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posixpath.pyc
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2004-02-22
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# Source Generated with Decompyle++
# File: in.pyc (Python 2.3)
'''Common operations on Posix pathnames.
Instead of importing this module directly, import os and refer to
this module as os.path. The "os.path" name is an alias for this
module on Posix systems; on other systems (e.g. Mac, Windows),
os.path provides the same operations in a manner specific to that
platform, and is an alias to another module (e.g. macpath, ntpath).
Some of this can actually be useful on non-Posix systems too, e.g.
for manipulation of the pathname component of URLs.
'''
import sys
import os
import stat
__all__ = [
'normcase',
'isabs',
'join',
'splitdrive',
'split',
'splitext',
'basename',
'dirname',
'commonprefix',
'getsize',
'getmtime',
'getatime',
'getctime',
'islink',
'exists',
'isdir',
'isfile',
'ismount',
'walk',
'expanduser',
'expandvars',
'normpath',
'abspath',
'samefile',
'sameopenfile',
'samestat',
'curdir',
'pardir',
'sep',
'pathsep',
'defpath',
'altsep',
'extsep',
'realpath',
'supports_unicode_filenames']
curdir = '.'
pardir = '..'
extsep = '.'
sep = '/'
pathsep = ':'
defpath = ':/bin:/usr/bin'
altsep = None
def normcase(s):
'''Normalize case of pathname. Has no effect under Posix'''
return s
def isabs(s):
'''Test whether a path is absolute'''
return s.startswith('/')
def join(a, *p):
"""Join two or more pathname components, inserting '/' as needed"""
path = a
for b in p:
if b.startswith('/'):
path = b
continue
if path == '' or path.endswith('/'):
path += b
continue
path += '/' + b
return path
def split(p):
'''Split a pathname. Returns tuple "(head, tail)" where "tail" is
everything after the final slash. Either part may be empty.'''
i = p.rfind('/') + 1
(head, tail) = (p[:i], p[i:])
if head and head != '/' * len(head):
head = head.rstrip('/')
return (head, tail)
def splitext(p):
'''Split the extension from a pathname. Extension is everything from the
last dot to the end. Returns "(root, ext)", either part may be empty.'''
i = p.rfind('.')
if i <= p.rfind('/'):
return (p, '')
else:
return (p[:i], p[i:])
def splitdrive(p):
'''Split a pathname into drive and path. On Posix, drive is always
empty.'''
return ('', p)
def basename(p):
'''Returns the final component of a pathname'''
return split(p)[1]
def dirname(p):
'''Returns the directory component of a pathname'''
return split(p)[0]
def commonprefix(m):
'''Given a list of pathnames, returns the longest common leading component'''
if not m:
return ''
prefix = m[0]
for item in m:
for i in range(len(prefix)):
if prefix[:i + 1] != item[:i + 1]:
prefix = prefix[:i]
if i == 0:
return ''
break
continue
return prefix
def getsize(filename):
'''Return the size of a file, reported by os.stat().'''
return os.stat(filename).st_size
def getmtime(filename):
'''Return the last modification time of a file, reported by os.stat().'''
return os.stat(filename).st_mtime
def getatime(filename):
'''Return the last access time of a file, reported by os.stat().'''
return os.stat(filename).st_atime
def getctime(filename):
'''Return the creation time of a file, reported by os.stat().'''
return os.stat(filename).st_ctime
def islink(path):
'''Test whether a path is a symbolic link'''
try:
st = os.lstat(path)
except (os.error, AttributeError):
return False
return stat.S_ISLNK(st.st_mode)
def exists(path):
'''Test whether a path exists. Returns False for broken symbolic links'''
try:
st = os.stat(path)
except os.error:
return False
return True
def isdir(path):
'''Test whether a path is a directory'''
try:
st = os.stat(path)
except os.error:
return False
return stat.S_ISDIR(st.st_mode)
def isfile(path):
'''Test whether a path is a regular file'''
try:
st = os.stat(path)
except os.error:
return False
return stat.S_ISREG(st.st_mode)
def samefile(f1, f2):
'''Test whether two pathnames reference the same actual file'''
s1 = os.stat(f1)
s2 = os.stat(f2)
return samestat(s1, s2)
def sameopenfile(fp1, fp2):
'''Test whether two open file objects reference the same file'''
s1 = os.fstat(fp1)
s2 = os.fstat(fp2)
return samestat(s1, s2)
def samestat(s1, s2):
'''Test whether two stat buffers reference the same file'''
if s1.st_ino == s2.st_ino:
pass
return s1.st_dev == s2.st_dev
def ismount(path):
'''Test whether a path is a mount point'''
try:
s1 = os.stat(path)
s2 = os.stat(join(path, '..'))
except os.error:
return False
dev1 = s1.st_dev
dev2 = s2.st_dev
if dev1 != dev2:
return True
ino1 = s1.st_ino
ino2 = s2.st_ino
if ino1 == ino2:
return True
return False
def walk(top, func, arg):
"""Directory tree walk with callback function.
For each directory in the directory tree rooted at top (including top
itself, but excluding '.' and '..'), call func(arg, dirname, fnames).
dirname is the name of the directory, and fnames a list of the names of
the files and subdirectories in dirname (excluding '.' and '..'). func
may modify the fnames list in-place (e.g. via del or slice assignment),
and walk will only recurse into the subdirectories whose names remain in
fnames; this can be used to implement a filter, or to impose a specific
order of visiting. No semantics are defined for, or required of, arg,
beyond that arg is always passed to func. It can be used, e.g., to pass
a filename pattern, or a mutable object designed to accumulate
statistics. Passing None for arg is common."""
try:
names = os.listdir(top)
except os.error:
return None
func(arg, top, names)
for name in names:
name = join(top, name)
try:
st = os.lstat(name)
except os.error:
continue
if stat.S_ISDIR(st.st_mode):
walk(name, func, arg)
continue
def expanduser(path):
'''Expand ~ and ~user constructions. If user or $HOME is unknown,
do nothing.'''
if not path.startswith('~'):
return path
i = path.find('/', 1)
if i < 0:
i = len(path)
if i == 1:
if 'HOME' not in os.environ:
import pwd
userhome = pwd.getpwuid(os.getuid()).pw_dir
else:
userhome = os.environ['HOME']
else:
import pwd
try:
pwent = pwd.getpwnam(path[1:i])
except KeyError:
return path
userhome = pwent.pw_dir
if userhome.endswith('/'):
i += 1
return userhome + path[i:]
_varprog = None
def expandvars(path):
'''Expand shell variables of form $var and ${var}. Unknown variables
are left unchanged.'''
global _varprog
if '$' not in path:
return path
if not _varprog:
import re
_varprog = re.compile('\\$(\\w+|\\{[^}]*\\})')
i = 0
while True:
m = _varprog.search(path, i)
if not m:
break
(i, j) = m.span(0)
name = m.group(1)
if name.startswith('{') and name.endswith('}'):
name = name[1:-1]
if name in os.environ:
tail = path[j:]
path = path[:i] + os.environ[name]
i = len(path)
path += tail
continue
i = j
return path
def normpath(path):
'''Normalize path, eliminating double slashes, etc.'''
if path == '':
return '.'
initial_slashes = path.startswith('/')
if initial_slashes and path.startswith('//') and not path.startswith('///'):
initial_slashes = 2
comps = path.split('/')
new_comps = []
for comp in comps:
if comp in ('', '.'):
continue
if not comp != '..':
if not initial_slashes and not new_comps and new_comps and new_comps[-1] == '..':
new_comps.append(comp)
continue
if new_comps:
new_comps.pop()
continue
comps = new_comps
path = '/'.join(comps)
if initial_slashes:
path = '/' * initial_slashes + path
if not path:
pass
return '.'
def abspath(path):
'''Return an absolute path.'''
if not isabs(path):
path = join(os.getcwd(), path)
return normpath(path)
def realpath(filename):
'''Return the canonical path of the specified filename, eliminating any
symbolic links encountered in the path.'''
filename = abspath(filename)
bits = [
'/'] + filename.split('/')[1:]
for i in range(2, len(bits) + 1):
component = join(*bits[0:i])
if islink(component):
resolved = os.readlink(component)
(dir, file) = split(component)
resolved = normpath(join(dir, resolved))
newpath = join(*[
resolved] + bits[i:])
return realpath(newpath)
continue
return filename
supports_unicode_filenames = False