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Diffstat (limited to 'src/mscorlib/corefx/System/Globalization/HijriCalendar.cs')
| -rw-r--r-- | src/mscorlib/corefx/System/Globalization/HijriCalendar.cs | 675 |
1 files changed, 675 insertions, 0 deletions
diff --git a/src/mscorlib/corefx/System/Globalization/HijriCalendar.cs b/src/mscorlib/corefx/System/Globalization/HijriCalendar.cs new file mode 100644 index 0000000000..72d9ab3f52 --- /dev/null +++ b/src/mscorlib/corefx/System/Globalization/HijriCalendar.cs @@ -0,0 +1,675 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +using System; +using System.Runtime.Versioning; +using System.Diagnostics.Contracts; + +namespace System.Globalization +{ + //////////////////////////////////////////////////////////////////////////// + // + // Rules for the Hijri calendar: + // - The Hijri calendar is a strictly Lunar calendar. + // - Days begin at sunset. + // - Islamic Year 1 (Muharram 1, 1 A.H.) is equivalent to absolute date + // 227015 (Friday, July 16, 622 C.E. - Julian). + // - Leap Years occur in the 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, & 29th + // years of a 30-year cycle. Year = leap iff ((11y+14) mod 30 < 11). + // - There are 12 months which contain alternately 30 and 29 days. + // - The 12th month, Dhu al-Hijjah, contains 30 days instead of 29 days + // in a leap year. + // - Common years have 354 days. Leap years have 355 days. + // - There are 10,631 days in a 30-year cycle. + // - The Islamic months are: + // 1. Muharram (30 days) 7. Rajab (30 days) + // 2. Safar (29 days) 8. Sha'ban (29 days) + // 3. Rabi I (30 days) 9. Ramadan (30 days) + // 4. Rabi II (29 days) 10. Shawwal (29 days) + // 5. Jumada I (30 days) 11. Dhu al-Qada (30 days) + // 6. Jumada II (29 days) 12. Dhu al-Hijjah (29 days) {30} + // + // NOTENOTE + // The calculation of the HijriCalendar is based on the absolute date. And the + // absolute date means the number of days from January 1st, 1 A.D. + // Therefore, we do not support the days before the January 1st, 1 A.D. + // + //////////////////////////////////////////////////////////////////////////// + /* + ** Calendar support range: + ** Calendar Minimum Maximum + ** ========== ========== ========== + ** Gregorian 0622/07/18 9999/12/31 + ** Hijri 0001/01/01 9666/04/03 + */ + + [Serializable] + [System.Runtime.InteropServices.ComVisible(true)] + public partial class HijriCalendar : Calendar + { + internal static readonly int HijriEra = 1; + + internal const int DatePartYear = 0; + internal const int DatePartDayOfYear = 1; + internal const int DatePartMonth = 2; + internal const int DatePartDay = 3; + + internal const int MinAdvancedHijri = -2; + internal const int MaxAdvancedHijri = 2; + + internal static readonly int[] HijriMonthDays = { 0, 30, 59, 89, 118, 148, 177, 207, 236, 266, 295, 325, 355 }; + + private int _hijriAdvance = Int32.MinValue; + + // DateTime.MaxValue = Hijri calendar (year:9666, month: 4, day: 3). + internal const int MaxCalendarYear = 9666; + internal const int MaxCalendarMonth = 4; + internal const int MaxCalendarDay = 3; + // Hijri calendar (year: 1, month: 1, day:1 ) = Gregorian (year: 622, month: 7, day: 18) + // This is the minimal Gregorian date that we support in the HijriCalendar. + internal static readonly DateTime calendarMinValue = new DateTime(622, 7, 18); + internal static readonly DateTime calendarMaxValue = DateTime.MaxValue; + + + [System.Runtime.InteropServices.ComVisible(false)] + public override DateTime MinSupportedDateTime + { + get + { + return (calendarMinValue); + } + } + + + [System.Runtime.InteropServices.ComVisible(false)] + public override DateTime MaxSupportedDateTime + { + get + { + return (calendarMaxValue); + } + } + + public HijriCalendar() + { + } + + internal override CalendarId ID + { + get + { + return CalendarId.HIJRI; + } + } + + protected override int DaysInYearBeforeMinSupportedYear + { + get + { + // the year before the 1st year of the cycle would have been the 30th year + // of the previous cycle which is not a leap year. Common years have 354 days. + return 354; + } + } + + + + /*=================================GetAbsoluteDateHijri========================== + **Action: Gets the Absolute date for the given Hijri date. The absolute date means + ** the number of days from January 1st, 1 A.D. + **Returns: + **Arguments: + **Exceptions: + ============================================================================*/ + + private long GetAbsoluteDateHijri(int y, int m, int d) + { + return (long)(DaysUpToHijriYear(y) + HijriMonthDays[m - 1] + d - 1 - HijriAdjustment); + } + + /*=================================DaysUpToHijriYear========================== + **Action: Gets the total number of days (absolute date) up to the given Hijri Year. + ** The absolute date means the number of days from January 1st, 1 A.D. + **Returns: Gets the total number of days (absolute date) up to the given Hijri Year. + **Arguments: HijriYear year value in Hijri calendar. + **Exceptions: None + **Notes: + ============================================================================*/ + + private long DaysUpToHijriYear(int HijriYear) + { + long NumDays; // number of absolute days + int NumYear30; // number of years up to current 30 year cycle + int NumYearsLeft; // number of years into 30 year cycle + + // + // Compute the number of years up to the current 30 year cycle. + // + NumYear30 = ((HijriYear - 1) / 30) * 30; + + // + // Compute the number of years left. This is the number of years + // into the 30 year cycle for the given year. + // + NumYearsLeft = HijriYear - NumYear30 - 1; + + // + // Compute the number of absolute days up to the given year. + // + NumDays = ((NumYear30 * 10631L) / 30L) + 227013L; + while (NumYearsLeft > 0) + { + // Common year is 354 days, and leap year is 355 days. + NumDays += 354 + (IsLeapYear(NumYearsLeft, CurrentEra) ? 1 : 0); + NumYearsLeft--; + } + + // + // Return the number of absolute days. + // + return (NumDays); + } + + public int HijriAdjustment + { + get + { + if (_hijriAdvance == Int32.MinValue) + { + // Never been set before. Use the system value from registry. + _hijriAdvance = GetHijriDateAdjustment(); + } + return (_hijriAdvance); + } + + set + { + // NOTE: Check the value of Min/MaxAdavncedHijri with Arabic speakers to see if the assumption is good. + if (value < MinAdvancedHijri || value > MaxAdvancedHijri) + { + throw new ArgumentOutOfRangeException( + "HijriAdjustment", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Bounds_Lower_Upper, + MinAdvancedHijri, + MaxAdvancedHijri)); + } + Contract.EndContractBlock(); + VerifyWritable(); + + _hijriAdvance = value; + } + } + + internal static void CheckTicksRange(long ticks) + { + if (ticks < calendarMinValue.Ticks || ticks > calendarMaxValue.Ticks) + { + throw new ArgumentOutOfRangeException( + "time", + String.Format( + CultureInfo.InvariantCulture, + SR.ArgumentOutOfRange_CalendarRange, + calendarMinValue, + calendarMaxValue)); + } + } + + internal static void CheckEraRange(int era) + { + if (era != CurrentEra && era != HijriEra) + { + throw new ArgumentOutOfRangeException("era", SR.ArgumentOutOfRange_InvalidEraValue); + } + } + + internal static void CheckYearRange(int year, int era) + { + CheckEraRange(era); + if (year < 1 || year > MaxCalendarYear) + { + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Range, + 1, + MaxCalendarYear)); + } + } + + internal static void CheckYearMonthRange(int year, int month, int era) + { + CheckYearRange(year, era); + if (year == MaxCalendarYear) + { + if (month > MaxCalendarMonth) + { + throw new ArgumentOutOfRangeException( + "month", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Range, + 1, + MaxCalendarMonth)); + } + } + + if (month < 1 || month > 12) + { + throw new ArgumentOutOfRangeException("month", SR.ArgumentOutOfRange_Month); + } + } + + /*=================================GetDatePart========================== + **Action: Returns a given date part of this <i>DateTime</i>. This method is used + ** to compute the year, day-of-year, month, or day part. + **Returns: + **Arguments: + **Exceptions: ArgumentException if part is incorrect. + **Notes: + ** First, we get the absolute date (the number of days from January 1st, 1 A.C) for the given ticks. + ** Use the formula (((AbsoluteDate - 227013) * 30) / 10631) + 1, we can a rough value for the Hijri year. + ** In order to get the exact Hijri year, we compare the exact absolute date for HijriYear and (HijriYear + 1). + ** From here, we can get the correct Hijri year. + ============================================================================*/ + + internal virtual int GetDatePart(long ticks, int part) + { + int HijriYear; // Hijri year + int HijriMonth; // Hijri month + int HijriDay; // Hijri day + long NumDays; // The calculation buffer in number of days. + + CheckTicksRange(ticks); + + // + // Get the absolute date. The absolute date is the number of days from January 1st, 1 A.D. + // 1/1/0001 is absolute date 1. + // + NumDays = ticks / GregorianCalendar.TicksPerDay + 1; + + // + // See how much we need to backup or advance + // + NumDays += HijriAdjustment; + + // + // Calculate the appromixate Hijri Year from this magic formula. + // + HijriYear = (int)(((NumDays - 227013) * 30) / 10631) + 1; + + long daysToHijriYear = DaysUpToHijriYear(HijriYear); // The absoulte date for HijriYear + long daysOfHijriYear = GetDaysInYear(HijriYear, CurrentEra); // The number of days for (HijriYear+1) year. + + if (NumDays < daysToHijriYear) + { + daysToHijriYear -= daysOfHijriYear; + HijriYear--; + } + else if (NumDays == daysToHijriYear) + { + HijriYear--; + daysToHijriYear -= GetDaysInYear(HijriYear, CurrentEra); + } + else + { + if (NumDays > daysToHijriYear + daysOfHijriYear) + { + daysToHijriYear += daysOfHijriYear; + HijriYear++; + } + } + if (part == DatePartYear) + { + return (HijriYear); + } + + // + // Calculate the Hijri Month. + // + + HijriMonth = 1; + NumDays -= daysToHijriYear; + + if (part == DatePartDayOfYear) + { + return ((int)NumDays); + } + + while ((HijriMonth <= 12) && (NumDays > HijriMonthDays[HijriMonth - 1])) + { + HijriMonth++; + } + HijriMonth--; + + if (part == DatePartMonth) + { + return (HijriMonth); + } + + // + // Calculate the Hijri Day. + // + HijriDay = (int)(NumDays - HijriMonthDays[HijriMonth - 1]); + + if (part == DatePartDay) + { + return (HijriDay); + } + // Incorrect part value. + throw new InvalidOperationException(SR.InvalidOperation_DateTimeParsing); + } + + // Returns the DateTime resulting from adding the given number of + // months to the specified DateTime. The result is computed by incrementing + // (or decrementing) the year and month parts of the specified DateTime by + // value months, and, if required, adjusting the day part of the + // resulting date downwards to the last day of the resulting month in the + // resulting year. The time-of-day part of the result is the same as the + // time-of-day part of the specified DateTime. + // + // In more precise terms, considering the specified DateTime to be of the + // form y / m / d + t, where y is the + // year, m is the month, d is the day, and t is the + // time-of-day, the result is y1 / m1 / d1 + t, + // where y1 and m1 are computed by adding value months + // to y and m, and d1 is the largest value less than + // or equal to d that denotes a valid day in month m1 of year + // y1. + // + + public override DateTime AddMonths(DateTime time, int months) + { + if (months < -120000 || months > 120000) + { + throw new ArgumentOutOfRangeException( + "months", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Range, + -120000, + 120000)); + } + Contract.EndContractBlock(); + // Get the date in Hijri calendar. + int y = GetDatePart(time.Ticks, DatePartYear); + int m = GetDatePart(time.Ticks, DatePartMonth); + int d = GetDatePart(time.Ticks, DatePartDay); + int i = m - 1 + months; + if (i >= 0) + { + m = i % 12 + 1; + y = y + i / 12; + } + else + { + m = 12 + (i + 1) % 12; + y = y + (i - 11) / 12; + } + int days = GetDaysInMonth(y, m); + if (d > days) + { + d = days; + } + long ticks = GetAbsoluteDateHijri(y, m, d) * TicksPerDay + (time.Ticks % TicksPerDay); + Calendar.CheckAddResult(ticks, MinSupportedDateTime, MaxSupportedDateTime); + return (new DateTime(ticks)); + } + + // Returns the DateTime resulting from adding the given number of + // years to the specified DateTime. The result is computed by incrementing + // (or decrementing) the year part of the specified DateTime by value + // years. If the month and day of the specified DateTime is 2/29, and if the + // resulting year is not a leap year, the month and day of the resulting + // DateTime becomes 2/28. Otherwise, the month, day, and time-of-day + // parts of the result are the same as those of the specified DateTime. + // + + public override DateTime AddYears(DateTime time, int years) + { + return (AddMonths(time, years * 12)); + } + + // Returns the day-of-month part of the specified DateTime. The returned + // value is an integer between 1 and 31. + // + + public override int GetDayOfMonth(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartDay)); + } + + // Returns the day-of-week part of the specified DateTime. The returned value + // is an integer between 0 and 6, where 0 indicates Sunday, 1 indicates + // Monday, 2 indicates Tuesday, 3 indicates Wednesday, 4 indicates + // Thursday, 5 indicates Friday, and 6 indicates Saturday. + // + + public override DayOfWeek GetDayOfWeek(DateTime time) + { + return ((DayOfWeek)((int)(time.Ticks / TicksPerDay + 1) % 7)); + } + + // Returns the day-of-year part of the specified DateTime. The returned value + // is an integer between 1 and 366. + // + + public override int GetDayOfYear(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartDayOfYear)); + } + + // Returns the number of days in the month given by the year and + // month arguments. + // + [Pure] + public override int GetDaysInMonth(int year, int month, int era) + { + CheckYearMonthRange(year, month, era); + if (month == 12) + { + // For the 12th month, leap year has 30 days, and common year has 29 days. + return (IsLeapYear(year, CurrentEra) ? 30 : 29); + } + // Other months contain 30 and 29 days alternatively. The 1st month has 30 days. + return (((month % 2) == 1) ? 30 : 29); + } + + // Returns the number of days in the year given by the year argument for the current era. + // + + public override int GetDaysInYear(int year, int era) + { + CheckYearRange(year, era); + // Common years have 354 days. Leap years have 355 days. + return (IsLeapYear(year, CurrentEra) ? 355 : 354); + } + + // Returns the era for the specified DateTime value. + + public override int GetEra(DateTime time) + { + CheckTicksRange(time.Ticks); + return (HijriEra); + } + + + public override int[] Eras + { + get + { + return (new int[] { HijriEra }); + } + } + + // Returns the month part of the specified DateTime. The returned value is an + // integer between 1 and 12. + // + + public override int GetMonth(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartMonth)); + } + + // Returns the number of months in the specified year and era. + + public override int GetMonthsInYear(int year, int era) + { + CheckYearRange(year, era); + return (12); + } + + // Returns the year part of the specified DateTime. The returned value is an + // integer between 1 and MaxCalendarYear. + // + + public override int GetYear(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartYear)); + } + + // Checks whether a given day in the specified era is a leap day. This method returns true if + // the date is a leap day, or false if not. + // + + public override bool IsLeapDay(int year, int month, int day, int era) + { + // The year/month/era value checking is done in GetDaysInMonth(). + int daysInMonth = GetDaysInMonth(year, month, era); + if (day < 1 || day > daysInMonth) + { + throw new ArgumentOutOfRangeException( + "day", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Day, + daysInMonth, + month)); + } + return (IsLeapYear(year, era) && month == 12 && day == 30); + } + + // Returns the leap month in a calendar year of the specified era. This method returns 0 + // if this calendar does not have leap month, or this year is not a leap year. + // + + [System.Runtime.InteropServices.ComVisible(false)] + public override int GetLeapMonth(int year, int era) + { + CheckYearRange(year, era); + return (0); + } + + // Checks whether a given month in the specified era is a leap month. This method returns true if + // month is a leap month, or false if not. + // + + public override bool IsLeapMonth(int year, int month, int era) + { + CheckYearMonthRange(year, month, era); + return (false); + } + + // Checks whether a given year in the specified era is a leap year. This method returns true if + // year is a leap year, or false if not. + // + + public override bool IsLeapYear(int year, int era) + { + CheckYearRange(year, era); + return ((((year * 11) + 14) % 30) < 11); + } + + // Returns the date and time converted to a DateTime value. Throws an exception if the n-tuple is invalid. + // + + public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era) + { + // The year/month/era checking is done in GetDaysInMonth(). + int daysInMonth = GetDaysInMonth(year, month, era); + if (day < 1 || day > daysInMonth) + { + throw new ArgumentOutOfRangeException( + "day", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Day, + daysInMonth, + month)); + } + + long lDate = GetAbsoluteDateHijri(year, month, day); + + if (lDate >= 0) + { + return (new DateTime(lDate * GregorianCalendar.TicksPerDay + TimeToTicks(hour, minute, second, millisecond))); + } + else + { + throw new ArgumentOutOfRangeException(null, SR.ArgumentOutOfRange_BadYearMonthDay); + } + } + + private const int DEFAULT_TWO_DIGIT_YEAR_MAX = 1451; + + + public override int TwoDigitYearMax + { + get + { + if (twoDigitYearMax == -1) + { + twoDigitYearMax = GetSystemTwoDigitYearSetting(ID, DEFAULT_TWO_DIGIT_YEAR_MAX); + } + return (twoDigitYearMax); + } + + set + { + VerifyWritable(); + if (value < 99 || value > MaxCalendarYear) + { + throw new ArgumentOutOfRangeException( + "value", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Range, + 99, + MaxCalendarYear)); + } + twoDigitYearMax = value; + } + } + + + public override int ToFourDigitYear(int year) + { + if (year < 0) + { + throw new ArgumentOutOfRangeException("year", + SR.ArgumentOutOfRange_NeedNonNegNum); + } + Contract.EndContractBlock(); + + if (year < 100) + { + return (base.ToFourDigitYear(year)); + } + + if (year > MaxCalendarYear) + { + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + SR.ArgumentOutOfRange_Range, + 1, + MaxCalendarYear)); + } + return (year); + } + } +} |