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Diffstat (limited to 'intl/icu/source/i18n/indiancal.cpp')
| -rw-r--r-- | intl/icu/source/i18n/indiancal.cpp | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/indiancal.cpp b/intl/icu/source/i18n/indiancal.cpp new file mode 100644 index 0000000000..f1ab853b94 --- /dev/null +++ b/intl/icu/source/i18n/indiancal.cpp @@ -0,0 +1,411 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* + * Copyright (C) 2003-2014, 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" + +// Debugging +#ifdef U_DEBUG_INDIANCAL +#include <stdio.h> +#include <stdarg.h> + +#endif + +U_NAMESPACE_BEGIN + +// Implementation of the IndianCalendar class + +//------------------------------------------------------------------------- +// Constructors... +//------------------------------------------------------------------------- + + +IndianCalendar* 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); +} + + +/** + * 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 IndianCalendar::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; + + 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 ); + + gSystemDefaultCenturyStart = newStart; + gSystemDefaultCenturyStartYear = newYear; + } + // We have no recourse upon failure. +} + + +UDate +IndianCalendar::defaultCenturyStart() const +{ + // lazy-evaluate systemDefaultCenturyStart + umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); + return gSystemDefaultCenturyStart; +} + +int32_t +IndianCalendar::defaultCenturyStartYear() const +{ + // lazy-evaluate systemDefaultCenturyStartYear + umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); + return gSystemDefaultCenturyStartYear; +} + + +UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar) + +U_NAMESPACE_END + +#endif + |