/*
*******************************************************************************
* Copyright (C) 1997-2006, International Business Machines Corporation and    *
* others. All Rights Reserved.                                                *
*******************************************************************************
*
* File SMPDTFMT.CPP
*
* Modification History:
*
*   Date        Name        Description
*   02/19/97    aliu        Converted from java.
*   03/31/97    aliu        Modified extensively to work with 50 locales.
*   04/01/97    aliu        Added support for centuries.
*   07/09/97    helena      Made ParsePosition into a class.
*   07/21/98    stephen     Added initializeDefaultCentury.
*                             Removed getZoneIndex (added in DateFormatSymbols)
*                             Removed subParseLong
*                             Removed chk
*  02/22/99     stephen     Removed character literals for EBCDIC safety
*   10/14/99    aliu        Updated 2-digit year parsing so that only "00" thru
*                           "99" are recognized. {j28 4182066}
*   11/15/99    weiv        Added support for week of year/day of week format
********************************************************************************
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/smpdtfmt.h"
#include "unicode/dtfmtsym.h"
#include "unicode/ures.h"
#include "unicode/msgfmt.h"
#include "unicode/calendar.h"
#include "unicode/gregocal.h"
#include "unicode/timezone.h"
#include "unicode/decimfmt.h"
#include "unicode/dcfmtsym.h"
#include "unicode/uchar.h"
#include "unicode/ustring.h"
#include "util.h"
#include "gregoimp.h" 
#include "cstring.h"
#include "uassert.h"
#include <float.h>

#if defined( U_DEBUG_CALSVC ) || defined (U_DEBUG_CAL)
#include <stdio.h>
#endif

// *****************************************************************************
// class SimpleDateFormat
// *****************************************************************************

U_NAMESPACE_BEGIN

/**
 * Last-resort string to use for "GMT" when constructing time zone strings.
 */
// For time zones that have no names, use strings GMT+minutes and
// GMT-minutes. For instance, in France the time zone is GMT+60.
// Also accepted are GMT+H:MM or GMT-H:MM.
static const UChar gGmt[]      = {0x0047, 0x004D, 0x0054, 0x0000};         // "GMT"
static const UChar gGmtPlus[]  = {0x0047, 0x004D, 0x0054, 0x002B, 0x0000}; // "GMT+"
static const UChar gGmtMinus[] = {0x0047, 0x004D, 0x0054, 0x002D, 0x0000}; // "GMT-"

// This is a pattern-of-last-resort used when we can't load a usable pattern out
// of a resource.
static const UChar gDefaultPattern[] =
{
    0x79, 0x79, 0x79, 0x79, 0x4D, 0x4D, 0x64, 0x64, 0x20, 0x68, 0x68, 0x3A, 0x6D, 0x6D, 0x20, 0x61, 0
};  /* "yyyyMMdd hh:mm a" */

// This prefix is designed to NEVER MATCH real text, in order to
// suppress the parsing of negative numbers.  Adjust as needed (if
// this becomes valid Unicode).
static const UChar SUPPRESS_NEGATIVE_PREFIX[] = {0xAB00, 0};

/**
 * These are the tags we expect to see in normal resource bundle files associated
 * with a locale.
 */
static const char gDateTimePatternsTag[]="DateTimePatterns";

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(SimpleDateFormat)

static const UChar QUOTE = 0x27; // Single quote

//----------------------------------------------------------------------

SimpleDateFormat::~SimpleDateFormat()
{
    delete fSymbols;
    delete parsedTimeZone; // sanity check
}

//----------------------------------------------------------------------

SimpleDateFormat::SimpleDateFormat(UErrorCode& status)
  :   fLocale(Locale::getDefault()),
      fSymbols(NULL),
      parsedTimeZone(NULL)
{
    construct(kShort, (EStyle) (kShort + kDateOffset), fLocale, status);
    initializeDefaultCentury();
}

//----------------------------------------------------------------------

SimpleDateFormat::SimpleDateFormat(const UnicodeString& pattern,
                                   UErrorCode &status)
:   fPattern(pattern),
    fLocale(Locale::getDefault()),
    fSymbols(NULL),
    parsedTimeZone(NULL)
{
    initializeSymbols(fLocale, initializeCalendar(NULL,fLocale,status), status);
    initialize(fLocale, status);
    initializeDefaultCentury();
}

//----------------------------------------------------------------------

SimpleDateFormat::SimpleDateFormat(const UnicodeString& pattern,
                                   const Locale& locale,
                                   UErrorCode& status)
:   fPattern(pattern),
    fLocale(locale),
    parsedTimeZone(NULL)
{
    initializeSymbols(fLocale, initializeCalendar(NULL,fLocale,status), status);
    initialize(fLocale, status);
    initializeDefaultCentury();
}

//----------------------------------------------------------------------

SimpleDateFormat::SimpleDateFormat(const UnicodeString& pattern,
                                   DateFormatSymbols* symbolsToAdopt,
                                   UErrorCode& status)
:   fPattern(pattern),
    fLocale(Locale::getDefault()),
    fSymbols(symbolsToAdopt),
    parsedTimeZone(NULL)
{
    initializeCalendar(NULL,fLocale,status);
    initialize(fLocale, status);
    initializeDefaultCentury();
}

//----------------------------------------------------------------------

SimpleDateFormat::SimpleDateFormat(const UnicodeString& pattern,
                                   const DateFormatSymbols& symbols,
                                   UErrorCode& status)
:   fPattern(pattern),
    fLocale(Locale::getDefault()),
    fSymbols(new DateFormatSymbols(symbols)),
    parsedTimeZone(NULL)
{
    initializeCalendar(NULL, fLocale, status);
    initialize(fLocale, status);
    initializeDefaultCentury();
}

//----------------------------------------------------------------------

// Not for public consumption; used by DateFormat
SimpleDateFormat::SimpleDateFormat(EStyle timeStyle,
                                   EStyle dateStyle,
                                   const Locale& locale,
                                   UErrorCode& status)
:   fLocale(locale),
    fSymbols(NULL),
    parsedTimeZone(NULL)
{
    construct(timeStyle, dateStyle, fLocale, status);
    if(U_SUCCESS(status)) {
      initializeDefaultCentury();
    }
}

//----------------------------------------------------------------------

/**
 * Not for public consumption; used by DateFormat.  This constructor
 * never fails.  If the resource data is not available, it uses the
 * the last resort symbols.
 */
SimpleDateFormat::SimpleDateFormat(const Locale& locale,
                                   UErrorCode& status)
:   fPattern(gDefaultPattern),
    fLocale(locale),
    fSymbols(NULL),
    parsedTimeZone(NULL)
{
    if (U_FAILURE(status)) return;
    initializeSymbols(fLocale, initializeCalendar(NULL, fLocale, status),status);
    if (U_FAILURE(status))
    {
        status = U_ZERO_ERROR;
        delete fSymbols;
        // This constructor doesn't fail; it uses last resort data
        fSymbols = new DateFormatSymbols(status);
        /* test for NULL */
        if (fSymbols == 0) {
            status = U_MEMORY_ALLOCATION_ERROR;
            return;
        }
    }

    initialize(fLocale, status);
    if(U_SUCCESS(status)) {
      initializeDefaultCentury();
    }
}

//----------------------------------------------------------------------

SimpleDateFormat::SimpleDateFormat(const SimpleDateFormat& other)
:   DateFormat(other),
    fSymbols(NULL),
    parsedTimeZone(NULL)
{
    *this = other;
}

//----------------------------------------------------------------------

SimpleDateFormat& SimpleDateFormat::operator=(const SimpleDateFormat& other)
{
    DateFormat::operator=(other);

    delete fSymbols;
    fSymbols = NULL;

    delete parsedTimeZone; parsedTimeZone = NULL;

    if (other.fSymbols)
        fSymbols = new DateFormatSymbols(*other.fSymbols);

    fDefaultCenturyStart         = other.fDefaultCenturyStart;
    fDefaultCenturyStartYear     = other.fDefaultCenturyStartYear;
    fHaveDefaultCentury          = other.fHaveDefaultCentury;

    fPattern = other.fPattern;

    return *this;
}

//----------------------------------------------------------------------

Format*
SimpleDateFormat::clone() const
{
    return new SimpleDateFormat(*this);
}

//----------------------------------------------------------------------

UBool
SimpleDateFormat::operator==(const Format& other) const
{
    if (DateFormat::operator==(other)) {
        // DateFormat::operator== guarantees following cast is safe
        SimpleDateFormat* that = (SimpleDateFormat*)&other;
        return (fPattern             == that->fPattern &&
                fSymbols             != NULL && // Check for pathological object
                that->fSymbols       != NULL && // Check for pathological object
                *fSymbols            == *that->fSymbols &&
                fHaveDefaultCentury  == that->fHaveDefaultCentury &&
                fDefaultCenturyStart == that->fDefaultCenturyStart);
    }
    return FALSE;
}

//----------------------------------------------------------------------

void SimpleDateFormat::construct(EStyle timeStyle,
                                 EStyle dateStyle,
                                 const Locale& locale,
                                 UErrorCode& status)
{
    // called by several constructors to load pattern data from the resources
    if (U_FAILURE(status)) return;

    // We will need the calendar to know what type of symbols to load.
    initializeCalendar(NULL, locale, status);
    if (U_FAILURE(status)) return;

    CalendarData calData(locale, fCalendar?fCalendar->getType():NULL, status);
    UResourceBundle *dateTimePatterns = calData.getByKey(gDateTimePatternsTag, status);
    if (U_FAILURE(status)) return;

    if (ures_getSize(dateTimePatterns) <= kDateTime)
    {
        status = U_INVALID_FORMAT_ERROR;
        return;
    }

    setLocaleIDs(ures_getLocaleByType(dateTimePatterns, ULOC_VALID_LOCALE, &status),
                 ures_getLocaleByType(dateTimePatterns, ULOC_ACTUAL_LOCALE, &status));

    // create a symbols object from the locale
    initializeSymbols(locale,fCalendar, status);
    if (U_FAILURE(status)) return;
    /* test for NULL */
    if (fSymbols == 0) {
        status = U_MEMORY_ALLOCATION_ERROR;
        return;
    }

    const UChar *resStr;
    int32_t resStrLen = 0;

    // if the pattern should include both date and time information, use the date/time
    // pattern string as a guide to tell use how to glue together the appropriate date
    // and time pattern strings.  The actual gluing-together is handled by a convenience
    // method on MessageFormat.
    if ((timeStyle != kNone) && (dateStyle != kNone))
    {
        Formattable timeDateArray[2];

        // use Formattable::adoptString() so that we can use fastCopyFrom()
        // instead of Formattable::setString()'s unaware, safe, deep string clone
        // see Jitterbug 2296
        resStr = ures_getStringByIndex(dateTimePatterns, (int32_t)timeStyle, &resStrLen, &status);
        timeDateArray[0].adoptString(new UnicodeString(TRUE, resStr, resStrLen));
        resStr = ures_getStringByIndex(dateTimePatterns, (int32_t)dateStyle, &resStrLen, &status);
        timeDateArray[1].adoptString(new UnicodeString(TRUE, resStr, resStrLen));

        resStr = ures_getStringByIndex(dateTimePatterns, (int32_t)kDateTime, &resStrLen, &status);
        MessageFormat::format(UnicodeString(TRUE, resStr, resStrLen), timeDateArray, 2, fPattern, status);
    }
    // if the pattern includes just time data or just date date, load the appropriate
    // pattern string from the resources
    // setTo() - see DateFormatSymbols::assignArray comments
    else if (timeStyle != kNone) {
        resStr = ures_getStringByIndex(dateTimePatterns, (int32_t)timeStyle, &resStrLen, &status);
        fPattern.setTo(TRUE, resStr, resStrLen);
    }
    else if (dateStyle != kNone) {
        resStr = ures_getStringByIndex(dateTimePatterns, (int32_t)dateStyle, &resStrLen, &status);
        fPattern.setTo(TRUE, resStr, resStrLen);
    }
    
    // and if it includes _neither_, that's an error
    else
        status = U_INVALID_FORMAT_ERROR;

    // finally, finish initializing by creating a Calendar and a NumberFormat
    initialize(locale, status);
}

//----------------------------------------------------------------------

Calendar*
SimpleDateFormat::initializeCalendar(TimeZone* adoptZone, const Locale& locale, UErrorCode& status)
{
    if(!U_FAILURE(status)) {
        fCalendar = Calendar::createInstance(adoptZone?adoptZone:TimeZone::createDefault(), locale, status);
    }
    if (U_SUCCESS(status) && fCalendar == NULL) {
        status = U_MEMORY_ALLOCATION_ERROR;
    }
    return fCalendar;
}

void
SimpleDateFormat::initializeSymbols(const Locale& locale, Calendar* calendar, UErrorCode& status)
{
  if(U_FAILURE(status)) {
    fSymbols = NULL;
  } else {
    // pass in calendar type - use NULL (default) if no calendar set (or err).
    fSymbols = new DateFormatSymbols(locale, calendar?calendar->getType() :NULL , status);
  }
}

void
SimpleDateFormat::initialize(const Locale& locale,
                             UErrorCode& status)
{
    if (U_FAILURE(status)) return;

    // We don't need to check that the row count is >= 1, since all 2d arrays have at
    // least one row
    fNumberFormat = NumberFormat::createInstance(locale, status);
    if (fNumberFormat != NULL && U_SUCCESS(status))
    {
        // no matter what the locale's default number format looked like, we want
        // to modify it so that it doesn't use thousands separators, doesn't always
        // show the decimal point, and recognizes integers only when parsing

        fNumberFormat->setGroupingUsed(FALSE);
        if (fNumberFormat->getDynamicClassID() == DecimalFormat::getStaticClassID())
            ((DecimalFormat*)fNumberFormat)->setDecimalSeparatorAlwaysShown(FALSE);
        fNumberFormat->setParseIntegerOnly(TRUE);
        fNumberFormat->setMinimumFractionDigits(0); // To prevent "Jan 1.00, 1997.00"
    }
    else if (U_SUCCESS(status))
    {
        status = U_MISSING_RESOURCE_ERROR;
    }
}

/* Initialize the fields we use to disambiguate ambiguous years. Separate
 * so we can call it from readObject().
 */
void SimpleDateFormat::initializeDefaultCentury() 
{
  if(fCalendar) {
    fHaveDefaultCentury = fCalendar->haveDefaultCentury();
    if(fHaveDefaultCentury) {
      fDefaultCenturyStart = fCalendar->defaultCenturyStart();
      fDefaultCenturyStartYear = fCalendar->defaultCenturyStartYear();
    } else {
      fDefaultCenturyStart = DBL_MIN;
      fDefaultCenturyStartYear = -1;
    }
  }
}

/* Define one-century window into which to disambiguate dates using
 * two-digit years. Make public in JDK 1.2.
 */
void SimpleDateFormat::parseAmbiguousDatesAsAfter(UDate startDate, UErrorCode& status) 
{
    if(U_FAILURE(status)) {
        return;
    }
    if(!fCalendar) {
      status = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }
        
    fCalendar->setTime(startDate, status);
    if(U_SUCCESS(status)) {
        fHaveDefaultCentury = TRUE;
        fDefaultCenturyStart = startDate;
        fDefaultCenturyStartYear = fCalendar->get(UCAL_YEAR, status);
    }
}
    
//----------------------------------------------------------------------

UnicodeString&
SimpleDateFormat::format(Calendar& cal, UnicodeString& appendTo, FieldPosition& pos) const
{
    UErrorCode status = U_ZERO_ERROR;
    pos.setBeginIndex(0);
    pos.setEndIndex(0);

    UBool inQuote = FALSE;
    UChar prevCh = 0;
    int32_t count = 0;
    
    // loop through the pattern string character by character
    for (int32_t i = 0; i < fPattern.length() && U_SUCCESS(status); ++i) {
        UChar ch = fPattern[i];
        
        // Use subFormat() to format a repeated pattern character
        // when a different pattern or non-pattern character is seen
        if (ch != prevCh && count > 0) {
            subFormat(appendTo, prevCh, count, pos, cal, status);
            count = 0;
        }
        if (ch == QUOTE) {
            // Consecutive single quotes are a single quote literal,
            // either outside of quotes or between quotes
            if ((i+1) < fPattern.length() && fPattern[i+1] == QUOTE) {
                appendTo += (UChar)QUOTE;
                ++i;
            } else {
                inQuote = ! inQuote;
            }
        } 
        else if ( ! inQuote && ((ch >= 0x0061 /*'a'*/ && ch <= 0x007A /*'z'*/) 
                    || (ch >= 0x0041 /*'A'*/ && ch <= 0x005A /*'Z'*/))) {
            // ch is a date-time pattern character to be interpreted
            // by subFormat(); count the number of times it is repeated
            prevCh = ch;
            ++count;
        }
        else {
            // Append quoted characters and unquoted non-pattern characters
            appendTo += ch;
        }
    }

    // Format the last item in the pattern, if any
    if (count > 0) {
        subFormat(appendTo, prevCh, count, pos, cal, status);
    }

    // and if something failed (e.g., an invalid format character), reset our FieldPosition
    // to (0, 0) to show that
    // {sfb} look at this later- are these being set correctly?
    if (U_FAILURE(status)) {
        pos.setBeginIndex(0);
        pos.setEndIndex(0);
    }
    
    return appendTo;
}

UnicodeString&
SimpleDateFormat::format(const Formattable& obj, 
                         UnicodeString& appendTo, 
                         FieldPosition& pos,
                         UErrorCode& status) const
{
    // this is just here to get around the hiding problem
    // (the previous format() override would hide the version of
    // format() on DateFormat that this function correspond to, so we
    // have to redefine it here)
    return DateFormat::format(obj, appendTo, pos, status);
}

//----------------------------------------------------------------------

// Map index into pattern character string to Calendar field number.
const UCalendarDateFields
SimpleDateFormat::fgPatternIndexToCalendarField[] =
{
    /*GyM*/ UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
    /*dkH*/ UCAL_DATE, UCAL_HOUR_OF_DAY, UCAL_HOUR_OF_DAY,
    /*msS*/ UCAL_MINUTE, UCAL_SECOND, UCAL_MILLISECOND,
    /*EDF*/ UCAL_DAY_OF_WEEK, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK_IN_MONTH,
    /*wWa*/ UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_AM_PM,
    /*hKz*/ UCAL_HOUR, UCAL_HOUR, UCAL_ZONE_OFFSET,
    /*Yeu*/ UCAL_YEAR_WOY, UCAL_DOW_LOCAL, UCAL_EXTENDED_YEAR,
    /*gAZ*/ UCAL_JULIAN_DAY, UCAL_MILLISECONDS_IN_DAY, UCAL_ZONE_OFFSET,
    /*v*/   UCAL_ZONE_OFFSET,
    /*c*/   UCAL_DAY_OF_WEEK,
    /*L*/   UCAL_MONTH,
    /*Q*/   UCAL_MONTH,
    /*q*/   UCAL_MONTH,
};

// Map index into pattern character string to DateFormat field number
const UDateFormatField
SimpleDateFormat::fgPatternIndexToDateFormatField[] = {
    /*GyM*/ UDAT_ERA_FIELD, UDAT_YEAR_FIELD, UDAT_MONTH_FIELD,
    /*dkH*/ UDAT_DATE_FIELD, UDAT_HOUR_OF_DAY1_FIELD, UDAT_HOUR_OF_DAY0_FIELD,
    /*msS*/ UDAT_MINUTE_FIELD, UDAT_SECOND_FIELD, UDAT_FRACTIONAL_SECOND_FIELD,
    /*EDF*/ UDAT_DAY_OF_WEEK_FIELD, UDAT_DAY_OF_YEAR_FIELD, UDAT_DAY_OF_WEEK_IN_MONTH_FIELD,
    /*wWa*/ UDAT_WEEK_OF_YEAR_FIELD, UDAT_WEEK_OF_MONTH_FIELD, UDAT_AM_PM_FIELD,
    /*hKz*/ UDAT_HOUR1_FIELD, UDAT_HOUR0_FIELD, UDAT_TIMEZONE_FIELD,
    /*Yeu*/ UDAT_YEAR_WOY_FIELD, UDAT_DOW_LOCAL_FIELD, UDAT_EXTENDED_YEAR_FIELD,
    /*gAZ*/ UDAT_JULIAN_DAY_FIELD, UDAT_MILLISECONDS_IN_DAY_FIELD, UDAT_TIMEZONE_RFC_FIELD,
    /*v*/   UDAT_TIMEZONE_GENERIC_FIELD,
    /*c*/   UDAT_STANDALONE_DAY_FIELD,
    /*L*/   UDAT_STANDALONE_MONTH_FIELD,
    /*Q*/   UDAT_QUARTER_FIELD,
    /*q*/   UDAT_STANDALONE_QUARTER_FIELD,
};

//----------------------------------------------------------------------

/**
 * Append symbols[value] to dst.  Make sure the array index is not out
 * of bounds.
 */
static inline void
_appendSymbol(UnicodeString& dst,
              int32_t value,
              const UnicodeString* symbols,
              int32_t symbolsCount) {
    U_ASSERT(0 <= value && value < symbolsCount);
    if (0 <= value && value < symbolsCount) {
        dst += symbols[value];
    }
}

//---------------------------------------------------------------------
inline void SimpleDateFormat::appendGMT(UnicodeString &appendTo, Calendar& cal, UErrorCode& status) const{
    int32_t value = cal.get(UCAL_ZONE_OFFSET, status) +
    cal.get(UCAL_DST_OFFSET, status);

    if (value < 0) {
        appendTo += gGmtMinus;
        value = -value; // suppress the '-' sign for text display.
    }else{
        appendTo += gGmtPlus;
    }

    zeroPaddingNumber(appendTo, (int32_t)(value/U_MILLIS_PER_HOUR), 2, 2);
    appendTo += (UChar)0x003A /*':'*/;
    zeroPaddingNumber(appendTo, (int32_t)((value%U_MILLIS_PER_HOUR)/U_MILLIS_PER_MINUTE), 2, 2);
}

//---------------------------------------------------------------------
void
SimpleDateFormat::subFormat(UnicodeString &appendTo,
                            UChar ch,
                            int32_t count,
                            FieldPosition& pos,
                            Calendar& cal,
                            UErrorCode& status) const
{
    if (U_FAILURE(status)) {
        return;
    }

    // this function gets called by format() to produce the appropriate substitution
    // text for an individual pattern symbol (e.g., "HH" or "yyyy")

    UChar *patternCharPtr = u_strchr(DateFormatSymbols::getPatternUChars(), ch);
    UDateFormatField patternCharIndex;
    const int32_t maxIntCount = 10;
    int32_t beginOffset = appendTo.length();

    // if the pattern character is unrecognized, signal an error and dump out
    if (patternCharPtr == NULL)
    {
        status = U_INVALID_FORMAT_ERROR;
        return;
    }

    patternCharIndex = (UDateFormatField)(patternCharPtr - DateFormatSymbols::getPatternUChars());
    UCalendarDateFields field = fgPatternIndexToCalendarField[patternCharIndex];
    int32_t value = cal.get(field, status);
    if (U_FAILURE(status)) {
        return;
    }

    switch (patternCharIndex) {
    
    // for any "G" symbol, write out the appropriate era string
    // "GGGG" is wide era name, anything else is abbreviated name
    case UDAT_ERA_FIELD:
        if (count >= 4)
           _appendSymbol(appendTo, value, fSymbols->fEraNames, fSymbols->fEraNamesCount);
        else
           _appendSymbol(appendTo, value, fSymbols->fEras, fSymbols->fErasCount);
        break;

    // for "yyyy", write out the whole year; for "yy", write out the last 2 digits
    case UDAT_YEAR_FIELD:
    case UDAT_YEAR_WOY_FIELD:
        if (count >= 4) 
            zeroPaddingNumber(appendTo, value, 4, maxIntCount);
        else if(count == 1) 
            zeroPaddingNumber(appendTo, value, count, maxIntCount);
        else
            zeroPaddingNumber(appendTo, value, 2, 2);
        break;  // TODO: this needs to be synced with Java, with GCL/Shanghai's work

    // for "MMMM", write out the whole month name, for "MMM", write out the month
    // abbreviation, for "M" or "MM", write out the month as a number with the
    // appropriate number of digits
    // for "MMMMM", use the narrow form
    case UDAT_MONTH_FIELD:
        if (count == 5) 
            _appendSymbol(appendTo, value, fSymbols->fNarrowMonths,
                          fSymbols->fNarrowMonthsCount);
        else if (count == 4) 
            _appendSymbol(appendTo, value, fSymbols->fMonths,
                          fSymbols->fMonthsCount);
        else if (count == 3) 
            _appendSymbol(appendTo, value, fSymbols->fShortMonths,
                          fSymbols->fShortMonthsCount);
        else 
            zeroPaddingNumber(appendTo, value + 1, count, maxIntCount);
        break;

    // for "LLLL", write out the whole month name, for "LLL", write out the month
    // abbreviation, for "L" or "LL", write out the month as a number with the
    // appropriate number of digits
    // for "LLLLL", use the narrow form
    case UDAT_STANDALONE_MONTH_FIELD:
        if (count == 5) 
            _appendSymbol(appendTo, value, fSymbols->fStandaloneNarrowMonths,
                          fSymbols->fStandaloneNarrowMonthsCount);
        else if (count == 4) 
            _appendSymbol(appendTo, value, fSymbols->fStandaloneMonths,
                          fSymbols->fStandaloneMonthsCount);
        else if (count == 3) 
            _appendSymbol(appendTo, value, fSymbols->fStandaloneShortMonths,
                          fSymbols->fStandaloneShortMonthsCount);
        else 
            zeroPaddingNumber(appendTo, value + 1, count, maxIntCount);
        break;

    // for "k" and "kk", write out the hour, adjusting midnight to appear as "24"
    case UDAT_HOUR_OF_DAY1_FIELD:
        if (value == 0) 
            zeroPaddingNumber(appendTo, cal.getMaximum(UCAL_HOUR_OF_DAY) + 1, count, maxIntCount);
        else 
            zeroPaddingNumber(appendTo, value, count, maxIntCount);
        break;

    case UDAT_FRACTIONAL_SECOND_FIELD:
        // Fractional seconds left-justify
        {
            fNumberFormat->setMinimumIntegerDigits((count > 3) ? 3 : count);
            fNumberFormat->setMaximumIntegerDigits(maxIntCount);
            if (count == 1) {
                value = (value + 50) / 100;
            } else if (count == 2) {
                value = (value + 5) / 10;
            }
            FieldPosition p(0);
            fNumberFormat->format(value, appendTo, p);
            if (count > 3) {
                fNumberFormat->setMinimumIntegerDigits(count - 3);
                fNumberFormat->format((int32_t)0, appendTo, p);
            }
        }
        break;

    // for "EEE", write out the abbreviated day-of-the-week name
    // for "EEEE", write out the wide day-of-the-week name
    // for "EEEEE", use the narrow day-of-the-week name
    case UDAT_DAY_OF_WEEK_FIELD:
        if (count == 5) 
            _appendSymbol(appendTo, value, fSymbols->fNarrowWeekdays,
                          fSymbols->fNarrowWeekdaysCount);
        else if (count == 4) 
            _appendSymbol(appendTo, value, fSymbols->fWeekdays,
                          fSymbols->fWeekdaysCount);
        else
            _appendSymbol(appendTo, value, fSymbols->fShortWeekdays,
                          fSymbols->fShortWeekdaysCount);
        break;

    // for "ccc", write out the abbreviated day-of-the-week name
    // for "cccc", write out the wide day-of-the-week name
    // for "ccccc", use the narrow day-of-the-week name
    case UDAT_STANDALONE_DAY_FIELD:
        if (count == 5) 
            _appendSymbol(appendTo, value, fSymbols->fStandaloneNarrowWeekdays,
                          fSymbols->fStandaloneNarrowWeekdaysCount);
        else if (count == 4) 
            _appendSymbol(appendTo, value, fSymbols->fStandaloneWeekdays,
                          fSymbols->fStandaloneWeekdaysCount);
        else if (count == 3)
            _appendSymbol(appendTo, value, fSymbols->fStandaloneShortWeekdays,
                          fSymbols->fStandaloneShortWeekdaysCount);
        else
            zeroPaddingNumber(appendTo, value, 1, maxIntCount);
        break;

    // for and "a" symbol, write out the whole AM/PM string
    case UDAT_AM_PM_FIELD:
        _appendSymbol(appendTo, value, fSymbols->fAmPms,
                      fSymbols->fAmPmsCount);
        break;

    // for "h" and "hh", write out the hour, adjusting noon and midnight to show up
    // as "12"
    case UDAT_HOUR1_FIELD:
        if (value == 0) 
            zeroPaddingNumber(appendTo, cal.getLeastMaximum(UCAL_HOUR) + 1, count, maxIntCount);
        else 
            zeroPaddingNumber(appendTo, value, count, maxIntCount);
        break;

    // for the "z" symbols, we have to check our time zone data first.  If we have a
    // localized name for the time zone, then "zzzz" / "zzz" indicate whether
    // daylight time is in effect (long/short) and "zz" / "z" do not (long/short).
    // If we don't have a localized time zone name,
    // then the time zone shows up as "GMT+hh:mm" or "GMT-hh:mm" (where "hh:mm" is the
    // offset from GMT) regardless of how many z's were in the pattern symbol
    case UDAT_TIMEZONE_FIELD: 
    case UDAT_TIMEZONE_GENERIC_FIELD: {
        UnicodeString str;
        UnicodeString zid;
        UnicodeString displayString;
        zid = fSymbols->getZoneID(cal.getTimeZone().getID(str), zid, status);
        if(U_FAILURE(status)){
            break;
        }
        if (zid.length() == 0) {
            appendGMT(appendTo, cal, status);
        }
        else {

            if (patternCharIndex == UDAT_TIMEZONE_GENERIC_FIELD) {
                if(count < 4){
                    fSymbols->getZoneString(zid, DateFormatSymbols::TIMEZONE_SHORT_GENERIC, displayString, status);
                }else{
                    fSymbols->getZoneString(zid, DateFormatSymbols::TIMEZONE_LONG_GENERIC, displayString, status);
                }
            } else {
                if (cal.get(UCAL_DST_OFFSET, status) != 0) {
                    if(count < 4){
                        fSymbols->getZoneString(zid, DateFormatSymbols::TIMEZONE_SHORT_DAYLIGHT, displayString, status);
                    }else{
                        fSymbols->getZoneString(zid, DateFormatSymbols::TIMEZONE_LONG_DAYLIGHT, displayString, status);
                    }
                }else{
                    if(count < 4){
                        fSymbols->getZoneString(zid, DateFormatSymbols::TIMEZONE_SHORT_STANDARD, displayString, status);
                    }else{
                        fSymbols->getZoneString(zid, DateFormatSymbols::TIMEZONE_LONG_STANDARD, displayString, status);
                    }
                }
            }
            if(displayString.length()==0){
                appendGMT(appendTo, cal, status);
            }else{
                appendTo += displayString;
            }
        }
      }
    break;
    
    case 23: // 'Z' - TIMEZONE_RFC
        {
            UChar sign = 43/*'+'*/;
            value = (cal.get(UCAL_ZONE_OFFSET, status) +
                     cal.get(UCAL_DST_OFFSET, status)) / U_MILLIS_PER_MINUTE;
            if (value < 0) {
                value = -value;
                sign = 45/*'-'*/;
            }
            value = (value / 3) * 5 + (value % 60); // minutes => KKmm
            appendTo += sign;
            zeroPaddingNumber(appendTo, value, 4, 4);
        }
        break;

    case UDAT_QUARTER_FIELD:
        if (count >= 4) 
            _appendSymbol(appendTo, value/3, fSymbols->fQuarters,
                          fSymbols->fQuartersCount);
        else if (count == 3) 
            _appendSymbol(appendTo, value/3, fSymbols->fShortQuarters,
                          fSymbols->fShortQuartersCount);
        else 
            zeroPaddingNumber(appendTo, (value/3) + 1, count, maxIntCount);
        break;

    case UDAT_STANDALONE_QUARTER_FIELD:
        if (count >= 4) 
            _appendSymbol(appendTo, value/3, fSymbols->fStandaloneQuarters,
                          fSymbols->fStandaloneQuartersCount);
        else if (count == 3) 
            _appendSymbol(appendTo, value/3, fSymbols->fStandaloneShortQuarters,
                          fSymbols->fStandaloneShortQuartersCount);
        else 
            zeroPaddingNumber(appendTo, (value/3) + 1, count, maxIntCount);
        break;


    // all of the other pattern symbols can be formatted as simple numbers with
    // appropriate zero padding
    default:
        zeroPaddingNumber(appendTo, value, count, maxIntCount);
        break;
    }

    // if the field we're formatting is the one the FieldPosition says it's interested
    // in, fill in the FieldPosition with this field's positions
    if (pos.getBeginIndex() == pos.getEndIndex() &&
        pos.getField() == fgPatternIndexToDateFormatField[patternCharIndex]) {
        pos.setBeginIndex(beginOffset);
        pos.setEndIndex(appendTo.length());
    }
}

//----------------------------------------------------------------------

void
SimpleDateFormat::zeroPaddingNumber(UnicodeString &appendTo, int32_t value, int32_t minDigits, int32_t maxDigits) const
{
    FieldPosition pos(0);

    fNumberFormat->setMinimumIntegerDigits(minDigits);
    fNumberFormat->setMaximumIntegerDigits(maxDigits);
    fNumberFormat->format(value, appendTo, pos);  // 3rd arg is there to speed up processing
}

//----------------------------------------------------------------------

/**
 * Format characters that indicate numeric fields.  The character
 * at index 0 is treated specially.
 */
static const UChar NUMERIC_FORMAT_CHARS[] = {0x4D, 0x79, 0x75, 0x64, 0x68, 0x48, 0x6D, 0x73, 0x53, 0x44, 0x46, 0x77, 0x57, 0x6B, 0x4B, 0x00}; /* "MyudhHmsSDFwWkK" */

/**
 * Return true if the given format character, occuring count
 * times, represents a numeric field.
 */
UBool SimpleDateFormat::isNumeric(UChar formatChar, int32_t count) {
    UnicodeString s(NUMERIC_FORMAT_CHARS);
    int32_t i = s.indexOf(formatChar);
    return (i > 0 || (i == 0 && count < 3));
}

void
SimpleDateFormat::parse(const UnicodeString& text, Calendar& cal, ParsePosition& parsePos) const
{
    int32_t pos = parsePos.getIndex();
    int32_t start = pos;
    UBool ambiguousYear[] = { FALSE };
    int32_t count = 0;

    // hack, clear parsedTimeZone, cast away const
    delete parsedTimeZone;
    ((SimpleDateFormat*)this)->parsedTimeZone = NULL;

    // For parsing abutting numeric fields. 'abutPat' is the
    // offset into 'pattern' of the first of 2 or more abutting
    // numeric fields.  'abutStart' is the offset into 'text'
    // where parsing the fields begins. 'abutPass' starts off as 0
    // and increments each time we try to parse the fields.
    int32_t abutPat = -1; // If >=0, we are in a run of abutting numeric fields
    int32_t abutStart = 0;
    int32_t abutPass = 0;
    UBool inQuote = FALSE;

    const UnicodeString numericFormatChars(NUMERIC_FORMAT_CHARS);

    for (int32_t i=0; i<fPattern.length(); ++i) {
        UChar ch = fPattern.charAt(i);

        // Handle alphabetic field characters.
        if (!inQuote && ((ch >= 0x41 && ch <= 0x5A) || (ch >= 0x61 && ch <= 0x7A))) { // [A-Za-z]
            int32_t fieldPat = i;

            // Count the length of this field specifier
            count = 1;
            while ((i+1)<fPattern.length() &&
                   fPattern.charAt(i+1) == ch) {
                ++count;
                ++i;
            }

            if (isNumeric(ch, count)) {
                if (abutPat < 0) {
                    // Determine if there is an abutting numeric field.  For
                    // most fields we can just look at the next characters,
                    // but the 'm' field is either numeric or text,
                    // depending on the count, so we have to look ahead for
                    // that field.
                    if ((i+1)<fPattern.length()) {
                        UBool abutting;
                        UChar nextCh = fPattern.charAt(i+1);
                        int32_t k = numericFormatChars.indexOf(nextCh);
                        if (k == 0) {
                            int32_t j = i+2;
                            while (j<fPattern.length() &&
                                   fPattern.charAt(j) == nextCh) {
                                ++j;
                            }
                            abutting = (j-i) < 4; // nextCount < 3
                        } else {
                            abutting = k > 0;
                        }

                        // Record the start of a set of abutting numeric
                        // fields.
                        if (abutting) {
                            abutPat = fieldPat;
                            abutStart = pos;
                            abutPass = 0;
                        }
                    }
                }
            } else {
                abutPat = -1; // End of any abutting fields
            }

            // Handle fields within a run of abutting numeric fields.  Take
            // the pattern "HHmmss" as an example. We will try to parse
            // 2/2/2 characters of the input text, then if that fails,
            // 1/2/2.  We only adjust the width of the leftmost field; the
            // others remain fixed.  This allows "123456" => 12:34:56, but
            // "12345" => 1:23:45.  Likewise, for the pattern "yyyyMMdd" we
            // try 4/2/2, 3/2/2, 2/2/2, and finally 1/2/2.
            if (abutPat >= 0) {
                // If we are at the start of a run of abutting fields, then
                // shorten this field in each pass.  If we can't shorten
                // this field any more, then the parse of this set of
                // abutting numeric fields has failed.
                if (fieldPat == abutPat) {
                    count -= abutPass++;
                    if (count == 0) {
                        parsePos.setIndex(start);
                        parsePos.setErrorIndex(pos);
                        return;
                    }
                }

                pos = subParse(text, pos, ch, count,
                               TRUE, FALSE, ambiguousYear, cal);

                // If the parse fails anywhere in the run, back up to the
                // start of the run and retry.
                if (pos < 0) {
                    i = abutPat - 1;
                    pos = abutStart;
                    continue;
                }
            }

            // Handle non-numeric fields and non-abutting numeric
            // fields.
            else {
                int32_t s = pos;
                pos = subParse(text, pos, ch, count,
                               FALSE, TRUE, ambiguousYear, cal);

                if (pos < 0) {
                    parsePos.setErrorIndex(s);
                    parsePos.setIndex(start);
                    return;
                }
            }
        }

        // Handle literal pattern characters.  These are any
        // quoted characters and non-alphabetic unquoted
        // characters.
        else {
                
            abutPat = -1; // End of any abutting fields

            // Handle quotes.  Two consecutive quotes is a quote
            // literal, inside or outside of quotes.  Otherwise a
            // quote indicates entry or exit from a quoted region.
            if (ch == QUOTE) {
                // Match a quote literal '' within OR outside of quotes
                if ((i+1)<fPattern.length() && fPattern.charAt(i+1)==ch) {
                    ++i; // Skip over doubled quote
                    // Fall through and treat quote as a literal
                } else {
                    // Enter or exit quoted region
                    inQuote = !inQuote;
                    continue;
                }
            }

            // A run of white space in the pattern matches a run
            // of white space in the input text.
            if (uprv_isRuleWhiteSpace(ch)) {
                // Advance over run in pattern
                while ((i+1)<fPattern.length() &&
                       uprv_isRuleWhiteSpace(fPattern.charAt(i+1))) {
                    ++i;
                }

                // Advance over run in input text
                int32_t s = pos;
                while (pos<text.length() &&
                       u_isUWhiteSpace(text.charAt(pos))) {
                    ++pos;
                }

                // Must see at least one white space char in input
                if (pos > s) {
                    continue;
                }
            } else if (pos<text.length() && text.charAt(pos)==ch) {
                // Match a literal
                ++pos;
                continue;
            }

            // We fall through to this point if the match fails
            parsePos.setIndex(start);
            parsePos.setErrorIndex(pos);
            return;
        }
    }

    // At this point the fields of Calendar have been set.  Calendar
    // will fill in default values for missing fields when the time
    // is computed.

    parsePos.setIndex(pos);

    // This part is a problem:  When we call parsedDate.after, we compute the time.
    // Take the date April 3 2004 at 2:30 am.  When this is first set up, the year
    // will be wrong if we're parsing a 2-digit year pattern.  It will be 1904.
    // April 3 1904 is a Sunday (unlike 2004) so it is the DST onset day.  2:30 am
    // is therefore an "impossible" time, since the time goes from 1:59 to 3:00 am
    // on that day.  It is therefore parsed out to fields as 3:30 am.  Then we
    // add 100 years, and get April 3 2004 at 3:30 am.  Note that April 3 2004 is
    // a Saturday, so it can have a 2:30 am -- and it should. [LIU]
    /*
        UDate parsedDate = calendar.getTime();
        if( ambiguousYear[0] && !parsedDate.after(fDefaultCenturyStart) ) {
            calendar.add(Calendar.YEAR, 100);
            parsedDate = calendar.getTime();
        }
    */
    // Because of the above condition, save off the fields in case we need to readjust.
    // The procedure we use here is not particularly efficient, but there is no other
    // way to do this given the API restrictions present in Calendar.  We minimize
    // inefficiency by only performing this computation when it might apply, that is,
    // when the two-digit year is equal to the start year, and thus might fall at the
    // front or the back of the default century.  This only works because we adjust
    // the year correctly to start with in other cases -- see subParse().
    UErrorCode status = U_ZERO_ERROR;
    if (ambiguousYear[0] || parsedTimeZone != NULL) // If this is true then the two-digit year == the default start year
    {
        // We need a copy of the fields, and we need to avoid triggering a call to
        // complete(), which will recalculate the fields.  Since we can't access
        // the fields[] array in Calendar, we clone the entire object.  This will
        // stop working if Calendar.clone() is ever rewritten to call complete().
        Calendar *copy = cal.clone();
        if (ambiguousYear[0]) {
            UDate parsedDate = copy->getTime(status);
            // {sfb} check internalGetDefaultCenturyStart
            if (fHaveDefaultCentury && (parsedDate < fDefaultCenturyStart)) {
                // We can't use add here because that does a complete() first.
                cal.set(UCAL_YEAR, fDefaultCenturyStartYear + 100);
            }
        }

        if (parsedTimeZone != NULL) {
            TimeZone *tz = parsedTimeZone;

            // the calendar represents the parse as gmt time
            // we need to turn this into local time, so we add the raw offset
            // then we ask the timezone to handle this local time
            int32_t rawOffset = 0;
            int32_t dstOffset = 0;
            tz->getOffset(copy->getTime(status)+tz->getRawOffset(), TRUE, 
                rawOffset, dstOffset, status);
            if (U_SUCCESS(status)) {
                cal.set(UCAL_ZONE_OFFSET, rawOffset);
                cal.set(UCAL_DST_OFFSET, dstOffset);
            }
        }

        delete copy;
    }

    // If any Calendar calls failed, we pretend that we
    // couldn't parse the string, when in reality this isn't quite accurate--
    // we did parse it; the Calendar calls just failed.
    if (U_FAILURE(status)) { 
        parsePos.setErrorIndex(pos);
        parsePos.setIndex(start); 
    }
}

UDate
SimpleDateFormat::parse( const UnicodeString& text,
                         ParsePosition& pos) const {
    // redefined here because the other parse() function hides this function's
    // cunterpart on DateFormat
    return DateFormat::parse(text, pos);
}

UDate
SimpleDateFormat::parse(const UnicodeString& text, UErrorCode& status) const
{
    // redefined here because the other parse() function hides this function's
    // counterpart on DateFormat
    return DateFormat::parse(text, status);
}
//----------------------------------------------------------------------

int32_t SimpleDateFormat::matchQuarterString(const UnicodeString& text,
                              int32_t start,
                              UCalendarDateFields field,
                              const UnicodeString* data,
                              int32_t dataCount,
                              Calendar& cal) const
{
    int32_t i = 0;
    int32_t count = dataCount;

    // There may be multiple strings in the data[] array which begin with
    // the same prefix (e.g., Cerven and Cervenec (June and July) in Czech).
    // We keep track of the longest match, and return that.  Note that this
    // unfortunately requires us to test all array elements.
    int32_t bestMatchLength = 0, bestMatch = -1;

    // {sfb} kludge to support case-insensitive comparison
    // {markus 2002oct11} do not just use caseCompareBetween because we do not know
    // the length of the match after case folding
    // {alan 20040607} don't case change the whole string, since the length
    // can change
    // TODO we need a case-insensitive startsWith function
    UnicodeString lcase, lcaseText;
    text.extract(start, INT32_MAX, lcaseText);
    lcaseText.foldCase();

    for (; i < count; ++i)
    {
        // Always compare if we have no match yet; otherwise only compare
        // against potentially better matches (longer strings).

        lcase.fastCopyFrom(data[i]).foldCase();
        int32_t length = lcase.length();
                    
        if (length > bestMatchLength &&
            lcaseText.compareBetween(0, length, lcase, 0, length) == 0)
        {
            bestMatch = i;
            bestMatchLength = length;
        }
    }
    if (bestMatch >= 0)
    {
        cal.set(field, bestMatch * 3);

        // Once we have a match, we have to determine the length of the
        // original source string.  This will usually be == the length of
        // the case folded string, but it may differ (e.g. sharp s).
        lcase.fastCopyFrom(data[bestMatch]).foldCase();

        // Most of the time, the length will be the same as the length
        // of the string from the locale data.  Sometimes it will be
        // different, in which case we will have to figure it out by
        // adding a character at a time, until we have a match.  We do
        // this all in one loop, where we try 'len' first (at index
        // i==0).
        int32_t len = data[bestMatch].length(); // 99+% of the time
        int32_t n = text.length() - start;
        for (i=0; i<=n; ++i) {
            int32_t j=i;
            if (i == 0) {
                j = len;
            } else if (i == len) {
                continue; // already tried this when i was 0
            }
            text.extract(start, j, lcaseText);
            lcaseText.foldCase();
            if (lcase == lcaseText) {
                return start + j;
            }
        }
    }
    
    return -start;
}

//----------------------------------------------------------------------

int32_t SimpleDateFormat::matchString(const UnicodeString& text,
                              int32_t start,
                              UCalendarDateFields field,
                              const UnicodeString* data,
                              int32_t dataCount,
                              Calendar& cal) const
{
    int32_t i = 0;
    int32_t count = dataCount;

    if (field == UCAL_DAY_OF_WEEK) i = 1;

    // There may be multiple strings in the data[] array which begin with
    // the same prefix (e.g., Cerven and Cervenec (June and July) in Czech).
    // We keep track of the longest match, and return that.  Note that this
    // unfortunately requires us to test all array elements.
    int32_t bestMatchLength = 0, bestMatch = -1;

    // {sfb} kludge to support case-insensitive comparison
    // {markus 2002oct11} do not just use caseCompareBetween because we do not know
    // the length of the match after case folding
    // {alan 20040607} don't case change the whole string, since the length
    // can change
    // TODO we need a case-insensitive startsWith function
    UnicodeString lcase, lcaseText;
    text.extract(start, INT32_MAX, lcaseText);
    lcaseText.foldCase();

    for (; i < count; ++i)
    {
        // Always compare if we have no match yet; otherwise only compare
        // against potentially better matches (longer strings).

        lcase.fastCopyFrom(data[i]).foldCase();
        int32_t length = lcase.length();
                    
        if (length > bestMatchLength &&
            lcaseText.compareBetween(0, length, lcase, 0, length) == 0)
        {
            bestMatch = i;
            bestMatchLength = length;
        }
    }
    if (bestMatch >= 0)
    {
        cal.set(field, bestMatch);

        // Once we have a match, we have to determine the length of the
        // original source string.  This will usually be == the length of
        // the case folded string, but it may differ (e.g. sharp s).
        lcase.fastCopyFrom(data[bestMatch]).foldCase();

        // Most of the time, the length will be the same as the length
        // of the string from the locale data.  Sometimes it will be
        // different, in which case we will have to figure it out by
        // adding a character at a time, until we have a match.  We do
        // this all in one loop, where we try 'len' first (at index
        // i==0).
        int32_t len = data[bestMatch].length(); // 99+% of the time
        int32_t n = text.length() - start;
        for (i=0; i<=n; ++i) {
            int32_t j=i;
            if (i == 0) {
                j = len;
            } else if (i == len) {
                continue; // already tried this when i was 0
            }
            text.extract(start, j, lcaseText);
            lcaseText.foldCase();
            if (lcase == lcaseText) {
                return start + j;
            }
        }
    }
    
    return -start;
}

//----------------------------------------------------------------------

void
SimpleDateFormat::set2DigitYearStart(UDate d, UErrorCode& status)
{
    parseAmbiguousDatesAsAfter(d, status);
}

/**
 * Private member function that converts the parsed date strings into
 * timeFields. Returns -start (for ParsePosition) if failed.
 * @param text the time text to be parsed.
 * @param start where to start parsing.
 * @param ch the pattern character for the date field text to be parsed.
 * @param count the count of a pattern character.
 * @return the new start position if matching succeeded; a negative number
 * indicating matching failure, otherwise.
 */
int32_t SimpleDateFormat::subParse(const UnicodeString& text, int32_t& start, UChar ch, int32_t count,
                           UBool obeyCount, UBool allowNegative, UBool ambiguousYear[], Calendar& cal) const
{
    Formattable number;
    int32_t value = 0;
    int32_t i;
    ParsePosition pos(0);
    int32_t patternCharIndex;
    UnicodeString temp;
    UChar *patternCharPtr = u_strchr(DateFormatSymbols::getPatternUChars(), ch);

#if defined (U_DEBUG_CAL)
    //fprintf(stderr, "%s:%d - [%c]  st=%d \n", __FILE__, __LINE__, (char) ch, start);
#endif

    if (patternCharPtr == NULL) {
        return -start;
    }

    patternCharIndex = (UDateFormatField)(patternCharPtr - DateFormatSymbols::getPatternUChars());

    UCalendarDateFields field = fgPatternIndexToCalendarField[patternCharIndex];

    // If there are any spaces here, skip over them.  If we hit the end
    // of the string, then fail.
    for (;;) {
        if (start >= text.length()) {
            return -start;
        }
        UChar32 c = text.char32At(start);
        if (!u_isUWhiteSpace(c)) {
            break;
        }
        start += UTF_CHAR_LENGTH(c);
    }
    pos.setIndex(start);

    // We handle a few special cases here where we need to parse
    // a number value.  We handle further, more generic cases below.  We need
    // to handle some of them here because some fields require extra processing on
    // the parsed value.
    if (patternCharIndex == UDAT_HOUR_OF_DAY1_FIELD ||
        patternCharIndex == UDAT_HOUR1_FIELD ||
        (patternCharIndex == UDAT_MONTH_FIELD && count <= 2) ||
        (patternCharIndex == UDAT_STANDALONE_MONTH_FIELD && count <= 2) ||
        (patternCharIndex == UDAT_QUARTER_FIELD && count <= 2) ||
        (patternCharIndex == UDAT_STANDALONE_QUARTER_FIELD && count <= 2) ||
        patternCharIndex == UDAT_YEAR_FIELD ||
        patternCharIndex == UDAT_YEAR_WOY_FIELD ||
        patternCharIndex == UDAT_FRACTIONAL_SECOND_FIELD)
    {
        int32_t parseStart = pos.getIndex();
        // It would be good to unify this with the obeyCount logic below,
        // but that's going to be difficult.
        const UnicodeString* src;

        if (obeyCount) {
            if ((start+count) > text.length()) {
                return -start;
            }

            text.extractBetween(0, start + count, temp);
            src = &temp;
        } else {
            src = &text;
        }

        parseInt(*src, number, pos, allowNegative);

        if (pos.getIndex() == parseStart)
            return -start;
        value = number.getLong();
    }

    switch (patternCharIndex) {
    case UDAT_ERA_FIELD:
        if (count == 4) {
            return matchString(text, start, UCAL_ERA, fSymbols->fEraNames, fSymbols->fEraNamesCount, cal);
        }

        return matchString(text, start, UCAL_ERA, fSymbols->fEras, fSymbols->fErasCount, cal);

    case UDAT_YEAR_FIELD:
        // If there are 3 or more YEAR pattern characters, this indicates
        // that the year value is to be treated literally, without any
        // two-digit year adjustments (e.g., from "01" to 2001).  Otherwise
        // we made adjustments to place the 2-digit year in the proper
        // century, for parsed strings from "00" to "99".  Any other string
        // is treated literally:  "2250", "-1", "1", "002".
        if (count <= 2 && (pos.getIndex() - start) == 2
            && u_isdigit(text.charAt(start))
            && u_isdigit(text.charAt(start+1)))
        {
            // Assume for example that the defaultCenturyStart is 6/18/1903.
            // This means that two-digit years will be forced into the range
            // 6/18/1903 to 6/17/2003.  As a result, years 00, 01, and 02
            // correspond to 2000, 2001, and 2002.  Years 04, 05, etc. correspond
            // to 1904, 1905, etc.  If the year is 03, then it is 2003 if the
            // other fields specify a date before 6/18, or 1903 if they specify a
            // date afterwards.  As a result, 03 is an ambiguous year.  All other
            // two-digit years are unambiguous.
          if(fHaveDefaultCentury) { // check if this formatter even has a pivot year
              int32_t ambiguousTwoDigitYear = fDefaultCenturyStartYear % 100;
              ambiguousYear[0] = (value == ambiguousTwoDigitYear);
              value += (fDefaultCenturyStartYear/100)*100 +
                (value < ambiguousTwoDigitYear ? 100 : 0);
            }
        }
        cal.set(UCAL_YEAR, value);
        return pos.getIndex();

    case UDAT_YEAR_WOY_FIELD:
        // Comment is the same as for UDAT_Year_FIELDs - look above
        if (count <= 2 && (pos.getIndex() - start) == 2
            && u_isdigit(text.charAt(start))
            && u_isdigit(text.charAt(start+1))
            && fHaveDefaultCentury )
        {
            int32_t ambiguousTwoDigitYear = fDefaultCenturyStartYear % 100;
            ambiguousYear[0] = (value == ambiguousTwoDigitYear);
            value += (fDefaultCenturyStartYear/100)*100 +
                (value < ambiguousTwoDigitYear ? 100 : 0);
        }
        cal.set(UCAL_YEAR_WOY, value);
        return pos.getIndex();

    case UDAT_MONTH_FIELD:
        if (count <= 2) // i.e., M or MM.
        {
            // Don't want to parse the month if it is a string
            // while pattern uses numeric style: M or MM.
            // [We computed 'value' above.]
            cal.set(UCAL_MONTH, value - 1);
            return pos.getIndex();
        } else {
            // count >= 3 // i.e., MMM or MMMM
            // Want to be able to parse both short and long forms.
            // Try count == 4 first:
            int32_t newStart = 0;

            if ((newStart = matchString(text, start, UCAL_MONTH,
                                      fSymbols->fMonths, fSymbols->fMonthsCount, cal)) > 0)
                return newStart;
            else // count == 4 failed, now try count == 3
                return matchString(text, start, UCAL_MONTH,
                                   fSymbols->fShortMonths, fSymbols->fShortMonthsCount, cal);
        }

    case UDAT_STANDALONE_MONTH_FIELD:
        if (count <= 2) // i.e., L or LL.
        {
            // Don't want to parse the month if it is a string
            // while pattern uses numeric style: M or MM.
            // [We computed 'value' above.]
            cal.set(UCAL_MONTH, value - 1);
            return pos.getIndex();
        } else {
            // count >= 3 // i.e., LLL or LLLL
            // Want to be able to parse both short and long forms.
            // Try count == 4 first:
            int32_t newStart = 0;

            if ((newStart = matchString(text, start, UCAL_MONTH,
                                      fSymbols->fStandaloneMonths, fSymbols->fStandaloneMonthsCount, cal)) > 0)
                return newStart;
            else // count == 4 failed, now try count == 3
                return matchString(text, start, UCAL_MONTH,
                                   fSymbols->fStandaloneShortMonths, fSymbols->fStandaloneShortMonthsCount, cal);
        }

    case UDAT_HOUR_OF_DAY1_FIELD:
        // [We computed 'value' above.]
        if (value == cal.getMaximum(UCAL_HOUR_OF_DAY) + 1) 
            value = 0;
        cal.set(UCAL_HOUR_OF_DAY, value);
        return pos.getIndex();

    case UDAT_FRACTIONAL_SECOND_FIELD:
        // Fractional seconds left-justify
        i = pos.getIndex() - start;
        if (i < 3) {
            while (i < 3) {
                value *= 10;
                i++;
            }
        } else {
            int32_t a = 1;
            while (i > 3) {
                a *= 10;
                i--;
            }
            value = (value + (a>>1)) / a;
        }
        cal.set(UCAL_MILLISECOND, value);
        return pos.getIndex();

    case UDAT_DAY_OF_WEEK_FIELD:
        {
            // Want to be able to parse both short and long forms.
            // Try count == 4 (DDDD) first:
            int32_t newStart = 0;
            if ((newStart = matchString(text, start, UCAL_DAY_OF_WEEK,
                                      fSymbols->fWeekdays, fSymbols->fWeekdaysCount, cal)) > 0)
                return newStart;
            else // DDDD failed, now try DDD
                return matchString(text, start, UCAL_DAY_OF_WEEK,
                                   fSymbols->fShortWeekdays, fSymbols->fShortWeekdaysCount, cal);
        }

    case UDAT_STANDALONE_DAY_FIELD:
        {
            // Want to be able to parse both short and long forms.
            // Try count == 4 (DDDD) first:
            int32_t newStart = 0;
            if ((newStart = matchString(text, start, UCAL_DAY_OF_WEEK,
                                      fSymbols->fStandaloneWeekdays, fSymbols->fStandaloneWeekdaysCount, cal)) > 0)
                return newStart;
            else // DDDD failed, now try DDD
                return matchString(text, start, UCAL_DAY_OF_WEEK,
                                   fSymbols->fStandaloneShortWeekdays, fSymbols->fStandaloneShortWeekdaysCount, cal);
        }

    case UDAT_AM_PM_FIELD:
        return matchString(text, start, UCAL_AM_PM, fSymbols->fAmPms, fSymbols->fAmPmsCount, cal);

    case UDAT_HOUR1_FIELD:
        // [We computed 'value' above.]
        if (value == cal.getLeastMaximum(UCAL_HOUR)+1) 
            value = 0;
        cal.set(UCAL_HOUR, value);
        return pos.getIndex();

    case UDAT_QUARTER_FIELD:
        if (count <= 2) // i.e., Q or QQ.
        {
            // Don't want to parse the month if it is a string
            // while pattern uses numeric style: Q or QQ.
            // [We computed 'value' above.]
            cal.set(UCAL_MONTH, (value - 1) * 3);
            return pos.getIndex();
        } else {
            // count >= 3 // i.e., QQQ or QQQQ
            // Want to be able to parse both short and long forms.
            // Try count == 4 first:
            int32_t newStart = 0;

            if ((newStart = matchQuarterString(text, start, UCAL_MONTH,
                                      fSymbols->fQuarters, fSymbols->fQuartersCount, cal)) > 0)
                return newStart;
            else // count == 4 failed, now try count == 3
                return matchQuarterString(text, start, UCAL_MONTH,
                                   fSymbols->fShortQuarters, fSymbols->fShortQuartersCount, cal);
        }

    case UDAT_STANDALONE_QUARTER_FIELD:
        if (count <= 2) // i.e., q or qq.
        {
            // Don't want to parse the month if it is a string
            // while pattern uses numeric style: q or q.
            // [We computed 'value' above.]
            cal.set(UCAL_MONTH, (value - 1) * 3);
            return pos.getIndex();
        } else {
            // count >= 3 // i.e., qqq or qqqq
            // Want to be able to parse both short and long forms.
            // Try count == 4 first:
            int32_t newStart = 0;

            if ((newStart = matchQuarterString(text, start, UCAL_MONTH,
                                      fSymbols->fStandaloneQuarters, fSymbols->fStandaloneQuartersCount, cal)) > 0)
                return newStart;
            else // count == 4 failed, now try count == 3
                return matchQuarterString(text, start, UCAL_MONTH,
                                   fSymbols->fStandaloneShortQuarters, fSymbols->fStandaloneShortQuartersCount, cal);
        }

    case UDAT_TIMEZONE_FIELD:
    case UDAT_TIMEZONE_RFC_FIELD:
    case UDAT_TIMEZONE_GENERIC_FIELD:
        {
        // First try to parse generic forms such as GMT-07:00. Do this first
        // in case localized DateFormatZoneData contains the string "GMT"
        // for a zone; in that case, we don't want to match the first three
        // characters of GMT+/-HH:MM etc.

        int32_t sign = 0;
        int32_t offset;
        int32_t gmtLen = u_strlen(gGmt);

        // For time zones that have no known names, look for strings
        // of the form:
        //    GMT[+-]hours:minutes or
        //    GMT[+-]hhmm or
        //    GMT.
        
        if ((text.length() - start) >= gmtLen &&
            (text.caseCompare(start, gmtLen, gGmt, 0, gmtLen, U_FOLD_CASE_DEFAULT)) == 0)
          {
            cal.set(UCAL_DST_OFFSET, 0);

            pos.setIndex(start + gmtLen);

            if( text[pos.getIndex()] == 0x002B /*'+'*/ )
              sign = 1;
            else if( text[pos.getIndex()] == 0x002D /*'-'*/ )
              sign = -1;
            else {
              cal.set(UCAL_ZONE_OFFSET, 0 );
              return pos.getIndex();
            }

            // Look for hours:minutes or hhmm.
            pos.setIndex(pos.getIndex() + 1);
            int32_t parseStart = pos.getIndex();
            Formattable tzNumber;
            fNumberFormat->parse(text, tzNumber, pos);
            if( pos.getIndex() == parseStart) {
              return -start;
            }
            if( text[pos.getIndex()] == 0x003A /*':'*/ ) {
              // This is the hours:minutes case
              offset = tzNumber.getLong() * 60;
              pos.setIndex(pos.getIndex() + 1);
              parseStart = pos.getIndex();
              fNumberFormat->parse(text, tzNumber, pos);
              if( pos.getIndex() == parseStart) {
                return -start;
              }
              offset += tzNumber.getLong();
            }
            else {
              // This is the hhmm case.
              offset = tzNumber.getLong();
              if( offset < 24 )
                offset *= 60;
              else
                offset = offset % 100 + offset / 100 * 60;
            }

            // Fall through for final processing below of 'offset' and 'sign'.
          }
        else {
            // At this point, check for named time zones by looking through
            // the locale data from the DateFormatZoneData strings.
            // Want to be able to parse both short and long forms.
                        // !!! side effect, might set parsedZoneString 
            UErrorCode status = U_ZERO_ERROR;
            int32_t result = subParseZoneString(text, start, cal, status);
            if (result != 0) {
                return result;
            }

            // As a last resort, look for numeric timezones of the form
            // [+-]hhmm as specified by RFC 822.  This code is actually
            // a little more permissive than RFC 822.  It will try to do
            // its best with numbers that aren't strictly 4 digits long
            DecimalFormat fmt(UNICODE_STRING_SIMPLE("+####;-####"), status);
            if(U_FAILURE(status))
                return -start;
            fmt.setParseIntegerOnly(TRUE);
            int32_t parseStart = pos.getIndex();
            Formattable tzNumber;
            fmt.parse( text, tzNumber, pos );
            if( pos.getIndex() == parseStart) {
                return -start;   // Wasn't actually a number.
            }
            offset = tzNumber.getLong();
            sign = 1;
            if( offset < 0 ) {
                sign = -1;
                offset = -offset;
            }
            if( offset < 24 )
                offset = offset * 60;
            else
                offset = offset % 100 + offset / 100 * 60;

            // Fall through for final processing below of 'offset' and 'sign'.
        }

        // Do the final processing for both of the above cases.  We only
        // arrive here if the form GMT+/-... or an RFC 822 form was seen.
        if (sign != 0)
        {
            offset *= U_MILLIS_PER_MINUTE * sign;

            if (cal.getTimeZone().useDaylightTime())
            {
                cal.set(UCAL_DST_OFFSET, U_MILLIS_PER_HOUR);
                offset -= U_MILLIS_PER_HOUR;
            }
            cal.set(UCAL_ZONE_OFFSET, offset);

            return pos.getIndex();
        }

        // All efforts to parse a zone failed.
        return -start;
        }

    default:
        // Handle "generic" fields
        int32_t parseStart = pos.getIndex();
        const UnicodeString* src;
        if (obeyCount) {
            if ((start+count) > text.length()) {
                return -start;
            }
            text.extractBetween(0, start + count, temp);
            src = &temp;
        } else {
            src = &text;
        }
        parseInt(*src, number, pos, allowNegative);
        if (pos.getIndex() != parseStart) {
            cal.set(field, number.getLong());
            return pos.getIndex();
        }
        return -start;
    }
}

int32_t
SimpleDateFormat::subParseZoneString(const UnicodeString& text, int32_t start, Calendar& cal, UErrorCode& status) const
{
  // At this point, check for named time zones by looking through
  // the locale data from the DateFormatZoneData strings.
  // Want to be able to parse both short and long forms.

  // optimize for calendar's current time zone
  TimeZone *tz = NULL;
  UnicodeString id;  
  UnicodeString zid, value;
  DateFormatSymbols::TimeZoneTranslationType type;
  fSymbols->getZoneID(getTimeZone().getID(id), zid, status);
  if(zid.length() > 0){
      fSymbols->getZoneType(zid, text, start, type, value, status);
      tz = getTimeZone().clone();
  }
  
  // optimize for default time zone, assume different from caller
  if (tz == NULL) {
      TimeZone* defaultZone = TimeZone::createDefault(); 
      fSymbols->getZoneID(defaultZone->getID(id), zid, status);
      if(zid.length() > 0){
          fSymbols->getZoneType(zid, text, start, type, value, status);
          tz = defaultZone;
      }
      if (tz == NULL) {
          delete defaultZone;
      }
  }

  // still no luck, check all time zone strings
  if(tz == NULL){
      fSymbols->findZoneIDTypeValue(zid, text, start, type, value, status);
      if(zid.length() > 0){
          tz = TimeZone::createTimeZone(zid);
      }
  }

  if(U_FAILURE(status)){
      return 0;
  }
  if (tz != NULL) { // Matched any ?
    // always set zone offset, needed to get correct hour in wall time
    // when checking daylight savings
    cal.set(UCAL_ZONE_OFFSET, tz->getRawOffset());
    if (type==DateFormatSymbols::TIMEZONE_SHORT_STANDARD || type==DateFormatSymbols::TIMEZONE_LONG_STANDARD ) {
      // standard time
      cal.set(UCAL_DST_OFFSET, 0);
      delete tz; tz = NULL;
    } else if (type==DateFormatSymbols::TIMEZONE_SHORT_DAYLIGHT || type==DateFormatSymbols::TIMEZONE_LONG_DAYLIGHT ) {
      // daylight time
      // !!! todo - no getDSTSavings() in ICU's timezone
      // use the correct DST SAVINGS for the zone.
      // cal.set(UCAL_DST_OFFSET, tz->getDSTSavings());
      cal.set(UCAL_DST_OFFSET, U_MILLIS_PER_HOUR);
      delete tz; tz = NULL;
    } else { 
      // either standard or daylight
      // need to finish getting the date, then compute dst offset as appropriate

      // !!! hack for api compatibility, can't modify subParse(...) so can't
      // pass this back any other way.  cast away const.
      ((SimpleDateFormat*)this)->parsedTimeZone = tz;
    }

    return start + value.length();
  }
  

  // complete failure
  return 0;
}

/**
 * Parse an integer using fNumberFormat.  This method is semantically
 * const, but actually may modify fNumberFormat.
 */
void SimpleDateFormat::parseInt(const UnicodeString& text,
                                Formattable& number,
                                ParsePosition& pos,
                                UBool allowNegative) const {
    UnicodeString oldPrefix;
    DecimalFormat* df = NULL;
    if (!allowNegative &&
        fNumberFormat->getDynamicClassID() == DecimalFormat::getStaticClassID()) {
        df = (DecimalFormat*)fNumberFormat;
        df->getNegativePrefix(oldPrefix);
        df->setNegativePrefix(SUPPRESS_NEGATIVE_PREFIX);
    }
    fNumberFormat->parse(text, number, pos);
    if (df != NULL) {
        df->setNegativePrefix(oldPrefix);
    }
}

//----------------------------------------------------------------------

void SimpleDateFormat::translatePattern(const UnicodeString& originalPattern,
                                        UnicodeString& translatedPattern,
                                        const UnicodeString& from,
                                        const UnicodeString& to,
                                        UErrorCode& status)
{
  // run through the pattern and convert any pattern symbols from the version
  // in "from" to the corresponding character ion "to".  This code takes
  // quoted strings into account (it doesn't try to translate them), and it signals
  // an error if a particular "pattern character" doesn't appear in "from".
  // Depending on the values of "from" and "to" this can convert from generic
  // to localized patterns or localized to generic.
  if (U_FAILURE(status)) 
    return;
  
  translatedPattern.remove();
  UBool inQuote = FALSE;
  for (int32_t i = 0; i < originalPattern.length(); ++i) {
    UChar c = originalPattern[i];
    if (inQuote) {
      if (c == QUOTE) 
    inQuote = FALSE;
    }
    else {
      if (c == QUOTE) 
    inQuote = TRUE;
      else if ((c >= 0x0061 /*'a'*/ && c <= 0x007A) /*'z'*/ 
           || (c >= 0x0041 /*'A'*/ && c <= 0x005A /*'Z'*/)) {
    int32_t ci = from.indexOf(c);
    if (ci == -1) {
      status = U_INVALID_FORMAT_ERROR;
      return;
    }
    c = to[ci];
      }
    }
    translatedPattern += c;
  }
  if (inQuote) {
    status = U_INVALID_FORMAT_ERROR;
    return;
  }
}

//----------------------------------------------------------------------

UnicodeString&
SimpleDateFormat::toPattern(UnicodeString& result) const
{
    result = fPattern;
    return result;
}

//----------------------------------------------------------------------

UnicodeString&
SimpleDateFormat::toLocalizedPattern(UnicodeString& result,
                                     UErrorCode& status) const
{
    translatePattern(fPattern, result, DateFormatSymbols::getPatternUChars(), fSymbols->fLocalPatternChars, status);
    return result;
}

//----------------------------------------------------------------------

void
SimpleDateFormat::applyPattern(const UnicodeString& pattern)
{
    fPattern = pattern;
}

//----------------------------------------------------------------------

void
SimpleDateFormat::applyLocalizedPattern(const UnicodeString& pattern,
                                        UErrorCode &status)
{
    translatePattern(pattern, fPattern, fSymbols->fLocalPatternChars, DateFormatSymbols::getPatternUChars(), status);
}

//----------------------------------------------------------------------

const DateFormatSymbols*
SimpleDateFormat::getDateFormatSymbols() const
{
    return fSymbols;
}

//----------------------------------------------------------------------

void
SimpleDateFormat::adoptDateFormatSymbols(DateFormatSymbols* newFormatSymbols)
{
    delete fSymbols;
    fSymbols = newFormatSymbols;
}

//----------------------------------------------------------------------
void
SimpleDateFormat::setDateFormatSymbols(const DateFormatSymbols& newFormatSymbols)
{
    delete fSymbols;
    fSymbols = new DateFormatSymbols(newFormatSymbols);
}


//----------------------------------------------------------------------


void SimpleDateFormat::adoptCalendar(Calendar* calendarToAdopt)
{
  UErrorCode status = U_ZERO_ERROR;
  DateFormat::adoptCalendar(calendarToAdopt);
  delete fSymbols; 
  fSymbols=NULL;
  initializeSymbols(fLocale, fCalendar, status);  // we need new symbols
  initializeDefaultCentury();  // we need a new century (possibly)
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

//eof