asString method

String asString()

Implementation

String asString() {
  String ret = '';
  String prefix = '';
  int radix = formatType == 'x' ? 16 : (formatType == 'o' ? 8 : 10);
  if (_arg < 0) {
    if (radix == 10) {
      _arg = _arg.abs();
      options['sign'] = '-';
    } else {
      // sort of reverse twos complement
      _arg = (MAX_INT - (~_arg) & MAX_INT);
    }
  }
  ret = _arg.toRadixString(radix);
  if (options['alternate_form']) {
    if (radix == 16 && _arg != 0) {
      prefix = "0x";
    } else if (radix == 8 && _arg != 0) {
      prefix = "0";
    }
    if (options['sign'] == '+' && radix != 10) {
      options['sign'] = '';
    }
  }
  // space "prefixes non-negative signed numbers with a space"
  if ((options['add_space'] && options['sign'] == '' && _arg > -1 && radix == 10)) {
    options['sign'] = ' ';
  }

  if (radix != 10) {
    options['sign'] = '';
  }
  String padding = '';
  var minDigits = options['precision'];
  var minChars = options['width'];
  int numLength = ret.length;
  var signLength = options['sign'].length;
  num strLen = 0;
  if (radix == 8 && minChars <= minDigits) {
    numLength += prefix.length;
  }
  if (minDigits > numLength) {
    padding = Formatter.getPadding(minDigits - numLength, '0');
    ret = "$padding$ret";
    numLength = ret.length;
    padding = '';
  }
  strLen = numLength + signLength + prefix.length;
  if (minChars > strLen) {
    if (options['padding_char'] == '0' && !options['left_align']) {
      padding = Formatter.getPadding(minChars - strLen, '0');
    } else {
      padding = Formatter.getPadding(minChars - strLen, ' ');
    }
  }
  if (options['left_align']) {
    ret = "${options['sign']}$prefix$ret$padding";
  } else if (options['padding_char'] == '0') {
    ret = "${options['sign']}$prefix$padding$ret";
  } else {
    ret = "$padding${options['sign']}$prefix$ret";
  }
  if (options['is_upper']) {
    ret = ret.toUpperCase();
  }
  return ret;
}