1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/icu/source/i18n/persncal.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,293 @@
1.4 +/*
1.5 + ******************************************************************************
1.6 + * Copyright (C) 2003-2013, International Business Machines Corporation
1.7 + * and others. All Rights Reserved.
1.8 + ******************************************************************************
1.9 + *
1.10 + * File PERSNCAL.CPP
1.11 + *
1.12 + * Modification History:
1.13 + *
1.14 + * Date Name Description
1.15 + * 9/23/2003 mehran posted to icu-design
1.16 + * 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote
1.17 + * based on the implementation of Gregorian
1.18 + *****************************************************************************
1.19 + */
1.20 +
1.21 +#include "persncal.h"
1.22 +
1.23 +#if !UCONFIG_NO_FORMATTING
1.24 +
1.25 +#include "umutex.h"
1.26 +#include "gregoimp.h" // Math
1.27 +#include <float.h>
1.28 +
1.29 +static const int16_t kPersianNumDays[]
1.30 += {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year
1.31 +static const int8_t kPersianMonthLength[]
1.32 += {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based
1.33 +static const int8_t kPersianLeapMonthLength[]
1.34 += {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based
1.35 +
1.36 +static const int32_t kPersianCalendarLimits[UCAL_FIELD_COUNT][4] = {
1.37 + // Minimum Greatest Least Maximum
1.38 + // Minimum Maximum
1.39 + { 0, 0, 0, 0}, // ERA
1.40 + { -5000000, -5000000, 5000000, 5000000}, // YEAR
1.41 + { 0, 0, 11, 11}, // MONTH
1.42 + { 1, 1, 52, 53}, // WEEK_OF_YEAR
1.43 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
1.44 + { 1, 1, 29, 31}, // DAY_OF_MONTH
1.45 + { 1, 1, 365, 366}, // DAY_OF_YEAR
1.46 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
1.47 + { 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
1.48 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
1.49 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
1.50 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
1.51 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
1.52 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
1.53 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
1.54 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
1.55 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
1.56 + { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
1.57 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
1.58 + { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
1.59 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
1.60 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
1.61 + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
1.62 +};
1.63 +
1.64 +U_NAMESPACE_BEGIN
1.65 +
1.66 +static const int32_t PERSIAN_EPOCH = 1948320;
1.67 +
1.68 +// Implementation of the PersianCalendar class
1.69 +
1.70 +//-------------------------------------------------------------------------
1.71 +// Constructors...
1.72 +//-------------------------------------------------------------------------
1.73 +
1.74 +const char *PersianCalendar::getType() const {
1.75 + return "persian";
1.76 +}
1.77 +
1.78 +Calendar* PersianCalendar::clone() const {
1.79 + return new PersianCalendar(*this);
1.80 +}
1.81 +
1.82 +PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
1.83 + : Calendar(TimeZone::createDefault(), aLocale, success)
1.84 +{
1.85 + setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
1.86 +}
1.87 +
1.88 +PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
1.89 +}
1.90 +
1.91 +PersianCalendar::~PersianCalendar()
1.92 +{
1.93 +}
1.94 +
1.95 +//-------------------------------------------------------------------------
1.96 +// Minimum / Maximum access functions
1.97 +//-------------------------------------------------------------------------
1.98 +
1.99 +
1.100 +int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
1.101 + return kPersianCalendarLimits[field][limitType];
1.102 +}
1.103 +
1.104 +//-------------------------------------------------------------------------
1.105 +// Assorted calculation utilities
1.106 +//
1.107 +
1.108 +/**
1.109 + * Determine whether a year is a leap year in the Persian calendar
1.110 + */
1.111 +UBool PersianCalendar::isLeapYear(int32_t year)
1.112 +{
1.113 + int32_t remainder;
1.114 + ClockMath::floorDivide(25 * year + 11, 33, remainder);
1.115 + return (remainder < 8);
1.116 +}
1.117 +
1.118 +/**
1.119 + * Return the day # on which the given year starts. Days are counted
1.120 + * from the Persian epoch, origin 0.
1.121 + */
1.122 +int32_t PersianCalendar::yearStart(int32_t year) {
1.123 + return handleComputeMonthStart(year,0,FALSE);
1.124 +}
1.125 +
1.126 +/**
1.127 + * Return the day # on which the given month starts. Days are counted
1.128 + * from the Persian epoch, origin 0.
1.129 + *
1.130 + * @param year The Persian year
1.131 + * @param year The Persian month, 0-based
1.132 + */
1.133 +int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
1.134 + return handleComputeMonthStart(year,month,TRUE);
1.135 +}
1.136 +
1.137 +//----------------------------------------------------------------------
1.138 +// Calendar framework
1.139 +//----------------------------------------------------------------------
1.140 +
1.141 +/**
1.142 + * Return the length (in days) of the given month.
1.143 + *
1.144 + * @param year The Persian year
1.145 + * @param year The Persian month, 0-based
1.146 + */
1.147 +int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
1.148 + // If the month is out of range, adjust it into range, and
1.149 + // modify the extended year value accordingly.
1.150 + if (month < 0 || month > 11) {
1.151 + extendedYear += ClockMath::floorDivide(month, 12, month);
1.152 + }
1.153 +
1.154 + return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month];
1.155 +}
1.156 +
1.157 +/**
1.158 + * Return the number of days in the given Persian year
1.159 + */
1.160 +int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
1.161 + return isLeapYear(extendedYear) ? 366 : 365;
1.162 +}
1.163 +
1.164 +//-------------------------------------------------------------------------
1.165 +// Functions for converting from field values to milliseconds....
1.166 +//-------------------------------------------------------------------------
1.167 +
1.168 +// Return JD of start of given month/year
1.169 +int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
1.170 + // If the month is out of range, adjust it into range, and
1.171 + // modify the extended year value accordingly.
1.172 + if (month < 0 || month > 11) {
1.173 + eyear += ClockMath::floorDivide(month, 12, month);
1.174 + }
1.175 +
1.176 + int32_t julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + ClockMath::floorDivide(8 * eyear + 21, 33);
1.177 +
1.178 + if (month != 0) {
1.179 + julianDay += kPersianNumDays[month];
1.180 + }
1.181 +
1.182 + return julianDay;
1.183 +}
1.184 +
1.185 +//-------------------------------------------------------------------------
1.186 +// Functions for converting from milliseconds to field values
1.187 +//-------------------------------------------------------------------------
1.188 +
1.189 +int32_t PersianCalendar::handleGetExtendedYear() {
1.190 + int32_t year;
1.191 + if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
1.192 + year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
1.193 + } else {
1.194 + year = internalGet(UCAL_YEAR, 1); // Default to year 1
1.195 + }
1.196 + return year;
1.197 +}
1.198 +
1.199 +/**
1.200 + * Override Calendar to compute several fields specific to the Persian
1.201 + * calendar system. These are:
1.202 + *
1.203 + * <ul><li>ERA
1.204 + * <li>YEAR
1.205 + * <li>MONTH
1.206 + * <li>DAY_OF_MONTH
1.207 + * <li>DAY_OF_YEAR
1.208 + * <li>EXTENDED_YEAR</ul>
1.209 + *
1.210 + * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
1.211 + * method is called.
1.212 + */
1.213 +void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
1.214 + int32_t year, month, dayOfMonth, dayOfYear;
1.215 +
1.216 + int32_t daysSinceEpoch = julianDay - PERSIAN_EPOCH;
1.217 + year = 1 + ClockMath::floorDivide(33 * daysSinceEpoch + 3, 12053);
1.218 +
1.219 + int32_t farvardin1 = 365 * (year - 1) + ClockMath::floorDivide(8 * year + 21, 33);
1.220 + dayOfYear = (daysSinceEpoch - farvardin1); // 0-based
1.221 + if (dayOfYear < 216) { // Compute 0-based month
1.222 + month = dayOfYear / 31;
1.223 + } else {
1.224 + month = (dayOfYear - 6) / 30;
1.225 + }
1.226 + dayOfMonth = dayOfYear - kPersianNumDays[month] + 1;
1.227 + ++dayOfYear; // Make it 1-based now
1.228 +
1.229 + internalSet(UCAL_ERA, 0);
1.230 + internalSet(UCAL_YEAR, year);
1.231 + internalSet(UCAL_EXTENDED_YEAR, year);
1.232 + internalSet(UCAL_MONTH, month);
1.233 + internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
1.234 + internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
1.235 +}
1.236 +
1.237 +UBool
1.238 +PersianCalendar::inDaylightTime(UErrorCode& status) const
1.239 +{
1.240 + // copied from GregorianCalendar
1.241 + if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
1.242 + return FALSE;
1.243 +
1.244 + // Force an update of the state of the Calendar.
1.245 + ((PersianCalendar*)this)->complete(status); // cast away const
1.246 +
1.247 + return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
1.248 +}
1.249 +
1.250 +// default century
1.251 +
1.252 +static UDate gSystemDefaultCenturyStart = DBL_MIN;
1.253 +static int32_t gSystemDefaultCenturyStartYear = -1;
1.254 +static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
1.255 +
1.256 +UBool PersianCalendar::haveDefaultCentury() const
1.257 +{
1.258 + return TRUE;
1.259 +}
1.260 +
1.261 +static void U_CALLCONV initializeSystemDefaultCentury() {
1.262 + // initialize systemDefaultCentury and systemDefaultCenturyYear based
1.263 + // on the current time. They'll be set to 80 years before
1.264 + // the current time.
1.265 + UErrorCode status = U_ZERO_ERROR;
1.266 + PersianCalendar calendar(Locale("@calendar=persian"),status);
1.267 + if (U_SUCCESS(status))
1.268 + {
1.269 + calendar.setTime(Calendar::getNow(), status);
1.270 + calendar.add(UCAL_YEAR, -80, status);
1.271 +
1.272 + gSystemDefaultCenturyStart = calendar.getTime(status);
1.273 + gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
1.274 + }
1.275 + // We have no recourse upon failure unless we want to propagate the failure
1.276 + // out.
1.277 +}
1.278 +
1.279 +UDate PersianCalendar::defaultCenturyStart() const {
1.280 + // lazy-evaluate systemDefaultCenturyStart
1.281 + umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
1.282 + return gSystemDefaultCenturyStart;
1.283 +}
1.284 +
1.285 +int32_t PersianCalendar::defaultCenturyStartYear() const {
1.286 + // lazy-evaluate systemDefaultCenturyStartYear
1.287 + umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
1.288 + return gSystemDefaultCenturyStartYear;
1.289 +}
1.290 +
1.291 +UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
1.292 +
1.293 +U_NAMESPACE_END
1.294 +
1.295 +#endif
1.296 +
