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+/*
+ * Copyright (C) 2003-2007, International Business Machines Corporation
+ * and others. All Rights Reserved.
+ ******************************************************************************
+ *
+ * File PERSNCAL.CPP
+ *
+ * Modification History:
+ *
+ * Date Name Description
+ * 9/23/2003 mehran posted to icu-design
+ *****************************************************************************
+ */
+#include "persncal.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+static const int monthDays[] = { 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29 };
+
+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;
+}
+
+U_NAMESPACE_BEGIN
+
+// Implementation of the PersianCalendar class
+
+//-------------------------------------------------------------------------
+// Constructors...
+//-------------------------------------------------------------------------
+
+const char *PersianCalendar::getType() const {
+ return "persian";
+}
+
+Calendar* PersianCalendar::clone() const {
+ return new PersianCalendar(*this);
+}
+
+PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
+ : Calendar(TimeZone::createDefault(), aLocale, success)
+{
+ setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
+}
+
+PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
+}
+
+PersianCalendar::~PersianCalendar()
+{
+}
+
+//-------------------------------------------------------------------------
+// Minimum / Maximum access functions
+//-------------------------------------------------------------------------
+
+static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
+ // Minimum Greatest Least Maximum
+ // Minimum Maximum
+ { 0, 0, 0, 0 }, // ERA
+ { -2500, -2500, 2500, 2500 }, // YEAR
+ { 0, 0, 11, 11 }, // MONTH
+ { 1, 1, 52, 53 }, // WEEK_OF_YEAR
+ { 0, 0, 5, 6 }, // WEEK_OF_MONTH
+ { 1, 1, 29, 31 }, // DAY_OF_MONTH
+ { 1, 1, 365, 366 }, // DAY_OF_YEAR
+ { 0, 0, 6, 6 }, // DAY_OF_WEEK
+ { 1, 1, 4, 6 }, // DAY_OF_WEEK_IN_MONTH
+ { 0, 0, 1, 1 }, // AM_PM
+ { 0, 0, 11, 11 }, // HOUR
+ { 0, 0, 23, 23 }, // HOUR_OF_DAY
+ { 0, 0, 59, 59 }, // MINUTE
+ { 0, 0, 59, 59 }, // SECOND
+ { 0, 0, 999, 999 }, // MILLISECOND
+ { -12, -12, 12, 12 }, // ZONE_OFFSET
+ { 0, 0, 1, 1 }, // DST_OFFSET
+ { -140742, -140742, 144683, 140742 }, // YEAR_WOY
+ { 0, 0, 6, 6 }, // DOW_LOCAL
+ { -2500, -2500, 2500, 2500 }, // EXTENDED_YEAR
+ {/* -1, -1, -1, -1 */}, // JULIAN_DAY
+ {/* -1, -1, -1, -1 */}, // MILLISECONDS_IN_DAY
+};
+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];
+}
+
+//-------------------------------------------------------------------------
+// Assorted calculation utilities
+//
+
+/**
+ * Determine whether a year is a leap year in the Persian calendar
+ */
+UBool PersianCalendar::isLeapYear(int32_t year)
+{
+ return jalali_to_julian(year+1,1,1)-jalali_to_julian(year,1,1) == 366;
+}
+
+/**
+ * Return the day # on which the given year starts. Days are counted
+ * from the Hijri epoch, origin 0.
+ */
+int32_t PersianCalendar::yearStart(int32_t year) {
+ return handleComputeMonthStart(year,1,FALSE);
+}
+
+/**
+ * Return the day # on which the given month starts. Days are counted
+ * from the Hijri epoch, origin 0.
+ *
+ * @param year The hijri shamsi year
+ * @param year The hijri shamsi month, 0-based
+ */
+int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
+ return handleComputeMonthStart(year,month,FALSE);
+}
+
+//----------------------------------------------------------------------
+// Calendar framework
+//----------------------------------------------------------------------
+
+/**
+ * Return the length (in days) of the given month.
+ *
+ * @param year The hijri shamsi year
+ * @param year The hijri shamsi month, 0-based
+ */
+int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
+ return MONTH_COUNT[month][PersianCalendar::isLeapYear(extendedYear)?1:0];
+}
+
+/**
+ * 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);
+}
+
+//-------------------------------------------------------------------------
+// Functions for converting from field values to milliseconds....
+//-------------------------------------------------------------------------
+
+// Return JD of start of given month/year
+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;
+ }
+ return jalali_to_julian(eyear,(useMonth?month+1:1),1)-1+1947955;
+}
+
+//-------------------------------------------------------------------------
+// Functions for converting from milliseconds to field values
+//-------------------------------------------------------------------------
+
+int32_t PersianCalendar::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 Persian
+ * calendar system. These are:
+ *
+ * <ul><li>ERA
+ * <li>YEAR
+ * <li>MONTH
+ * <li>DAY_OF_MONTH
+ * <li>DAY_OF_YEAR
+ * <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 PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
+ int jy,jm,jd;
+ julian_to_jalali(julianDay-1947955,&jy,&jm,&jd);
+ 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]);
+}
+
+UBool
+PersianCalendar::inDaylightTime(UErrorCode& status) const
+{
+ // copied from GregorianCalendar
+ if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
+ return FALSE;
+
+ // Force an update of the state of the Calendar.
+ ((PersianCalendar*)this)->complete(status); // cast away const
+
+ return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
+}
+
+UBool PersianCalendar::haveDefaultCentury() const
+{
+ return FALSE;
+}
+
+UDate PersianCalendar::defaultCenturyStart() const
+{
+ return -1;
+}
+
+int32_t PersianCalendar::defaultCenturyStartYear() const
+{
+ return -1;
+}
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
+
+U_NAMESPACE_END
+
+#endif
+