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icu46/source/i18n/persncal.cpp

+/*
+ ******************************************************************************
+ * Copyright (C) 2003-2008, 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
+
+#include "umutex.h"
+#include <float.h>
+
+static const int8_t 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
+    { -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];
+}
+
+//-------------------------------------------------------------------------
+// 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);
+}
+
+// default century
+const UDate     PersianCalendar::fgSystemDefaultCentury        = DBL_MIN;
+const int32_t   PersianCalendar::fgSystemDefaultCenturyYear    = -1;
+
+UDate           PersianCalendar::fgSystemDefaultCenturyStart       = DBL_MIN;
+int32_t         PersianCalendar::fgSystemDefaultCenturyStartYear   = -1;
+
+UBool PersianCalendar::haveDefaultCentury() const
+{
+    return TRUE;
+}
+
+UDate PersianCalendar::defaultCenturyStart() const
+{
+    return internalGetDefaultCenturyStart();
+}
+
+int32_t PersianCalendar::defaultCenturyStartYear() const
+{
+    return internalGetDefaultCenturyStartYear();
+}
+
+UDate
+PersianCalendar::internalGetDefaultCenturyStart() const
+{
+    // lazy-evaluate systemDefaultCenturyStart
+    UBool needsUpdate;
+    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
+
+    if (needsUpdate) {
+        initializeSystemDefaultCentury();
+    }
+
+    // use defaultCenturyStart unless it's the flag value;
+    // then use systemDefaultCenturyStart
+
+    return fgSystemDefaultCenturyStart;
+}
+
+int32_t
+PersianCalendar::internalGetDefaultCenturyStartYear() const
+{
+    // lazy-evaluate systemDefaultCenturyStartYear
+    UBool needsUpdate;
+    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
+
+    if (needsUpdate) {
+        initializeSystemDefaultCentury();
+    }
+
+    // use defaultCenturyStart unless it's the flag value;
+    // then use systemDefaultCenturyStartYear
+
+    return    fgSystemDefaultCenturyStartYear;
+}
+
+void
+PersianCalendar::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;
+    PersianCalendar calendar(Locale("@calendar=persian"),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);
+        umtx_lock(NULL);
+        if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
+        {
+            fgSystemDefaultCenturyStartYear = newYear;
+            fgSystemDefaultCenturyStart = newStart;
+        }
+        umtx_unlock(NULL);
+    }
+    // We have no recourse upon failure unless we want to propagate the failure
+    // out.
+}
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
+
+U_NAMESPACE_END
+
+#endif
+