Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/glob2/impl.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 """Filename globbing utility."""
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2
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3 from __future__ import absolute_import
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4
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5 import sys
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6 import os
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7 import re
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8 from . import fnmatch
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9
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10
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11 class Globber(object):
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12
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13 listdir = staticmethod(os.listdir)
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14 isdir = staticmethod(os.path.isdir)
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15 islink = staticmethod(os.path.islink)
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16 exists = staticmethod(os.path.lexists)
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17
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18 def walk(self, top, followlinks=False):
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19 """A simplified version of os.walk (code copied) that uses
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20 ``self.listdir``, and the other local filesystem methods.
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21
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22 Because we don't care about file/directory distinctions, only
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23 a single list is returned.
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24 """
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25 try:
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26 names = self.listdir(top)
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27 except os.error as err:
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28 return
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29
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30 items = []
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31 for name in names:
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32 items.append(name)
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33
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34 yield top, items
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35
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36 for name in items:
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37 new_path = os.path.join(top, name)
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38 if followlinks or not self.islink(new_path):
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39 for x in self.walk(new_path, followlinks):
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40 yield x
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41
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42 def glob(self, pathname, with_matches=False):
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43 """Return a list of paths matching a pathname pattern.
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44
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45 The pattern may contain simple shell-style wildcards a la
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46 fnmatch. However, unlike fnmatch, filenames starting with a
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47 dot are special cases that are not matched by '*' and '?'
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48 patterns.
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49
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50 """
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51 return list(self.iglob(pathname, with_matches))
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52
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53 def iglob(self, pathname, with_matches=False):
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54 """Return an iterator which yields the paths matching a pathname
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55 pattern.
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56
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57 The pattern may contain simple shell-style wildcards a la
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58 fnmatch. However, unlike fnmatch, filenames starting with a
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59 dot are special cases that are not matched by '*' and '?'
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60 patterns.
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61
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62 If ``with_matches`` is True, then for each matching path
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63 a 2-tuple will be returned; the second element if the tuple
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64 will be a list of the parts of the path that matched the individual
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65 wildcards.
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66 """
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67 result = self._iglob(pathname)
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68 if with_matches:
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69 return result
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70 return map(lambda s: s[0], result)
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71
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72 def _iglob(self, pathname, rootcall=True):
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73 """Internal implementation that backs :meth:`iglob`.
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74
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75 ``rootcall`` is required to differentiate between the user's call to
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76 iglob(), and subsequent recursive calls, for the purposes of resolving
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77 certain special cases of ** wildcards. Specifically, "**" is supposed
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78 to include the current directory for purposes of globbing, but the
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79 directory itself should never be returned. So if ** is the lastmost
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80 part of the ``pathname`` given the user to the root call, we want to
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81 ignore the current directory. For this, we need to know which the root
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82 call is.
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83 """
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84
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85 # Short-circuit if no glob magic
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86 if not has_magic(pathname):
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87 if self.exists(pathname):
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88 yield pathname, ()
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89 return
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90
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91 # If no directory part is left, assume the working directory
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92 dirname, basename = os.path.split(pathname)
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93
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94 # If the directory is globbed, recurse to resolve.
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95 # If at this point there is no directory part left, we simply
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96 # continue with dirname="", which will search the current dir.
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97 # `os.path.split()` returns the argument itself as a dirname if it is a
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98 # drive or UNC path. Prevent an infinite recursion if a drive or UNC path
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99 # contains magic characters (i.e. r'\\?\C:').
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100 if dirname != pathname and has_magic(dirname):
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101 # Note that this may return files, which will be ignored
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102 # later when we try to use them as directories.
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103 # Prefiltering them here would only require more IO ops.
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104 dirs = self._iglob(dirname, rootcall=False)
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105 else:
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106 dirs = [(dirname, ())]
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107
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108 # Resolve ``basename`` expr for every directory found
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109 for dirname, dir_groups in dirs:
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110 for name, groups in self.resolve_pattern(
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111 dirname, basename, not rootcall):
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112 yield os.path.join(dirname, name), dir_groups + groups
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113
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114 def resolve_pattern(self, dirname, pattern, globstar_with_root):
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115 """Apply ``pattern`` (contains no path elements) to the
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116 literal directory`` in dirname``.
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117
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118 If pattern=='', this will filter for directories. This is
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119 a special case that happens when the user's glob expression ends
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120 with a slash (in which case we only want directories). It simpler
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121 and faster to filter here than in :meth:`_iglob`.
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122 """
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123
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124 if sys.version_info[0] == 3:
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125 if isinstance(pattern, bytes):
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126 dirname = bytes(os.curdir, 'ASCII')
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127 else:
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128 if isinstance(pattern, unicode) and not isinstance(dirname, unicode):
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129 dirname = unicode(dirname, sys.getfilesystemencoding() or
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130 sys.getdefaultencoding())
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131
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132 # If no magic, short-circuit, only check for existence
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133 if not has_magic(pattern):
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134 if pattern == '':
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135 if self.isdir(dirname):
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136 return [(pattern, ())]
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137 else:
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138 if self.exists(os.path.join(dirname, pattern)):
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139 return [(pattern, ())]
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140 return []
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141
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142 if not dirname:
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143 dirname = os.curdir
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144
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145 try:
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146 if pattern == '**':
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147 # Include the current directory in **, if asked; by adding
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148 # an empty string as opposed to '.', be spare ourselves
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149 # having to deal with os.path.normpath() later.
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150 names = [''] if globstar_with_root else []
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151 for top, entries in self.walk(dirname):
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152 _mkabs = lambda s: os.path.join(top[len(dirname)+1:], s)
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153 names.extend(map(_mkabs, entries))
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154 # Reset pattern so that fnmatch(), which does not understand
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155 # ** specifically, will only return a single group match.
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156 pattern = '*'
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157 else:
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158 names = self.listdir(dirname)
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159 except os.error:
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160 return []
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161
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162 if not _ishidden(pattern):
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163 # Remove hidden files by default, but take care to ensure
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164 # that the empty string we may have added earlier remains.
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165 # Do not filter out the '' that we might have added earlier
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166 names = filter(lambda x: not x or not _ishidden(x), names)
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167 return fnmatch.filter(names, pattern)
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168
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169
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170 default_globber = Globber()
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171 glob = default_globber.glob
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172 iglob = default_globber.iglob
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173 del default_globber
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174
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175
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176 magic_check = re.compile('[*?[]')
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177 magic_check_bytes = re.compile(b'[*?[]')
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178
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179 def has_magic(s):
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180 if isinstance(s, bytes):
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181 match = magic_check_bytes.search(s)
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182 else:
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183 match = magic_check.search(s)
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184 return match is not None
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185
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186 def _ishidden(path):
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187 return path[0] in ('.', b'.'[0])