Merge from vscode 10492ba146318412cbee8b76a8c630f226914734

src/sql/base/common/navigator.ts

@@ -0,0 +1,23 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { INavigator as vsINavigator } from 'vs/base/common/navigator';
+
+export interface INavigator<T> extends vsINavigator<T> {
+	parent(): T | null;
+}
+
+export class MappedNavigator<T, R> implements INavigator<R> {
+
+	constructor(protected navigator: INavigator<T>, private fn: (item: T | null) => R) {
+	}
+
+	current() { return this.fn(this.navigator.current()); }
+	previous() { return this.fn(this.navigator.previous()); }
+	first() { return this.fn(this.navigator.first()); }
+	last() { return this.fn(this.navigator.last()); }
+	next() { return this.fn(this.navigator.next()); }
+	parent() { return this.fn(this.navigator.parent()); }
+}