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