[css] split extension (for #45900)

extensions/css-language-features/server/src/utils/errors.ts

@@ -0,0 +1,33 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+export function formatError(message: string, err: any): string {
+	if (err instanceof Error) {
+		let error = <Error>err;
+		return `${message}: ${error.message}\n${error.stack}`;
+	} else if (typeof err === 'string') {
+		return `${message}: ${err}`;
+	} else if (err) {
+		return `${message}: ${err.toString()}`;
+	}
+	return message;
+}
+
+export function runSafe<T>(func: () => Thenable<T> | T, errorVal: T, errorMessage: string): Thenable<T> | T {
+	try {
+		let t = func();
+		if (t instanceof Promise) {
+			return t.then(void 0, e => {
+				console.error(formatError(errorMessage, e));
+				return errorVal;
+			});
+		}
+		return t;
+	} catch (e) {
+		console.error(formatError(errorMessage, e));
+		return errorVal;
+	}
+}

extensions/css-language-features/server/src/utils/strings.ts

@@ -0,0 +1,19 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+export function startsWith(haystack: string, needle: string): boolean {
+	if (haystack.length < needle.length) {
+		return false;
+	}
+
+	for (let i = 0; i < needle.length; i++) {
+		if (haystack[i] !== needle[i]) {
+			return false;
+		}
+	}
+
+	return true;
+}