"TYPO3 4.0.1: typo3_src-4.0.1/t3lib/class.t3lib_diff.php Source File", "datetime" => "Sat Dec 2 19:22:17 2006", "date" => "2 Dec 2006", "doxygenversion" => "1.4.6", "projectname" => "TYPO3 4.0.1", "projectnumber" => "4.0.1" ); get_header($doxygen_vars); ?>

class.t3lib_diff.php

<?php
/***************************************************************
*  Copyright notice
*
*  (c) 1999-2006 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...
        var $differenceLgd=0;



        function makeDiffDisplay($str1,$str2,$wrapTag='span')   {
                if ($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();
                        $differenceStr = '';
                        while(list(,$lValue)=each($diffRes))    {
                                if (intval($lValue))    {
                                        $c=intval($lValue);
                                        $diffResArray[$c]['changeInfo']=$lValue;
                                }
                                if (substr($lValue,0,1)=='<')   {
                                        $differenceStr.= $diffResArray[$c]['old'][] = substr($lValue,2);
                                }
                                if (substr($lValue,0,1)=='>')   {
                                        $differenceStr.= $diffResArray[$c]['new'][] = substr($lValue,2);
                                }
                        }

                        $this->differenceLgd = strlen($differenceStr);

                        $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']))       {
                                                $outString.='<'.$wrapTag.' class="diff-r">'.htmlspecialchars(implode(' ',$diffResArray[$a+1]['old'])).'</'.$wrapTag.'> ';
                                        }
                                        if (is_array($diffResArray[$a+1]['new']))       {
                                                $outString.='<'.$wrapTag.' class="diff-g">'.htmlspecialchars(implode(' ',$diffResArray[$a+1]['new'])).'</'.$wrapTag.'> ';
                                        }
                                        $chInfParts = explode(',',$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)   {
                        // 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;
                $res = array();
                exec($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']);
}
?>