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<?php
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/**
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 *
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 * @category        module
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 * @package         droplets
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 * @author          Ruud Eisinga (Ruud) John (PCWacht)
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 * @author          WebsiteBaker Project
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 * @copyright       2004-2009, Ryan Djurovich
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 * @copyright       2009-2011, Website Baker Org. e.V.
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 * @link			http://www.websitebaker2.org/
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 * @license         http://www.gnu.org/licenses/gpl.html
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 * @platform        WebsiteBaker 2.8.x
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 * @requirements    PHP 5.2.2 and higher
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 * @version         $Id$
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 * @filesource		$HeadURL$
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 * @lastmodified    $Date$
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 *
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 *	droplets are small codeblocks that are called from anywhere in the template.
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 * 	To call a droplet just use [[dropletname]]. optional parameters for a droplet can be used like [[dropletname?parameter=value&parameter2=value]]\
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 *
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 *  1.0.2, bugfix, Reused the evalDroplet function so the extracted parameters will be only available within the scope of the eval and cleared when ready.
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 *  1.0.3, optimize, reduce memory consumption, increase speed, remove CSS, enable nested droplets
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 *
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 */
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/* -------------------------------------------------------- */
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// Must include code to stop this file being accessed directly
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if(!defined('WB_PATH')) {
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	require_once(dirname(dirname(dirname(__FILE__))).'/framework/globalExceptionHandler.php');
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	throw new IllegalFileException();
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}
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/* -------------------------------------------------------- */
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	function do_eval($_x_codedata, $_x_varlist, &$wb_page_data)
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	{
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		extract($_x_varlist, EXTR_SKIP);
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		return(eval($_x_codedata));
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	}
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	function processDroplets( &$wb_page_data ) {
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// collect all droplets from document
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		$droplet_tags = array();
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		$droplet_replacements = array();
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		if( preg_match_all( '/\[\[(.*?)\]\]/', $wb_page_data, $found_droplets ) )
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		{
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			foreach( $found_droplets[1] as $droplet )
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			{
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				if(array_key_exists( '[['.$droplet.']]', $droplet_tags) == false)
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				{
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// go in if same droplet with same arguments is not processed already
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					$varlist = array();
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// split each droplet command into droplet_name and request_string
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					$tmp = preg_split('/\?/', $droplet, 2);
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					$droplet_name = $tmp[0];
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					$request_string = (isset($tmp[1]) ? $tmp[1] : '');
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					if( $request_string != '' )
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					{
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// make sure we can parse the arguments correctly
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						$request_string = html_entity_decode($request_string, ENT_COMPAT,DEFAULT_CHARSET);
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// create array of arguments from query_string
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						$argv = preg_split( '/&(?!amp;)/', $request_string );
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						foreach ($argv as $argument)
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						{
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// split argument in pair of varname, value
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							list( $variable, $value ) = explode('=', $argument,2);
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							if( !empty($value) )
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							{
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// re-encode the value and push the var into varlist
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								$varlist[$variable] = htmlentities($value, ENT_COMPAT,DEFAULT_CHARSET);
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							}
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						}
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					}
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					else
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					{
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// no arguments given, so
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						$droplet_name = $droplet;
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					}
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// request the droplet code from database
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					$sql = 'SELECT `code` FROM `'.TABLE_PREFIX.'mod_droplets` WHERE `name` LIKE "'.$droplet_name.'" AND `active` = 1';
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					$codedata = $GLOBALS['database']->get_one($sql);
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					if (!is_null($codedata))
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					{
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						$newvalue = do_eval($codedata, $varlist, $wb_page_data);
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// check returnvalue (must be a string of 1 char at least or (bool)true
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						if ($newvalue == '' && $newvalue !== true)
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						{
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							if(DEBUG === true)
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							{
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								$newvalue = '<span class="mod_droplets_err">Error in: '.$droplet.', no valid returnvalue.</span>';
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							}
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							else
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							{
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								$newvalue = true;
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							}
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						}
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						if ($newvalue === true) { $newvalue = ""; }
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// remove any defined CSS section from code. For valid XHTML a CSS-section is allowed inside <head>...</head> only!
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						$newvalue = preg_replace('/<style.*>.*<\/style>/siU', '', $newvalue);
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// push droplet-tag and it's replacement into Search/Replace array after executing only
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						$droplet_tags[]         = '[['.$droplet.']]';
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						$droplet_replacements[] = $newvalue;
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					}
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				}
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			}	// End foreach( $found_droplets[1] as $droplet )
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// replace each Droplet-Tag with coresponding $newvalue
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			$wb_page_data = str_replace($droplet_tags, $droplet_replacements, $wb_page_data);
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		}
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// returns TRUE if droplets found in content, FALSE if not
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		return( count($droplet_tags)!=0 );
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	}
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	function evalDroplets( &$wb_page_data, $max_loops = 3 ) {
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		$max_loops = ((int)$max_loops = 0 ? 3 : (int)$max_loops);
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		while( (processDroplets($wb_page_data) == true) && ($max_loops > 0))
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		{
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			$max_loops--;
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		}
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		return $wb_page_data;
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	}