Mercurial > kallithea
annotate rhodecode/lib/diffs.py @ 1753:1d1ccb873d00 beta
moved soon-to-be-deleted code from vcs to rhodecode
- diff lib
- annotate highlighter
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Sun, 04 Dec 2011 23:39:32 +0200 |
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children | 5610fd9b6803 |
rev | line source |
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1753
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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) 2009-2011 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 |
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31 from itertools import tee, imap |
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32 |
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33 from mercurial.match import match |
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34 |
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35 from vcs.exceptions import VCSError |
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36 from vcs.nodes import FileNode |
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37 |
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38 def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True): |
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39 """ |
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40 Returns git style diff between given ``filenode_old`` and ``filenode_new``. |
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41 |
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42 :param ignore_whitespace: ignore whitespaces in diff |
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43 """ |
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44 |
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45 for filenode in (filenode_old, filenode_new): |
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46 if not isinstance(filenode, FileNode): |
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47 raise VCSError("Given object should be FileNode object, not %s" |
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48 % filenode.__class__) |
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49 |
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50 old_raw_id = getattr(filenode_old.changeset, 'raw_id', '0' * 40) |
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51 new_raw_id = getattr(filenode_new.changeset, 'raw_id', '0' * 40) |
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52 |
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53 repo = filenode_new.changeset.repository |
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54 vcs_gitdiff = repo._get_diff(old_raw_id, new_raw_id, filenode_new.path, |
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55 ignore_whitespace) |
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56 |
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57 return vcs_gitdiff |
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58 |
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59 |
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60 class DiffProcessor(object): |
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61 """ |
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62 Give it a unified diff and it returns a list of the files that were |
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63 mentioned in the diff together with a dict of meta information that |
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64 can be used to render it in a HTML template. |
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65 """ |
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66 _chunk_re = re.compile(r'@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)') |
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67 |
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68 def __init__(self, diff, differ='diff', format='udiff'): |
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69 """ |
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70 :param diff: a text in diff format or generator |
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71 :param format: format of diff passed, `udiff` or `gitdiff` |
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72 """ |
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73 if isinstance(diff, basestring): |
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74 diff = [diff] |
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75 |
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76 self.__udiff = diff |
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77 self.__format = format |
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78 self.adds = 0 |
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79 self.removes = 0 |
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80 |
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81 if isinstance(self.__udiff, basestring): |
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82 self.lines = iter(self.__udiff.splitlines(1)) |
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83 |
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84 elif self.__format == 'gitdiff': |
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85 udiff_copy = self.copy_iterator() |
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86 self.lines = imap(self.escaper, self._parse_gitdiff(udiff_copy)) |
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87 else: |
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88 udiff_copy = self.copy_iterator() |
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89 self.lines = imap(self.escaper, udiff_copy) |
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90 |
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91 # Select a differ. |
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92 if differ == 'difflib': |
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93 self.differ = self._highlight_line_difflib |
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94 else: |
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95 self.differ = self._highlight_line_udiff |
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96 |
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97 def escaper(self, string): |
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98 return string.replace('<', '<').replace('>', '>') |
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99 |
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100 def copy_iterator(self): |
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101 """ |
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102 make a fresh copy of generator, we should not iterate thru |
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103 an original as it's needed for repeating operations on |
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104 this instance of DiffProcessor |
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105 """ |
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106 self.__udiff, iterator_copy = tee(self.__udiff) |
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107 return iterator_copy |
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108 |
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109 def _extract_rev(self, line1, line2): |
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110 """ |
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111 Extract the filename and revision hint from a line. |
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112 """ |
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113 |
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114 try: |
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115 if line1.startswith('--- ') and line2.startswith('+++ '): |
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116 l1 = line1[4:].split(None, 1) |
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117 old_filename = l1[0].lstrip('a/') if len(l1) >= 1 else None |
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118 old_rev = l1[1] if len(l1) == 2 else 'old' |
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119 |
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120 l2 = line2[4:].split(None, 1) |
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121 new_filename = l2[0].lstrip('b/') if len(l1) >= 1 else None |
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122 new_rev = l2[1] if len(l2) == 2 else 'new' |
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123 |
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124 filename = old_filename if (old_filename != |
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125 'dev/null') else new_filename |
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126 |
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127 return filename, new_rev, old_rev |
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128 except (ValueError, IndexError): |
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129 pass |
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130 |
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131 return None, None, None |
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132 |
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133 def _parse_gitdiff(self, diffiterator): |
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134 def line_decoder(l): |
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135 if l.startswith('+') and not l.startswith('+++'): |
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136 self.adds += 1 |
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137 elif l.startswith('-') and not l.startswith('---'): |
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138 self.removes += 1 |
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139 return l.decode('utf8', 'replace') |
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140 |
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141 output = list(diffiterator) |
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142 size = len(output) |
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143 |
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144 if size == 2: |
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145 l = [] |
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146 l.extend([output[0]]) |
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147 l.extend(output[1].splitlines(1)) |
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148 return map(line_decoder, l) |
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149 elif size == 1: |
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150 return map(line_decoder, output[0].splitlines(1)) |
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151 elif size == 0: |
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152 return [] |
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153 |
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154 raise Exception('wrong size of diff %s' % size) |
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155 |
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156 def _highlight_line_difflib(self, line, next): |
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157 """ |
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158 Highlight inline changes in both lines. |
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159 """ |
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160 |
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161 if line['action'] == 'del': |
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162 old, new = line, next |
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163 else: |
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164 old, new = next, line |
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165 |
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166 oldwords = re.split(r'(\W)', old['line']) |
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167 newwords = re.split(r'(\W)', new['line']) |
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168 |
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169 sequence = difflib.SequenceMatcher(None, oldwords, newwords) |
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170 |
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171 oldfragments, newfragments = [], [] |
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172 for tag, i1, i2, j1, j2 in sequence.get_opcodes(): |
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173 oldfrag = ''.join(oldwords[i1:i2]) |
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174 newfrag = ''.join(newwords[j1:j2]) |
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175 if tag != 'equal': |
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176 if oldfrag: |
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177 oldfrag = '<del>%s</del>' % oldfrag |
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178 if newfrag: |
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179 newfrag = '<ins>%s</ins>' % newfrag |
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180 oldfragments.append(oldfrag) |
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181 newfragments.append(newfrag) |
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182 |
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183 old['line'] = "".join(oldfragments) |
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184 new['line'] = "".join(newfragments) |
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185 |
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186 def _highlight_line_udiff(self, line, next): |
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187 """ |
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188 Highlight inline changes in both lines. |
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189 """ |
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190 start = 0 |
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191 limit = min(len(line['line']), len(next['line'])) |
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192 while start < limit and line['line'][start] == next['line'][start]: |
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193 start += 1 |
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194 end = -1 |
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195 limit -= start |
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196 while -end <= limit and line['line'][end] == next['line'][end]: |
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197 end -= 1 |
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198 end += 1 |
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199 if start or end: |
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200 def do(l): |
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201 last = end + len(l['line']) |
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202 if l['action'] == 'add': |
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203 tag = 'ins' |
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204 else: |
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205 tag = 'del' |
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206 l['line'] = '%s<%s>%s</%s>%s' % ( |
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207 l['line'][:start], |
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208 tag, |
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209 l['line'][start:last], |
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210 tag, |
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211 l['line'][last:] |
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212 ) |
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213 do(line) |
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214 do(next) |
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215 |
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216 def _parse_udiff(self): |
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217 """ |
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218 Parse the diff an return data for the template. |
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219 """ |
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220 lineiter = self.lines |
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221 files = [] |
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222 try: |
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223 line = lineiter.next() |
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224 # skip first context |
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225 skipfirst = True |
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226 while 1: |
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227 # continue until we found the old file |
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228 if not line.startswith('--- '): |
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229 line = lineiter.next() |
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230 continue |
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231 |
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232 chunks = [] |
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233 filename, old_rev, new_rev = \ |
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234 self._extract_rev(line, lineiter.next()) |
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235 files.append({ |
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236 'filename': filename, |
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237 'old_revision': old_rev, |
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238 'new_revision': new_rev, |
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239 'chunks': chunks |
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240 }) |
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241 |
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242 line = lineiter.next() |
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243 while line: |
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244 match = self._chunk_re.match(line) |
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245 if not match: |
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246 break |
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247 |
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248 lines = [] |
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249 chunks.append(lines) |
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250 |
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251 old_line, old_end, new_line, new_end = \ |
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252 [int(x or 1) for x in match.groups()[:-1]] |
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253 old_line -= 1 |
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254 new_line -= 1 |
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255 context = len(match.groups()) == 5 |
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256 old_end += old_line |
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257 new_end += new_line |
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258 |
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259 if context: |
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260 if not skipfirst: |
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261 lines.append({ |
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262 'old_lineno': '...', |
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263 'new_lineno': '...', |
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264 'action': 'context', |
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265 'line': line, |
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266 }) |
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267 else: |
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268 skipfirst = False |
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269 |
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270 line = lineiter.next() |
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271 while old_line < old_end or new_line < new_end: |
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272 if line: |
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273 command, line = line[0], line[1:] |
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274 else: |
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275 command = ' ' |
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276 affects_old = affects_new = False |
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277 |
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278 # ignore those if we don't expect them |
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279 if command in '#@': |
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280 continue |
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281 elif command == '+': |
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282 affects_new = True |
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283 action = 'add' |
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284 elif command == '-': |
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285 affects_old = True |
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286 action = 'del' |
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287 else: |
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288 affects_old = affects_new = True |
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289 action = 'unmod' |
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290 |
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291 old_line += affects_old |
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292 new_line += affects_new |
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293 lines.append({ |
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294 'old_lineno': affects_old and old_line or '', |
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295 'new_lineno': affects_new and new_line or '', |
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296 'action': action, |
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297 'line': line |
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298 }) |
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299 line = lineiter.next() |
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300 |
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301 except StopIteration: |
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302 pass |
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303 |
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304 # highlight inline changes |
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305 for file in files: |
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306 for chunk in chunks: |
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307 lineiter = iter(chunk) |
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308 #first = True |
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309 try: |
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310 while 1: |
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311 line = lineiter.next() |
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312 if line['action'] != 'unmod': |
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313 nextline = lineiter.next() |
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314 if nextline['action'] == 'unmod' or \ |
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315 nextline['action'] == line['action']: |
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316 continue |
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317 self.differ(line, nextline) |
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318 except StopIteration: |
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319 pass |
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320 |
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321 return files |
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322 |
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323 def prepare(self): |
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324 """ |
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325 Prepare the passed udiff for HTML rendering. It'l return a list |
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326 of dicts |
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327 """ |
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328 return self._parse_udiff() |
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329 |
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330 def _safe_id(self, idstring): |
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331 """Make a string safe for including in an id attribute. |
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332 |
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333 The HTML spec says that id attributes 'must begin with |
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334 a letter ([A-Za-z]) and may be followed by any number |
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335 of letters, digits ([0-9]), hyphens ("-"), underscores |
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336 ("_"), colons (":"), and periods (".")'. These regexps |
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337 are slightly over-zealous, in that they remove colons |
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338 and periods unnecessarily. |
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339 |
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340 Whitespace is transformed into underscores, and then |
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341 anything which is not a hyphen or a character that |
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342 matches \w (alphanumerics and underscore) is removed. |
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343 |
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344 """ |
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345 # Transform all whitespace to underscore |
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346 idstring = re.sub(r'\s', "_", '%s' % idstring) |
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347 # Remove everything that is not a hyphen or a member of \w |
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348 idstring = re.sub(r'(?!-)\W', "", idstring).lower() |
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349 return idstring |
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350 |
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351 def raw_diff(self): |
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352 """ |
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353 Returns raw string as udiff |
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354 """ |
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355 udiff_copy = self.copy_iterator() |
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356 if self.__format == 'gitdiff': |
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357 udiff_copy = self._parse_gitdiff(udiff_copy) |
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358 return u''.join(udiff_copy) |
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359 |
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360 def as_html(self, table_class='code-difftable', line_class='line', |
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361 new_lineno_class='lineno old', old_lineno_class='lineno new', |
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362 code_class='code'): |
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363 """ |
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364 Return udiff as html table with customized css classes |
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365 """ |
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366 def _link_to_if(condition, label, url): |
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367 """ |
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368 Generates a link if condition is meet or just the label if not. |
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369 """ |
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370 |
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371 if condition: |
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372 return '''<a href="%(url)s">%(label)s</a>''' % {'url': url, |
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373 'label': label} |
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374 else: |
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375 return label |
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376 diff_lines = self.prepare() |
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377 _html_empty = True |
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378 _html = [] |
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379 _html.append('''<table class="%(table_class)s">\n''' \ |
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380 % {'table_class': table_class}) |
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381 for diff in diff_lines: |
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382 for line in diff['chunks']: |
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383 _html_empty = False |
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384 for change in line: |
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385 _html.append('''<tr class="%(line_class)s %(action)s">\n''' \ |
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386 % {'line_class': line_class, |
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387 'action': change['action']}) |
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388 anchor_old_id = '' |
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389 anchor_new_id = '' |
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390 anchor_old = "%(filename)s_o%(oldline_no)s" % \ |
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391 {'filename': self._safe_id(diff['filename']), |
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392 'oldline_no': change['old_lineno']} |
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393 anchor_new = "%(filename)s_n%(oldline_no)s" % \ |
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394 {'filename': self._safe_id(diff['filename']), |
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395 'oldline_no': change['new_lineno']} |
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396 cond_old = change['old_lineno'] != '...' and \ |
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397 change['old_lineno'] |
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398 cond_new = change['new_lineno'] != '...' and \ |
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399 change['new_lineno'] |
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400 if cond_old: |
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401 anchor_old_id = 'id="%s"' % anchor_old |
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402 if cond_new: |
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403 anchor_new_id = 'id="%s"' % anchor_new |
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404 ########################################################### |
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405 # OLD LINE NUMBER |
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406 ########################################################### |
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407 _html.append('''\t<td %(a_id)s class="%(old_lineno_cls)s">''' \ |
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408 % {'a_id': anchor_old_id, |
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409 'old_lineno_cls': old_lineno_class}) |
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410 |
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411 _html.append('''<pre>%(link)s</pre>''' \ |
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412 % {'link': |
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413 _link_to_if(cond_old, change['old_lineno'], '#%s' \ |
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414 % anchor_old)}) |
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415 _html.append('''</td>\n''') |
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416 ########################################################### |
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417 # NEW LINE NUMBER |
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418 ########################################################### |
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419 |
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420 _html.append('''\t<td %(a_id)s class="%(new_lineno_cls)s">''' \ |
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421 % {'a_id': anchor_new_id, |
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422 'new_lineno_cls': new_lineno_class}) |
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423 |
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424 _html.append('''<pre>%(link)s</pre>''' \ |
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425 % {'link': |
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426 _link_to_if(cond_new, change['new_lineno'], '#%s' \ |
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427 % anchor_new)}) |
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428 _html.append('''</td>\n''') |
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429 ########################################################### |
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430 # CODE |
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431 ########################################################### |
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432 _html.append('''\t<td class="%(code_class)s">''' \ |
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433 % {'code_class': code_class}) |
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434 _html.append('''\n\t\t<pre>%(code)s</pre>\n''' \ |
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435 % {'code': change['line']}) |
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436 _html.append('''\t</td>''') |
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437 _html.append('''\n</tr>\n''') |
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438 _html.append('''</table>''') |
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439 if _html_empty: |
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440 return None |
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Marcin Kuzminski <marcin@python-works.com>
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441 return ''.join(_html) |
1d1ccb873d00
moved soon-to-be-deleted code from vcs to rhodecode
Marcin Kuzminski <marcin@python-works.com>
parents:
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changeset
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442 |
1d1ccb873d00
moved soon-to-be-deleted code from vcs to rhodecode
Marcin Kuzminski <marcin@python-works.com>
parents:
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443 def stat(self): |
1d1ccb873d00
moved soon-to-be-deleted code from vcs to rhodecode
Marcin Kuzminski <marcin@python-works.com>
parents:
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444 """ |
1d1ccb873d00
moved soon-to-be-deleted code from vcs to rhodecode
Marcin Kuzminski <marcin@python-works.com>
parents:
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445 Returns tuple of added, and removed lines for this instance |
1d1ccb873d00
moved soon-to-be-deleted code from vcs to rhodecode
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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446 """ |
1d1ccb873d00
moved soon-to-be-deleted code from vcs to rhodecode
Marcin Kuzminski <marcin@python-works.com>
parents:
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447 return self.adds, self.removes |