Mercurial > kallithea

annotate rhodecode/lib/vcs/utils/diffs.py @ 3146:c5169e445fb8 beta

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Full IP restrictions enabled - short cache query for IP for performance - remove redundant logic - some small css fixes for login form to better show IP restricted message
author Marcin Kuzminski <marcin@python-works.com>
date Fri, 04 Jan 2013 23:34:53 +0100
parents ab75def5c15d
children d7488551578e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2007
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1 # -*- coding: utf-8 -*-
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2 # original copyright: 2007-2008 by Armin Ronacher
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3 # licensed under the BSD license.
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4
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5 import re
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6 import difflib
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7 import logging
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8
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9 from difflib import unified_diff
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10 from itertools import tee, imap
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11
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12 from mercurial.match import match
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13
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14 from rhodecode.lib.vcs.exceptions import VCSError
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15 from rhodecode.lib.vcs.nodes import FileNode, NodeError
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16 from rhodecode.lib.vcs.utils import safe_unicode
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17
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18
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19 def get_udiff(filenode_old, filenode_new, show_whitespace=True):
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20 """
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21 Returns unified diff between given ``filenode_old`` and ``filenode_new``.
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22 """
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23 try:
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24 filenode_old_date = filenode_old.changeset.date
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25 except NodeError:
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26 filenode_old_date = None
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27
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28 try:
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29 filenode_new_date = filenode_new.changeset.date
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30 except NodeError:
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31 filenode_new_date = None
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32
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33 for filenode in (filenode_old, filenode_new):
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34 if not isinstance(filenode, FileNode):
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35 raise VCSError("Given object should be FileNode object, not %s"
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36 % filenode.__class__)
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37
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38 if filenode_old_date and filenode_new_date:
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39 if not filenode_old_date < filenode_new_date:
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40 logging.debug("Generating udiff for filenodes with not increasing "
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41 "dates")
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42
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43 vcs_udiff = unified_diff(filenode_old.content.splitlines(True),
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44 filenode_new.content.splitlines(True),
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45 filenode_old.name,
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46 filenode_new.name,
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47 filenode_old_date,
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48 filenode_old_date)
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49 return vcs_udiff
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50
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51
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52 def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True):
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53 """
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54 Returns git style diff between given ``filenode_old`` and ``filenode_new``.
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55
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56 :param ignore_whitespace: ignore whitespaces in diff
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57 """
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58
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59 for filenode in (filenode_old, filenode_new):
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60 if not isinstance(filenode, FileNode):
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61 raise VCSError("Given object should be FileNode object, not %s"
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62 % filenode.__class__)
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63
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64 old_raw_id = getattr(filenode_old.changeset, 'raw_id', '0' * 40)
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65 new_raw_id = getattr(filenode_new.changeset, 'raw_id', '0' * 40)
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66
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67 repo = filenode_new.changeset.repository
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68 vcs_gitdiff = repo._get_diff(old_raw_id, new_raw_id, filenode_new.path,
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69 ignore_whitespace)
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70
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71 return vcs_gitdiff
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72
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73
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74 class DiffProcessor(object):
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75 """
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76 Give it a unified diff and it returns a list of the files that were
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77 mentioned in the diff together with a dict of meta information that
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78 can be used to render it in a HTML template.
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79 """
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80 _chunk_re = re.compile(r'@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)')
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81
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82 def __init__(self, diff, differ='diff', format='udiff'):
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83 """
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84 :param diff: a text in diff format or generator
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85 :param format: format of diff passed, `udiff` or `gitdiff`
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86 """
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87 if isinstance(diff, basestring):
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88 diff = [diff]
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89
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90 self.__udiff = diff
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91 self.__format = format
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92 self.adds = 0
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93 self.removes = 0
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94
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95 if isinstance(self.__udiff, basestring):
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96 self.lines = iter(self.__udiff.splitlines(1))
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97
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98 elif self.__format == 'gitdiff':
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99 udiff_copy = self.copy_iterator()
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100 self.lines = imap(self.escaper, self._parse_gitdiff(udiff_copy))
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101 else:
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102 udiff_copy = self.copy_iterator()
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103 self.lines = imap(self.escaper, udiff_copy)
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104
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105 # Select a differ.
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106 if differ == 'difflib':
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107 self.differ = self._highlight_line_difflib
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108 else:
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109 self.differ = self._highlight_line_udiff
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110
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111 def escaper(self, string):
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112 return string.replace('<', '&lt;').replace('>', '&gt;')
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113
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114 def copy_iterator(self):
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115 """
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116 make a fresh copy of generator, we should not iterate thru
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117 an original as it's needed for repeating operations on
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118 this instance of DiffProcessor
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119 """
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120 self.__udiff, iterator_copy = tee(self.__udiff)
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121 return iterator_copy
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122
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123 def _extract_rev(self, line1, line2):
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124 """
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125 Extract the filename and revision hint from a line.
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126 """
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127
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128 try:
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129 if line1.startswith('--- ') and line2.startswith('+++ '):
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130 l1 = line1[4:].split(None, 1)
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131 old_filename = l1[0].lstrip('a/') if len(l1) >= 1 else None
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132 old_rev = l1[1] if len(l1) == 2 else 'old'
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133
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134 l2 = line2[4:].split(None, 1)
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135 new_filename = l2[0].lstrip('b/') if len(l1) >= 1 else None
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136 new_rev = l2[1] if len(l2) == 2 else 'new'
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137
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138 filename = old_filename if (old_filename !=
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139 'dev/null') else new_filename
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140
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141 return filename, new_rev, old_rev
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142 except (ValueError, IndexError):
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143 pass
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144
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145 return None, None, None
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146
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147 def _parse_gitdiff(self, diffiterator):
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148 def line_decoder(l):
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149 if l.startswith('+') and not l.startswith('+++'):
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150 self.adds += 1
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151 elif l.startswith('-') and not l.startswith('---'):
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152 self.removes += 1
2843
ab75def5c15d fixes #567 diff non-unicode encoding missmatch
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153 return safe_unicode(l)
2007
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154
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155 output = list(diffiterator)
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156 size = len(output)
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157
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158 if size == 2:
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159 l = []
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160 l.extend([output[0]])
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161 l.extend(output[1].splitlines(1))
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162 return map(line_decoder, l)
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163 elif size == 1:
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164 return map(line_decoder, output[0].splitlines(1))
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165 elif size == 0:
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166 return []
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167
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168 raise Exception('wrong size of diff %s' % size)
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169
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170 def _highlight_line_difflib(self, line, next):
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171 """
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172 Highlight inline changes in both lines.
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173 """
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174
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175 if line['action'] == 'del':
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176 old, new = line, next
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177 else:
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178 old, new = next, line
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179
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180 oldwords = re.split(r'(\W)', old['line'])
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181 newwords = re.split(r'(\W)', new['line'])
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182
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183 sequence = difflib.SequenceMatcher(None, oldwords, newwords)
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184
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185 oldfragments, newfragments = [], []
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186 for tag, i1, i2, j1, j2 in sequence.get_opcodes():
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187 oldfrag = ''.join(oldwords[i1:i2])
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188 newfrag = ''.join(newwords[j1:j2])
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189 if tag != 'equal':
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190 if oldfrag:
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191 oldfrag = '<del>%s</del>' % oldfrag
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192 if newfrag:
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193 newfrag = '<ins>%s</ins>' % newfrag
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194 oldfragments.append(oldfrag)
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195 newfragments.append(newfrag)
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196
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197 old['line'] = "".join(oldfragments)
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198 new['line'] = "".join(newfragments)
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199
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200 def _highlight_line_udiff(self, line, next):
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201 """
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202 Highlight inline changes in both lines.
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203 """
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204 start = 0
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205 limit = min(len(line['line']), len(next['line']))
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206 while start < limit and line['line'][start] == next['line'][start]:
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207 start += 1
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208 end = -1
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209 limit -= start
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210 while -end <= limit and line['line'][end] == next['line'][end]:
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211 end -= 1
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212 end += 1
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213 if start or end:
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214 def do(l):
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215 last = end + len(l['line'])
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216 if l['action'] == 'add':
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217 tag = 'ins'
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218 else:
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219 tag = 'del'
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220 l['line'] = '%s<%s>%s</%s>%s' % (
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221 l['line'][:start],
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222 tag,
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223 l['line'][start:last],
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224 tag,
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225 l['line'][last:]
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226 )
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227 do(line)
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228 do(next)
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229
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230 def _parse_udiff(self):
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231 """
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232 Parse the diff an return data for the template.
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233 """
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234 lineiter = self.lines
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235 files = []
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236 try:
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237 line = lineiter.next()
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238 # skip first context
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239 skipfirst = True
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240 while 1:
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241 # continue until we found the old file
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242 if not line.startswith('--- '):
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243 line = lineiter.next()
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244 continue
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245
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246 chunks = []
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247 filename, old_rev, new_rev = \
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248 self._extract_rev(line, lineiter.next())
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249 files.append({
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250 'filename': filename,
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251 'old_revision': old_rev,
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252 'new_revision': new_rev,
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253 'chunks': chunks
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254 })
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255
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256 line = lineiter.next()
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257 while line:
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258 match = self._chunk_re.match(line)
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259 if not match:
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260 break
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261
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262 lines = []
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263 chunks.append(lines)
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264
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265 old_line, old_end, new_line, new_end = \
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266 [int(x or 1) for x in match.groups()[:-1]]
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267 old_line -= 1
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268 new_line -= 1
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269 context = len(match.groups()) == 5
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270 old_end += old_line
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271 new_end += new_line
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272
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273 if context:
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274 if not skipfirst:
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275 lines.append({
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276 'old_lineno': '...',
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277 'new_lineno': '...',
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278 'action': 'context',
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279 'line': line,
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280 })
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281 else:
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282 skipfirst = False
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283
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284 line = lineiter.next()
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285 while old_line < old_end or new_line < new_end:
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286 if line:
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287 command, line = line[0], line[1:]
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288 else:
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289 command = ' '
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290 affects_old = affects_new = False
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291
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292 # ignore those if we don't expect them
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293 if command in '#@':
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294 continue
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295 elif command == '+':
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296 affects_new = True
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297 action = 'add'
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298 elif command == '-':
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299 affects_old = True
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300 action = 'del'
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301 else:
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302 affects_old = affects_new = True
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303 action = 'unmod'
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304
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305 old_line += affects_old
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306 new_line += affects_new
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307 lines.append({
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308 'old_lineno': affects_old and old_line or '',
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309 'new_lineno': affects_new and new_line or '',
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310 'action': action,
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311 'line': line
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312 })
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313 line = lineiter.next()
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314
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315 except StopIteration:
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316 pass
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317
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318 # highlight inline changes
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319 for file in files:
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320 for chunk in chunks:
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321 lineiter = iter(chunk)
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322 #first = True
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323 try:
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324 while 1:
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325 line = lineiter.next()
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326 if line['action'] != 'unmod':
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327 nextline = lineiter.next()
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328 if nextline['action'] == 'unmod' or \
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329 nextline['action'] == line['action']:
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330 continue
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331 self.differ(line, nextline)
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332 except StopIteration:
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333 pass
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334
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335 return files
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336
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337 def prepare(self):
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338 """
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339 Prepare the passed udiff for HTML rendering. It'l return a list
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340 of dicts
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341 """
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342 return self._parse_udiff()
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343
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344 def _safe_id(self, idstring):
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345 """Make a string safe for including in an id attribute.
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346
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347 The HTML spec says that id attributes 'must begin with
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348 a letter ([A-Za-z]) and may be followed by any number
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349 of letters, digits ([0-9]), hyphens ("-"), underscores
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350 ("_"), colons (":"), and periods (".")'. These regexps
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351 are slightly over-zealous, in that they remove colons
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352 and periods unnecessarily.
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353
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354 Whitespace is transformed into underscores, and then
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355 anything which is not a hyphen or a character that
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356 matches \w (alphanumerics and underscore) is removed.
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357
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358 """
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359 # Transform all whitespace to underscore
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360 idstring = re.sub(r'\s', "_", '%s' % idstring)
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361 # Remove everything that is not a hyphen or a member of \w
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362 idstring = re.sub(r'(?!-)\W', "", idstring).lower()
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363 return idstring
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364
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365 def raw_diff(self):
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366 """
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367 Returns raw string as udiff
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368 """
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369 udiff_copy = self.copy_iterator()
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370 if self.__format == 'gitdiff':
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371 udiff_copy = self._parse_gitdiff(udiff_copy)
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372 return u''.join(udiff_copy)
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373
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374 def as_html(self, table_class='code-difftable', line_class='line',
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375 new_lineno_class='lineno old', old_lineno_class='lineno new',
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376 code_class='code'):
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377 """
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378 Return udiff as html table with customized css classes
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379 """
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380 def _link_to_if(condition, label, url):
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381 """
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382 Generates a link if condition is meet or just the label if not.
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383 """
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384
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385 if condition:
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386 return '''<a href="%(url)s">%(label)s</a>''' % {'url': url,
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387 'label': label}
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388 else:
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389 return label
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390 diff_lines = self.prepare()
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391 _html_empty = True
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392 _html = []
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393 _html.append('''<table class="%(table_class)s">\n''' \
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394 % {'table_class': table_class})
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395 for diff in diff_lines:
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396 for line in diff['chunks']:
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397 _html_empty = False
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398 for change in line:
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399 _html.append('''<tr class="%(line_class)s %(action)s">\n''' \
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400 % {'line_class': line_class,
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401 'action': change['action']})
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402 anchor_old_id = ''
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403 anchor_new_id = ''
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404 anchor_old = "%(filename)s_o%(oldline_no)s" % \
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405 {'filename': self._safe_id(diff['filename']),
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406 'oldline_no': change['old_lineno']}
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407 anchor_new = "%(filename)s_n%(oldline_no)s" % \
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408 {'filename': self._safe_id(diff['filename']),
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409 'oldline_no': change['new_lineno']}
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410 cond_old = change['old_lineno'] != '...' and \
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411 change['old_lineno']
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412 cond_new = change['new_lineno'] != '...' and \
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413 change['new_lineno']
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414 if cond_old:
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415 anchor_old_id = 'id="%s"' % anchor_old
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416 if cond_new:
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417 anchor_new_id = 'id="%s"' % anchor_new
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418 ###########################################################
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419 # OLD LINE NUMBER
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420 ###########################################################
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421 _html.append('''\t<td %(a_id)s class="%(old_lineno_cls)s">''' \
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422 % {'a_id': anchor_old_id,
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423 'old_lineno_cls': old_lineno_class})
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424
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425 _html.append('''<pre>%(link)s</pre>''' \
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426 % {'link':
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427 _link_to_if(cond_old, change['old_lineno'], '#%s' \
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428 % anchor_old)})
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429 _html.append('''</td>\n''')
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430 ###########################################################
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431 # NEW LINE NUMBER
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432 ###########################################################
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433
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434 _html.append('''\t<td %(a_id)s class="%(new_lineno_cls)s">''' \
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435 % {'a_id': anchor_new_id,
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436 'new_lineno_cls': new_lineno_class})
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437
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438 _html.append('''<pre>%(link)s</pre>''' \
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439 % {'link':
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440 _link_to_if(cond_new, change['new_lineno'], '#%s' \
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441 % anchor_new)})
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442 _html.append('''</td>\n''')
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443 ###########################################################
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444 # CODE
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445 ###########################################################
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446 _html.append('''\t<td class="%(code_class)s">''' \
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447 % {'code_class': code_class})
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448 _html.append('''\n\t\t<pre>%(code)s</pre>\n''' \
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449 % {'code': change['line']})
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450 _html.append('''\t</td>''')
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451 _html.append('''\n</tr>\n''')
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452 _html.append('''</table>''')
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453 if _html_empty:
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454 return None
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455 return ''.join(_html)
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456
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457 def stat(self):
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458 """
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459 Returns tuple of adde,and removed lines for this instance
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460 """
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461 return self.adds, self.removes