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
217
218
219
220
221
222
223
|
"""Pathname and path-related operations for the Macintosh."""
import os
from stat import *
# Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
def normcase(path):
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)."""
return ':' in s and s[0] != ':'
def join(s, *p):
path = s
for t in p:
if (not s) or isabs(t):
path = t
continue
if t[:1] == ':':
t = t[1:]
if ':' not in path:
path = ':' + path
if path[-1:] != ':':
path = path + ':'
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."""
if ':' not in s: return '', s
colon = 0
for i in range(len(s)):
if s[i] == ':': colon = i + 1
path, file = s[:colon-1], s[colon:]
if path and not ':' in path:
path = path + ':'
return path, file
def splitext(p):
"""Split a path into root and extension.
The extension is everything starting at the last dot in the last
pathname component; the root is everything before that.
It is always true that root + ext == p."""
root, ext = '', ''
for c in p:
if c == ':':
root, ext = root + ext + c, ''
elif c == '.':
if ext:
root, ext = root + ext, c
else:
ext = c
elif ext:
ext = ext + c
else:
root = root + c
return root, ext
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
# Short interfaces to split()
def dirname(s): return split(s)[0]
def basename(s): return split(s)[1]
def isdir(s):
"""Return true if the pathname refers to an existing directory."""
try:
st = os.stat(s)
except os.error:
return 0
return S_ISDIR(st[ST_MODE])
# Get size, mtime, atime of files.
def getsize(filename):
"""Return the size of a file, reported by os.stat()."""
st = os.stat(filename)
return st[ST_SIZE]
def getmtime(filename):
"""Return the last modification time of a file, reported by os.stat()."""
st = os.stat(filename)
return st[ST_MTIME]
def getatime(filename):
"""Return the last access time of a file, reported by os.stat()."""
st = os.stat(filename)
return st[ST_ATIME]
def islink(s):
"""Return true if the pathname refers to a symbolic link.
Always false on the Mac, until we understand Aliases.)"""
return 0
def isfile(s):
"""Return true if the pathname refers to an existing regular file."""
try:
st = os.stat(s)
except os.error:
return 0
return S_ISREG(st[ST_MODE])
def exists(s):
"""Return true if the pathname refers to an existing file or directory."""
try:
st = os.stat(s)
except os.error:
return 0
return 1
# Return the longest prefix of all list elements.
def commonprefix(m):
"Given a list of pathnames, returns the longest common leading component"
if not m: return ''
prefix = m[0]
for item in m:
for i in range(len(prefix)):
if prefix[:i+1] != item[:i+1]:
prefix = prefix[:i]
if i == 0: return ''
break
return prefix
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
norm_error = 'macpath.norm_error: path cannot be normalized'
def normpath(s):
"""Normalize a pathname. Will return the same result for
equivalent paths."""
if ":" not in s:
return ":"+s
comps = s.split(":")
i = 1
while i < len(comps)-1:
if 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 :: immedeately after volume name'
else:
i = i + 1
s = ":".join(comps)
# remove trailing ":" except for ":" and "Volume:"
if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s):
s = s[:-1]
return s
def walk(top, func, arg):
"""Directory tree walk.
For each directory under top (including top itself),
func(arg, dirname, filenames) is called, where
dirname is the name of the directory and filenames is the list
of files (and subdirectories etc.) in the directory.
The func may modify the filenames list, to implement a filter,
or to impose a different order of visiting."""
try:
names = os.listdir(top)
except os.error:
return
func(arg, top, names)
for name in names:
name = join(top, name)
if isdir(name):
walk(name, func, arg)
def abspath(path):
"""Return an absolute path."""
if not isabs(path):
path = join(os.getcwd(), path)
return normpath(path)
|
