Latte\Runtime\Filters::escapeHtmlComment PHP Method

    public static function escapeHtmlComment($s)
    {
        $s = (string) $s;
        if ($s && ($s[0] === '-' || $s[0] === '>' || $s[0] === '!')) {
            $s = ' ' . $s;
        }
        $s = str_replace('--', '- - ', $s);
        if (substr($s, -1) === '-') {
            $s .= ' ';
        }
        return $s;
    }