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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--              A D A . C A L E N D A R . F O R M A T T I N G               --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 2006-2010, Free Software Foundation, Inc.         --

--                                                                          --

-- 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Ada.Calendar;            use Ada.Calendar;

with Ada.Calendar.Time_Zones; use Ada.Calendar.Time_Zones;

package body Ada.Calendar.Formatting is

   --------------------------

   -- Implementation Notes --

   --------------------------

   --  All operations in this package are target and time representation

   --  independent, thus only one source file is needed for multiple targets.

   procedure Check_Char (S : String; C : Character; Index : Integer);

   --  Subsidiary to the two versions of Value. Determine whether the input

   --  string S has character C at position Index. Raise Constraint_Error if

   --  there is a mismatch.

   procedure Check_Digit (S : String; Index : Integer);

   --  Subsidiary to the two versions of Value. Determine whether the character

   --  of string S at position Index is a digit. This catches invalid input

   --  such as 1983-*1-j3 u5:n7:k9 which should be 1983-01-03 05:07:09. Raise

   --  Constraint_Error if there is a mismatch.

   ----------------

   -- Check_Char --

   ----------------

   procedure Check_Char (S : String; C : Character; Index : Integer) is

   begin

      if S (Index) /= C then

         raise Constraint_Error;

      end if;

   end Check_Char;

   -----------------

   -- Check_Digit --

   -----------------

   procedure Check_Digit (S : String; Index : Integer) is

   begin

      if S (Index) not in '0' .. '9' then

         raise Constraint_Error;

      end if;

   end Check_Digit;

   ---------

   -- Day --

   ---------

   function Day

     (Date      : Time;

      Time_Zone : Time_Zones.Time_Offset := 0) return Day_Number

   is

      Y  : Year_Number;

      Mo : Month_Number;

      D  : Day_Number;

      H  : Hour_Number;

      Mi : Minute_Number;

      Se : Second_Number;

      Ss : Second_Duration;

      Le : Boolean;

      pragma Unreferenced (Y, Mo, H, Mi);

   begin

      Split (Date, Y, Mo, D, H, Mi, Se, Ss, Le, Time_Zone);

      return D;

   end Day;

   -----------------

   -- Day_Of_Week --

   -----------------

   function Day_Of_Week (Date : Time) return Day_Name is

   begin

      return Day_Name'Val (Formatting_Operations.Day_Of_Week (Date));

   end Day_Of_Week;

   ----------

   -- Hour --

   ----------

   function Hour

     (Date      : Time;

      Time_Zone : Time_Zones.Time_Offset := 0) return Hour_Number

   is

      Y  : Year_Number;

      Mo : Month_Number;

      D  : Day_Number;

      H  : Hour_Number;

      Mi : Minute_Number;

      Se : Second_Number;

      Ss : Second_Duration;

      Le : Boolean;

      pragma Unreferenced (Y, Mo, D, Mi);

   begin

      Split (Date, Y, Mo, D, H, Mi, Se, Ss, Le, Time_Zone);

      return H;

   end Hour;

   -----------

   -- Image --

   -----------

   function Image

     (Elapsed_Time          : Duration;

      Include_Time_Fraction : Boolean := False) return String

   is

      To_Char    : constant array (0 .. 9) of Character := "0123456789";

      Hour       : Hour_Number;

      Minute     : Minute_Number;

      Second     : Second_Number;

      Sub_Second : Duration;

      SS_Nat     : Natural;

      --  Determine the two slice bounds for the result string depending on

      --  whether the input is negative and whether fractions are requested.

      First  : constant Integer := (if Elapsed_Time < 0.0 then 1 else 2);

      Last   : constant Integer := (if Include_Time_Fraction then 12 else 9);

      Result : String := "-00:00:00.00";

   begin

      Split (abs (Elapsed_Time), Hour, Minute, Second, Sub_Second);

      --  Hour processing, positions 2 and 3

      Result (2) := To_Char (Hour / 10);

      Result (3) := To_Char (Hour mod 10);

      --  Minute processing, positions 5 and 6

      Result (5) := To_Char (Minute / 10);

      Result (6) := To_Char (Minute mod 10);

      --  Second processing, positions 8 and 9

      Result (8) := To_Char (Second / 10);

      Result (9) := To_Char (Second mod 10);

      --  Optional sub second processing, positions 11 and 12

      if Include_Time_Fraction and then Sub_Second > 0.0 then

         --  Prevent rounding up when converting to natural, avoiding the zero

         --  case to prevent rounding down to a negative number.

         SS_Nat := Natural (Duration'(Sub_Second * 100.0) - 0.5);

         Result (11) := To_Char (SS_Nat / 10);

         Result (12) := To_Char (SS_Nat mod 10);

      end if;

      return Result (First .. Last);

   end Image;

   -----------

   -- Image --

   -----------

   function Image

     (Date                  : Time;

      Include_Time_Fraction : Boolean := False;

      Time_Zone             : Time_Zones.Time_Offset := 0) return String

   is

      To_Char : constant array (0 .. 9) of Character := "0123456789";

      Year        : Year_Number;

      Month       : Month_Number;

      Day         : Day_Number;

      Hour        : Hour_Number;

      Minute      : Minute_Number;

      Second      : Second_Number;

      Sub_Second  : Duration;

      SS_Nat      : Natural;

      Leap_Second : Boolean;

      --  The result length depends on whether fractions are requested.

      Result : String := "0000-00-00 00:00:00.00";

      Last   : constant Positive :=

                 Result'Last - (if Include_Time_Fraction then 0 else 3);

   begin

      Split (Date, Year, Month, Day,

             Hour, Minute, Second, Sub_Second, Leap_Second, Time_Zone);

      --  Year processing, positions 1, 2, 3 and 4

      Result (1) := To_Char (Year / 1000);

      Result (2) := To_Char (Year / 100 mod 10);

      Result (3) := To_Char (Year / 10 mod 10);

      Result (4) := To_Char (Year mod 10);

      --  Month processing, positions 6 and 7

      Result (6) := To_Char (Month / 10);

      Result (7) := To_Char (Month mod 10);

      --  Day processing, positions 9 and 10

      Result (9)  := To_Char (Day / 10);

      Result (10) := To_Char (Day mod 10);

      Result (12) := To_Char (Hour / 10);

      Result (13) := To_Char (Hour mod 10);

      --  Minute processing, positions 15 and 16

      Result (15) := To_Char (Minute / 10);

      Result (16) := To_Char (Minute mod 10);

      --  Second processing, positions 18 and 19

      Result (18) := To_Char (Second / 10);

      Result (19) := To_Char (Second mod 10);

      --  Optional sub second processing, positions 21 and 22

      if Include_Time_Fraction and then Sub_Second > 0.0 then

         --  Prevent rounding up when converting to natural, avoiding the zero

         --  case to prevent rounding down to a negative number.

         SS_Nat := Natural (Duration'(Sub_Second * 100.0) - 0.5);

         Result (21) := To_Char (SS_Nat / 10);

         Result (22) := To_Char (SS_Nat mod 10);

      end if;

      return Result (Result'First .. Last);

   end Image;

   ------------

   -- Minute --

   ------------

   function Minute

     (Date      : Time;

      Time_Zone : Time_Zones.Time_Offset := 0) return Minute_Number

   is

      Y  : Year_Number;

      Mo : Month_Number;

      D  : Day_Number;

      H  : Hour_Number;

      Mi : Minute_Number;

      Se : Second_Number;

      Ss : Second_Duration;

      Le : Boolean;

      pragma Unreferenced (Y, Mo, D, H);

   begin

      Split (Date, Y, Mo, D, H, Mi, Se, Ss, Le, Time_Zone);

      return Mi;

   end Minute;

   -----------

   -- Month --

   -----------

   function Month

     (Date      : Time;

      Time_Zone : Time_Zones.Time_Offset := 0) return Month_Number

   is

      Y  : Year_Number;

      Mo : Month_Number;

      D  : Day_Number;

      H  : Hour_Number;

      Mi : Minute_Number;

      Se : Second_Number;

      Ss : Second_Duration;

      Le : Boolean;

      pragma Unreferenced (Y, D, H, Mi);

   begin

      Split (Date, Y, Mo, D, H, Mi, Se, Ss, Le, Time_Zone);

      return Mo;

   end Month;

   ------------

   -- Second --

   ------------

   function Second (Date : Time) return Second_Number is

      Y  : Year_Number;

      Mo : Month_Number;

      D  : Day_Number;

      H  : Hour_Number;

      Mi : Minute_Number;

      Se : Second_Number;

      Ss : Second_Duration;

      Le : Boolean;

      pragma Unreferenced (Y, Mo, D, H, Mi);

   begin

      Split (Date, Y, Mo, D, H, Mi, Se, Ss, Le);

      return Se;

   end Second;

   ----------------

   -- Seconds_Of --

   ----------------

   function Seconds_Of

     (Hour       : Hour_Number;

      Minute     : Minute_Number;

      Second     : Second_Number := 0;

      Sub_Second : Second_Duration := 0.0) return Day_Duration is

   begin

      --  Validity checks

      if        not Hour'Valid

        or else not Minute'Valid

        or else not Second'Valid

        or else not Sub_Second'Valid

      then

         raise Constraint_Error;

      end if;

      return Day_Duration (Hour   * 3_600) +

             Day_Duration (Minute *    60) +

             Day_Duration (Second)         +

             Sub_Second;

   end Seconds_Of;

   -----------

   -- Split --

   -----------

   procedure Split

     (Seconds    : Day_Duration;

      Hour       : out Hour_Number;

      Minute     : out Minute_Number;

      Second     : out Second_Number;

      Sub_Second : out Second_Duration)

   is

      Secs : Natural;

   begin

      --  Validity checks

      if not Seconds'Valid then

         raise Constraint_Error;

      end if;

      Secs := (if Seconds = 0.0 then 0 else Natural (Seconds - 0.5));

      Sub_Second := Second_Duration (Seconds - 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);

      --  Validity checks

      if not Hour'Valid

        or else not Minute'Valid

        or else not Second'Valid

        or else not Sub_Second'Valid

      then

         raise Time_Error;

      end if;

   end Split;

   -----------

   -- Split --

   -----------

   procedure Split

     (Date        : Time;

      Year        : out Year_Number;

      Month       : out Month_Number;

      Day         : out Day_Number;

      Seconds     : out Day_Duration;

      Leap_Second : out Boolean;

      Time_Zone   : Time_Zones.Time_Offset := 0)

   is

      H  : Integer;

      M  : Integer;

      Se : Integer;

      Su : Duration;

      Tz : constant Long_Integer := Long_Integer (Time_Zone);

   begin

      Formatting_Operations.Split

        (Date      => Date,

         Year      => Year,

         Month     => Month,

         Day       => Day,

         Day_Secs  => Seconds,

         Hour      => H,

         Minute    => M,

         Second    => Se,

         Sub_Sec   => Su,

         Leap_Sec  => Leap_Second,

         Time_Zone => Tz,

         Is_Ada_05 => True);

      --  Validity checks

      if not Year'Valid

        or else not Month'Valid

        or else not Day'Valid

        or else not Seconds'Valid

      then

         raise Time_Error;

      end if;

   end Split;

   -----------

   -- 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;

      Time_Zone  : Time_Zones.Time_Offset := 0)

   is

      Dd : Day_Duration;

      Le : Boolean;

      Tz : constant Long_Integer := Long_Integer (Time_Zone);

   begin

      Formatting_Operations.Split

        (Date      => Date,

         Year      => Year,

         Month     => Month,

         Day       => Day,

         Day_Secs  => Dd,

         Hour      => Hour,

         Minute    => Minute,

         Second    => Second,

         Sub_Sec   => Sub_Second,

         Leap_Sec  => Le,

         Time_Zone => Tz,

         Is_Ada_05 => True);

      --  Validity checks

      if not Year'Valid

        or else not Month'Valid

        or else not Day'Valid

        or else not Hour'Valid

        or else not Minute'Valid

        or else not Second'Valid

        or else not Sub_Second'Valid

      then

         raise Time_Error;

      end if;

   end Split;

   -----------

   -- 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;

      Leap_Second : out Boolean;

      Time_Zone   : Time_Zones.Time_Offset := 0)

   is

      Dd : Day_Duration;

      Tz : constant Long_Integer := Long_Integer (Time_Zone);

   begin

      Formatting_Operations.Split

       (Date      => Date,

        Year      => Year,

        Month     => Month,

        Day       => Day,

        Day_Secs  => Dd,

        Hour      => Hour,

        Minute    => Minute,

        Second    => Second,

        Sub_Sec   => Sub_Second,

        Leap_Sec  => Leap_Second,

        Time_Zone => Tz,

        Is_Ada_05 => True);

      --  Validity checks

      if not Year'Valid

        or else not Month'Valid

        or else not Day'Valid

        or else not Hour'Valid

        or else not Minute'Valid

        or else not Second'Valid

        or else not Sub_Second'Valid

      then

         raise Time_Error;

      end if;

   end Split;

   ----------------

   -- Sub_Second --

   ----------------

   function Sub_Second (Date : Time) return Second_Duration is

      Y  : Year_Number;

      Mo : Month_Number;

      D  : Day_Number;

      H  : Hour_Number;

      Mi : Minute_Number;

      Se : Second_Number;

      Ss : Second_Duration;

      Le : Boolean;

      pragma Unreferenced (Y, Mo, D, H, Mi);

   begin

      Split (Date, Y, Mo, D, H, Mi, Se, Ss, Le);

      return Ss;

   end Sub_Second;

   -------------

   -- Time_Of --

   -------------

   function Time_Of

     (Year        : Year_Number;

      Month       : Month_Number;

      Day         : Day_Number;

      Seconds     : Day_Duration := 0.0;

      Leap_Second : Boolean := False;

      Time_Zone   : Time_Zones.Time_Offset := 0) return Time

   is

      Adj_Year  : Year_Number  := Year;

      Adj_Month : Month_Number := Month;

      Adj_Day   : Day_Number   := Day;

      H  : constant Integer := 1;

      M  : constant Integer := 1;

      Se : constant Integer := 1;

      Ss : constant Duration := 0.1;

      Tz : constant Long_Integer := Long_Integer (Time_Zone);

   begin

      --  Validity checks

      if not Year'Valid

        or else not Month'Valid

        or else not Day'Valid

        or else not Seconds'Valid

        or else not Time_Zone'Valid

      then

         raise Constraint_Error;

      end if;

      --  A Seconds value of 86_400 denotes a new day. This case requires an

      --  adjustment to the input values.

      if Seconds = 86_400.0 then

         if Day < Days_In_Month (Month)

           or else (Is_Leap (Year)

                      and then Month = 2)

         then

            Adj_Day := Day + 1;

         else

            Adj_Day := 1;

            if Month < 12 then

               Adj_Month := Month + 1;

            else

               Adj_Month := 1;

               Adj_Year  := Year + 1;

            end if;

         end if;

      end if;

      return

        Formatting_Operations.Time_Of

          (Year         => Adj_Year,

           Month        => Adj_Month,

           Day          => Adj_Day,

           Day_Secs     => Seconds,

           Hour         => H,

           Minute       => M,

           Second       => Se,

           Sub_Sec      => Ss,

           Leap_Sec     => Leap_Second,

           Use_Day_Secs => True,

           Is_Ada_05    => True,

           Time_Zone    => Tz);

   end Time_Of;

   -------------

   -- 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;

      Leap_Second : Boolean := False;

      Time_Zone   : Time_Zones.Time_Offset := 0) return Time

   is

      Dd : constant Day_Duration := Day_Duration'First;

      Tz : constant Long_Integer := Long_Integer (Time_Zone);

   begin

      --  Validity checks

      if not Year'Valid

        or else not Month'Valid

        or else not Day'Valid

        or else not Hour'Valid

        or else not Minute'Valid

        or else not Second'Valid

        or else not Sub_Second'Valid

        or else not Time_Zone'Valid

      then

         raise Constraint_Error;

      end if;

      return

        Formatting_Operations.Time_Of

          (Year         => Year,

           Month        => Month,

           Day          => Day,

           Day_Secs     => Dd,

           Hour         => Hour,

           Minute       => Minute,

           Second       => Second,

           Sub_Sec      => Sub_Second,

           Leap_Sec     => Leap_Second,

           Use_Day_Secs => False,

           Is_Ada_05    => True,

           Time_Zone    => Tz);

   end Time_Of;

   -----------

   -- Value --

   -----------

   function Value

     (Date      : String;

      Time_Zone : Time_Zones.Time_Offset := 0) return Time

   is

      D          : String (1 .. 22);

      Year       : Year_Number;

      Month      : Month_Number;

      Day        : Day_Number;

      Hour       : Hour_Number;

      Minute     : Minute_Number;

      Second     : Second_Number;

      Sub_Second : Second_Duration := 0.0;

   begin

      --  Validity checks

      if not Time_Zone'Valid then

         raise Constraint_Error;

      end if;

      --  Length checks

      if Date'Length /= 19

        and then Date'Length /= 22

      then

         raise Constraint_Error;

      end if;

      --  After the correct length has been determined, it is safe to copy the

      --  Date in order to avoid Date'First + N indexing.

      D (1 .. Date'Length) := Date;

      --  Format checks

      Check_Char (D, '-', 5);

      Check_Char (D, '-', 8);

      Check_Char (D, ' ', 11);

      Check_Char (D, ':', 14);

      Check_Char (D, ':', 17);

      if Date'Length = 22 then

         Check_Char (D, '.', 20);

      end if;

      --  Leading zero checks

      Check_Digit (D, 6);

      Check_Digit (D, 9);

      Check_Digit (D, 12);

      Check_Digit (D, 15);

      Check_Digit (D, 18);

      if Date'Length = 22 then

         Check_Digit (D, 21);

      end if;

      --  Value extraction

      Year   := Year_Number   (Year_Number'Value   (D (1 .. 4)));

      Month  := Month_Number  (Month_Number'Value  (D (6 .. 7)));

      Day    := Day_Number    (Day_Number'Value    (D (9 .. 10)));

      Hour   := Hour_Number   (Hour_Number'Value   (D (12 .. 13)));

      Minute := Minute_Number (Minute_Number'Value (D (15 .. 16)));

      Second := Second_Number (Second_Number'Value (D (18 .. 19)));

      --  Optional part

      if Date'Length = 22 then

         Sub_Second := Second_Duration (Second_Duration'Value (D (20 .. 22)));

      end if;

      --  Sanity checks

      if not Year'Valid

        or else not Month'Valid

        or else not Day'Valid

        or else not Hour'Valid

        or else not Minute'Valid

        or else not Second'Valid

        or else not Sub_Second'Valid

      then

         raise Constraint_Error;

      end if;

      return Time_Of (Year, Month, Day,

                      Hour, Minute, Second, Sub_Second, False, Time_Zone);

   exception

      when others => raise Constraint_Error;

   end Value;

   -----------

   -- Value --

   -----------

   function Value (Elapsed_Time : String) return Duration is

      D          : String (1 .. 11);

      Hour       : Hour_Number;

      Minute     : Minute_Number;