TryParse static method

ParseOutput TryParse(String value)

Returns a ParseOutput object by parsing a string value.

ParseOutput output = ByteSize.TryParse('1024MB');
output.ByteSizeObj == ByteSize.FromMegaBytes(1024);

Implementation

static ParseOutput TryParse(String value) {
  // Return a Boolean and a ByteSize object
  // Arg checking
  if (_IsNullOrWhiteSpace(value)) {
    throw ArgumentNullException('Input String is null or whitespace');
  }

  // Get the index of the first non-digit character
  String c, tempS = value.replaceAll(' ', ''); // Protect against whitespaces
  var found = false;

  // Pick first non-digit number
  var num = 1;
  for (var i = 0; i < tempS.length; i++) {
    c = tempS[i];
    if (!(_NumArray.contains(c) || c == '.')) {
      found = true;
      break;
    }

    num += 1;
  } // end for

  if (found == false) {
    return ParseOutput(true, ByteSize());
  }

  var lastNumber = num - 1;

  // Cut the input string in half
  var numberPart = tempS.substring(0, lastNumber).trim();
  var sizePart = tempS.substring(lastNumber).trim();

  // Get the numeric part
  double number;
  try {
    number = double.parse(numberPart);
  } on Exception {
    return ParseOutput(true, ByteSize());
  }

  // Get the magnitude part
  int tempInt;
  try {
    tempInt = _SymbolArray.indexOf(sizePart);
  } on Exception {
    return ParseOutput(true, ByteSize());
  }

  if (tempInt == 0) {
    var d1 = 1 * 1.0;
    if (_FloatingMod(number, d1) != 0) {
      // Can't have partial bits
      return ParseOutput(true, ByteSize());
    }

    return ParseOutput(false, ByteSize.FromBits(number.toInt()));
  }

  if (tempInt == 1) {
    return ParseOutput(false, ByteSize.FromBytes(number));
  }
  if ([2, 3, 4].contains(tempInt)) {
    return ParseOutput(false, ByteSize.FromKiloBytes(number));
  }
  if ([5, 6, 7].contains(tempInt)) {
    return ParseOutput(false, ByteSize.FromMegaBytes(number));
  }
  if ([8, 9, 10].contains(tempInt)) {
    return ParseOutput(false, ByteSize.FromGigaBytes(number));
  }
  if ([11, 12, 13].contains(tempInt)) {
    return ParseOutput(false, ByteSize.FromTeraBytes(number));
  }
  if ([14, 15, 16].contains(tempInt)) {
    return ParseOutput(false, ByteSize.FromPetaBytes(number));
  }
  return ParseOutput(true, ByteSize());
}