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annotate rhodecode/lib/diffs.py @ 2016:6020e3884a58 beta

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implements #212 moved default encoding variable into rhodecode-config. It's now possible to change default utf8 to some other encoding. - also added instance-id to config - update ini files
author Marcin Kuzminski <marcin@python-works.com>
date Wed, 22 Feb 2012 04:30:26 +0200
parents 324ac367a4da
children feb0fccdcf83
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # -*- coding: utf-8 -*-
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2 """
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3 rhodecode.lib.diffs
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4 ~~~~~~~~~~~~~~~~~~~
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5
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6 Set of diffing helpers, previously part of vcs
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7
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8
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9 :created_on: Dec 4, 2011
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10 :author: marcink
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11 :copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>
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12 :original copyright: 2007-2008 by Armin Ronacher
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13 :license: GPLv3, see COPYING for more details.
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14 """
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15 # This program is free software: you can redistribute it and/or modify
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16 # it under the terms of the GNU General Public License as published by
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17 # the Free Software Foundation, either version 3 of the License, or
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18 # (at your option) any later version.
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19 #
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20 # This program is distributed in the hope that it will be useful,
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21 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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22 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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23 # GNU General Public License for more details.
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24 #
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25 # You should have received a copy of the GNU General Public License
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26 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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27
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28 import re
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29 import difflib
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30 import markupsafe
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31 from itertools import tee, imap
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32
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33 from pylons.i18n.translation import _
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34
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35 from rhodecode.lib.vcs.exceptions import VCSError
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36 from rhodecode.lib.vcs.nodes import FileNode
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37
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38 from rhodecode.lib.utils import EmptyChangeset
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39
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40
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41 def wrap_to_table(str_):
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42 return '''<table class="code-difftable">
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43 <tr class="line no-comment">
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44 <td class="lineno new"></td>
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45 <td class="code no-comment"><pre>%s</pre></td>
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46 </tr>
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47 </table>''' % str_
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48
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49
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50 def wrapped_diff(filenode_old, filenode_new, cut_off_limit=None,
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51 ignore_whitespace=True, line_context=3,
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52 enable_comments=False):
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53 """
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54 returns a wrapped diff into a table, checks for cut_off_limit and presents
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55 proper message
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56 """
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57
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58 if filenode_old is None:
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59 filenode_old = FileNode(filenode_new.path, '', EmptyChangeset())
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60
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61 if filenode_old.is_binary or filenode_new.is_binary:
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62 diff = wrap_to_table(_('binary file'))
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63 stats = (0, 0)
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64 size = 0
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65
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66 elif cut_off_limit != -1 and (cut_off_limit is None or
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67 (filenode_old.size < cut_off_limit and filenode_new.size < cut_off_limit)):
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68
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69 f_gitdiff = get_gitdiff(filenode_old, filenode_new,
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70 ignore_whitespace=ignore_whitespace,
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71 context=line_context)
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72 diff_processor = DiffProcessor(f_gitdiff, format='gitdiff')
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73
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74 diff = diff_processor.as_html(enable_comments=enable_comments)
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75 stats = diff_processor.stat()
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76 size = len(diff or '')
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77 else:
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78 diff = wrap_to_table(_('Changeset was to big and was cut off, use '
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79 'diff menu to display this diff'))
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80 stats = (0, 0)
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81 size = 0
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82
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83 if not diff:
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84 diff = wrap_to_table(_('No changes detected'))
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85
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86 cs1 = filenode_old.last_changeset.raw_id
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87 cs2 = filenode_new.last_changeset.raw_id
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88
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89 return size, cs1, cs2, diff, stats
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90
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91
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92 def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True, context=3):
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93 """
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94 Returns git style diff between given ``filenode_old`` and ``filenode_new``.
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95
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96 :param ignore_whitespace: ignore whitespaces in diff
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97 """
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98 # make sure we pass in default context
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99 context = context or 3
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100
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101 for filenode in (filenode_old, filenode_new):
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102 if not isinstance(filenode, FileNode):
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103 raise VCSError("Given object should be FileNode object, not %s"
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104 % filenode.__class__)
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105
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106 repo = filenode_new.changeset.repository
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107 old_raw_id = getattr(filenode_old.changeset, 'raw_id', repo.EMPTY_CHANGESET)
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108 new_raw_id = getattr(filenode_new.changeset, 'raw_id', repo.EMPTY_CHANGESET)
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109
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110 vcs_gitdiff = repo.get_diff(old_raw_id, new_raw_id, filenode_new.path,
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111 ignore_whitespace, context)
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112
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113 return vcs_gitdiff
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115
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116 class DiffProcessor(object):
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117 """
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118 Give it a unified diff and it returns a list of the files that were
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119 mentioned in the diff together with a dict of meta information that
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120 can be used to render it in a HTML template.
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121 """
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122 _chunk_re = re.compile(r'@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)')
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123
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124 def __init__(self, diff, differ='diff', format='udiff'):
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125 """
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126 :param diff: a text in diff format or generator
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127 :param format: format of diff passed, `udiff` or `gitdiff`
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128 """
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129 if isinstance(diff, basestring):
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130 diff = [diff]
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131
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132 self.__udiff = diff
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133 self.__format = format
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134 self.adds = 0
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135 self.removes = 0
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136
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137 if isinstance(self.__udiff, basestring):
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138 self.lines = iter(self.__udiff.splitlines(1))
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139
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140 elif self.__format == 'gitdiff':
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141 udiff_copy = self.copy_iterator()
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142 self.lines = imap(self.escaper, self._parse_gitdiff(udiff_copy))
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143 else:
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144 udiff_copy = self.copy_iterator()
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145 self.lines = imap(self.escaper, udiff_copy)
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146
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147 # Select a differ.
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148 if differ == 'difflib':
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149 self.differ = self._highlight_line_difflib
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150 else:
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151 self.differ = self._highlight_line_udiff
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152
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153 def escaper(self, string):
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154 return markupsafe.escape(string)
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155
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156 def copy_iterator(self):
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157 """
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158 make a fresh copy of generator, we should not iterate thru
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159 an original as it's needed for repeating operations on
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160 this instance of DiffProcessor
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161 """
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162 self.__udiff, iterator_copy = tee(self.__udiff)
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163 return iterator_copy
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164
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165 def _extract_rev(self, line1, line2):
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166 """
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167 Extract the filename and revision hint from a line.
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168 """
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169
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170 try:
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171 if line1.startswith('--- ') and line2.startswith('+++ '):
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172 l1 = line1[4:].split(None, 1)
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173 old_filename = (l1[0].replace('a/', '', 1)
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174 if len(l1) >= 1 else None)
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175 old_rev = l1[1] if len(l1) == 2 else 'old'
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176
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177 l2 = line2[4:].split(None, 1)
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178 new_filename = (l2[0].replace('b/', '', 1)
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179 if len(l1) >= 1 else None)
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180 new_rev = l2[1] if len(l2) == 2 else 'new'
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181
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182 filename = (old_filename
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183 if old_filename != '/dev/null' else new_filename)
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184
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185 return filename, new_rev, old_rev
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186 except (ValueError, IndexError):
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187 pass
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188
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189 return None, None, None
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190
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191 def _parse_gitdiff(self, diffiterator):
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192 def line_decoder(l):
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193 if l.startswith('+') and not l.startswith('+++'):
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194 self.adds += 1
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195 elif l.startswith('-') and not l.startswith('---'):
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196 self.removes += 1
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197 return l.decode('utf8', 'replace')
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198
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199 output = list(diffiterator)
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200 size = len(output)
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201
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202 if size == 2:
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203 l = []
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204 l.extend([output[0]])
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205 l.extend(output[1].splitlines(1))
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206 return map(line_decoder, l)
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207 elif size == 1:
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208 return map(line_decoder, output[0].splitlines(1))
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209 elif size == 0:
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210 return []
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211
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212 raise Exception('wrong size of diff %s' % size)
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213
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214 def _highlight_line_difflib(self, line, next_):
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215 """
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216 Highlight inline changes in both lines.
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217 """
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218
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219 if line['action'] == 'del':
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220 old, new = line, next_
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221 else:
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222 old, new = next_, line
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223
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224 oldwords = re.split(r'(\W)', old['line'])
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225 newwords = re.split(r'(\W)', new['line'])
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226
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227 sequence = difflib.SequenceMatcher(None, oldwords, newwords)
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228
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229 oldfragments, newfragments = [], []
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230 for tag, i1, i2, j1, j2 in sequence.get_opcodes():
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231 oldfrag = ''.join(oldwords[i1:i2])
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232 newfrag = ''.join(newwords[j1:j2])
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233 if tag != 'equal':
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234 if oldfrag:
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235 oldfrag = '<del>%s</del>' % oldfrag
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236 if newfrag:
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237 newfrag = '<ins>%s</ins>' % newfrag
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238 oldfragments.append(oldfrag)
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239 newfragments.append(newfrag)
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240
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241 old['line'] = "".join(oldfragments)
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242 new['line'] = "".join(newfragments)
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243
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244 def _highlight_line_udiff(self, line, next_):
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245 """
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246 Highlight inline changes in both lines.
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247 """
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248 start = 0
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249 limit = min(len(line['line']), len(next_['line']))
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250 while start < limit and line['line'][start] == next_['line'][start]:
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251 start += 1
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252 end = -1
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253 limit -= start
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254 while -end <= limit and line['line'][end] == next_['line'][end]:
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255 end -= 1
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256 end += 1
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257 if start or end:
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258 def do(l):
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259 last = end + len(l['line'])
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260 if l['action'] == 'add':
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261 tag = 'ins'
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262 else:
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263 tag = 'del'
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264 l['line'] = '%s<%s>%s</%s>%s' % (
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265 l['line'][:start],
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266 tag,
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267 l['line'][start:last],
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268 tag,
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269 l['line'][last:]
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270 )
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271 do(line)
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272 do(next_)
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273
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274 def _parse_udiff(self):
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275 """
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276 Parse the diff an return data for the template.
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277 """
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278 lineiter = self.lines
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279 files = []
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280 try:
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281 line = lineiter.next()
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282 # skip first context
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283 skipfirst = True
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284 while 1:
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285 # continue until we found the old file
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286 if not line.startswith('--- '):
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287 line = lineiter.next()
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288 continue
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289
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290 chunks = []
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291 filename, old_rev, new_rev = \
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292 self._extract_rev(line, lineiter.next())
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293 files.append({
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294 'filename': filename,
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295 'old_revision': old_rev,
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296 'new_revision': new_rev,
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297 'chunks': chunks
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298 })
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299
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300 line = lineiter.next()
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301 while line:
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302 match = self._chunk_re.match(line)
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303 if not match:
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304 break
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305
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306 lines = []
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307 chunks.append(lines)
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308
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309 old_line, old_end, new_line, new_end = \
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310 [int(x or 1) for x in match.groups()[:-1]]
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311 old_line -= 1
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312 new_line -= 1
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313 context = len(match.groups()) == 5
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314 old_end += old_line
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315 new_end += new_line
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316
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317 if context:
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318 if not skipfirst:
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319 lines.append({
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320 'old_lineno': '...',
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321 'new_lineno': '...',
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322 'action': 'context',
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323 'line': line,
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324 })
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325 else:
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326 skipfirst = False
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327
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328 line = lineiter.next()
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329 while old_line < old_end or new_line < new_end:
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330 if line:
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331 command, line = line[0], line[1:]
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332 else:
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333 command = ' '
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334 affects_old = affects_new = False
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335
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336 # ignore those if we don't expect them
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337 if command in '#@':
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338 continue
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339 elif command == '+':
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340 affects_new = True
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341 action = 'add'
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342 elif command == '-':
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343 affects_old = True
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344 action = 'del'
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345 else:
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346 affects_old = affects_new = True
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347 action = 'unmod'
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348
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349 old_line += affects_old
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350 new_line += affects_new
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351 lines.append({
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352 'old_lineno': affects_old and old_line or '',
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353 'new_lineno': affects_new and new_line or '',
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354 'action': action,
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355 'line': line
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356 })
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357 line = lineiter.next()
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358
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359 except StopIteration:
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360 pass
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361
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362 # highlight inline changes
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363 for _ in files:
1753
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364 for chunk in chunks:
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365 lineiter = iter(chunk)
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366 #first = True
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367 try:
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368 while 1:
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369 line = lineiter.next()
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370 if line['action'] != 'unmod':
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371 nextline = lineiter.next()
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372 if nextline['action'] == 'unmod' or \
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373 nextline['action'] == line['action']:
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374 continue
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375 self.differ(line, nextline)
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376 except StopIteration:
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377 pass
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378
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379 return files
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380
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381 def prepare(self):
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382 """
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383 Prepare the passed udiff for HTML rendering. It'l return a list
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384 of dicts
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385 """
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386 return self._parse_udiff()
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387
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388 def _safe_id(self, idstring):
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389 """Make a string safe for including in an id attribute.
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390
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391 The HTML spec says that id attributes 'must begin with
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392 a letter ([A-Za-z]) and may be followed by any number
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393 of letters, digits ([0-9]), hyphens ("-"), underscores
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394 ("_"), colons (":"), and periods (".")'. These regexps
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395 are slightly over-zealous, in that they remove colons
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396 and periods unnecessarily.
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397
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398 Whitespace is transformed into underscores, and then
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399 anything which is not a hyphen or a character that
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400 matches \w (alphanumerics and underscore) is removed.
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401
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402 """
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403 # Transform all whitespace to underscore
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404 idstring = re.sub(r'\s', "_", '%s' % idstring)
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405 # Remove everything that is not a hyphen or a member of \w
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406 idstring = re.sub(r'(?!-)\W', "", idstring).lower()
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407 return idstring
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408
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409 def raw_diff(self):
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410 """
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411 Returns raw string as udiff
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412 """
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413 udiff_copy = self.copy_iterator()
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414 if self.__format == 'gitdiff':
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415 udiff_copy = self._parse_gitdiff(udiff_copy)
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416 return u''.join(udiff_copy)
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417
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418 def as_html(self, table_class='code-difftable', line_class='line',
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419 new_lineno_class='lineno old', old_lineno_class='lineno new',
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420 code_class='code', enable_comments=False):
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421 """
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422 Return udiff as html table with customized css classes
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423 """
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424 def _link_to_if(condition, label, url):
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425 """
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426 Generates a link if condition is meet or just the label if not.
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427 """
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428
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429 if condition:
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430 return '''<a href="%(url)s">%(label)s</a>''' % {
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431 'url': url,
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432 'label': label
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433 }
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434 else:
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435 return label
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436 diff_lines = self.prepare()
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437 _html_empty = True
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438 _html = []
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439 _html.append('''<table class="%(table_class)s">\n''' % {
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440 'table_class': table_class
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441 })
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442 for diff in diff_lines:
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443 for line in diff['chunks']:
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444 _html_empty = False
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445 for change in line:
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446 _html.append('''<tr class="%(lc)s %(action)s">\n''' % {
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447 'lc': line_class,
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448 'action': change['action']
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449 })
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450 anchor_old_id = ''
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451 anchor_new_id = ''
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452 anchor_old = "%(filename)s_o%(oldline_no)s" % {
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453 'filename': self._safe_id(diff['filename']),
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454 'oldline_no': change['old_lineno']
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455 }
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456 anchor_new = "%(filename)s_n%(oldline_no)s" % {
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457 'filename': self._safe_id(diff['filename']),
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458 'oldline_no': change['new_lineno']
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459 }
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460 cond_old = (change['old_lineno'] != '...' and
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461 change['old_lineno'])
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462 cond_new = (change['new_lineno'] != '...' and
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463 change['new_lineno'])
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464 if cond_old:
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465 anchor_old_id = 'id="%s"' % anchor_old
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466 if cond_new:
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467 anchor_new_id = 'id="%s"' % anchor_new
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468 ###########################################################
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469 # OLD LINE NUMBER
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470 ###########################################################
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471 _html.append('''\t<td %(a_id)s class="%(olc)s">''' % {
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472 'a_id': anchor_old_id,
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473 'olc': old_lineno_class
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474 })
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475
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476 _html.append('''%(link)s''' % {
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477 'link': _link_to_if(True, change['old_lineno'],
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478 '#%s' % anchor_old)
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479 })
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480 _html.append('''</td>\n''')
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481 ###########################################################
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482 # NEW LINE NUMBER
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483 ###########################################################
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484
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485 _html.append('''\t<td %(a_id)s class="%(nlc)s">''' % {
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486 'a_id': anchor_new_id,
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487 'nlc': new_lineno_class
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488 })
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489
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490 _html.append('''%(link)s''' % {
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491 'link': _link_to_if(True, change['new_lineno'],
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492 '#%s' % anchor_new)
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493 })
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494 _html.append('''</td>\n''')
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495 ###########################################################
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496 # CODE
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497 ###########################################################
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498 comments = '' if enable_comments else 'no-comment'
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499 _html.append('''\t<td class="%(cc)s %(inc)s">''' % {
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500 'cc': code_class,
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501 'inc': comments
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502 })
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503 _html.append('''\n\t\t<pre>%(code)s</pre>\n''' % {
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504 'code': change['line']
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505 })
1753
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506 _html.append('''\t</td>''')
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507 _html.append('''\n</tr>\n''')
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508 _html.append('''</table>''')
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509 if _html_empty:
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510 return None
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511 return ''.join(_html)
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512
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513 def stat(self):
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514 """
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515 Returns tuple of added, and removed lines for this instance
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516 """
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517 return self.adds, self.removes