ICU 56 update step 1

source/i18n/decimfmtimpl.cpp

Index: source/i18n/decimfmtimpl.cpp
diff --git a/source/i18n/decimfmtimpl.cpp b/source/i18n/decimfmtimpl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8493ecd03772f54748094433f81d084b6e94a519
--- /dev/null
+++ b/source/i18n/decimfmtimpl.cpp
@@ -0,0 +1,1594 @@
+/*
+ * Copyright (C) 2015, International Business Machines
+ * Corporation and others.  All Rights Reserved.
+ *
+ * file name: decimfmtimpl.cpp
+ */
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include <math.h>
+#include "unicode/numfmt.h"
+#include "unicode/plurrule.h"
+#include "unicode/ustring.h"
+#include "decimalformatpattern.h"
+#include "decimalformatpatternimpl.h"
+#include "decimfmtimpl.h"
+#include "fphdlimp.h"
+#include "plurrule_impl.h"
+#include "valueformatter.h"
+#include "visibledigits.h"
+
+U_NAMESPACE_BEGIN
+
+static const int32_t kMaxScientificIntegerDigits = 8;
+
+static const int32_t kFormattingPosPrefix = (1 << 0);
+static const int32_t kFormattingNegPrefix = (1 << 1);
+static const int32_t kFormattingPosSuffix = (1 << 2);
+static const int32_t kFormattingNegSuffix = (1 << 3);
+static const int32_t kFormattingSymbols = (1 << 4);
+static const int32_t kFormattingCurrency = (1 << 5);
+static const int32_t kFormattingUsesCurrency = (1 << 6);
+static const int32_t kFormattingPluralRules = (1 << 7);
+static const int32_t kFormattingAffixParser = (1 << 8);
+static const int32_t kFormattingCurrencyAffixInfo = (1 << 9);
+static const int32_t kFormattingAll = (1 << 10) - 1;
+static const int32_t kFormattingAffixes =
+        kFormattingPosPrefix | kFormattingPosSuffix |
+        kFormattingNegPrefix | kFormattingNegSuffix;
+static const int32_t kFormattingAffixParserWithCurrency =
+        kFormattingAffixParser | kFormattingCurrencyAffixInfo;
+
+DecimalFormatImpl::DecimalFormatImpl(
+        NumberFormat *super,
+        const Locale &locale,
+        const UnicodeString &pattern,
+        UErrorCode &status)
+        : fSuper(super),
+          fScale(0),
+          fRoundingMode(DecimalFormat::kRoundHalfEven),
+          fSymbols(NULL),
+          fCurrencyUsage(UCURR_USAGE_STANDARD),
+          fRules(NULL),
+          fMonetary(FALSE) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    fSymbols = new DecimalFormatSymbols(
+            locale, status);
+    if (fSymbols == NULL) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+        return;
+    }
+    UParseError parseError;
+    applyPattern(pattern, FALSE, parseError, status);
+    updateAll(status);
+}
+
+DecimalFormatImpl::DecimalFormatImpl(
+        NumberFormat *super,
+        const UnicodeString &pattern,
+        DecimalFormatSymbols *symbolsToAdopt,
+        UParseError &parseError,
+        UErrorCode &status)
+        : fSuper(super),
+          fScale(0),
+          fRoundingMode(DecimalFormat::kRoundHalfEven),
+          fSymbols(symbolsToAdopt),
+          fCurrencyUsage(UCURR_USAGE_STANDARD),
+          fRules(NULL),
+          fMonetary(FALSE) {
+    applyPattern(pattern, FALSE, parseError, status);
+    updateAll(status);
+}
+
+DecimalFormatImpl::DecimalFormatImpl(
+    NumberFormat *super, const DecimalFormatImpl &other, UErrorCode &status) :
+          fSuper(super),
+          fMultiplier(other.fMultiplier),
+          fScale(other.fScale),
+          fRoundingMode(other.fRoundingMode),
+          fMinSigDigits(other.fMinSigDigits),
+          fMaxSigDigits(other.fMaxSigDigits),
+          fUseScientific(other.fUseScientific),
+          fUseSigDigits(other.fUseSigDigits),
+          fGrouping(other.fGrouping),
+          fPositivePrefixPattern(other.fPositivePrefixPattern),
+          fNegativePrefixPattern(other.fNegativePrefixPattern),
+          fPositiveSuffixPattern(other.fPositiveSuffixPattern),
+          fNegativeSuffixPattern(other.fNegativeSuffixPattern),
+          fSymbols(other.fSymbols),
+          fCurrencyUsage(other.fCurrencyUsage),
+          fRules(NULL),
+          fMonetary(other.fMonetary),
+          fAffixParser(other.fAffixParser),
+          fCurrencyAffixInfo(other.fCurrencyAffixInfo),
+          fEffPrecision(other.fEffPrecision),
+          fEffGrouping(other.fEffGrouping),
+          fOptions(other.fOptions),
+          fFormatter(other.fFormatter),
+          fAffixes(other.fAffixes) {
+    fSymbols = new DecimalFormatSymbols(*fSymbols);
+    if (fSymbols == NULL && U_SUCCESS(status)) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+    }
+    if (other.fRules != NULL) {
+        fRules = new PluralRules(*other.fRules);
+        if (fRules == NULL && U_SUCCESS(status)) {
+            status = U_MEMORY_ALLOCATION_ERROR;
+        }
+    }
+}
+
+
+DecimalFormatImpl &
+DecimalFormatImpl::assign(const DecimalFormatImpl &other, UErrorCode &status) {
+    if (U_FAILURE(status) || this == &other) {
+        return (*this);
+    }
+    UObject::operator=(other);
+    fMultiplier = other.fMultiplier;
+    fScale = other.fScale;
+    fRoundingMode = other.fRoundingMode;
+    fMinSigDigits = other.fMinSigDigits;
+    fMaxSigDigits = other.fMaxSigDigits;
+    fUseScientific = other.fUseScientific;
+    fUseSigDigits = other.fUseSigDigits;
+    fGrouping = other.fGrouping;
+    fPositivePrefixPattern = other.fPositivePrefixPattern;
+    fNegativePrefixPattern = other.fNegativePrefixPattern;
+    fPositiveSuffixPattern = other.fPositiveSuffixPattern;
+    fNegativeSuffixPattern = other.fNegativeSuffixPattern;
+    fCurrencyUsage = other.fCurrencyUsage;
+    fMonetary = other.fMonetary;
+    fAffixParser = other.fAffixParser;
+    fCurrencyAffixInfo = other.fCurrencyAffixInfo;
+    fEffPrecision = other.fEffPrecision;
+    fEffGrouping = other.fEffGrouping;
+    fOptions = other.fOptions;
+    fFormatter = other.fFormatter;
+    fAffixes = other.fAffixes;
+    *fSymbols = *other.fSymbols;
+    if (fRules != NULL && other.fRules != NULL) {
+        *fRules = *other.fRules;
+    } else {
+        delete fRules;
+        fRules = other.fRules;
+        if (fRules != NULL) {
+            fRules = new PluralRules(*fRules);
+            if (fRules == NULL) {
+                status = U_MEMORY_ALLOCATION_ERROR;
+                return *this;
+            }
+        }
+    }
+    return *this;
+}
+
+UBool
+DecimalFormatImpl::operator==(const DecimalFormatImpl &other) const {
+    if (this == &other) {
+        return TRUE;
+    }
+    return (fMultiplier == other.fMultiplier)
+            && (fScale == other.fScale)
+            && (fRoundingMode == other.fRoundingMode)
+            && (fMinSigDigits == other.fMinSigDigits)
+            && (fMaxSigDigits == other.fMaxSigDigits)
+            && (fUseScientific == other.fUseScientific)
+            && (fUseSigDigits == other.fUseSigDigits)
+            && fGrouping.equals(other.fGrouping)
+            && fPositivePrefixPattern.equals(other.fPositivePrefixPattern)
+            && fNegativePrefixPattern.equals(other.fNegativePrefixPattern)
+            && fPositiveSuffixPattern.equals(other.fPositiveSuffixPattern)
+            && fNegativeSuffixPattern.equals(other.fNegativeSuffixPattern)
+            && fCurrencyUsage == other.fCurrencyUsage
+            && fAffixParser.equals(other.fAffixParser)
+            && fCurrencyAffixInfo.equals(other.fCurrencyAffixInfo)
+            && fEffPrecision.equals(other.fEffPrecision)
+            && fEffGrouping.equals(other.fEffGrouping)
+            && fOptions.equals(other.fOptions)
+            && fFormatter.equals(other.fFormatter)
+            && fAffixes.equals(other.fAffixes)
+            && (*fSymbols == *other.fSymbols)
+            && ((fRules == other.fRules) || (
+                    (fRules != NULL) && (other.fRules != NULL)
+                    && (*fRules == *other.fRules)))
+            && (fMonetary == other.fMonetary);
+}
+
+DecimalFormatImpl::~DecimalFormatImpl() {
+    delete fSymbols;
+    delete fRules;
+}
+
+ValueFormatter &
+DecimalFormatImpl::prepareValueFormatter(ValueFormatter &vf) const {
+    if (fUseScientific) {
+        vf.prepareScientificFormatting(
+                fFormatter, fEffPrecision, fOptions);
+        return vf;
+    }
+    vf.prepareFixedDecimalFormatting(
+            fFormatter, fEffGrouping, fEffPrecision.fMantissa, fOptions.fMantissa);
+    return vf;
+}
+
+int32_t
+DecimalFormatImpl::getPatternScale() const {
+    UBool usesPercent = fPositivePrefixPattern.usesPercent() || 
+            fPositiveSuffixPattern.usesPercent() || 
+            fNegativePrefixPattern.usesPercent() || 
+            fNegativeSuffixPattern.usesPercent();
+    if (usesPercent) {
+        return 2;
+    }
+    UBool usesPermill = fPositivePrefixPattern.usesPermill() || 
+            fPositiveSuffixPattern.usesPermill() || 
+            fNegativePrefixPattern.usesPermill() || 
+            fNegativeSuffixPattern.usesPermill();
+    if (usesPermill) {
+        return 3;
+    }
+    return 0;
+}
+    
+void
+DecimalFormatImpl::setMultiplierScale(int32_t scale) {
+    if (scale == 0) {
+        // Needed to preserve equality. fMultiplier == 0 means
+        // multiplier is 1.
+        fMultiplier.set(0);
+    } else {
+        fMultiplier.set(1);
+        fMultiplier.shiftDecimalRight(scale);
+    }
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        int32_t number,
+        UnicodeString &appendTo,
+        FieldPosition &pos,
+        UErrorCode &status) const {
+    FieldPositionOnlyHandler handler(pos);
+    return formatInt32(number, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        int32_t number,
+        UnicodeString &appendTo,
+        FieldPositionIterator *posIter,
+        UErrorCode &status) const {
+    FieldPositionIteratorHandler handler(posIter, status);
+    return formatInt32(number, appendTo, handler, status);
+}
+
+template<class T>
+UBool DecimalFormatImpl::maybeFormatWithDigitList(
+        T number,
+        UnicodeString &appendTo,
+        FieldPositionHandler &handler,
+        UErrorCode &status) const {
+    if (!fMultiplier.isZero()) {
+        DigitList digits;
+        digits.set(number);
+        digits.mult(fMultiplier, status);
+        digits.shiftDecimalRight(fScale);
+        formatAdjustedDigitList(digits, appendTo, handler, status);
+        return TRUE;
+    }
+    if (fScale != 0) {
+        DigitList digits;
+        digits.set(number);
+        digits.shiftDecimalRight(fScale);
+        formatAdjustedDigitList(digits, appendTo, handler, status);
+        return TRUE;
+    }
+    return FALSE;
+}
+
+template<class T>
+UBool DecimalFormatImpl::maybeInitVisibleDigitsFromDigitList(
+        T number,
+        VisibleDigitsWithExponent &visibleDigits,
+        UErrorCode &status) const {
+    if (!fMultiplier.isZero()) {
+        DigitList digits;
+        digits.set(number);
+        digits.mult(fMultiplier, status);
+        digits.shiftDecimalRight(fScale);
+        initVisibleDigitsFromAdjusted(digits, visibleDigits, status);
+        return TRUE;
+    }
+    if (fScale != 0) {
+        DigitList digits;
+        digits.set(number);
+        digits.shiftDecimalRight(fScale);
+        initVisibleDigitsFromAdjusted(digits, visibleDigits, status);
+        return TRUE;
+    }
+    return FALSE;
+}
+
+UnicodeString &
+DecimalFormatImpl::formatInt32(
+        int32_t number,
+        UnicodeString &appendTo,
+        FieldPositionHandler &handler,
+        UErrorCode &status) const {
+    if (maybeFormatWithDigitList(number, appendTo, handler, status)) {
+        return appendTo;
+    }
+    ValueFormatter vf;
+    return fAffixes.formatInt32(
+            number,
+            prepareValueFormatter(vf),
+            handler,
+            fRules,
+            appendTo,
+            status);
+}
+
+UnicodeString &
+DecimalFormatImpl::formatInt64(
+        int64_t number,
+        UnicodeString &appendTo,
+        FieldPositionHandler &handler,
+        UErrorCode &status) const {
+    if (number >= INT32_MIN && number <= INT32_MAX) {
+        return formatInt32((int32_t) number, appendTo, handler, status);
+    }
+    VisibleDigitsWithExponent digits;
+    initVisibleDigitsWithExponent(number, digits, status);
+    return formatVisibleDigitsWithExponent(
+            digits, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::formatDouble(
+        double number,
+        UnicodeString &appendTo,
+        FieldPositionHandler &handler,
+        UErrorCode &status) const {
+    VisibleDigitsWithExponent digits;
+    initVisibleDigitsWithExponent(number, digits, status);
+    return formatVisibleDigitsWithExponent(
+            digits, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        double number,
+        UnicodeString &appendTo,
+        FieldPosition &pos,
+        UErrorCode &status) const {
+    FieldPositionOnlyHandler handler(pos);
+    return formatDouble(number, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        const DigitList &number,
+        UnicodeString &appendTo,
+        FieldPosition &pos,
+        UErrorCode &status) const {
+    DigitList dl(number);
+    FieldPositionOnlyHandler handler(pos);
+    return formatDigitList(dl, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        int64_t number,
+        UnicodeString &appendTo,
+        FieldPosition &pos,
+        UErrorCode &status) const {
+    FieldPositionOnlyHandler handler(pos);
+    return formatInt64(number, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        int64_t number,
+        UnicodeString &appendTo,
+        FieldPositionIterator *posIter,
+        UErrorCode &status) const {
+    FieldPositionIteratorHandler handler(posIter, status);
+    return formatInt64(number, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        double number,
+        UnicodeString &appendTo,
+        FieldPositionIterator *posIter,
+        UErrorCode &status) const {
+    FieldPositionIteratorHandler handler(posIter, status);
+    return formatDouble(number, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        const DigitList &number,
+        UnicodeString &appendTo,
+        FieldPositionIterator *posIter,
+        UErrorCode &status) const {
+    DigitList dl(number);
+    FieldPositionIteratorHandler handler(posIter, status);
+    return formatDigitList(dl, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        const StringPiece &number,
+        UnicodeString &appendTo,
+        FieldPositionIterator *posIter,
+        UErrorCode &status) const {
+    DigitList dl;
+    dl.set(number, status);
+    FieldPositionIteratorHandler handler(posIter, status);
+    return formatDigitList(dl, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        const VisibleDigitsWithExponent &digits,
+        UnicodeString &appendTo,
+        FieldPosition &pos,
+        UErrorCode &status) const {
+    FieldPositionOnlyHandler handler(pos);
+    return formatVisibleDigitsWithExponent(
+            digits, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::format(
+        const VisibleDigitsWithExponent &digits,
+        UnicodeString &appendTo,
+        FieldPositionIterator *posIter,
+        UErrorCode &status) const {
+    FieldPositionIteratorHandler handler(posIter, status);
+    return formatVisibleDigitsWithExponent(
+            digits, appendTo, handler, status);
+}
+
+DigitList &
+DecimalFormatImpl::adjustDigitList(
+        DigitList &number, UErrorCode &status) const {
+    number.setRoundingMode(fRoundingMode);
+    if (!fMultiplier.isZero()) {
+        number.mult(fMultiplier, status);
+    }
+    if (fScale != 0) {
+        number.shiftDecimalRight(fScale);
+    }
+    number.reduce();
+    return number;
+}
+
+UnicodeString &
+DecimalFormatImpl::formatDigitList(
+        DigitList &number,
+        UnicodeString &appendTo,
+        FieldPositionHandler &handler,
+        UErrorCode &status) const {
+    VisibleDigitsWithExponent digits;
+    initVisibleDigitsWithExponent(number, digits, status);
+    return formatVisibleDigitsWithExponent(
+            digits, appendTo, handler, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::formatAdjustedDigitList(
+        DigitList &number,
+        UnicodeString &appendTo,
+        FieldPositionHandler &handler,
+        UErrorCode &status) const {
+    ValueFormatter vf;
+    return fAffixes.format(
+            number,
+            prepareValueFormatter(vf),
+            handler,
+            fRules,
+            appendTo,
+            status);
+}
+
+UnicodeString &
+DecimalFormatImpl::formatVisibleDigitsWithExponent(
+        const VisibleDigitsWithExponent &digits,
+        UnicodeString &appendTo,
+        FieldPositionHandler &handler,
+        UErrorCode &status) const {
+    ValueFormatter vf;
+    return fAffixes.format(
+            digits,
+            prepareValueFormatter(vf),
+            handler,
+            fRules,
+            appendTo,
+            status);
+}
+
+static FixedDecimal &initFixedDecimal(
+        const VisibleDigits &digits, FixedDecimal &result) {
+    result.source = 0.0;
+    result.isNegative = digits.isNegative();
+    result.isNanOrInfinity = digits.isNaNOrInfinity();
+    digits.getFixedDecimal(
+            result.source, result.intValue, result.decimalDigits,
+            result.decimalDigitsWithoutTrailingZeros,
+            result.visibleDecimalDigitCount, result.hasIntegerValue);
+    return result;
+}
+
+FixedDecimal &
+DecimalFormatImpl::getFixedDecimal(double number, FixedDecimal &result, UErrorCode &status) const {
+    if (U_FAILURE(status)) {
+        return result;
+    }
+    VisibleDigits digits;
+    fEffPrecision.fMantissa.initVisibleDigits(number, digits, status);
+    return initFixedDecimal(digits, result);
+}
+
+FixedDecimal &
+DecimalFormatImpl::getFixedDecimal(
+        DigitList &number, FixedDecimal &result, UErrorCode &status) const {
+    if (U_FAILURE(status)) {
+        return result;
+    }
+    VisibleDigits digits;
+    fEffPrecision.fMantissa.initVisibleDigits(number, digits, status);
+    return initFixedDecimal(digits, result);
+}
+
+VisibleDigitsWithExponent &
+DecimalFormatImpl::initVisibleDigitsWithExponent(
+        int64_t number,
+        VisibleDigitsWithExponent &digits,
+        UErrorCode &status) const {
+    if (maybeInitVisibleDigitsFromDigitList(
+            number, digits, status)) {
+        return digits;
+    }
+    if (fUseScientific) {
+        fEffPrecision.initVisibleDigitsWithExponent(
+                number, digits, status);
+    } else {
+        fEffPrecision.fMantissa.initVisibleDigitsWithExponent(
+                number, digits, status);
+    }
+    return digits;
+}
+
+VisibleDigitsWithExponent &
+DecimalFormatImpl::initVisibleDigitsWithExponent(
+        double number,
+        VisibleDigitsWithExponent &digits,
+        UErrorCode &status) const {
+    if (maybeInitVisibleDigitsFromDigitList(
+            number, digits, status)) {
+        return digits;
+    }
+    if (fUseScientific) {
+        fEffPrecision.initVisibleDigitsWithExponent(
+                number, digits, status);
+    } else {
+        fEffPrecision.fMantissa.initVisibleDigitsWithExponent(
+                number, digits, status);
+    }
+    return digits;
+}
+
+VisibleDigitsWithExponent &
+DecimalFormatImpl::initVisibleDigitsWithExponent(
+        DigitList &number,
+        VisibleDigitsWithExponent &digits,
+        UErrorCode &status) const {
+    adjustDigitList(number, status);
+    return initVisibleDigitsFromAdjusted(number, digits, status);
+}
+
+VisibleDigitsWithExponent &
+DecimalFormatImpl::initVisibleDigitsFromAdjusted(
+        DigitList &number,
+        VisibleDigitsWithExponent &digits,
+        UErrorCode &status) const {
+    if (fUseScientific) {
+        fEffPrecision.initVisibleDigitsWithExponent(
+                number, digits, status);
+    } else {
+        fEffPrecision.fMantissa.initVisibleDigitsWithExponent(
+                number, digits, status);
+    }
+    return digits;
+}
+
+DigitList &
+DecimalFormatImpl::round(
+        DigitList &number, UErrorCode &status) const {
+    if (number.isNaN() || number.isInfinite()) {
+        return number;
+    }
+    adjustDigitList(number, status);
+    ValueFormatter vf;
+    prepareValueFormatter(vf);
+    return vf.round(number, status);
+}
+
+void
+DecimalFormatImpl::setMinimumSignificantDigits(int32_t newValue) {
+    fMinSigDigits = newValue;
+    fUseSigDigits = TRUE; // ticket 9936
+    updatePrecision();
+}
+        
+void
+DecimalFormatImpl::setMaximumSignificantDigits(int32_t newValue) {
+    fMaxSigDigits = newValue;
+    fUseSigDigits = TRUE; // ticket 9936
+    updatePrecision();
+}
+
+void
+DecimalFormatImpl::setMinMaxSignificantDigits(int32_t min, int32_t max) {
+    fMinSigDigits = min;
+    fMaxSigDigits = max;
+    fUseSigDigits = TRUE; // ticket 9936
+    updatePrecision();
+}
+
+void
+DecimalFormatImpl::setScientificNotation(UBool newValue) {
+    fUseScientific = newValue;
+    updatePrecision();
+}
+        
+void
+DecimalFormatImpl::setSignificantDigitsUsed(UBool newValue) {
+    fUseSigDigits = newValue;
+    updatePrecision();
+}
+        
+void
+DecimalFormatImpl::setGroupingSize(int32_t newValue) {
+    fGrouping.fGrouping = newValue;
+    updateGrouping();
+}
+
+void
+DecimalFormatImpl::setSecondaryGroupingSize(int32_t newValue) {
+    fGrouping.fGrouping2 = newValue;
+    updateGrouping();
+}
+
+void
+DecimalFormatImpl::setMinimumGroupingDigits(int32_t newValue) {
+    fGrouping.fMinGrouping = newValue;
+    updateGrouping();
+}
+
+void
+DecimalFormatImpl::setCurrencyUsage(
+        UCurrencyUsage currencyUsage, UErrorCode &status) {
+    fCurrencyUsage = currencyUsage;
+    updateFormatting(kFormattingCurrency, status);
+}
+
+void
+DecimalFormatImpl::setRoundingIncrement(double d) {
+    if (d > 0.0) {
+        fEffPrecision.fMantissa.fRoundingIncrement.set(d);
+    } else {
+        fEffPrecision.fMantissa.fRoundingIncrement.set(0.0);
+    }
+}
+
+double
+DecimalFormatImpl::getRoundingIncrement() const {
+    return fEffPrecision.fMantissa.fRoundingIncrement.getDouble();
+}
+
+int32_t
+DecimalFormatImpl::getMultiplier() const {
+    if (fMultiplier.isZero()) {
+        return 1;
+    }
+    return (int32_t) fMultiplier.getDouble();
+}
+
+void
+DecimalFormatImpl::setMultiplier(int32_t m) {
+    if (m == 0 || m == 1) {
+        fMultiplier.set(0);
+    } else {
+        fMultiplier.set(m);
+    }
+}
+
+void
+DecimalFormatImpl::setPositivePrefix(const UnicodeString &str) {
+    fPositivePrefixPattern.remove();
+    fPositivePrefixPattern.addLiteral(str.getBuffer(), 0, str.length());
+    UErrorCode status = U_ZERO_ERROR;
+    updateFormatting(kFormattingPosPrefix, status);
+}
+
+void
+DecimalFormatImpl::setPositiveSuffix(const UnicodeString &str) {
+    fPositiveSuffixPattern.remove();
+    fPositiveSuffixPattern.addLiteral(str.getBuffer(), 0, str.length());
+    UErrorCode status = U_ZERO_ERROR;
+    updateFormatting(kFormattingPosSuffix, status);
+}
+
+void
+DecimalFormatImpl::setNegativePrefix(const UnicodeString &str) {
+    fNegativePrefixPattern.remove();
+    fNegativePrefixPattern.addLiteral(str.getBuffer(), 0, str.length());
+    UErrorCode status = U_ZERO_ERROR;
+    updateFormatting(kFormattingNegPrefix, status);
+}
+
+void
+DecimalFormatImpl::setNegativeSuffix(const UnicodeString &str) {
+    fNegativeSuffixPattern.remove();
+    fNegativeSuffixPattern.addLiteral(str.getBuffer(), 0, str.length());
+    UErrorCode status = U_ZERO_ERROR;
+    updateFormatting(kFormattingNegSuffix, status);
+}
+
+UnicodeString &
+DecimalFormatImpl::getPositivePrefix(UnicodeString &result) const {
+    result = fAffixes.fPositivePrefix.getOtherVariant().toString();
+    return result;
+}
+
+UnicodeString &
+DecimalFormatImpl::getPositiveSuffix(UnicodeString &result) const {
+    result = fAffixes.fPositiveSuffix.getOtherVariant().toString();
+    return result;
+}
+
+UnicodeString &
+DecimalFormatImpl::getNegativePrefix(UnicodeString &result) const {
+    result = fAffixes.fNegativePrefix.getOtherVariant().toString();
+    return result;
+}
+
+UnicodeString &
+DecimalFormatImpl::getNegativeSuffix(UnicodeString &result) const {
+    result = fAffixes.fNegativeSuffix.getOtherVariant().toString();
+    return result;
+}
+
+void
+DecimalFormatImpl::adoptDecimalFormatSymbols(DecimalFormatSymbols *symbolsToAdopt) {
+    if (symbolsToAdopt == NULL) {
+        return;
+    }
+    delete fSymbols;
+    fSymbols = symbolsToAdopt;
+    UErrorCode status = U_ZERO_ERROR;
+    updateFormatting(kFormattingSymbols, status);
+}
+
+void
+DecimalFormatImpl::applyPatternFavorCurrencyPrecision(
+        const UnicodeString &pattern, UErrorCode &status) {
+    UParseError perror;
+    applyPattern(pattern, FALSE, perror, status);
+    updateForApplyPatternFavorCurrencyPrecision(status);
+}
+
+void
+DecimalFormatImpl::applyPattern(
+        const UnicodeString &pattern, UErrorCode &status) {
+    UParseError perror;
+    applyPattern(pattern, FALSE, perror, status);
+    updateForApplyPattern(status);
+}
+
+void
+DecimalFormatImpl::applyPattern(
+        const UnicodeString &pattern,
+        UParseError &perror, UErrorCode &status) {
+    applyPattern(pattern, FALSE, perror, status);
+    updateForApplyPattern(status);
+}
+
+void
+DecimalFormatImpl::applyLocalizedPattern(
+        const UnicodeString &pattern, UErrorCode &status) {
+    UParseError perror;
+    applyPattern(pattern, TRUE, perror, status);
+    updateForApplyPattern(status);
+}
+
+void
+DecimalFormatImpl::applyLocalizedPattern(
+        const UnicodeString &pattern,
+        UParseError &perror,  UErrorCode &status) {
+    applyPattern(pattern, TRUE, perror, status);
+    updateForApplyPattern(status);
+}
+
+void
+DecimalFormatImpl::applyPattern(
+        const UnicodeString &pattern,
+        UBool localized, UParseError &perror, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    DecimalFormatPatternParser patternParser;
+    if (localized) {
+        patternParser.useSymbols(*fSymbols);
+    }
+    DecimalFormatPattern out;
+    patternParser.applyPatternWithoutExpandAffix(
+            pattern, out, perror, status);
+    if (U_FAILURE(status)) {
+        return;
+    }
+    fUseScientific = out.fUseExponentialNotation;
+    fUseSigDigits = out.fUseSignificantDigits;
+    fSuper->NumberFormat::setMinimumIntegerDigits(out.fMinimumIntegerDigits);
+    fSuper->NumberFormat::setMaximumIntegerDigits(out.fMaximumIntegerDigits);
+    fSuper->NumberFormat::setMinimumFractionDigits(out.fMinimumFractionDigits);
+    fSuper->NumberFormat::setMaximumFractionDigits(out.fMaximumFractionDigits);
+    fMinSigDigits = out.fMinimumSignificantDigits;
+    fMaxSigDigits = out.fMaximumSignificantDigits;
+    fEffPrecision.fMinExponentDigits = out.fMinExponentDigits;
+    fOptions.fExponent.fAlwaysShowSign = out.fExponentSignAlwaysShown;
+    fSuper->NumberFormat::setGroupingUsed(out.fGroupingUsed);
+    fGrouping.fGrouping = out.fGroupingSize;
+    fGrouping.fGrouping2 = out.fGroupingSize2;
+    fOptions.fMantissa.fAlwaysShowDecimal = out.fDecimalSeparatorAlwaysShown;
+    if (out.fRoundingIncrementUsed) {
+        fEffPrecision.fMantissa.fRoundingIncrement = out.fRoundingIncrement;
+    } else {
+        fEffPrecision.fMantissa.fRoundingIncrement.clear();
+    }
+    fAffixes.fPadChar = out.fPad;
+    fNegativePrefixPattern = out.fNegPrefixAffix;
+    fNegativeSuffixPattern = out.fNegSuffixAffix;
+    fPositivePrefixPattern = out.fPosPrefixAffix;
+    fPositiveSuffixPattern = out.fPosSuffixAffix;
+
+    // Work around. Pattern parsing code and DecimalFormat code don't agree
+    // on the definition of field width, so we have to translate from
+    // pattern field width to decimal format field width here.
+    fAffixes.fWidth = out.fFormatWidth == 0 ? 0 :
+            out.fFormatWidth + fPositivePrefixPattern.countChar32()
+            + fPositiveSuffixPattern.countChar32();
+    switch (out.fPadPosition) {
+    case DecimalFormatPattern::kPadBeforePrefix:
+        fAffixes.fPadPosition = DigitAffixesAndPadding::kPadBeforePrefix;
+        break;    
+    case DecimalFormatPattern::kPadAfterPrefix:
+        fAffixes.fPadPosition = DigitAffixesAndPadding::kPadAfterPrefix;
+        break;    
+    case DecimalFormatPattern::kPadBeforeSuffix:
+        fAffixes.fPadPosition = DigitAffixesAndPadding::kPadBeforeSuffix;
+        break;    
+    case DecimalFormatPattern::kPadAfterSuffix:
+        fAffixes.fPadPosition = DigitAffixesAndPadding::kPadAfterSuffix;
+        break;    
+    default:
+        break;
+    }
+}
+
+void
+DecimalFormatImpl::updatePrecision() {
+    if (fUseScientific) {
+        updatePrecisionForScientific();
+    } else {
+        updatePrecisionForFixed();
+    }
+}
+
+static void updatePrecisionForScientificMinMax(
+        const DigitInterval &min,
+        const DigitInterval &max,
+        DigitInterval &resultMin,
+        DigitInterval &resultMax,
+        SignificantDigitInterval &resultSignificant) {
+    resultMin.setIntDigitCount(0);
+    resultMin.setFracDigitCount(0);
+    resultSignificant.clear();
+    resultMax.clear();
+    
+    int32_t maxIntDigitCount = max.getIntDigitCount();
+    int32_t minIntDigitCount = min.getIntDigitCount();
+    int32_t maxFracDigitCount = max.getFracDigitCount();
+    int32_t minFracDigitCount = min.getFracDigitCount();
+
+
+    // Not in spec: maxIntDigitCount > 8 assume
+    // maxIntDigitCount = minIntDigitCount. Current DecimalFormat API has
+    // no provision for unsetting maxIntDigitCount which would be useful for
+    // scientific notation. The best we can do is assume that if
+    // maxIntDigitCount is the default of 2000000000 or is "big enough" then
+    // user did not intend to explicitly set it. The 8 was derived emperically
+    // by extensive testing of legacy code.
+    if (maxIntDigitCount > 8) {
+        maxIntDigitCount = minIntDigitCount;
+    }
+
+    // Per the spec, exponent grouping happens if maxIntDigitCount is more
+    // than 1 and more than minIntDigitCount.
+    UBool bExponentGrouping = maxIntDigitCount > 1 && minIntDigitCount < maxIntDigitCount;
+    if (bExponentGrouping) {
+        resultMax.setIntDigitCount(maxIntDigitCount);
+
+        // For exponent grouping minIntDigits is always treated as 1 even
+        // if it wasn't set to 1!
+        resultMin.setIntDigitCount(1);
+    } else {
+        // Fixed digit count left of decimal. minIntDigitCount doesn't have
+        // to equal maxIntDigitCount i.e minIntDigitCount == 0 while
+        // maxIntDigitCount == 1.
+        int32_t fixedIntDigitCount = maxIntDigitCount;
+
+        // If fixedIntDigitCount is 0 but
+        // min or max fraction count is 0 too then use 1. This way we can get
+        // unlimited precision for X.XXXEX
+        if (fixedIntDigitCount == 0 && (minFracDigitCount == 0 || maxFracDigitCount == 0)) {
+            fixedIntDigitCount = 1;
+        }
+        resultMax.setIntDigitCount(fixedIntDigitCount);
+        resultMin.setIntDigitCount(fixedIntDigitCount);
+    }
+    // Spec says this is how we compute significant digits. 0 means
+    // unlimited significant digits.
+    int32_t maxSigDigits = minIntDigitCount + maxFracDigitCount;
+    if (maxSigDigits > 0) {
+        int32_t minSigDigits = minIntDigitCount + minFracDigitCount;
+        resultSignificant.setMin(minSigDigits);
+        resultSignificant.setMax(maxSigDigits);
+    }
+}
+
+void
+DecimalFormatImpl::updatePrecisionForScientific() {
+    FixedPrecision *result = &fEffPrecision.fMantissa;
+    if (fUseSigDigits) {
+        result->fMax.setFracDigitCount(-1);
+        result->fMax.setIntDigitCount(1);
+        result->fMin.setFracDigitCount(0);
+        result->fMin.setIntDigitCount(1);
+        result->fSignificant.clear();
+        extractSigDigits(result->fSignificant);
+        return;
+    }
+    DigitInterval max;
+    DigitInterval min;
+    extractMinMaxDigits(min, max);
+    updatePrecisionForScientificMinMax(
+            min, max,
+            result->fMin, result->fMax, result->fSignificant);
+}
+
+void
+DecimalFormatImpl::updatePrecisionForFixed() {
+    FixedPrecision *result = &fEffPrecision.fMantissa;
+    if (!fUseSigDigits) {
+        extractMinMaxDigits(result->fMin, result->fMax);
+        result->fSignificant.clear();
+    } else {
+        extractSigDigits(result->fSignificant);
+        result->fMin.setIntDigitCount(1);
+        result->fMin.setFracDigitCount(0);
+        result->fMax.clear();
+    }
+}
+
+void
+ DecimalFormatImpl::extractMinMaxDigits(
+        DigitInterval &min, DigitInterval &max) const {
+    min.setIntDigitCount(fSuper->getMinimumIntegerDigits());
+    max.setIntDigitCount(fSuper->getMaximumIntegerDigits());
+    min.setFracDigitCount(fSuper->getMinimumFractionDigits());
+    max.setFracDigitCount(fSuper->getMaximumFractionDigits());
+}
+
+void
+ DecimalFormatImpl::extractSigDigits(
+        SignificantDigitInterval &sig) const {
+    sig.setMin(fMinSigDigits < 0 ? 0 : fMinSigDigits);
+    sig.setMax(fMaxSigDigits < 0 ? 0 : fMaxSigDigits);
+}
+
+void
+DecimalFormatImpl::updateGrouping() {
+    if (fSuper->isGroupingUsed()) {
+        fEffGrouping = fGrouping;
+    } else {
+        fEffGrouping.clear();
+    }
+}
+
+void
+DecimalFormatImpl::updateCurrency(UErrorCode &status) {
+    updateFormatting(kFormattingCurrency, TRUE, status);
+}
+
+void
+DecimalFormatImpl::updateFormatting(
+        int32_t changedFormattingFields,
+        UErrorCode &status) {
+    updateFormatting(changedFormattingFields, TRUE, status);
+}
+
+void
+DecimalFormatImpl::updateFormatting(
+        int32_t changedFormattingFields,
+        UBool updatePrecisionBasedOnCurrency,
+        UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    // Each function updates one field. Order matters. For instance,
+    // updatePluralRules comes before updateCurrencyAffixInfo because the
+    // fRules field is needed to update the fCurrencyAffixInfo field.
+    updateFormattingUsesCurrency(changedFormattingFields);
+    updateFormattingFixedPointFormatter(changedFormattingFields);
+    updateFormattingAffixParser(changedFormattingFields);
+    updateFormattingPluralRules(changedFormattingFields, status);
+    updateFormattingCurrencyAffixInfo(
+            changedFormattingFields,
+            updatePrecisionBasedOnCurrency,
+            status);
+    updateFormattingLocalizedPositivePrefix(
+            changedFormattingFields, status);
+    updateFormattingLocalizedPositiveSuffix(
+            changedFormattingFields, status);
+    updateFormattingLocalizedNegativePrefix(
+            changedFormattingFields, status);
+    updateFormattingLocalizedNegativeSuffix(
+            changedFormattingFields, status);
+}
+
+void
+DecimalFormatImpl::updateFormattingUsesCurrency(
+        int32_t &changedFormattingFields) {
+    if ((changedFormattingFields & kFormattingAffixes) == 0) {
+        // If no affixes changed, don't need to do any work
+        return;
+    }
+    UBool newUsesCurrency =
+            fPositivePrefixPattern.usesCurrency() ||
+            fPositiveSuffixPattern.usesCurrency() ||
+            fNegativePrefixPattern.usesCurrency() ||
+            fNegativeSuffixPattern.usesCurrency();
+    if (fMonetary != newUsesCurrency) {
+        fMonetary = newUsesCurrency;
+        changedFormattingFields |= kFormattingUsesCurrency;
+    }
+}
+
+void
+DecimalFormatImpl::updateFormattingPluralRules(
+        int32_t &changedFormattingFields, UErrorCode &status) {
+    if ((changedFormattingFields & (kFormattingSymbols | kFormattingUsesCurrency)) == 0) {
+        // No work to do if both fSymbols and fMonetary
+        // fields are unchanged
+        return;
+    }
+    if (U_FAILURE(status)) {
+        return;
+    }
+    PluralRules *newRules = NULL;
+    if (fMonetary) {
+        newRules = PluralRules::forLocale(fSymbols->getLocale(), status);
+        if (U_FAILURE(status)) {
+            return;
+        }
+    }
+    // Its ok to say a field has changed when it really hasn't but not
+    // the other way around. Here we assume the field changed unless it
+    // was NULL before and is still NULL now
+    if (fRules != newRules) {
+        delete fRules;
+        fRules = newRules;
+        changedFormattingFields |= kFormattingPluralRules;
+    }
+}
+
+void
+DecimalFormatImpl::updateFormattingCurrencyAffixInfo(
+        int32_t &changedFormattingFields,
+        UBool updatePrecisionBasedOnCurrency,
+        UErrorCode &status) {
+    if ((changedFormattingFields & (
+            kFormattingSymbols | kFormattingCurrency |
+            kFormattingUsesCurrency | kFormattingPluralRules)) == 0) {
+        // If all these fields are unchanged, no work to do.
+        return;
+    }
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if (!fMonetary) {
+        if (fCurrencyAffixInfo.isDefault()) {
+            // In this case don't have to do any work
+            return;
+        }
+        fCurrencyAffixInfo.set(NULL, NULL, NULL, status);
+        if (U_FAILURE(status)) {
+            return;
+        }
+        changedFormattingFields |= kFormattingCurrencyAffixInfo;
+    } else {
+        const UChar *currency = fSuper->getCurrency();
+        UChar localeCurr[4];
+        if (currency[0] == 0) {
+            ucurr_forLocale(fSymbols->getLocale().getName(), localeCurr, UPRV_LENGTHOF(localeCurr), &status);
+            if (U_SUCCESS(status)) {
+                currency = localeCurr;
+                fSuper->NumberFormat::setCurrency(currency, status);
+            } else {
+                currency = NULL;
+                status = U_ZERO_ERROR;
+            }
+        }
+        fCurrencyAffixInfo.set(
+                fSymbols->getLocale().getName(), fRules, currency, status);
+        if (U_FAILURE(status)) {
+            return;
+        }
+        UBool customCurrencySymbol = FALSE;
+        // If DecimalFormatSymbols has custom currency symbol, prefer
+        // that over what we just read from the resource bundles
+        if (fSymbols->isCustomCurrencySymbol()) {
+            fCurrencyAffixInfo.setSymbol(
+                    fSymbols->getConstSymbol(DecimalFormatSymbols::kCurrencySymbol));
+            customCurrencySymbol = TRUE;
+        }
+        if (fSymbols->isCustomIntlCurrencySymbol()) {
+            fCurrencyAffixInfo.setISO(
+                    fSymbols->getConstSymbol(DecimalFormatSymbols::kIntlCurrencySymbol));
+            customCurrencySymbol = TRUE;
+        }
+        changedFormattingFields |= kFormattingCurrencyAffixInfo;
+        if (currency && !customCurrencySymbol && updatePrecisionBasedOnCurrency) {
+            FixedPrecision precision;
+            CurrencyAffixInfo::adjustPrecision(
+                    currency, fCurrencyUsage, precision, status);
+            if (U_FAILURE(status)) {
+                return;
+            }
+            fSuper->NumberFormat::setMinimumFractionDigits(
+                    precision.fMin.getFracDigitCount());
+            fSuper->NumberFormat::setMaximumFractionDigits(
+                    precision.fMax.getFracDigitCount());
+            updatePrecision();
+            fEffPrecision.fMantissa.fRoundingIncrement =
+                    precision.fRoundingIncrement;
+        }
+ 
+    }
+}
+
+void
+DecimalFormatImpl::updateFormattingFixedPointFormatter(
+        int32_t &changedFormattingFields) {
+    if ((changedFormattingFields & (kFormattingSymbols | kFormattingUsesCurrency)) == 0) {
+        // No work to do if fSymbols is unchanged
+        return;
+    }
+    if (fMonetary) {
+        fFormatter.setDecimalFormatSymbolsForMonetary(*fSymbols);
+    } else {
+        fFormatter.setDecimalFormatSymbols(*fSymbols);
+    }
+}
+
+void
+DecimalFormatImpl::updateFormattingAffixParser(
+        int32_t &changedFormattingFields) {
+    if ((changedFormattingFields & kFormattingSymbols) == 0) {
+        // No work to do if fSymbols is unchanged
+        return;
+    }
+    fAffixParser.setDecimalFormatSymbols(*fSymbols);
+    changedFormattingFields |= kFormattingAffixParser;
+}
+
+void
+DecimalFormatImpl::updateFormattingLocalizedPositivePrefix(
+        int32_t &changedFormattingFields, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if ((changedFormattingFields & (
+            kFormattingPosPrefix | kFormattingAffixParserWithCurrency)) == 0) {
+        // No work to do
+        return;
+    }
+    fAffixes.fPositivePrefix.remove();
+    fAffixParser.parse(
+            fPositivePrefixPattern,
+            fCurrencyAffixInfo,
+            fAffixes.fPositivePrefix,
+            status);
+}
+
+void
+DecimalFormatImpl::updateFormattingLocalizedPositiveSuffix(
+        int32_t &changedFormattingFields, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if ((changedFormattingFields & (
+            kFormattingPosSuffix | kFormattingAffixParserWithCurrency)) == 0) {
+        // No work to do
+        return;
+    }
+    fAffixes.fPositiveSuffix.remove();
+    fAffixParser.parse(
+            fPositiveSuffixPattern,
+            fCurrencyAffixInfo,
+            fAffixes.fPositiveSuffix,
+            status);
+}
+
+void
+DecimalFormatImpl::updateFormattingLocalizedNegativePrefix(
+        int32_t &changedFormattingFields, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if ((changedFormattingFields & (
+            kFormattingNegPrefix | kFormattingAffixParserWithCurrency)) == 0) {
+        // No work to do
+        return;
+    }
+    fAffixes.fNegativePrefix.remove();
+    fAffixParser.parse(
+            fNegativePrefixPattern,
+            fCurrencyAffixInfo,
+            fAffixes.fNegativePrefix,
+            status);
+}
+
+void
+DecimalFormatImpl::updateFormattingLocalizedNegativeSuffix(
+        int32_t &changedFormattingFields, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if ((changedFormattingFields & (
+            kFormattingNegSuffix | kFormattingAffixParserWithCurrency)) == 0) {
+        // No work to do
+        return;
+    }
+    fAffixes.fNegativeSuffix.remove();
+    fAffixParser.parse(
+            fNegativeSuffixPattern,
+            fCurrencyAffixInfo,
+            fAffixes.fNegativeSuffix,
+            status);
+}
+
+void
+DecimalFormatImpl::updateForApplyPatternFavorCurrencyPrecision(
+        UErrorCode &status) {
+    updateAll(kFormattingAll & ~kFormattingSymbols, TRUE, status);
+}
+
+void
+DecimalFormatImpl::updateForApplyPattern(UErrorCode &status) {
+    updateAll(kFormattingAll & ~kFormattingSymbols, FALSE, status);
+}
+
+void
+DecimalFormatImpl::updateAll(UErrorCode &status) {
+    updateAll(kFormattingAll, TRUE, status);
+}
+
+void
+DecimalFormatImpl::updateAll(
+        int32_t formattingFlags,
+        UBool updatePrecisionBasedOnCurrency,
+        UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    updatePrecision();
+    updateGrouping();
+    updateFormatting(
+            formattingFlags, updatePrecisionBasedOnCurrency, status);
+    setMultiplierScale(getPatternScale());
+}
+
+
+static int32_t
+getMinimumLengthToDescribeGrouping(const DigitGrouping &grouping) {
+    if (grouping.fGrouping <= 0) {
+        return 0;
+    }
+    if (grouping.fGrouping2 <= 0) {
+        return grouping.fGrouping + 1;
+    }
+    return grouping.fGrouping + grouping.fGrouping2 + 1;
+}
+
+/**
+ * Given a grouping policy, calculates how many digits are needed left of
+ * the decimal point to achieve a desired length left of the
+ * decimal point.
+ * @param grouping the grouping policy
+ * @param desiredLength number of characters needed left of decimal point
+ * @param minLeftDigits at least this many digits is returned
+ * @param leftDigits the number of digits needed stored here
+ *  which is >= minLeftDigits.
+ * @return true if a perfect fit or false if having leftDigits would exceed
+ *   desiredLength
+ */
+static UBool
+getLeftDigitsForLeftLength(
+        const DigitGrouping &grouping,
+        int32_t desiredLength,
+        int32_t minLeftDigits,
+        int32_t &leftDigits) {
+    leftDigits = minLeftDigits;
+    int32_t lengthSoFar = leftDigits + grouping.getSeparatorCount(leftDigits);
+    while (lengthSoFar < desiredLength) {
+        lengthSoFar += grouping.isSeparatorAt(leftDigits + 1, leftDigits) ? 2 : 1;
+        ++leftDigits;
+    }
+    return (lengthSoFar == desiredLength);
+}
+
+int32_t
+DecimalFormatImpl::computeExponentPatternLength() const {
+    if (fUseScientific) {
+        return 1 + (fOptions.fExponent.fAlwaysShowSign ? 1 : 0) + fEffPrecision.fMinExponentDigits;
+    }
+    return 0;
+}
+
+int32_t
+DecimalFormatImpl::countFractionDigitAndDecimalPatternLength(
+        int32_t fracDigitCount) const {
+    if (!fOptions.fMantissa.fAlwaysShowDecimal && fracDigitCount == 0) {
+        return 0;
+    }
+    return fracDigitCount + 1;
+}
+
+UnicodeString&
+DecimalFormatImpl::toNumberPattern(
+        UBool hasPadding, int32_t minimumLength, UnicodeString& result) const {
+    // Get a grouping policy like the one in this object that does not
+    // have minimum grouping since toPattern doesn't support it.
+    DigitGrouping grouping(fEffGrouping);
+    grouping.fMinGrouping = 0;
+
+    // Only for fixed digits, these are the digits that get 0's.
+    DigitInterval minInterval;
+
+    // Only for fixed digits, these are the digits that get #'s.
+    DigitInterval maxInterval;
+
+    // Only for significant digits
+    int32_t sigMin;
+    int32_t sigMax;
+
+    // These are all the digits to be displayed. For significant digits,
+    // this interval always starts at the 1's place an extends left.
+    DigitInterval fullInterval;
+
+    // Digit range of rounding increment. If rounding increment is .025.
+    // then roundingIncrementLowerExp = -3 and roundingIncrementUpperExp = -1
+    int32_t roundingIncrementLowerExp = 0;
+    int32_t roundingIncrementUpperExp = 0;
+
+    if (fUseSigDigits) {
+        SignificantDigitInterval sigInterval;
+        extractSigDigits(sigInterval);
+        sigMax = sigInterval.getMax();
+        sigMin = sigInterval.getMin();
+        fullInterval.setFracDigitCount(0);
+        fullInterval.setIntDigitCount(sigMax);
+    } else {
+        extractMinMaxDigits(minInterval, maxInterval);
+        if (fUseScientific) {
+           if (maxInterval.getIntDigitCount() > kMaxScientificIntegerDigits) {
+               maxInterval.setIntDigitCount(1);
+               minInterval.shrinkToFitWithin(maxInterval);
+           }
+        } else if (hasPadding) {
+            // Make max int digits match min int digits for now, we
+            // compute necessary padding later.
+            maxInterval.setIntDigitCount(minInterval.getIntDigitCount());
+        } else {
+            // For some reason toPattern adds at least one leading '#'
+            maxInterval.setIntDigitCount(minInterval.getIntDigitCount() + 1);
+        }
+        if (!fEffPrecision.fMantissa.fRoundingIncrement.isZero()) {
+            roundingIncrementLowerExp = 
+                    fEffPrecision.fMantissa.fRoundingIncrement.getLowerExponent();
+            roundingIncrementUpperExp = 
+                    fEffPrecision.fMantissa.fRoundingIncrement.getUpperExponent();
+            // We have to include the rounding increment in what we display
+            maxInterval.expandToContainDigit(roundingIncrementLowerExp);
+            maxInterval.expandToContainDigit(roundingIncrementUpperExp - 1);
+        }
+        fullInterval = maxInterval;
+    }
+    // We have to include enough digits to show grouping strategy
+    int32_t minLengthToDescribeGrouping =
+           getMinimumLengthToDescribeGrouping(grouping);
+    if (minLengthToDescribeGrouping > 0) {
+        fullInterval.expandToContainDigit(
+                getMinimumLengthToDescribeGrouping(grouping) - 1);
+    }
+
+    // If we have a minimum length, we have to add digits to the left to
+    // depict padding.
+    if (hasPadding) {
+        // For non scientific notation,
+        //  minimumLengthForMantissa = minimumLength
+        int32_t minimumLengthForMantissa = 
+                minimumLength - computeExponentPatternLength();
+        int32_t mininumLengthForMantissaIntPart =
+                minimumLengthForMantissa
+                - countFractionDigitAndDecimalPatternLength(
+                        fullInterval.getFracDigitCount());
+        // Because of grouping, we may need fewer than expected digits to
+        // achieve the length we need.
+        int32_t digitsNeeded;
+        if (getLeftDigitsForLeftLength(
+                grouping,
+                mininumLengthForMantissaIntPart,
+                fullInterval.getIntDigitCount(),
+                digitsNeeded)) {
+
+            // In this case, we achieved the exact length that we want.
+            fullInterval.setIntDigitCount(digitsNeeded);
+        } else if (digitsNeeded > fullInterval.getIntDigitCount()) {
+
+            // Having digitsNeeded digits goes over desired length which
+            // means that to have desired length would mean starting on a
+            // grouping sepearator e.g ,###,### so add a '#' and use one
+            // less digit. This trick gives ####,### but that is the best
+            // we can do.
+            result.append(kPatternDigit);
+            fullInterval.setIntDigitCount(digitsNeeded - 1);
+        }
+    }
+    int32_t maxDigitPos = fullInterval.getMostSignificantExclusive();
+    int32_t minDigitPos = fullInterval.getLeastSignificantInclusive();
+    for (int32_t i = maxDigitPos - 1; i >= minDigitPos; --i) {
+        if (!fOptions.fMantissa.fAlwaysShowDecimal && i == -1) {
+            result.append(kPatternDecimalSeparator);
+        }
+        if (fUseSigDigits) {
+            // Use digit symbol
+            if (i >= sigMax || i < sigMax - sigMin) {
+                result.append(kPatternDigit);
+            } else {
+                result.append(kPatternSignificantDigit);
+            }
+        } else {
+            if (i < roundingIncrementUpperExp && i >= roundingIncrementLowerExp) {
+                result.append(fEffPrecision.fMantissa.fRoundingIncrement.getDigitByExponent(i) + kPatternZeroDigit);
+            } else if (minInterval.contains(i)) {
+                result.append(kPatternZeroDigit);
+            } else {
+                result.append(kPatternDigit);
+            }
+        }
+        if (grouping.isSeparatorAt(i + 1, i)) {
+            result.append(kPatternGroupingSeparator);
+        }
+        if (fOptions.fMantissa.fAlwaysShowDecimal && i == 0) {
+            result.append(kPatternDecimalSeparator);
+        }
+    }
+    if (fUseScientific) {
+        result.append(kPatternExponent);
+        if (fOptions.fExponent.fAlwaysShowSign) {
+            result.append(kPatternPlus);
+        }
+        for (int32_t i = 0; i < 1 || i < fEffPrecision.fMinExponentDigits; ++i) {
+            result.append(kPatternZeroDigit);
+        }
+    }
+    return result;
+}
+
+UnicodeString&
+DecimalFormatImpl::toPattern(UnicodeString& result) const {
+    result.remove();
+    UnicodeString padSpec;
+    if (fAffixes.fWidth > 0) {
+        padSpec.append(kPatternPadEscape);
+        padSpec.append(fAffixes.fPadChar);
+    }
+    if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadBeforePrefix) {
+        result.append(padSpec);
+    }
+    fPositivePrefixPattern.toUserString(result);
+    if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadAfterPrefix) {
+        result.append(padSpec);
+    }
+    toNumberPattern(
+            fAffixes.fWidth > 0,
+            fAffixes.fWidth - fPositivePrefixPattern.countChar32() - fPositiveSuffixPattern.countChar32(),
+            result);
+    if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadBeforeSuffix) {
+        result.append(padSpec);
+    }
+    fPositiveSuffixPattern.toUserString(result);
+    if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadAfterSuffix) {
+        result.append(padSpec);
+    }
+    AffixPattern withNegative;
+    withNegative.add(AffixPattern::kNegative);
+    withNegative.append(fPositivePrefixPattern);
+    if (!fPositiveSuffixPattern.equals(fNegativeSuffixPattern) ||
+            !withNegative.equals(fNegativePrefixPattern)) {
+        result.append(kPatternSeparator);
+        if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadBeforePrefix) {
+            result.append(padSpec);
+        }
+        fNegativePrefixPattern.toUserString(result);
+        if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadAfterPrefix) {
+            result.append(padSpec);
+        }
+        toNumberPattern(
+                fAffixes.fWidth > 0,
+                fAffixes.fWidth - fNegativePrefixPattern.countChar32() - fNegativeSuffixPattern.countChar32(),
+                result);
+        if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadBeforeSuffix) {
+            result.append(padSpec);
+        }
+        fNegativeSuffixPattern.toUserString(result);
+        if (fAffixes.fPadPosition == DigitAffixesAndPadding::kPadAfterSuffix) {
+            result.append(padSpec);
+        }
+    }
+    return result;
+}
+
+int32_t
+DecimalFormatImpl::getOldFormatWidth() const {
+    if (fAffixes.fWidth == 0) {
+        return 0;
+    }
+    return fAffixes.fWidth - fPositiveSuffixPattern.countChar32() - fPositivePrefixPattern.countChar32();
+}
+
+const UnicodeString &
+DecimalFormatImpl::getConstSymbol(
+        DecimalFormatSymbols::ENumberFormatSymbol symbol) const {
+   return fSymbols->getConstSymbol(symbol); 
+}
+
+UBool
+DecimalFormatImpl::isParseFastpath() const {
+    AffixPattern negative;
+    negative.add(AffixPattern::kNegative);
+
+    return fAffixes.fWidth == 0 &&
+    fPositivePrefixPattern.countChar32() == 0 &&
+    fNegativePrefixPattern.equals(negative) &&
+    fPositiveSuffixPattern.countChar32() == 0 &&
+    fNegativeSuffixPattern.countChar32() == 0;
+}
+
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+