<?php
/**
 *
 * @category        module
 * @package         droplets
 * @author          Ruud Eisinga (Ruud) John (PCWacht)
 * @author          WebsiteBaker Project
 * @copyright       2004-2009, Ryan Djurovich
 * @copyright       2009-2011, Website Baker Org. e.V.
 * @link            http://www.websitebaker2.org/
 * @license         http://www.gnu.org/licenses/gpl.html
 * @platform        WebsiteBaker 2.8.x
 * @requirements    PHP 5.2.2 and higher
 * @version         $Id: droplets.php 2 2017-07-02 15:14:29Z Manuela $
 * @filesource      $HeadURL: svn://isteam.dynxs.de/wb/2.10.x/trunk/modules/droplets/droplets.php $
 * @lastmodified    $Date: 2017-07-02 17:14:29 +0200 (Sun, 02 Jul 2017) $
 *
 *    droplets are small codeblocks that are called from anywhere in the template.
 *     To call a droplet just use [[dropletname]]. optional parameters for a droplet can be used like [[dropletname?parameter=value&parameter2=value]]\
 *
 *  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.
 *  1.0.3, optimize, reduce memory consumption, increase speed, remove CSS, enable nested droplets
 *
 */
/* -------------------------------------------------------- */
// Must include code to stop this file being accessed directly
if(!defined('WB_PATH')) {

    require_once(dirname(dirname(dirname(__FILE__))).'/framework/globalExceptionHandler.php');
    throw new IllegalFileException();
}
/* -------------------------------------------------------- */

    function do_eval($_x_codedata, $_x_varlist, &$wb_page_data)
    {
        extract($_x_varlist, EXTR_SKIP);
        return(eval($_x_codedata));
    }

    function processDroplets( &$wb_page_data ) {
// collect all droplets from document
        $droplet_tags = array();
        $droplet_replacements = array();
        $droplet_search = '\[\[(.*?)\]\]'; // \[\[(\S*?)\]\]
        if( preg_match_all( '/'.$droplet_search.'/', $wb_page_data, $found_droplets ) )
        {
            foreach( $found_droplets[1] as $droplet )
            {
                if(array_key_exists( '[['.$droplet.']]', $droplet_tags) == false)
                {
// go in if same droplet with same arguments is not processed already
                    $varlist = array();
// split each droplet command into droplet_name and request_string
                    $tmp = preg_split('/\?/', $droplet, 2);
                    $droplet_name = $tmp[0];
                    $request_string = (isset($tmp[1]) ? $tmp[1] : '');
                    if( $request_string != '' )
                    {
// make sure we can parse the arguments correctly
                        $request_string = html_entity_decode($request_string, ENT_COMPAT,DEFAULT_CHARSET);
// create array of arguments from query_string
                        $argv = preg_split( '/&(?!amp;)/', $request_string );
                        foreach ($argv as $argument)
                        {
// split argument in pair of varname, value
                            list( $variable, $value ) = explode('=', $argument,2);
                            if( !empty($value) )
                            {
// re-encode the value and push the var into varlist
                                $varlist[$variable] = htmlentities($value, ENT_COMPAT,DEFAULT_CHARSET);
                            }
                        }
                    }
                    else
                    {
// no arguments given, so
                        $droplet_name = $droplet;
                    }
// request the droplet code from database
                    $sql  = 'SELECT `code` FROM `'.TABLE_PREFIX.'mod_droplets` '
                          . 'WHERE `name` LIKE \''.$droplet_name.'\''
                          .   'AND `active` = 1';
                    $codedata = $GLOBALS['database']->get_one($sql);
                    if (!is_null($codedata))
                    {
                        $newvalue = do_eval($codedata, $varlist, $wb_page_data);
// check returnvalue (must be a string of 1 char at least or (bool)true
                        if ($newvalue == '' && $newvalue !== true)
                        {
                            if(DEBUG === true)
                            {
                                $newvalue = '<span class="mod_droplets_err">Error in: '.$droplet.', no valid returnvalue.</span>';
                            } else {
                                $newvalue = true;
                            }
                        }
                        if ($newvalue === true) { $newvalue = ""; }
// remove any defined CSS section from code. For valid XHTML a CSS-section is allowed inside <head>...</head> only!
                        $newvalue = preg_replace('/<style.*>.*<\/style>/siU', '', $newvalue);
// push droplet-tag and it's replacement into Search/Replace array after executing only
                        $droplet_tags[]         = '[['.$droplet.']]';
                        $droplet_replacements[] = $newvalue;
                    }
                }
            }    // End foreach( $found_droplets[1] as $droplet )
// replace each Droplet-Tag with coresponding $newvalue
            $wb_page_data = str_replace($droplet_tags, $droplet_replacements, $wb_page_data);
        }
// returns TRUE if droplets found in content, FALSE if not
        return( count($droplet_tags)!=0 );
    }

    function evalDroplets( &$wb_page_data, $max_loops = 3 ) {
        $max_loops = ((int)$max_loops = 0 ? 3 : (int)$max_loops);
        while( (processDroplets($wb_page_data) == true) && ($max_loops > 0))
        {
            $max_loops--;
        }
        return $wb_page_data;
    }