@woosh/meep-engine/src/engine/intelligence/behavior/util/ConditionalBehavior.js

Pure JavaScript game engine. Fully featured and production ready.

import { assert } from "../../../../core/assert.js";
import { BehaviorStatus } from "../BehaviorStatus.js";
import { AbstractDecoratorBehavior } from "../decorator/AbstractDecoratorBehavior.js";
import { SucceedingBehavior } from "../primitive/SucceedingBehavior.js";

export class ConditionalBehavior extends AbstractDecoratorBehavior {

    /**
     *
     * @type {Behavior}
     */
    condition = SucceedingBehavior.INSTANCE;

    /**
     *
     * @param {Behavior} behavior
     */
    setCondition(behavior) {
        assert.defined(behavior, 'behavior');
        assert.notNull(behavior, 'behavior');
        assert.equal(behavior.isBehavior, true, 'behavior.isBehavior !== true');

        this.condition = behavior;
    }

    tick(timeDelta) {
        const condition = this.condition;
        condition.initialize(this.context);

        const s = condition.tick(timeDelta);


        if (s === BehaviorStatus.Succeeded) {

            condition.finalize();

            const s1 = this.__source.tick(timeDelta);

            return s1;

        } else if (s === BehaviorStatus.Failed) {
            condition.finalize();

            return s;

        } else {
            //waiting?
            return s;
        }

    }

    finalize() {
        super.finalize();

        const condition = this.condition;

        condition.finalize();
    }

    /**
     *
     * @param {Behavior} condition
     * @param {Behavior} source
     * @return {ConditionalBehavior}
     */
    static from(condition, source) {
        const r = new ConditionalBehavior();

        r.setCondition(condition);
        r.setSource(source);

        return r;
    }
}