/*
******************************************************************************
- * Copyright (C) 2003-2008, International Business Machines Corporation
+ * Copyright (C) 2003-2012, International Business Machines Corporation
* and others. All Rights Reserved.
******************************************************************************
*
* Modification History:
*
* Date Name Description
- * 9/23/2003 mehran posted to icu-design
+ * 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
*****************************************************************************
*/
#if !UCONFIG_NO_FORMATTING
#include "umutex.h"
+#include "gregoimp.h" // Math
#include <float.h>
-static const int8_t monthDays[] = { 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29 };
+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 int32_t
-jalali_to_julian(int year, int month, int day)
-{
- int32_t daysNo=0;
- int i;
-
- year = year -475+2820;
- month -= 1;
-
- daysNo=(year/2820)*1029983;
- year=year % 2820;
-
- daysNo+=(year/128)* 46751;
- if((year/128)>21)
- {
- daysNo-=46751;
- year=(year%128)+128;
- }
- else
- year=year%128;
-
- if(year>=29)
- {
- year-=29;
- daysNo+=10592;
- }
-
- if(year>=66)
- {
- year-=66;
- daysNo+=24106;
- }
- else if( year>=33)
- {
- daysNo+=(year/33)* 12053;
- year=year%33;
- }
-
- if (year >= 5)
- {
- daysNo += 1826;
- year -=5;
- }
- else if (year == 4)
- {
- daysNo += 1460;
- year -=4;
- }
-
- daysNo += 1461 * (year/4);
- year %= 4;
- daysNo += 365 * year;
-
- for (i = 0; i < month; i++) {
- daysNo += monthDays[i];
- }
-
- daysNo += day;
-
- return daysNo-856493;
-}
-
-static void julian_to_jalali (int32_t daysNo, int *h_y, int *h_m, int *h_d)
-{
- int year=0, month=0, day=0,scalarDays=0;
- int i;
-
- daysNo+=856493;
- scalarDays=daysNo;
- year=(daysNo/1029983)*2820;
- daysNo=daysNo%1029983;
-
- if((daysNo/46751)<=21)
- {
- year+=(daysNo/46751)* 128;
- daysNo=daysNo%46751;
- }
- else
- {
- year+=(daysNo/46751)* 128;
- daysNo=daysNo%46751;
- year-=128;
- daysNo+=46751;
- }
-
- if (daysNo >= 10592)
- {
- year+= 29;
- daysNo -= 10592;
- }
-
- if(daysNo>=24106)
- {
- daysNo-=24106;
- year+=66;
- }
-
- if(daysNo>=12053)
- {
- daysNo-=12053;
- year+=33;
- }
-
-
- if (daysNo >= 1826)
- {
- year+= 5;
- daysNo -= 1826;
- }
- else if (daysNo > 1095)
- {
- year+= 3;
- daysNo -= 1095;
-
- }
-
- year +=(4 * (daysNo/1461));
- daysNo %= 1461;
-
- if (daysNo == 0)
- {
- year -= 1;
- daysNo = 366;
- }
- else
- {
- year += daysNo/365;
- daysNo = daysNo % 365;
- if (daysNo == 0)
- {
- year -= 1;
- daysNo = 365;
- }
-
- }
-
- for (i = 0; i < 11 && daysNo > monthDays[i]; ++i) {
- daysNo -= monthDays[i];
- }
-
- month = i + 1;
-
- day = daysNo;
-
- *h_d = day;
- *h_m = month;
- *h_y = year-2345;
-}
+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
//-------------------------------------------------------------------------
// Minimum / Maximum access functions
//-------------------------------------------------------------------------
-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, 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
-};
-static const int32_t MONTH_COUNT[12][4] = {
- //len len2 st st2
- { 31, 31, 0, 0 }, // Farvardin
- { 31, 31, 31, 31 }, // Ordibehesht
- { 31, 31, 62, 62 }, // Khordad
- { 31, 31, 93, 93 }, // Tir
- { 31, 31, 124, 124 }, // Mordad
- { 31, 31, 155, 155 }, // Shahrivar
- { 30, 30, 186, 186 }, // Mehr
- { 30, 30, 216, 216 }, // Aban
- { 30, 30, 246, 246 }, // Azar
- { 30, 30, 276, 276 }, // Dey
- { 30, 30, 306, 306 }, // Bahman
- { 29, 30, 336, 336 } // Esfand
- // len length of month
- // len2 length of month in a leap year
- // st days in year before start of month
- // st2 days in year before month in leap year
-};
int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
- return LIMITS[field][limitType];
+ return kPersianCalendarLimits[field][limitType];
}
//-------------------------------------------------------------------------
*/
UBool PersianCalendar::isLeapYear(int32_t year)
{
- return jalali_to_julian(year+1,1,1)-jalali_to_julian(year,1,1) == 366;
+ 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 Hijri epoch, origin 0.
+ * from the Persian epoch, origin 0.
*/
int32_t PersianCalendar::yearStart(int32_t year) {
- return handleComputeMonthStart(year,1,FALSE);
+ return handleComputeMonthStart(year,0,FALSE);
}
/**
* Return the day # on which the given month starts. Days are counted
- * from the Hijri epoch, origin 0.
+ * from the Persian epoch, origin 0.
*
- * @param year The hijri shamsi year
- * @param year The hijri shamsi month, 0-based
+ * @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,FALSE);
+ return handleComputeMonthStart(year,month,TRUE);
}
//----------------------------------------------------------------------
/**
* Return the length (in days) of the given month.
*
- * @param year The hijri shamsi year
- * @param year The hijri shamsi month, 0-based
+ * @param year The Persian year
+ * @param year The Persian month, 0-based
*/
int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
- return MONTH_COUNT[month][PersianCalendar::isLeapYear(extendedYear)?1:0];
+ // 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 365 + (PersianCalendar::isLeapYear(extendedYear) ? 1 : 0);
+ return isLeapYear(extendedYear) ? 366 : 365;
}
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
// Return JD of start of given month/year
-int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const {
+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 += month / 12;
- month = month % 12;
+ 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 jalali_to_julian(eyear,(useMonth?month+1:1),1)-1+1947955;
+
+ return julianDay;
}
//-------------------------------------------------------------------------
* <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.
+ * method is called.
*/
void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
- int jy,jm,jd;
- julian_to_jalali(julianDay-1947955,&jy,&jm,&jd);
+ 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, jy);
- internalSet(UCAL_EXTENDED_YEAR, jy);
- internalSet(UCAL_MONTH, jm-1);
- internalSet(UCAL_DAY_OF_MONTH, jd);
- internalSet(UCAL_DAY_OF_YEAR, jd + MONTH_COUNT[jm-1][2]);
+ 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
projects / apple / icu.git / blobdiff