Mercurial > hg
annotate mercurial/match.py @ 21803:62cc4055c6c8
hg: use vfs functions in clone
This change applies vfs functions in clone. destvfs.exists will invoke
os.path.lexists via lexists of vfs to check for broken symbolic links.
author | Chinmay Joshi <c@chinmayjoshi.com> |
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date | Sat, 21 Jun 2014 14:44:09 +0530 |
parents | a2f4ea82d6d3 |
children | a4b67bf1f0a5 |
rev | line source |
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Generally replace "file name" with "filename" in help and comments.
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1 # match.py - filename matching |
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2 # |
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3 # Copyright 2008, 2009 Matt Mackall <mpm@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 import re |
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9 import util, pathutil |
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10 from i18n import _ |
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12 def _rematcher(regex): |
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13 '''compile the regexp with the best available regexp engine and return a |
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14 matcher function''' |
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15 m = util.compilere(regex) |
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16 try: |
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17 # slightly faster, provided by facebook's re2 bindings |
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18 return m.test_match |
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19 except AttributeError: |
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20 return m.match |
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21 |
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22 def _expandsets(kindpats, ctx): |
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23 '''Returns the kindpats list with the 'set' patterns expanded.''' |
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24 fset = set() |
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25 other = [] |
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26 |
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27 for kind, pat in kindpats: |
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28 if kind == 'set': |
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29 if not ctx: |
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30 raise util.Abort("fileset expression with no context") |
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31 s = ctx.getfileset(pat) |
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32 fset.update(s) |
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33 continue |
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34 other.append((kind, pat)) |
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35 return fset, other |
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36 |
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37 class match(object): |
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38 def __init__(self, root, cwd, patterns, include=[], exclude=[], |
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39 default='glob', exact=False, auditor=None, ctx=None): |
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40 """build an object to match a set of file patterns |
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41 |
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42 arguments: |
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43 root - the canonical root of the tree you're matching against |
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44 cwd - the current working directory, if relevant |
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45 patterns - patterns to find |
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46 include - patterns to include (unless they are excluded) |
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47 exclude - patterns to exclude (even if they are included) |
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48 default - if a pattern in patterns has no explicit type, assume this one |
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49 exact - patterns are actually filenames (include/exclude still apply) |
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50 |
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51 a pattern is one of: |
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52 'glob:<glob>' - a glob relative to cwd |
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53 're:<regexp>' - a regular expression |
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54 'path:<path>' - a path relative to repository root |
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55 'relglob:<glob>' - an unrooted glob (*.c matches C files in all dirs) |
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56 'relpath:<path>' - a path relative to cwd |
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57 'relre:<regexp>' - a regexp that needn't match the start of a name |
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58 'set:<fileset>' - a fileset expression |
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59 '<something>' - a pattern of the specified default type |
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60 """ |
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61 |
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62 self._root = root |
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63 self._cwd = cwd |
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64 self._files = [] # exact files and roots of patterns |
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65 self._anypats = bool(include or exclude) |
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66 self._ctx = ctx |
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67 self._always = False |
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68 |
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69 if include: |
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70 kindpats = _normalize(include, 'glob', root, cwd, auditor) |
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71 self.includepat, im = _buildmatch(ctx, kindpats, '(?:/|$)') |
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72 if exclude: |
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73 kindpats = _normalize(exclude, 'glob', root, cwd, auditor) |
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74 self.excludepat, em = _buildmatch(ctx, kindpats, '(?:/|$)') |
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75 if exact: |
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76 if isinstance(patterns, list): |
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77 self._files = patterns |
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78 else: |
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79 self._files = list(patterns) |
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80 pm = self.exact |
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81 elif patterns: |
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82 kindpats = _normalize(patterns, default, root, cwd, auditor) |
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83 self._files = _roots(kindpats) |
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84 self._anypats = self._anypats or _anypats(kindpats) |
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85 self.patternspat, pm = _buildmatch(ctx, kindpats, '$') |
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86 |
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87 if patterns or exact: |
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88 if include: |
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89 if exclude: |
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90 m = lambda f: im(f) and not em(f) and pm(f) |
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91 else: |
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92 m = lambda f: im(f) and pm(f) |
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93 else: |
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94 if exclude: |
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95 m = lambda f: not em(f) and pm(f) |
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96 else: |
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97 m = pm |
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98 else: |
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99 if include: |
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100 if exclude: |
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101 m = lambda f: im(f) and not em(f) |
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102 else: |
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103 m = im |
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104 else: |
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105 if exclude: |
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106 m = lambda f: not em(f) |
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107 else: |
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108 m = lambda f: True |
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109 self._always = True |
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110 |
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111 self.matchfn = m |
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112 self._fmap = set(self._files) |
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113 |
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114 def __call__(self, fn): |
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115 return self.matchfn(fn) |
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116 def __iter__(self): |
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117 for f in self._files: |
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118 yield f |
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119 |
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120 # Callbacks related to how the matcher is used by dirstate.walk. |
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121 # Subscribers to these events must monkeypatch the matcher object. |
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122 def bad(self, f, msg): |
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123 '''Callback from dirstate.walk for each explicit file that can't be |
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124 found/accessed, with an error message.''' |
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125 pass |
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126 |
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127 # If an explicitdir is set, it will be called when an explicitly listed |
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128 # directory is visited. |
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129 explicitdir = None |
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130 |
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131 # If an traversedir is set, it will be called when a directory discovered |
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132 # by recursive traversal is visited. |
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133 traversedir = None |
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134 |
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135 def rel(self, f): |
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136 '''Convert repo path back to path that is relative to cwd of matcher.''' |
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137 return util.pathto(self._root, self._cwd, f) |
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138 |
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139 def files(self): |
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140 '''Explicitly listed files or patterns or roots: |
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141 if no patterns or .always(): empty list, |
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142 if exact: list exact files, |
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143 if not .anypats(): list all files and dirs, |
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144 else: optimal roots''' |
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145 return self._files |
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146 |
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147 def exact(self, f): |
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148 '''Returns True if f is in .files().''' |
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149 return f in self._fmap |
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150 |
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151 def anypats(self): |
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152 '''Matcher uses patterns or include/exclude.''' |
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153 return self._anypats |
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154 |
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155 def always(self): |
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156 '''Matcher will match everything and .files() will be empty |
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157 - optimization might be possible and necessary.''' |
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158 return self._always |
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160 class exact(match): |
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161 def __init__(self, root, cwd, files): |
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162 match.__init__(self, root, cwd, files, exact=True) |
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163 |
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164 class always(match): |
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165 def __init__(self, root, cwd): |
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166 match.__init__(self, root, cwd, []) |
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167 self._always = True |
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168 |
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169 class narrowmatcher(match): |
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170 """Adapt a matcher to work on a subdirectory only. |
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171 |
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172 The paths are remapped to remove/insert the path as needed: |
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173 |
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174 >>> m1 = match('root', '', ['a.txt', 'sub/b.txt']) |
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175 >>> m2 = narrowmatcher('sub', m1) |
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176 >>> bool(m2('a.txt')) |
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177 False |
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178 >>> bool(m2('b.txt')) |
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179 True |
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180 >>> bool(m2.matchfn('a.txt')) |
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181 False |
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182 >>> bool(m2.matchfn('b.txt')) |
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183 True |
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184 >>> m2.files() |
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185 ['b.txt'] |
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186 >>> m2.exact('b.txt') |
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187 True |
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188 >>> m2.rel('b.txt') |
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189 'b.txt' |
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190 >>> def bad(f, msg): |
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191 ... print "%s: %s" % (f, msg) |
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192 >>> m1.bad = bad |
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193 >>> m2.bad('x.txt', 'No such file') |
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194 sub/x.txt: No such file |
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195 """ |
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196 |
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197 def __init__(self, path, matcher): |
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198 self._root = matcher._root |
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199 self._cwd = matcher._cwd |
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200 self._path = path |
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201 self._matcher = matcher |
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202 self._always = matcher._always |
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203 |
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204 self._files = [f[len(path) + 1:] for f in matcher._files |
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205 if f.startswith(path + "/")] |
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206 self._anypats = matcher._anypats |
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207 self.matchfn = lambda fn: matcher.matchfn(self._path + "/" + fn) |
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208 self._fmap = set(self._files) |
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209 |
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210 def bad(self, f, msg): |
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211 self._matcher.bad(self._path + "/" + f, msg) |
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212 |
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213 def patkind(pattern, default=None): |
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214 '''If pattern is 'kind:pat' with a known kind, return kind.''' |
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215 return _patsplit(pattern, default)[0] |
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216 |
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217 def _patsplit(pattern, default): |
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218 """Split a string into the optional pattern kind prefix and the actual |
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219 pattern.""" |
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220 if ':' in pattern: |
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221 kind, pat = pattern.split(':', 1) |
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222 if kind in ('re', 'glob', 'path', 'relglob', 'relpath', 'relre', |
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223 'listfile', 'listfile0', 'set'): |
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224 return kind, pat |
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225 return default, pattern |
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226 |
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227 def _globre(pat): |
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228 r'''Convert an extended glob string to a regexp string. |
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229 |
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230 >>> print _globre(r'?') |
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231 . |
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232 >>> print _globre(r'*') |
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233 [^/]* |
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234 >>> print _globre(r'**') |
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235 .* |
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236 >>> print _globre(r'[a*?!^][^b][!c]') |
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237 [a*?!^][\^b][^c] |
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238 >>> print _globre(r'{a,b}') |
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239 (?:a|b) |
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240 >>> print _globre(r'.\*\?') |
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241 \.\*\? |
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242 ''' |
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243 i, n = 0, len(pat) |
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244 res = '' |
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245 group = 0 |
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246 escape = re.escape |
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247 def peek(): |
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248 return i < n and pat[i] |
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249 while i < n: |
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250 c = pat[i] |
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251 i += 1 |
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252 if c not in '*?[{},\\': |
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253 res += escape(c) |
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254 elif c == '*': |
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255 if peek() == '*': |
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256 i += 1 |
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257 res += '.*' |
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258 else: |
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259 res += '[^/]*' |
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260 elif c == '?': |
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261 res += '.' |
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262 elif c == '[': |
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263 j = i |
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264 if j < n and pat[j] in '!]': |
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265 j += 1 |
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266 while j < n and pat[j] != ']': |
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267 j += 1 |
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268 if j >= n: |
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269 res += '\\[' |
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270 else: |
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271 stuff = pat[i:j].replace('\\','\\\\') |
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272 i = j + 1 |
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273 if stuff[0] == '!': |
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274 stuff = '^' + stuff[1:] |
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275 elif stuff[0] == '^': |
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276 stuff = '\\' + stuff |
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277 res = '%s[%s]' % (res, stuff) |
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278 elif c == '{': |
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279 group += 1 |
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280 res += '(?:' |
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281 elif c == '}' and group: |
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282 res += ')' |
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283 group -= 1 |
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284 elif c == ',' and group: |
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285 res += '|' |
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286 elif c == '\\': |
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287 p = peek() |
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288 if p: |
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289 i += 1 |
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290 res += escape(p) |
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291 else: |
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292 res += escape(c) |
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293 else: |
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294 res += escape(c) |
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295 return res |
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296 |
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297 def _regex(kind, pat, globsuffix): |
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298 '''Convert a (normalized) pattern of any kind into a regular expression. |
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299 globsuffix is appended to the regexp of globs.''' |
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300 if not pat: |
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301 return '' |
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302 if kind == 're': |
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303 return pat |
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304 if kind == 'path': |
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305 return '^' + re.escape(pat) + '(?:/|$)' |
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306 if kind == 'relglob': |
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307 return '(?:|.*/)' + _globre(pat) + globsuffix |
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308 if kind == 'relpath': |
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309 return re.escape(pat) + '(?:/|$)' |
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310 if kind == 'relre': |
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311 if pat.startswith('^'): |
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312 return pat |
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313 return '.*' + pat |
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314 return _globre(pat) + globsuffix |
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315 |
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316 def _buildmatch(ctx, kindpats, globsuffix): |
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317 '''Return regexp string and a matcher function for kindpats. |
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318 globsuffix is appended to the regexp of globs.''' |
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319 fset, kindpats = _expandsets(kindpats, ctx) |
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320 if not kindpats: |
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321 return "", fset.__contains__ |
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322 |
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323 regex, mf = _buildregexmatch(kindpats, globsuffix) |
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324 if fset: |
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325 return regex, lambda f: f in fset or mf(f) |
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326 return regex, mf |
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327 |
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328 def _buildregexmatch(kindpats, globsuffix): |
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329 """Build a match function from a list of kinds and kindpats, |
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330 return regexp string and a matcher function.""" |
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331 try: |
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332 regex = '(?:%s)' % '|'.join([_regex(k, p, globsuffix) |
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333 for (k, p) in kindpats]) |
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334 if len(regex) > 20000: |
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335 raise OverflowError |
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336 return regex, _rematcher(regex) |
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337 except OverflowError: |
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338 # We're using a Python with a tiny regex engine and we |
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339 # made it explode, so we'll divide the pattern list in two |
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340 # until it works |
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341 l = len(kindpats) |
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342 if l < 2: |
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343 raise |
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344 regexa, a = _buildregexmatch(kindpats[:l//2], globsuffix) |
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345 regexb, b = _buildregexmatch(kindpats[l//2:], globsuffix) |
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346 return regex, lambda s: a(s) or b(s) |
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347 except re.error: |
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348 for k, p in kindpats: |
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349 try: |
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350 _rematcher('(?:%s)' % _regex(k, p, globsuffix)) |
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351 except re.error: |
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352 raise util.Abort(_("invalid pattern (%s): %s") % (k, p)) |
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353 raise util.Abort(_("invalid pattern")) |
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354 |
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355 def _normalize(patterns, default, root, cwd, auditor): |
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356 '''Convert 'kind:pat' from the patterns list to tuples with kind and |
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357 normalized and rooted patterns and with listfiles expanded.''' |
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358 kindpats = [] |
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359 for kind, pat in [_patsplit(p, default) for p in patterns]: |
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360 if kind in ('glob', 'relpath'): |
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361 pat = pathutil.canonpath(root, cwd, pat, auditor) |
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362 elif kind in ('relglob', 'path'): |
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363 pat = util.normpath(pat) |
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364 elif kind in ('listfile', 'listfile0'): |
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365 try: |
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366 files = util.readfile(pat) |
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367 if kind == 'listfile0': |
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368 files = files.split('\0') |
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369 else: |
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370 files = files.splitlines() |
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371 files = [f for f in files if f] |
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372 except EnvironmentError: |
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373 raise util.Abort(_("unable to read file list (%s)") % pat) |
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374 kindpats += _normalize(files, default, root, cwd, auditor) |
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375 continue |
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376 # else: re or relre - which cannot be normalized |
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377 kindpats.append((kind, pat)) |
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378 return kindpats |
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379 |
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380 def _roots(kindpats): |
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381 '''return roots and exact explicitly listed files from patterns |
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382 |
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383 >>> _roots([('glob', 'g/*'), ('glob', 'g'), ('glob', 'g*')]) |
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384 ['g', 'g', '.'] |
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385 >>> _roots([('relpath', 'r'), ('path', 'p/p'), ('path', '')]) |
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386 ['r', 'p/p', '.'] |
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387 >>> _roots([('relglob', 'rg*'), ('re', 're/'), ('relre', 'rr')]) |
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388 ['.', '.', '.'] |
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389 ''' |
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390 r = [] |
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391 for kind, pat in kindpats: |
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392 if kind == 'glob': # find the non-glob prefix |
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393 root = [] |
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394 for p in pat.split('/'): |
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395 if '[' in p or '{' in p or '*' in p or '?' in p: |
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396 break |
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397 root.append(p) |
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398 r.append('/'.join(root) or '.') |
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399 elif kind in ('relpath', 'path'): |
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400 r.append(pat or '.') |
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401 else: # relglob, re, relre |
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402 r.append('.') |
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403 return r |
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404 |
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405 def _anypats(kindpats): |
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406 for kind, pat in kindpats: |
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407 if kind in ('glob', 're', 'relglob', 'relre', 'set'): |
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408 return True |