/exchange/code/trunk/administrator/components/com_exchange/models/transforms/expression.php

<?php
/**
 * @version		$Id: expression.php 280 2010-09-18 02:14:15Z eddieajau $
 * @package		NewLifeInIT
 * @subpackage	com_exchange
 * @copyright	Copyright 2005 - 2010 New Life in IT Pty Ltd. All rights reserved.
 * @license		GNU General Public License version 2 or later.
 * @link		http://www.theartofjoomla.com
 */

// no direct access
defined('_JEXEC') or die;

/**
 * @package		NewLifeInIT
 * @subpackage	com_exchange
 */
class XMLTransformExpression extends XMLIterator
{
	/**
	 * Evaluates an expression
	 * @param	object	The tag node
	 * @param	mixed	The value of the field
	 */
	function iterate(&$node, &$value)
	{
		$model	= &$this->getModel();
		$debug	= $model->getOption('debug_mode');
		$name	= (string) $node->parent['name'];

		if ($name) {
			$self	= $value[$name];
		}
		foreach ($value as $k => $v) {
			$$k = $v;
		}

		$code	= 'return (' . (string) $node . ');';
		$result	= eval($code);
		if ($debug) {
			ExchangeLog::add(200, '(' . (string) $node . ")\n= (".$result.')');
		}
		return $result;
	}
}