Add Timeout Action to reducer

Author: cvle

src/reducer.spec.ts

@@ -490,6 +490,45 @@ describe("actions", () => {
       });
     });
   });
+  describe("Timeout", () => {
+    const actionID = ActionID.Timeout;
+    const validOrigin = [
+      StateID.AppearTriggered, StateID.AppearStarted,
+      StateID.EnterTriggered, StateID.EnterStarted,
+      StateID.LeaveTriggered, StateID.LeaveStarted,
+    ];
+
+    it("should fail on invalid state transitions", () => {
+      StateIDList
+        .filter((id) => validOrigin.indexOf(id) < 0)
+        .forEach((id) => assert.throw(() => reducer(id, { kind: actionID, props: {} })));
+    });
+    it("should transit to active state", () => {
+      const origin = [
+        StateID.AppearTriggered, StateID.AppearStarted,
+        StateID.EnterTriggered, StateID.EnterStarted,
+      ];
+      origin.forEach((id) => {
+        const {state, pending} = reducer(id, { kind: actionID, props: {} });
+        assert.isUndefined(pending);
+        assert.strictEqual(state.id, StateID.Active);
+      });
+    });
+    it("should transit to default state", () => {
+      [StateID.LeaveTriggered, StateID.LeaveStarted].forEach((id) => {
+        const {state, pending} = reducer(id, { kind: actionID, props: {} });
+        assert.isUndefined(pending);
+        assert.strictEqual(state.id, StateID.Default);
+      });
+    });
+    it("should complete", () => {
+      validOrigin.forEach((id) => {
+        const result = reducer(id, { kind: actionID, props: {} });
+        assert.isTrue(result.completed);
+      });
+    });
+  });
+
   describe("TransitionTrigger", () => {
     const actionID = ActionID.TransitionTrigger;
     it("should transit to enter init state", () => {

src/reducer.ts

@@ -50,6 +50,7 @@ export enum ActionID {
   TransitionTrigger,
   TransitionStart,
   TransitionComplete,
+  Timeout,
 }
 
 export type ActionPropKeys =
@@ -271,8 +272,8 @@ export const reducer: Reducer = (stateID, action) => {
       }
     case ActionID.TransitionComplete:
       switch (stateID) {
-        case StateID.AppearStarted:
         case StateID.AppearTriggered:
+        case StateID.AppearStarted:
         case StateID.EnterTriggered:
         case StateID.EnterStarted:
           return { state: activeState(props), completed: true };
@@ -319,6 +320,19 @@ export const reducer: Reducer = (stateID, action) => {
         default:
           throw new Error(`invalid state transition from ${StateID[stateID as any]}`);
       }
+    case ActionID.Timeout:
+      switch (stateID) {
+        case StateID.AppearTriggered:
+        case StateID.AppearStarted:
+        case StateID.EnterTriggered:
+        case StateID.EnterStarted:
+          return { state: activeState(props), completed: true };
+        case StateID.LeaveTriggered:
+        case StateID.LeaveStarted:
+          return { state: defaultState(props), completed: true };
+        default:
+          throw new Error(`invalid state transition from ${StateID[stateID]}`);
+      }
     default:
   }
   throw new Error("unexpected error");