<?php
/**
 * @license    GPL 3 (http://www.gnu.org/licenses/gpl.html)
 * @author     Szymon Olewniczak <(my first name) [at] imz [dot] re>
 * @author     Cejka Rudolf <cejkar@fit.vutbr.cz>
 */

// must be run within DokuWiki
if(!defined('DOKU_INC')) die();

if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
require_once DOKU_PLUGIN.'syntax.php';

/**
 * All DokuWiki plugins to extend the parser/rendering mechanism
 * need to inherit from this class
 */
class action_plugin_filterrss extends DokuWiki_Action_Plugin {
    function register(Doku_Event_Handler $controller) {
	$controller->register_hook('PARSER_CACHE_USE', 'BEFORE', $this, '_preventCache', array ());
    }
    /**
     * Prevents page caching
     * @param mixed $param the parameters passed to register_hook when this handler was registered
     * @param object $event event object by reference
     */
    function _preventCache(&$event, $param) 
    {
	$cache = $event->data;
	if ($cache->mode != 'xhtml') return;
	if (!isset($cache->page)) return;
	$meta = p_get_metadata($cache->page, 'plugin_filterrss');
	if (is_array($meta) && $meta['purge']) {
	    $event->preventDefault();
	    $event->stopPropagation();
	    $event->result = false;
	}
    }
}