Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 4566:6403c94de50d legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents ca02d9278180
children 666152b77027
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1 # module 'macpath' -- pathname (or -related) operations for the Macintosh
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2
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3 import string
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4 import mac
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5 from stat import *
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6
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7
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8 # Normalize the case of a pathname. Dummy in Posix, but string.lower here.
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9
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10 normcase = string.lower
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12
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13 # Return true if a path is absolute.
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14 # On the Mac, relative paths begin with a colon,
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15 # but as a special case, paths with no colons at all are also relative.
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16 # Anything else is absolute (the string up to the first colon is the
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17 # volume name).
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18
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19 def isabs(s):
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20 return ':' in s and s[0] <> ':'
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21
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22
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23 # Join two pathnames.
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24 # The result is equivalent to what the second pathname would refer to
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25 # if the first pathname were the current directory.
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26
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27 def join(s, t):
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28 if (not s) or isabs(t): return t
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29 if t[:1] == ':': t = t[1:]
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30 if ':' not in s:
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31 s = ':' + s
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32 if s[-1:] <> ':':
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33 s = s + ':'
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34 return s + t
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35
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36
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37 # Split a pathname in two parts: the directory leading up to the final bit,
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38 # and the basename (the filename, without colons, in that directory).
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39 # The result (s, t) is such that join(s, t) yields the original argument.
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40
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41 def split(s):
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42 if ':' not in s: return '', s
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43 colon = 0
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44 for i in range(len(s)):
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45 if s[i] == ':': colon = i+1
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46 return s[:colon-1], s[colon:]
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47
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48
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49 # Split a path in root and extension.
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50 # The extension is everything starting at the last dot in the last
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51 # pathname component; the root is everything before that.
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52 # It is always true that root + ext == p.
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53
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54 def splitext(p):
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55 root, ext = '', ''
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56 for c in p:
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57 if c == ':':
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58 root, ext = root + ext + c, ''
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59 elif c == '.':
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60 if ext:
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61 root, ext = root + ext, c
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62 else:
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63 ext = c
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64 elif ext:
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65 ext = ext + c
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66 else:
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67 root = root + c
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68 return root, ext
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69
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71 # Split a pathname into a drive specification and the rest of the
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72 # path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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73 # empty (don't use the volume name -- it doesn't have the same
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74 # syntactic and semantic oddities as DOS drive letters, such as there
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75 # being a separate current directory per drive).
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76
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77 def splitdrive(p):
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78 return '', p
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79
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80
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81 # Short interfaces to split()
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82
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83 def dirname(s): return split(s)[0]
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84 def basename(s): return split(s)[1]
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85
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87 # Return true if the pathname refers to an existing directory.
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88
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89 def isdir(s):
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90 try:
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91 st = mac.stat(s)
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92 except mac.error:
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93 return 0
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94 return S_ISDIR(st[ST_MODE])
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95
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97 # Return true if the pathname refers to a symbolic link.
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98 # (Always false on the Mac, until we understand Aliases.)
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99
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100 def islink(s):
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101 return 0
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102
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103
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104 # Return true if the pathname refers to an existing regular file.
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106 def isfile(s):
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107 try:
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108 st = mac.stat(s)
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109 except mac.error:
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110 return 0
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111 return S_ISREG(st[ST_MODE])
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112
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113
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114 # Return true if the pathname refers to an existing file or directory.
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115
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116 def exists(s):
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117 try:
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118 st = mac.stat(s)
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119 except mac.error:
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120 return 0
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121 return 1
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122
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123 #
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124 # dummy expandvars to retain interface-compatability with other
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125 # operating systems.
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126 def expandvars(path):
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127 return path
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128
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129 #
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130 # dummy expanduser to retain interface-compatability with other
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131 # operating systems.
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132 def expanduser(path):
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133 return path
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134
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135 # Normalize a pathname: get rid of '::' sequences by backing up,
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136 # e.g., 'foo:bar::bletch' becomes 'foo:bletch'.
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137 # Raise the exception norm_error below if backing up is impossible,
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138 # e.g., for '::foo'.
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139 # XXX The Unix version doesn't raise an exception but simply
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140 # returns an unnormalized path. Should do so here too.
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141
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142 norm_error = 'macpath.norm_error: path cannot be normalized'
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143
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144 def normpath(s):
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145 import string
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146 if ':' not in s:
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147 return ':' + s
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148 f = string.splitfields(s, ':')
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149 pre = []
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150 post = []
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151 if not f[0]:
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152 pre = f[:1]
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153 f = f[1:]
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154 if not f[len(f)-1]:
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155 post = f[-1:]
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156 f = f[:-1]
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157 res = []
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158 for seg in f:
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159 if seg:
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160 res.append(seg)
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161 else:
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162 if not res: raise norm_error, 'path starts with ::'
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163 del res[len(res)-1]
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164 if not (pre or res):
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165 raise norm_error, 'path starts with volume::'
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166 if pre: res = pre + res
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167 if post: res = res + post
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168 s = res[0]
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169 for seg in res[1:]:
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170 s = s + ':' + seg
1086
db817f3a1c65 * change default line numbers for 'list' in pdb.py
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171 return s
2910
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172
2947
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173
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174 # Directory tree walk.
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175 # For each directory under top (including top itself),
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176 # func(arg, dirname, filenames) is called, where
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177 # dirname is the name of the directory and filenames is the list
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178 # of files (and subdirectories etc.) in the directory.
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179 # The func may modify the filenames list, to implement a filter,
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180 # or to impose a different order of visiting.
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181
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182 def walk(top, func, arg):
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183 try:
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184 names = mac.listdir(top)
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185 except mac.error:
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186 return
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187 func(arg, top, names)
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188 for name in names:
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189 name = join(top, name)
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190 if isdir(name):
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191 walk(name, func, arg)