xterm

[VSoRC/.git] / node_modules / xterm / src / common / services / ServiceRegistry.ts

diff --git a/node_modules/xterm/src/common/services/ServiceRegistry.ts b/node_modules/xterm/src/common/services/ServiceRegistry.ts
new file mode 100644 (file)
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+++ b/node_modules/xterm/src/common/services/ServiceRegistry.ts
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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;
+  }
+}