DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (31ec81b5d7bb)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
/*
 ******************************************************************************
 * Copyright (C) 2003-2012, 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 <float.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
};

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:
 *
 * <ul><li>ERA
 * <li>YEAR
 * <li>MONTH
 * <li>DAY_OF_MONTH
 * <li>DAY_OF_YEAR
 * <li>EXTENDED_YEAR</ul>
 * 
 * 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
const UDate     PersianCalendar::fgSystemDefaultCentury        = DBL_MIN;
const int32_t   PersianCalendar::fgSystemDefaultCenturyYear    = -1;

UDate           PersianCalendar::fgSystemDefaultCenturyStart       = DBL_MIN;
int32_t         PersianCalendar::fgSystemDefaultCenturyStartYear   = -1;

UBool PersianCalendar::haveDefaultCentury() const
{
    return TRUE;
}

UDate PersianCalendar::defaultCenturyStart() const
{
    return internalGetDefaultCenturyStart();
}

int32_t PersianCalendar::defaultCenturyStartYear() const
{
    return internalGetDefaultCenturyStartYear();
}

UDate
PersianCalendar::internalGetDefaultCenturyStart() const
{
    // lazy-evaluate systemDefaultCenturyStart
    UBool needsUpdate;
    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);

    if (needsUpdate) {
        initializeSystemDefaultCentury();
    }

    // use defaultCenturyStart unless it's the flag value;
    // then use systemDefaultCenturyStart

    return fgSystemDefaultCenturyStart;
}

int32_t
PersianCalendar::internalGetDefaultCenturyStartYear() const
{
    // lazy-evaluate systemDefaultCenturyStartYear
    UBool needsUpdate;
    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);

    if (needsUpdate) {
        initializeSystemDefaultCentury();
    }

    // use defaultCenturyStart unless it's the flag value;
    // then use systemDefaultCenturyStartYear

    return    fgSystemDefaultCenturyStartYear;
}

void
PersianCalendar::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);
        UDate    newStart =  calendar.getTime(status);
        int32_t  newYear  =  calendar.get(UCAL_YEAR, status);
        umtx_lock(NULL);
        if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
        {
            fgSystemDefaultCenturyStartYear = newYear;
            fgSystemDefaultCenturyStart = newStart;
        }
        umtx_unlock(NULL);
    }
    // We have no recourse upon failure unless we want to propagate the failure
    // out.
}

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)

U_NAMESPACE_END

#endif