caxy /
php-htmldiff
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like HtmlDiff often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use HtmlDiff, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 7 | class HtmlDiff extends AbstractDiff |
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| 8 | { |
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| 9 | protected $wordIndices; |
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| 10 | protected $oldTables; |
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| 11 | protected $newTables; |
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| 12 | protected $insertSpaceInReplace = false; |
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| 13 | protected $newIsolatedDiffTags; |
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| 14 | protected $oldIsolatedDiffTags; |
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| 15 | protected $isolatedDiffTags = array ( |
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| 16 | 'ol' => '[[REPLACE_ORDERED_LIST]]', |
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| 17 | 'ul' => '[[REPLACE_UNORDERED_LIST]]', |
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| 18 | 'sub' => '[[REPLACE_SUB_SCRIPT]]', |
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| 19 | 'sup' => '[[REPLACE_SUPER_SCRIPT]]', |
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| 20 | 'dl' => '[[REPLACE_DEFINITION_LIST]]', |
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| 21 | 'table' => '[[REPLACE_TABLE]]', |
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| 22 | 'strong' => '[[REPLACE_STRONG]]', |
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| 23 | 'b' => '[[REPLACE_B]]', |
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| 24 | 'em' => '[[REPLACE_EM]]', |
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| 25 | 'i' => '[[REPLACE_I]]', |
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| 26 | 'a' => '[[REPLACE_A]]', |
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| 27 | ); |
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| 28 | protected $useTableDiffing = true; |
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| 29 | |||
| 30 | public function setUseTableDiffing($bool) |
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| 31 | { |
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| 32 | $this->useTableDiffing = $bool; |
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| 33 | |||
| 34 | return $this; |
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| 35 | } |
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| 36 | |||
| 37 | /** |
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| 38 | * @param boolean $boolean |
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| 39 | * @return HtmlDiff |
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| 40 | */ |
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| 41 | public function setInsertSpaceInReplace($boolean) |
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| 42 | { |
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| 43 | $this->insertSpaceInReplace = $boolean; |
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| 44 | |||
| 45 | return $this; |
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| 46 | } |
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| 47 | |||
| 48 | /** |
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| 49 | * @return boolean |
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| 50 | */ |
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| 51 | public function getInsertSpaceInReplace() |
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| 52 | { |
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| 53 | return $this->insertSpaceInReplace; |
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| 54 | } |
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| 55 | |||
| 56 | 11 | public function build() |
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| 57 | { |
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| 58 | 11 | $this->splitInputsToWords(); |
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| 59 | 11 | $this->replaceIsolatedDiffTags(); |
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| 60 | 11 | $this->indexNewWords(); |
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| 61 | |||
| 62 | 11 | $operations = $this->operations(); |
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| 63 | 11 | foreach ($operations as $item) { |
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| 64 | 11 | $this->performOperation( $item ); |
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| 65 | 11 | } |
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| 66 | |||
| 67 | 11 | return $this->content; |
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| 68 | } |
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| 69 | |||
| 70 | 11 | protected function indexNewWords() |
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| 71 | { |
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| 72 | 11 | $this->wordIndices = array(); |
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| 73 | 11 | foreach ($this->newWords as $i => $word) { |
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| 74 | 11 | if ( $this->isTag( $word ) ) { |
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| 75 | 8 | $word = $this->stripTagAttributes( $word ); |
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| 76 | 8 | } |
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| 77 | 11 | if ( isset( $this->wordIndices[ $word ] ) ) { |
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| 78 | 11 | $this->wordIndices[ $word ][] = $i; |
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| 79 | 11 | } else { |
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| 80 | 11 | $this->wordIndices[ $word ] = array( $i ); |
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| 81 | } |
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| 82 | 11 | } |
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| 83 | 11 | } |
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| 84 | |||
| 85 | 11 | protected function replaceIsolatedDiffTags() |
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| 86 | { |
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| 87 | 11 | $this->oldIsolatedDiffTags = $this->createIsolatedDiffTagPlaceholders($this->oldWords); |
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| 88 | 11 | $this->newIsolatedDiffTags = $this->createIsolatedDiffTagPlaceholders($this->newWords); |
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| 89 | 11 | } |
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| 90 | |||
| 91 | 11 | protected function createIsolatedDiffTagPlaceholders(&$words) |
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| 92 | { |
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| 93 | 11 | $openIsolatedDiffTags = 0; |
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| 94 | 11 | $isolatedDiffTagIndicies = array(); |
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| 95 | 11 | $isolatedDiffTagStart = 0; |
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| 96 | 11 | $currentIsolatedDiffTag = null; |
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| 97 | 11 | foreach ($words as $index => $word) { |
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| 98 | 11 | $openIsolatedDiffTag = $this->isOpeningIsolatedDiffTag($word, $currentIsolatedDiffTag); |
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| 99 | 11 | if ($openIsolatedDiffTag) { |
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| 100 | 11 | if ($openIsolatedDiffTags === 0) { |
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| 101 | 11 | $isolatedDiffTagStart = $index; |
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| 102 | 11 | } |
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| 103 | 11 | $openIsolatedDiffTags++; |
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| 104 | 11 | $currentIsolatedDiffTag = $openIsolatedDiffTag; |
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| 105 | 11 | } elseif ($openIsolatedDiffTags > 0 && $this->isClosingIsolatedDiffTag($word, $currentIsolatedDiffTag)) { |
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| 106 | 10 | $openIsolatedDiffTags--; |
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| 107 | 10 | if ($openIsolatedDiffTags == 0) { |
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| 108 | 10 | $isolatedDiffTagIndicies[] = array ('start' => $isolatedDiffTagStart, 'length' => $index - $isolatedDiffTagStart + 1, 'tagType' => $currentIsolatedDiffTag); |
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| 109 | 10 | $currentIsolatedDiffTag = null; |
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| 110 | 10 | } |
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| 111 | 10 | } |
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| 112 | 11 | } |
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| 113 | 11 | $isolatedDiffTagScript = array(); |
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| 114 | 11 | $offset = 0; |
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| 115 | 11 | foreach ($isolatedDiffTagIndicies as $isolatedDiffTagIndex) { |
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| 116 | 10 | $start = $isolatedDiffTagIndex['start'] - $offset; |
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| 117 | 10 | $placeholderString = $this->isolatedDiffTags[$isolatedDiffTagIndex['tagType']]; |
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| 118 | 10 | $isolatedDiffTagScript[$start] = array_splice($words, $start, $isolatedDiffTagIndex['length'], $placeholderString); |
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| 119 | 10 | $offset += $isolatedDiffTagIndex['length'] - 1; |
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| 120 | 11 | } |
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| 121 | |||
| 122 | 11 | return $isolatedDiffTagScript; |
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| 123 | |||
| 124 | } |
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| 125 | |||
| 126 | 11 | View Code Duplication | protected function isOpeningIsolatedDiffTag($item, $currentIsolatedDiffTag = null) |
| 127 | { |
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| 128 | 11 | $tagsToMatch = $currentIsolatedDiffTag !== null ? array($currentIsolatedDiffTag => $this->isolatedDiffTags[$currentIsolatedDiffTag]) : $this->isolatedDiffTags; |
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| 129 | 11 | foreach ($tagsToMatch as $key => $value) { |
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| 130 | 11 | if (preg_match("#<".$key."[^>]*>\\s*#iU", $item)) { |
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| 131 | 11 | return $key; |
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| 132 | } |
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| 133 | 11 | } |
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| 134 | |||
| 135 | 11 | return false; |
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| 136 | } |
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| 137 | |||
| 138 | 11 | View Code Duplication | protected function isClosingIsolatedDiffTag($item, $currentIsolatedDiffTag = null) |
| 139 | { |
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| 140 | 11 | $tagsToMatch = $currentIsolatedDiffTag !== null ? array($currentIsolatedDiffTag => $this->isolatedDiffTags[$currentIsolatedDiffTag]) : $this->isolatedDiffTags; |
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| 141 | 11 | foreach ($tagsToMatch as $key => $value) { |
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| 142 | 11 | if (preg_match("#</".$key."[^>]*>\\s*#iU", $item)) { |
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| 143 | 10 | return $key; |
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| 144 | } |
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| 145 | 11 | } |
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| 146 | |||
| 147 | 11 | return false; |
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| 148 | } |
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| 149 | |||
| 150 | 11 | protected function performOperation($operation) |
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| 151 | { |
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| 152 | 11 | switch ($operation->action) { |
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| 153 | 11 | case 'equal' : |
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| 154 | 11 | $this->processEqualOperation( $operation ); |
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| 155 | 11 | break; |
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| 156 | 9 | case 'delete' : |
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| 157 | 5 | $this->processDeleteOperation( $operation, "diffdel" ); |
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| 158 | 5 | break; |
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| 159 | 9 | case 'insert' : |
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| 160 | 8 | $this->processInsertOperation( $operation, "diffins"); |
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| 161 | 8 | break; |
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| 162 | 7 | case 'replace': |
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| 163 | 7 | $this->processReplaceOperation( $operation ); |
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| 164 | 7 | break; |
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| 165 | default: |
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| 166 | break; |
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| 167 | 11 | } |
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| 168 | 11 | } |
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| 169 | |||
| 170 | 7 | protected function processReplaceOperation($operation) |
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| 175 | |||
| 176 | 9 | View Code Duplication | protected function processInsertOperation($operation, $cssClass) |
| 177 | { |
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| 178 | 9 | $text = array(); |
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| 179 | 9 | foreach ($this->newWords as $pos => $s) { |
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| 180 | 9 | if ($pos >= $operation->startInNew && $pos < $operation->endInNew) { |
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| 181 | 9 | if (in_array($s, $this->isolatedDiffTags) && isset($this->newIsolatedDiffTags[$pos])) { |
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| 182 | 4 | foreach ($this->newIsolatedDiffTags[$pos] as $word) { |
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| 183 | 4 | $text[] = $word; |
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| 184 | 4 | } |
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| 185 | 4 | } else { |
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| 186 | 9 | $text[] = $s; |
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| 187 | } |
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| 188 | 9 | } |
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| 189 | 9 | } |
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| 190 | 9 | $this->insertTag( "ins", $cssClass, $text ); |
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| 191 | 9 | } |
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| 192 | |||
| 193 | 9 | View Code Duplication | protected function processDeleteOperation($operation, $cssClass) |
| 194 | { |
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| 195 | 9 | $text = array(); |
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| 196 | 9 | foreach ($this->oldWords as $pos => $s) { |
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| 197 | 9 | if ($pos >= $operation->startInOld && $pos < $operation->endInOld) { |
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| 198 | 9 | if (in_array($s, $this->isolatedDiffTags) && isset($this->oldIsolatedDiffTags[$pos])) { |
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| 199 | 6 | foreach ($this->oldIsolatedDiffTags[$pos] as $word) { |
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| 200 | 6 | $text[] = $word; |
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| 201 | 6 | } |
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| 202 | 6 | } else { |
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| 203 | 8 | $text[] = $s; |
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| 204 | } |
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| 205 | 9 | } |
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| 206 | 9 | } |
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| 207 | 9 | $this->insertTag( "del", $cssClass, $text ); |
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| 208 | 9 | } |
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| 209 | |||
| 210 | /** |
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| 211 | * @param Operation $operation |
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| 212 | * @param int $pos |
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| 213 | * @param string $placeholder |
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| 214 | * @param bool $stripWrappingTags |
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| 215 | * |
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| 216 | * @return string |
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| 217 | */ |
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| 218 | 7 | protected function diffIsolatedPlaceholder($operation, $pos, $placeholder, $stripWrappingTags = true) |
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| 219 | { |
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| 220 | 7 | $oldText = implode("", $this->findIsolatedDiffTagsInOld($operation, $pos)); |
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| 221 | 7 | $newText = implode("", $this->newIsolatedDiffTags[$pos]); |
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| 222 | |||
| 223 | 7 | if ($this->isListPlaceholder($placeholder)) { |
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| 224 | 4 | return $this->diffList($oldText, $newText); |
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| 225 | 5 | } elseif ($this->useTableDiffing && $this->isTablePlaceholder($placeholder)) { |
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| 226 | return $this->diffTables($oldText, $newText); |
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| 227 | 5 | } elseif ($this->isLinkPlaceholder($placeholder)) { |
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| 228 | 1 | return $this->diffLinks($oldText, $newText); |
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| 229 | } |
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| 230 | |||
| 231 | 4 | return $this->diffElements($oldText, $newText, $stripWrappingTags); |
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| 232 | } |
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| 233 | |||
| 234 | 5 | protected function diffElements($oldText, $newText, $stripWrappingTags = true) |
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| 235 | { |
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| 236 | 5 | $wrapStart = ''; |
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| 237 | 5 | $wrapEnd = ''; |
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| 238 | |||
| 239 | 5 | if ($stripWrappingTags) { |
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| 240 | 5 | $pattern = '/(^<[^>]+>)|(<\/[^>]+>$)/i'; |
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| 241 | 5 | $matches = array(); |
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| 242 | |||
| 243 | 5 | if (preg_match_all($pattern, $newText, $matches)) { |
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| 244 | 5 | $wrapStart = isset($matches[0][0]) ? $matches[0][0] : ''; |
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| 245 | 5 | $wrapEnd = isset($matches[0][1]) ? $matches[0][1] : ''; |
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| 246 | 5 | } |
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| 247 | 5 | $oldText = preg_replace($pattern, '', $oldText); |
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| 248 | 5 | $newText = preg_replace($pattern, '', $newText); |
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| 249 | 5 | } |
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| 250 | |||
| 251 | 5 | $diff = new HtmlDiff($oldText, $newText, $this->encoding, $this->specialCaseTags, $this->groupDiffs); |
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| 252 | |||
| 253 | 5 | return $wrapStart . $diff->build() . $wrapEnd; |
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| 254 | } |
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| 255 | |||
| 256 | 4 | protected function diffList($oldText, $newText) |
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| 257 | { |
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| 258 | 4 | $diff = new ListDiffNew($oldText, $newText, $this->encoding, $this->specialCaseTags, $this->groupDiffs); |
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| 259 | 4 | $diff->setMatchThreshold($this->matchThreshold); |
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| 260 | |||
| 261 | 4 | return $diff->build(); |
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| 262 | } |
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| 263 | |||
| 264 | protected function diffTables($oldText, $newText) |
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| 265 | { |
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| 266 | $diff = new TableDiff($oldText, $newText, $this->encoding, $this->specialCaseTags, $this->groupDiffs); |
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| 267 | $diff->setMatchThreshold($this->matchThreshold); |
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| 268 | $diff->setStrategy($this->strategy); |
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| 269 | |||
| 270 | return $diff->build(); |
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| 271 | } |
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| 272 | |||
| 273 | /** |
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| 274 | * @param string $oldText |
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| 275 | * @param string $newText |
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| 276 | * |
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| 277 | * @return string |
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| 278 | */ |
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| 279 | 1 | protected function diffLinks($oldText, $newText) |
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| 280 | { |
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| 281 | 1 | $oldHref = $this->getAttributeFromTag($oldText, 'href'); |
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| 282 | 1 | $newHref = $this->getAttributeFromTag($newText, 'href'); |
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| 283 | |||
| 284 | 1 | if ($oldHref != $newHref) { |
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| 285 | 1 | return sprintf( |
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| 286 | 1 | '%s%s', |
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| 287 | 1 | $this->wrapText($oldText, 'del', 'diffmod diff-href'), |
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| 288 | 1 | $this->wrapText($newText, 'ins', 'diffmod diff-href') |
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| 289 | 1 | ); |
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| 290 | } |
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| 291 | |||
| 292 | 1 | return $this->diffElements($oldText, $newText); |
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| 293 | } |
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| 294 | |||
| 295 | 11 | View Code Duplication | protected function processEqualOperation($operation) |
| 296 | { |
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| 297 | 11 | $result = array(); |
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| 298 | 11 | foreach ($this->newWords as $pos => $s) { |
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| 299 | |||
| 300 | 11 | if ($pos >= $operation->startInNew && $pos < $operation->endInNew) { |
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| 301 | 11 | if (in_array($s, $this->isolatedDiffTags) && isset($this->newIsolatedDiffTags[$pos])) { |
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| 302 | |||
| 303 | 7 | $result[] = $this->diffIsolatedPlaceholder($operation, $pos, $s); |
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| 304 | 7 | } else { |
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| 305 | 11 | $result[] = $s; |
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| 306 | } |
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| 307 | 11 | } |
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| 308 | 11 | } |
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| 309 | 11 | $this->content .= implode( "", $result ); |
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| 310 | 11 | } |
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| 311 | |||
| 312 | /** |
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| 313 | * @param string $text |
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| 314 | * @param string $attribute |
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| 315 | * |
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| 316 | * @return null|string |
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| 317 | */ |
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| 318 | 1 | protected function getAttributeFromTag($text, $attribute) |
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| 319 | { |
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| 320 | 1 | $matches = array(); |
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| 321 | 1 | if (preg_match(sprintf('/<a\s+[^>]*%s=([\'"])(.*)\1[^>]*>/i', $attribute), $text, $matches)) { |
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| 322 | 1 | return $matches[2]; |
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| 323 | } |
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| 324 | |||
| 325 | return null; |
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| 326 | } |
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| 327 | |||
| 328 | 7 | protected function isListPlaceholder($text) |
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| 332 | |||
| 333 | /** |
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| 334 | * @param string $text |
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| 335 | * |
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| 336 | * @return bool |
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| 337 | */ |
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| 338 | 5 | public function isLinkPlaceholder($text) |
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| 339 | { |
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| 340 | 5 | return $this->isPlaceholderType($text, 'a'); |
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| 341 | } |
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| 342 | |||
| 343 | /** |
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| 344 | * @param string $text |
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| 345 | * @param array|string $types |
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| 346 | * @param bool $strict |
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| 347 | * |
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| 348 | * @return bool |
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| 349 | */ |
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| 350 | 7 | protected function isPlaceholderType($text, $types, $strict = true) |
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| 351 | { |
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| 352 | 7 | if (!is_array($types)) { |
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| 353 | 5 | $types = array($types); |
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| 354 | 5 | } |
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| 355 | |||
| 356 | 7 | $criteria = array(); |
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| 357 | 7 | foreach ($types as $type) { |
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| 358 | 7 | if (isset($this->isolatedDiffTags[$type])) { |
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| 359 | 7 | $criteria[] = $this->isolatedDiffTags[$type]; |
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| 360 | 7 | } else { |
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| 361 | $criteria[] = $type; |
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| 362 | } |
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| 363 | 7 | } |
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| 364 | |||
| 365 | 7 | return in_array($text, $criteria, $strict); |
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| 366 | } |
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| 367 | |||
| 368 | 5 | protected function isTablePlaceholder($text) |
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| 369 | { |
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| 370 | 5 | return in_array($text, array( |
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| 371 | 5 | $this->isolatedDiffTags['table'], |
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| 372 | 5 | ), true); |
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| 373 | } |
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| 374 | |||
| 375 | 7 | protected function findIsolatedDiffTagsInOld($operation, $posInNew) |
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| 381 | |||
| 382 | 9 | protected function insertTag($tag, $cssClass, &$words) |
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| 383 | { |
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| 384 | 9 | while (true) { |
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| 385 | 9 | if ( count( $words ) == 0 ) { |
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| 386 | 9 | break; |
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| 387 | } |
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| 388 | |||
| 389 | 9 | $nonTags = $this->extractConsecutiveWords( $words, 'noTag' ); |
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| 390 | |||
| 391 | 9 | $specialCaseTagInjection = ''; |
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| 392 | 9 | $specialCaseTagInjectionIsBefore = false; |
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| 393 | |||
| 394 | 9 | if ( count( $nonTags ) != 0 ) { |
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| 395 | 9 | $text = $this->wrapText( implode( "", $nonTags ), $tag, $cssClass ); |
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| 396 | 9 | $this->content .= $text; |
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| 397 | 9 | } else { |
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| 398 | 6 | $firstOrDefault = false; |
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| 399 | 6 | foreach ($this->specialCaseOpeningTags as $x) { |
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| 400 | if ( preg_match( $x, $words[ 0 ] ) ) { |
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| 401 | $firstOrDefault = $x; |
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| 402 | break; |
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| 403 | } |
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| 404 | 6 | } |
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| 405 | 6 | if ($firstOrDefault) { |
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| 406 | $specialCaseTagInjection = '<ins class="mod">'; |
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| 407 | if ($tag == "del") { |
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| 408 | unset( $words[ 0 ] ); |
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| 409 | } |
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| 410 | 6 | } elseif ( array_search( $words[ 0 ], $this->specialCaseClosingTags ) !== false ) { |
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| 411 | $specialCaseTagInjection = "</ins>"; |
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| 412 | $specialCaseTagInjectionIsBefore = true; |
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| 413 | if ($tag == "del") { |
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| 414 | unset( $words[ 0 ] ); |
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| 415 | } |
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| 416 | } |
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| 417 | } |
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| 418 | 9 | if ( count( $words ) == 0 && count( $specialCaseTagInjection ) == 0 ) { |
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| 419 | break; |
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| 420 | } |
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| 421 | 9 | if ($specialCaseTagInjectionIsBefore) { |
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| 422 | $this->content .= $specialCaseTagInjection . implode( "", $this->extractConsecutiveWords( $words, 'tag' ) ); |
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| 423 | } else { |
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| 424 | 9 | $workTag = $this->extractConsecutiveWords( $words, 'tag' ); |
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| 425 | 9 | if ( isset( $workTag[ 0 ] ) && $this->isOpeningTag( $workTag[ 0 ] ) && !$this->isClosingTag( $workTag[ 0 ] ) ) { |
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| 426 | 8 | if ( strpos( $workTag[ 0 ], 'class=' ) ) { |
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| 427 | 4 | $workTag[ 0 ] = str_replace( 'class="', 'class="diffmod ', $workTag[ 0 ] ); |
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| 428 | 4 | $workTag[ 0 ] = str_replace( "class='", 'class="diffmod ', $workTag[ 0 ] ); |
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| 429 | 4 | } else { |
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| 430 | 8 | $workTag[ 0 ] = str_replace( ">", ' class="diffmod">', $workTag[ 0 ] ); |
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| 431 | } |
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| 432 | 8 | } |
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| 433 | 9 | $this->content .= implode( "", $workTag ) . $specialCaseTagInjection; |
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| 434 | } |
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| 435 | 9 | } |
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| 436 | 9 | } |
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| 437 | |||
| 438 | 9 | protected function checkCondition($word, $condition) |
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| 442 | |||
| 443 | 10 | protected function wrapText($text, $tagName, $cssClass) |
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| 447 | |||
| 448 | 9 | protected function extractConsecutiveWords(&$words, $condition) |
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| 449 | { |
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| 450 | 9 | $indexOfFirstTag = null; |
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| 451 | 9 | $words = array_values($words); |
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| 452 | 9 | foreach ($words as $i => $word) { |
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| 453 | 9 | if ( !$this->checkCondition( $word, $condition ) ) { |
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| 454 | 8 | $indexOfFirstTag = $i; |
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| 455 | 8 | break; |
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| 456 | } |
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| 457 | 9 | } |
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| 458 | 9 | if ($indexOfFirstTag !== null) { |
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| 459 | 8 | $items = array(); |
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| 460 | 8 | View Code Duplication | foreach ($words as $pos => $s) { |
| 461 | 8 | if ($pos >= 0 && $pos < $indexOfFirstTag) { |
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| 462 | 8 | $items[] = $s; |
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| 463 | 8 | } |
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| 464 | 8 | } |
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| 465 | 8 | if ($indexOfFirstTag > 0) { |
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| 466 | 8 | array_splice( $words, 0, $indexOfFirstTag ); |
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| 467 | 8 | } |
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| 468 | |||
| 469 | 8 | return $items; |
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| 470 | } else { |
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| 482 | |||
| 483 | 11 | protected function isTag($item) |
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| 487 | |||
| 488 | 11 | protected function isOpeningTag($item) |
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| 492 | |||
| 493 | 11 | protected function isClosingTag($item) |
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| 497 | |||
| 498 | 11 | protected function operations() |
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| 531 | |||
| 532 | 11 | protected function matchingBlocks() |
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| 539 | |||
| 540 | 11 | protected function findMatchingBlocks($startInOld, $endInOld, $startInNew, $endInNew, &$matchingBlocks) |
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| 553 | |||
| 554 | 8 | protected function stripTagAttributes($word) |
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| 560 | |||
| 561 | 11 | protected function findMatch($startInOld, $endInOld, $startInNew, $endInNew) |
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| 616 | } |
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| 617 |
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Overly long lines are hard to read on any screen. Most code styles therefor impose a maximum limit on the number of characters in a line.