public function mergePrefixCode($code)
    {
        $tmp = '';
        foreach ($this->compiler->prefix_code as $preCode) {
            $tmp .= $preCode;
        }
        $this->compiler->prefix_code = array();
        $tmp .= $code;
        return new Smarty_Internal_ParseTree_Tag($this, $this->compiler->processNocacheCode($tmp, true));
    }