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import {Promise, PromiseWrapper, EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
import {Map, MapWrapper, List, ListWrapper} from 'angular2/src/facade/collection';
import {
isBlank,
isString,
StringWrapper,
isPresent,
Type,
isArray,
BaseException
} from 'angular2/src/facade/lang';
import {RouteRegistry} from './route_registry';
import {Pipeline} from './pipeline';
import {Instruction} from './instruction';
import {RouterOutlet} from './router_outlet';
import {Location} from './location';
import {getCanActivateHook} from './route_lifecycle_reflector';
import {RouteDefinition} from './route_config_impl';
let _resolveToTrue = PromiseWrapper.resolve(true);
let _resolveToFalse = PromiseWrapper.resolve(false);
/**
* # Router
* The router is responsible for mapping URLs to components.
*
* You can see the state of the router by inspecting the read-only field `router.navigating`.
* This may be useful for showing a spinner, for instance.
*
* ## Concepts
* Routers and component instances have a 1:1 correspondence.
*
* The router holds reference to a number of "outlets." An outlet is a placeholder that the
* router dynamically fills in depending on the current URL.
*
* When the router navigates from a URL, it must first recognizes it and serialize it into an
* `Instruction`.
* The router uses the `RouteRegistry` to get an `Instruction`.
*/
export class Router {
navigating: boolean = false;
lastNavigationAttempt: string;
private _currentInstruction: Instruction = null;
private _currentNavigation: Promise<any> = _resolveToTrue;
private _outlet: RouterOutlet = null;
private _subject: EventEmitter = new EventEmitter();
// todo(jeffbcross): rename _registry to registry since it is accessed from subclasses
// todo(jeffbcross): rename _pipeline to pipeline since it is accessed from subclasses
constructor(public registry: RouteRegistry, public _pipeline: Pipeline, public parent: Router,
public hostComponent: any) {}
/**
* Constructs a child router. You probably don't need to use this unless you're writing a reusable
* component.
*/
childRouter(hostComponent: any): Router { return new ChildRouter(this, hostComponent); }
/**
* Register an object to notify of route changes. You probably don't need to use this unless
* you're writing a reusable component.
*/
registerOutlet(outlet: RouterOutlet): Promise<boolean> {
// TODO: sibling routes
this._outlet = outlet;
if (isPresent(this._currentInstruction)) {
return outlet.commit(this._currentInstruction);
}
return _resolveToTrue;
}
/**
* Dynamically update the routing configuration and trigger a navigation.
*
* # Usage
*
* ```
* router.config([
* { 'path': '/', 'component': IndexComp },
* { 'path': '/user/:id', 'component': UserComp },
* ]);
* ```
*/
config(definitions: List<RouteDefinition>): Promise<any> {
definitions.forEach((routeDefinition) => {
this.registry.config(this.hostComponent, routeDefinition, this instanceof RootRouter);
});
return this.renavigate();
}
/**
* Navigate to a URL. Returns a promise that resolves when navigation is complete.
*
* If the given URL begins with a `/`, router will navigate absolutely.
* If the given URL does not begin with `/`, the router will navigate relative to this component.
*/
navigate(url: string): Promise<any> {
return this._currentNavigation = this._currentNavigation.then((_) => {
this.lastNavigationAttempt = url;
this._startNavigating();
return this._afterPromiseFinishNavigating(this.recognize(url).then((matchedInstruction) => {
if (isBlank(matchedInstruction)) {
return false;
}
return this._reuse(matchedInstruction)
.then((_) => this._canActivate(matchedInstruction))
.then((result) => {
if (!result) {
return false;
}
return this._canDeactivate(matchedInstruction)
.then((result) => {
if (result) {
return this.commit(matchedInstruction)
.then((_) => {
this._emitNavigationFinish(matchedInstruction.accumulatedUrl);
return true;
});
}
});
});
}));
});
}
private _emitNavigationFinish(url): void { ObservableWrapper.callNext(this._subject, url); }
private _afterPromiseFinishNavigating(promise: Promise<any>): Promise<any> {
return PromiseWrapper.catchError(promise.then((_) => this._finishNavigating()), (err) => {
this._finishNavigating();
throw err;
});
}
_reuse(instruction): Promise<any> {
if (isBlank(this._outlet)) {
return _resolveToFalse;
}
return this._outlet.canReuse(instruction)
.then((result) => {
instruction.reuse = result;
if (isPresent(this._outlet.childRouter) && isPresent(instruction.child)) {
return this._outlet.childRouter._reuse(instruction.child);
}
});
}
private _canActivate(instruction: Instruction): Promise<boolean> {
return canActivateOne(instruction, this._currentInstruction);
}
private _canDeactivate(instruction: Instruction): Promise<boolean> {
if (isBlank(this._outlet)) {
return _resolveToTrue;
}
var next: Promise<boolean>;
if (isPresent(instruction) && instruction.reuse) {
next = _resolveToTrue;
} else {
next = this._outlet.canDeactivate(instruction);
}
return next.then((result) => {
if (result == false) {
return false;
}
if (isPresent(this._outlet.childRouter)) {
return this._outlet.childRouter._canDeactivate(isPresent(instruction) ? instruction.child :
null);
}
return true;
});
}
/**
* Updates this router and all descendant routers according to the given instruction
*/
commit(instruction: Instruction): Promise<any> {
this._currentInstruction = instruction;
if (isPresent(this._outlet)) {
return this._outlet.commit(instruction);
}
return _resolveToTrue;
}
_startNavigating(): void { this.navigating = true; }
_finishNavigating(): void { this.navigating = false; }
/**
* Subscribe to URL updates from the router
*/
subscribe(onNext: (value: any) => void): void {
ObservableWrapper.subscribe(this._subject, onNext);
}
/**
* Removes the contents of this router's outlet and all descendant outlets
*/
deactivate(instruction: Instruction): Promise<any> {
if (isPresent(this._outlet)) {
return this._outlet.deactivate(instruction);
}
return _resolveToTrue;
}
/**
* Given a URL, returns an instruction representing the component graph
*/
recognize(url: string): Promise<Instruction> {
return this.registry.recognize(url, this.hostComponent);
}
/**
* Navigates to either the last URL successfully navigated to, or the last URL requested if the
* router has yet to successfully navigate.
*/
renavigate(): Promise<any> {
if (isBlank(this.lastNavigationAttempt)) {
return this._currentNavigation;
}
return this.navigate(this.lastNavigationAttempt);
}
/**
* Generate a URL from a component name and optional map of parameters. The URL is relative to the
* app's base href.
*/
generate(linkParams: List<any>): string {
let normalizedLinkParams = splitAndFlattenLinkParams(linkParams);
var first = ListWrapper.first(normalizedLinkParams);
var rest = ListWrapper.slice(normalizedLinkParams, 1);
var router = this;
// The first segment should be either '.' (generate from parent) or '' (generate from root).
// When we normalize above, we strip all the slashes, './' becomes '.' and '/' becomes ''.
if (first == '') {
while (isPresent(router.parent)) {
router = router.parent;
}
} else if (first == '..') {
router = router.parent;
while (ListWrapper.first(rest) == '..') {
rest = ListWrapper.slice(rest, 1);
router = router.parent;
if (isBlank(router)) {
throw new BaseException(
`Link "${ListWrapper.toJSON(linkParams)}" has too many "../" segments.`);
}
}
} else if (first != '.') {
throw new BaseException(
`Link "${ListWrapper.toJSON(linkParams)}" must start with "/", "./", or "../"`);
}
if (rest[rest.length - 1] == '') {
ListWrapper.removeLast(rest);
}
if (rest.length < 1) {
let msg = `Link "${ListWrapper.toJSON(linkParams)}" must include a route name.`;
throw new BaseException(msg);
}
let url = '';
if (isPresent(router.parent) && isPresent(router.parent._currentInstruction)) {
url = router.parent._currentInstruction.capturedUrl;
}
return url + '/' + this.registry.generate(rest, router.hostComponent);
}
}
export class RootRouter extends Router {
_location: Location;
constructor(registry: RouteRegistry, pipeline: Pipeline, location: Location,
hostComponent: Type) {
super(registry, pipeline, null, hostComponent);
this._location = location;
this._location.subscribe((change) => this.navigate(change['url']));
this.registry.configFromComponent(hostComponent, true);
this.navigate(location.path());
}
commit(instruction: Instruction): Promise<any> {
return super.commit(instruction)
.then((_) => { this._location.go(instruction.accumulatedUrl); });
}
}
class ChildRouter extends Router {
constructor(parent: Router, hostComponent) {
super(parent.registry, parent._pipeline, parent, hostComponent);
this.parent = parent;
}
navigate(url: string): Promise<any> {
// Delegate navigation to the root router
return this.parent.navigate(url);
}
}
/*
* Given: ['/a/b', {c: 2}]
* Returns: ['', 'a', 'b', {c: 2}]
*/
var SLASH = new RegExp('/');
function splitAndFlattenLinkParams(linkParams: List<any>): List<any> {
return ListWrapper.reduce(linkParams, (accumulation, item) => {
if (isString(item)) {
return ListWrapper.concat(accumulation, StringWrapper.split(item, SLASH));
}
accumulation.push(item);
return accumulation;
}, []);
}
function canActivateOne(nextInstruction, currentInstruction): Promise<boolean> {
var next = _resolveToTrue;
if (isPresent(nextInstruction.child)) {
next = canActivateOne(nextInstruction.child,
isPresent(currentInstruction) ? currentInstruction.child : null);
}
return next.then((res) => {
if (res == false) {
return false;
}
if (nextInstruction.reuse) {
return true;
}
var hook = getCanActivateHook(nextInstruction.component);
if (isPresent(hook)) {
return hook(nextInstruction, currentInstruction);
}
return true;
});
}