mirror of
https://github.com/python/cpython.git
synced 2024-12-16 21:34:44 +08:00
ccb706cf0a
(macpath module).
206 lines
5.5 KiB
Python
206 lines
5.5 KiB
Python
"""Pathname and path-related operations for the Macintosh."""
|
|
|
|
import os
|
|
from stat import *
|
|
import genericpath
|
|
from genericpath import *
|
|
|
|
__all__ = ["normcase","isabs","join","splitdrive","split","splitext",
|
|
"basename","dirname","commonprefix","getsize","getmtime",
|
|
"getatime","getctime", "islink","exists","lexists","isdir","isfile",
|
|
"expanduser","expandvars","normpath","abspath",
|
|
"curdir","pardir","sep","pathsep","defpath","altsep","extsep",
|
|
"devnull","realpath","supports_unicode_filenames"]
|
|
|
|
# strings representing various path-related bits and pieces
|
|
# These are primarily for export; internally, they are hardcoded.
|
|
curdir = ':'
|
|
pardir = '::'
|
|
extsep = '.'
|
|
sep = ':'
|
|
pathsep = '\n'
|
|
defpath = ':'
|
|
altsep = None
|
|
devnull = 'Dev:Null'
|
|
|
|
def _get_colon(path):
|
|
if isinstance(path, bytes):
|
|
return b':'
|
|
else:
|
|
return ':'
|
|
|
|
# Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
|
|
|
|
def normcase(path):
|
|
if not isinstance(path, (bytes, str)):
|
|
raise TypeError("normcase() argument must be str or bytes, "
|
|
"not '{}'".format(path.__class__.__name__))
|
|
return path.lower()
|
|
|
|
|
|
def isabs(s):
|
|
"""Return true if a path is absolute.
|
|
On the Mac, relative paths begin with a colon,
|
|
but as a special case, paths with no colons at all are also relative.
|
|
Anything else is absolute (the string up to the first colon is the
|
|
volume name)."""
|
|
|
|
colon = _get_colon(s)
|
|
return colon in s and s[:1] != colon
|
|
|
|
|
|
def join(s, *p):
|
|
colon = _get_colon(s)
|
|
path = s
|
|
for t in p:
|
|
if (not s) or isabs(t):
|
|
path = t
|
|
continue
|
|
if t[:1] == colon:
|
|
t = t[1:]
|
|
if colon not in path:
|
|
path = colon + path
|
|
if path[-1:] != colon:
|
|
path = path + colon
|
|
path = path + t
|
|
return path
|
|
|
|
|
|
def split(s):
|
|
"""Split a pathname into two parts: the directory leading up to the final
|
|
bit, and the basename (the filename, without colons, in that directory).
|
|
The result (s, t) is such that join(s, t) yields the original argument."""
|
|
|
|
colon = _get_colon(s)
|
|
if colon not in s: return s[:0], s
|
|
col = 0
|
|
for i in range(len(s)):
|
|
if s[i:i+1] == colon: col = i + 1
|
|
path, file = s[:col-1], s[col:]
|
|
if path and not colon in path:
|
|
path = path + colon
|
|
return path, file
|
|
|
|
|
|
def splitext(p):
|
|
if isinstance(p, bytes):
|
|
return genericpath._splitext(p, b':', altsep, b'.')
|
|
else:
|
|
return genericpath._splitext(p, sep, altsep, extsep)
|
|
splitext.__doc__ = genericpath._splitext.__doc__
|
|
|
|
def splitdrive(p):
|
|
"""Split a pathname into a drive specification and the rest of the
|
|
path. Useful on DOS/Windows/NT; on the Mac, the drive is always
|
|
empty (don't use the volume name -- it doesn't have the same
|
|
syntactic and semantic oddities as DOS drive letters, such as there
|
|
being a separate current directory per drive)."""
|
|
|
|
return p[:0], p
|
|
|
|
|
|
# Short interfaces to split()
|
|
|
|
def dirname(s): return split(s)[0]
|
|
def basename(s): return split(s)[1]
|
|
|
|
def ismount(s):
|
|
if not isabs(s):
|
|
return False
|
|
components = split(s)
|
|
return len(components) == 2 and not components[1]
|
|
|
|
def islink(s):
|
|
"""Return true if the pathname refers to a symbolic link."""
|
|
|
|
try:
|
|
import Carbon.File
|
|
return Carbon.File.ResolveAliasFile(s, 0)[2]
|
|
except:
|
|
return False
|
|
|
|
# Is `stat`/`lstat` a meaningful difference on the Mac? This is safe in any
|
|
# case.
|
|
|
|
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 expandvars(path):
|
|
"""Dummy to retain interface-compatibility with other operating systems."""
|
|
return path
|
|
|
|
|
|
def expanduser(path):
|
|
"""Dummy to retain interface-compatibility with other operating systems."""
|
|
return path
|
|
|
|
class norm_error(Exception):
|
|
"""Path cannot be normalized"""
|
|
|
|
def normpath(s):
|
|
"""Normalize a pathname. Will return the same result for
|
|
equivalent paths."""
|
|
|
|
colon = _get_colon(s)
|
|
|
|
if colon not in s:
|
|
return colon + s
|
|
|
|
comps = s.split(colon)
|
|
i = 1
|
|
while i < len(comps)-1:
|
|
if not comps[i] and comps[i-1]:
|
|
if i > 1:
|
|
del comps[i-1:i+1]
|
|
i = i - 1
|
|
else:
|
|
# best way to handle this is to raise an exception
|
|
raise norm_error('Cannot use :: immediately after volume name')
|
|
else:
|
|
i = i + 1
|
|
|
|
s = colon.join(comps)
|
|
|
|
# remove trailing ":" except for ":" and "Volume:"
|
|
if s[-1:] == colon and len(comps) > 2 and s != colon*len(s):
|
|
s = s[:-1]
|
|
return s
|
|
|
|
def abspath(path):
|
|
"""Return an absolute path."""
|
|
if not isabs(path):
|
|
if isinstance(path, bytes):
|
|
cwd = os.getcwdb()
|
|
else:
|
|
cwd = os.getcwd()
|
|
path = join(cwd, path)
|
|
return normpath(path)
|
|
|
|
# realpath is a no-op on systems without islink support
|
|
def realpath(path):
|
|
path = abspath(path)
|
|
try:
|
|
import Carbon.File
|
|
except ImportError:
|
|
return path
|
|
if not path:
|
|
return path
|
|
colon = _get_colon(path)
|
|
components = path.split(colon)
|
|
path = components[0] + colon
|
|
for c in components[1:]:
|
|
path = join(path, c)
|
|
try:
|
|
path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
|
|
except Carbon.File.Error:
|
|
pass
|
|
return path
|
|
|
|
supports_unicode_filenames = True
|