includes/diff/UnifiedDiffFormatter.php

   1 <?php
   2 /**
   3  * Portions taken from phpwiki-1.3.3.
   4  *
   5  * Copyright © 2000, 2001 Geoffrey T. Dairiki <dairiki@dairiki.org>
   6  * You may copy this code freely under the conditions of the GPL.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup DifferenceEngine
  25  */
  26
  27 /**
  28  * A formatter that outputs unified diffs
  29  * @ingroup DifferenceEngine
  30  */
  31 class UnifiedDiffFormatter extends DiffFormatter {
  32
  33         /** @var int */
  34         protected $leadingContextLines = 2;
  35
  36         /** @var int */
  37         protected $trailingContextLines = 2;
  38
  39         /**
  40          * @param string[] $lines
  41          * @param string $prefix
  42          */
  43         protected function lines( $lines, $prefix = ' ' ) {
  44                 foreach ( $lines as $line ) {
  45                         $this->writeOutput( "{$prefix}{$line}\n" );
  46                 }
  47         }
  48
  49         /**
  50          * @param string[] $lines
  51          */
  52         protected function added( $lines ) {
  53                 $this->lines( $lines, '+' );
  54         }
  55
  56         /**
  57          * @param string[] $lines
  58          */
  59         protected function deleted( $lines ) {
  60                 $this->lines( $lines, '-' );
  61         }
  62
  63         /**
  64          * @param string[] $orig
  65          * @param string[] $closing
  66          */
  67         protected function changed( $orig, $closing ) {
  68                 $this->deleted( $orig );
  69                 $this->added( $closing );
  70         }
  71
  72         /**
  73          * @param int $xbeg
  74          * @param int $xlen
  75          * @param int $ybeg
  76          * @param int $ylen
  77          *
  78          * @return string
  79          */
  80         protected function blockHeader( $xbeg, $xlen, $ybeg, $ylen ) {
  81                 return "@@ -$xbeg,$xlen +$ybeg,$ylen @@";
  82         }
  83
  84 }