Method indexSystemByComponents

packages/core/src/ECS/Scene.ts:699–731

* 将系统添加到组件索引 * * 根据系统的 Matcher 条件，将系统注册到相应的组件ID索引中。 * * Index a system by its interested component types. * Registers the system to component ID indices based on its Matcher conditions. * * @param system 要索引的系统 | The system to index

(system: EntitySystem)

     * @param system 要索引的系统 | The system to index
     */
    private indexSystemByComponents(system: EntitySystem): void {
        const matcher = system.matcher;
        if (!matcher) {
            return;
        }

        if (matcher.isNothing()) {
            return;
        }

        const condition = matcher.getCondition();

        if (condition.none.length > 0 || condition.tag !== undefined || condition.name !== undefined) {
            this._globalNotifySystems.add(system);
        }

        if (matcher.isEmpty()) {
            this._globalNotifySystems.add(system);
            return;
        }

        for (const componentType of condition.all) {
            this.addSystemToComponentIndex(componentType, system);
        }

        for (const componentType of condition.any) {
            this.addSystemToComponentIndex(componentType, system);
        }

        if (condition.component) {
            this.addSystemToComponentIndex(condition.component, system);
        }
    }

    /**
     * 将系统添加到指定组件的索引