kcalendarsystemhebrew.cpp

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/*
    Copyright (c) 2003 Hans Petter Bieker <bieker@kde.org>
    Copyright 2007, 2009, 2010 John Layt <john@layt.net>
        Calendar conversion routines based on Hdate v6, by Amos
        Shapir 1978 (rev. 1985, 1992)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

// Derived hebrew kde calendar class

#include "kcalendarsystemhebrew_p.h"
#include "kcalendarsystemprivate_p.h"

#include "kdebug.h"
#include "klocale.h"

#include <QtCore/QDate>
#include <QtCore/QCharRef>

static int hebrewDaysElapsed( int y );

class h_date
{
public:
    int hd_day;
    int hd_mon;
    int hd_year;
    int hd_dw;
    int hd_flg;
};

/*
 * compute general date structure from hebrew date
 */
static class h_date * hebrewToGregorian( int y, int m, int d )
{
    static class h_date h;
    int s;

    y -= 3744;
    s = hebrewDaysElapsed( y );
    d += s;
    s = hebrewDaysElapsed( y + 1 ) - s;    /* length of year */

    if ( s > 365 && m > 6 ) {
        --m;
        d += 30;
    }
    d += ( 59 * ( m - 1 ) + 1 ) / 2;  /* regular months */
    /* special cases */
    if ( s % 10 > 4 && m > 2 ) {  /* long Heshvan */
        d++;
    }
    if ( s % 10 < 4 && m > 3 ) {  /* short Kislev */
        d--;
    }
    // ### HPB: Broken in leap years
    //if (s > 365 && m > 6)  /* leap year */
    //  d += 30;
    d -= 6002;

    y = ( d + 36525 ) * 4 / 146097 - 1;
    d -= y / 4 * 146097 + ( y % 4 ) * 36524;
    y *= 100;

    /* compute year */
    s = ( d + 366 )*4 / 1461 - 1;
    d -= s / 4*1461 + ( s % 4 )*365;
    y += s;
    /* compute month */
    m = ( d + 245 )*12 / 367 - 7;
    d -= m*367 / 12 - 30;
    if ( ++m >= 12 ) {
        m -= 12;
        y++;
    }
    h.hd_day = d;
    h.hd_mon = m;
    h.hd_year = y;
    return( &h );
}

/*
 * compute date structure from no. of days since 1 Tishrei 3744
 */
static class h_date * gregorianToHebrew( int y, int m, int d )
{
    static class h_date h;
    int s;

    if ( ( m -= 2 ) <= 0 ) {
        m += 12;
        y--;
    }
    /* no. of days, Julian calendar */
    d += 365*y + y / 4 + 367*m / 12 + 5968;
    /* Gregorian calendar */
    d -= y / 100 - y / 400 - 2;
    h.hd_dw = ( d + 1 ) % 7;

    /* compute the year */
    y += 16;
    s = hebrewDaysElapsed( y );
    m = hebrewDaysElapsed( y + 1 );
    while( d >= m ) {  /* computed year was underestimated */
        s = m;
        y++;
        m = hebrewDaysElapsed( y + 1 );
    }
    d -= s;
    s = m - s;  /* size of current year */
    y += 3744;

    h.hd_flg = s % 10 - 4;

    /* compute day and month */
    if ( d >= s - 236 ) {  /* last 8 months are regular */
        d -= s - 236;
        m = d * 2 / 59;
        d -= ( m * 59 + 1 ) / 2;
        m += 4;
        if ( s > 365 && m <= 5 ) {  /* Adar of Meuberet */
            m += 8;
        }
    } else {
        /* first 4 months have 117-119 days */
        s = 114 + s % 10;
        m = d * 4 / s;
        d -= ( m * s + 3 ) / 4;
    }

    h.hd_day = d;
    h.hd_mon = m;
    h.hd_year = y;
    return( &h );
}

/* constants, in 1/18th of minute */
static const int HOUR = 1080;
static const int DAY = 24*HOUR;
static const int WEEK = 7*DAY;
#define M(h,p) ((h)*HOUR+p)
#define MONTH (DAY+M(12,793))

static int hebrewDaysElapsed( int y )
{
    int m, nm, dw, s, l;

    l = y * 7 + 1;  // no. of leap months
    m = y * 12 + l / 19;  // total no. of months
    l %= 19;
    nm = m * MONTH + M( 1 + 6, 779 ); // molad new year 3744 (16BC) + 6 hours
    s = m * 28 + nm / DAY - 2;

    nm %= WEEK;
    dw = nm / DAY;
    nm %= DAY;

    // special cases of Molad Zaken
    if ( (l < 12 && dw == 3 && nm >= M( 9 + 6, 204 )) ||
            (l < 7 && dw == 2 && nm >= M( 15 + 6, 589 )) ) {
        s++, dw++;
    }

    /* ADU */
    if ( dw == 1 || dw == 4 || dw == 6 ) {
        s++;
    }
    return s;
}

static int long_cheshvan( int year )
{
    QDate first, last;
    class h_date *gd;

    gd = hebrewToGregorian( year, 1, 1 );
    first.setYMD( gd->hd_year, gd->hd_mon + 1, gd->hd_day + 1 );

    gd = hebrewToGregorian( year + 1, 1, 1 );
    last.setYMD( gd->hd_year, gd->hd_mon + 1, gd->hd_day + 1 );

    return ( first.daysTo( last ) % 10 == 5 );
}

static int short_kislev( int year )
{
    QDate first, last;
    class h_date * gd;

    gd = hebrewToGregorian( year, 1, 1 );
    first.setYMD( gd->hd_year, gd->hd_mon + 1, gd->hd_day + 1 );

    gd = hebrewToGregorian( year + 1, 1, 1 );
    last.setYMD( gd->hd_year, gd->hd_mon + 1, gd->hd_day + 1 );

    return ( first.daysTo( last ) % 10 == 3 );
}

// Ok
static class h_date *toHebrew( const QDate &date )
{
    class h_date *sd;

    sd = gregorianToHebrew( date.year(), date.month(), date.day() );
    ++sd->hd_mon;
    ++sd->hd_day;

    return sd;
}

class KCalendarSystemHebrewPrivate : public KCalendarSystemPrivate
{
public:
    explicit KCalendarSystemHebrewPrivate( KCalendarSystemHebrew *q );

    virtual ~KCalendarSystemHebrewPrivate();

    // Virtual methods each calendar system must re-implement
    virtual KLocale::CalendarSystem calendarSystem() const;
    virtual void loadDefaultEraList();
    virtual int monthsInYear( int year ) const;
    virtual int daysInMonth( int year, int month ) const;
    virtual int daysInYear( int year ) const;
    virtual int daysInWeek() const;
    virtual bool isLeapYear( int year ) const;
    virtual bool hasLeapMonths() const;
    virtual bool hasYearZero() const;
    virtual int maxDaysInWeek() const;
    virtual int maxMonthsInYear() const;
    virtual int earliestValidYear() const;
    virtual int latestValidYear() const;

    virtual int integerFromString( const QString &string, int maxLength, int &readLength ) const;
    virtual QString stringFromInteger( int number, int padWidth = 0, QChar padChar = QLatin1Char('0') ) const;
    virtual QString stringFromInteger( int number, int padWidth, QChar padChar, KLocale::DigitSet digitSet ) const;

    virtual int monthNumberToMonthIndex( int year, int month ) const;
};

// Shared d pointer base class definitions

KCalendarSystemHebrewPrivate::KCalendarSystemHebrewPrivate( KCalendarSystemHebrew *q )
                             :KCalendarSystemPrivate( q )
{
}

KCalendarSystemHebrewPrivate::~KCalendarSystemHebrewPrivate()
{
}

KLocale::CalendarSystem KCalendarSystemHebrewPrivate::calendarSystem() const
{
    return KLocale::HebrewCalendar;
}

void KCalendarSystemHebrewPrivate::loadDefaultEraList()
{
    QString name, shortName, format;
    // Jewish Era, Anno Mundi, "Year of the World".
    name = i18nc( "Calendar Era: Hebrew Era, years > 0, LongFormat", "Anno Mundi" );
    shortName = i18nc( "Calendar Era: Hebrew Era, years > 0, ShortFormat", "AM" );
    format = i18nc( "(kdedt-format) Hebrew, AM, full era year format used for %EY, e.g. 2000 AM", "%Ey %EC" );
    addEra( '+', 1, q->epoch(), 1, q->latestValidDate(), name, shortName, format );
}

int KCalendarSystemHebrewPrivate::monthsInYear( int year ) const
{
    if ( isLeapYear( year ) ) {
        return 13;
    } else {
        return 12;
    }
}

int KCalendarSystemHebrewPrivate::daysInMonth( int year, int month ) const
{
    int mi = monthNumberToMonthIndex( year, month );

    if ( mi == 2 && long_cheshvan( year ) ) {
        return 30;
    }

    if ( mi == 3 && short_kislev( year ) ) {
        return 29;
    }

    if ( mi % 2 == 0 ) {  // Even number months have 29 days
        return 29;
    } else {  // Odd number months have 30 days
        return 30;
    }
}

int KCalendarSystemHebrewPrivate::daysInYear( int year ) const
{
    int days;

    // Get Regular year length
    if ( isLeapYear( year ) ) {  // Has 13 months
        days = 384;
    } else {  // Has 12 months
        days = 354;
    }

    // Check if is Deficient or Abundant year
    if ( short_kislev( year ) ) { // Deficient
        days = days - 1;
    } else if ( long_cheshvan( year ) ) { // Abundant
        days = days + 1;
    }

    return days;
}

int KCalendarSystemHebrewPrivate::daysInWeek() const
{
    return 7;
}

bool KCalendarSystemHebrewPrivate::isLeapYear( int year ) const
{
    return ( ( ( ( 7 * year ) + 1 ) % 19 ) < 7 );
}

bool KCalendarSystemHebrewPrivate::hasLeapMonths() const
{
    return true;
}

bool KCalendarSystemHebrewPrivate::hasYearZero() const
{
    return false;
}

int KCalendarSystemHebrewPrivate::maxDaysInWeek() const
{
    return 7;
}

int KCalendarSystemHebrewPrivate::maxMonthsInYear() const
{
    return 13;
}

int KCalendarSystemHebrewPrivate::earliestValidYear() const
{
    return 5344;
}

int KCalendarSystemHebrewPrivate::latestValidYear() const
{
    return 8119;
}

int KCalendarSystemHebrewPrivate::integerFromString( const QString &inputString, int maxLength, int &readLength ) const
{
    if ( locale()->language() == QLatin1String("he") ) {

        // Hebrew numbers are composed of combinations of normal letters which have a numeric value.
        // This is a non-positional system, the numeric values are simply added together, however
        // convention is for a RTL highest to lowest value ordering. There is also a degree of
        // ambiguity due to the lack of a letter for 0, hence 5 and 5000 are written the same.
        // Hebrew numbers are only used in dates.
        // See http://www.i18nguy.com/unicode/hebrew-numbers.html for more explaination

        /*
        Ref table for numbers to Hebrew chars

        Value     1       2       3        4        5       6         7        8      9

        x 1    Alef א  Bet  ב  Gimel ג  Dalet ד  He   ה  Vav  ו    Zayen ז  Het  ח  Tet  ט
               0x05D0  0x05D1  0x05D2   0x05D3   0x05D4  0x05D5    0x05D6   0x05D7  0x05D8

        x 10   Yod  י  Kaf  כ  Lamed ל  Mem  מ   Nun  נ  Samekh ס  Ayin ע   Pe   פ  Tzadi צ
               0x05D9  0x05DB  0x05DC   0x05DE   0x05E0  0x05E1    0x05E2   0x05E4  0x05E6

        x 100  Qof  ק  Resh ר  Shin ש   Tav  ת
               0x05E7  0x05E8  0x05E9   0x05EA

        Note special cases 15 = 9 + 6 = 96 טו and 16 = 9 + 7 = 97 טז
        */

        int decadeValues[14] = {10, 20, 20, 30, 40, 40, 50, 50, 60, 70, 80, 80, 90, 90};

        QChar thisChar, nextChar;
        QString string = inputString;

        int stringLength = string.length();
        readLength = 0;
        int position = 0;
        int result = 0;
        int value = 0;

        for ( ; position < stringLength ; ++position ) {

            thisChar = string[position];

            if ( position + 1 < stringLength ) {
                nextChar = string[position + 1];
                // Ignore any geresh or gershayim chars, we don't bother checking they are in the right place
                if ( nextChar == QLatin1Char('\'') ||  nextChar == QChar( 0x05F3 ) ||   // geresh
                     nextChar == QLatin1Char('\"') ||  nextChar == QChar( 0x05F4 ) ) {  // gershayim
                    string.remove( position + 1, 1 );
                    stringLength = string.length();
                    if ( position + 1 < stringLength ) {
                        nextChar = string[position + 1];
                    } else {
                        nextChar = QChar();
                    }
                    readLength = readLength + 1;
                }
            } else {
                nextChar = QChar();
            }

            if ( thisChar >= QChar( 0x05D0 ) && thisChar <= QChar( 0x05D7 ) ) {

                // If this char Alef to Het, 1 to 8, א to ח

                // If next char is any valid digit char (Alef to Tav, 1 to 400, א to ת)
                // then this char is a thousands digit
                // else this char is a ones digit

                if ( nextChar >= QChar( 0x05D0 ) && nextChar <= QChar( 0x05EA ) ) {
                    value = ( thisChar.unicode() - 0x05D0 + 1 ) * 1000;
                } else {
                    value = thisChar.unicode() - 0x05D0 + 1;
                }

            } else if ( thisChar == QChar( 0x05D8 ) ) {

                // If this char is Tet, 9, ט

                // If next char is any valid digit char (Alef to Tav, 1 to 400, א to ת)
                // and next char not 6 (Special case for 96 = 15)
                // and next char not 7 (Special case for 97 = 16)
                // then is a thousands digit else is 9

                if ( nextChar >= QChar( 0x05D0 ) && nextChar <= QChar( 0x05EA ) &&
                     nextChar != QChar( 0x05D5 ) && nextChar != QChar( 0x05D6 ) ) {
                    value = 9000;
                } else {
                    value = 9;
                }

            } else if ( thisChar >= QChar( 0x05D9 ) && thisChar <= QChar( 0x05E6 ) ) {

                // If this char Yod to Tsadi, 10 to 90, י to צ

                // If next char is a tens or hundreds char then is an error
                // Else is a tens digit

                if ( nextChar >= QChar( 0x05D9 ) ) {
                    return -1;
                } else {
                    value = decadeValues[thisChar.unicode() - 0x05D9];
                }

            } else if ( thisChar >= QChar( 0x05E7 ) && thisChar <= QChar( 0x05EA ) ) {

                // If this char Qof to Tav, 100 to 400, ק to ת, then is hundreds digit

                value = ( thisChar.unicode() - 0x05E7 + 1 ) * 100;

            } else {

                // If this char any non-digit char including whitespace or punctuation, we're done
                break;

            }

            result = result + value;

            value = 0;
        }

        readLength += position;

        return result;

    } else {
        return KCalendarSystemPrivate::integerFromString( inputString, maxLength, readLength );
    }
}

QString KCalendarSystemHebrewPrivate::stringFromInteger( int number, int padWidth, QChar padChar ) const
{
    return KCalendarSystemPrivate::stringFromInteger( number, padWidth, padChar );
}

QString KCalendarSystemHebrewPrivate::stringFromInteger( int number, int padWidth, QChar padChar, KLocale::DigitSet digitSet ) const
{
    if ( locale()->language() == QLatin1String("he") ) {

        // Hebrew numbers are composed of combinations of normal letters which have a numeric value.
        // This is a non-positional system, the numeric values are simply added together, however
        // convention is for a RTL highest to lowest value ordering. There is also a degree of
        // ambiguity due to the lack of a letter for 0, hence 5 and 5000 are written the same.
        // Hebrew numbers are only used in dates.
        // See http://www.i18nguy.com/unicode/hebrew-numbers.html for more explaination

        /*
        Ref table for numbers to Hebrew chars

        Value     1       2       3        4        5       6         7        8      9

        x 1    Alef א  Bet  ב  Gimel ג  Dalet ד  He   ה  Vav  ו    Zayen ז  Het  ח  Tet  ט
               0x05D0  0x05D1  0x05D2   0x05D3   0x05D4  0x05D5    0x05D6   0x05D7  0x05D8

        x 10   Yod  י  Kaf  כ  Lamed ל  Mem  מ   Nun  נ  Samekh ס  Ayin ע   Pe   פ  Tzadi צ
               0x05D9  0x05DB  0x05DC   0x05DE   0x05E0  0x05E1    0x05E2   0x05E4  0x05E6

        x 100  Qof  ק  Resh ר  Shin ש   Tav  ת
               0x05E7  0x05E8  0x05E9   0x05EA

        Note special cases 15 = 9 + 6 = 96 טו and 16 = 9 + 7 = 97 טז
        */

        const QChar decade[] = {
        //  Tet = ט,    Yod = י,    Kaf = כ,    Lamed = ל,  Mem = מ
        //  Nun = נ,    Samekh = ס, Ayin = ע,   Pe = פ,     Tsadi = צ
            0x05D8,     0x05D9,     0x05DB,     0x05DC,     0x05DE,
            0x05E0,     0x05E1,     0x05E2,     0x05E4,     0x05E6
        };

        QString result;

        // We have no rules for coping with numbers outside this range
        if ( number < 1 || number > 9999 ) {
            return KCalendarSystemPrivate::stringFromInteger( number, padWidth, padChar, digitSet );
        }

        // Translate the thousands digit, just uses letter for number 1..9 ( א to ט, Alef to Tet )
        // Years 5001-5999 do not have the thousands by convention
        if ( number >= 1000 ) {
            if ( number <= 5000 || number >= 6000 ) {
                result += QChar( 0x05D0 - 1 + number / 1000 );  // Alef א to Tet ט
            }
            number %= 1000;
        }

        // Translate the hundreds digit
        // Use traditional method where we only have letters assigned values for 100, 200, 300 and 400
        // so may need to repeat 400 twice to make up the required number
        if ( number >= 100 ) {
            while ( number >= 500 ) {
                result += QChar( 0x05EA );  // Tav = ת
                number -= 400;
            }
            result += QChar( 0x05E7 - 1 + number / 100 ); // Qof = ק to xxx
            number %= 100;
        }

        // Translate the tens digit
        // The numbers 15 and 16 translate to letters that spell out the name of God which is
        // forbidden, so require special treatment where 15 = 9 + 6 and 1 = 9 + 7.
        if ( number >= 10 ) {
            if ( number == 15 || number == 16 )
                number -= 9;
            result += decade[number / 10];
            number %= 10;
        }

        // Translate the ones digit, uses letter for number 1..9 ( א to ט, Alef to Tet )
        if ( number > 0 ) {
            result += QChar( 0x05D0 - 1 + number );  // Alef = א to xxx
        }

        // When used in a string with mixed names and numbers the numbers need special chars to
        // distinguish them from words composed of the same letters.
        // Single digit numbers are followed by a geresh symbol ? (Unicode = 0x05F3), but we use
        // single quote for convenience.
        // Multiple digit numbers have a gershayim symbol ? (Unicode = 0x05F4) as second-to-last
        // char, but we use double quote for convenience.
        if ( result.length() == 1 ) {
            result += QLatin1Char('\'');
        } else {
            result.insert( result.length() - 1, QLatin1Char('\"') );
        }

        return result;

    } else {
        return KCalendarSystemPrivate::stringFromInteger( number, padWidth, padChar, digitSet );
    }
}

int KCalendarSystemHebrewPrivate::monthNumberToMonthIndex( int year, int month ) const
{
    if ( isLeapYear( year ) ) {
        if ( month == 6 ) {
            return 13;        // Adar I
        } else if ( month == 7 ) {
            return 14;        // Adar II
        } else if ( month > 7 ) {
            return month - 1; // Because of Adar II
        }
    }

    return month;
}


KCalendarSystemHebrew::KCalendarSystemHebrew( const KLocale *locale )
                     : KCalendarSystem( *new KCalendarSystemHebrewPrivate( this ), KSharedConfig::Ptr(), locale ),
                       dont_use( 0 )
{
    d_ptr->loadConfig( calendarType() );
}

KCalendarSystemHebrew::KCalendarSystemHebrew( const KSharedConfig::Ptr config, const KLocale *locale )
                     : KCalendarSystem( *new KCalendarSystemHebrewPrivate( this ), config, locale ),
                       dont_use( 0 )
{
    d_ptr->loadConfig( calendarType() );
}

KCalendarSystemHebrew::KCalendarSystemHebrew( KCalendarSystemHebrewPrivate &dd,
                                              const KSharedConfig::Ptr config, const KLocale *locale )
                     : KCalendarSystem( dd, config, locale ),
                       dont_use( 0 )
{
    d_ptr->loadConfig( calendarType() );
}

KCalendarSystemHebrew::~KCalendarSystemHebrew()
{
    delete dont_use;
}

QString KCalendarSystemHebrew::calendarType() const
{
    return QLatin1String( "hebrew" );
}

QDate KCalendarSystemHebrew::epoch() const
{
    // Hebrew 0001-01-01 (Gregorian -3760-09-07, Julian -3761-10-07)
    return QDate::fromJulianDay( 347998 );
}

QDate KCalendarSystemHebrew::earliestValidDate() const
{
    // Current formulas using direct Gregorian <-> Hebrew conversion using Qt
    // will return invalid results prior to the Gregorian switchover in 1582
    // Next valid Hebrew year starts 5344-01-01 (Gregorian 1583-09-17)
    return QDate::fromJulianDay( 2299498 );
}

QDate KCalendarSystemHebrew::latestValidDate() const
{
    // Testing shows current formulas only work up to 8119-13-29 (Gregorian 4359-10-07)
    return QDate::fromJulianDay( 3313431 );
}

bool KCalendarSystemHebrew::isValid( int year, int month, int day ) const
{
    return KCalendarSystem::isValid( year, month, day );
}

bool KCalendarSystemHebrew::isValid( const QDate &date ) const
{
    return KCalendarSystem::isValid( date );
}

bool KCalendarSystemHebrew::setDate( QDate &date, int year, int month, int day ) const
{
    return KCalendarSystem::setDate( date, year, month, day );
}

// Deprecated
bool KCalendarSystemHebrew::setYMD( QDate &date, int year, int month, int day ) const
{
    return KCalendarSystem::setYMD( date, year, month, day );
}

int KCalendarSystemHebrew::year( const QDate &date ) const
{
    return KCalendarSystem::year( date );
}

int KCalendarSystemHebrew::month( const QDate &date ) const
{
    return KCalendarSystem::month( date );
}

int KCalendarSystemHebrew::day( const QDate &date ) const
{
    return KCalendarSystem::day( date );
}

QDate KCalendarSystemHebrew::addYears( const QDate &date, int nyears ) const
{
    return KCalendarSystem::addYears( date, nyears );
}

QDate KCalendarSystemHebrew::addMonths( const QDate &date, int nmonths ) const
{
    return KCalendarSystem::addMonths( date, nmonths );
}

QDate KCalendarSystemHebrew::addDays( const QDate &date, int ndays ) const
{
    return KCalendarSystem::addDays( date, ndays );
}

int KCalendarSystemHebrew::monthsInYear( const QDate &date ) const
{
    return KCalendarSystem::monthsInYear( date );
}

int KCalendarSystemHebrew::weeksInYear( const QDate &date ) const
{
    return KCalendarSystem::weeksInYear( date );
}

int KCalendarSystemHebrew::weeksInYear( int year ) const
{
    return KCalendarSystem::weeksInYear( year );
}

int KCalendarSystemHebrew::daysInYear( const QDate &date ) const
{
    return KCalendarSystem::daysInYear( date );
}

int KCalendarSystemHebrew::daysInMonth( const QDate &date ) const
{
    return KCalendarSystem::daysInMonth( date );
}

int KCalendarSystemHebrew::daysInWeek( const QDate &date ) const
{
    return KCalendarSystem::daysInWeek( date );
}

int KCalendarSystemHebrew::dayOfYear( const QDate &date ) const
{
    return KCalendarSystem::dayOfYear( date );
}

int KCalendarSystemHebrew::dayOfWeek( const QDate &date ) const
{
    class h_date * sd = toHebrew( date );
    if ( sd->hd_dw == 0 ) {
        return 7;
    } else {
        return ( sd->hd_dw );
    }
}

int KCalendarSystemHebrew::weekNumber( const QDate &date, int *yearNum ) const
{
    return KCalendarSystem::weekNumber( date, yearNum );
}

bool KCalendarSystemHebrew::isLeapYear( int year ) const
{
    return KCalendarSystem::isLeapYear( year );
}

bool KCalendarSystemHebrew::isLeapYear( const QDate &date ) const
{
    return KCalendarSystem::isLeapYear( date );
}

// ### Fixme
// JPL Fix what?
// Ask translators for short fomats of month names!
QString KCalendarSystemHebrew::monthName( int month, int year, MonthNameFormat format ) const
{
    Q_D( const KCalendarSystemHebrew );

    if ( month < 1 || month > d->monthsInYear( year ) ) {
        return QString();
    }

    // We must map month number to month index
    int monthIndex = d->monthNumberToMonthIndex( year, month );

    if ( format == ShortNamePossessive || format == LongNamePossessive ) {
        switch( monthIndex ) {
        case 1:
            return ki18n( "of Tishrey" ).toString( locale() );
        case 2:
            return ki18n( "of Heshvan" ).toString( locale() );
        case 3:
            return ki18n( "of Kislev" ).toString( locale() );
        case 4:
            return ki18n( "of Tevet" ).toString( locale() );
        case 5:
            return ki18n( "of Shvat" ).toString( locale() );
        case 6:
            return ki18n( "of Adar" ).toString( locale() );
        case 7:
            return ki18n( "of Nisan" ).toString( locale() );
        case 8:
            return ki18n( "of Iyar" ).toString( locale() );
        case 9:
            return ki18n( "of Sivan" ).toString( locale() );
        case 10:
            return ki18n( "of Tamuz" ).toString( locale() );
        case 11:
            return ki18n( "of Av" ).toString( locale() );
        case 12:
            return ki18n( "of Elul" ).toString( locale() );
        case 13:
            return ki18n( "of Adar I" ).toString( locale() );
        case 14:
            return ki18n( "of Adar II" ).toString( locale() );
        default:
            return QString();
        }
    }

    switch( monthIndex ) {
    case 1:
        return ki18n( "Tishrey" ).toString( locale() );
    case 2:
        return ki18n( "Heshvan" ).toString( locale() );
    case 3:
        return ki18n( "Kislev" ).toString( locale() );
    case 4:
        return ki18n( "Tevet" ).toString( locale() );
    case 5:
        return ki18n( "Shvat" ).toString( locale() );
    case 6:
        return ki18n( "Adar" ).toString( locale() );
    case 7:
        return ki18n( "Nisan" ).toString( locale() );
    case 8:
        return ki18n( "Iyar" ).toString( locale() );
    case 9:
        return ki18n( "Sivan" ).toString( locale() );
    case 10:
        return ki18n( "Tamuz" ).toString( locale() );
    case 11:
        return ki18n( "Av" ).toString( locale() );
    case 12:
        return ki18n( "Elul" ).toString( locale() );
    case 13:
        return ki18n( "Adar I" ).toString( locale() );
    case 14:
        return ki18n( "Adar II" ).toString( locale() );
    default:
        return QString();
    }
}

QString KCalendarSystemHebrew::monthName( const QDate& date, MonthNameFormat format ) const
{
    return monthName( month( date ), year( date ), format );
}

QString KCalendarSystemHebrew::weekDayName( int weekDay, WeekDayNameFormat format ) const
{
    // Use Western day names for now as that's what the old version did,
    // but wouldn't it be better to use the right Hebrew names like Shabbat?
    // Could make it switchable by adding new enums to WeekDayFormat, e.g. ShortNameWestern?
    if ( format == ShortDayName ) {
        switch ( weekDay ) {
        case 1:  return ki18nc( "Monday", "Mon" ).toString( locale() );
        case 2:  return ki18nc( "Tuesday", "Tue" ).toString( locale() );
        case 3:  return ki18nc( "Wednesday", "Wed" ).toString( locale() );
        case 4:  return ki18nc( "Thursday", "Thu" ).toString( locale() );
        case 5:  return ki18nc( "Friday", "Fri" ).toString( locale() );
        case 6:  return ki18nc( "Saturday", "Sat" ).toString( locale() );
        case 7:  return ki18nc( "Sunday", "Sun" ).toString( locale() );
        default: return QString();
        }
    }

    switch ( weekDay ) {
    case 1:  return ki18n( "Monday" ).toString( locale() );
    case 2:  return ki18n( "Tuesday" ).toString( locale() );
    case 3:  return ki18n( "Wednesday" ).toString( locale() );
    case 4:  return ki18n( "Thursday" ).toString( locale() );
    case 5:  return ki18n( "Friday" ).toString( locale() );
    case 6:  return ki18n( "Saturday" ).toString( locale() );
    case 7:  return ki18n( "Sunday" ).toString( locale() );
    default: return QString();
    }
}

QString KCalendarSystemHebrew::weekDayName( const QDate &date, WeekDayNameFormat format ) const
{
    return weekDayName( dayOfWeek( date ), format );
}

QString KCalendarSystemHebrew::yearString( const QDate &date, StringFormat format ) const
{
    return KCalendarSystem::yearString( date, format );
}

QString KCalendarSystemHebrew::monthString( const QDate &date, StringFormat format ) const
{
    return KCalendarSystem::monthString( date, format );
}

QString KCalendarSystemHebrew::dayString( const QDate &date, StringFormat format ) const
{
    return KCalendarSystem::dayString( date, format );
}

int KCalendarSystemHebrew::yearStringToInteger( const QString &string, int &readLength ) const
{
    int result = KCalendarSystem::yearStringToInteger( string, readLength );

    // Hebrew has no letter for 0, so 5 and 5000 are written the same
    // Assume if less than 10 then we are in an exact multiple of 1000
    if ( result < 10 ) {
        result = result * 1000;
    }

    // Not good just assuming, make configurable
    if ( result < 1000 ) {
        result += 5000; // assume we're in the 6th millenium (y6k bug)
    }

    return result;
}

int KCalendarSystemHebrew::monthStringToInteger( const QString &string, int &readLength ) const
{
    return KCalendarSystem::monthStringToInteger( string, readLength );
}

int KCalendarSystemHebrew::dayStringToInteger( const QString &string, int &readLength ) const
{
    return KCalendarSystem::yearStringToInteger( string, readLength );
}

QString KCalendarSystemHebrew::formatDate( const QDate &date, KLocale::DateFormat format ) const
{
    return KCalendarSystem::formatDate( date, format );
}

QDate KCalendarSystemHebrew::readDate( const QString &str, bool *ok ) const
{
    return KCalendarSystem::readDate( str, ok );
}

QDate KCalendarSystemHebrew::readDate( const QString &intstr, const QString &fmt, bool *ok ) const
{
    return KCalendarSystem::readDate( intstr, fmt, ok );
}

QDate KCalendarSystemHebrew::readDate( const QString &str, KLocale::ReadDateFlags flags, bool *ok ) const
{
    return KCalendarSystem::readDate( str, flags, ok );
}

int KCalendarSystemHebrew::weekDayOfPray() const
{
    return 6; // Saturday
}

int KCalendarSystemHebrew::weekStartDay() const
{
    return KCalendarSystem::weekStartDay();
}

bool KCalendarSystemHebrew::isLunar() const
{
    return false;
}

bool KCalendarSystemHebrew::isLunisolar() const
{
    return true;
}

bool KCalendarSystemHebrew::isSolar() const
{
    return false;
}

bool KCalendarSystemHebrew::isProleptic() const
{
    return false;
}

bool KCalendarSystemHebrew::julianDayToDate( int jd, int &year, int &month, int &day ) const
{
    class h_date * sd = toHebrew( QDate::fromJulianDay( jd ) );

    year = sd->hd_year;

    month = sd->hd_mon;
    if ( isLeapYear( sd->hd_year ) ) {
        if( month == 13 /*AdarI*/ ) {
            month = 6;
        } else if( month == 14 /*AdarII*/ ) {
            month = 7;
        } else if ( month > 6 && month < 13 ) {
            ++month;
        }
    }

    day = sd->hd_day;

    return true;
}

bool KCalendarSystemHebrew::dateToJulianDay( int year, int month, int day, int &jd ) const
{
    class h_date * gd = hebrewToGregorian( year, month, day );

    QDate tempDate( gd->hd_year, gd->hd_mon + 1, gd->hd_day + 1 );

    jd = tempDate.toJulianDay();

    return true;
}