Check in stubbed out smart select support for js/ts

For https://github.com/Microsoft/TypeScript/issues/29071

This require upstream TS support. Check in experimental support so that TS team can test the ux of this feature

extensions/typescript-language-features/src/features/smartSelect.ts

@@ -0,0 +1,57 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import * as Proto from '../protocol';
+import { ITypeScriptServiceClient } from '../typescriptService';
+import API from '../utils/api';
+import { VersionDependentRegistration } from '../utils/dependentRegistration';
+import * as typeConverters from '../utils/typeConverters';
+
+class SmartSelection implements vscode.SelectionRangeProvider {
+	public static readonly minVersion = API.v350;
+
+	public constructor(
+		private readonly client: ITypeScriptServiceClient
+	) { }
+
+	public async provideSelectionRanges(
+		document: vscode.TextDocument,
+		positions: vscode.Position[],
+		token: vscode.CancellationToken,
+	): Promise<vscode.SelectionRange[] | undefined> {
+		const file = this.client.toOpenedFilePath(document);
+		if (!file) {
+			return undefined;
+		}
+
+		const args: Proto.FileRequestArgs & { locations: Proto.Location[] } = {
+			file,
+			locations: positions.map(typeConverters.Position.toLocation)
+		};
+		const response = await this.client.execute('selectionRange', args, token);
+		if (response.type !== 'response' || !response.body) {
+			return undefined;
+		}
+		return response.body.map(SmartSelection.convertSelectionRange);
+	}
+
+	private static convertSelectionRange(
+		selectionRange: Proto.SelectionRange
+	): vscode.SelectionRange {
+		return new vscode.SelectionRange(
+			typeConverters.Range.fromTextSpan(selectionRange.textSpan),
+			selectionRange.parent ? SmartSelection.convertSelectionRange(selectionRange.parent) : undefined,
+		);
+	}
+}
+
+export function register(
+	selector: vscode.DocumentSelector,
+	client: ITypeScriptServiceClient,
+) {
+	return new VersionDependentRegistration(client, SmartSelection.minVersion, () =>
+		vscode.languages.registerSelectionRangeProvider(selector, new SmartSelection(client)));
+}

extensions/typescript-language-features/src/languageProvider.ts

@@ -73,6 +73,7 @@ export default class LanguageProvider extends Disposable {
 		this._register((await import('./features/references')).register(selector, this.client));
 		this._register((await import('./features/referencesCodeLens')).register(selector, this.description.id, this.client, cachedResponse));
 		this._register((await import('./features/rename')).register(selector, this.client, this.fileConfigurationManager));
+		this._register((await import('./features/smartSelect')).register(selector, this.client));
 		this._register((await import('./features/signatureHelp')).register(selector, this.client));
 		this._register((await import('./features/tagClosing')).register(selector, this.description.id, this.client));
 		this._register((await import('./features/typeDefinitions')).register(selector, this.client));

extensions/typescript-language-features/src/typescriptService.ts

@@ -11,6 +11,17 @@ import { TypeScriptServiceConfiguration } from './utils/configuration';
 import Logger from './utils/logger';
 import { PluginManager } from './utils/plugins';
 
+declare module './protocol' {
+	interface SelectionRange {
+		textSpan: Proto.TextSpan;
+		parent?: SelectionRange;
+	}
+
+	interface SelectionRangeResponse extends Proto.Response {
+		body?: ReadonlyArray<SelectionRange>;
+	}
+}
+
 export namespace ServerResponse {
 
 	export class Cancelled {
@@ -54,6 +65,7 @@ export interface TypeScriptRequestTypes {
 	'quickinfo': [Proto.FileLocationRequestArgs, Proto.QuickInfoResponse];
 	'references': [Proto.FileLocationRequestArgs, Proto.ReferencesResponse];
 	'rename': [Proto.RenameRequestArgs, Proto.RenameResponse];
+	'selectionRange': [Proto.FileRequestArgs & { locations: Proto.Location[] }, Proto.SelectionRangeResponse];
 	'signatureHelp': [Proto.SignatureHelpRequestArgs, Proto.SignatureHelpResponse];
 	'typeDefinition': [Proto.FileLocationRequestArgs, Proto.TypeDefinitionResponse];
 }

extensions/typescript-language-features/src/utils/api.ts

@@ -36,6 +36,7 @@ export default class API {
 	public static readonly v330 = API.fromSimpleString('3.3.0');
 	public static readonly v333 = API.fromSimpleString('3.3.3');
 	public static readonly v340 = API.fromSimpleString('3.4.0');
+	public static readonly v350 = API.fromSimpleString('3.5.0');
 
 
 	public static fromVersionString(versionString: string): API {