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