refactor: move angular source to /packages rather than modules/@angular

packages/router/src/router_config_loader.ts

@@ -0,0 +1,70 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Compiler, ComponentFactoryResolver, InjectionToken, Injector, NgModuleFactory, NgModuleFactoryLoader} from '@angular/core';
+import {Observable} from 'rxjs/Observable';
+import {fromPromise} from 'rxjs/observable/fromPromise';
+import {of } from 'rxjs/observable/of';
+import {map} from 'rxjs/operator/map';
+import {mergeMap} from 'rxjs/operator/mergeMap';
+import {LoadChildren, Route} from './config';
+import {flatten, wrapIntoObservable} from './utils/collection';
+
+/**
+ * @docsNotRequired
+ * @experimental
+ */
+export const ROUTES = new InjectionToken<Route[][]>('ROUTES');
+
+export class LoadedRouterConfig {
+  constructor(
+      public routes: Route[], public injector: Injector,
+      public factoryResolver: ComponentFactoryResolver, public injectorFactory: Function) {}
+}
+
+export class RouterConfigLoader {
+  constructor(
+      private loader: NgModuleFactoryLoader, private compiler: Compiler,
+      private onLoadStartListener?: (r: Route) => void,
+      private onLoadEndListener?: (r: Route) => void) {}
+
+  load(parentInjector: Injector, route: Route): Observable<LoadedRouterConfig> {
+    if (this.onLoadStartListener) {
+      this.onLoadStartListener(route);
+    }
+
+    const moduleFactory$ = this.loadModuleFactory(route.loadChildren);
+
+    return map.call(moduleFactory$, (factory: NgModuleFactory<any>) => {
+      if (this.onLoadEndListener) {
+        this.onLoadEndListener(route);
+      }
+
+      const module = factory.create(parentInjector);
+      const injectorFactory = (parent: Injector) => factory.create(parent).injector;
+
+      return new LoadedRouterConfig(
+          flatten(module.injector.get(ROUTES)), module.injector, module.componentFactoryResolver,
+          injectorFactory);
+    });
+  }
+
+  private loadModuleFactory(loadChildren: LoadChildren): Observable<NgModuleFactory<any>> {
+    if (typeof loadChildren === 'string') {
+      return fromPromise(this.loader.load(loadChildren));
+    } else {
+      return mergeMap.call(wrapIntoObservable(loadChildren()), (t: any) => {
+        if (t instanceof NgModuleFactory) {
+          return of (t);
+        } else {
+          return fromPromise(this.compiler.compileModuleAsync(t));
+        }
+      });
+    }
+  }
+}