Update ICU to 54.1 step 1

source/i18n/decimalformatpattern.cpp

+/*
+*******************************************************************************
+* Copyright (C) 1997-2014, International Business Machines Corporation and    *
+* others. All Rights Reserved.                                                *
+*******************************************************************************
+*/
+
+#include "uassert.h"
+#include "decimalformatpattern.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/dcfmtsym.h"
+#include "unicode/format.h"
+#include "unicode/utf16.h"
+
+#ifdef FMT_DEBUG
+#define debug(x) printf("%s:%d: %s\n", __FILE__,__LINE__, x);
+#else
+#define debug(x)
+#endif
+
+#define kPatternZeroDigit            ((UChar)0x0030) /*'0'*/
+#define kPatternSignificantDigit     ((UChar)0x0040) /*'@'*/
+#define kPatternGroupingSeparator    ((UChar)0x002C) /*','*/
+#define kPatternDecimalSeparator     ((UChar)0x002E) /*'.'*/
+#define kPatternPerMill              ((UChar)0x2030)
+#define kPatternPercent              ((UChar)0x0025) /*'%'*/
+#define kPatternDigit                ((UChar)0x0023) /*'#'*/
+#define kPatternSeparator            ((UChar)0x003B) /*';'*/
+#define kPatternExponent             ((UChar)0x0045) /*'E'*/
+#define kPatternPlus                 ((UChar)0x002B) /*'+'*/
+#define kPatternMinus                ((UChar)0x002D) /*'-'*/
+#define kPatternPadEscape            ((UChar)0x002A) /*'*'*/
+#define kQuote                       ((UChar)0x0027) /*'\''*/
+
+#define kCurrencySign                ((UChar)0x00A4)
+#define kDefaultPad                  ((UChar)0x0020) /* */
+
+U_NAMESPACE_BEGIN
+
+// TODO: Travis Keep: Copied from numfmt.cpp
+static int32_t kDoubleIntegerDigits  = 309;
+static int32_t kDoubleFractionDigits = 340;
+
+
+// TODO: Travis Keep: Copied from numfmt.cpp
+static int32_t gDefaultMaxIntegerDigits = 2000000000;
+
+// TODO: Travis Keep: This function was copied from format.cpp
+static void syntaxError(const UnicodeString& pattern,
+                         int32_t pos,
+                         UParseError& parseError) {
+    parseError.offset = pos;
+    parseError.line=0;  // we are not using line number
+
+    // for pre-context
+    int32_t start = (pos < U_PARSE_CONTEXT_LEN)? 0 : (pos - (U_PARSE_CONTEXT_LEN-1
+                                                             /* subtract 1 so that we have room for null*/));
+    int32_t stop  = pos;
+    pattern.extract(start,stop-start,parseError.preContext,0);
+    //null terminate the buffer
+    parseError.preContext[stop-start] = 0;
+
+    //for post-context
+    start = pos+1;
+    stop  = ((pos+U_PARSE_CONTEXT_LEN)<=pattern.length()) ? (pos+(U_PARSE_CONTEXT_LEN-1)) :
+        pattern.length();
+    pattern.extract(start,stop-start,parseError.postContext,0);
+    //null terminate the buffer
+    parseError.postContext[stop-start]= 0;
+}
+
+DecimalFormatPattern::DecimalFormatPattern()
+        : fMinimumIntegerDigits(1),
+          fMaximumIntegerDigits(gDefaultMaxIntegerDigits),
+          fMinimumFractionDigits(0),
+          fMaximumFractionDigits(3),
+          fUseSignificantDigits(FALSE),
+          fMinimumSignificantDigits(1),
+          fMaximumSignificantDigits(6),
+          fUseExponentialNotation(FALSE),
+          fMinExponentDigits(0),
+          fExponentSignAlwaysShown(FALSE),
+          fCurrencySignCount(fgCurrencySignCountZero),
+          fGroupingUsed(TRUE),
+          fGroupingSize(0),
+          fGroupingSize2(0),
+          fMultiplier(1),
+          fDecimalSeparatorAlwaysShown(FALSE),
+          fFormatWidth(0),
+          fRoundingIncrementUsed(FALSE),
+          fRoundingIncrement(),
+          fPad(kPatternPadEscape),
+          fNegPatternsBogus(TRUE),
+          fPosPatternsBogus(TRUE),
+          fNegPrefixPattern(),
+          fNegSuffixPattern(),
+          fPosPrefixPattern(),
+          fPosSuffixPattern(),
+          fPadPosition(DecimalFormatPattern::kPadBeforePrefix) {
+}
+
+
+DecimalFormatPatternParser::DecimalFormatPatternParser() :
+    fZeroDigit(kPatternZeroDigit),
+    fSigDigit(kPatternSignificantDigit),
+    fGroupingSeparator((UChar)kPatternGroupingSeparator),
+    fDecimalSeparator((UChar)kPatternDecimalSeparator),
+    fPercent((UChar)kPatternPercent),
+    fPerMill((UChar)kPatternPerMill),
+    fDigit((UChar)kPatternDigit),
+    fSeparator((UChar)kPatternSeparator),
+    fExponent((UChar)kPatternExponent),
+    fPlus((UChar)kPatternPlus),
+    fMinus((UChar)kPatternMinus),
+    fPadEscape((UChar)kPatternPadEscape) {
+}
+
+void DecimalFormatPatternParser::useSymbols(
+        const DecimalFormatSymbols& symbols) {
+    fZeroDigit = symbols.getConstSymbol(
+            DecimalFormatSymbols::kZeroDigitSymbol).char32At(0);
+    fSigDigit = symbols.getConstSymbol(
+            DecimalFormatSymbols::kSignificantDigitSymbol).char32At(0);
+    fGroupingSeparator = symbols.getConstSymbol(
+            DecimalFormatSymbols::kGroupingSeparatorSymbol);
+    fDecimalSeparator = symbols.getConstSymbol(
+            DecimalFormatSymbols::kDecimalSeparatorSymbol);
+    fPercent = symbols.getConstSymbol(
+            DecimalFormatSymbols::kPercentSymbol);
+    fPerMill = symbols.getConstSymbol(
+            DecimalFormatSymbols::kPerMillSymbol);
+    fDigit = symbols.getConstSymbol(
+            DecimalFormatSymbols::kDigitSymbol);
+    fSeparator = symbols.getConstSymbol(
+            DecimalFormatSymbols::kPatternSeparatorSymbol);
+    fExponent = symbols.getConstSymbol(
+            DecimalFormatSymbols::kExponentialSymbol);
+    fPlus = symbols.getConstSymbol(
+            DecimalFormatSymbols::kPlusSignSymbol);
+    fMinus = symbols.getConstSymbol(
+            DecimalFormatSymbols::kMinusSignSymbol);
+    fPadEscape = symbols.getConstSymbol(
+            DecimalFormatSymbols::kPadEscapeSymbol);
+}
+
+void
+DecimalFormatPatternParser::applyPatternWithoutExpandAffix(
+        const UnicodeString& pattern,
+        DecimalFormatPattern& out,
+        UParseError& parseError,
+        UErrorCode& status) {
+    if (U_FAILURE(status))
+    {
+        return;
+    }
+    out = DecimalFormatPattern();
+
+    // Clear error struct
+    parseError.offset = -1;
+    parseError.preContext[0] = parseError.postContext[0] = (UChar)0;
+
+    // TODO: Travis Keep: This won't always work.
+    UChar nineDigit = (UChar)(fZeroDigit + 9);
+    int32_t digitLen = fDigit.length();
+    int32_t groupSepLen = fGroupingSeparator.length();
+    int32_t decimalSepLen = fDecimalSeparator.length();
+
+    int32_t pos = 0;
+    int32_t patLen = pattern.length();
+    // Part 0 is the positive pattern.  Part 1, if present, is the negative
+    // pattern.
+    for (int32_t part=0; part<2 && pos<patLen; ++part) {
+        // The subpart ranges from 0 to 4: 0=pattern proper, 1=prefix,
+        // 2=suffix, 3=prefix in quote, 4=suffix in quote.  Subpart 0 is
+        // between the prefix and suffix, and consists of pattern
+        // characters.  In the prefix and suffix, percent, perMill, and
+        // currency symbols are recognized and translated.
+        int32_t subpart = 1, sub0Start = 0, sub0Limit = 0, sub2Limit = 0;
+
+        // It's important that we don't change any fields of this object
+        // prematurely.  We set the following variables for the multiplier,
+        // grouping, etc., and then only change the actual object fields if
+        // everything parses correctly.  This also lets us register
+        // the data from part 0 and ignore the part 1, except for the
+        // prefix and suffix.
+        UnicodeString prefix;
+        UnicodeString suffix;
+        int32_t decimalPos = -1;
+        int32_t multiplier = 1;
+        int32_t digitLeftCount = 0, zeroDigitCount = 0, digitRightCount = 0, sigDigitCount = 0;
+        int8_t groupingCount = -1;
+        int8_t groupingCount2 = -1;
+        int32_t padPos = -1;
+        UChar32 padChar = 0;
+        int32_t roundingPos = -1;
+        DigitList roundingInc;
+        int8_t expDigits = -1;
+        UBool expSignAlways = FALSE;
+
+        // The affix is either the prefix or the suffix.
+        UnicodeString* affix = &prefix;
+
+        int32_t start = pos;
+        UBool isPartDone = FALSE;
+        UChar32 ch;
+
+        for (; !isPartDone && pos < patLen; ) {
+            // Todo: account for surrogate pairs
+            ch = pattern.char32At(pos);
+            switch (subpart) {
+            case 0: // Pattern proper subpart (between prefix & suffix)
+                // Process the digits, decimal, and grouping characters.  We
+                // record five pieces of information.  We expect the digits
+                // to occur in the pattern ####00.00####, and we record the
+                // number of left digits, zero (central) digits, and right
+                // digits.  The position of the last grouping character is
+                // recorded (should be somewhere within the first two blocks
+                // of characters), as is the position of the decimal point,
+                // if any (should be in the zero digits).  If there is no
+                // decimal point, then there should be no right digits.
+                if (pattern.compare(pos, digitLen, fDigit) == 0) {
+                    if (zeroDigitCount > 0 || sigDigitCount > 0) {
+                        ++digitRightCount;
+                    } else {
+                        ++digitLeftCount;
+                    }
+                    if (groupingCount >= 0 && decimalPos < 0) {
+                        ++groupingCount;
+                    }
+                    pos += digitLen;
+                } else if ((ch >= fZeroDigit && ch <= nineDigit) ||
+                           ch == fSigDigit) {
+                    if (digitRightCount > 0) {
+                        // Unexpected '0'
+                        debug("Unexpected '0'")
+                        status = U_UNEXPECTED_TOKEN;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                    if (ch == fSigDigit) {
+                        ++sigDigitCount;
+                    } else {
+                        if (ch != fZeroDigit && roundingPos < 0) {
+                            roundingPos = digitLeftCount + zeroDigitCount;
+                        }
+                        if (roundingPos >= 0) {
+                            roundingInc.append((char)(ch - fZeroDigit + '0'));
+                        }
+                        ++zeroDigitCount;
+                    }
+                    if (groupingCount >= 0 && decimalPos < 0) {
+                        ++groupingCount;
+                    }
+                    pos += U16_LENGTH(ch);
+                } else if (pattern.compare(pos, groupSepLen, fGroupingSeparator) == 0) {
+                    if (decimalPos >= 0) {
+                        // Grouping separator after decimal
+                        debug("Grouping separator after decimal")
+                        status = U_UNEXPECTED_TOKEN;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                    groupingCount2 = groupingCount;
+                    groupingCount = 0;
+                    pos += groupSepLen;
+                } else if (pattern.compare(pos, decimalSepLen, fDecimalSeparator) == 0) {
+                    if (decimalPos >= 0) {
+                        // Multiple decimal separators
+                        debug("Multiple decimal separators")
+                        status = U_MULTIPLE_DECIMAL_SEPARATORS;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                    // Intentionally incorporate the digitRightCount,
+                    // even though it is illegal for this to be > 0
+                    // at this point.  We check pattern syntax below.
+                    decimalPos = digitLeftCount + zeroDigitCount + digitRightCount;
+                    pos += decimalSepLen;
+                } else {
+                    if (pattern.compare(pos, fExponent.length(), fExponent) == 0) {
+                        if (expDigits >= 0) {
+                            // Multiple exponential symbols
+                            debug("Multiple exponential symbols")
+                            status = U_MULTIPLE_EXPONENTIAL_SYMBOLS;
+                            syntaxError(pattern,pos,parseError);
+                            return;
+                        }
+                        if (groupingCount >= 0) {
+                            // Grouping separator in exponential pattern
+                            debug("Grouping separator in exponential pattern")
+                            status = U_MALFORMED_EXPONENTIAL_PATTERN;
+                            syntaxError(pattern,pos,parseError);
+                            return;
+                        }
+                        pos += fExponent.length();
+                        // Check for positive prefix
+                        if (pos < patLen
+                            && pattern.compare(pos, fPlus.length(), fPlus) == 0) {
+                            expSignAlways = TRUE;
+                            pos += fPlus.length();
+                        }
+                        // Use lookahead to parse out the exponential part of the
+                        // pattern, then jump into suffix subpart.
+                        expDigits = 0;
+                        while (pos < patLen &&
+                               pattern.char32At(pos) == fZeroDigit) {
+                            ++expDigits;
+                            pos += U16_LENGTH(fZeroDigit);
+                        }
+
+                        // 1. Require at least one mantissa pattern digit
+                        // 2. Disallow "#+ @" in mantissa
+                        // 3. Require at least one exponent pattern digit
+                        if (((digitLeftCount + zeroDigitCount) < 1 &&
+                             (sigDigitCount + digitRightCount) < 1) ||
+                            (sigDigitCount > 0 && digitLeftCount > 0) ||
+                            expDigits < 1) {
+                            // Malformed exponential pattern
+                            debug("Malformed exponential pattern")
+                            status = U_MALFORMED_EXPONENTIAL_PATTERN;
+                            syntaxError(pattern,pos,parseError);
+                            return;
+                        }
+                    }
+                    // Transition to suffix subpart
+                    subpart = 2; // suffix subpart
+                    affix = &suffix;
+                    sub0Limit = pos;
+                    continue;
+                }
+                break;
+            case 1: // Prefix subpart
+            case 2: // Suffix subpart
+                // Process the prefix / suffix characters
+                // Process unquoted characters seen in prefix or suffix
+                // subpart.
+
+                // Several syntax characters implicitly begins the
+                // next subpart if we are in the prefix; otherwise
+                // they are illegal if unquoted.
+                if (!pattern.compare(pos, digitLen, fDigit) ||
+                    !pattern.compare(pos, groupSepLen, fGroupingSeparator) ||
+                    !pattern.compare(pos, decimalSepLen, fDecimalSeparator) ||
+                    (ch >= fZeroDigit && ch <= nineDigit) ||
+                    ch == fSigDigit) {
+                    if (subpart == 1) { // prefix subpart
+                        subpart = 0; // pattern proper subpart
+                        sub0Start = pos; // Reprocess this character
+                        continue;
+                    } else {
+                        status = U_UNQUOTED_SPECIAL;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                } else if (ch == kCurrencySign) {
+                    affix->append(kQuote); // Encode currency
+                    // Use lookahead to determine if the currency sign is
+                    // doubled or not.
+                    U_ASSERT(U16_LENGTH(kCurrencySign) == 1);
+                    if ((pos+1) < pattern.length() && pattern[pos+1] == kCurrencySign) {
+                        affix->append(kCurrencySign);
+                        ++pos; // Skip over the doubled character
+                        if ((pos+1) < pattern.length() &&
+                            pattern[pos+1] == kCurrencySign) {
+                            affix->append(kCurrencySign);
+                            ++pos; // Skip over the doubled character
+                            out.fCurrencySignCount = fgCurrencySignCountInPluralFormat;
+                        } else {
+                            out.fCurrencySignCount = fgCurrencySignCountInISOFormat;
+                        }
+                    } else {
+                        out.fCurrencySignCount = fgCurrencySignCountInSymbolFormat;
+                    }
+                    // Fall through to append(ch)
+                } else if (ch == kQuote) {
+                    // A quote outside quotes indicates either the opening
+                    // quote or two quotes, which is a quote literal.  That is,
+                    // we have the first quote in 'do' or o''clock.
+                    U_ASSERT(U16_LENGTH(kQuote) == 1);
+                    ++pos;
+                    if (pos < pattern.length() && pattern[pos] == kQuote) {
+                        affix->append(kQuote); // Encode quote
+                        // Fall through to append(ch)
+                    } else {
+                        subpart += 2; // open quote
+                        continue;
+                    }
+                } else if (pattern.compare(pos, fSeparator.length(), fSeparator) == 0) {
+                    // Don't allow separators in the prefix, and don't allow
+                    // separators in the second pattern (part == 1).
+                    if (subpart == 1 || part == 1) {
+                        // Unexpected separator
+                        debug("Unexpected separator")
+                        status = U_UNEXPECTED_TOKEN;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                    sub2Limit = pos;
+                    isPartDone = TRUE; // Go to next part
+                    pos += fSeparator.length();
+                    break;
+                } else if (pattern.compare(pos, fPercent.length(), fPercent) == 0) {
+                    // Next handle characters which are appended directly.
+                    if (multiplier != 1) {
+                        // Too many percent/perMill characters
+                        debug("Too many percent characters")
+                        status = U_MULTIPLE_PERCENT_SYMBOLS;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                    affix->append(kQuote); // Encode percent/perMill
+                    affix->append(kPatternPercent); // Use unlocalized pattern char
+                    multiplier = 100;
+                    pos += fPercent.length();
+                    break;
+                } else if (pattern.compare(pos, fPerMill.length(), fPerMill) == 0) {
+                    // Next handle characters which are appended directly.
+                    if (multiplier != 1) {
+                        // Too many percent/perMill characters
+                        debug("Too many perMill characters")
+                        status = U_MULTIPLE_PERMILL_SYMBOLS;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                    affix->append(kQuote); // Encode percent/perMill
+                    affix->append(kPatternPerMill); // Use unlocalized pattern char
+                    multiplier = 1000;
+                    pos += fPerMill.length();
+                    break;
+                } else if (pattern.compare(pos, fPadEscape.length(), fPadEscape) == 0) {
+                    if (padPos >= 0 ||               // Multiple pad specifiers
+                        (pos+1) == pattern.length()) { // Nothing after padEscape
+                        debug("Multiple pad specifiers")
+                        status = U_MULTIPLE_PAD_SPECIFIERS;
+                        syntaxError(pattern,pos,parseError);
+                        return;
+                    }
+                    padPos = pos;
+                    pos += fPadEscape.length();
+                    padChar = pattern.char32At(pos);
+                    pos += U16_LENGTH(padChar);
+                    break;
+                } else if (pattern.compare(pos, fMinus.length(), fMinus) == 0) {
+                    affix->append(kQuote); // Encode minus
+                    affix->append(kPatternMinus);
+                    pos += fMinus.length();
+                    break;
+                } else if (pattern.compare(pos, fPlus.length(), fPlus) == 0) {
+                    affix->append(kQuote); // Encode plus
+                    affix->append(kPatternPlus);
+                    pos += fPlus.length();
+                    break;
+                }
+                // Unquoted, non-special characters fall through to here, as
+                // well as other code which needs to append something to the
+                // affix.
+                affix->append(ch);
+                pos += U16_LENGTH(ch);
+                break;
+            case 3: // Prefix subpart, in quote
+            case 4: // Suffix subpart, in quote
+                // A quote within quotes indicates either the closing
+                // quote or two quotes, which is a quote literal.  That is,
+                // we have the second quote in 'do' or 'don''t'.
+                if (ch == kQuote) {
+                    ++pos;
+                    if (pos < pattern.length() && pattern[pos] == kQuote) {
+                        affix->append(kQuote); // Encode quote
+                        // Fall through to append(ch)
+                    } else {
+                        subpart -= 2; // close quote
+                        continue;
+                    }
+                }
+                affix->append(ch);
+                pos += U16_LENGTH(ch);
+                break;
+            }
+        }
+
+        if (sub0Limit == 0) {
+            sub0Limit = pattern.length();
+        }
+
+        if (sub2Limit == 0) {
+            sub2Limit = pattern.length();
+        }
+
+        /* Handle patterns with no '0' pattern character.  These patterns
+         * are legal, but must be recodified to make sense.  "##.###" ->
+         * "#0.###".  ".###" -> ".0##".
+         *
+         * We allow patterns of the form "####" to produce a zeroDigitCount
+         * of zero (got that?); although this seems like it might make it
+         * possible for format() to produce empty strings, format() checks
+         * for this condition and outputs a zero digit in this situation.
+         * Having a zeroDigitCount of zero yields a minimum integer digits
+         * of zero, which allows proper round-trip patterns.  We don't want
+         * "#" to become "#0" when toPattern() is called (even though that's
+         * what it really is, semantically).
+         */
+        if (zeroDigitCount == 0 && sigDigitCount == 0 &&
+            digitLeftCount > 0 && decimalPos >= 0) {
+            // Handle "###.###" and "###." and ".###"
+            int n = decimalPos;
+            if (n == 0)
+                ++n; // Handle ".###"
+            digitRightCount = digitLeftCount - n;
+            digitLeftCount = n - 1;
+            zeroDigitCount = 1;
+        }
+
+        // Do syntax checking on the digits, decimal points, and quotes.
+        if ((decimalPos < 0 && digitRightCount > 0 && sigDigitCount == 0) ||
+            (decimalPos >= 0 &&
+             (sigDigitCount > 0 ||
+              decimalPos < digitLeftCount ||
+              decimalPos > (digitLeftCount + zeroDigitCount))) ||
+            groupingCount == 0 || groupingCount2 == 0 ||
+            (sigDigitCount > 0 && zeroDigitCount > 0) ||
+            subpart > 2)
+        { // subpart > 2 == unmatched quote
+            debug("Syntax error")
+            status = U_PATTERN_SYNTAX_ERROR;
+            syntaxError(pattern,pos,parseError);
+            return;
+        }
+
+        // Make sure pad is at legal position before or after affix.
+        if (padPos >= 0) {
+            if (padPos == start) {
+                padPos = DecimalFormatPattern::kPadBeforePrefix;
+            } else if (padPos+2 == sub0Start) {
+                padPos = DecimalFormatPattern::kPadAfterPrefix;
+            } else if (padPos == sub0Limit) {
+                padPos = DecimalFormatPattern::kPadBeforeSuffix;
+            } else if (padPos+2 == sub2Limit) {
+                padPos = DecimalFormatPattern::kPadAfterSuffix;
+            } else {
+                // Illegal pad position
+                debug("Illegal pad position")
+                status = U_ILLEGAL_PAD_POSITION;
+                syntaxError(pattern,pos,parseError);
+                return;
+            }
+        }
+
+        if (part == 0) {
+            out.fPosPatternsBogus = FALSE;
+            out.fPosPrefixPattern = prefix;
+            out.fPosSuffixPattern = suffix;
+            out.fNegPatternsBogus = TRUE;
+            out.fNegPrefixPattern.remove();
+            out.fNegSuffixPattern.remove();
+
+            out.fUseExponentialNotation = (expDigits >= 0);
+            if (out.fUseExponentialNotation) {
+              out.fMinExponentDigits = expDigits;
+            }
+            out.fExponentSignAlwaysShown = expSignAlways;
+            int32_t digitTotalCount = digitLeftCount + zeroDigitCount + digitRightCount;
+            // The effectiveDecimalPos is the position the decimal is at or
+            // would be at if there is no decimal.  Note that if
+            // decimalPos<0, then digitTotalCount == digitLeftCount +
+            // zeroDigitCount.
+            int32_t effectiveDecimalPos = decimalPos >= 0 ? decimalPos : digitTotalCount;
+            UBool isSigDig = (sigDigitCount > 0);
+            out.fUseSignificantDigits = isSigDig;
+            if (isSigDig) {
+                out.fMinimumSignificantDigits = sigDigitCount;
+                out.fMaximumSignificantDigits = sigDigitCount + digitRightCount;
+            } else {
+                int32_t minInt = effectiveDecimalPos - digitLeftCount;
+                out.fMinimumIntegerDigits = minInt;
+                out.fMaximumIntegerDigits = out.fUseExponentialNotation
+                    ? digitLeftCount + out.fMinimumIntegerDigits
+                    : gDefaultMaxIntegerDigits;
+                out.fMaximumFractionDigits = decimalPos >= 0
+                    ? (digitTotalCount - decimalPos) : 0;
+                out.fMinimumFractionDigits = decimalPos >= 0
+                    ? (digitLeftCount + zeroDigitCount - decimalPos) : 0;
+            }
+            out.fGroupingUsed = groupingCount > 0;
+            out.fGroupingSize = (groupingCount > 0) ? groupingCount : 0;
+            out.fGroupingSize2 = (groupingCount2 > 0 && groupingCount2 != groupingCount)
+                ? groupingCount2 : 0;
+            out.fMultiplier = multiplier;
+            out.fDecimalSeparatorAlwaysShown = decimalPos == 0
+                    || decimalPos == digitTotalCount;
+            if (padPos >= 0) {
+                out.fPadPosition = (DecimalFormatPattern::EPadPosition) padPos;
+                // To compute the format width, first set up sub0Limit -
+                // sub0Start.  Add in prefix/suffix length later.
+
+                // fFormatWidth = prefix.length() + suffix.length() +
+                //    sub0Limit - sub0Start;
+                out.fFormatWidth = sub0Limit - sub0Start;
+                out.fPad = padChar;
+            } else {
+                out.fFormatWidth = 0;
+            }
+            if (roundingPos >= 0) {
+                out.fRoundingIncrementUsed = TRUE;
+                roundingInc.setDecimalAt(effectiveDecimalPos - roundingPos);
+                out.fRoundingIncrement = roundingInc;
+            } else {
+                out.fRoundingIncrementUsed = FALSE;
+            }
+        } else {
+            out.fNegPatternsBogus = FALSE;
+            out.fNegPrefixPattern = prefix;
+            out.fNegSuffixPattern = suffix;
+        }
+    }
+
+    if (pattern.length() == 0) {
+        out.fNegPatternsBogus = TRUE;
+        out.fNegPrefixPattern.remove();
+        out.fNegSuffixPattern.remove();
+        out.fPosPatternsBogus = FALSE;
+        out.fPosPrefixPattern.remove();
+        out.fPosSuffixPattern.remove();
+
+        out.fMinimumIntegerDigits = 0;
+        out.fMaximumIntegerDigits = kDoubleIntegerDigits;
+        out.fMinimumFractionDigits = 0;
+        out.fMaximumFractionDigits = kDoubleFractionDigits;
+
+        out.fUseExponentialNotation = FALSE;
+        out.fCurrencySignCount = fgCurrencySignCountZero;
+        out.fGroupingUsed = FALSE;
+        out.fGroupingSize = 0;
+        out.fGroupingSize2 = 0;
+        out.fMultiplier = 1;
+        out.fDecimalSeparatorAlwaysShown = FALSE;
+        out.fFormatWidth = 0;
+        out.fRoundingIncrementUsed = FALSE;
+    }
+
+    // If there was no negative pattern, or if the negative pattern is
+    // identical to the positive pattern, then prepend the minus sign to the
+    // positive pattern to form the negative pattern.
+    if (out.fNegPatternsBogus ||
+        (out.fNegPrefixPattern == out.fPosPrefixPattern
+         && out.fNegSuffixPattern == out.fPosSuffixPattern)) {
+        out.fNegPatternsBogus = FALSE;
+        out.fNegSuffixPattern = out.fPosSuffixPattern;
+        out.fNegPrefixPattern.remove();
+        out.fNegPrefixPattern.append(kQuote).append(kPatternMinus)
+            .append(out.fPosPrefixPattern);
+    }
+}
+
+U_NAMESPACE_END
+
+#endif /* !UCONFIG_NO_FORMATTING */