"""Pathname and path-related operations for the Macintosh."""

# strings representing various path-related bits and pieces
# These are primarily for export; internally, they are hardcoded.
# Should be set before imports for resolving cyclic dependency.
curdir = ':'
pardir = '::'
extsep = '.'
sep = ':'
pathsep = '\n'
defpath = ':'
altsep = None
devnull = 'Dev:Null'

import os
from stat import *
import genericpath
from genericpath import *
import warnings

warnings.warn('the macpath module is deprecated in 3.7 and will be removed '
 'in 3.8', DeprecationWarning, stacklevel=2)

__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"]

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):
 try:
 colon = _get_colon(s)
 path = s
 if not p:
 path[:0] + colon #23780: Ensure compatible data type even if p is null.
 for t in p:
 if (not path) 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
 except (TypeError, AttributeError, BytesWarning):
 genericpath._check_arg_types('join', s, *p)
 raise


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 OSError:
 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