"""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
