darker-engine/esm/src/uid.js

ecs lightweight library

export const uid = (getEntityList) => {
    const lastSafeIdMap = {
        [UIDKey.ENTITY]: 0,
        [UIDKey.SYSTEM]: 0, //<< meh
    };
    const lastIdMap = {
        [UIDKey.ENTITY]: 0,
        [UIDKey.SYSTEM]: 0,
    };
    const idCheckMapFunc = {
        [UIDKey.ENTITY]: (currentId) => currentId !== undefined && getEntityList()[currentId] !== undefined,
        [UIDKey.SYSTEM]: () => false,
    };
    const getUID = (key, safe = false) => {
        const increment = safe ? 10000 : 0;
        const _getUID = () => (safe ? lastSafeIdMap[key] : lastIdMap[key]) + increment;
        do {
            if (safe)
                lastSafeIdMap[key]++;
            else
                lastIdMap[key]++;
        } while (idCheckMapFunc[key](_getUID()));
        return _getUID();
    };
    return {
        getUID,
    };
};
export var UIDKey;
(function (UIDKey) {
    UIDKey[UIDKey["ENTITY"] = 0] = "ENTITY";
    UIDKey[UIDKey["SYSTEM"] = 1] = "SYSTEM";
})(UIDKey || (UIDKey = {}));