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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- G N A T . C A L E N D A R --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1999-2007, AdaCore --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 2, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+package body GNAT.Calendar is
+
+ use Ada.Calendar;
+ use Interfaces;
+
+ -----------------
+ -- Day_In_Year --
+ -----------------
+
+ function Day_In_Year (Date : Time) return Day_In_Year_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Day_Secs : Day_Duration;
+ pragma Unreferenced (Day_Secs);
+ begin
+ Split (Date, Year, Month, Day, Day_Secs);
+ return Julian_Day (Year, Month, Day) - Julian_Day (Year, 1, 1) + 1;
+ end Day_In_Year;
+
+ -----------------
+ -- Day_Of_Week --
+ -----------------
+
+ function Day_Of_Week (Date : Time) return Day_Name is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Day_Secs : Day_Duration;
+ pragma Unreferenced (Day_Secs);
+ begin
+ Split (Date, Year, Month, Day, Day_Secs);
+ return Day_Name'Val ((Julian_Day (Year, Month, Day)) mod 7);
+ end Day_Of_Week;
+
+ ----------
+ -- Hour --
+ ----------
+
+ function Hour (Date : Time) return Hour_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+ pragma Unreferenced (Year, Month, Day, Minute, Second, Sub_Second);
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Hour;
+ end Hour;
+
+ ----------------
+ -- Julian_Day --
+ ----------------
+
+ -- Julian_Day is used to by Day_Of_Week and Day_In_Year. Note that this
+ -- implementation is not expensive.
+
+ function Julian_Day
+ (Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number) return Integer
+ is
+ Internal_Year : Integer;
+ Internal_Month : Integer;
+ Internal_Day : Integer;
+ Julian_Date : Integer;
+ C : Integer;
+ Ya : Integer;
+
+ begin
+ Internal_Year := Integer (Year);
+ Internal_Month := Integer (Month);
+ Internal_Day := Integer (Day);
+
+ if Internal_Month > 2 then
+ Internal_Month := Internal_Month - 3;
+ else
+ Internal_Month := Internal_Month + 9;
+ Internal_Year := Internal_Year - 1;
+ end if;
+
+ C := Internal_Year / 100;
+ Ya := Internal_Year - (100 * C);
+
+ Julian_Date := (146_097 * C) / 4 +
+ (1_461 * Ya) / 4 +
+ (153 * Internal_Month + 2) / 5 +
+ Internal_Day + 1_721_119;
+
+ return Julian_Date;
+ end Julian_Day;
+
+ ------------
+ -- Minute --
+ ------------
+
+ function Minute (Date : Time) return Minute_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+ pragma Unreferenced (Year, Month, Day, Hour, Second, Sub_Second);
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Minute;
+ end Minute;
+
+ ------------
+ -- Second --
+ ------------
+
+ function Second (Date : Time) return Second_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+ pragma Unreferenced (Year, Month, Day, Hour, Minute, Sub_Second);
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Second;
+ end Second;
+
+ -----------
+ -- Split --
+ -----------
+
+ procedure Split
+ (Date : Time;
+ Year : out Year_Number;
+ Month : out Month_Number;
+ Day : out Day_Number;
+ Hour : out Hour_Number;
+ Minute : out Minute_Number;
+ Second : out Second_Number;
+ Sub_Second : out Second_Duration)
+ is
+ Day_Secs : Day_Duration;
+ Secs : Natural;
+
+ begin
+ Split (Date, Year, Month, Day, Day_Secs);
+
+ if Day_Secs = 0.0 then
+ Secs := 0;
+ else
+ Secs := Natural (Day_Secs - 0.5);
+ end if;
+
+ Sub_Second := Second_Duration (Day_Secs - Day_Duration (Secs));
+ Hour := Hour_Number (Secs / 3_600);
+ Secs := Secs mod 3_600;
+ Minute := Minute_Number (Secs / 60);
+ Second := Second_Number (Secs mod 60);
+ end Split;
+
+ ----------------
+ -- Sub_Second --
+ ----------------
+
+ function Sub_Second (Date : Time) return Second_Duration is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+ pragma Unreferenced (Year, Month, Day, Hour, Minute, Second);
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Sub_Second;
+ end Sub_Second;
+
+ -------------
+ -- Time_Of --
+ -------------
+
+ function Time_Of
+ (Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration := 0.0) return Time
+ is
+
+ Day_Secs : constant Day_Duration :=
+ Day_Duration (Hour * 3_600) +
+ Day_Duration (Minute * 60) +
+ Day_Duration (Second) +
+ Sub_Second;
+ begin
+ return Time_Of (Year, Month, Day, Day_Secs);
+ end Time_Of;
+
+ -----------------
+ -- To_Duration --
+ -----------------
+
+ function To_Duration (T : not null access timeval) return Duration is
+
+ procedure timeval_to_duration
+ (T : not null access timeval;
+ sec : not null access C.long;
+ usec : not null access C.long);
+ pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
+
+ Micro : constant := 10**6;
+ sec : aliased C.long;
+ usec : aliased C.long;
+
+ begin
+ timeval_to_duration (T, sec'Access, usec'Access);
+ return Duration (sec) + Duration (usec) / Micro;
+ end To_Duration;
+
+ ----------------
+ -- To_Timeval --
+ ----------------
+
+ function To_Timeval (D : Duration) return timeval is
+
+ procedure duration_to_timeval
+ (Sec : C.long;
+ Usec : C.long;
+ T : not null access timeval);
+ pragma Import (C, duration_to_timeval, "__gnat_duration_to_timeval");
+
+ Micro : constant := 10**6;
+ Result : aliased timeval;
+ sec : C.long;
+ usec : C.long;
+
+ begin
+ if D = 0.0 then
+ sec := 0;
+ usec := 0;
+ else
+ sec := C.long (D - 0.5);
+ usec := C.long ((D - Duration (sec)) * Micro - 0.5);
+ end if;
+
+ duration_to_timeval (sec, usec, Result'Access);
+
+ return Result;
+ end To_Timeval;
+
+ ------------------
+ -- Week_In_Year --
+ ------------------
+
+ function Week_In_Year (Date : Time) return Week_In_Year_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+ Jan_1 : Day_Name;
+ Shift : Week_In_Year_Number;
+ Start_Week : Week_In_Year_Number;
+
+ pragma Unreferenced (Hour, Minute, Second, Sub_Second);
+
+ function Is_Leap (Year : Year_Number) return Boolean;
+ -- Return True if Year denotes a leap year. Leap centential years are
+ -- properly handled.
+
+ function Jan_1_Day_Of_Week
+ (Jan_1 : Day_Name;
+ Year : Year_Number;
+ Last_Year : Boolean := False;
+ Next_Year : Boolean := False) return Day_Name;
+ -- Given the weekday of January 1 in Year, determine the weekday on
+ -- which January 1 fell last year or will fall next year as set by
+ -- the two flags. This routine does not call Time_Of or Split.
+
+ function Last_Year_Has_53_Weeks
+ (Jan_1 : Day_Name;
+ Year : Year_Number) return Boolean;
+ -- Given the weekday of January 1 in Year, determine whether last year
+ -- has 53 weeks. A False value implies that the year has 52 weeks.
+
+ -------------
+ -- Is_Leap --
+ -------------
+
+ function Is_Leap (Year : Year_Number) return Boolean is
+ begin
+ if Year mod 400 = 0 then
+ return True;
+ elsif Year mod 100 = 0 then
+ return False;
+ else
+ return Year mod 4 = 0;
+ end if;
+ end Is_Leap;
+
+ -----------------------
+ -- Jan_1_Day_Of_Week --
+ -----------------------
+
+ function Jan_1_Day_Of_Week
+ (Jan_1 : Day_Name;
+ Year : Year_Number;
+ Last_Year : Boolean := False;
+ Next_Year : Boolean := False) return Day_Name
+ is
+ Shift : Integer := 0;
+
+ begin
+ if Last_Year then
+ if Is_Leap (Year - 1) then
+ Shift := -2;
+ else
+ Shift := -1;
+ end if;
+
+ elsif Next_Year then
+ if Is_Leap (Year) then
+ Shift := 2;
+ else
+ Shift := 1;
+ end if;
+ end if;
+
+ return Day_Name'Val ((Day_Name'Pos (Jan_1) + Shift) mod 7);
+ end Jan_1_Day_Of_Week;
+
+ ----------------------------
+ -- Last_Year_Has_53_Weeks --
+ ----------------------------
+
+ function Last_Year_Has_53_Weeks
+ (Jan_1 : Day_Name;
+ Year : Year_Number) return Boolean
+ is
+ Last_Jan_1 : constant Day_Name :=
+ Jan_1_Day_Of_Week (Jan_1, Year, Last_Year => True);
+ begin
+ -- These two cases are illustrated in the table below
+
+ return
+ Last_Jan_1 = Thursday
+ or else
+ (Last_Jan_1 = Wednesday
+ and then Is_Leap (Year - 1));
+ end Last_Year_Has_53_Weeks;
+
+ -- Start of processing for Week_In_Year
+
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+
+ -- According to ISO 8601, the first week of year Y is the week that
+ -- contains the first Thursday in year Y. The following table contains
+ -- all possible combinations of years and weekdays along with examples.
+
+ -- +-------+------+-------+---------+
+ -- | Jan 1 | Leap | Weeks | Example |
+ -- +-------+------+-------+---------+
+ -- | Mon | No | 52 | 2007 |
+ -- +-------+------+-------+---------+
+ -- | Mon | Yes | 52 | 1996 |
+ -- +-------+------+-------+---------+
+ -- | Tue | No | 52 | 2002 |
+ -- +-------+------+-------+---------+
+ -- | Tue | Yes | 52 | 1980 |
+ -- +-------+------+-------+---------+
+ -- | Wed | No | 52 | 2003 |
+ -- +-------+------#########---------+
+ -- | Wed | Yes # 53 # 1992 |
+ -- +-------+------#-------#---------+
+ -- | Thu | No # 53 # 1998 |
+ -- +-------+------#-------#---------+
+ -- | Thu | Yes # 53 # 2004 |
+ -- +-------+------#########---------+
+ -- | Fri | No | 52 | 1999 |
+ -- +-------+------+-------+---------+
+ -- | Fri | Yes | 52 | 1988 |
+ -- +-------+------+-------+---------+
+ -- | Sat | No | 52 | 1994 |
+ -- +-------+------+-------+---------+
+ -- | Sat | Yes | 52 | 1972 |
+ -- +-------+------+-------+---------+
+ -- | Sun | No | 52 | 1995 |
+ -- +-------+------+-------+---------+
+ -- | Sun | Yes | 52 | 1956 |
+ -- +-------+------+-------+---------+
+
+ -- A small optimization, the input date is January 1. Note that this
+ -- is a key day since it determines the number of weeks and is used
+ -- when special casing the first week of January and the last week of
+ -- December.
+
+ if Day = 1
+ and then Month = 1
+ then
+ Jan_1 := Day_Of_Week (Date);
+ else
+ Jan_1 := Day_Of_Week (Time_Of (Year, 1, 1, 0.0));
+ end if;
+
+ if Month = 1 then
+
+ -- Special case 1: January 1, 2 and 3. These three days may belong
+ -- to last year's last week which can be week number 52 or 53.
+
+ -- +-----+-----+-----+=====+-----+-----+-----+
+ -- | Mon | Tue | Wed # Thu # Fri | Sat | Sun |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 26 | 27 | 28 # 29 # 30 | 31 | 1 |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 27 | 28 | 29 # 30 # 31 | 1 | 2 |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 28 | 29 | 30 # 31 # 1 | 2 | 3 |
+ -- +-----+-----+-----+=====+-----+-----+-----+
+
+ if (Day = 1 and then Jan_1 in Friday .. Sunday)
+ or else
+ (Day = 2 and then Jan_1 in Friday .. Saturday)
+ or else
+ (Day = 3 and then Jan_1 = Friday)
+ then
+ if Last_Year_Has_53_Weeks (Jan_1, Year) then
+ return 53;
+ else
+ return 52;
+ end if;
+
+ -- Special case 2: January 1, 2, 3, 4, 5 and 6 of the first week. In
+ -- this scenario January 1 does not fall on a Monday.
+
+ -- +-----+-----+-----+=====+-----+-----+-----+
+ -- | Mon | Tue | Wed # Thu # Fri | Sat | Sun |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 29 | 30 | 31 # 1 # 2 | 3 | 4 |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 30 | 31 | 1 # 2 # 3 | 4 | 5 |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 31 | 1 | 2 # 3 # 4 | 5 | 6 |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+
+ elsif (Day <= 4 and then Jan_1 in Tuesday .. Thursday)
+ or else
+ (Day = 5 and then Jan_1 in Tuesday .. Wednesday)
+ or else
+ (Day = 6 and then Jan_1 = Tuesday)
+ then
+ return 1;
+ end if;
+
+ -- Special case 3: December 29, 30 and 31. These days may belong to
+ -- next year's first week.
+
+ -- +-----+-----+-----+=====+-----+-----+-----+
+ -- | Mon | Tue | Wed # Thu # Fri | Sat | Sun |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 29 | 30 | 31 # 1 # 2 | 3 | 4 |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 30 | 31 | 1 # 2 # 3 | 4 | 5 |
+ -- +-----+-----+-----+-----+-----+-----+-----+
+ -- | 31 | 1 | 2 # 3 # 4 | 5 | 6 |
+ -- +-----+-----+-----+=====+-----+-----+-----+
+
+ elsif Month = 12
+ and then Day > 28
+ then
+ declare
+ Next_Jan_1 : constant Day_Name :=
+ Jan_1_Day_Of_Week (Jan_1, Year, Next_Year => True);
+ begin
+ if (Day = 29 and then Next_Jan_1 = Thursday)
+ or else
+ (Day = 30 and then Next_Jan_1 in Wednesday .. Thursday)
+ or else
+ (Day = 31 and then Next_Jan_1 in Tuesday .. Thursday)
+ then
+ return 1;
+ end if;
+ end;
+ end if;
+
+ -- Determine the week from which to start counting. If January 1 does
+ -- not belong to the first week of the input year, then the next week
+ -- is the first week.
+
+ if Jan_1 in Friday .. Sunday then
+ Start_Week := 1;
+ else
+ Start_Week := 2;
+ end if;
+
+ -- At this point all special combinations have been accounted for and
+ -- the proper start week has been found. Since January 1 may not fall
+ -- on a Monday, shift 7 - Day_Name'Pos (Jan_1). This action ensures an
+ -- origin which falls on Monday.
+
+ Shift := 7 - Day_Name'Pos (Jan_1);
+ return Start_Week + (Day_In_Year (Date) - Shift - 1) / 7;
+ end Week_In_Year;
+
+end GNAT.Calendar;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 08:11:48 +0000