@dcl/ecs/dist-cjs/engine/systems.js

Decentraland ECS

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SystemContainer = exports.SYSTEMS_REGULAR_PRIORITY = void 0;
exports.SYSTEMS_REGULAR_PRIORITY = 100e3;
function SystemContainer() {
    const systems = [];
    function sort() {
        // TODO: systems with the same priority should always have the same stable order
        //       add a "counter" to the System type to ensure that order
        systems.sort((a, b) => b.priority - a.priority);
    }
    function add(fn, priority, name) {
        const systemName = name ?? fn.name;
        if (systems.find((item) => item.fn === fn)) {
            throw new Error(`System ${JSON.stringify(systemName)} already added to the engine`);
        }
        systems.push({
            fn,
            priority,
            name: systemName
        });
        // TODO: replace this sort by an insertion in the right place
        sort();
    }
    function remove(selector) {
        let index = -1;
        if (typeof selector === 'string') {
            index = systems.findIndex((item) => item.name === selector);
        }
        else {
            index = systems.findIndex((item) => item.fn === selector);
        }
        if (index === -1) {
            return false;
        }
        systems.splice(index, 1);
        sort();
        return true;
    }
    return {
        add,
        remove,
        getSystems() {
            return systems;
        }
    };
}
exports.SystemContainer = SystemContainer;