keys = append(keys, port)
		}
	}
	return keys
}

func parsePort(portStr string) (uint16, error) {
	port, err := strconv.ParseUint(strings.TrimSpace(portStr), 10, 16)
	if err != nil {
		return 0, fmt.Errorf("failed parsing port %q: %v", portStr, err)
	}
	return uint16(port), nil
}

func parsePorts(portsString string) ([]int, error) {
	portsString = strings.TrimSpace(portsString)

        this.ignoreCase = settings.getAsBoolean("ignore_case", false);
        this.removeTrailing = settings.getAsBoolean("remove_trailing", true);
        this.stopWords =
                Analysis.parseWords(env, settings, "stopwords", JapaneseAnalyzer.getDefaultStopSet(), NAMED_STOP_WORDS, ignoreCase);
    }

    @Override
    public TokenStream create(TokenStream tokenStream) {
        if (removeTrailing) {

              if (portColonOffset + 1 < componentDelimiterOffset) {
                host = input.percentDecode(pos = pos, limit = portColonOffset).toCanonicalHost()
                port = parsePort(input, portColonOffset + 1, componentDelimiterOffset)
                require(port != -1) {
                  "Invalid URL port: \"${input.substring(
                    portColonOffset + 1,