public function attributeScript(array $quill)
    {
        if ($quill['attributes'][OPTIONS::ATTRIBUTE_SCRIPT] === Options::ATTRIBUTE_SCRIPT_SUB) {
            $this->deltas[] = new SubScript($quill['insert'], $quill['attributes']);
        }
        if ($quill['attributes'][OPTIONS::ATTRIBUTE_SCRIPT] === Options::ATTRIBUTE_SCRIPT_SUPER) {
            $this->deltas[] = new SuperScript($quill['insert'], $quill['attributes']);
        }
    }