protected function output()
    {
        $attrs   = '';
        $classes = 'fa-layers-text';
        $transforms = '';

        if (!empty($this->classes) && count($this->classes) > 0) {
            $classes .= ' ' . implode(' ', $this->classes);
        }

        if (!empty($this->attributes) && count($this->attributes) > 0) {
            foreach ($this->attributes as $attr => $val) {
                $attrs .= ' ' . $attr . '="' . $val . '"';
            }
        }

        if (!empty($this->transforms) && count($this->transforms) > 0) {
            $transformList = array();
            foreach ($this->transforms as $transform) {
                $transformList[] = implode('-', $transform);
            }
            $transforms = ' data-fa-transform="' . implode(' ', $transformList) . '"';
        }

        return sprintf(self::TEXT_HTML, $classes, $attrs, $transforms, $this->text);
    }