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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 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; if not, write to the Free Software Foundation, Inc., |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
19 | * http://www.gnu.org/copyleft/gpl.html |
20 | * |
21 | * @file |
22 | * @ingroup DifferenceEngine |
23 | * @defgroup DifferenceEngine DifferenceEngine |
24 | */ |
25 | |
26 | namespace Wikimedia\Diff; |
27 | |
28 | /** |
29 | * Performs a word-level diff on several lines |
30 | * |
31 | * @newable |
32 | * @ingroup DifferenceEngine |
33 | */ |
34 | class WordLevelDiff extends Diff { |
35 | /** |
36 | * @inheritDoc |
37 | */ |
38 | protected $bailoutComplexity = 40_000_000; // Roughly 6K x 6K words changed |
39 | |
40 | /** |
41 | * @stable to call |
42 | * @todo Don't do work in the constructor, use a service to create diffs instead (T257472). |
43 | * |
44 | * @param string[] $linesBefore |
45 | * @param string[] $linesAfter |
46 | */ |
47 | public function __construct( $linesBefore, $linesAfter ) { |
48 | [ $wordsBefore, $wordsBeforeStripped ] = $this->split( $linesBefore ); |
49 | [ $wordsAfter, $wordsAfterStripped ] = $this->split( $linesAfter ); |
50 | |
51 | try { |
52 | parent::__construct( $wordsBeforeStripped, $wordsAfterStripped ); |
53 | } catch ( ComplexityException $ex ) { |
54 | // Too hard to diff, just show whole paragraph(s) as changed |
55 | $this->edits = [ new DiffOpChange( $linesBefore, $linesAfter ) ]; |
56 | } |
57 | |
58 | $xi = $yi = 0; |
59 | $editCount = count( $this->edits ); |
60 | for ( $i = 0; $i < $editCount; $i++ ) { |
61 | $orig = &$this->edits[$i]->orig; |
62 | if ( is_array( $orig ) ) { |
63 | $orig = array_slice( $wordsBefore, $xi, count( $orig ) ); |
64 | $xi += count( $orig ); |
65 | } |
66 | |
67 | $closing = &$this->edits[$i]->closing; |
68 | if ( is_array( $closing ) ) { |
69 | $closing = array_slice( $wordsAfter, $yi, count( $closing ) ); |
70 | $yi += count( $closing ); |
71 | } |
72 | } |
73 | } |
74 | |
75 | /** |
76 | * @param string[] $lines |
77 | * |
78 | * @return array[] |
79 | */ |
80 | private function split( $lines ) { |
81 | $words = []; |
82 | $stripped = []; |
83 | $first = true; |
84 | foreach ( $lines as $line ) { |
85 | if ( $first ) { |
86 | $first = false; |
87 | } else { |
88 | $words[] = "\n"; |
89 | $stripped[] = "\n"; |
90 | } |
91 | $m = []; |
92 | if ( preg_match_all( '/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs', |
93 | $line, $m ) ) { |
94 | foreach ( $m[0] as $word ) { |
95 | $words[] = $word; |
96 | } |
97 | foreach ( $m[1] as $stripped_word ) { |
98 | $stripped[] = $stripped_word; |
99 | } |
100 | } |
101 | } |
102 | |
103 | return [ $words, $stripped ]; |
104 | } |
105 | |
106 | /** |
107 | * @return string[] |
108 | */ |
109 | public function orig() { |
110 | $orig = new WordAccumulator; |
111 | |
112 | foreach ( $this->edits as $edit ) { |
113 | if ( $edit->type == 'copy' ) { |
114 | $orig->addWords( $edit->orig ); |
115 | } elseif ( $edit->orig ) { |
116 | $orig->addWords( $edit->orig, 'del' ); |
117 | } |
118 | } |
119 | $lines = $orig->getLines(); |
120 | |
121 | return $lines; |
122 | } |
123 | |
124 | /** |
125 | * @return string[] |
126 | */ |
127 | public function closing() { |
128 | $closing = new WordAccumulator; |
129 | |
130 | foreach ( $this->edits as $edit ) { |
131 | if ( $edit->type == 'copy' ) { |
132 | $closing->addWords( $edit->closing ); |
133 | } elseif ( $edit->closing ) { |
134 | $closing->addWords( $edit->closing, 'ins' ); |
135 | } |
136 | } |
137 | $lines = $closing->getLines(); |
138 | |
139 | return $lines; |
140 | } |
141 | |
142 | } |
143 | |
144 | /** @deprecated class alias since 1.41 */ |
145 | class_alias( WordLevelDiff::class, 'WordLevelDiff' ); |