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<?php |
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/** |
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* Copyright © 2000, 2001 Geoffrey T. Dairiki <[email protected]> |
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* You may copy this code freely under the conditions of the GPL. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* http://www.gnu.org/copyleft/gpl.html |
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* |
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* @file |
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* @ingroup DifferenceEngine |
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* @defgroup DifferenceEngine DifferenceEngine |
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*/ |
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use MediaWiki\Diff\ComplexityException; |
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use MediaWiki\Diff\WordAccumulator; |
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/** |
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* Performs a word-level diff on several lines |
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* |
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* @ingroup DifferenceEngine |
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*/ |
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class WordLevelDiff extends \Diff { |
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/** |
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* @inheritdoc |
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*/ |
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protected $bailoutComplexity = 40000000; // Roughly 6K x 6K words changed |
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/** |
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* @param string[] $linesBefore |
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* @param string[] $linesAfter |
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*/ |
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public function __construct( $linesBefore, $linesAfter ) { |
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list( $wordsBefore, $wordsBeforeStripped ) = $this->split( $linesBefore ); |
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list( $wordsAfter, $wordsAfterStripped ) = $this->split( $linesAfter ); |
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try { |
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parent::__construct( $wordsBeforeStripped, $wordsAfterStripped ); |
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} catch ( ComplexityException $ex ) { |
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// Too hard to diff, just show whole paragraph(s) as changed |
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$this->edits = [ new DiffOpChange( $linesBefore, $linesAfter ) ]; |
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} |
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$xi = $yi = 0; |
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$editCount = count( $this->edits ); |
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for ( $i = 0; $i < $editCount; $i++ ) { |
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$orig = &$this->edits[$i]->orig; |
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if ( is_array( $orig ) ) { |
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$orig = array_slice( $wordsBefore, $xi, count( $orig ) ); |
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$xi += count( $orig ); |
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} |
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$closing = &$this->edits[$i]->closing; |
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if ( is_array( $closing ) ) { |
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$closing = array_slice( $wordsAfter, $yi, count( $closing ) ); |
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$yi += count( $closing ); |
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} |
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} |
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} |
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/** |
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* @param string[] $lines |
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* |
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* @return array[] |
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*/ |
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private function split( $lines ) { |
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$words = []; |
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$stripped = []; |
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$first = true; |
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foreach ( $lines as $line ) { |
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if ( $first ) { |
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$first = false; |
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} else { |
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$words[] = "\n"; |
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$stripped[] = "\n"; |
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} |
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$m = []; |
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if ( preg_match_all( '/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs', |
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$line, $m ) ) { |
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foreach ( $m[0] as $word ) { |
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$words[] = $word; |
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} |
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foreach ( $m[1] as $stripped_word ) { |
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$stripped[] = $stripped_word; |
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} |
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} |
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} |
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return [ $words, $stripped ]; |
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} |
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/** |
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* @return string[] |
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*/ |
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View Code Duplication |
public function orig() { |
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$orig = new WordAccumulator; |
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foreach ( $this->edits as $edit ) { |
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if ( $edit->type == 'copy' ) { |
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$orig->addWords( $edit->orig ); |
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} elseif ( $edit->orig ) { |
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$orig->addWords( $edit->orig, 'del' ); |
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} |
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} |
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$lines = $orig->getLines(); |
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return $lines; |
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} |
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/** |
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* @return string[] |
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*/ |
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View Code Duplication |
public function closing() { |
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$closing = new WordAccumulator; |
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foreach ( $this->edits as $edit ) { |
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if ( $edit->type == 'copy' ) { |
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$closing->addWords( $edit->closing ); |
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} elseif ( $edit->closing ) { |
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$closing->addWords( $edit->closing, 'ins' ); |
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} |
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} |
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$lines = $closing->getLines(); |
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return $lines; |
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} |
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} |
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wikimedia /
mediawiki
