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| import {activationStrategy} from './navigation-plan';
import {isNavigationCommand} from './navigation-commands';
export class CanDeactivatePreviousStep {
run(navigationInstruction: NavigationInstruction, next: Function) {
return processDeactivatable(navigationInstruction.plan, 'canDeactivate', next);
}
}
export class CanActivateNextStep {
run(navigationInstruction: NavigationInstruction, next: Function) {
return processActivatable(navigationInstruction, 'canActivate', next);
}
}
export class DeactivatePreviousStep {
run(navigationInstruction: NavigationInstruction, next: Function) {
return processDeactivatable(navigationInstruction.plan, 'deactivate', next, true);
}
}
export class ActivateNextStep {
run(navigationInstruction: NavigationInstruction, next: Function) {
return processActivatable(navigationInstruction, 'activate', next, true);
}
}
function processDeactivatable(plan, callbackName, next, ignoreResult) {
let infos = findDeactivatable(plan, callbackName);
let i = infos.length; //query from inside out
function inspect(val) {
if (ignoreResult || shouldContinue(val)) {
return iterate();
}
return next.cancel(val);
}
function iterate() {
if (i--) {
try {
let viewModel = infos[i];
let result = viewModel[callbackName]();
return processPotential(result, inspect, next.cancel);
} catch (error) {
return next.cancel(error);
}
}
return next();
}
return iterate();
}
function findDeactivatable(plan, callbackName, list: Array<Object> = []): Array<Object> {
for (let viewPortName in plan) {
let viewPortPlan = plan[viewPortName];
let prevComponent = viewPortPlan.prevComponent;
if ((viewPortPlan.strategy === activationStrategy.invokeLifecycle ||
viewPortPlan.strategy === activationStrategy.replace) &&
prevComponent) {
let viewModel = prevComponent.viewModel;
Eif (callbackName in viewModel) {
list.push(viewModel);
}
}
if (viewPortPlan.childNavigationInstruction) {
findDeactivatable(viewPortPlan.childNavigationInstruction.plan, callbackName, list);
} else Eif (prevComponent) {
addPreviousDeactivatable(prevComponent, callbackName, list);
}
}
return list;
}
function addPreviousDeactivatable(component, callbackName, list): void {
let childRouter = component.childRouter;
if (childRouter && childRouter.currentInstruction) {
let viewPortInstructions = childRouter.currentInstruction.viewPortInstructions;
for (let viewPortName in viewPortInstructions) {
let viewPortInstruction = viewPortInstructions[viewPortName];
let prevComponent = viewPortInstruction.component;
let prevViewModel = prevComponent.viewModel;
Eif (callbackName in prevViewModel) {
list.push(prevViewModel);
}
addPreviousDeactivatable(prevComponent, callbackName, list);
}
}
}
function processActivatable(navigationInstruction: NavigationInstruction, callbackName: any, next: Function, ignoreResult: boolean) {
let infos = findActivatable(navigationInstruction, callbackName);
let length = infos.length;
let i = -1; //query from top down
function inspect(val, router) {
if (ignoreResult || shouldContinue(val, router)) {
return iterate();
}
return next.cancel(val);
}
function iterate() {
i++;
if (i < length) {
try {
let current = infos[i];
let result = current.viewModel[callbackName](...current.lifecycleArgs);
return processPotential(result, val => inspect(val, current.router), next.cancel);
} catch (error) {
return next.cancel(error);
}
}
return next();
}
return iterate();
}
function findActivatable(navigationInstruction: NavigationInstruction, callbackName: string, list: Array<Object> = [], router: Router): Array<Object> {
let plan = navigationInstruction.plan;
Object.keys(plan).filter((viewPortName) => {
let viewPortPlan = plan[viewPortName];
let viewPortInstruction = navigationInstruction.viewPortInstructions[viewPortName];
let viewModel = viewPortInstruction.component.viewModel;
Eif ((viewPortPlan.strategy === activationStrategy.invokeLifecycle || viewPortPlan.strategy === activationStrategy.replace) && callbackName in viewModel) {
list.push({
viewModel,
lifecycleArgs: viewPortInstruction.lifecycleArgs,
router
});
}
Iif (viewPortPlan.childNavigationInstruction) {
findActivatable(
viewPortPlan.childNavigationInstruction,
callbackName,
list,
viewPortInstruction.component.childRouter || router
);
}
});
return list;
}
function shouldContinue(output, router: Router) {
Iif (output instanceof Error) {
return false;
}
Iif (isNavigationCommand(output)) {
if (typeof output.setRouter === 'function') {
output.setRouter(router);
}
return !!output.shouldContinueProcessing;
}
Iif (output === undefined) {
return true;
}
return output;
}
/**
* A basic interface for an Observable type
*/
interface IObservable {
subscribe(): ISubscription;
}
/**
* A basic interface for a Subscription to an Observable
*/
interface ISubscription {
unsubscribe(): void;
}
type SafeSubscriptionFunc = (sub: SafeSubscription) => ISubscription;
/**
* wraps a subscription, allowing unsubscribe calls even if
* the first value comes synchronously
*/
class SafeSubscription {
constructor(subscriptionFunc: SafeSubscriptionFunc) {
this._subscribed = true;
this._subscription = subscriptionFunc(this);
if (!this._subscribed) this.unsubscribe();
}
get subscribed(): boolean {
return this._subscribed;
}
unsubscribe(): void {
if (this._subscribed && this._subscription) this._subscription.unsubscribe();
this._subscribed = false;
}
}
function processPotential(obj, resolve, reject) {
if (obj && typeof obj.then === 'function') {
return Promise.resolve(obj).then(resolve).catch(reject);
}
Iif (obj && typeof obj.subscribe === 'function') {
let obs: IObservable = obj;
return new SafeSubscription(sub => obs.subscribe({
next() {
if (sub.subscribed) {
sub.unsubscribe();
resolve(obj);
}
},
error(error) {
if (sub.subscribed) {
sub.unsubscribe();
reject(error);
}
},
complete() {
if (sub.subscribed) {
sub.unsubscribe();
resolve(obj);
}
}
}));
}
try {
return resolve(obj);
} catch (error) {
return reject(error);
}
}
|