asString method

@override String asString()

Implementation

@override
String asString() {
  var ret = '';
  var prefix = '';

  var radix = fmt_type == 'x' ? 16 : (fmt_type == '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'] = '';
  }

  var padding = '';
  var min_digits = options['precision'];
  var min_chars = options['width'];
  var num_length = ret.length;
  var sign_length = options['sign'].length;
  num str_len = 0;

  if (radix == 8 && min_chars <= min_digits) {
    num_length += prefix.length;
  }

  if (min_digits > num_length) {
    padding = Formatter.get_padding(min_digits - num_length, '0');
    ret = '${padding}${ret}';
    num_length = ret.length;
    padding = '';
  }

  str_len = num_length + sign_length + prefix.length;
  if (min_chars > str_len) {
    if (options['padding_char'] == '0' && !options['left_align']) {
      padding = Formatter.get_padding(min_chars - str_len, '0');
    } else {
      padding = Formatter.get_padding(min_chars - str_len, ' ');
    }
  }

  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;
}