Merge commit 'be3e8236086165e5e45a5a10783823874b3f3ebd' as 'lib/vscode'

lib/vscode/extensions/markdown-language-features/src/util/links.ts

@@ -0,0 +1,47 @@
+/*---------------------------------------------------------------------------------------------
+ *  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';
+
+export const Schemes = {
+	http: 'http:',
+	https: 'https:',
+	file: 'file:',
+	untitled: 'untitled',
+	mailto: 'mailto:',
+	data: 'data:',
+	vscode: 'vscode:',
+	'vscode-insiders': 'vscode-insiders:',
+	'vscode-resource': 'vscode-resource:',
+};
+
+const knownSchemes = [
+	...Object.values(Schemes),
+	`${vscode.env.uriScheme}:`
+];
+
+export function getUriForLinkWithKnownExternalScheme(link: string): vscode.Uri | undefined {
+	if (knownSchemes.some(knownScheme => isOfScheme(knownScheme, link))) {
+		return vscode.Uri.parse(link);
+	}
+
+	return undefined;
+}
+
+export function isOfScheme(scheme: string, link: string): boolean {
+	return link.toLowerCase().startsWith(scheme);
+}
+
+export const MarkdownFileExtensions: readonly string[] = [
+	'.md',
+	'.mkd',
+	'.mdwn',
+	'.mdown',
+	'.markdown',
+	'.markdn',
+	'.mdtxt',
+	'.mdtext',
+	'.workbook',
+];