totobal5/fastsm

FastSM

FastSM aims to be a more lightweight alternative to the fantastic SnowState library by Sahaun. FastSM employs different design paradigms which make it more flexible in certain cases, while making it more restrictive in others. Hard limits FastSM has are :

• There can never be more than 64 State Tags per FSM
• There can never be more than 64 States per FSM if you are using the allow/forbid feature of state transitions.

I will be documenting FastSM properly soon but for now you can find example code here :

enum Tag {
    A,
    B,
    C
}
enum State {
    None, //required, any name allowed
    Foo,
    Bar,
    Baz,
    MAX //QoL
}
enum Trigger {
    A,
    MAX
}
fsm = new FastSM(State.MAX, Trigger.MAX);
fsm.event_add_default("update");

fsm.add( State.Baz, {
    name : "I should never show up in this example!",
    enter : function(this) {
       show_debug_message(this.name)
    }
});

fsm.add( State.Bar, {
    name : "I should show up in this example!",
    tags : Tag.C,
    enter : function(this) {
       show_debug_message(this.name)
    }, 
    update : function() {
         show_debug_message("update should be called!")
    }
});

fsm.add( State.Foo, {
    name : "I am the entry state!",
    tags : [Tag.A, Tag.B],
    enter : function(this) {
        show_debug_message(this.name)
    }
});

fsm.transition_add( Trigger.A, {
    name : "Trigger A",
    include: all,
    forbid: State.Bar,
    transition : function(_source) {
        switch _source {
            case State.Foo:
                return State.Bar;
            break;
            case State.Bar:
                return State.Baz;
            break;
            default:
                return State.None;
        }
    }
});

fsm.build().start( State.Foo );
fsm.trigger( Trigger.A );
fsm.trigger( Trigger.A );
fsm.trigger( Trigger.A );
fsm.update();