<?php

/**
 * This variable parser uses PHP's internal code engine. Because it does
 * this, it can represent all inputs; however, it is dangerous and cannot
 * be used by users.
 */
class HTMLPurifier_VarParser_Native extends HTMLPurifier_VarParser {
	
	/**
	 *
	 * @param mixed $var        	
	 * @param int $type        	
	 * @param bool $allow_null        	
	 * @return null|string
	 */
	protected function parseImplementation($var, $type, $allow_null) {
		return $this->evalExpression ( $var );
	}
	
	/**
	 *
	 * @param string $expr        	
	 * @return mixed
	 * @throws HTMLPurifier_VarParserException
	 */
	protected function evalExpression($expr) {
		$var = null;
		$result = eval ( "\$var = $expr;" );
		if ($result === false) {
			throw new HTMLPurifier_VarParserException ( "Fatal error in evaluated code" );
		}
		return $var;
	}
}

// vim: et sw=4 sts=4