Info about the most recent changes of the plugin code can be found on the SourceForge SVN server:

Browse the history of NP_SearchHighlight at Sourceforge

<?php
 
 
/**
  * Plugin for Nucleus CMS (http://plugins.nucleuscms.org/)
  * Copyright (C) 2003 The Nucleus Plugins Project
  *
  * 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.
  *
  * see license.txt for the full license
  */
 
/*
    history:
		v0.3 (2003-08-01)
		     made it even easier to add more search engines (karma)
		v0.2 (2003-07-31)
			 added some engines and use a function to parse the querystring so 
			 it's more obvious how to add searchengines yourself (Xiffy)
		v0.1 (2003-07-30)
		     initial version: Google only 
*/
class NP_SearchHighlight extends NucleusPlugin {
 
    function getName() {	return 'Search Highlight';     }
    function getAuthor()  { return 'Wouter Demuynck';     }
    function getURL() {		return 'http://nucleuscms.org/'; }
    function getVersion() {	return '0.3'; }
    function getDescription() { 
        return 'When a visitor arrives at an item-page through a search engine, the terms from the search query are highlighted automatically';
    }
 
    function getMinNucleusVersion() {
        return 200;
    }
 
 
    function init() {
    	/*
    		extra engines can be added here.  
    		(make sure last line does not end with a comma)
 
    		engine => series of possible query elements (comma separated)
    	*/
    	$this->aEngines = array(
    		'google' 		=> 'q,as_q,as_oq,as_epq',
    		'altavista'		=> 'q',
    		'search.yahoo'	=> 'p',
    		'search.msn'	=> 'q',
    		'lycos'			=> 'query',    		
    		'hotbot'		=> 'query',
    		'ilse' 			=> 'search_for',
    		'vinden'		=> 'query',
    		'zoeken'		=> 'query',
    		'advalvas'		=> 'WORD'
    	);
    }
 
    function supportsFeature($what) {
        switch($what)
        {
            case 'SqlTablePrefix':
                return 1;
            default:
                return 0;
        }
    }
 
    function getEventList() {
        return array('PreSkinParse');
    }
 
    function event_PreSkinParse(&$data) {
        $referer = serverVar('HTTP_REFERER');
 
        // parse query-string
        $url = parse_url($referer);
        parse_str($url,$res);
 
        global $highlight;
        $highlight = $this->engineString($url[host],$url[query]);
 
    }
 
	/**
	 * Tries to parse a hostname and querystring into a search query
	 *
	 * @param $from
	 *		hostname (e.g. 'google.com')
	 * @param $query
	 *		query string (e.g. 'hl=nl&q=jeuj&ie=UTF-8)
	 * @return 
	 *		search query words (if any) or an empty string
	 */
    function engineString($from, $query)
    {
    	$from = strtolower($from);
    	$q = '';
 
    	foreach ($this->aEngines as $engine => $fieldnames) {
    		if (strstr($from, $engine)) {
	  			parse_str($query,$res);
    			$aFields = explode(',', $fieldnames);
    			foreach ($aFields as $field) {
    				if ($res[$field])
						$q .= ' ' . $res[$field];
				}
    			if ($q) break;
    		}
    	}
 
        return trim($q);
    }
} 
 
 
?>