MediaWiki 1.30.2

[autoinstallsdev/mediawiki.git] / includes / diff / UnifiedDiffFormatter.php

<?php
/**
 * Portions taken from phpwiki-1.3.3.
 *
 * 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
 */

/**
 * A formatter that outputs unified diffs
 * @ingroup DifferenceEngine
 */
class UnifiedDiffFormatter extends DiffFormatter {

        /** @var int */
        protected $leadingContextLines = 2;

        /** @var int */
        protected $trailingContextLines = 2;

        /**
         * @param string[] $lines
         * @param string $prefix
         */
        protected function lines( $lines, $prefix = ' ' ) {
                foreach ( $lines as $line ) {
                        $this->writeOutput( "{$prefix}{$line}\n" );
                }
        }

        /**
         * @param string[] $lines
         */
        protected function added( $lines ) {
                $this->lines( $lines, '+' );
        }

        /**
         * @param string[] $lines
         */
        protected function deleted( $lines ) {
                $this->lines( $lines, '-' );
        }

        /**
         * @param string[] $orig
         * @param string[] $closing
         */
        protected function changed( $orig, $closing ) {
                $this->deleted( $orig );
                $this->added( $closing );
        }

        /**
         * @param int $xbeg
         * @param int $xlen
         * @param int $ybeg
         * @param int $ylen
         *
         * @return string
         */
        protected function blockHeader( $xbeg, $xlen, $ybeg, $ylen ) {
                return "@@ -$xbeg,$xlen +$ybeg,$ylen @@";
        }

}