// © 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 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 }; 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) { 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) { int64_t y = static_cast(year) * 25LL + 11LL; return (y % 33L < 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, 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) const { return isLeapYear(extendedYear) ? 366 : 365; } //------------------------------------------------------------------------- // Functions for converting from field values to milliseconds.... //------------------------------------------------------------------------- // 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 + 365LL * (eyear - 1LL) + ClockMath::floorDivide(8LL * eyear + 21, 33); 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 - 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 = 365LL * (year - 1) + ClockMath::floorDivide(8LL * year + 21, 33); int32_t dayOfYear = daysSinceEpoch - farvardin1; // 0-based U_ASSERT(dayOfYear >= 0); U_ASSERT(dayOfYear < 366); // 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); int32_t dayOfMonth = dayOfYear - kPersianNumDays[month] + 1; U_ASSERT(dayOfMonth > 0); U_ASSERT(dayOfMonth <= 31); ++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_ORDINAL_MONTH, month); internalSet(UCAL_DAY_OF_MONTH, dayOfMonth); internalSet(UCAL_DAY_OF_YEAR, dayOfYear); } constexpr uint32_t kPersianRelatedYearDiff = 622; int32_t PersianCalendar::getRelatedYear(UErrorCode &status) const { int32_t year = get(UCAL_EXTENDED_YEAR, status); if (U_FAILURE(status)) { return 0; } if (uprv_add32_overflow(year, kPersianRelatedYearDiff, &year)) { status = U_ILLEGAL_ARGUMENT_ERROR; return 0; } return year; } void PersianCalendar::setRelatedYear(int32_t year) { // set extended year set(UCAL_EXTENDED_YEAR, year - kPersianRelatedYearDiff); } IMPL_SYSTEM_DEFAULT_CENTURY(PersianCalendar, "@calendar=persian") UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar) U_NAMESPACE_END #endif