summaryrefslogtreecommitdiffstats
path: root/Lib/macpath.py
blob: aacf7235b011fd0e69626b69ff595de800d0b761 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
"""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