Documentation TYPO3 par Ameos

class.t3lib_diff.php

00001 <?php
00002 /***************************************************************
00003 *  Copyright notice
00004 *
00005 *  (c) 1999-2005 Kasper Skaarhoj (kasperYYYY@typo3.com)
00006 *  All rights reserved
00007 *
00008 *  This script is part of the TYPO3 project. The TYPO3 project is
00009 *  free software; you can redistribute it and/or modify
00010 *  it under the terms of the GNU General Public License as published by
00011 *  the Free Software Foundation; either version 2 of the License, or
00012 *  (at your option) any later version.
00013 *
00014 *  The GNU General Public License can be found at
00015 *  http://www.gnu.org/copyleft/gpl.html.
00016 *  A copy is found in the textfile GPL.txt and important notices to the license
00017 *  from the author is found in LICENSE.txt distributed with these scripts.
00018 *
00019 *
00020 *  This script is distributed in the hope that it will be useful,
00021 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00022 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00023 *  GNU General Public License for more details.
00024 *
00025 *  This copyright notice MUST APPEAR in all copies of the script!
00026 ***************************************************************/
00066 class t3lib_diff {
00067 
00068                 // External, static:
00069         var $stripTags = 0;                     // If set, the HTML tags are stripped from the input strings first.
00070         var $diffOptions = '';          // Diff options. eg "--unified=3"
00071 
00072                 // Internal, dynamic:
00073         var $clearBufferIdx=0;          // This indicates the number of times the function addClearBuffer has been called - and used to detect the very first call...
00074 
00075 
00076 
00077 
00085         function makeDiffDisplay($str1,$str2)   {
00086                 if ($this->stripTags)   {
00087                         $str1 = strip_tags($str1);
00088                         $str2 = strip_tags($str2);
00089                 } else {
00090                         $str1 = $this->tagSpace($str1);
00091                         $str2 = $this->tagSpace($str2);
00092                 }
00093                 $str1Lines = $this->explodeStringIntoWords($str1);
00094                 $str2Lines = $this->explodeStringIntoWords($str2);
00095 
00096                 $diffRes = $this->getDiff(implode(chr(10),$str1Lines).chr(10),implode(chr(10),$str2Lines).chr(10));
00097 
00098                 if (is_array($diffRes)) {
00099                         reset($diffRes);
00100                         $c=0;
00101                         $diffResArray=array();
00102                         while(list(,$lValue)=each($diffRes))    {
00103                                 if (intval($lValue))    {
00104                                         $c=intval($lValue);
00105                                         $diffResArray[$c]['changeInfo']=$lValue;
00106                                 }
00107                                 if (substr($lValue,0,1)=='<')   {
00108                                         $diffResArray[$c]['old'][]=substr($lValue,2);
00109                                 }
00110                                 if (substr($lValue,0,1)=='>')   {
00111                                         $diffResArray[$c]['new'][]=substr($lValue,2);
00112                                 }
00113                         }
00114 
00115                         $outString='';
00116                         $clearBuffer='';
00117                         for ($a=-1;$a<count($str1Lines);$a++)   {
00118                                 if (is_array($diffResArray[$a+1]))      {
00119                                         if (strstr($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.
00120                                                 $clearBuffer.=htmlspecialchars($str1Lines[$a]).' ';
00121                                         }
00122 
00123                                         $outString.=$this->addClearBuffer($clearBuffer);
00124                                         $clearBuffer='';
00125                                         if (is_array($diffResArray[$a+1]['old']))       {
00126                                                 $outString.='<span class="diff-r">'.htmlspecialchars(implode(' ',$diffResArray[$a+1]['old'])).'</span> ';
00127                                         }
00128                                         if (is_array($diffResArray[$a+1]['new']))       {
00129                                                 $outString.='<span class="diff-g">'.htmlspecialchars(implode(' ',$diffResArray[$a+1]['new'])).'</span> ';
00130                                         }
00131                                         $chInfParts = explode(',',$diffResArray[$a+1]['changeInfo']);
00132                                         if (!strcmp($chInfParts[0],$a+1))       {
00133                                                 $newLine = intval($chInfParts[1])-1;
00134                                                 if ($newLine>$a)        $a=$newLine;    // Security that $a is not set lower than current for some reason...
00135                                         }
00136                                 } else {
00137                                         $clearBuffer.=htmlspecialchars($str1Lines[$a]).' ';
00138                                 }
00139                         }
00140                         $outString.=$this->addClearBuffer($clearBuffer,1);
00141 
00142                         $outString = str_replace('  ',chr(10),$outString);
00143                         if (!$this->stripTags)  {
00144                                 $outString = $this->tagSpace($outString,1);
00145                         }
00146                         return $outString;
00147                 }
00148         }
00149 
00159         function getDiff($str1,$str2)   {
00160                         // Create file 1 and write string
00161                 $file1 = t3lib_div::tempnam('diff1_');
00162                 t3lib_div::writeFile($file1,$str1);
00163                         // Create file 2 and write string
00164                 $file2 = t3lib_div::tempnam('diff2_');
00165                 t3lib_div::writeFile($file2,$str2);
00166                         // Perform diff.
00167                 $cmd = $GLOBALS['TYPO3_CONF_VARS']['BE']['diff_path'].' '.$this->diffOptions.' '.$file1.' '.$file2;
00168                 exec($cmd,$res);
00169 
00170                 unlink($file1);
00171                 unlink($file2);
00172 
00173                 return $res;
00174         }
00175 
00184         function addClearBuffer($clearBuffer,$last=0)   {
00185                 if (strlen($clearBuffer)>200)   {
00186                         $clearBuffer=($this->clearBufferIdx?t3lib_div::fixed_lgd_cs($clearBuffer,70):'').'['.strlen($clearBuffer).']'.(!$last?t3lib_div::fixed_lgd_cs($clearBuffer,-70):'');
00187                 }
00188                 $this->clearBufferIdx++;
00189                 return $clearBuffer;
00190         }
00191 
00200         function explodeStringIntoWords($str)   {
00201                 $strArr = t3lib_div::trimExplode(chr(10),$str);
00202                 $outArray=array();
00203                 reset($strArr);
00204                 while(list(,$lineOfWords)=each($strArr))        {
00205                         $allWords = t3lib_div::trimExplode(' ',$lineOfWords,1);
00206                         $outArray = array_merge($outArray,$allWords);
00207                         $outArray[]='';
00208                         $outArray[]='';
00209                 }
00210                 return $outArray;
00211         }
00212 
00221         function tagSpace($str,$rev=0)  {
00222                 if ($rev)       {
00223                         return str_replace(' &lt;','&lt;',str_replace('&gt; ','&gt;',$str));
00224                 } else {
00225                         return str_replace('<',' <',str_replace('>','> ',$str));
00226                 }
00227         }
00228 }
00229 
00230 if (defined('TYPO3_MODE') && $TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['t3lib/class.t3lib_diff.php'])      {
00231         include_once($TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['t3lib/class.t3lib_diff.php']);
00232 }
00233 ?>


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