Update to VS Code 1.52.1

lib/vscode/src/vs/platform/keyboardLayout/common/keyboardMapper.ts

@@ -0,0 +1,49 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Keybinding, ResolvedKeybinding, SimpleKeybinding } from 'vs/base/common/keyCodes';
+import { ScanCodeBinding } from 'vs/base/common/scanCode';
+import { IKeyboardEvent } from 'vs/platform/keybinding/common/keybinding';
+
+export interface IKeyboardMapper {
+	dumpDebugInfo(): string;
+	resolveKeybinding(keybinding: Keybinding): ResolvedKeybinding[];
+	resolveKeyboardEvent(keyboardEvent: IKeyboardEvent): ResolvedKeybinding;
+	resolveUserBinding(firstPart: (SimpleKeybinding | ScanCodeBinding)[]): ResolvedKeybinding[];
+}
+
+export class CachedKeyboardMapper implements IKeyboardMapper {
+
+	private _actual: IKeyboardMapper;
+	private _cache: Map<string, ResolvedKeybinding[]>;
+
+	constructor(actual: IKeyboardMapper) {
+		this._actual = actual;
+		this._cache = new Map<string, ResolvedKeybinding[]>();
+	}
+
+	public dumpDebugInfo(): string {
+		return this._actual.dumpDebugInfo();
+	}
+
+	public resolveKeybinding(keybinding: Keybinding): ResolvedKeybinding[] {
+		const hashCode = keybinding.getHashCode();
+		const resolved = this._cache.get(hashCode);
+		if (!resolved) {
+			const r = this._actual.resolveKeybinding(keybinding);
+			this._cache.set(hashCode, r);
+			return r;
+		}
+		return resolved;
+	}
+
+	public resolveKeyboardEvent(keyboardEvent: IKeyboardEvent): ResolvedKeybinding {
+		return this._actual.resolveKeyboardEvent(keyboardEvent);
+	}
+
+	public resolveUserBinding(parts: (SimpleKeybinding | ScanCodeBinding)[]): ResolvedKeybinding[] {
+		return this._actual.resolveUserBinding(parts);
+	}
+}