C++ DigitList::set方法代码示例

VisibleDigits &
FixedPrecision::initVisibleDigits(
        int64_t value,
        VisibleDigits &digits,
        UErrorCode &status) const {
    if (U_FAILURE(status)) {
        return digits;
    }
    if (!fRoundingIncrement.isZero()) {
        // If we have round increment, use digit list.
        DigitList digitList;
        digitList.set(value);
        return initVisibleDigits(digitList, digits, status);
    }
    // Try fast path
    if (initVisibleDigits(value, 0, digits, status)) {
        digits.fAbsDoubleValue = fabs((double) value);
        digits.fAbsDoubleValueSet = U_SUCCESS(status) && !digits.isOverMaxDigits();
        return digits;
    }
    // Oops have to use digit list
    DigitList digitList;
    digitList.set(value);
    return initVisibleDigits(digitList, digits, status);
}

// ---------------------------------------
void
Formattable::setDecimalNumber(StringPiece numberString, UErrorCode &status) {
    if (U_FAILURE(status)) {
        return;
    }
    dispose();

    // Copy the input string and nul-terminate it.
    //    The decNumber library requires nul-terminated input.  StringPiece input
    //    is not guaranteed nul-terminated.  Too bad.
    //    CharString automatically adds the nul.
    DigitList *dnum = new DigitList(); // TODO: use getInternalDigitList
    if (dnum == NULL) {
        status = U_MEMORY_ALLOCATION_ERROR;
        return;
    }
    dnum->set(CharString(numberString, status).toStringPiece(), status);
    if (U_FAILURE(status)) {
        delete dnum;
        return;   // String didn't contain a decimal number.
    }
    adoptDigitList(dnum);

    // Note that we do not hang on to the caller's input string.
    // If we are asked for the string, we will regenerate one from fDecimalNum.
}

/**
 * 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());
    }
  }
}

VisibleDigitsWithExponent &
ScientificPrecision::initVisibleDigitsWithExponent(
        int64_t value,
        VisibleDigitsWithExponent &digits,
        UErrorCode &status) const {
    if (U_FAILURE(status)) {
        return digits;
    }
    DigitList digitList;
    digitList.set(value);
    return initVisibleDigitsWithExponent(digitList, digits, status);
}

void PluralRulesTest::checkSelect(const LocalPointer<PluralRules> &rules, UErrorCode &status, 
                                  int32_t line, const char *keyword, ...) {
    // The varargs parameters are a const char* strings, each being a decimal number.
    //   The formatting of the numbers as strings is significant, e.g.
    //     the difference between "2" and "2.0" can affect which rule matches (which keyword is selected).
    // Note: rules parameter is a LocalPointer reference rather than a PluralRules * to avoid having
    //       to write getAlias() at every (numerous) call site.

    if (U_FAILURE(status)) {
        errln("file %s, line %d, ICU error status: %s.", __FILE__, line, u_errorName(status));
        status = U_ZERO_ERROR;
        return;
    }

    if (rules == NULL) {
        errln("file %s, line %d: rules pointer is NULL", __FILE__, line);
        return;
    }
        
    va_list ap;
    va_start(ap, keyword);
    for (;;) {
        const char *num = va_arg(ap, const char *);
        if (strcmp(num, END_MARK) == 0) {
            break;
        }

        // DigitList is a convenient way to parse the decimal number string and get a double.
        DigitList  dl;
        dl.set(StringPiece(num), status);
        if (U_FAILURE(status)) {
            errln("file %s, line %d, ICU error status: %s.", __FILE__, line, u_errorName(status));
            status = U_ZERO_ERROR;
            continue;
        }
        double numDbl = dl.getDouble();
        const char *decimalPoint = strchr(num, '.');
        int fractionDigitCount = decimalPoint == NULL ? 0 : (num + strlen(num) - 1) - decimalPoint;
        int fractionDigits = fractionDigitCount == 0 ? 0 : atoi(decimalPoint + 1);
        FixedDecimal ni(numDbl, fractionDigitCount, fractionDigits);
        
        UnicodeString actualKeyword = rules->select(ni);
        if (actualKeyword != UnicodeString(keyword)) {
            errln("file %s, line %d, select(%s) returned incorrect keyword. Expected %s, got %s",
                   __FILE__, line, num, keyword, US(actualKeyword).cstr());
        }
    }
    va_end(ap);
}

/**
 * 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, 20, TRUE);
    
    UBool pad = FALSE;
    while (dl.fCount > (dl.fDecimalAt <= 0 ? 0 : dl.fDecimalAt)) {
      if (pad && useSpaces) {
        toInsertInto.insert(_pos + getPos(), gSpace);
      } else {
        pad = TRUE;
      }
      getRuleSet()->format((int64_t)(dl.fDigits[--dl.fCount] - '0'), toInsertInto, _pos + getPos());
    }
    while (dl.fDecimalAt < 0) {
      if (pad && useSpaces) {
        toInsertInto.insert(_pos + getPos(), gSpace);
      } else {
        pad = TRUE;
      }
      getRuleSet()->format((int64_t)0, toInsertInto, _pos + getPos());
      ++dl.fDecimalAt;
    }

    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());
    }
  }
}