Replace addSystem() and removeSystem().

README.md

@@ -32,7 +32,7 @@ class EchoesExample {
 		Echoes.init();
 
 		//Create and activate an instance of our system.
-		Echoes.addSystem(new RenderSystem()); //Details below.
+		new RenderSystem().activate(); //Details below.
 
 		//Create an entity with the components our system will use. Entities are
 		//activated automatically unless `false` is passed.
@@ -114,8 +114,8 @@ class EchoesExample {
 
 		//Adding `physicsSystems` first means that entire group will run before
 		//`RenderSystem`, even if more systems are added later.
-		Echoes.addSystem(physicsSystems);
-		Echoes.addSystem(new RenderSystem()); //Details in previous example.
+		physicsSystems.activate();
+		new RenderSystem().activate(); //Details in previous example.
 
 		//Create entities: one tree and two rabbits. The rabbits will race
 		//towards the tree.
@@ -303,9 +303,9 @@ class Main {
 
 		//Run all `enterFrame` systems first, then all `midFrame` systems, then
 		//all `exitFrame` systems.
-		Echoes.addSystem(enterFrame);
-		Echoes.addSystem(midFrame);
-		Echoes.addSystem(exitFrame);
+		enterFrame.activate();
+		midFrame.activate();
+		exitFrame.activate();
 
 		//Even if `exitFrame` systems are defined first, they'll run last.
 		exitFrame.add(new ExitFrameSystem());
@@ -333,11 +333,11 @@ class Main {
 		var enterFrame:SystemList = new SystemList();
 		enterFrame.add(new EnterFrameSystem());
 		enterFrame.add(new EnterFrameSystem2());
-		Echoes.addSystem(enterFrame);
+		enterFrame.activate();
 
 		var midFrame:SystemList = new SystemList();
 		midFrame.add(new MidFrameSystem());
-		Echoes.addSystem(midFrame);
+		midFrame.activate();
 
 		//Set up `physics` as part of `midFrame`.
 		var physics:SystemList = new SystemList();
@@ -355,7 +355,7 @@ class Main {
 		var exitFrame:SystemList = new SystemList();
 		exitFrame.add(new ExitFrameSystem());
 		exitFrame.add(new ExitFrameSystem2());
-		Echoes.addSystem(exitFrame);
+		exitFrame.activate();
 	}
 }
 ```
@@ -430,8 +430,8 @@ class Main {
 
 		//Because `AverageSystem` and `list` both have priority 0, they run in
 		//the order they're added.
-		Echoes.addSystem(new AverageSystem());
-		Echoes.addSystem(list);
+		new AverageSystem().activate();
+		list.activate();
 
 		//No matter how high a system's priority, if it's added to `list` it
 		//will run during `list`, and will come after `AverageSystem`.
@@ -576,11 +576,13 @@ Echoes offers a few ways to customize compilation.
 
 ### Since v1.0.0-rc.5
 
+- `Echoes.addSystem()`, `Echoes.hasSystem()`, and `Echoes.removeSystem()` have been replaced by `system.activate()`, `system.active`, and `system.deactivate()`, respectively.
 - `Entity.getComponents()` now returns a list of `ComponentStorage` instances, instead of a map. If you prefer the old format, you can perform an implicit cast: `var map:Map<String, Dynamic> = Entity.getComponents()`.
 - Systems no longer receive `@:remove` events when deactivated. For instance, a system removed by `Echoes.removeSystem()` won't receive a bunch of events.
 - `View.entities` is now an `Array` rather than a `List`. You can still iterate over it as before, but you'll have to call `contains()` rather than `has()` if you want to check existence.
 - `Echoes.activeEntities` and `View.entities` may be re-ordered when entities or their components are removed. You can set `-D echoes_stable_order` to preserve the order, potentially at the cost of speed.
 - `@:remove` listeners are no longer allowed to add back the component that's currently being removed. They may still add other components as normal.
+- `SystemList.exists()` now searches recursively, returning true for grandchildren as well as direct children.
 
 ### Since v1.0.0-rc.3
 
@@ -630,6 +632,8 @@ Find | Replace with | Notes
 `Echoes.entities` | `Echoes.activeEntities`
 `Echoes.views` | `Echoes.activeViews`
 `Echoes.systems` | `Echoes.activeSystems`
+`Echoes.addSystem(system)` | `system.activate()` | You might have used a different variable name than `system`.
+`Echoes.removeSystem(system)` | `system.deactivate()` | Ditto.
 `AbstractView` | `ViewBase` | Import `echoes.View`.
 `ISystem` | `System` | Change "`implements`" to "`extends`," if applicable.
 `ICleanableComponentContainer` | `ComponentStorage`

src/echoes/Echoes.hx

@@ -46,15 +46,38 @@ class Echoes {
 
 	@:allow(echoes.ViewBase)
 	private static final _activeViews:Array<ViewBase> = [];
+	/**
+	 * All currently-active views.
+	 */
 	public static var activeViews(get, never):ReadOnlyArray<ViewBase>;
 	private static inline function get_activeViews():ReadOnlyArray<ViewBase> return _activeViews;
 
+	/**
+	 * All currently-active systems. Unlike `activeEntities` and `activeViews`,
+	 * this is not a flat array, but rather the root node of a tree: it may
+	 * contain `SystemList`s containing `SystemList`s. All active systems will
+	 * be somewhere in this tree.
+	 * 
+	 * Adding a system to this list (whether directly, via `addSystem()`, or by
+	 * adding a list containing that system) activates that system.
+	 * 
+	 * Removing a system from this list (whether directly, via `removeSystem()`,
+	 * or by removing a list containing that system) deactivates that system.
+	 * 
+	 * To search the full tree, use `activeSystems.find()`.
+	 */
 	public static var activeSystems(default, null):SystemList = {
 		var activeSystems:SystemList = new SystemList();
 		activeSystems.__activate__();
 		activeSystems.clock.maxTime = 1;
 		activeSystems;
 	};
+
+	/**
+	 * The clock used to update `activeSystems`. This starts with all the usual
+	 * defaults, except `maxTime` is set to 1 second. Any changes you make to
+	 * this clock will be preserved, even after `Echoes.reset()`.
+	 */
 	public static var clock(get, never):Clock;
 	private static inline function get_clock():Clock {
 		return activeSystems.clock;
@@ -141,21 +164,6 @@ class Echoes {
 		init(0);
 	}
 
-	//System management
-	//=================
-
-	public static inline function addSystem(system:System):Void {
-		activeSystems.add(system);
-	}
-
-	public static inline function removeSystem(system:System):Void {
-		activeSystems.remove(system);
-	}
-
-	public static inline function hasSystem(system:System):Bool {
-		return activeSystems.exists(system);
-	}
-
 	//Singleton getters
 	//=================
 

src/echoes/System.hx

@@ -160,6 +160,22 @@ class System {
 		//Everything else is handled by macro.
 	}
 
+	/**
+	 * Adds this to `activeSystems`, activating it.
+	 * 
+	 * Note: you can also activate this by adding it to an active `SystemList`.
+	 */
+	public inline function activate():Void {
+		Echoes.activeSystems.add(this);
+	}
+
+	/**
+	 * Removes this from `activeSystems`, deactivating it.
+	 */
+	public inline function deactivate():Void {
+		parent.remove(this);
+	}
+
 	/**
 	 * @see `SystemList.find()`
 	 */

src/echoes/SystemList.hx

@@ -131,11 +131,15 @@ class SystemList extends System {
 	}
 
 	/**
-	 * Returns whether this list directly contains the given system.
-	 * @see `find()` if you need to recursively search child lists.
+	 * Returns whether this list directly or indirectly contains `system`. Use
+	 * `system.parent` instead if you only want its direct parent.
 	 */
 	public inline function exists(system:System):Bool {
-		return system.parent == this;
+		var parent:SystemList = system.parent;
+		while(parent != null && parent != this) {
+			parent = parent.parent;
+		}
+		return parent == this;
 	}
 
 	/**

test/AdvancedFunctionalityTest.hx

@@ -51,8 +51,8 @@ class AdvancedFunctionalityTest extends Test {
 	}
 
 	private function testEntityTemplates():Void {
-		Echoes.addSystem(new NameSystem());
-		Echoes.addSystem(new AppearanceSystem());
+		new NameSystem().activate();
+		new AppearanceSystem().activate();
 
 		var entity:Entity = new Entity();
 		entity.add(("John":Name));
@@ -112,7 +112,7 @@ class AdvancedFunctionalityTest extends Test {
 
 	private function testGenerics():Void {
 		var system:GenericSystem<String, Int> = new GenericSystem<String, Int>();
-		Echoes.addSystem(system);
+		system.activate();
 
 		var entity:Entity = new Entity();
 		entity.add("STRING");
@@ -133,7 +133,7 @@ class AdvancedFunctionalityTest extends Test {
 		}
 
 		var system = new GenericSystem<Alias<Name>, String>();
-		Echoes.addSystem(system);
+		system.activate();
 
 		entity.add(("NAME":Alias<Name>));
 		switch(system.record) {
@@ -311,13 +311,13 @@ class AdvancedFunctionalityTest extends Test {
 		Assert.equals(0, viewOfColor.entities.length);
 
 		//Adding/removing the system should activate/deactivate the linked view.
-		Echoes.addSystem(nameSystem);
+		nameSystem.activate();
 		Assert.isTrue(viewOfColor.active);
 		Assert.equals(2, viewOfColor.entities.length);
 		Assert.isTrue(viewOfColor.entities.contains(colorName));
 		Assert.isTrue(viewOfColor.entities.contains(colorShape));
 
-		Echoes.removeSystem(nameSystem);
+		nameSystem.deactivate();
 		Assert.isFalse(viewOfColor.active);
 		Assert.equals(0, viewOfColor.entities.length);
 	}

test/BasicFunctionalityTest.hx

@@ -137,7 +137,7 @@ class BasicFunctionalityTest extends Test {
 		Assert.isFalse(inactive.active);
 		Assert.equals(0, Echoes.activeEntities.length);
 
-		Echoes.addSystem(new AppearanceSystem());
+		new AppearanceSystem().activate();
 		assertTimesCalled(0, "AppearanceSystem.colorAdded");
 
 		//Add some components the system looks for.
@@ -159,7 +159,7 @@ class BasicFunctionalityTest extends Test {
 		var appearanceSystem:AppearanceSystem = new AppearanceSystem();
 		Assert.equals(0, Echoes.activeSystems.length);
 
-		Echoes.addSystem(appearanceSystem);
+		appearanceSystem.activate();
 		Assert.equals(1, Echoes.activeSystems.length);
 		assertTimesCalled(0, "AppearanceSystem.colorAdded");
 
@@ -193,7 +193,7 @@ class BasicFunctionalityTest extends Test {
 		redLine.add(("redLine":Name));
 		assertTimesCalled(0, "NameSystem.nameAdded", "NameSystem isn't active but its method was still called.");
 
-		Echoes.addSystem(nameSystem);
+		nameSystem.activate();
 		assertTimesCalled(2, "NameSystem.nameAdded");
 		assertTimesCalled(0, "NameSystem.nameRemoved");
 
@@ -223,7 +223,7 @@ class BasicFunctionalityTest extends Test {
 		assertTimesCalled(2, "NameSystem.nameRemoved");
 
 		//Deactivate a system.
-		Echoes.removeSystem(nameSystem);
+		nameSystem.deactivate();
 		assertTimesCalled(2, "NameSystem.nameRemoved");
 
 		//Destroy the remaining entity.
@@ -238,7 +238,7 @@ class BasicFunctionalityTest extends Test {
 	private function testUpdateEvents():Void {
 		//Create a `TimeCountSystem` and use a custom `Clock`.
 		var systems:SystemList = new SystemList(new OneSecondClock());
-		Echoes.addSystem(systems);
+		systems.activate();
 
 		var timeCountSystem:TimeCountSystem = new TimeCountSystem();
 		Assert.equals(0.0, timeCountSystem.totalTime);

test/EdgeCaseTest.hx

@@ -23,14 +23,14 @@ class EdgeCaseTest extends Test {
 	//Tests may be run in any order, but not in parallel.
 
 	private function testChildSystems():Void {
-		Echoes.addSystem(new NameSubsystem());
+		new NameSubsystem().activate();
 
 		var entity:Entity = new Entity();
 		entity.add(("Name":Name));
 		assertTimesCalled(0, "NameSystem.nameAdded");
 		assertTimesCalled(1, "NameSubsystem.nameAdded");
 
-		Echoes.addSystem(new NameSystem());
+		new NameSystem().activate();
 		assertTimesCalled(1, "NameSystem.nameAdded");
 		assertTimesCalled(0, "NameSystem.nameRemoved");
 		assertTimesCalled(0, "NameSubsystem.nameRemoved");
@@ -45,7 +45,7 @@ class EdgeCaseTest extends Test {
 	}
 
 	private function testComponentsExist():Void {
-		Echoes.addSystem(new ComponentsExistSystem());
+		new ComponentsExistSystem().activate();
 
 		var entity:Entity = new Entity();
 		entity.add(("name":Name));
@@ -136,7 +136,7 @@ class EdgeCaseTest extends Test {
 	}
 
 	private function testRedundantOperations():Void {
-		Echoes.addSystem(new AppearanceSystem());
+		new AppearanceSystem().activate();
 
 		var entity:Entity = new Entity(false);
 
@@ -171,7 +171,7 @@ class EdgeCaseTest extends Test {
 		assertTimesCalled(1, "AppearanceSystem.colorRemoved");
 
 		//Replace a `Name` with itself.
-		Echoes.addSystem(new NameSystem());
+		new NameSystem().activate();
 		entity.add(("name":Name));
 		assertTimesCalled(1, "NameSystem.nameAdded");
 		assertTimesCalled(0, "NameSystem.nameRemoved");
@@ -189,7 +189,7 @@ class EdgeCaseTest extends Test {
 		var entity:Entity = new Entity();
 
 		//Activate the system first so that it can process events first.
-		Echoes.addSystem(new RecursiveEventSystem());
+		new RecursiveEventSystem().activate();
 
 		//Certain events should stop propagating after `RecursiveEventSystem`
 		//gets to them.