Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 8234d26b13c1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Pathname and path-related operations for the Macintosh."""
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2
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3 import os
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4 import warnings
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5 from stat import *
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6 import genericpath
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7 from genericpath import *
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8
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9 __all__ = ["normcase","isabs","join","splitdrive","split","splitext",
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10 "basename","dirname","commonprefix","getsize","getmtime",
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11 "getatime","getctime", "islink","exists","lexists","isdir","isfile",
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12 "walk","expanduser","expandvars","normpath","abspath",
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13 "curdir","pardir","sep","pathsep","defpath","altsep","extsep",
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14 "devnull","realpath","supports_unicode_filenames"]
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16 # strings representing various path-related bits and pieces
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17 curdir = ':'
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18 pardir = '::'
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19 extsep = '.'
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20 sep = ':'
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21 pathsep = '\n'
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22 defpath = ':'
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23 altsep = None
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24 devnull = 'Dev:Null'
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25
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26 # Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
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27
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28 def normcase(path):
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29 return path.lower()
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32 def isabs(s):
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33 """Return true if a path is absolute.
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34 On the Mac, relative paths begin with a colon,
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35 but as a special case, paths with no colons at all are also relative.
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36 Anything else is absolute (the string up to the first colon is the
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37 volume name)."""
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38
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39 return ':' in s and s[0] != ':'
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41
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42 def join(s, *p):
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43 path = s
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44 for t in p:
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45 if (not s) or isabs(t):
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46 path = t
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47 continue
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48 if t[:1] == ':':
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49 t = t[1:]
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50 if ':' not in path:
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51 path = ':' + path
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52 if path[-1:] != ':':
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53 path = path + ':'
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54 path = path + t
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55 return path
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57
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58 def split(s):
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59 """Split a pathname into two parts: the directory leading up to the final
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60 bit, and the basename (the filename, without colons, in that directory).
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61 The result (s, t) is such that join(s, t) yields the original argument."""
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63 if ':' not in s: return '', s
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64 colon = 0
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65 for i in range(len(s)):
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66 if s[i] == ':': colon = i + 1
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67 path, file = s[:colon-1], s[colon:]
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68 if path and not ':' in path:
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69 path = path + ':'
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70 return path, file
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72
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73 def splitext(p):
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74 return genericpath._splitext(p, sep, altsep, extsep)
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75 splitext.__doc__ = genericpath._splitext.__doc__
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76
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77 def splitdrive(p):
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78 """Split a pathname into a drive specification and the rest of the
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79 path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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80 empty (don't use the volume name -- it doesn't have the same
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81 syntactic and semantic oddities as DOS drive letters, such as there
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82 being a separate current directory per drive)."""
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83
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84 return '', p
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86
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87 # Short interfaces to split()
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88
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89 def dirname(s): return split(s)[0]
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90 def basename(s): return split(s)[1]
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91
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92 def ismount(s):
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93 if not isabs(s):
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94 return False
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95 components = split(s)
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96 return len(components) == 2 and components[1] == ''
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98 def islink(s):
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99 """Return true if the pathname refers to a symbolic link."""
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101 try:
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102 import Carbon.File
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103 return Carbon.File.ResolveAliasFile(s, 0)[2]
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104 except:
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105 return False
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107 # Is `stat`/`lstat` a meaningful difference on the Mac? This is safe in any
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108 # case.
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110 def lexists(path):
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111 """Test whether a path exists. Returns True for broken symbolic links"""
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112
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113 try:
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114 st = os.lstat(path)
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115 except os.error:
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116 return False
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117 return True
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118
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119 def expandvars(path):
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120 """Dummy to retain interface-compatibility with other operating systems."""
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121 return path
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123
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124 def expanduser(path):
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125 """Dummy to retain interface-compatibility with other operating systems."""
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126 return path
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127
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128 class norm_error(Exception):
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129 """Path cannot be normalized"""
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130
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131 def normpath(s):
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132 """Normalize a pathname. Will return the same result for
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133 equivalent paths."""
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134
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135 if ":" not in s:
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136 return ":"+s
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137
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138 comps = s.split(":")
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139 i = 1
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140 while i < len(comps)-1:
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141 if comps[i] == "" and comps[i-1] != "":
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142 if i > 1:
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143 del comps[i-1:i+1]
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144 i = i - 1
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145 else:
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146 # best way to handle this is to raise an exception
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147 raise norm_error, 'Cannot use :: immediately after volume name'
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148 else:
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149 i = i + 1
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150
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151 s = ":".join(comps)
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152
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153 # remove trailing ":" except for ":" and "Volume:"
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154 if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s):
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155 s = s[:-1]
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156 return s
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157
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158
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159 def walk(top, func, arg):
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160 """Directory tree walk with callback function.
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161
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162 For each directory in the directory tree rooted at top (including top
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163 itself, but excluding '.' and '..'), call func(arg, dirname, fnames).
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164 dirname is the name of the directory, and fnames a list of the names of
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165 the files and subdirectories in dirname (excluding '.' and '..'). func
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166 may modify the fnames list in-place (e.g. via del or slice assignment),
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167 and walk will only recurse into the subdirectories whose names remain in
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168 fnames; this can be used to implement a filter, or to impose a specific
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169 order of visiting. No semantics are defined for, or required of, arg,
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170 beyond that arg is always passed to func. It can be used, e.g., to pass
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171 a filename pattern, or a mutable object designed to accumulate
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172 statistics. Passing None for arg is common."""
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173 warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.",
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174 stacklevel=2)
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175 try:
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176 names = os.listdir(top)
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177 except os.error:
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178 return
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179 func(arg, top, names)
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180 for name in names:
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181 name = join(top, name)
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182 if isdir(name) and not islink(name):
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183 walk(name, func, arg)
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184
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185
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186 def abspath(path):
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187 """Return an absolute path."""
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188 if not isabs(path):
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189 if isinstance(path, unicode):
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190 cwd = os.getcwdu()
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191 else:
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192 cwd = os.getcwd()
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193 path = join(cwd, path)
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194 return normpath(path)
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195
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196 # realpath is a no-op on systems without islink support
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197 def realpath(path):
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198 path = abspath(path)
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199 try:
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200 import Carbon.File
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201 except ImportError:
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202 return path
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203 if not path:
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204 return path
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205 components = path.split(':')
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206 path = components[0] + ':'
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207 for c in components[1:]:
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208 path = join(path, c)
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209 try:
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210 path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
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211 except Carbon.File.Error:
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212 pass
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213 return path
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214
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215 supports_unicode_filenames = True