angular-cn/packages/core/src/application_tokens.ts

71 lines
2.1 KiB
TypeScript

/**
* @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 {InjectionToken} from './di';
import {ComponentRef} from './linker/component_factory';
/**
* A DI Token representing a unique string id assigned to the application by Angular and used
* primarily for prefixing application attributes and CSS styles when
* {@link ViewEncapsulation#Emulated ViewEncapsulation.Emulated} is being used.
*
* If you need to avoid randomly generated value to be used as an application id, you can provide
* a custom value via a DI provider <!-- TODO: provider --> configuring the root {@link Injector}
* using this token.
* @publicApi
*/
export const APP_ID = new InjectionToken<string>('AppId');
export function _appIdRandomProviderFactory() {
return `${_randomChar()}${_randomChar()}${_randomChar()}`;
}
/**
* Providers that will generate a random APP_ID_TOKEN.
* @publicApi
*/
export const APP_ID_RANDOM_PROVIDER = {
provide: APP_ID,
useFactory: _appIdRandomProviderFactory,
deps: <any[]>[],
};
function _randomChar(): string {
return String.fromCharCode(97 + Math.floor(Math.random() * 25));
}
/**
* A function that will be executed when a platform is initialized.
* @publicApi
*/
export const PLATFORM_INITIALIZER = new InjectionToken<Array<() => void>>('Platform Initializer');
/**
* A token that indicates an opaque platform id.
* @publicApi
*/
export const PLATFORM_ID = new InjectionToken<Object>('Platform ID');
/**
* All callbacks provided via this token will be called for every component that is bootstrapped.
* Signature of the callback:
*
* `(componentRef: ComponentRef) => void`.
*
* @publicApi
*/
export const APP_BOOTSTRAP_LISTENER =
new InjectionToken<Array<(compRef: ComponentRef<any>) => void>>('appBootstrapListener');
/**
* A token which indicates the root directory of the application
* @publicApi
*/
export const PACKAGE_ROOT_URL = new InjectionToken<string>('Application Packages Root URL');