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/**
* Copyright (c) 2019 The xterm.js authors. All rights reserved.
* @license MIT
*
* This was heavily inspired from microsoft/vscode's dependency injection system (MIT).
*/
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { IServiceIdentifier } from 'common/services/Services';
const DI_TARGET = 'di$target';
const DI_DEPENDENCIES = 'di$dependencies';
export const serviceRegistry: Map<string, IServiceIdentifier<any>> = new Map();
export function getServiceDependencies(ctor: any): { id: IServiceIdentifier<any>, index: number, optional: boolean }[] {
return ctor[DI_DEPENDENCIES] || [];
}
export function createDecorator<T>(id: string): IServiceIdentifier<T> {
if (serviceRegistry.has(id)) {
return serviceRegistry.get(id)!;
}
const decorator: any = function (target: Function, key: string, index: number): any {
if (arguments.length !== 3) {
throw new Error('@IServiceName-decorator can only be used to decorate a parameter');
}
storeServiceDependency(decorator, target, index);
};
decorator.toString = () => id;
serviceRegistry.set(id, decorator);
return decorator;
}
function storeServiceDependency(id: Function, target: Function, index: number): void {
if ((target as any)[DI_TARGET] === target) {
(target as any)[DI_DEPENDENCIES].push({ id, index });
} else {
(target as any)[DI_DEPENDENCIES] = [{ id, index }];
(target as any)[DI_TARGET] = target;
}
}
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