// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ****************************************************************************** * 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 "uassert.h" #include "umutex.h" #include "gregoimp.h" // Math #include #include "cmemory.h" #include "ucln_in.h" #include "unicode/uniset.h" 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 { 0, 0, 11, 11}, // ORDINAL_MONTH }; namespace { // anonymous static const icu::UnicodeSet *gLeapCorrection = nullptr; static icu::UInitOnce gCorrectionInitOnce {}; static int32_t gMinCorrection; } // namespace U_CDECL_BEGIN static UBool calendar_persian_cleanup() { if (gLeapCorrection) { delete gLeapCorrection; gLeapCorrection = nullptr; } gCorrectionInitOnce.reset(); return true; } U_CDECL_END namespace { // anonymous static void U_CALLCONV initLeapCorrection() { static int16_t nonLeapYears[] = { 1502, 1601, 1634, 1667, 1700, 1733, 1766, 1799, 1832, 1865, 1898, 1931, 1964, 1997, 2030, 2059, 2063, 2096, 2129, 2158, 2162, 2191, 2195, 2224, 2228, 2257, 2261, 2290, 2294, 2323, 2327, 2356, 2360, 2389, 2393, 2422, 2426, 2455, 2459, 2488, 2492, 2521, 2525, 2554, 2558, 2587, 2591, 2620, 2624, 2653, 2657, 2686, 2690, 2719, 2723, 2748, 2752, 2756, 2781, 2785, 2789, 2818, 2822, 2847, 2851, 2855, 2880, 2884, 2888, 2913, 2917, 2921, 2946, 2950, 2954, 2979, 2983, 2987, }; gMinCorrection = nonLeapYears[0]; icu::UnicodeSet prefab; for (auto year : nonLeapYears) { prefab.add(year); } gLeapCorrection = prefab.cloneAsThawed()->freeze(); ucln_i18n_registerCleanup(UCLN_I18N_PERSIAN_CALENDAR, calendar_persian_cleanup); } const icu::UnicodeSet* getLeapCorrection() { umtx_initOnce(gCorrectionInitOnce, &initLeapCorrection); return gLeapCorrection; } } // namespace anonymous U_NAMESPACE_BEGIN static const int32_t PERSIAN_EPOCH = 1948320; // Implementation of the PersianCalendar class //------------------------------------------------------------------------- // Constructors... //------------------------------------------------------------------------- const char *PersianCalendar::getType() const { return "persian"; } PersianCalendar* PersianCalendar::clone() const { return new PersianCalendar(*this); } PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success) : Calendar(TimeZone::forLocaleOrDefault(aLocale), aLocale, success) { } 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) { if (year >= gMinCorrection && getLeapCorrection()->contains(year)) { return false; } if (year > gMinCorrection && getLeapCorrection()->contains(year-1)) { return true; } int64_t y = static_cast(year) * 25LL + 11LL; bool res = (y % 33L < 8); return res; } /** * 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, UErrorCode& status) { return handleComputeMonthStart(year,0,false, status); } /** * 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, UErrorCode& status) const { return handleComputeMonthStart(year,month,true, status); } //---------------------------------------------------------------------- // 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, UErrorCode& /*status*/) 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, UErrorCode& status) const { if (U_FAILURE(status)) return 0; return isLeapYear(extendedYear) ? 366 : 365; } //------------------------------------------------------------------------- // Functions for converting from field values to milliseconds.... //------------------------------------------------------------------------- static int64_t firstJulianOfYear(int64_t year) { int64_t julianDay = 365LL * (year - 1LL) + ClockMath::floorDivide(8LL * year + 21, 33); if (year > gMinCorrection && getLeapCorrection()->contains(year-1)) { julianDay--; } return julianDay; } // Return JD of start of given month/year int64_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/, UErrorCode& status) const { if (U_FAILURE(status)) { return 0; } // If the month is out of range, adjust it into range, and // modify the extended year value accordingly. if (month < 0 || month > 11) { if (uprv_add32_overflow(eyear, ClockMath::floorDivide(month, 12, &month), &eyear)) { status = U_ILLEGAL_ARGUMENT_ERROR; return 0; } } int64_t julianDay = PERSIAN_EPOCH - 1LL + firstJulianOfYear(eyear); if (month != 0) { julianDay += kPersianNumDays[month]; } return julianDay; } //------------------------------------------------------------------------- // Functions for converting from milliseconds to field values //------------------------------------------------------------------------- int32_t PersianCalendar::handleGetExtendedYear(UErrorCode& status) { if (U_FAILURE(status)) { return 0; } if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { return internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 } return internalGet(UCAL_YEAR, 1); // Default to year 1 } /** * Override Calendar to compute several fields specific to the Persian * calendar system. These are: * * * * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this * method is called. */ void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& status) { int64_t daysSinceEpoch = julianDay; daysSinceEpoch -= PERSIAN_EPOCH; int64_t year = ClockMath::floorDivideInt64( 33LL * daysSinceEpoch + 3LL, 12053LL) + 1LL; if (year > INT32_MAX || year < INT32_MIN) { status = U_ILLEGAL_ARGUMENT_ERROR; return; } int64_t farvardin1 = firstJulianOfYear(year); int32_t dayOfYear = daysSinceEpoch - farvardin1; // 0-based U_ASSERT(dayOfYear >= 0); U_ASSERT(dayOfYear < 366); if (dayOfYear == 365 && year >= gMinCorrection && getLeapCorrection()->contains(year)) { year++; dayOfYear = 0; } int32_t month; if (dayOfYear < 216) { // Compute 0-based month month = dayOfYear / 31; } else { month = (dayOfYear - 6) / 30; } U_ASSERT(month >= 0); U_ASSERT(month < 12); ++dayOfYear; // Make it 1-based now int32_t dayOfMonth = dayOfYear - kPersianNumDays[month]; U_ASSERT(dayOfMonth > 0); U_ASSERT(dayOfMonth <= 31); internalSet(UCAL_ERA, 0); internalSet(UCAL_YEAR, year); internalSet(UCAL_EXTENDED_YEAR, year); internalSet(UCAL_MONTH, month); internalSet(UCAL_ORDINAL_MONTH, month); internalSet(UCAL_DAY_OF_MONTH, dayOfMonth); internalSet(UCAL_DAY_OF_YEAR, dayOfYear); } IMPL_SYSTEM_DEFAULT_CENTURY(PersianCalendar, "@calendar=persian") UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar) int32_t PersianCalendar::getRelatedYearDifference() const { constexpr int32_t kPersianCalendarRelatedYearDifference = 622; return kPersianCalendarRelatedYearDifference; } U_NAMESPACE_END #endif