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    Types: TextFile
    Names: »B«

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TextFile

with Application;
with Attribute;
with Condition;
with Do_Action;
with Fact;
with Some_Frames;
with Text_Io;

use Attribute;
use Condition;
use Some_Frames;

procedure Test_Rule_Base is
    use Fact;  
    function Firable_On_Facts return Fact.Collection
        renames Application.Rule_Base.Firable_On_Facts;

    function Firable_On_Rule return Application.Rule_Base.Rule_Id
        renames Application.Rule_Base.Firable_On_Rule;

    procedure Load_Initial_Working_Memory is
    begin
        Robots.Add ((Colour => Green, State => Free));
        Robots.Add ((Colour => Red, State => Busy));
        Robots.Add ((Colour => Red, State => Free));
        Robots.Add ((Colour => Blue, State => Free));
        Robots.Add ((Colour => Green, State => Busy));

        Balls.Add ((Size => 50, Colour => Blue, Place => On_Heap));
        Balls.Add ((Size => 75, Colour => Green, Place => On_Heap));
        Balls.Add ((Size => 95, Colour => Red, Place => On_Heap));
        Balls.Add ((Size => 100, Colour => Blue, Place => On_Heap));

        Boxes.Add ((Size => 750, Colour => Red, State => Free));
        Boxes.Add ((Size => 10000, Colour => Green, State => Free));
        Boxes.Add ((Size => 150, Colour => Red, State => Busy));
    end Load_Initial_Working_Memory;

    procedure Dump_Working_Memory is  
        Facts : constant Fact.Collection :=
           Fact.Find (Pattern'(1 .. Max_Slots => Is_Any));
    begin
        Text_Io.Put_Line ("---> the working memory now contains " &
                          Integer'Image (Facts'Length) & " facts");
        Fact.Put (Facts);
    end Dump_Working_Memory;

begin
    Load_Initial_Working_Memory;
    loop
        declare
            Result : constant Fact.Collection := Firable_On_Facts;
        begin
            if Result /= Empty_Collection then
                Do_Action (For_Rule => Firable_On_Rule, On_Facts => Result);
            else
                exit;
            end if;
        end;
    end loop;
    Dump_Working_Memory;
end Test_Rule_Base;