Mercurial > cpython-lru_cache-weakref
annotate Lib/os2emxpath.py @ 79675:c0a2294de787 2.7
Issue #16199: Backport 2to3 typo fix from 3.2.
| author | Chris Jerdonek <chris.jerdonek@gmail.com> |
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| date | Thu, 11 Oct 2012 16:15:46 -0700 |
| parents | eaf8a93cdbff |
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| rev | line source |
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1 # Module 'os2emxpath' -- common operations on OS/2 pathnames |
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2 """Common pathname manipulations, OS/2 EMX version. |
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3 |
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4 Instead of importing this module directly, import os and refer to this |
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5 module as os.path. |
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6 """ |
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7 |
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8 import os |
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9 import stat |
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10 from genericpath import * |
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11 from ntpath import (expanduser, expandvars, isabs, islink, splitdrive, |
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12 splitext, split, walk) |
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13 |
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14 __all__ = ["normcase","isabs","join","splitdrive","split","splitext", |
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15 "basename","dirname","commonprefix","getsize","getmtime", |
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16 "getatime","getctime", "islink","exists","lexists","isdir","isfile", |
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17 "ismount","walk","expanduser","expandvars","normpath","abspath", |
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18 "splitunc","curdir","pardir","sep","pathsep","defpath","altsep", |
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19 "extsep","devnull","realpath","supports_unicode_filenames"] |
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20 |
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21 # strings representing various path-related bits and pieces |
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22 curdir = '.' |
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23 pardir = '..' |
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24 extsep = '.' |
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25 sep = '/' |
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26 altsep = '\\' |
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27 pathsep = ';' |
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28 defpath = '.;C:\\bin' |
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29 devnull = 'nul' |
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30 |
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31 # Normalize the case of a pathname and map slashes to backslashes. |
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32 # Other normalizations (such as optimizing '../' away) are not done |
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33 # (this is done by normpath). |
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34 |
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35 def normcase(s): |
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36 """Normalize case of pathname. |
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37 |
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38 Makes all characters lowercase and all altseps into seps.""" |
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39 return s.replace('\\', '/').lower() |
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40 |
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41 |
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42 # Join two (or more) paths. |
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43 |
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44 def join(a, *p): |
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45 """Join two or more pathname components, inserting sep as needed""" |
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46 path = a |
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47 for b in p: |
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48 if isabs(b): |
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49 path = b |
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50 elif path == '' or path[-1:] in '/\\:': |
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51 path = path + b |
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52 else: |
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53 path = path + '/' + b |
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54 return path |
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55 |
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56 |
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57 # Parse UNC paths |
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58 def splitunc(p): |
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59 """Split a pathname into UNC mount point and relative path specifiers. |
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60 |
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61 Return a 2-tuple (unc, rest); either part may be empty. |
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62 If unc is not empty, it has the form '//host/mount' (or similar |
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63 using backslashes). unc+rest is always the input path. |
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64 Paths containing drive letters never have an UNC part. |
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65 """ |
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66 if p[1:2] == ':': |
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67 return '', p # Drive letter present |
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68 firstTwo = p[0:2] |
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69 if firstTwo == '/' * 2 or firstTwo == '\\' * 2: |
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70 # is a UNC path: |
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71 # vvvvvvvvvvvvvvvvvvvv equivalent to drive letter |
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72 # \\machine\mountpoint\directories... |
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73 # directory ^^^^^^^^^^^^^^^ |
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74 normp = normcase(p) |
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75 index = normp.find('/', 2) |
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76 if index == -1: |
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77 ##raise RuntimeError, 'illegal UNC path: "' + p + '"' |
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78 return ("", p) |
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79 index = normp.find('/', index + 1) |
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80 if index == -1: |
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81 index = len(p) |
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82 return p[:index], p[index:] |
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83 return '', p |
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84 |
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85 |
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86 # Return the tail (basename) part of a path. |
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87 |
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88 def basename(p): |
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89 """Returns the final component of a pathname""" |
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90 return split(p)[1] |
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91 |
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92 |
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93 # Return the head (dirname) part of a path. |
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94 |
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95 def dirname(p): |
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96 """Returns the directory component of a pathname""" |
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97 return split(p)[0] |
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98 |
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99 |
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100 # alias exists to lexists |
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101 lexists = exists |
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Patch #941486: add os.path.lexists(). Also fix bug #940578 by using lexists in glob.glob.
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102 |
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103 |
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104 # Is a path a directory? |
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105 |
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106 # Is a path a mount point? Either a root (with or without drive letter) |
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107 # or an UNC path with at most a / or \ after the mount point. |
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108 |
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109 def ismount(path): |
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110 """Test whether a path is a mount point (defined as root of drive)""" |
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111 unc, rest = splitunc(path) |
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112 if unc: |
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113 return rest in ("", "/", "\\") |
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114 p = splitdrive(path)[1] |
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115 return len(p) == 1 and p[0] in '/\\' |
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116 |
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117 |
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118 # Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B. |
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119 |
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120 def normpath(path): |
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121 """Normalize path, eliminating double slashes, etc.""" |
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122 path = path.replace('\\', '/') |
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123 prefix, path = splitdrive(path) |
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124 while path[:1] == '/': |
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125 prefix = prefix + '/' |
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126 path = path[1:] |
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127 comps = path.split('/') |
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128 i = 0 |
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129 while i < len(comps): |
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130 if comps[i] == '.': |
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131 del comps[i] |
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132 elif comps[i] == '..' and i > 0 and comps[i-1] not in ('', '..'): |
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133 del comps[i-1:i+1] |
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134 i = i - 1 |
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135 elif comps[i] == '' and i > 0 and comps[i-1] != '': |
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136 del comps[i] |
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137 else: |
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138 i = i + 1 |
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139 # If the path is now empty, substitute '.' |
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140 if not prefix and not comps: |
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141 comps.append('.') |
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142 return prefix + '/'.join(comps) |
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143 |
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144 |
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145 # Return an absolute path. |
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146 def abspath(path): |
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147 """Return the absolute version of a path""" |
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148 if not isabs(path): |
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149 if isinstance(path, unicode): |
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150 cwd = os.getcwdu() |
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151 else: |
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152 cwd = os.getcwd() |
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153 path = join(cwd, path) |
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154 return normpath(path) |
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155 |
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156 # realpath is a no-op on systems without islink support |
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157 realpath = abspath |
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158 |
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159 supports_unicode_filenames = False |
