C++ NFRule类代码示例

void
NFRuleSet::format(double number, UnicodeString& toAppendTo, int32_t pos, UErrorCode& status) const
{
    NFRule *rule = findDoubleRule(number);
    if (rule) { // else error, but can't report it
        NFRuleSet* ncThis = (NFRuleSet*)this;
        if (ncThis->fRecursionCount++ >= RECURSION_LIMIT) {
            // stop recursion
            ncThis->fRecursionCount = 0;
        } else {
            rule->doFormat(number, toAppendTo, pos, status);
            ncThis->fRecursionCount--;
        }
    }
}

/**
 * If this is a >>> substitution, match only against ruleToUse.
 * Otherwise, use the superclass function.
 * @param text The string to parse
 * @param parsePosition Ignored on entry, updated on exit to point to
 * the first unmatched character.
 * @param baseValue The partial parse result prior to calling this
 * routine.
 */
UBool
ModulusSubstitution::doParse(const UnicodeString& text,
                             ParsePosition& parsePosition,
                             double baseValue,
                             double upperBound,
                             UBool lenientParse,
                             Formattable& result) const
{
    // if this isn't a >>> substitution, we can just use the
    // inherited parse() routine to do the parsing
    if (ruleToUse == NULL) {
        return NFSubstitution::doParse(text, parsePosition, baseValue, upperBound, lenientParse, result);

        // but if it IS a >>> substitution, we have to do it here: we
        // use the specific rule's doParse() method, and then we have to
        // do some of the other work of NFRuleSet.parse()
    } else {
        ruleToUse->doParse(text, parsePosition, FALSE, upperBound, result);

        if (parsePosition.getIndex() != 0) {
            UErrorCode status = U_ZERO_ERROR;
            double tempResult = result.getDouble(status);
            tempResult = composeRuleValue(tempResult, baseValue);
            result.setDouble(tempResult);
        }

        return TRUE;
    }
}

void
NFRuleSet::setDecimalFormatSymbols(const DecimalFormatSymbols &newSymbols, UErrorCode& status) {
    for (uint32_t i = 0; i < rules.size(); ++i) {
        rules[i]->setDecimalFormatSymbols(newSymbols, status);
    }
    // Switch the fraction rules to mirror the DecimalFormatSymbols.
    for (int32_t nonNumericalIdx = IMPROPER_FRACTION_RULE_INDEX; nonNumericalIdx <= MASTER_RULE_INDEX; nonNumericalIdx++) {
        if (nonNumericalRules[nonNumericalIdx]) {
            for (uint32_t fIdx = 0; fIdx < fractionRules.size(); fIdx++) {
                NFRule *fractionRule = fractionRules[fIdx];
                if (nonNumericalRules[nonNumericalIdx]->getBaseValue() == fractionRule->getBaseValue()) {
                    setBestFractionRule(nonNumericalIdx, fractionRule, FALSE);
                }
            }
        }
    }

    for (uint32_t nnrIdx = 0; nnrIdx < NON_NUMERICAL_RULE_LENGTH; nnrIdx++) {
        NFRule *rule = nonNumericalRules[nnrIdx];
        if (rule) {
            rule->setDecimalFormatSymbols(newSymbols, status);
        }
    }
}

void
NFRuleSet::appendRules(UnicodeString& result) const
{
    uint32_t i;

    // the rule set name goes first...
    result.append(name);
    result.append(gColon);
    result.append(gLineFeed);

    // followed by the regular rules...
    for (i = 0; i < rules.size(); i++) {
        rules[i]->_appendRuleText(result);
        result.append(gLineFeed);
    }

    // followed by the special rules (if they exist)
    for (i = 0; i < NON_NUMERICAL_RULE_LENGTH; ++i) {
        NFRule *rule = nonNumericalRules[i];
        if (nonNumericalRules[i]) {
            if (rule->getBaseValue() == NFRule::kImproperFractionRule
                || rule->getBaseValue() == NFRule::kProperFractionRule
                || rule->getBaseValue() == NFRule::kMasterRule)
            {
                for (uint32_t fIdx = 0; fIdx < fractionRules.size(); fIdx++) {
                    NFRule *fractionRule = fractionRules[fIdx];
                    if (fractionRule->getBaseValue() == rule->getBaseValue()) {
                        fractionRule->_appendRuleText(result);
                        result.append(gLineFeed);
                    }
                }
            }
            else {
                rule->_appendRuleText(result);
                result.append(gLineFeed);
            }
        }
    }
}

NFRule *
NFRuleSet::findNormalRule(int64_t number) const
{
    // if this is a fraction rule set, use findFractionRuleSetRule()
    // to find the rule (we should only go into this clause if the
    // value is 0)
    if (fIsFractionRuleSet) {
        return findFractionRuleSetRule((double)number);
    }

    // if the number is negative, return the negative-number rule
    // (if there isn't one, pretend the number is positive)
    if (number < 0) {
        if (negativeNumberRule) {
            return negativeNumberRule;
        } else {
            number = -number;
        }
    }

    // we have to repeat the preceding two checks, even though we
    // do them in findRule(), because the version of format() that
    // takes a long bypasses findRule() and goes straight to this
    // function.  This function does skip the fraction rules since
    // we know the value is an integer (it also skips the master
    // rule, since it's considered a fraction rule.  Skipping the
    // master rule in this function is also how we avoid infinite
    // recursion)

    // {dlf} unfortunately this fails if there are no rules except
    // special rules.  If there are no rules, use the master rule.

    // binary-search the rule list for the applicable rule
    // (a rule is used for all values from its base value to
    // the next rule's base value)
    int32_t hi = rules.size();
    if (hi > 0) {
        int32_t lo = 0;

        while (lo < hi) {
            int32_t mid = (lo + hi) / 2;
            if (rules[mid]->getBaseValue() == number) {
                return rules[mid];
            }
            else if (rules[mid]->getBaseValue() > number) {
                hi = mid;
            }
            else {
                lo = mid + 1;
            }
        }
        if (hi == 0) { // bad rule set, minimum base > 0
            return NULL; // want to throw exception here
        }

        NFRule *result = rules[hi - 1];

        // use shouldRollBack() to see whether we need to invoke the
        // rollback rule (see shouldRollBack()'s documentation for
        // an explanation of the rollback rule).  If we do, roll back
        // one rule and return that one instead of the one we'd normally
        // return
        if (result->shouldRollBack((double)number)) {
            if (hi == 1) { // bad rule set, no prior rule to rollback to from this base
                return NULL;
            }
            result = rules[hi - 2];
        }
        return result;
    }
    // else use the master rule
    return fractionRules[2];
}

void
NFRuleSet::parseRules(UnicodeString& description, const RuleBasedNumberFormat* owner, UErrorCode& status)
{
    // start by creating a Vector whose elements are Strings containing
    // the descriptions of the rules (one rule per element).  The rules
    // are separated by semicolons (there's no escape facility: ALL
    // semicolons are rule delimiters)

    if (U_FAILURE(status)) {
        return;
    }

    // ensure we are starting with an empty rule list
    rules.deleteAll();

    // dlf - the original code kept a separate description array for no reason,
    // so I got rid of it.  The loop was too complex so I simplified it.

    UnicodeString currentDescription;
    int32_t oldP = 0;
    while (oldP < description.length()) {
        int32_t p = description.indexOf(gSemicolon, oldP);
        if (p == -1) {
            p = description.length();
        }
        currentDescription.setTo(description, oldP, p - oldP);
        NFRule::makeRules(currentDescription, this, rules.last(), owner, rules, status);
        oldP = p + 1;
    }

    // for rules that didn't specify a base value, their base values
    // were initialized to 0.  Make another pass through the list and
    // set all those rules' base values.  We also remove any special
    // rules from the list and put them into their own member variables
    int64_t defaultBaseValue = 0;

    // (this isn't a for loop because we might be deleting items from
    // the vector-- we want to make sure we only increment i when
    // we _didn't_ delete aything from the vector)
    uint32_t i = 0;
    while (i < rules.size()) {
        NFRule* rule = rules[i];

        switch (rule->getType()) {
            // if the rule's base value is 0, fill in a default
            // base value (this will be 1 plus the preceding
            // rule's base value for regular rule sets, and the
            // same as the preceding rule's base value in fraction
            // rule sets)
        case NFRule::kNoBase:
            rule->setBaseValue(defaultBaseValue, status);
            if (!isFractionRuleSet()) {
                ++defaultBaseValue;
            }
            ++i;
            break;

            // if it's the negative-number rule, copy it into its own
            // data member and delete it from the list
        case NFRule::kNegativeNumberRule:
            if (negativeNumberRule) {
                delete negativeNumberRule;
            }
            negativeNumberRule = rules.remove(i);
            break;

            // if it's the improper fraction rule, copy it into the
            // correct element of fractionRules
        case NFRule::kImproperFractionRule:
            if (fractionRules[0]) {
                delete fractionRules[0];
            }
            fractionRules[0] = rules.remove(i);
            break;

            // if it's the proper fraction rule, copy it into the
            // correct element of fractionRules
        case NFRule::kProperFractionRule:
            if (fractionRules[1]) {
                delete fractionRules[1];
            }
            fractionRules[1] = rules.remove(i);
            break;

            // if it's the master rule, copy it into the
            // correct element of fractionRules
        case NFRule::kMasterRule:
            if (fractionRules[2]) {
                delete fractionRules[2];
            }
            fractionRules[2] = rules.remove(i);
            break;

            // if it's a regular rule that already knows its base value,
            // check to make sure the rules are in order, and update
            // the default base value for the next rule
        default:
            if (rule->getBaseValue() < defaultBaseValue) {
                // throw new IllegalArgumentException("Rules are not in order");
                status = U_PARSE_ERROR;
//.........这里部分代码省略.........

/**
 * If this is a >>> substitution, use ruleToUse to fill in
 * the substitution.  Otherwise, just use the superclass function.
 * @param number The number being formatted
 * @toInsertInto The string to insert the result of this substitution
 * into
 * @param pos The position of the rule text in toInsertInto
 */
void
ModulusSubstitution::doSubstitution(int64_t number, UnicodeString& toInsertInto, int32_t _pos) const
{
    // if this isn't a >>> substitution, just use the inherited version
    // of this function (which uses either a rule set or a DecimalFormat
    // to format its substitution value)
    if (ruleToUse == NULL) {
        NFSubstitution::doSubstitution(number, toInsertInto, _pos);

        // a >>> substitution goes straight to a particular rule to
        // format the substitution value
    } else {
        int64_t numberToFormat = transformNumber(number);
        ruleToUse->doFormat(numberToFormat, toInsertInto, _pos + getPos());
    }
}