74 lines
1.5 KiB
Haxe
74 lines
1.5 KiB
Haxe
package armory.system;
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class FSM<T> {
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final transitions = new Array<Transition<T>>();
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final tempTransitions = new Array<Transition<T>>();
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var state: Null<State<T>>;
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var entered = false;
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public function new() {}
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public function bindTransition(canEnter: Void -> Bool, fromState: State<T>, toState: State<T>) {
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final transition = new Transition<T>(canEnter, fromState, toState);
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transitions.push(transition);
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syncTransitions();
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}
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public function setInitState(state: State<T>) {
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this.state = state;
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syncTransitions();
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}
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public function update() {
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if (!entered) {
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state.onEnter();
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entered = true;
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}
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state.onUpdate();
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for (transition in tempTransitions) {
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if (transition.canEnter()) {
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state.onExit();
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state = transition.toState;
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entered = false;
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syncTransitions();
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break;
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}
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}
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}
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public function syncTransitions() {
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tempTransitions.resize(0);
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for (transition in transitions) {
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if (transition.fromState == state) tempTransitions.push(transition);
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}
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}
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}
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class Transition<T> {
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public final canEnter: Void -> Bool;
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public final fromState: State<T>;
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public final toState: State<T>;
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public function new(canEnter: Void -> Bool, fromState: State<T>, toState: State<T>) {
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this.canEnter = canEnter;
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this.fromState = fromState;
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this.toState = toState;
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}
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}
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class State<T> {
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final owner: T;
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public function new(owner: T) {
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this.owner = owner;
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}
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public function onEnter() {}
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public function onUpdate() {}
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public function onExit() {}
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} |