Added SET_ACTIONS_ACTIVE, ability to set multiple actions between start and end indices to be active or skipped

Author: khankuan

src/instrument.js

@@ -1,4 +1,5 @@
 import difference from 'lodash/difference';
+import union from 'lodash/union';
 
 export const ActionTypes = {
   PERFORM_ACTION: 'PERFORM_ACTION',
@@ -7,6 +8,7 @@ export const ActionTypes = {
   COMMIT: 'COMMIT',
   SWEEP: 'SWEEP',
   TOGGLE_ACTION: 'TOGGLE_ACTION',
+  SET_ACTIONS_ACTIVE: 'SET_ACTIONS_ACTIVE',
   JUMP_TO_STATE: 'JUMP_TO_STATE',
   IMPORT_STATE: 'IMPORT_STATE'
 };
@@ -45,6 +47,10 @@ export const ActionCreators = {
     return { type: ActionTypes.TOGGLE_ACTION, id };
   },
 
+  setActionsActive(start, end, active=true) {
+    return { type: ActionTypes.SET_ACTIONS_ACTIVE, start, end, active };
+  },
+
   jumpToState(index) {
     return { type: ActionTypes.JUMP_TO_STATE, index };
   },
@@ -219,6 +225,22 @@ function liftReducerWith(reducer, initialCommittedState, monitorReducer) {
         minInvalidatedStateIndex = stagedActionIds.indexOf(actionId);
         break;
       }
+      case ActionTypes.SET_ACTIONS_ACTIVE: {
+        // Toggle whether an action with given ID is skipped.
+        // Being skipped means it is a no-op during the computation.
+        const { start, end, active } = liftedAction;
+        const actionIds = [];
+        for (let i = start; i < end; i++) actionIds.push(i);
+        if (active) {
+          skippedActionIds = difference(skippedActionIds, actionIds);
+        } else {
+          skippedActionIds = union(skippedActionIds, actionIds);
+        }
+
+        // Optimization: we know history before this action hasn't changed
+        minInvalidatedStateIndex = stagedActionIds.indexOf(start);
+        break;
+      }
       case ActionTypes.JUMP_TO_STATE: {
         // Without recomputing anything, move the pointer that tell us
         // which state is considered the current one. Useful for sliders.

test/instrument.spec.js

@@ -100,6 +100,23 @@ describe('instrument', () => {
     expect(store.getState()).toBe(1);
   });
 
+  it('should set multiple action skip', () => {
+    // actionId 0 = @@INIT
+    store.dispatch({ type: 'INCREMENT' });
+    store.dispatch({ type: 'INCREMENT' });
+    store.dispatch({ type: 'INCREMENT' });
+    expect(store.getState()).toBe(3);
+
+    liftedStore.dispatch(ActionCreators.setActionsActive(1, 3, false));
+    expect(store.getState()).toBe(1);
+
+    liftedStore.dispatch(ActionCreators.setActionsActive(0, 2, true));
+    expect(store.getState()).toBe(2);
+
+    liftedStore.dispatch(ActionCreators.setActionsActive(0, 1, true));
+    expect(store.getState()).toBe(2);
+  });
+
   it('should sweep disabled actions', () => {
     // actionId 0 = @@INIT
     store.dispatch({ type: 'INCREMENT' });