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Python Compiled Bytecode | 2009-11-11 | 11KB | 396 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.6)

'''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 os
import stat
import genericpath
import warnings
from genericpath import *
__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',
    'samefile',
    'sameopenfile',
    'samestat',
    'curdir',
    'pardir',
    'sep',
    'pathsep',
    'defpath',
    'altsep',
    'extsep',
    'devnull',
    'realpath',
    'supports_unicode_filenames',
    'relpath']
curdir = '.'
pardir = '..'
extsep = '.'
sep = '/'
pathsep = ':'
defpath = ':/bin:/usr/bin'
altsep = None
devnull = '/dev/null'

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.
    If any component is an absolute path, all previous path components
    will be discarded."""
    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 = p[:i]
    tail = p[i:]
    if head and head != '/' * len(head):
        head = head.rstrip('/')

    return (head, tail)


def splitext(p):
    return genericpath._splitext(p, sep, altsep, extsep)

splitext.__doc__ = genericpath._splitext.__doc__

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'''
    i = p.rfind('/') + 1
    return p[i:]


def dirname(p):
    '''Returns the directory component of a pathname'''
    i = p.rfind('/') + 1
    head = p[:i]
    if head and head != '/' * len(head):
        head = head.rstrip('/')

    return head


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 lexists(path):
    '''Test whether a path exists.  Returns True for broken symbolic links'''

    try:
        st = os.lstat(path)
    except os.error:
        return False

    return True


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.lstat(path)
        s2 = os.lstat(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."""
    warnings.warnpy3k('In 3.x, os.path.walk is removed in favor of os.walk.', stacklevel = 2)

    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 as pwd
            userhome = pwd.getpwuid(os.getuid()).pw_dir
        else:
            userhome = os.environ['HOME']
    else:
        import pwd as pwd

        try:
            pwent = pwd.getpwnam(path[1:i])
        except KeyError:
            return path

        userhome = pwent.pw_dir
    if not userhome.rstrip('/'):
        pass
    userhome = userhome
    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 as 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 or not new_comps or 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.'''
    if isabs(filename):
        bits = [
            '/'] + filename.split('/')[1:]
    else:
        bits = [
            ''] + filename.split('/')
    for i in range(2, len(bits) + 1):
        component = join(*bits[0:i])
        if islink(component):
            resolved = _resolve_link(component)
            if resolved is None:
                return abspath(join(*[
                    component] + bits[i:]))
            newpath = join(*[
                resolved] + bits[i:])
            return realpath(newpath)
        islink(component)

    return abspath(filename)


def _resolve_link(path):
    """Internal helper function.  Takes a path and follows symlinks
    until we either arrive at something that isn't a symlink, or
    encounter a path we've seen before (meaning that there's a loop).
    """
    paths_seen = []
    while islink(path):
        if path in paths_seen:
            return None
        paths_seen.append(path)
        resolved = os.readlink(path)
        if not isabs(resolved):
            dir = dirname(path)
            path = normpath(join(dir, resolved))
            continue
        path in paths_seen
        path = normpath(resolved)
    return path

supports_unicode_filenames = False

def relpath(path, start = curdir):
    '''Return a relative version of a path'''
    if not path:
        raise ValueError('no path specified')
    path
    start_list = abspath(start).split(sep)
    path_list = abspath(path).split(sep)
    i = len(commonprefix([
        start_list,
        path_list]))
    rel_list = [
        pardir] * (len(start_list) - i) + path_list[i:]
    if not rel_list:
        return curdir
    return join(*rel_list)