class.t3lib_diff.php

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<?php
/***************************************************************
*  Copyright notice
*
*  (c) 1999-2004 Kasper Skaarhoj (kasperYYYY@typo3.com)
*  All rights reserved
*
*  This script is part of the TYPO3 project. The TYPO3 project 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.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*  A copy is found in the textfile GPL.txt and important notices to the license
*  from the author is found in LICENSE.txt distributed with these scripts.
*
*
*  This script 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.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/
class t3lib_diff {

      // External, static:
   var $stripTags = 0;        // If set, the HTML tags are stripped from the input strings first.
   var $diffOptions = '';     // Diff options. eg "--unified=3"

      // Internal, dynamic:
   var $clearBufferIdx=0;     // This indicates the number of times the function addClearBuffer has been called - and used to detect the very first call...




   function makeDiffDisplay($str1,$str2)  {
      if ($this->stripTags)   {
         $str1 = strip_tags($str1);
         $str2 = strip_tags($str2);
      } else {
         $str1 = $this->tagSpace($str1);
         $str2 = $this->tagSpace($str2);
      }
      $str1Lines = $this->explodeStringIntoWords($str1);
      $str2Lines = $this->explodeStringIntoWords($str2);

      $diffRes = $this->getDiff(implode(chr(10),$str1Lines).chr(10),implode(chr(10),$str2Lines).chr(10));

      if (is_array($diffRes)) {
         reset($diffRes);
         $c=0;
         $diffResArray=array();
         while(list(,$lValue)=each($diffRes))   {
            if (intval($lValue)) {
               $c=intval($lValue);
               $diffResArray[$c]['changeInfo']=$lValue;
            }
            if (substr($lValue,0,1)=='<') {
               $diffResArray[$c]['old'][]=substr($lValue,2);
            }
            if (substr($lValue,0,1)=='>') {
               $diffResArray[$c]['new'][]=substr($lValue,2);
            }
         }

         $outString='';
         $clearBuffer='';
         for ($a=-1;$a<count($str1Lines);$a++)  {
            if (is_array($diffResArray[$a+1]))  {
               if (strstr($diffResArray[$a+1]['changeInfo'],'a')) {  // a=Add, c=change, d=delete: If a, then the content is Added after the entry and we must insert the line content as well.
                  $clearBuffer.=htmlspecialchars($str1Lines[$a]).' ';
               }

               $outString.=$this->addClearBuffer($clearBuffer);
               $clearBuffer='';
               if (is_array($diffResArray[$a+1]['old'])) {
                  $outString.='<span class="diff-r">'.htmlspecialchars(implode(' ',$diffResArray[$a+1]['old'])).'</span> ';
               }
               if (is_array($diffResArray[$a+1]['new'])) {
                  $outString.='<span class="diff-g">'.htmlspecialchars(implode(' ',$diffResArray[$a+1]['new'])).'</span> ';
               }
               $chInfParts = explode(',',$diffResArray[$a+1]['changeInfo']);
               if (!strcmp($chInfParts[0],$a+1))   {
                  $newLine = intval($chInfParts[1])-1;
                  if ($newLine>$a)  $a=$newLine;   // Security that $a is not set lower than current for some reason...
               }
            } else {
               $clearBuffer.=htmlspecialchars($str1Lines[$a]).' ';
            }
         }
         $outString.=$this->addClearBuffer($clearBuffer,1);

         $outString = str_replace('  ',chr(10),$outString);
         if (!$this->stripTags)  {
            $outString = $this->tagSpace($outString,1);
         }
         return $outString;
      }
   }

   function getDiff($str1,$str2) {
      if (TYPO3_OS!='WIN') {
            // Create file 1 and write string
         $file1 = t3lib_div::tempnam('diff1_');
         t3lib_div::writeFile($file1,$str1);
            // Create file 2 and write string
         $file2 = t3lib_div::tempnam('diff2_');
         t3lib_div::writeFile($file2,$str2);
            // Perform diff.
         $cmd = $GLOBALS['TYPO3_CONF_VARS']['BE']['diff_path'].' '.$this->diffOptions.' '.$file1.' '.$file2;
         exec($cmd,$res);

         unlink($file1);
         unlink($file2);

         return $res;
      }
   }

   function addClearBuffer($clearBuffer,$last=0)   {
      if (strlen($clearBuffer)>200) {
         $clearBuffer=($this->clearBufferIdx?t3lib_div::fixed_lgd_cs($clearBuffer,70):'').'['.strlen($clearBuffer).']'.(!$last?t3lib_div::fixed_lgd_cs($clearBuffer,-70):'');
      }
      $this->clearBufferIdx++;
      return $clearBuffer;
   }

   function explodeStringIntoWords($str)  {
      $strArr = t3lib_div::trimExplode(chr(10),$str);
      $outArray=array();
      reset($strArr);
      while(list(,$lineOfWords)=each($strArr))  {
         $allWords = t3lib_div::trimExplode(' ',$lineOfWords,1);
         $outArray = array_merge($outArray,$allWords);
         $outArray[]='';
         $outArray[]='';
      }
      return $outArray;
   }

   function tagSpace($str,$rev=0)   {
      if ($rev)   {
         return str_replace(' &lt;','&lt;',str_replace('&gt; ','&gt;',$str));
      } else {
         return str_replace('<',' <',str_replace('>','> ',$str));
      }
   }
}

if (defined('TYPO3_MODE') && $TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['t3lib/class.t3lib_diff.php']) {
   include_once($TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['t3lib/class.t3lib_diff.php']);
}
?>

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