The Tor Browser: intl/icu/source/i18n/indiancal.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/indiancal.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/indiancal.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  * Copyright (C) 2003-2009, International Business Machines Corporation
  * and others. All Rights Reserved.
  ******************************************************************************
  *
  * File INDIANCAL.CPP
  *****************************************************************************
  */
 #include "indiancal.h"
 #include <stdlib.h>
 #if !UCONFIG_NO_FORMATTING
 #include "mutex.h"
 #include <float.h>
 #include "gregoimp.h" // Math
 #include "astro.h" // CalendarAstronomer
 #include "uhash.h"
 #include "ucln_in.h"
 // Debugging
 #ifdef U_DEBUG_INDIANCAL
 #include <stdio.h>
 #include <stdarg.h>
 #endif
 U_NAMESPACE_BEGIN
 // Implementation of the IndianCalendar class
 //-------------------------------------------------------------------------
 // Constructors...
 //-------------------------------------------------------------------------
 Calendar* IndianCalendar::clone() const {
   return new IndianCalendar(*this);
 }
 IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success)
   :   Calendar(TimeZone::createDefault(), aLocale, success)
 {
   setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
 }
 IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
 }
 IndianCalendar::~IndianCalendar()
 {
 }
 const char *IndianCalendar::getType() const {
    return "indian";
 }
 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,       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,       30,       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
 };
 static const double JULIAN_EPOCH = 1721425.5;
 static const int32_t INDIAN_ERA_START  = 78;
 static const int32_t INDIAN_YEAR_START = 80;
 int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
   return LIMITS[field][limitType];
 }
 /*
  * Determine whether the given gregorian year is a Leap year
  */
 static UBool isGregorianLeap(int32_t year)
 {
     return ((year % 4) == 0) && (!(((year % 100) == 0) && ((year % 400) != 0)));
 }
 //----------------------------------------------------------------------
 // Calendar framework
 //----------------------------------------------------------------------
 /*
  * Return the length (in days) of the given month.
  *
  * @param eyear  The year in Saka Era
  * @param month  The month(0-based) in Indian calendar
  */
 int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const {
    if (month < 0 || month > 11) {
       eyear += ClockMath::floorDivide(month, 12, month);
    }
    if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) {
        return 31;
    }
    if (month >= 1 && month <= 5) {
        return 31;
    }
    return 30;
 }
 /*
  * Return the number of days in the given Indian year
  *
  * @param eyear The year in Saka Era.
  */
 int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const {
     return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365;
 }
 /*
  * Returns the Julian Day corresponding to gregorian date
  *
  * @param year The Gregorian year
  * @param month The month in Gregorian Year
  * @param date The date in Gregorian day in month
  */
 static double gregorianToJD(int32_t year, int32_t month, int32_t date) {
    double julianDay = (JULIAN_EPOCH - 1) +
       (365 * (year - 1)) +
       uprv_floor((year - 1) / 4) +
       (-uprv_floor((year - 1) / 100)) +
       uprv_floor((year - 1) / 400) +
       uprv_floor((((367 * month) - 362) / 12) +
             ((month <= 2) ? 0 :
              (isGregorianLeap(year) ? -1 : -2)
             ) +
             date);
    return julianDay;
 }
 /*
  * Returns the Gregorian Date corresponding to a given Julian Day
  * @param jd The Julian Day
  */
 static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) {
    double wjd, depoch, quadricent, dqc, cent, dcent, quad, dquad, yindex, yearday, leapadj;
    int32_t year, month, day;
    wjd = uprv_floor(jd - 0.5) + 0.5;
    depoch = wjd - JULIAN_EPOCH;
    quadricent = uprv_floor(depoch / 146097);
    dqc = (int32_t)uprv_floor(depoch) % 146097;
    cent = uprv_floor(dqc / 36524);
    dcent = (int32_t)uprv_floor(dqc) % 36524;
    quad = uprv_floor(dcent / 1461);
    dquad = (int32_t)uprv_floor(dcent) % 1461;
    yindex = uprv_floor(dquad / 365);
    year = (int32_t)((quadricent * 400) + (cent * 100) + (quad * 4) + yindex);
    if (!((cent == 4) || (yindex == 4))) {
       year++;
    }
    yearday = wjd - gregorianToJD(year, 1, 1);
    leapadj = ((wjd < gregorianToJD(year, 3, 1)) ? 0
          :
          (isGregorianLeap(year) ? 1 : 2)
          );
    month = (int32_t)uprv_floor((((yearday + leapadj) * 12) + 373) / 367);
    day = (int32_t)(wjd - gregorianToJD(year, month, 1)) + 1;
    gregorianDate[0] = year;
    gregorianDate[1] = month;
    gregorianDate[2] = day;
    return gregorianDate;
 }
 //-------------------------------------------------------------------------
 // Functions for converting from field values to milliseconds....
 //-------------------------------------------------------------------------
 static double IndianToJD(int32_t year, int32_t month, int32_t date) {
    int32_t leapMonth, gyear, m;
    double start, jd;
    gyear = year + INDIAN_ERA_START;
    if(isGregorianLeap(gyear)) {
       leapMonth = 31;
       start = gregorianToJD(gyear, 3, 21);
    }
    else {
       leapMonth = 30;
       start = gregorianToJD(gyear, 3, 22);
    }
    if (month == 1) {
       jd = start + (date - 1);
    } else {
       jd = start + leapMonth;
       m = month - 2;
       //m = Math.min(m, 5);
       if (m > 5) {
           m = 5;
       }
       jd += m * 31;
       if (month >= 8) {
          m = month - 7;
          jd += m * 30;
       }
       jd += date - 1;
    }
    return jd;
 }
 /*
  * Return JD of start of given month/year of Indian Calendar
  * @param eyear The year in Indian Calendar measured from Saka Era (78 AD).
  * @param month The month in Indian calendar
  */
 int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */ ) const {
    //month is 0 based; converting it to 1-based
    int32_t imonth;
     // If the month is out of range, adjust it into range, and adjust the extended eyar accordingly
    if (month < 0 || month > 11) {
       eyear += (int32_t)ClockMath::floorDivide(month, 12, month);
    }
    if(month == 12){
        imonth = 1;
    } else {
        imonth = month + 1;
    }
    double jd = IndianToJD(eyear ,imonth, 1);
    return (int32_t)jd;
 }
 //-------------------------------------------------------------------------
 // Functions for converting from milliseconds to field values
 //-------------------------------------------------------------------------
 int32_t IndianCalendar::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 Indian
  * calendar system.  These are:
  *
  * <ul><li>ERA
  * <li>YEAR
  * <li>MONTH
  * <li>DAY_OF_MONTH
  * <li>EXTENDED_YEAR</ul>
  *
  * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
  * method is called. The getGregorianXxx() methods return Gregorian
  * calendar equivalents for the given Julian day.
  */
 void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode&  /* status */) {
     double jdAtStartOfGregYear;
     int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday;
     int32_t gregorianYear;      // Stores gregorian date corresponding to Julian day;
     int32_t gd[3];
     gregorianYear = jdToGregorian(julianDay, gd)[0];          // Gregorian date for Julian day
     IndianYear = gregorianYear - INDIAN_ERA_START;            // Year in Saka era
     jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year
     yday = (int32_t)(julianDay - jdAtStartOfGregYear);        // Day number in Gregorian year (starting from 0)
     if (yday < INDIAN_YEAR_START) {
         // Day is at the end of the preceding Saka year
         IndianYear -= 1;
         leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year
         yday += leapMonth + (31 * 5) + (30 * 3) + 10;
     } else {
         leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
         yday -= INDIAN_YEAR_START;
     }
     if (yday < leapMonth) {
         IndianMonth = 0;
         IndianDayOfMonth = yday + 1;
     } else {
         mday = yday - leapMonth;
         if (mday < (31 * 5)) {
             IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
             IndianDayOfMonth = (mday % 31) + 1;
         } else {
             mday -= 31 * 5;
             IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
             IndianDayOfMonth = (mday % 30) + 1;
         }
    }
    internalSet(UCAL_ERA, 0);
    internalSet(UCAL_EXTENDED_YEAR, IndianYear);
    internalSet(UCAL_YEAR, IndianYear);
    internalSet(UCAL_MONTH, IndianMonth);
    internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth);
    internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based
 }
 UBool
 IndianCalendar::inDaylightTime(UErrorCode& status) const
 {
     // copied from GregorianCalendar
     if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
         return FALSE;
     }
     // Force an update of the state of the Calendar.
     ((IndianCalendar*)this)->complete(status); // cast away const
     return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
 }
 // default century
 const UDate     IndianCalendar::fgSystemDefaultCentury          = DBL_MIN;
 const int32_t   IndianCalendar::fgSystemDefaultCenturyYear      = -1;
 UDate           IndianCalendar::fgSystemDefaultCenturyStart     = DBL_MIN;
 int32_t         IndianCalendar::fgSystemDefaultCenturyStartYear = -1;
 UBool IndianCalendar::haveDefaultCentury() const
 {
     return TRUE;
 }
 UDate IndianCalendar::defaultCenturyStart() const
 {
     return internalGetDefaultCenturyStart();
 }
 int32_t IndianCalendar::defaultCenturyStartYear() const
 {
     return internalGetDefaultCenturyStartYear();
 }
 UDate
 IndianCalendar::internalGetDefaultCenturyStart() const
 {
     // lazy-evaluate systemDefaultCenturyStart
     UBool needsUpdate;
     {
         Mutex m;
         needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
     }
     if (needsUpdate) {
         initializeSystemDefaultCentury();
     }
     // use defaultCenturyStart unless it's the flag value;
     // then use systemDefaultCenturyStart
     return fgSystemDefaultCenturyStart;
 }
 int32_t
 IndianCalendar::internalGetDefaultCenturyStartYear() const
 {
     // lazy-evaluate systemDefaultCenturyStartYear
     UBool needsUpdate;
     {
         Mutex m;
         needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
     }
     if (needsUpdate) {
         initializeSystemDefaultCentury();
     }
     // use defaultCenturyStart unless it's the flag value;
     // then use systemDefaultCenturyStartYear
     return    fgSystemDefaultCenturyStartYear;
 }
 void
 IndianCalendar::initializeSystemDefaultCentury()
 {
     // initialize systemDefaultCentury and systemDefaultCenturyYear based
     // on the current time.  They'll be set to 80 years before
     // the current time.
     // No point in locking as it should be idempotent.
     if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) {
         UErrorCode status = U_ZERO_ERROR;
         IndianCalendar calendar(Locale("@calendar=Indian"),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);
             {
                 Mutex m;
                 fgSystemDefaultCenturyStart = newStart;
                 fgSystemDefaultCenturyStartYear = newYear;
             }
         }
         // We have no recourse upon failure unless we want to propagate the failure
         // out.
     }
 }
 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)
 U_NAMESPACE_END
 #endif

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intl/icu/source/i18n/indiancal.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/indiancal.cpp