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TextFile

separate (Towers_Of_Hanoi_Rules_For_Graphic)
package body Reformulating_Guru_Rule is  
    Decision_Table : constant array (1 .. 3, 1 .. 3) of Integer :=
       (1 => (3, 3, 2), 2 => (3, 3, 1), 3 => (2, 1, 1));

    One : constant Slot.Object := Slot.Value (1);

    function Other_Tower_Than
                (First, Second : Slot.Object) return Slot.Object is
        Other : Integer;
    begin
        Other := Decision_Table (Slot.Get (First), Slot.Get (Second));
        return Slot.Value (Other);
    end Other_Tower_Than;

    function More_Urgent (Than : Slot.Object) return Slot.Object is  
        use Slot.Operators;
    begin
        return Than + One;
    end More_Urgent;

    function Premiss return Fact_Queries is
        The_Priority : constant Alias.Name := Alias.P;
    begin
        return (Movements.Exist ((Count => Is_Greater (1),  
                                  Priority => Define_As (The_Priority),
                                  From_Tower | To_Tower => Is_Any)),

                Movements.Absent ((Priority => Is_Greater (The_Priority),
                                   From_Tower | To_Tower | Count => Is_Any)));
    end Premiss;

    procedure Action (The_Facts : Fact_Collection) is
        The_Movement : Fact_Name renames The_Facts (1);
        The_Source, The_Destination, The_Count, The_Priority : Slot.Object;
        Move_First, Move_Second, Move_Third : Slot.Object;
        The_Other_Tower : Slot.Object;
        use Slot.Operators;
    begin
        The_Source      := Movements.Get (The_Movement, From_Tower);
        The_Destination := Movements.Get (The_Movement, To_Tower);
        The_Count       := Movements.Get (The_Movement, Count);
        The_Priority    := Movements.Get (The_Movement, Priority);

        Move_Third  := More_Urgent (Than => The_Priority);
        Move_Second := More_Urgent (Than => Move_Third);
        Move_First  := More_Urgent (Than => Move_Second);

        The_Other_Tower := Other_Tower_Than (The_Source, The_Destination);
        Movements.Add ((Priority   => Move_First,
                        From_Tower => The_Source,
                        To_Tower   => The_Other_Tower,
                        Count      => The_Count - One));


        Movements.Add ((Priority   => Move_Second,
                        From_Tower => The_Source,
                        To_Tower   => The_Destination,
                        Count      => One));

        Movements.Add ((Priority   => Move_Third,
                        From_Tower => The_Other_Tower,
                        To_Tower   => The_Destination,
                        Count      => The_Count - One));
        Movements.Delete (The_Movement);
    end Action;

end Reformulating_Guru_Rule;