michael@0: /*
michael@0:  **********************************************************************
michael@0:  * Copyright (c) 2003-2008, International Business Machines
michael@0:  * Corporation and others.  All Rights Reserved.
michael@0:  **********************************************************************
michael@0:  * Author: Alan Liu
michael@0:  * Created: September 2 2003
michael@0:  * Since: ICU 2.8
michael@0:  **********************************************************************
michael@0:  */
michael@0: 
michael@0: #include "gregoimp.h"
michael@0: 
michael@0: #if !UCONFIG_NO_FORMATTING
michael@0: 
michael@0: #include "unicode/ucal.h"
michael@0: #include "uresimp.h"
michael@0: #include "cstring.h"
michael@0: #include "uassert.h"
michael@0: 
michael@0: #if defined(U_DEBUG_CALDATA)
michael@0: #include <stdio.h>
michael@0: #endif
michael@0: 
michael@0: U_NAMESPACE_BEGIN
michael@0: 
michael@0: int32_t ClockMath::floorDivide(int32_t numerator, int32_t denominator) {
michael@0:     return (numerator >= 0) ?
michael@0:         numerator / denominator : ((numerator + 1) / denominator) - 1;
michael@0: }
michael@0: 
michael@0: int32_t ClockMath::floorDivide(double numerator, int32_t denominator,
michael@0:                           int32_t& remainder) {
michael@0:     double quotient;
michael@0:     quotient = uprv_floor(numerator / denominator);
michael@0:     remainder = (int32_t) (numerator - (quotient * denominator));
michael@0:     return (int32_t) quotient;
michael@0: }
michael@0: 
michael@0: double ClockMath::floorDivide(double dividend, double divisor,
michael@0:                          double& remainder) {
michael@0:     // Only designed to work for positive divisors
michael@0:     U_ASSERT(divisor > 0);
michael@0:     double quotient = floorDivide(dividend, divisor);
michael@0:     remainder = dividend - (quotient * divisor);
michael@0:     // N.B. For certain large dividends, on certain platforms, there
michael@0:     // is a bug such that the quotient is off by one.  If you doubt
michael@0:     // this to be true, set a breakpoint below and run cintltst.
michael@0:     if (remainder < 0 || remainder >= divisor) {
michael@0:         // E.g. 6.7317038241449352e+022 / 86400000.0 is wrong on my
michael@0:         // machine (too high by one).  4.1792057231752762e+024 /
michael@0:         // 86400000.0 is wrong the other way (too low).
michael@0:         double q = quotient;
michael@0:         quotient += (remainder < 0) ? -1 : +1;
michael@0:         if (q == quotient) {
michael@0:             // For quotients > ~2^53, we won't be able to add or
michael@0:             // subtract one, since the LSB of the mantissa will be >
michael@0:             // 2^0; that is, the exponent (base 2) will be larger than
michael@0:             // the length, in bits, of the mantissa.  In that case, we
michael@0:             // can't give a correct answer, so we set the remainder to
michael@0:             // zero.  This has the desired effect of making extreme
michael@0:             // values give back an approximate answer rather than
michael@0:             // crashing.  For example, UDate values above a ~10^25
michael@0:             // might all have a time of midnight.
michael@0:             remainder = 0;
michael@0:         } else {
michael@0:             remainder = dividend - (quotient * divisor);
michael@0:         }
michael@0:     }
michael@0:     U_ASSERT(0 <= remainder && remainder < divisor);
michael@0:     return quotient;
michael@0: }
michael@0: 
michael@0: const int32_t JULIAN_1_CE    = 1721426; // January 1, 1 CE Gregorian
michael@0: const int32_t JULIAN_1970_CE = 2440588; // January 1, 1970 CE Gregorian
michael@0: 
michael@0: const int16_t Grego::DAYS_BEFORE[24] =
michael@0:     {0,31,59,90,120,151,181,212,243,273,304,334,
michael@0:      0,31,60,91,121,152,182,213,244,274,305,335};
michael@0: 
michael@0: const int8_t Grego::MONTH_LENGTH[24] =
michael@0:     {31,28,31,30,31,30,31,31,30,31,30,31,
michael@0:      31,29,31,30,31,30,31,31,30,31,30,31};
michael@0: 
michael@0: double Grego::fieldsToDay(int32_t year, int32_t month, int32_t dom) {
michael@0: 
michael@0:     int32_t y = year - 1;
michael@0: 
michael@0:     double julian = 365 * y + ClockMath::floorDivide(y, 4) + (JULIAN_1_CE - 3) + // Julian cal
michael@0:         ClockMath::floorDivide(y, 400) - ClockMath::floorDivide(y, 100) + 2 + // => Gregorian cal
michael@0:         DAYS_BEFORE[month + (isLeapYear(year) ? 12 : 0)] + dom; // => month/dom
michael@0: 
michael@0:     return julian - JULIAN_1970_CE; // JD => epoch day
michael@0: }
michael@0: 
michael@0: void Grego::dayToFields(double day, int32_t& year, int32_t& month,
michael@0:                         int32_t& dom, int32_t& dow, int32_t& doy) {
michael@0: 
michael@0:     // Convert from 1970 CE epoch to 1 CE epoch (Gregorian calendar)
michael@0:     day += JULIAN_1970_CE - JULIAN_1_CE;
michael@0: 
michael@0:     // Convert from the day number to the multiple radix
michael@0:     // representation.  We use 400-year, 100-year, and 4-year cycles.
michael@0:     // For example, the 4-year cycle has 4 years + 1 leap day; giving
michael@0:     // 1461 == 365*4 + 1 days.
michael@0:     int32_t n400 = ClockMath::floorDivide(day, 146097, doy); // 400-year cycle length
michael@0:     int32_t n100 = ClockMath::floorDivide(doy, 36524, doy); // 100-year cycle length
michael@0:     int32_t n4   = ClockMath::floorDivide(doy, 1461, doy); // 4-year cycle length
michael@0:     int32_t n1   = ClockMath::floorDivide(doy, 365, doy);
michael@0:     year = 400*n400 + 100*n100 + 4*n4 + n1;
michael@0:     if (n100 == 4 || n1 == 4) {
michael@0:         doy = 365; // Dec 31 at end of 4- or 400-year cycle
michael@0:     } else {
michael@0:         ++year;
michael@0:     }
michael@0:     
michael@0:     UBool isLeap = isLeapYear(year);
michael@0:     
michael@0:     // Gregorian day zero is a Monday.
michael@0:     dow = (int32_t) uprv_fmod(day + 1, 7);
michael@0:     dow += (dow < 0) ? (UCAL_SUNDAY + 7) : UCAL_SUNDAY;
michael@0: 
michael@0:     // Common Julian/Gregorian calculation
michael@0:     int32_t correction = 0;
michael@0:     int32_t march1 = isLeap ? 60 : 59; // zero-based DOY for March 1
michael@0:     if (doy >= march1) {
michael@0:         correction = isLeap ? 1 : 2;
michael@0:     }
michael@0:     month = (12 * (doy + correction) + 6) / 367; // zero-based month
michael@0:     dom = doy - DAYS_BEFORE[month + (isLeap ? 12 : 0)] + 1; // one-based DOM
michael@0:     doy++; // one-based doy
michael@0: }
michael@0: 
michael@0: void Grego::timeToFields(UDate time, int32_t& year, int32_t& month,
michael@0:                         int32_t& dom, int32_t& dow, int32_t& doy, int32_t& mid) {
michael@0:     double millisInDay;
michael@0:     double day = ClockMath::floorDivide((double)time, (double)U_MILLIS_PER_DAY, millisInDay);
michael@0:     mid = (int32_t)millisInDay;
michael@0:     dayToFields(day, year, month, dom, dow, doy);
michael@0: }
michael@0: 
michael@0: int32_t Grego::dayOfWeek(double day) {
michael@0:     int32_t dow;
michael@0:     ClockMath::floorDivide(day + UCAL_THURSDAY, 7, dow);
michael@0:     return (dow == 0) ? UCAL_SATURDAY : dow;
michael@0: }
michael@0: 
michael@0: int32_t Grego::dayOfWeekInMonth(int32_t year, int32_t month, int32_t dom) {
michael@0:     int32_t weekInMonth = (dom + 6)/7;
michael@0:     if (weekInMonth == 4) {
michael@0:         if (dom + 7 > monthLength(year, month)) {
michael@0:             weekInMonth = -1;
michael@0:         }
michael@0:     } else if (weekInMonth == 5) {
michael@0:         weekInMonth = -1;
michael@0:     }
michael@0:     return weekInMonth;
michael@0: }
michael@0: 
michael@0: /* ---- CalendarData ------ */
michael@0: 
michael@0: #define U_CALENDAR_KEY "calendar"
michael@0: #define U_GREGORIAN_KEY "gregorian"
michael@0: #define U_FORMAT_KEY "format"
michael@0: #define U_DEFAULT_KEY "default"
michael@0: #define U_CALENDAR_DATA ((char*)0)
michael@0: 
michael@0: 
michael@0: // CalendarData::CalendarData(const Locale& loc, UErrorCode& status) 
michael@0: //   : fFillin(NULL), fBundle(NULL), fFallback(NULL) {
michael@0: //   initData(loc.getBaseName(), (char*) "???", status);
michael@0: // }
michael@0: 
michael@0: CalendarData::CalendarData(const Locale& loc, const char *type, UErrorCode& status)
michael@0:   : fFillin(NULL), fOtherFillin(NULL), fBundle(NULL), fFallback(NULL) {
michael@0:   initData(loc.getBaseName(), type, status);
michael@0: }
michael@0: 
michael@0: void CalendarData::initData(const char *locale, const char *type, UErrorCode& status) {
michael@0:   fOtherFillin = ures_open(U_CALENDAR_DATA, locale, &status);
michael@0:   fFillin = ures_getByKey(fOtherFillin, U_CALENDAR_KEY, fFillin, &status);
michael@0: 
michael@0:   if((type != NULL) && 
michael@0:      (*type != '\0') && 
michael@0:      (uprv_strcmp(type, U_GREGORIAN_KEY)))
michael@0:   {
michael@0:     fBundle = ures_getByKeyWithFallback(fFillin, type, NULL, &status);
michael@0:     fFallback = ures_getByKeyWithFallback(fFillin, U_GREGORIAN_KEY, NULL, &status);
michael@0: 
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:     fprintf(stderr, "%p: CalendarData(%s, %s, %s) -> main(%p, %s)=%s, fallback(%p, %s)=%s\n", 
michael@0:             this, locale, type, u_errorName(status), fBundle, type, fBundle?ures_getLocale(fBundle, &status):"", 
michael@0:             fFallback, U_GREGORIAN_KEY, fFallback?ures_getLocale(fFallback, &status):"");
michael@0: #endif
michael@0: 
michael@0:   } else {
michael@0:     fBundle = ures_getByKeyWithFallback(fFillin, U_GREGORIAN_KEY, NULL, &status);
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:     fprintf(stderr, "%p: CalendarData(%s, %s, %s) -> main(%p, %s)=%s, fallback = NULL\n",
michael@0:             this, locale, type, u_errorName(status), fBundle, U_GREGORIAN_KEY, fBundle?ures_getLocale(fBundle, &status):"" );
michael@0: #endif
michael@0:   }
michael@0: }
michael@0: 
michael@0: CalendarData::~CalendarData() {
michael@0:     ures_close(fFillin);
michael@0:     ures_close(fBundle);
michael@0:     ures_close(fFallback);
michael@0:     ures_close(fOtherFillin);
michael@0: }
michael@0: 
michael@0: UResourceBundle*
michael@0: CalendarData::getByKey(const char *key, UErrorCode& status) {
michael@0:     if(U_FAILURE(status)) {
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     if(fBundle) {
michael@0:         fFillin = ures_getByKeyWithFallback(fBundle, key, fFillin, &status);
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: get %s -> %s - from MAIN %s\n",this, key, u_errorName(status), ures_getLocale(fFillin, &status));
michael@0: #endif
michael@0:     }
michael@0:     if(fFallback && (status == U_MISSING_RESOURCE_ERROR)) {
michael@0:         status = U_ZERO_ERROR; // retry with fallback (gregorian)
michael@0:         fFillin = ures_getByKeyWithFallback(fFallback, key, fFillin, &status);
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: get %s -> %s - from FALLBACK %s\n",this, key, u_errorName(status), ures_getLocale(fFillin, &status));
michael@0: #endif
michael@0:     }
michael@0:     return fFillin;
michael@0: }
michael@0: 
michael@0: UResourceBundle* CalendarData::getByKey2(const char *key, const char *subKey, UErrorCode& status) {
michael@0:     if(U_FAILURE(status)) {
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     if(fBundle) {
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: //\n");
michael@0: #endif
michael@0:         fFillin = ures_getByKeyWithFallback(fBundle, key, fFillin, &status);
michael@0:         fOtherFillin = ures_getByKeyWithFallback(fFillin, U_FORMAT_KEY, fOtherFillin, &status);
michael@0:         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: get %s/format/%s -> %s - from MAIN %s\n", this, key, subKey, u_errorName(status), ures_getLocale(fFillin, &status));
michael@0: #endif
michael@0:     }
michael@0:     if(fFallback && (status == U_MISSING_RESOURCE_ERROR)) {
michael@0:         status = U_ZERO_ERROR; // retry with fallback (gregorian)
michael@0:         fFillin = ures_getByKeyWithFallback(fFallback, key, fFillin, &status);
michael@0:         fOtherFillin = ures_getByKeyWithFallback(fFillin, U_FORMAT_KEY, fOtherFillin, &status);
michael@0:         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: get %s/format/%s -> %s - from FALLBACK %s\n",this, key, subKey, u_errorName(status), ures_getLocale(fFillin,&status));
michael@0: #endif
michael@0:     }
michael@0: 
michael@0: //// handling of 'default' keyword on failure: Commented out for 3.0.
michael@0: //   if((status == U_MISSING_RESOURCE_ERROR) && 
michael@0: //      uprv_strcmp(subKey,U_DEFAULT_KEY)) { // avoid recursion
michael@0: // #if defined (U_DEBUG_CALDATA)
michael@0: //     fprintf(stderr, "%p: - attempting fallback -\n", this);
michael@0: //     fflush(stderr);
michael@0: // #endif
michael@0: //     UErrorCode subStatus = U_ZERO_ERROR;
michael@0: //     int32_t len;
michael@0: //     char kwBuf[128] = "";
michael@0: //     const UChar *kw;
michael@0: //     /* fFillin = */ getByKey2(key, U_DEFAULT_KEY, subStatus);
michael@0: //     kw = ures_getString(fFillin, &len, &subStatus);
michael@0: //     if(len>126) { // too big
michael@0: //       len = 0;
michael@0: //     }
michael@0: //     if(U_SUCCESS(subStatus) && (len>0)) {
michael@0: //       u_UCharsToChars(kw, kwBuf, len+1);
michael@0: //       if(*kwBuf && uprv_strcmp(kwBuf,subKey)) {
michael@0: // #if defined (U_DEBUG_CALDATA)
michael@0: //         fprintf(stderr, "%p: trying  %s/format/default -> \"%s\"\n",this, key, kwBuf);
michael@0: // #endif
michael@0: //         // now try again with the default
michael@0: //         status = U_ZERO_ERROR;
michael@0: //         /* fFillin = */ getByKey2(key, kwBuf, status);
michael@0: //       }
michael@0: // #if defined (U_DEBUG_CALDATA)
michael@0: //     } else {
michael@0: //       fprintf(stderr, "%p: could not load  %s/format/default  - fail out (%s)\n",this, key, kwBuf, u_errorName(status));
michael@0: // #endif
michael@0: //     }
michael@0: //   }
michael@0: 
michael@0:     return fFillin;
michael@0: }
michael@0: 
michael@0: UResourceBundle* CalendarData::getByKey3(const char *key, const char *contextKey, const char *subKey, UErrorCode& status) {
michael@0:     if(U_FAILURE(status)) {
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     if(fBundle) {
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: //\n");
michael@0: #endif
michael@0:         fFillin = ures_getByKeyWithFallback(fBundle, key, fFillin, &status);
michael@0:         fOtherFillin = ures_getByKeyWithFallback(fFillin, contextKey, fOtherFillin, &status);
michael@0:         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: get %s/%s/%s -> %s - from MAIN %s\n", this, key, contextKey, subKey, u_errorName(status), ures_getLocale(fFillin, &status));
michael@0: #endif
michael@0:     }
michael@0:     if(fFallback && (status == U_MISSING_RESOURCE_ERROR)) {
michael@0:         status = U_ZERO_ERROR; // retry with fallback (gregorian)
michael@0:         fFillin = ures_getByKeyWithFallback(fFallback, key, fFillin, &status);
michael@0:         fOtherFillin = ures_getByKeyWithFallback(fFillin, contextKey, fOtherFillin, &status);
michael@0:         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
michael@0: #if defined (U_DEBUG_CALDATA)
michael@0:         fprintf(stderr, "%p: get %s/%s/%s -> %s - from FALLBACK %s\n",this, key, contextKey, subKey, u_errorName(status), ures_getLocale(fFillin,&status));
michael@0: #endif
michael@0:     }
michael@0: 
michael@0:     return fFillin;
michael@0: }
michael@0: 
michael@0: U_NAMESPACE_END
michael@0: 
michael@0: #endif
michael@0: //eof