Mercurial > cpython-lru_cache-weakref

annotate Lib/macpath.py @ 44825:ef859cd754a7 legacy-trunk

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Fixed a wrong assumption in configure.in and Include/pyport.h. The is finite function is not called isfinite() but finite(). Sorry, my fault. :)
author Christian Heimes <christian@cheimes.de>
date Sun, 20 Jan 2008 14:28:28 +0000
parents 98bbc93bd55b
children b93005712e39 907a45df1295
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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 from stat import *
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5 import genericpath
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6 from genericpath import *
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7
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8 __all__ = ["normcase","isabs","join","splitdrive","split","splitext",
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9 "basename","dirname","commonprefix","getsize","getmtime",
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10 "getatime","getctime", "islink","exists","lexists","isdir","isfile",
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11 "walk","expanduser","expandvars","normpath","abspath",
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12 "curdir","pardir","sep","pathsep","defpath","altsep","extsep",
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13 "devnull","realpath","supports_unicode_filenames"]
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14
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15 # strings representing various path-related bits and pieces
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16 curdir = ':'
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17 pardir = '::'
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18 extsep = '.'
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19 sep = ':'
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20 pathsep = '\n'
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21 defpath = ':'
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22 altsep = None
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23 devnull = 'Dev:Null'
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24
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25 # Normalize the case of a pathname. Dummy in Posix, but <s>.lower() here.
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26
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27 def normcase(path):
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28 return path.lower()
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29
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31 def isabs(s):
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32 """Return true if a path is absolute.
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33 On the Mac, relative paths begin with a colon,
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34 but as a special case, paths with no colons at all are also relative.
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35 Anything else is absolute (the string up to the first colon is the
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36 volume name)."""
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38 return ':' in s and s[0] != ':'
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39
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40
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41 def join(s, *p):
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42 path = s
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43 for t in p:
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44 if (not s) or isabs(t):
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45 path = t
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46 continue
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47 if t[:1] == ':':
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48 t = t[1:]
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49 if ':' not in path:
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50 path = ':' + path
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51 if path[-1:] != ':':
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52 path = path + ':'
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53 path = path + t
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54 return path
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57 def split(s):
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58 """Split a pathname into two parts: the directory leading up to the final
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59 bit, and the basename (the filename, without colons, in that directory).
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60 The result (s, t) is such that join(s, t) yields the original argument."""
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62 if ':' not in s: return '', s
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63 colon = 0
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64 for i in range(len(s)):
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65 if s[i] == ':': colon = i + 1
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66 path, file = s[:colon-1], s[colon:]
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67 if path and not ':' in path:
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68 path = path + ':'
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69 return path, file
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72 def splitext(p):
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73 return genericpath._splitext(p, sep, altsep, extsep)
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74 splitext.__doc__ = genericpath._splitext.__doc__
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75
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76 def splitdrive(p):
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77 """Split a pathname into a drive specification and the rest of the
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78 path. Useful on DOS/Windows/NT; on the Mac, the drive is always
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79 empty (don't use the volume name -- it doesn't have the same
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80 syntactic and semantic oddities as DOS drive letters, such as there
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81 being a separate current directory per drive)."""
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82
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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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90
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91 def ismount(s):
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92 if not isabs(s):
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93 return False
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94 components = split(s)
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95 return len(components) == 2 and components[1] == ''
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96
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97 def islink(s):
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98 """Return true if the pathname refers to a symbolic link."""
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100 try:
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101 import Carbon.File
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102 return Carbon.File.ResolveAliasFile(s, 0)[2]
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103 except:
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104 return False
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106 # Is `stat`/`lstat` a meaningful difference on the Mac? This is safe in any
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107 # case.
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109 def lexists(path):
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110 """Test whether a path exists. Returns True for broken symbolic links"""
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111
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112 try:
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113 st = os.lstat(path)
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114 except os.error:
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115 return False
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116 return True
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117
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118 def expandvars(path):
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119 """Dummy to retain interface-compatibility with other operating systems."""
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120 return path
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121
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123 def expanduser(path):
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124 """Dummy to retain interface-compatibility with other operating systems."""
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125 return path
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126
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127 class norm_error(Exception):
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128 """Path cannot be normalized"""
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129
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130 def normpath(s):
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131 """Normalize a pathname. Will return the same result for
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132 equivalent paths."""
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133
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134 if ":" not in s:
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135 return ":"+s
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136
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137 comps = s.split(":")
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138 i = 1
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139 while i < len(comps)-1:
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140 if comps[i] == "" and comps[i-1] != "":
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141 if i > 1:
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142 del comps[i-1:i+1]
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143 i = i - 1
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144 else:
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145 # best way to handle this is to raise an exception
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146 raise norm_error, 'Cannot use :: immediately after volume name'
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147 else:
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148 i = i + 1
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149
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150 s = ":".join(comps)
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151
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152 # remove trailing ":" except for ":" and "Volume:"
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153 if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s):
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154 s = s[:-1]
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155 return s
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156
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157
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158 def walk(top, func, arg):
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159 """Directory tree walk with callback function.
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160
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161 For each directory in the directory tree rooted at top (including top
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162 itself, but excluding '.' and '..'), call func(arg, dirname, fnames).
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163 dirname is the name of the directory, and fnames a list of the names of
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164 the files and subdirectories in dirname (excluding '.' and '..'). func
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165 may modify the fnames list in-place (e.g. via del or slice assignment),
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166 and walk will only recurse into the subdirectories whose names remain in
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167 fnames; this can be used to implement a filter, or to impose a specific
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168 order of visiting. No semantics are defined for, or required of, arg,
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169 beyond that arg is always passed to func. It can be used, e.g., to pass
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170 a filename pattern, or a mutable object designed to accumulate
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171 statistics. Passing None for arg is common."""
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172
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173 try:
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174 names = os.listdir(top)
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175 except os.error:
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176 return
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177 func(arg, top, names)
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178 for name in names:
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179 name = join(top, name)
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180 if isdir(name) and not islink(name):
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181 walk(name, func, arg)
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182
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183
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184 def abspath(path):
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185 """Return an absolute path."""
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186 if not isabs(path):
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187 path = join(os.getcwd(), path)
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188 return normpath(path)
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189
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190 # realpath is a no-op on systems without islink support
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191 def realpath(path):
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192 path = abspath(path)
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193 try:
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194 import Carbon.File
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195 except ImportError:
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196 return path
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197 if not path:
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198 return path
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199 components = path.split(':')
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200 path = components[0] + ':'
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201 for c in components[1:]:
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202 path = join(path, c)
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203 path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
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204 return path
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205
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206 supports_unicode_filenames = False