add markdown-language-features to sqlops (#2338)

extensions/markdown-language-features/src/features/documentSymbolProvider.ts

@@ -0,0 +1,23 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 { MarkdownEngine } from '../markdownEngine';
+import { TableOfContentsProvider } from '../tableOfContentsProvider';
+
+
+export default class MDDocumentSymbolProvider implements vscode.DocumentSymbolProvider {
+
+	constructor(
+		private readonly engine: MarkdownEngine
+	) { }
+
+	public async provideDocumentSymbols(document: vscode.TextDocument): Promise<vscode.SymbolInformation[]> {
+		const toc = await new TableOfContentsProvider(this.engine, document).getToc();
+		return toc.map(entry => {
+			return new vscode.SymbolInformation('#'.repeat(entry.level) + ' ' + entry.text, vscode.SymbolKind.String, '', entry.location);
+		});
+	}
+}