Merge commit 'be3e8236086165e5e45a5a10783823874b3f3ebd' as 'lib/vscode'

lib/vscode/extensions/emmet/src/locateFile.ts

@@ -0,0 +1,85 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+// Based on @sergeche's work on the emmet plugin for atom
+// TODO: Move to https://github.com/emmetio/file-utils
+
+
+
+import * as path from 'path';
+import * as fs from 'fs';
+
+const reAbsolutePosix = /^\/+/;
+const reAbsoluteWin32 = /^\\+/;
+const reAbsolute = path.sep === '/' ? reAbsolutePosix : reAbsoluteWin32;
+
+/**
+ * Locates given `filePath` on user’s file system and returns absolute path to it.
+ * This method expects either URL, or relative/absolute path to resource
+ * @param basePath Base path to use if filePath is not absoulte
+ * @param filePath File to locate.
+ */
+export function locateFile(base: string, filePath: string): Promise<string> {
+	if (/^\w+:/.test(filePath)) {
+		// path with protocol, already absolute
+		return Promise.resolve(filePath);
+	}
+
+	filePath = path.normalize(filePath);
+
+	return reAbsolute.test(filePath)
+		? resolveAbsolute(base, filePath)
+		: resolveRelative(base, filePath);
+}
+
+/**
+ * Resolves relative file path
+ */
+function resolveRelative(basePath: string, filePath: string): Promise<string> {
+	return tryFile(path.resolve(basePath, filePath));
+}
+
+/**
+ * Resolves absolute file path agaist given editor: tries to find file in every
+ * parent of editor’s file
+ */
+function resolveAbsolute(basePath: string, filePath: string): Promise<string> {
+	return new Promise((resolve, reject) => {
+		filePath = filePath.replace(reAbsolute, '');
+
+		const next = (ctx: string) => {
+			tryFile(path.resolve(ctx, filePath))
+				.then(resolve, () => {
+					const dir = path.dirname(ctx);
+					if (!dir || dir === ctx) {
+						return reject(`Unable to locate absolute file ${filePath}`);
+					}
+
+					next(dir);
+				});
+		};
+
+		next(basePath);
+	});
+}
+
+/**
+ * Check if given file exists and it’s a file, not directory
+ */
+function tryFile(file: string): Promise<string> {
+	return new Promise((resolve, reject) => {
+		fs.stat(file, (err, stat) => {
+			if (err) {
+				return reject(err);
+			}
+
+			if (!stat.isFile()) {
+				return reject(new Error(`${file} is not a file`));
+			}
+
+			resolve(file);
+		});
+	});
+}