private function formatDataPath(string $path): string
    {
        if ('data' !== $this->scheme) {
            return $path;
        }

        if ('' == $path) {
            return 'text/plain;charset=us-ascii,';
        }

        if (false === mb_detect_encoding($path, 'US-ASCII', true) || false === strpos($path, ',')) {
            throw new SyntaxError(sprintf('The path `%s` is invalid according to RFC2937', $path));
        }

        $parts = explode(',', $path, 2) + [1 => null];
        $mediatype = explode(';', (string) $parts[0], 2) + [1 => null];
        $data = (string) $parts[1];
        $mimetype = $mediatype[0];
        if (null === $mimetype || '' === $mimetype) {
            $mimetype = 'text/plain';
        }

        $parameters = $mediatype[1];
        if (null === $parameters || '' === $parameters) {
            $parameters = 'charset=us-ascii';
        }

        $this->assertValidPath($mimetype, $parameters, $data);

        return $mimetype.';'.$parameters.','.$data;
    }