C++ DigitList::getCount方法代码示例

/**
 * If in "by digits" mode, fills in the substitution one decimal digit
 * at a time using the rule set containing this substitution.
 * Otherwise, uses the superclass function.
 * @param number The number being formatted
 * @param toInsertInto The string to insert the result of formatting
 * the substitution into
 * @param pos The position of the owning rule's rule text in
 * toInsertInto
 */
void
FractionalPartSubstitution::doSubstitution(double number, UnicodeString& toInsertInto, int32_t _pos) const
{
  // if we're not in "byDigits" mode, just use the inherited
  // doSubstitution() routine
  if (!byDigits) {
    NFSubstitution::doSubstitution(number, toInsertInto, _pos);

    // if we're in "byDigits" mode, transform the value into an integer
    // by moving the decimal point eight places to the right and
    // pulling digits off the right one at a time, formatting each digit
    // as an integer using this substitution's owning rule set
    // (this is slower, but more accurate, than doing it from the
    // other end)
  } else {
    //          int32_t numberToFormat = (int32_t)uprv_round(transformNumber(number) * uprv_pow(10, kMaxDecimalDigits));
    //          // this flag keeps us from formatting trailing zeros.  It starts
    //          // out false because we're pulling from the right, and switches
    //          // to true the first time we encounter a non-zero digit
    //          UBool doZeros = FALSE;
    //          for (int32_t i = 0; i < kMaxDecimalDigits; i++) {
    //              int64_t digit = numberToFormat % 10;
    //              if (digit != 0 || doZeros) {
    //                  if (doZeros && useSpaces) {
    //                      toInsertInto.insert(_pos + getPos(), gSpace);
    //                  }
    //                  doZeros = TRUE;
    //                  getRuleSet()->format(digit, toInsertInto, _pos + getPos());
    //              }
    //              numberToFormat /= 10;
    //          }

    DigitList dl;
    dl.set(number);
    dl.roundFixedPoint(20);     // round to 20 fraction digits.
    dl.reduce();                // Removes any trailing zeros.
    
    UBool pad = FALSE;
    for (int32_t didx = dl.getCount()-1; didx>=dl.getDecimalAt(); didx--) {
      // Loop iterates over fraction digits, starting with the LSD.
      //   include both real digits from the number, and zeros
      //   to the left of the MSD but to the right of the decimal point.
      if (pad && useSpaces) {
        toInsertInto.insert(_pos + getPos(), gSpace);
      } else {
        pad = TRUE;
      }
      int64_t digit = didx>=0 ? dl.getDigit(didx) - '0' : 0;
      getRuleSet()->format(digit, toInsertInto, _pos + getPos());
    }

    if (!pad) {
      // hack around lack of precision in digitlist. if we would end up with
      // "foo point" make sure we add a " zero" to the end.
      getRuleSet()->format((int64_t)0, toInsertInto, _pos + getPos());
    }
  }
}

UBool
FractionalPartSubstitution::doParse(const UnicodeString& text,
                ParsePosition& parsePosition,
                double baseValue,
                double /*upperBound*/,
                UBool lenientParse,
                Formattable& resVal) const
{
    // if we're not in byDigits mode, we can just use the inherited
    // doParse()
    if (!byDigits) {
        return NFSubstitution::doParse(text, parsePosition, baseValue, 0, lenientParse, resVal);

        // if we ARE in byDigits mode, parse the text one digit at a time
        // using this substitution's owning rule set (we do this by setting
        // upperBound to 10 when calling doParse() ) until we reach
        // nonmatching text
    } else {
        UnicodeString workText(text);
        ParsePosition workPos(1);
        double result = 0;
        int32_t digit;
//          double p10 = 0.1;

        DigitList dl;
        NumberFormat* fmt = NULL;
        while (workText.length() > 0 && workPos.getIndex() != 0) {
            workPos.setIndex(0);
            Formattable temp;
            getRuleSet()->parse(workText, workPos, 10, temp);
            UErrorCode status = U_ZERO_ERROR;
            digit = temp.getLong(status);
//            digit = temp.getType() == Formattable::kLong ?
//               temp.getLong() :
//            (int32_t)temp.getDouble();

            if (lenientParse && workPos.getIndex() == 0) {
                if (!fmt) {
                    status = U_ZERO_ERROR;
                    fmt = NumberFormat::createInstance(status);
                    if (U_FAILURE(status)) {
                        delete fmt;
                        fmt = NULL;
                    }
                }
                if (fmt) {
                    fmt->parse(workText, temp, workPos);
                    digit = temp.getLong(status);
                }
            }

            if (workPos.getIndex() != 0) {
                dl.append((char)('0' + digit));
//                  result += digit * p10;
//                  p10 /= 10;
                parsePosition.setIndex(parsePosition.getIndex() + workPos.getIndex());
                workText.removeBetween(0, workPos.getIndex());
                while (workText.length() > 0 && workText.charAt(0) == gSpace) {
                    workText.removeBetween(0, 1);
                    parsePosition.setIndex(parsePosition.getIndex() + 1);
                }
            }
        }
        delete fmt;

        result = dl.getCount() == 0 ? 0 : dl.getDouble();
        result = composeRuleValue(result, baseValue);
        resVal.setDouble(result);
        return TRUE;
    }
}