Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 6719:faebc1940432 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Understand -Xlinker option.
author Guido van Rossum <guido@python.org>
date Tue, 02 Dec 1997 20:38:11 +0000
parents c7d812e4af0d
children 88992696b9e8
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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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11
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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 def join(s, *p):
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24 path = s
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25 for t in p:
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26 if (not s) or isabs(t):
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27 path = t
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28 continue
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29 if t[:1] == ':':
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30 t = t[1:]
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31 if ':' not in path:
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32 path = ':' + path
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33 if path[-1:] <> ':':
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34 path = path + ':'
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35 path = path + t
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36 return path
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38
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39 # Split a pathname in two parts: the directory leading up to the final bit,
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40 # and the basename (the filename, without colons, in that directory).
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41 # The result (s, t) is such that join(s, t) yields the original argument.
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42
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43 def split(s):
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44 if ':' not in s: return '', s
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45 colon = 0
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46 for i in range(len(s)):
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47 if s[i] == ':': colon = i+1
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48 path, file = s[:colon-1], s[colon:]
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49 if path and not ':' in path:
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50 path = path + ':'
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51 return path, file
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52
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53
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54 # Split a path in root and extension.
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55 # The extension is everything starting at the last dot in the last
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56 # pathname component; the root is everything before that.
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57 # It is always true that root + ext == p.
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58
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59 def splitext(p):
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60 root, ext = '', ''
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61 for c in p:
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62 if c == ':':
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63 root, ext = root + ext + c, ''
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64 elif c == '.':
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65 if ext:
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66 root, ext = root + ext, c
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67 else:
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68 ext = c
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69 elif ext:
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70 ext = ext + c
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71 else:
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72 root = root + c
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73 return root, ext
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74
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75
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76 # Split a pathname into a drive specification and the rest of the
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77 # path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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78 # empty (don't use the volume name -- it doesn't have the same
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79 # syntactic and semantic oddities as DOS drive letters, such as there
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80 # being a separate current directory per drive).
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81
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82 def splitdrive(p):
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83 return '', p
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85
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86 # Short interfaces to split()
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87
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88 def dirname(s): return split(s)[0]
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89 def basename(s): return split(s)[1]
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91
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92 # Return true if the pathname refers to an existing directory.
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93
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94 def isdir(s):
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95 try:
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96 st = mac.stat(s)
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97 except mac.error:
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98 return 0
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99 return S_ISDIR(st[ST_MODE])
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100
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101
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102 # Return true if the pathname refers to a symbolic link.
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103 # (Always false on the Mac, until we understand Aliases.)
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104
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105 def islink(s):
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106 return 0
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107
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108
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109 # Return true if the pathname refers to an existing regular file.
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110
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111 def isfile(s):
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112 try:
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113 st = mac.stat(s)
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114 except mac.error:
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115 return 0
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116 return S_ISREG(st[ST_MODE])
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117
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118
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119 # Return true if the pathname refers to an existing file or directory.
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120
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121 def exists(s):
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122 try:
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123 st = mac.stat(s)
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124 except mac.error:
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125 return 0
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126 return 1
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127
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128 #
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129 # dummy expandvars to retain interface-compatability with other
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130 # operating systems.
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131 def expandvars(path):
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132 return path
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133
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134 #
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135 # dummy expanduser to retain interface-compatability with other
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136 # operating systems.
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137 def expanduser(path):
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138 return path
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139
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140 # Normalize a pathname: get rid of '::' sequences by backing up,
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141 # e.g., 'foo:bar::bletch' becomes 'foo:bletch'.
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142 # Raise the exception norm_error below if backing up is impossible,
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143 # e.g., for '::foo'.
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144 # XXX The Unix version doesn't raise an exception but simply
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145 # returns an unnormalized path. Should do so here too.
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146
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147 norm_error = 'macpath.norm_error: path cannot be normalized'
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148
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149 def normpath(s):
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150 import string
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151 if ':' not in s:
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152 return ':' + s
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153 f = string.splitfields(s, ':')
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154 pre = []
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155 post = []
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156 if not f[0]:
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157 pre = f[:1]
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158 f = f[1:]
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159 if not f[len(f)-1]:
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160 post = f[-1:]
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161 f = f[:-1]
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162 res = []
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163 for seg in f:
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164 if seg:
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165 res.append(seg)
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166 else:
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167 if not res: raise norm_error, 'path starts with ::'
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168 del res[len(res)-1]
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169 if not (pre or res):
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170 raise norm_error, 'path starts with volume::'
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171 if pre: res = pre + res
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172 if post: res = res + post
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173 s = res[0]
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174 for seg in res[1:]:
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175 s = s + ':' + seg
1086
db817f3a1c65 * change default line numbers for 'list' in pdb.py
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176 return s
2910
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177
2947
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178
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179 # Directory tree walk.
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180 # For each directory under top (including top itself),
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181 # func(arg, dirname, filenames) is called, where
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182 # dirname is the name of the directory and filenames is the list
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183 # of files (and subdirectories etc.) in the directory.
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184 # The func may modify the filenames list, to implement a filter,
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185 # or to impose a different order of visiting.
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186
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187 def walk(top, func, arg):
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188 try:
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189 names = mac.listdir(top)
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190 except mac.error:
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191 return
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192 func(arg, top, names)
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193 for name in names:
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194 name = join(top, name)
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195 if isdir(name):
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196 walk(name, func, arg)