Mercurial > kallithea
annotate rhodecode/lib/vcs/utils/diffs.py @ 2278:24095abde696 beta
print statement cleanup
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Wed, 16 May 2012 01:24:23 +0200 |
parents | feb0fccdcf83 |
children | ab75def5c15d |
rev | line source |
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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 |
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17 |
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18 def get_udiff(filenode_old, filenode_new, show_whitespace=True): |
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19 """ |
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20 Returns unified diff between given ``filenode_old`` and ``filenode_new``. |
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21 """ |
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22 try: |
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23 filenode_old_date = filenode_old.changeset.date |
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24 except NodeError: |
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25 filenode_old_date = None |
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26 |
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27 try: |
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28 filenode_new_date = filenode_new.changeset.date |
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29 except NodeError: |
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30 filenode_new_date = None |
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31 |
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32 for filenode in (filenode_old, filenode_new): |
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33 if not isinstance(filenode, FileNode): |
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34 raise VCSError("Given object should be FileNode object, not %s" |
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35 % filenode.__class__) |
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36 |
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37 if filenode_old_date and filenode_new_date: |
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38 if not filenode_old_date < filenode_new_date: |
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39 logging.debug("Generating udiff for filenodes with not increasing " |
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40 "dates") |
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41 |
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42 vcs_udiff = unified_diff(filenode_old.content.splitlines(True), |
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43 filenode_new.content.splitlines(True), |
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44 filenode_old.name, |
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45 filenode_new.name, |
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46 filenode_old_date, |
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47 filenode_old_date) |
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48 return vcs_udiff |
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49 |
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50 |
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51 def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True): |
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52 """ |
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53 Returns git style diff between given ``filenode_old`` and ``filenode_new``. |
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54 |
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55 :param ignore_whitespace: ignore whitespaces in diff |
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56 """ |
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57 |
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58 for filenode in (filenode_old, filenode_new): |
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59 if not isinstance(filenode, FileNode): |
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60 raise VCSError("Given object should be FileNode object, not %s" |
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61 % filenode.__class__) |
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62 |
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63 old_raw_id = getattr(filenode_old.changeset, 'raw_id', '0' * 40) |
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64 new_raw_id = getattr(filenode_new.changeset, 'raw_id', '0' * 40) |
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65 |
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66 repo = filenode_new.changeset.repository |
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67 vcs_gitdiff = repo._get_diff(old_raw_id, new_raw_id, filenode_new.path, |
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68 ignore_whitespace) |
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69 |
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70 return vcs_gitdiff |
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71 |
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72 |
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73 class DiffProcessor(object): |
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74 """ |
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75 Give it a unified diff and it returns a list of the files that were |
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76 mentioned in the diff together with a dict of meta information that |
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77 can be used to render it in a HTML template. |
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78 """ |
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79 _chunk_re = re.compile(r'@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)') |
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80 |
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81 def __init__(self, diff, differ='diff', format='udiff'): |
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82 """ |
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83 :param diff: a text in diff format or generator |
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84 :param format: format of diff passed, `udiff` or `gitdiff` |
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85 """ |
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86 if isinstance(diff, basestring): |
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87 diff = [diff] |
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88 |
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89 self.__udiff = diff |
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90 self.__format = format |
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91 self.adds = 0 |
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92 self.removes = 0 |
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93 |
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94 if isinstance(self.__udiff, basestring): |
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95 self.lines = iter(self.__udiff.splitlines(1)) |
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96 |
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97 elif self.__format == 'gitdiff': |
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98 udiff_copy = self.copy_iterator() |
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99 self.lines = imap(self.escaper, self._parse_gitdiff(udiff_copy)) |
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100 else: |
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101 udiff_copy = self.copy_iterator() |
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102 self.lines = imap(self.escaper, udiff_copy) |
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103 |
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104 # Select a differ. |
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105 if differ == 'difflib': |
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106 self.differ = self._highlight_line_difflib |
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107 else: |
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108 self.differ = self._highlight_line_udiff |
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109 |
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110 def escaper(self, string): |
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111 return string.replace('<', '<').replace('>', '>') |
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112 |
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113 def copy_iterator(self): |
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114 """ |
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115 make a fresh copy of generator, we should not iterate thru |
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116 an original as it's needed for repeating operations on |
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117 this instance of DiffProcessor |
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118 """ |
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119 self.__udiff, iterator_copy = tee(self.__udiff) |
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120 return iterator_copy |
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121 |
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122 def _extract_rev(self, line1, line2): |
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123 """ |
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124 Extract the filename and revision hint from a line. |
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125 """ |
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126 |
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127 try: |
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128 if line1.startswith('--- ') and line2.startswith('+++ '): |
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129 l1 = line1[4:].split(None, 1) |
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130 old_filename = l1[0].lstrip('a/') if len(l1) >= 1 else None |
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131 old_rev = l1[1] if len(l1) == 2 else 'old' |
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132 |
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133 l2 = line2[4:].split(None, 1) |
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134 new_filename = l2[0].lstrip('b/') if len(l1) >= 1 else None |
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135 new_rev = l2[1] if len(l2) == 2 else 'new' |
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136 |
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137 filename = old_filename if (old_filename != |
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138 'dev/null') else new_filename |
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139 |
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140 return filename, new_rev, old_rev |
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141 except (ValueError, IndexError): |
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142 pass |
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143 |
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144 return None, None, None |
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145 |
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146 def _parse_gitdiff(self, diffiterator): |
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147 def line_decoder(l): |
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148 if l.startswith('+') and not l.startswith('+++'): |
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149 self.adds += 1 |
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150 elif l.startswith('-') and not l.startswith('---'): |
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151 self.removes += 1 |
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152 return l.decode('utf8', 'replace') |
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153 |
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154 output = list(diffiterator) |
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155 size = len(output) |
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156 |
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157 if size == 2: |
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158 l = [] |
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159 l.extend([output[0]]) |
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160 l.extend(output[1].splitlines(1)) |
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161 return map(line_decoder, l) |
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162 elif size == 1: |
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163 return map(line_decoder, output[0].splitlines(1)) |
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164 elif size == 0: |
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165 return [] |
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166 |
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167 raise Exception('wrong size of diff %s' % size) |
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168 |
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169 def _highlight_line_difflib(self, line, next): |
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170 """ |
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171 Highlight inline changes in both lines. |
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172 """ |
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173 |
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174 if line['action'] == 'del': |
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175 old, new = line, next |
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176 else: |
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177 old, new = next, line |
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178 |
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179 oldwords = re.split(r'(\W)', old['line']) |
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180 newwords = re.split(r'(\W)', new['line']) |
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181 |
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182 sequence = difflib.SequenceMatcher(None, oldwords, newwords) |
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183 |
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184 oldfragments, newfragments = [], [] |
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185 for tag, i1, i2, j1, j2 in sequence.get_opcodes(): |
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186 oldfrag = ''.join(oldwords[i1:i2]) |
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187 newfrag = ''.join(newwords[j1:j2]) |
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188 if tag != 'equal': |
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189 if oldfrag: |
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190 oldfrag = '<del>%s</del>' % oldfrag |
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191 if newfrag: |
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192 newfrag = '<ins>%s</ins>' % newfrag |
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193 oldfragments.append(oldfrag) |
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194 newfragments.append(newfrag) |
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195 |
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196 old['line'] = "".join(oldfragments) |
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197 new['line'] = "".join(newfragments) |
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198 |
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199 def _highlight_line_udiff(self, line, next): |
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200 """ |
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201 Highlight inline changes in both lines. |
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202 """ |
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203 start = 0 |
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204 limit = min(len(line['line']), len(next['line'])) |
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205 while start < limit and line['line'][start] == next['line'][start]: |
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206 start += 1 |
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207 end = -1 |
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208 limit -= start |
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209 while -end <= limit and line['line'][end] == next['line'][end]: |
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210 end -= 1 |
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211 end += 1 |
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212 if start or end: |
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213 def do(l): |
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214 last = end + len(l['line']) |
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215 if l['action'] == 'add': |
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216 tag = 'ins' |
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217 else: |
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218 tag = 'del' |
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219 l['line'] = '%s<%s>%s</%s>%s' % ( |
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220 l['line'][:start], |
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221 tag, |
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222 l['line'][start:last], |
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223 tag, |
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224 l['line'][last:] |
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225 ) |
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226 do(line) |
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227 do(next) |
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228 |
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229 def _parse_udiff(self): |
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230 """ |
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231 Parse the diff an return data for the template. |
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232 """ |
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233 lineiter = self.lines |
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234 files = [] |
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235 try: |
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236 line = lineiter.next() |
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237 # skip first context |
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238 skipfirst = True |
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239 while 1: |
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240 # continue until we found the old file |
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241 if not line.startswith('--- '): |
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242 line = lineiter.next() |
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243 continue |
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244 |
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245 chunks = [] |
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246 filename, old_rev, new_rev = \ |
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247 self._extract_rev(line, lineiter.next()) |
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248 files.append({ |
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249 'filename': filename, |
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250 'old_revision': old_rev, |
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251 'new_revision': new_rev, |
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252 'chunks': chunks |
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253 }) |
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254 |
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255 line = lineiter.next() |
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256 while line: |
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257 match = self._chunk_re.match(line) |
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258 if not match: |
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259 break |
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260 |
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261 lines = [] |
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262 chunks.append(lines) |
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263 |
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264 old_line, old_end, new_line, new_end = \ |
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265 [int(x or 1) for x in match.groups()[:-1]] |
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266 old_line -= 1 |
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267 new_line -= 1 |
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268 context = len(match.groups()) == 5 |
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269 old_end += old_line |
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270 new_end += new_line |
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271 |
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272 if context: |
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273 if not skipfirst: |
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274 lines.append({ |
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275 'old_lineno': '...', |
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276 'new_lineno': '...', |
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277 'action': 'context', |
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278 'line': line, |
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279 }) |
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280 else: |
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281 skipfirst = False |
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282 |
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283 line = lineiter.next() |
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284 while old_line < old_end or new_line < new_end: |
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285 if line: |
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286 command, line = line[0], line[1:] |
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287 else: |
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288 command = ' ' |
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289 affects_old = affects_new = False |
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290 |
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291 # ignore those if we don't expect them |
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292 if command in '#@': |
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293 continue |
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294 elif command == '+': |
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295 affects_new = True |
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296 action = 'add' |
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297 elif command == '-': |
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298 affects_old = True |
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299 action = 'del' |
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300 else: |
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301 affects_old = affects_new = True |
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302 action = 'unmod' |
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303 |
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304 old_line += affects_old |
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305 new_line += affects_new |
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306 lines.append({ |
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307 'old_lineno': affects_old and old_line or '', |
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308 'new_lineno': affects_new and new_line or '', |
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309 'action': action, |
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310 'line': line |
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311 }) |
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312 line = lineiter.next() |
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313 |
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314 except StopIteration: |
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315 pass |
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316 |
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317 # highlight inline changes |
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318 for file in files: |
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319 for chunk in chunks: |
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320 lineiter = iter(chunk) |
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321 #first = True |
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322 try: |
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323 while 1: |
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324 line = lineiter.next() |
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325 if line['action'] != 'unmod': |
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326 nextline = lineiter.next() |
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327 if nextline['action'] == 'unmod' or \ |
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328 nextline['action'] == line['action']: |
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329 continue |
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330 self.differ(line, nextline) |
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331 except StopIteration: |
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332 pass |
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333 |
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334 return files |
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335 |
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336 def prepare(self): |
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337 """ |
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338 Prepare the passed udiff for HTML rendering. It'l return a list |
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339 of dicts |
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340 """ |
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341 return self._parse_udiff() |
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342 |
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343 def _safe_id(self, idstring): |
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344 """Make a string safe for including in an id attribute. |
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345 |
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346 The HTML spec says that id attributes 'must begin with |
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347 a letter ([A-Za-z]) and may be followed by any number |
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348 of letters, digits ([0-9]), hyphens ("-"), underscores |
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349 ("_"), colons (":"), and periods (".")'. These regexps |
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350 are slightly over-zealous, in that they remove colons |
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351 and periods unnecessarily. |
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352 |
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353 Whitespace is transformed into underscores, and then |
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354 anything which is not a hyphen or a character that |
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355 matches \w (alphanumerics and underscore) is removed. |
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356 |
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357 """ |
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358 # Transform all whitespace to underscore |
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359 idstring = re.sub(r'\s', "_", '%s' % idstring) |
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360 # Remove everything that is not a hyphen or a member of \w |
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361 idstring = re.sub(r'(?!-)\W', "", idstring).lower() |
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362 return idstring |
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363 |
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364 def raw_diff(self): |
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365 """ |
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366 Returns raw string as udiff |
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367 """ |
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368 udiff_copy = self.copy_iterator() |
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369 if self.__format == 'gitdiff': |
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370 udiff_copy = self._parse_gitdiff(udiff_copy) |
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371 return u''.join(udiff_copy) |
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372 |
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373 def as_html(self, table_class='code-difftable', line_class='line', |
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374 new_lineno_class='lineno old', old_lineno_class='lineno new', |
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375 code_class='code'): |
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376 """ |
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377 Return udiff as html table with customized css classes |
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378 """ |
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379 def _link_to_if(condition, label, url): |
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380 """ |
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381 Generates a link if condition is meet or just the label if not. |
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382 """ |
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383 |
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384 if condition: |
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385 return '''<a href="%(url)s">%(label)s</a>''' % {'url': url, |
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386 'label': label} |
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387 else: |
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388 return label |
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389 diff_lines = self.prepare() |
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390 _html_empty = True |
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391 _html = [] |
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392 _html.append('''<table class="%(table_class)s">\n''' \ |
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393 % {'table_class': table_class}) |
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394 for diff in diff_lines: |
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395 for line in diff['chunks']: |
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396 _html_empty = False |
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397 for change in line: |
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398 _html.append('''<tr class="%(line_class)s %(action)s">\n''' \ |
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399 % {'line_class': line_class, |
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400 'action': change['action']}) |
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401 anchor_old_id = '' |
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402 anchor_new_id = '' |
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403 anchor_old = "%(filename)s_o%(oldline_no)s" % \ |
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404 {'filename': self._safe_id(diff['filename']), |
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405 'oldline_no': change['old_lineno']} |
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406 anchor_new = "%(filename)s_n%(oldline_no)s" % \ |
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407 {'filename': self._safe_id(diff['filename']), |
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408 'oldline_no': change['new_lineno']} |
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409 cond_old = change['old_lineno'] != '...' and \ |
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410 change['old_lineno'] |
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411 cond_new = change['new_lineno'] != '...' and \ |
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412 change['new_lineno'] |
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413 if cond_old: |
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414 anchor_old_id = 'id="%s"' % anchor_old |
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415 if cond_new: |
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416 anchor_new_id = 'id="%s"' % anchor_new |
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417 ########################################################### |
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418 # OLD LINE NUMBER |
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419 ########################################################### |
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420 _html.append('''\t<td %(a_id)s class="%(old_lineno_cls)s">''' \ |
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421 % {'a_id': anchor_old_id, |
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422 'old_lineno_cls': old_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_old, change['old_lineno'], '#%s' \ |
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427 % anchor_old)}) |
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428 _html.append('''</td>\n''') |
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429 ########################################################### |
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430 # NEW LINE NUMBER |
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431 ########################################################### |
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432 |
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433 _html.append('''\t<td %(a_id)s class="%(new_lineno_cls)s">''' \ |
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434 % {'a_id': anchor_new_id, |
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435 'new_lineno_cls': new_lineno_class}) |
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436 |
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437 _html.append('''<pre>%(link)s</pre>''' \ |
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438 % {'link': |
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439 _link_to_if(cond_new, change['new_lineno'], '#%s' \ |
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440 % anchor_new)}) |
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441 _html.append('''</td>\n''') |
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442 ########################################################### |
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443 # CODE |
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444 ########################################################### |
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445 _html.append('''\t<td class="%(code_class)s">''' \ |
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446 % {'code_class': code_class}) |
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447 _html.append('''\n\t\t<pre>%(code)s</pre>\n''' \ |
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448 % {'code': change['line']}) |
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449 _html.append('''\t</td>''') |
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450 _html.append('''\n</tr>\n''') |
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451 _html.append('''</table>''') |
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452 if _html_empty: |
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453 return None |
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454 return ''.join(_html) |
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455 |
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456 def stat(self): |
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457 """ |
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458 Returns tuple of adde,and removed lines for this instance |
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459 """ |
324ac367a4da
Added VCS into rhodecode core for faster and easier deployments of new versions
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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460 return self.adds, self.removes |