The Tor Browser: intl/icu/source/i18n/hebrwcal.cpp@6474c204b198 (annotated)

intl/icu/source/i18n/hebrwcal.cpp@6474c204b198 (annotated)

intl/icu/source/i18n/hebrwcal.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
 ******************************************************************************
 * Copyright (C) 2003-2013, International Business Machines Corporation
 * and others. All Rights Reserved.
 ******************************************************************************
 *
 * File HEBRWCAL.CPP
 *
 * Modification History:
 *
 *   Date        Name        Description
 *   12/03/2003  srl         ported from java HebrewCalendar
 *****************************************************************************
 */
 #include "hebrwcal.h"
 #if !UCONFIG_NO_FORMATTING
 #include "umutex.h"
 #include <float.h>
 #include "gregoimp.h" // Math
 #include "astro.h" // CalendarAstronomer
 #include "uhash.h"
 #include "ucln_in.h"
 // Hebrew Calendar implementation
 /**
 * The absolute date, in milliseconds since 1/1/1970 AD, Gregorian,
 * of the start of the Hebrew calendar.  In order to keep this calendar's
 * time of day in sync with that of the Gregorian calendar, we use
 * midnight, rather than sunset the day before.
 */
 //static const double EPOCH_MILLIS = -180799862400000.; // 1/1/1 HY
 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
     // Minimum  Greatest    Least  Maximum
     //           Minimum  Maximum
     {        0,        0,        0,        0}, // ERA
     { -5000000, -5000000,  5000000,  5000000}, // YEAR
     {        0,        0,       12,       12}, // MONTH
     {        1,        1,       51,       56}, // WEEK_OF_YEAR
     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
     {        1,        1,       29,       30}, // DAY_OF_MONTH
     {        1,        1,      353,      385}, // 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
 };
 /**
 * The lengths of the Hebrew months.  This is complicated, because there
 * are three different types of years, or six if you count leap years.
 * Due to the rules for postponing the start of the year to avoid having
 * certain holidays fall on the sabbath, the year can end up being three
 * different lengths, called "deficient", "normal", and "complete".
 */
 static const int8_t MONTH_LENGTH[][3] = {
     // Deficient  Normal     Complete
     {   30,         30,         30     },           //Tishri
     {   29,         29,         30     },           //Heshvan
     {   29,         30,         30     },           //Kislev
     {   29,         29,         29     },           //Tevet
     {   30,         30,         30     },           //Shevat
     {   30,         30,         30     },           //Adar I (leap years only)
     {   29,         29,         29     },           //Adar
     {   30,         30,         30     },           //Nisan
     {   29,         29,         29     },           //Iyar
     {   30,         30,         30     },           //Sivan
     {   29,         29,         29     },           //Tammuz
     {   30,         30,         30     },           //Av
     {   29,         29,         29     },           //Elul
 };
 /**
 * The cumulative # of days to the end of each month in a non-leap year
 * Although this can be calculated from the MONTH_LENGTH table,
 * keeping it around separately makes some calculations a lot faster
 */
 static const int16_t MONTH_START[][3] = {
     // Deficient  Normal     Complete
     {    0,          0,          0  },          // (placeholder)
     {   30,         30,         30  },          // Tishri
     {   59,         59,         60  },          // Heshvan
     {   88,         89,         90  },          // Kislev
     {  117,        118,        119  },          // Tevet
     {  147,        148,        149  },          // Shevat
     {  147,        148,        149  },          // (Adar I placeholder)
     {  176,        177,        178  },          // Adar
     {  206,        207,        208  },          // Nisan
     {  235,        236,        237  },          // Iyar
     {  265,        266,        267  },          // Sivan
     {  294,        295,        296  },          // Tammuz
     {  324,        325,        326  },          // Av
     {  353,        354,        355  },          // Elul
 };
 /**
 * The cumulative # of days to the end of each month in a leap year
 */
 static const int16_t  LEAP_MONTH_START[][3] = {
     // Deficient  Normal     Complete
     {    0,          0,          0  },          // (placeholder)
     {   30,         30,         30  },          // Tishri
     {   59,         59,         60  },          // Heshvan
     {   88,         89,         90  },          // Kislev
     {  117,        118,        119  },          // Tevet
     {  147,        148,        149  },          // Shevat
     {  177,        178,        179  },          // Adar I
     {  206,        207,        208  },          // Adar II
     {  236,        237,        238  },          // Nisan
     {  265,        266,        267  },          // Iyar
     {  295,        296,        297  },          // Sivan
     {  324,        325,        326  },          // Tammuz
     {  354,        355,        356  },          // Av
     {  383,        384,        385  },          // Elul
 };
 static icu::CalendarCache *gCache =  NULL;
 U_CDECL_BEGIN
 static UBool calendar_hebrew_cleanup(void) {
     delete gCache;
     gCache = NULL;
     return TRUE;
 }
 U_CDECL_END
 U_NAMESPACE_BEGIN
 //-------------------------------------------------------------------------
 // Constructors...
 //-------------------------------------------------------------------------
 /**
 * Constructs a default <code>HebrewCalendar</code> using the current time
 * in the default time zone with the default locale.
 * @internal
 */
 HebrewCalendar::HebrewCalendar(const Locale& aLocale, UErrorCode& success)
 :   Calendar(TimeZone::createDefault(), aLocale, success)
 {
     setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
 }
 HebrewCalendar::~HebrewCalendar() {
 }
 const char *HebrewCalendar::getType() const {
     return "hebrew";
 }
 Calendar* HebrewCalendar::clone() const {
     return new HebrewCalendar(*this);
 }
 HebrewCalendar::HebrewCalendar(const HebrewCalendar& other) : Calendar(other) {
 }
 //-------------------------------------------------------------------------
 // Rolling and adding functions overridden from Calendar
 //
 // These methods call through to the default implementation in IBMCalendar
 // for most of the fields and only handle the unusual ones themselves.
 //-------------------------------------------------------------------------
 /**
 * Add a signed amount to a specified field, using this calendar's rules.
 * For example, to add three days to the current date, you can call
 * <code>add(Calendar.DATE, 3)</code>.
 * <p>
 * When adding to certain fields, the values of other fields may conflict and
 * need to be changed.  For example, when adding one to the {@link #MONTH MONTH} field
 * for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
 * must be adjusted so that the result is "29 Elul 5758" rather than the invalid
 * "30 Elul 5758".
 * <p>
 * This method is able to add to
 * all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
 * and {@link #ZONE_OFFSET ZONE_OFFSET}.
 * <p>
 * <b>Note:</b> You should always use {@link #roll roll} and add rather
 * than attempting to perform arithmetic operations directly on the fields
 * of a <tt>HebrewCalendar</tt>.  Since the {@link #MONTH MONTH} field behaves
 * discontinuously in non-leap years, simple arithmetic can give invalid results.
 * <p>
 * @param field     the time field.
 * @param amount    the amount to add to the field.
 *
 * @exception   IllegalArgumentException if the field is invalid or refers
 *              to a field that cannot be handled by this method.
 * @internal
 */
 void HebrewCalendar::add(UCalendarDateFields field, int32_t amount, UErrorCode& status)
 {
     if(U_FAILURE(status)) {
         return;
     }
     switch (field) {
   case UCAL_MONTH:
       {
           // We can't just do a set(MONTH, get(MONTH) + amount).  The
           // reason is ADAR_1.  Suppose amount is +2 and we land in
           // ADAR_1 -- then we have to bump to ADAR_2 aka ADAR.  But
           // if amount is -2 and we land in ADAR_1, then we have to
           // bump the other way -- down to SHEVAT.  - Alan 11/00
           int32_t month = get(UCAL_MONTH, status);
           int32_t year = get(UCAL_YEAR, status);
           UBool acrossAdar1;
           if (amount > 0) {
               acrossAdar1 = (month < ADAR_1); // started before ADAR_1?
               month += amount;
               for (;;) {
                   if (acrossAdar1 && month>=ADAR_1 && !isLeapYear(year)) {
                       ++month;
                   }
                   if (month <= ELUL) {
                       break;
                   }
                   month -= ELUL+1;
                   ++year;
                   acrossAdar1 = TRUE;
               }
           } else {
               acrossAdar1 = (month > ADAR_1); // started after ADAR_1?
               month += amount;
               for (;;) {
                   if (acrossAdar1 && month<=ADAR_1 && !isLeapYear(year)) {
                       --month;
                   }
                   if (month >= 0) {
                       break;
                   }
                   month += ELUL+1;
                   --year;
                   acrossAdar1 = TRUE;
               }
           }
           set(UCAL_MONTH, month);
           set(UCAL_YEAR, year);
           pinField(UCAL_DAY_OF_MONTH, status);
           break;
       }
   default:
       Calendar::add(field, amount, status);
       break;
     }
 }
 /**
 * @deprecated ICU 2.6 use UCalendarDateFields instead of EDateFields
 */
 void HebrewCalendar::add(EDateFields field, int32_t amount, UErrorCode& status)
 {
     add((UCalendarDateFields)field, amount, status);
 }
 /**
 * Rolls (up/down) a specified amount time on the given field.  For
 * example, to roll the current date up by three days, you can call
 * <code>roll(Calendar.DATE, 3)</code>.  If the
 * field is rolled past its maximum allowable value, it will "wrap" back
 * to its minimum and continue rolling.
 * For example, calling <code>roll(Calendar.DATE, 10)</code>
 * on a Hebrew calendar set to "25 Av 5758" will result in the date "5 Av 5758".
 * <p>
 * When rolling certain fields, the values of other fields may conflict and
 * need to be changed.  For example, when rolling the {@link #MONTH MONTH} field
 * upward by one for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
 * must be adjusted so that the result is "29 Elul 5758" rather than the invalid
 * "30 Elul".
 * <p>
 * This method is able to roll
 * all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
 * and {@link #ZONE_OFFSET ZONE_OFFSET}.  Subclasses may, of course, add support for
 * additional fields in their overrides of <code>roll</code>.
 * <p>
 * <b>Note:</b> You should always use roll and {@link #add add} rather
 * than attempting to perform arithmetic operations directly on the fields
 * of a <tt>HebrewCalendar</tt>.  Since the {@link #MONTH MONTH} field behaves
 * discontinuously in non-leap years, simple arithmetic can give invalid results.
 * <p>
 * @param field     the time field.
 * @param amount    the amount by which the field should be rolled.
 *
 * @exception   IllegalArgumentException if the field is invalid or refers
 *              to a field that cannot be handled by this method.
 * @internal
 */
 void HebrewCalendar::roll(UCalendarDateFields field, int32_t amount, UErrorCode& status)
 {
     if(U_FAILURE(status)) {
         return;
     }
     switch (field) {
   case UCAL_MONTH:
       {
           int32_t month = get(UCAL_MONTH, status);
           int32_t year = get(UCAL_YEAR, status);
           UBool leapYear = isLeapYear(year);
           int32_t yearLength = monthsInYear(year);
           int32_t newMonth = month + (amount % yearLength);
           //
           // If it's not a leap year and we're rolling past the missing month
           // of ADAR_1, we need to roll an extra month to make up for it.
           //
           if (!leapYear) {
               if (amount > 0 && month < ADAR_1 && newMonth >= ADAR_1) {
                   newMonth++;
               } else if (amount < 0 && month > ADAR_1 && newMonth <= ADAR_1) {
                   newMonth--;
               }
           }
           set(UCAL_MONTH, (newMonth + 13) % 13);
           pinField(UCAL_DAY_OF_MONTH, status);
           return;
       }
   default:
       Calendar::roll(field, amount, status);
     }
 }
 void HebrewCalendar::roll(EDateFields field, int32_t amount, UErrorCode& status) {
     roll((UCalendarDateFields)field, amount, status);
 }
 //-------------------------------------------------------------------------
 // Support methods
 //-------------------------------------------------------------------------
 // Hebrew date calculations are performed in terms of days, hours, and
 // "parts" (or halakim), which are 1/1080 of an hour, or 3 1/3 seconds.
 static const int32_t HOUR_PARTS = 1080;
 static const int32_t DAY_PARTS  = 24*HOUR_PARTS;
 // An approximate value for the length of a lunar month.
 // It is used to calculate the approximate year and month of a given
 // absolute date.
 static const int32_t  MONTH_DAYS = 29;
 static const int32_t MONTH_FRACT = 12*HOUR_PARTS + 793;
 static const int32_t MONTH_PARTS = MONTH_DAYS*DAY_PARTS + MONTH_FRACT;
 // The time of the new moon (in parts) on 1 Tishri, year 1 (the epoch)
 // counting from noon on the day before.  BAHARAD is an abbreviation of
 // Bet (Monday), Hey (5 hours from sunset), Resh-Daled (204).
 static const int32_t BAHARAD = 11*HOUR_PARTS + 204;
 /**
 * Finds the day # of the first day in the given Hebrew year.
 * To do this, we want to calculate the time of the Tishri 1 new moon
 * in that year.
 * <p>
 * The algorithm here is similar to ones described in a number of
 * references, including:
 * <ul>
 * <li>"Calendrical Calculations", by Nachum Dershowitz & Edward Reingold,
 *     Cambridge University Press, 1997, pages 85-91.
 *
 * <li>Hebrew Calendar Science and Myths,
 *     <a href="http://www.geocities.com/Athens/1584/">
 *     http://www.geocities.com/Athens/1584/</a>
 *
 * <li>The Calendar FAQ,
 *      <a href="http://www.faqs.org/faqs/calendars/faq/">
 *      http://www.faqs.org/faqs/calendars/faq/</a>
 * </ul>
 */
 int32_t HebrewCalendar::startOfYear(int32_t year, UErrorCode &status)
 {
     ucln_i18n_registerCleanup(UCLN_I18N_HEBREW_CALENDAR, calendar_hebrew_cleanup);
     int32_t day = CalendarCache::get(&gCache, year, status);
     if (day == 0) {
         int32_t months = (235 * year - 234) / 19;           // # of months before year
         int64_t frac = (int64_t)months * MONTH_FRACT + BAHARAD;  // Fractional part of day #
         day  = months * 29 + (int32_t)(frac / DAY_PARTS);        // Whole # part of calculation
         frac = frac % DAY_PARTS;                        // Time of day
         int32_t wd = (day % 7);                        // Day of week (0 == Monday)
         if (wd == 2 || wd == 4 || wd == 6) {
             // If the 1st is on Sun, Wed, or Fri, postpone to the next day
             day += 1;
             wd = (day % 7);
         }
         if (wd == 1 && frac > 15*HOUR_PARTS+204 && !isLeapYear(year) ) {
             // If the new moon falls after 3:11:20am (15h204p from the previous noon)
             // on a Tuesday and it is not a leap year, postpone by 2 days.
             // This prevents 356-day years.
             day += 2;
         }
         else if (wd == 0 && frac > 21*HOUR_PARTS+589 && isLeapYear(year-1) ) {
             // If the new moon falls after 9:32:43 1/3am (21h589p from yesterday noon)
             // on a Monday and *last* year was a leap year, postpone by 1 day.
             // Prevents 382-day years.
             day += 1;
         }
         CalendarCache::put(&gCache, year, day, status);
     }
     return day;
 }
 /**
 * Find the day of the week for a given day
 *
 * @param day   The # of days since the start of the Hebrew calendar,
 *              1-based (i.e. 1/1/1 AM is day 1).
 */
 int32_t HebrewCalendar::absoluteDayToDayOfWeek(int32_t day)
 {
     // We know that 1/1/1 AM is a Monday, which makes the math easy...
     return (day % 7) + 1;
 }
 /**
 * Returns the the type of a given year.
 *  0   "Deficient" year with 353 or 383 days
 *  1   "Normal"    year with 354 or 384 days
 *  2   "Complete"  year with 355 or 385 days
 */
 int32_t HebrewCalendar::yearType(int32_t year) const
 {
     int32_t yearLength = handleGetYearLength(year);
     if (yearLength > 380) {
         yearLength -= 30;        // Subtract length of leap month.
     }
     int type = 0;
     switch (yearLength) {
   case 353:
       type = 0; break;
   case 354:
       type = 1; break;
   case 355:
       type = 2; break;
   default:
       //throw new RuntimeException("Illegal year length " + yearLength + " in year " + year);
       type = 1;
     }
     return type;
 }
 /**
 * Determine whether a given Hebrew year is a leap year
 *
 * The rule here is that if (year % 19) == 0, 3, 6, 8, 11, 14, or 17.
 * The formula below performs the same test, believe it or not.
 */
 UBool HebrewCalendar::isLeapYear(int32_t year) {
     //return (year * 12 + 17) % 19 >= 12;
     int32_t x = (year*12 + 17) % 19;
     return x >= ((x < 0) ? -7 : 12);
 }
 int32_t HebrewCalendar::monthsInYear(int32_t year) {
     return isLeapYear(year) ? 13 : 12;
 }
 //-------------------------------------------------------------------------
 // Calendar framework
 //-------------------------------------------------------------------------
 /**
 * @internal
 */
 int32_t HebrewCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
     return LIMITS[field][limitType];
 }
 /**
 * Returns the length of the given month in the given year
 * @internal
 */
 int32_t HebrewCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
     // Resolve out-of-range months.  This is necessary in order to
     // obtain the correct year.  We correct to
     // a 12- or 13-month year (add/subtract 12 or 13, depending
     // on the year) but since we _always_ number from 0..12, and
     // the leap year determines whether or not month 5 (Adar 1)
     // is present, we allow 0..12 in any given year.
     while (month < 0) {
         month += monthsInYear(--extendedYear);
     }
     // Careful: allow 0..12 in all years
     while (month > 12) {
         month -= monthsInYear(extendedYear++);
     }
     switch (month) {
     case HESHVAN:
     case KISLEV:
       // These two month lengths can vary
       return MONTH_LENGTH[month][yearType(extendedYear)];
     default:
       // The rest are a fixed length
       return MONTH_LENGTH[month][0];
     }
 }
 /**
 * Returns the number of days in the given Hebrew year
 * @internal
 */
 int32_t HebrewCalendar::handleGetYearLength(int32_t eyear) const {
     UErrorCode status = U_ZERO_ERROR;
     return startOfYear(eyear+1, status) - startOfYear(eyear, status);
 }
 //-------------------------------------------------------------------------
 // Functions for converting from milliseconds to field values
 //-------------------------------------------------------------------------
 /**
 * Subclasses may override this method to compute several fields
 * specific to each calendar system.  These are:
 *
 * <ul><li>ERA
 * <li>YEAR
 * <li>MONTH
 * <li>DAY_OF_MONTH
 * <li>DAY_OF_YEAR
 * <li>EXTENDED_YEAR</ul>
 *
 * Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields,
 * which will be set when this method is called.  Subclasses can
 * also call the getGregorianXxx() methods to obtain Gregorian
 * calendar equivalents for the given Julian day.
 *
 * <p>In addition, subclasses should compute any subclass-specific
 * fields, that is, fields from BASE_FIELD_COUNT to
 * getFieldCount() - 1.
 * @internal
 */
 void HebrewCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) {
     int32_t d = julianDay - 347997;
     double m = ((d * (double)DAY_PARTS)/ (double) MONTH_PARTS);         // Months (approx)
     int32_t year = (int32_t)( ((19. * m + 234.) / 235.) + 1.);     // Years (approx)
     int32_t ys  = startOfYear(year, status);                   // 1st day of year
     int32_t dayOfYear = (d - ys);
     // Because of the postponement rules, it's possible to guess wrong.  Fix it.
     while (dayOfYear < 1) {
         year--;
         ys  = startOfYear(year, status);
         dayOfYear = (d - ys);
     }
     // Now figure out which month we're in, and the date within that month
     int32_t type = yearType(year);
     UBool isLeap = isLeapYear(year);
     int32_t month = 0;
     int32_t momax = sizeof(MONTH_START) / (3 * sizeof(MONTH_START[0][0]));
     while (month < momax && dayOfYear > (  isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type] ) ) {
         month++;
     }
     if (month >= momax || month<=0) {
         // TODO: I found dayOfYear could be out of range when
         // a large value is set to julianDay.  I patched startOfYear
         // to reduce the chace, but it could be still reproduced either
         // by startOfYear or other places.  For now, we check
         // the month is in valid range to avoid out of array index
         // access problem here.  However, we need to carefully review
         // the calendar implementation to check the extreme limit of
         // each calendar field and the code works well for any values
         // in the valid value range.  -yoshito
         status = U_ILLEGAL_ARGUMENT_ERROR;
         return;
     }
     month--;
     int dayOfMonth = dayOfYear - (isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type]);
     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);
 }
 //-------------------------------------------------------------------------
 // Functions for converting from field values to milliseconds
 //-------------------------------------------------------------------------
 /**
 * @internal
 */
 int32_t HebrewCalendar::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;
 }
 /**
 * Return JD of start of given month/year.
 * @internal
 */
 int32_t HebrewCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
     UErrorCode status = U_ZERO_ERROR;
     // Resolve out-of-range months.  This is necessary in order to
     // obtain the correct year.  We correct to
     // a 12- or 13-month year (add/subtract 12 or 13, depending
     // on the year) but since we _always_ number from 0..12, and
     // the leap year determines whether or not month 5 (Adar 1)
     // is present, we allow 0..12 in any given year.
     while (month < 0) {
         month += monthsInYear(--eyear);
     }
     // Careful: allow 0..12 in all years
     while (month > 12) {
         month -= monthsInYear(eyear++);
     }
     int32_t day = startOfYear(eyear, status);
     if(U_FAILURE(status)) {
         return 0;
     }
     if (month != 0) {
         if (isLeapYear(eyear)) {
             day += LEAP_MONTH_START[month][yearType(eyear)];
         } else {
             day += MONTH_START[month][yearType(eyear)];
         }
     }
     return (int) (day + 347997);
 }
 UBool
 HebrewCalendar::inDaylightTime(UErrorCode& status) const
 {
     // copied from GregorianCalendar
     if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
         return FALSE;
     // Force an update of the state of the Calendar.
     ((HebrewCalendar*)this)->complete(status); // cast away const
     return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
 }
 /**
  * The system maintains a static default century start date and Year.  They are
  * initialized the first time they are used.  Once the system default century date
  * and year are set, they do not change.
  */
 static UDate           gSystemDefaultCenturyStart       = DBL_MIN;
 static int32_t         gSystemDefaultCenturyStartYear   = -1;
 static icu::UInitOnce  gSystemDefaultCenturyInit        = U_INITONCE_INITIALIZER;
 UBool HebrewCalendar::haveDefaultCentury() const
 {
     return TRUE;
 }
 static void U_CALLCONV 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;
     HebrewCalendar calendar(Locale("@calendar=hebrew"),status);
     if (U_SUCCESS(status)) {
         calendar.setTime(Calendar::getNow(), status);
         calendar.add(UCAL_YEAR, -80, status);
         gSystemDefaultCenturyStart = calendar.getTime(status);
         gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
     }
     // We have no recourse upon failure unless we want to propagate the failure
     // out.
 }
 UDate HebrewCalendar::defaultCenturyStart() const {
     // lazy-evaluate systemDefaultCenturyStart
     umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
     return gSystemDefaultCenturyStart;
 }
 int32_t HebrewCalendar::defaultCenturyStartYear() const {
     // lazy-evaluate systemDefaultCenturyStartYear
     umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
     return gSystemDefaultCenturyStartYear;
 }
 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HebrewCalendar)
 U_NAMESPACE_END
 #endif // UCONFIG_NO_FORMATTING

The Tor Browser / annotate

intl/icu/source/i18n/hebrwcal.cpp@6474c204b198 (annotated)

intl/icu/source/i18n/hebrwcal.cpp