protected function compileJson($expression)
    {
        $parts = explode(',', $this->stripParentheses($expression));

        $options = isset($parts[1]) ? trim($parts[1]) : $this->encodingOptions;

        $depth = isset($parts[2]) ? trim($parts[2]) : 512;

        return "<?php echo json_encode($parts[0], $options, $depth) ?>";
    }