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 /* ****************************************************************************** * Copyright (C) 2003-2013, International Business Machines Corporation * and others. All Rights Reserved. ****************************************************************************** * * File PERSNCAL.CPP * * Modification History: * * Date Name Description * 9/23/2003 mehran posted to icu-design * 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote * based on the implementation of Gregorian ***************************************************************************** */ #include "persncal.h" #if !UCONFIG_NO_FORMATTING #include "umutex.h" #include "gregoimp.h" // Math #include static const int16_t kPersianNumDays[] = {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year static const int8_t kPersianMonthLength[] = {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based static const int8_t kPersianLeapMonthLength[] = {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based static const int32_t kPersianCalendarLimits[UCAL_FIELD_COUNT][4] = { // Minimum Greatest Least Maximum // Minimum Maximum { 0, 0, 0, 0}, // ERA { -5000000, -5000000, 5000000, 5000000}, // YEAR { 0, 0, 11, 11}, // MONTH { 1, 1, 52, 53}, // WEEK_OF_YEAR {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH { 1, 1, 29, 31}, // DAY_OF_MONTH { 1, 1, 365, 366}, // DAY_OF_YEAR {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK { 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH }; U_NAMESPACE_BEGIN static const int32_t PERSIAN_EPOCH = 1948320; // Implementation of the PersianCalendar class //------------------------------------------------------------------------- // Constructors... //------------------------------------------------------------------------- const char *PersianCalendar::getType() const { return "persian"; } Calendar* PersianCalendar::clone() const { return new PersianCalendar(*this); } PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success) : Calendar(TimeZone::createDefault(), aLocale, success) { setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly. } PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) { } PersianCalendar::~PersianCalendar() { } //------------------------------------------------------------------------- // Minimum / Maximum access functions //------------------------------------------------------------------------- int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const { return kPersianCalendarLimits[field][limitType]; } //------------------------------------------------------------------------- // Assorted calculation utilities // /** * Determine whether a year is a leap year in the Persian calendar */ UBool PersianCalendar::isLeapYear(int32_t year) { int32_t remainder; ClockMath::floorDivide(25 * year + 11, 33, remainder); return (remainder < 8); } /** * Return the day # on which the given year starts. Days are counted * from the Persian epoch, origin 0. */ int32_t PersianCalendar::yearStart(int32_t year) { return handleComputeMonthStart(year,0,FALSE); } /** * Return the day # on which the given month starts. Days are counted * from the Persian epoch, origin 0. * * @param year The Persian year * @param year The Persian month, 0-based */ int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const { return handleComputeMonthStart(year,month,TRUE); } //---------------------------------------------------------------------- // Calendar framework //---------------------------------------------------------------------- /** * Return the length (in days) of the given month. * * @param year The Persian year * @param year The Persian month, 0-based */ int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const { // If the month is out of range, adjust it into range, and // modify the extended year value accordingly. if (month < 0 || month > 11) { extendedYear += ClockMath::floorDivide(month, 12, month); } return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month]; } /** * Return the number of days in the given Persian year */ int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const { return isLeapYear(extendedYear) ? 366 : 365; } //------------------------------------------------------------------------- // Functions for converting from field values to milliseconds.... //------------------------------------------------------------------------- // Return JD of start of given month/year int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const { // If the month is out of range, adjust it into range, and // modify the extended year value accordingly. if (month < 0 || month > 11) { eyear += ClockMath::floorDivide(month, 12, month); } int32_t julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + ClockMath::floorDivide(8 * eyear + 21, 33); if (month != 0) { julianDay += kPersianNumDays[month]; } return julianDay; } //------------------------------------------------------------------------- // Functions for converting from milliseconds to field values //------------------------------------------------------------------------- int32_t PersianCalendar::handleGetExtendedYear() { int32_t year; if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 } else { year = internalGet(UCAL_YEAR, 1); // Default to year 1 } return year; } /** * Override Calendar to compute several fields specific to the Persian * calendar system. These are: * *
• ERA *
• YEAR *
• MONTH *
• DAY_OF_MONTH *
• DAY_OF_YEAR *
• EXTENDED_YEAR
* * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this * method is called. */ void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) { int32_t year, month, dayOfMonth, dayOfYear; int32_t daysSinceEpoch = julianDay - PERSIAN_EPOCH; year = 1 + ClockMath::floorDivide(33 * daysSinceEpoch + 3, 12053); int32_t farvardin1 = 365 * (year - 1) + ClockMath::floorDivide(8 * year + 21, 33); dayOfYear = (daysSinceEpoch - farvardin1); // 0-based if (dayOfYear < 216) { // Compute 0-based month month = dayOfYear / 31; } else { month = (dayOfYear - 6) / 30; } dayOfMonth = dayOfYear - kPersianNumDays[month] + 1; ++dayOfYear; // Make it 1-based now internalSet(UCAL_ERA, 0); internalSet(UCAL_YEAR, year); internalSet(UCAL_EXTENDED_YEAR, year); internalSet(UCAL_MONTH, month); internalSet(UCAL_DAY_OF_MONTH, dayOfMonth); internalSet(UCAL_DAY_OF_YEAR, dayOfYear); } UBool PersianCalendar::inDaylightTime(UErrorCode& status) const { // copied from GregorianCalendar if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) return FALSE; // Force an update of the state of the Calendar. ((PersianCalendar*)this)->complete(status); // cast away const return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE); } // default century static UDate gSystemDefaultCenturyStart = DBL_MIN; static int32_t gSystemDefaultCenturyStartYear = -1; static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER; UBool PersianCalendar::haveDefaultCentury() const { return TRUE; } static void U_CALLCONV initializeSystemDefaultCentury() { // initialize systemDefaultCentury and systemDefaultCenturyYear based // on the current time. They'll be set to 80 years before // the current time. UErrorCode status = U_ZERO_ERROR; PersianCalendar calendar(Locale("@calendar=persian"),status); if (U_SUCCESS(status)) { calendar.setTime(Calendar::getNow(), status); calendar.add(UCAL_YEAR, -80, status); gSystemDefaultCenturyStart = calendar.getTime(status); gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status); } // We have no recourse upon failure unless we want to propagate the failure // out. } UDate PersianCalendar::defaultCenturyStart() const { // lazy-evaluate systemDefaultCenturyStart umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); return gSystemDefaultCenturyStart; } int32_t PersianCalendar::defaultCenturyStartYear() const { // lazy-evaluate systemDefaultCenturyStartYear umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); return gSystemDefaultCenturyStartYear; } UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar) U_NAMESPACE_END #endif