Gregwar\RST\Span::reference PHP Method

    public function reference($reference, $value)
    {
        if ($reference) {
            $text = $value['text'] ?: (isset($reference['title']) ? $reference['title'] : '');
            $link = $this->link($url, trim($text));
        } else {
            $link = $this->link('#', '(unresolved reference)');
        }
        return $link;
    }