466 lines
12 KiB
C++
466 lines
12 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 2003-2008, International Business Machines Corporation
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* and others. All Rights Reserved.
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******************************************************************************
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*
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* File PERSNCAL.CPP
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*
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* Modification History:
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*
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* Date Name Description
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* 9/23/2003 mehran posted to icu-design
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*****************************************************************************
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*/
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#include "persncal.h"
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#if !UCONFIG_NO_FORMATTING
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#include "umutex.h"
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#include <float.h>
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static const int8_t monthDays[] = { 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29 };
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static int32_t
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jalali_to_julian(int year, int month, int day)
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{
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int32_t daysNo=0;
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int i;
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year = year -475+2820;
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month -= 1;
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daysNo=(year/2820)*1029983;
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year=year % 2820;
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daysNo+=(year/128)* 46751;
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if((year/128)>21)
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{
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daysNo-=46751;
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year=(year%128)+128;
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}
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else
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year=year%128;
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if(year>=29)
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{
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year-=29;
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daysNo+=10592;
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}
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if(year>=66)
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{
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year-=66;
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daysNo+=24106;
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}
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else if( year>=33)
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{
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daysNo+=(year/33)* 12053;
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year=year%33;
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}
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if (year >= 5)
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{
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daysNo += 1826;
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year -=5;
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}
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else if (year == 4)
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{
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daysNo += 1460;
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year -=4;
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}
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daysNo += 1461 * (year/4);
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year %= 4;
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daysNo += 365 * year;
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for (i = 0; i < month; i++) {
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daysNo += monthDays[i];
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}
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daysNo += day;
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return daysNo-856493;
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}
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static void julian_to_jalali (int32_t daysNo, int *h_y, int *h_m, int *h_d)
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{
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int year=0, month=0, day=0,scalarDays=0;
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int i;
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daysNo+=856493;
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scalarDays=daysNo;
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year=(daysNo/1029983)*2820;
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daysNo=daysNo%1029983;
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if((daysNo/46751)<=21)
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{
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year+=(daysNo/46751)* 128;
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daysNo=daysNo%46751;
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}
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else
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{
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year+=(daysNo/46751)* 128;
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daysNo=daysNo%46751;
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year-=128;
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daysNo+=46751;
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}
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if (daysNo >= 10592)
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{
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year+= 29;
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daysNo -= 10592;
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}
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if(daysNo>=24106)
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{
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daysNo-=24106;
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year+=66;
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}
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if(daysNo>=12053)
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{
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daysNo-=12053;
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year+=33;
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}
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if (daysNo >= 1826)
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{
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year+= 5;
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daysNo -= 1826;
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}
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else if (daysNo > 1095)
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{
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year+= 3;
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daysNo -= 1095;
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}
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year +=(4 * (daysNo/1461));
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daysNo %= 1461;
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if (daysNo == 0)
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{
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year -= 1;
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daysNo = 366;
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}
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else
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{
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year += daysNo/365;
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daysNo = daysNo % 365;
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if (daysNo == 0)
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{
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year -= 1;
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daysNo = 365;
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}
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}
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for (i = 0; i < 11 && daysNo > monthDays[i]; ++i) {
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daysNo -= monthDays[i];
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}
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month = i + 1;
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day = daysNo;
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*h_d = day;
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*h_m = month;
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*h_y = year-2345;
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}
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U_NAMESPACE_BEGIN
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// Implementation of the PersianCalendar class
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//-------------------------------------------------------------------------
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// Constructors...
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//-------------------------------------------------------------------------
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const char *PersianCalendar::getType() const {
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return "persian";
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}
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Calendar* PersianCalendar::clone() const {
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return new PersianCalendar(*this);
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}
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PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
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: Calendar(TimeZone::createDefault(), aLocale, success)
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{
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setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
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}
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PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
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}
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PersianCalendar::~PersianCalendar()
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{
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}
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//-------------------------------------------------------------------------
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// Minimum / Maximum access functions
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//-------------------------------------------------------------------------
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static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
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// Minimum Greatest Least Maximum
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// Minimum Maximum
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{ 0, 0, 0, 0}, // ERA
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{ -5000000, -5000000, 5000000, 5000000}, // YEAR
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{ 0, 0, 11, 11}, // MONTH
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{ 1, 1, 52, 53}, // WEEK_OF_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
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{ 1, 1, 29, 31}, // DAY_OF_MONTH
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{ 1, 1, 365, 366}, // DAY_OF_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
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{ 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
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{ -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
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{ -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
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};
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static const int32_t MONTH_COUNT[12][4] = {
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//len len2 st st2
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{ 31, 31, 0, 0 }, // Farvardin
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{ 31, 31, 31, 31 }, // Ordibehesht
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{ 31, 31, 62, 62 }, // Khordad
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{ 31, 31, 93, 93 }, // Tir
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{ 31, 31, 124, 124 }, // Mordad
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{ 31, 31, 155, 155 }, // Shahrivar
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{ 30, 30, 186, 186 }, // Mehr
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{ 30, 30, 216, 216 }, // Aban
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{ 30, 30, 246, 246 }, // Azar
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{ 30, 30, 276, 276 }, // Dey
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{ 30, 30, 306, 306 }, // Bahman
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{ 29, 30, 336, 336 } // Esfand
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// len length of month
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// len2 length of month in a leap year
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// st days in year before start of month
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// st2 days in year before month in leap year
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};
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int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
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return LIMITS[field][limitType];
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}
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//-------------------------------------------------------------------------
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// Assorted calculation utilities
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//
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/**
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* Determine whether a year is a leap year in the Persian calendar
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*/
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UBool PersianCalendar::isLeapYear(int32_t year)
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{
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return jalali_to_julian(year+1,1,1)-jalali_to_julian(year,1,1) == 366;
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}
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/**
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* Return the day # on which the given year starts. Days are counted
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* from the Hijri epoch, origin 0.
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*/
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int32_t PersianCalendar::yearStart(int32_t year) {
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return handleComputeMonthStart(year,1,FALSE);
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}
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/**
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* Return the day # on which the given month starts. Days are counted
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* from the Hijri epoch, origin 0.
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*
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* @param year The hijri shamsi year
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* @param year The hijri shamsi month, 0-based
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*/
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int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
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return handleComputeMonthStart(year,month,FALSE);
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}
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//----------------------------------------------------------------------
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// Calendar framework
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//----------------------------------------------------------------------
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/**
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* Return the length (in days) of the given month.
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*
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* @param year The hijri shamsi year
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* @param year The hijri shamsi month, 0-based
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*/
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int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
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return MONTH_COUNT[month][PersianCalendar::isLeapYear(extendedYear)?1:0];
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}
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/**
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* Return the number of days in the given Persian year
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*/
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int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
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return 365 + (PersianCalendar::isLeapYear(extendedYear) ? 1 : 0);
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}
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//-------------------------------------------------------------------------
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// Functions for converting from field values to milliseconds....
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//-------------------------------------------------------------------------
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// Return JD of start of given month/year
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int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const {
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// If the month is out of range, adjust it into range, and
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// modify the extended year value accordingly.
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if (month < 0 || month > 11) {
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eyear += month / 12;
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month = month % 12;
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}
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return jalali_to_julian(eyear,(useMonth?month+1:1),1)-1+1947955;
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}
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//-------------------------------------------------------------------------
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// Functions for converting from milliseconds to field values
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//-------------------------------------------------------------------------
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int32_t PersianCalendar::handleGetExtendedYear() {
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int32_t year;
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if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
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year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
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} else {
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year = internalGet(UCAL_YEAR, 1); // Default to year 1
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}
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return year;
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}
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/**
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* Override Calendar to compute several fields specific to the Persian
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* calendar system. These are:
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*
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* <ul><li>ERA
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* <li>YEAR
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* <li>MONTH
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* <li>DAY_OF_MONTH
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* <li>DAY_OF_YEAR
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* <li>EXTENDED_YEAR</ul>
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*
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* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
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* method is called. The getGregorianXxx() methods return Gregorian
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* calendar equivalents for the given Julian day.
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*/
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void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
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int jy,jm,jd;
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julian_to_jalali(julianDay-1947955,&jy,&jm,&jd);
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internalSet(UCAL_ERA, 0);
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internalSet(UCAL_YEAR, jy);
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internalSet(UCAL_EXTENDED_YEAR, jy);
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internalSet(UCAL_MONTH, jm-1);
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internalSet(UCAL_DAY_OF_MONTH, jd);
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internalSet(UCAL_DAY_OF_YEAR, jd + MONTH_COUNT[jm-1][2]);
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}
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UBool
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PersianCalendar::inDaylightTime(UErrorCode& status) const
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{
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// copied from GregorianCalendar
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if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
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return FALSE;
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// Force an update of the state of the Calendar.
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((PersianCalendar*)this)->complete(status); // cast away const
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return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
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}
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// default century
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const UDate PersianCalendar::fgSystemDefaultCentury = DBL_MIN;
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const int32_t PersianCalendar::fgSystemDefaultCenturyYear = -1;
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UDate PersianCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
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int32_t PersianCalendar::fgSystemDefaultCenturyStartYear = -1;
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UBool PersianCalendar::haveDefaultCentury() const
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{
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return TRUE;
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}
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UDate PersianCalendar::defaultCenturyStart() const
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{
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return internalGetDefaultCenturyStart();
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}
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int32_t PersianCalendar::defaultCenturyStartYear() const
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{
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return internalGetDefaultCenturyStartYear();
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}
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UDate
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PersianCalendar::internalGetDefaultCenturyStart() const
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{
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// lazy-evaluate systemDefaultCenturyStart
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UBool needsUpdate;
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UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
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if (needsUpdate) {
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initializeSystemDefaultCentury();
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}
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// use defaultCenturyStart unless it's the flag value;
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// then use systemDefaultCenturyStart
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return fgSystemDefaultCenturyStart;
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}
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int32_t
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PersianCalendar::internalGetDefaultCenturyStartYear() const
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{
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// lazy-evaluate systemDefaultCenturyStartYear
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UBool needsUpdate;
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UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
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if (needsUpdate) {
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initializeSystemDefaultCentury();
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}
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// use defaultCenturyStart unless it's the flag value;
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// then use systemDefaultCenturyStartYear
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return fgSystemDefaultCenturyStartYear;
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}
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void
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PersianCalendar::initializeSystemDefaultCentury()
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{
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// initialize systemDefaultCentury and systemDefaultCenturyYear based
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// on the current time. They'll be set to 80 years before
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// the current time.
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UErrorCode status = U_ZERO_ERROR;
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PersianCalendar calendar(Locale("@calendar=persian"),status);
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if (U_SUCCESS(status))
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{
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calendar.setTime(Calendar::getNow(), status);
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calendar.add(UCAL_YEAR, -80, status);
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UDate newStart = calendar.getTime(status);
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int32_t newYear = calendar.get(UCAL_YEAR, status);
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umtx_lock(NULL);
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if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
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{
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fgSystemDefaultCenturyStartYear = newYear;
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fgSystemDefaultCenturyStart = newStart;
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}
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umtx_unlock(NULL);
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}
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// We have no recourse upon failure unless we want to propagate the failure
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// out.
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}
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
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U_NAMESPACE_END
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#endif
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