1 // 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /* 4 ****************************************************************************** 5 * Copyright (C) 2003-2013, International Business Machines Corporation 6 * and others. All Rights Reserved. 7 ****************************************************************************** 8 * 9 * File PERSNCAL.CPP 10 * 11 * Modification History: 12 * 13 * Date Name Description 14 * 9/23/2003 mehran posted to icu-design 15 * 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote 16 * based on the implementation of Gregorian 17 ***************************************************************************** 18 */ 19 20 #include "persncal.h" 21 22 #if !UCONFIG_NO_FORMATTING 23 24 #include "umutex.h" 25 #include "gregoimp.h" // Math 26 #include <float.h> 27 28 static const int16_t kPersianNumDays[] 29 = {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year 30 static const int8_t kPersianMonthLength[] 31 = {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based 32 static const int8_t kPersianLeapMonthLength[] 33 = {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based 34 35 static const int32_t kPersianCalendarLimits[UCAL_FIELD_COUNT][4] = { 36 // Minimum Greatest Least Maximum 37 // Minimum Maximum 38 { 0, 0, 0, 0}, // ERA 39 { -5000000, -5000000, 5000000, 5000000}, // YEAR 40 { 0, 0, 11, 11}, // MONTH 41 { 1, 1, 52, 53}, // WEEK_OF_YEAR 42 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH 43 { 1, 1, 29, 31}, // DAY_OF_MONTH 44 { 1, 1, 365, 366}, // DAY_OF_YEAR 45 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK 46 { 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH 47 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM 48 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR 49 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY 50 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE 51 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND 52 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND 53 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET 54 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET 55 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY 56 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL 57 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR 58 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY 59 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY 60 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH 61 }; 62 63 U_NAMESPACE_BEGIN 64 65 static const int32_t PERSIAN_EPOCH = 1948320; 66 67 // Implementation of the PersianCalendar class 68 69 //------------------------------------------------------------------------- 70 // Constructors... 71 //------------------------------------------------------------------------- 72 73 const char *PersianCalendar::getType() const { 74 return "persian"; 75 } 76 77 Calendar* PersianCalendar::clone() const { 78 return new PersianCalendar(*this); 79 } 80 81 PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success) 82 : Calendar(TimeZone::createDefault(), aLocale, success) 83 { 84 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly. 85 } 86 87 PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) { 88 } 89 90 PersianCalendar::~PersianCalendar() 91 { 92 } 93 94 //------------------------------------------------------------------------- 95 // Minimum / Maximum access functions 96 //------------------------------------------------------------------------- 97 98 99 int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const { 100 return kPersianCalendarLimits[field][limitType]; 101 } 102 103 //------------------------------------------------------------------------- 104 // Assorted calculation utilities 105 // 106 107 /** 108 * Determine whether a year is a leap year in the Persian calendar 109 */ 110 UBool PersianCalendar::isLeapYear(int32_t year) 111 { 112 int32_t remainder; 113 ClockMath::floorDivide(25 * year + 11, 33, remainder); 114 return (remainder < 8); 115 } 116 117 /** 118 * Return the day # on which the given year starts. Days are counted 119 * from the Persian epoch, origin 0. 120 */ 121 int32_t PersianCalendar::yearStart(int32_t year) { 122 return handleComputeMonthStart(year,0,FALSE); 123 } 124 125 /** 126 * Return the day # on which the given month starts. Days are counted 127 * from the Persian epoch, origin 0. 128 * 129 * @param year The Persian year 130 * @param year The Persian month, 0-based 131 */ 132 int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const { 133 return handleComputeMonthStart(year,month,TRUE); 134 } 135 136 //---------------------------------------------------------------------- 137 // Calendar framework 138 //---------------------------------------------------------------------- 139 140 /** 141 * Return the length (in days) of the given month. 142 * 143 * @param year The Persian year 144 * @param year The Persian month, 0-based 145 */ 146 int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const { 147 // If the month is out of range, adjust it into range, and 148 // modify the extended year value accordingly. 149 if (month < 0 || month > 11) { 150 extendedYear += ClockMath::floorDivide(month, 12, month); 151 } 152 153 return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month]; 154 } 155 156 /** 157 * Return the number of days in the given Persian year 158 */ 159 int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const { 160 return isLeapYear(extendedYear) ? 366 : 365; 161 } 162 163 //------------------------------------------------------------------------- 164 // Functions for converting from field values to milliseconds.... 165 //------------------------------------------------------------------------- 166 167 // Return JD of start of given month/year 168 int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const { 169 // If the month is out of range, adjust it into range, and 170 // modify the extended year value accordingly. 171 if (month < 0 || month > 11) { 172 eyear += ClockMath::floorDivide(month, 12, month); 173 } 174 175 int32_t julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + ClockMath::floorDivide(8 * eyear + 21, 33); 176 177 if (month != 0) { 178 julianDay += kPersianNumDays[month]; 179 } 180 181 return julianDay; 182 } 183 184 //------------------------------------------------------------------------- 185 // Functions for converting from milliseconds to field values 186 //------------------------------------------------------------------------- 187 188 int32_t PersianCalendar::handleGetExtendedYear() { 189 int32_t year; 190 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { 191 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 192 } else { 193 year = internalGet(UCAL_YEAR, 1); // Default to year 1 194 } 195 return year; 196 } 197 198 /** 199 * Override Calendar to compute several fields specific to the Persian 200 * calendar system. These are: 201 * 202 * <ul><li>ERA 203 * <li>YEAR 204 * <li>MONTH 205 * <li>DAY_OF_MONTH 206 * <li>DAY_OF_YEAR 207 * <li>EXTENDED_YEAR</ul> 208 * 209 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this 210 * method is called. 211 */ 212 void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) { 213 int32_t year, month, dayOfMonth, dayOfYear; 214 215 int32_t daysSinceEpoch = julianDay - PERSIAN_EPOCH; 216 year = 1 + (int32_t)ClockMath::floorDivide(33 * (int64_t)daysSinceEpoch + 3, (int64_t)12053); 217 218 int32_t farvardin1 = 365 * (year - 1) + ClockMath::floorDivide(8 * year + 21, 33); 219 dayOfYear = (daysSinceEpoch - farvardin1); // 0-based 220 if (dayOfYear < 216) { // Compute 0-based month 221 month = dayOfYear / 31; 222 } else { 223 month = (dayOfYear - 6) / 30; 224 } 225 dayOfMonth = dayOfYear - kPersianNumDays[month] + 1; 226 ++dayOfYear; // Make it 1-based now 227 228 internalSet(UCAL_ERA, 0); 229 internalSet(UCAL_YEAR, year); 230 internalSet(UCAL_EXTENDED_YEAR, year); 231 internalSet(UCAL_MONTH, month); 232 internalSet(UCAL_DAY_OF_MONTH, dayOfMonth); 233 internalSet(UCAL_DAY_OF_YEAR, dayOfYear); 234 } 235 236 UBool 237 PersianCalendar::inDaylightTime(UErrorCode& status) const 238 { 239 // copied from GregorianCalendar 240 if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) 241 return FALSE; 242 243 // Force an update of the state of the Calendar. 244 ((PersianCalendar*)this)->complete(status); // cast away const 245 246 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE); 247 } 248 249 // default century 250 251 static UDate gSystemDefaultCenturyStart = DBL_MIN; 252 static int32_t gSystemDefaultCenturyStartYear = -1; 253 static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER; 254 255 UBool PersianCalendar::haveDefaultCentury() const 256 { 257 return TRUE; 258 } 259 260 static void U_CALLCONV initializeSystemDefaultCentury() { 261 // initialize systemDefaultCentury and systemDefaultCenturyYear based 262 // on the current time. They'll be set to 80 years before 263 // the current time. 264 UErrorCode status = U_ZERO_ERROR; 265 PersianCalendar calendar(Locale("@calendar=persian"),status); 266 if (U_SUCCESS(status)) 267 { 268 calendar.setTime(Calendar::getNow(), status); 269 calendar.add(UCAL_YEAR, -80, status); 270 271 gSystemDefaultCenturyStart = calendar.getTime(status); 272 gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status); 273 } 274 // We have no recourse upon failure unless we want to propagate the failure 275 // out. 276 } 277 278 UDate PersianCalendar::defaultCenturyStart() const { 279 // lazy-evaluate systemDefaultCenturyStart 280 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); 281 return gSystemDefaultCenturyStart; 282 } 283 284 int32_t PersianCalendar::defaultCenturyStartYear() const { 285 // lazy-evaluate systemDefaultCenturyStartYear 286 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); 287 return gSystemDefaultCenturyStartYear; 288 } 289 290 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar) 291 292 U_NAMESPACE_END 293 294 #endif 295 296
