getNextNumber method

double getNextNumber(WKTTokenizer tokenizer)

Parses the next number in the stream. Numbers with exponents are handled. NaN values are handled correctly, and the case of the "NaN" symbol is not significant.

@param tokenizer tokenizer over a stream of text in Well-known Text @return the next number in the stream @throws ParseException if the next token is not a valid number @throws IOException if an I/O error occurs

Implementation

double getNextNumber(WKTTokenizer tokenizer) {
  WKTToken token = tokenizer.next()!;
  switch (token.type) {
    case WKTTokenType.KEYWORD:
      {
        if (StringUtils.equalsIgnoreCase(token.value, NAN_SYMBOL)) {
          return double.nan;
        } else {
          try {
            return double.parse(token.value);
          } catch (ex) {
            throw ArgumentError("Invalid number: ${token.value}");
          }
        }
        break;
      }
    case WKTTokenType.NUMERIC_LITERAL:
      {
        try {
          return double.parse(token.value);
        } catch (ex) {
          throw ArgumentError("Invalid number: ${token.value}");
        }
      }
  }
  throw ArgumentError(
      "Expected number token but found ${token.type}: ${token.value}");
}