Sabberworm\CSS\Parser::parseURLValue PHP Method

    private function parseURLValue()
    {
        $bUseUrl = $this->comes('url', true);
        if ($bUseUrl) {
            $this->consume('url');
            $this->consumeWhiteSpace();
            $this->consume('(');
        }
        $this->consumeWhiteSpace();
        $oResult = new URL($this->parseStringValue());
        if ($bUseUrl) {
            $this->consumeWhiteSpace();
            $this->consume(')');
        }
        return $oResult;
    }