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"""Join two or more pathname components, inserting "\\" as needed.
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If any component is an absolute path, all previous path components
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will be discarded."""
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sep = _get_sep(a)
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seps = _get_bothseps(a)
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colon = _get_colon(a)
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path = a
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for b in p:
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b_wins = 0 # set to 1 iff b makes path irrelevant
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if not path:
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b_wins = 1
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elif isabs(b):
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# This probably wipes out path so far. However, it's more
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# complicated if path begins with a drive letter. You get a+b
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# (minus redundant slashes) in these four cases:
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# 1. join('c:', '/a') == 'c:/a'
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# 2. join('//computer/share', '/a') == '//computer/share/a'
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# 3. join('c:/', '/a') == 'c:/a'
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# 4. join('//computer/share/', '/a') == '//computer/share/a'
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# But b wins in all of these cases:
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# 5. join('c:/a', '/b') == '/b'
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# 6. join('//computer/share/a', '/b') == '/b'
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# 7. join('c:', 'd:/') == 'd:/'
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# 8. join('c:', '//computer/share/') == '//computer/share/'
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# 9. join('//computer/share', 'd:/') == 'd:/'
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# 10. join('//computer/share', '//computer/share/') == '//computer/share/'
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# 11. join('c:/', 'd:/') == 'd:/'
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# 12. join('c:/', '//computer/share/') == '//computer/share/'
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# 13. join('//computer/share/', 'd:/') == 'd:/'
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# 14. join('//computer/share/', '//computer/share/') == '//computer/share/'
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b_prefix, b_rest = splitdrive(b)
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# if b has a prefix, it always wins.
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if b_prefix:
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b_wins = 1
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else:
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# b doesn't have a prefix.
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# but isabs(b) returned true.
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# and therefore b_rest[0] must be a slash.
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# (but let's check that.)
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assert(b_rest and b_rest[0] in seps)
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# so, b still wins if path has a rest that's more than a sep.
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# you get a+b if path_rest is empty or only has a sep.
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# (see cases 1-4 for times when b loses.)
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path_rest = splitdrive(path)[1]
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b_wins = path_rest and path_rest not in seps
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if b_wins:
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path = b
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else:
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# Join, and ensure there's a separator.
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assert len(path) > 0
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if path[-1:] in seps:
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if b and b[:1] in seps:
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path += b[1:]
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else:
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path += b
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elif path[-1:] == colon:
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path += b
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elif b:
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if b[:1] in seps:
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path += b
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else:
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path += sep + b
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else:
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# path is not empty and does not end with a backslash,
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# but b is empty; since, e.g., split('a/') produces
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# ('a', ''), it's best if join() adds a backslash in
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# this case.
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path += sep
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return path
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# Split a path in a drive specification (a drive letter followed by a
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# colon) and the path specification.
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# It is always true that drivespec + pathspec == p
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def splitdrive(p):
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"""Split a pathname into drive/UNC sharepoint and relative path specifiers.
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Returns a 2-tuple (drive_or_unc, path); either part may be empty.
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If you assign
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result = splitdrive(p)
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It is always true that:
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result[0] + result[1] == p
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If the path contained a drive letter, drive_or_unc will contain everything
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up to and including the colon. e.g. splitdrive("c:/dir") returns ("c:", "/dir")
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If the path contained a UNC path, the drive_or_unc will contain the host name
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and share up to but not including the fourth directory separator character.
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e.g. splitdrive("//host/computer/dir") returns ("//host/computer", "/dir")
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Paths cannot contain both a drive letter and a UNC path.
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"""
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empty = _get_empty(p)
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if len(p) > 1:
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sep = _get_sep(p)
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normp = normcase(p)
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if (normp[0:2] == sep*2) and (normp[2:3] != sep):
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# is a UNC path:
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# vvvvvvvvvvvvvvvvvvvv drive letter or UNC path
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# \\machine\mountpoint\directory\etc\...
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# directory ^^^^^^^^^^^^^^^
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index = normp.find(sep, 2)
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if index == -1:
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return empty, p
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index2 = normp.find(sep, index + 1)
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# a UNC path can't have two slashes in a row
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# (after the initial two)
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if index2 == index + 1:
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return empty, p
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if index2 == -1:
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index2 = len(p)
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return p[:index2], p[index2:]
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if normp[1:2] == _get_colon(p):
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return p[:2], p[2:]
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return empty, p
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# Parse UNC paths
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def splitunc(p):
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"""Deprecated since Python 3.1. Please use splitdrive() instead;
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it now handles UNC paths.
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Split a pathname into UNC mount point and relative path specifiers.
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Return a 2-tuple (unc, rest); either part may be empty.
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If unc is not empty, it has the form '//host/mount' (or similar
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using backslashes). unc+rest is always the input path.
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Paths containing drive letters never have an UNC part.
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"""
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import warnings
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warnings.warn("ntpath.splitunc is deprecated, use ntpath.splitdrive instead",
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DeprecationWarning)
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sep = _get_sep(p)
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if not p[1:2]:
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return p[:0], p # Drive letter present
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firstTwo = p[0:2]
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if normcase(firstTwo) == sep + sep:
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# is a UNC path:
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# vvvvvvvvvvvvvvvvvvvv equivalent to drive letter
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# \\machine\mountpoint\directories...
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# directory ^^^^^^^^^^^^^^^
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normp = normcase(p)
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index = normp.find(sep, 2)
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if index == -1:
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##raise RuntimeError, 'illegal UNC path: "' + p + '"'
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return (p[:0], p)
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index = normp.find(sep, index + 1)
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if index == -1:
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index = len(p)
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return p[:index], p[index:]
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return p[:0], p
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# Split a path in head (everything up to the last '/') and tail (the
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# rest). After the trailing '/' is stripped, the invariant
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# join(head, tail) == p holds.
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# The resulting head won't end in '/' unless it is the root.
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def split(p):
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"""Split a pathname.
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Return tuple (head, tail) where tail is everything after the final slash.
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Either part may be empty."""
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seps = _get_bothseps(p)
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d, p = splitdrive(p)
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# set i to index beyond p's last slash
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i = len(p)
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while i and p[i-1] not in seps:
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i -= 1
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head, tail = p[:i], p[i:] # now tail has no slashes
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# remove trailing slashes from head, unless it's all slashes
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head2 = head
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while head2 and head2[-1:] in seps:
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head2 = head2[:-1]
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head = head2 or head
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return d + head, tail
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# Split a path in root and extension.
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# The extension is everything starting at the last dot in the last
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# pathname component; the root is everything before that.
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# It is always true that root + ext == p.
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def splitext(p):
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return genericpath._splitext(p, _get_sep(p), _get_altsep(p),
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_get_dot(p))
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splitext.__doc__ = genericpath._splitext.__doc__
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# Return the tail (basename) part of a path.
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def basename(p):
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"""Returns the final component of a pathname"""
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return split(p)[1]
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# Return the head (dirname) part of a path.
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def dirname(p):
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"""Returns the directory component of a pathname"""
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return split(p)[0]
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# Is a path a symbolic link?
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# This will always return false on systems where os.lstat doesn't exist.
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def islink(path):
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"""Test whether a path is a symbolic link.
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This will always return false for Windows prior to 6.0
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and for OS/2.
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"""
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try:
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st = os.lstat(path)
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except (os.error, AttributeError):
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return False
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return stat.S_ISLNK(st.st_mode)
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# Being true for dangling symbolic links is also useful.
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def lexists(path):
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"""Test whether a path exists. Returns True for broken symbolic links"""
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try:
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st = os.lstat(path)
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except (os.error, WindowsError):
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return False
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return True
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# Is a path a mount point? Either a root (with or without drive letter)
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# or an UNC path with at most a / or \ after the mount point.
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def ismount(path):
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"""Test whether a path is a mount point (defined as root of drive)"""
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seps = _get_bothseps(path)
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root, rest = splitdrive(path)
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if root and root[0] in seps:
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return (not rest) or (rest in seps)
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return rest in seps
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# Expand paths beginning with '~' or '~user'.
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# '~' means $HOME; '~user' means that user's home directory.
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# If the path doesn't begin with '~', or if the user or $HOME is unknown,
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# the path is returned unchanged (leaving error reporting to whatever
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# function is called with the expanded path as argument).
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# See also module 'glob' for expansion of *, ? and [...] in pathnames.
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# (A function should also be defined to do full *sh-style environment
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# variable expansion.)
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def expanduser(path):
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"""Expand ~ and ~user constructs.
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If user or $HOME is unknown, do nothing."""
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if isinstance(path, bytes):
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tilde = b'~'
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else:
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tilde = '~'
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if not path.startswith(tilde):
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return path
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i, n = 1, len(path)
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while i < n and path[i] not in _get_bothseps(path):
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i += 1
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if 'HOME' in os.environ:
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userhome = os.environ['HOME']
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elif 'USERPROFILE' in os.environ:
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userhome = os.environ['USERPROFILE']
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elif not 'HOMEPATH' in os.environ:
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return path
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else:
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try:
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drive = os.environ['HOMEDRIVE']
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except KeyError:
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drive = ''
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userhome = join(drive, os.environ['HOMEPATH'])
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if isinstance(path, bytes):
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userhome = userhome.encode(sys.getfilesystemencoding())
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if i != 1: #~user
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userhome = join(dirname(userhome), path[1:i])
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return userhome + path[i:]
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# Expand paths containing shell variable substitutions.
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# The following rules apply:
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# - no expansion within single quotes
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# - '$$' is translated into '$'
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# - '%%' is translated into '%' if '%%' are not seen in %var1%%var2%
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# - ${varname} is accepted.
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# - $varname is accepted.
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# - %varname% is accepted.
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# - varnames can be made out of letters, digits and the characters '_-'
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# (though is not verifed in the ${varname} and %varname% cases)
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# XXX With COMMAND.COM you can use any characters in a variable name,
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# XXX except '^|<>='.
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def expandvars(path):
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"""Expand shell variables of the forms $var, ${var} and %var%.
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Unknown variables are left unchanged."""
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if isinstance(path, bytes):
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if ord('$') not in path and ord('%') not in path:
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return path
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import string
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varchars = bytes(string.ascii_letters + string.digits + '_-', 'ascii')
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quote = b'\''
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percent = b'%'
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brace = b'{'
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dollar = b'$'
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else:
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if '$' not in path and '%' not in path:
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return path
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import string
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varchars = string.ascii_letters + string.digits + '_-'
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quote = '\''
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percent = '%'
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brace = '{'
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dollar = '$'
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res = path[:0]
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index = 0
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pathlen = len(path)
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while index < pathlen:
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c = path[index:index+1]
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if c == quote: # no expansion within single quotes
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path = path[index + 1:]
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pathlen = len(path)
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try:
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index = path.index(c)
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res += c + path[:index + 1]
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except ValueError:
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res += path
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index = pathlen - 1
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elif c == percent: # variable or '%'
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if path[index + 1:index + 2] == percent:
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res += c
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index += 1
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else:
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path = path[index+1:]
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pathlen = len(path)
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try:
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index = path.index(percent)
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except ValueError:
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res += percent + path
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index = pathlen - 1
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else:
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var = path[:index]
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if isinstance(path, bytes):
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var = var.decode('ascii')
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if var in os.environ:
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value = os.environ[var]
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else:
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value = '%' + var + '%'
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if isinstance(path, bytes):
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value = value.encode('ascii')
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res += value
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elif c == dollar: # variable or '$$'
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if path[index + 1:index + 2] == dollar:
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res += c
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index += 1
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elif path[index + 1:index + 2] == brace:
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path = path[index+2:]
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pathlen = len(path)
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try:
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if isinstance(path, bytes):
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index = path.index(b'}')
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else:
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index = path.index('}')
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var = path[:index]
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if isinstance(path, bytes):
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var = var.decode('ascii')
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if var in os.environ:
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value = os.environ[var]
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else:
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value = '${' + var + '}'
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if isinstance(path, bytes):
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value = value.encode('ascii')
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res += value
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except ValueError:
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if isinstance(path, bytes):
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res += b'${' + path
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else:
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res += '${' + path
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index = pathlen - 1
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else:
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var = ''
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index += 1
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c = path[index:index + 1]
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while c and c in varchars:
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if isinstance(path, bytes):
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var += c.decode('ascii')
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else:
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var += c
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index += 1
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c = path[index:index + 1]
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if var in os.environ:
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value = os.environ[var]
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else:
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value = '$' + var
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if isinstance(path, bytes):
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value = value.encode('ascii')
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res += value
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if c:
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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 normcase(start_drive) != normcase(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 normcase(e1) != normcase(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
|
|
try:
|
|
# GetFinalPathNameByHandle is available starting with Windows 6.0.
|
|
# Windows XP and non-Windows OS'es will mock _getfinalpathname.
|
|
if sys.getwindowsversion()[:2] >= (6, 0):
|
|
from nt import _getfinalpathname
|
|
else:
|
|
raise ImportError
|
|
except (AttributeError, ImportError):
|
|
# On Windows XP and earlier, two files are the same if their absolute
|
|
# pathnames are the same.
|
|
# Non-Windows operating systems fake this method with an XP
|
|
# approximation.
|
|
def _getfinalpathname(f):
|
|
return abspath(f)
|
|
|
|
def samefile(f1, f2):
|
|
"Test whether two pathnames reference the same actual file"
|
|
return _getfinalpathname(f1) == _getfinalpathname(f2)
|
|
|
|
|
|
try:
|
|
from nt import _getfileinformation
|
|
except ImportError:
|
|
# On other operating systems, just return the fd and see that
|
|
# it compares equal in sameopenfile.
|
|
def _getfileinformation(fd):
|
|
return fd
|
|
|
|
def sameopenfile(f1, f2):
|
|
"""Test whether two file objects reference the same file"""
|
|
return _getfileinformation(f1) == _getfileinformation(f2)
|