@dcl/ecs/dist/systems/cyclicParentingChecker.js

Decentraland ECS

import * as components from '../components';
/**
 * Transform parenting: cyclic dependency checker
 * It checks only in modified Transforms
 *
 * Add this system with:
 * ```ts
 *  engine.addSystem(cyclicParentingChecker(engine))
 * ````
 * And then it will check every tick the parenting.
 *
 * @public
 *
 * @params engine
 * @returns a system
 */
export function cyclicParentingChecker(engine) {
    const Transform = components.Transform(engine);
    return () => {
        for (const entity of Transform.dirtyIterator()) {
            let transform = Transform.getOrNull(entity);
            while (transform && transform.parent) {
                if (transform.parent === entity) {
                    console.error(`There is a cyclic parent with entity ${entity}`);
                    break;
                }
                else {
                    transform = Transform.getOrNull(transform.parent);
                }
            }
        }
    };
}