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function Four_Digit_Image (Value : Integer) return Atom
is ((1 => Character'Pos ('0') + Octet (Value / 1000),
2 => Character'Pos ('0') + Octet ((Value / 100) mod 10),
3 => Character'Pos ('0') + Octet ((Value / 10) mod 10),
4 => Character'Pos ('0') + Octet (Value mod 10)))
with Pre => Value in 0 .. 9999;
function Parse_Time_Offset
(Image : in String;
Date : in Ada.Calendar.Time)
return Ada.Calendar.Time_Zones.Time_Offset;
procedure Render_Triplet
(Output : in out Ada.Streams.Root_Stream_Type'Class;
Part_1, Part_2, Part_3 : in Atom;
Template : in out Lockable.Descriptor'Class);
procedure Interpreter is new Interpreter_Loop
(Ada.Streams.Root_Stream_Type'Class, Split_Time, Execute, Append);
------------------------------
-- Local Helper Subprograms --
------------------------------
function Parse_Time_Offset
(Image : in String;
Date : in Ada.Calendar.Time)
return Ada.Calendar.Time_Zones.Time_Offset
is
function Value (C : Character)
return Ada.Calendar.Time_Zones.Time_Offset;
function Value (C : Character)
return Ada.Calendar.Time_Zones.Time_Offset is
begin
if C in '0' .. '9' then
return Ada.Calendar.Time_Zones.Time_Offset
(Character'Pos (C) - Character'Pos ('0'));
else
raise Constraint_Error with "Unknown time offset format";
end if;
end Value;
begin
if Image = "system" then
return Ada.Calendar.Time_Zones.UTC_Time_Offset (Date);
end if;
Abbreviation :
begin
return Ada.Calendar.Time_Zones.Time_Offset
(Static_Maps.S_Expressions.Templates.Dates.To_Time_Offset (Image));
exception
when Constraint_Error => null;
end Abbreviation;
Numeric :
declare
use type Ada.Calendar.Time_Zones.Time_Offset;
First : Integer := Image'First;
Length : Natural := Image'Length;
V : Ada.Calendar.Time_Zones.Time_Offset;
Negative : Boolean := False;
begin
if First in Image'Range and then Image (First) in '-' | '+' then
Negative := Image (First) = '-';
First := First + 1;
Length := Length - 1;
end if;
case Length is
when 1 =>
V := Value (Image (First)) * 60;
when 2 =>
V := Value (Image (First)) * 600
+ Value (Image (First + 1)) * 60;
when 4 =>
V := Value (Image (First)) * 600
+ Value (Image (First + 1)) * 60
+ Value (Image (First + 2)) * 10
+ Value (Image (First + 3));
when 5 =>
if Image (First + 2) in '0' .. '9' then
raise Constraint_Error with "Unknown time offset format";
end if;
V := Value (Image (First)) * 600
+ Value (Image (First + 1)) * 60
+ Value (Image (First + 3)) * 10
+ Value (Image (First + 4));
when others =>
raise Constraint_Error with "Unknown time offset format";
end case;
if Negative then
return -V;
else
return V;
end if;
end Numeric;
end Parse_Time_Offset;
procedure Render_Triplet
(Output : in out Ada.Streams.Root_Stream_Type'Class;
Part_1, Part_2, Part_3 : in Atom;
Template : in out Lockable.Descriptor'Class) is
begin
Output.Write (Part_1);
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when Commands.RFC_3339 =>
Output.Write (To_Atom
(Time_IO.RFC_3339.Image (Value.Source, Value.Time_Zone)));
when Commands.Second =>
Format.Set_Image (-1, Null_Atom);
Integers.Render (Output, Format, Arguments, Value.Second);
when Commands.With_Offset =>
if Arguments.Current_Event = Events.Add_Atom then
declare
use type Ada.Calendar.Time_Zones.Time_Offset;
New_Offset : Ada.Calendar.Time_Zones.Time_Offset;
begin
begin
New_Offset := Parse_Time_Offset
(S_Expressions.To_String (Arguments.Current_Atom),
Value.Source);
exception
when Constraint_Error => return;
end;
Arguments.Next;
if New_Offset = Value.Time_Zone then
Interpreter (Arguments, Output, Value);
else
Render (Output, Arguments, Value.Source, New_Offset);
end if;
end;
end if;
when Commands.Year =>
Integers.Render (Output, Arguments, Value.Year);
end case;
end Execute;
procedure Interpreter is new Interpreter_Loop
(Ada.Streams.Root_Stream_Type'Class, Split_Time, Execute, Append);
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