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| 1 | <?php |
| 2 | /** |
| 3 | * Copyright © 2000, 2001 Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 4 | * You may copy this code freely under the conditions of the GPL. |
| 5 | * |
| 6 | * @license GPL-2.0-or-later |
| 7 | * @file |
| 8 | * @ingroup DifferenceEngine |
| 9 | * @defgroup DifferenceEngine DifferenceEngine |
| 10 | */ |
| 11 | |
| 12 | namespace Wikimedia\Diff; |
| 13 | |
| 14 | /** |
| 15 | * Performs a word-level diff on several lines |
| 16 | * |
| 17 | * @newable |
| 18 | * @ingroup DifferenceEngine |
| 19 | */ |
| 20 | class WordLevelDiff extends Diff { |
| 21 | /** |
| 22 | * @inheritDoc |
| 23 | */ |
| 24 | protected $bailoutComplexity = 40_000_000; // Roughly 6K x 6K words changed |
| 25 | |
| 26 | /** |
| 27 | * @stable to call |
| 28 | * @todo Don't do work in the constructor, use a service to create diffs instead (T257472). |
| 29 | * |
| 30 | * @param string[] $linesBefore |
| 31 | * @param string[] $linesAfter |
| 32 | */ |
| 33 | public function __construct( $linesBefore, $linesAfter ) { |
| 34 | [ $wordsBefore, $wordsBeforeStripped ] = $this->split( $linesBefore ); |
| 35 | [ $wordsAfter, $wordsAfterStripped ] = $this->split( $linesAfter ); |
| 36 | |
| 37 | try { |
| 38 | parent::__construct( $wordsBeforeStripped, $wordsAfterStripped ); |
| 39 | } catch ( ComplexityException ) { |
| 40 | // Too hard to diff, just show whole paragraph(s) as changed |
| 41 | $this->edits = [ new DiffOpChange( $linesBefore, $linesAfter ) ]; |
| 42 | } |
| 43 | |
| 44 | $xi = $yi = 0; |
| 45 | $editCount = count( $this->edits ); |
| 46 | for ( $i = 0; $i < $editCount; $i++ ) { |
| 47 | $orig = &$this->edits[$i]->orig; |
| 48 | if ( is_array( $orig ) ) { |
| 49 | $orig = array_slice( $wordsBefore, $xi, count( $orig ) ); |
| 50 | $xi += count( $orig ); |
| 51 | } |
| 52 | |
| 53 | $closing = &$this->edits[$i]->closing; |
| 54 | if ( is_array( $closing ) ) { |
| 55 | $closing = array_slice( $wordsAfter, $yi, count( $closing ) ); |
| 56 | $yi += count( $closing ); |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * @param string[] $lines |
| 63 | * |
| 64 | * @return array[] |
| 65 | */ |
| 66 | private function split( $lines ) { |
| 67 | $words = []; |
| 68 | $stripped = []; |
| 69 | $first = true; |
| 70 | foreach ( $lines as $line ) { |
| 71 | if ( $first ) { |
| 72 | $first = false; |
| 73 | } else { |
| 74 | $words[] = "\n"; |
| 75 | $stripped[] = "\n"; |
| 76 | } |
| 77 | $m = []; |
| 78 | if ( preg_match_all( '/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs', |
| 79 | $line, $m ) ) { |
| 80 | foreach ( $m[0] as $word ) { |
| 81 | $words[] = $word; |
| 82 | } |
| 83 | foreach ( $m[1] as $stripped_word ) { |
| 84 | $stripped[] = $stripped_word; |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | return [ $words, $stripped ]; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @return string[] |
| 94 | */ |
| 95 | public function orig() { |
| 96 | $orig = new WordAccumulator; |
| 97 | |
| 98 | foreach ( $this->edits as $edit ) { |
| 99 | if ( $edit->type == 'copy' ) { |
| 100 | $orig->addWords( $edit->orig ); |
| 101 | } elseif ( $edit->orig ) { |
| 102 | $orig->addWords( $edit->orig, 'del' ); |
| 103 | } |
| 104 | } |
| 105 | $lines = $orig->getLines(); |
| 106 | |
| 107 | return $lines; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * @return string[] |
| 112 | */ |
| 113 | public function closing() { |
| 114 | $closing = new WordAccumulator; |
| 115 | |
| 116 | foreach ( $this->edits as $edit ) { |
| 117 | if ( $edit->type == 'copy' ) { |
| 118 | $closing->addWords( $edit->closing ); |
| 119 | } elseif ( $edit->closing ) { |
| 120 | $closing->addWords( $edit->closing, 'ins' ); |
| 121 | } |
| 122 | } |
| 123 | $lines = $closing->getLines(); |
| 124 | |
| 125 | return $lines; |
| 126 | } |
| 127 | |
| 128 | } |
| 129 | |
| 130 | /** @deprecated class alias since 1.41 */ |
| 131 | class_alias( WordLevelDiff::class, 'WordLevelDiff' ); |