String _parseTrunk()

in lib/src/intl/number_format_parser.dart [228:288]
47 lines of code
21 McCabe index (conditional complexity)

  String _parseTrunk() {
    var loop = true;
    var trunk = StringBuffer();
    while (pattern.current != null && loop) {
      loop = parseTrunkCharacter(trunk);
    }

    if (zeroDigitCount == 0 && digitLeftCount > 0 && decimalPos >= 0) {
      // Handle '###.###' and '###.' and '.###'
      // Handle '.###'
      var n = decimalPos == 0 ? 1 : decimalPos;
      digitRightCount = digitLeftCount - n;
      digitLeftCount = n - 1;
      zeroDigitCount = 1;
    }

    // Do syntax checking on the digits.
    if (decimalPos < 0 && digitRightCount > 0 ||
        decimalPos >= 0 &&
            (decimalPos < digitLeftCount ||
                decimalPos > digitLeftCount + zeroDigitCount) ||
        groupingCount == 0) {
      throw FormatException('Malformed pattern "${pattern.input}"');
    }
    var totalDigits = digitLeftCount + zeroDigitCount + digitRightCount;

    result.maximumFractionDigits =
        decimalPos >= 0 ? totalDigits - decimalPos : 0;
    if (decimalPos >= 0) {
      result.minimumFractionDigits =
          digitLeftCount + zeroDigitCount - decimalPos;
      if (result.minimumFractionDigits < 0) {
        result.minimumFractionDigits = 0;
      }
    }

    // The effectiveDecimalPos is the position the decimal is at or would be at
    // if there is no decimal. Note that if decimalPos<0, then digitTotalCount
    // == digitLeftCount + zeroDigitCount.
    var effectiveDecimalPos = decimalPos >= 0 ? decimalPos : totalDigits;
    result.minimumIntegerDigits = effectiveDecimalPos - digitLeftCount;
    if (result.useExponentialNotation) {
      result.maximumIntegerDigits =
          digitLeftCount + result.minimumIntegerDigits;

      // In exponential display, we need to at least show something.
      if (result.maximumFractionDigits == 0 &&
          result.minimumIntegerDigits == 0) {
        result.minimumIntegerDigits = 1;
      }
    }

    result.finalGroupingSize = max(0, groupingCount);
    if (!groupingSizeSetExplicitly) {
      result.groupingSize = result.finalGroupingSize;
    }
    result.decimalSeparatorAlwaysShown =
        decimalPos == 0 || decimalPos == totalDigits;

    return trunk.toString();
  }