Merge commit 'be3e8236086165e5e45a5a10783823874b3f3ebd' as 'lib/vscode'

lib/vscode/src/vs/base/browser/canIUse.ts

@@ -0,0 +1,58 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as browser from 'vs/base/browser/browser';
+import * as platform from 'vs/base/common/platform';
+
+export const enum KeyboardSupport {
+	Always,
+	FullScreen,
+	None
+}
+
+/**
+ * Browser feature we can support in current platform, browser and environment.
+ */
+export const BrowserFeatures = {
+	clipboard: {
+		writeText: (
+			platform.isNative
+			|| (document.queryCommandSupported && document.queryCommandSupported('copy'))
+			|| !!(navigator && navigator.clipboard && navigator.clipboard.writeText)
+		),
+		readText: (
+			platform.isNative
+			|| !!(navigator && navigator.clipboard && navigator.clipboard.readText)
+		),
+		richText: (() => {
+			if (browser.isEdge) {
+				let index = navigator.userAgent.indexOf('Edge/');
+				let version = parseInt(navigator.userAgent.substring(index + 5, navigator.userAgent.indexOf('.', index)), 10);
+
+				if (!version || (version >= 12 && version <= 16)) {
+					return false;
+				}
+			}
+
+			return true;
+		})()
+	},
+	keyboard: (() => {
+		if (platform.isNative || browser.isStandalone) {
+			return KeyboardSupport.Always;
+		}
+
+		if ((<any>navigator).keyboard || browser.isSafari) {
+			return KeyboardSupport.FullScreen;
+		}
+
+		return KeyboardSupport.None;
+	})(),
+
+	// 'ontouchstart' in window always evaluates to true with typescript's modern typings. This causes `window` to be
+	// `never` later in `window.navigator`. That's why we need the explicit `window as Window` cast
+	touch: 'ontouchstart' in window || navigator.maxTouchPoints > 0 || (window as Window).navigator.msMaxTouchPoints > 0,
+	pointerEvents: window.PointerEvent && ('ontouchstart' in window || (window as Window).navigator.maxTouchPoints > 0 || navigator.maxTouchPoints > 0 || (window as Window).navigator.msMaxTouchPoints > 0)
+};