update

node_modules/enhanced-resolve/lib/DescriptionFileUtils.js

@@ -0,0 +1,109 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const forEachBail = require("./forEachBail");
+
+function loadDescriptionFile(
+	resolver,
+	directory,
+	filenames,
+	resolveContext,
+	callback
+) {
+	(function findDescriptionFile() {
+		forEachBail(
+			filenames,
+			(filename, callback) => {
+				const descriptionFilePath = resolver.join(directory, filename);
+				if (resolver.fileSystem.readJson) {
+					resolver.fileSystem.readJson(descriptionFilePath, (err, content) => {
+						if (err) {
+							if (typeof err.code !== "undefined") return callback();
+							return onJson(err);
+						}
+						onJson(null, content);
+					});
+				} else {
+					resolver.fileSystem.readFile(descriptionFilePath, (err, content) => {
+						if (err) return callback();
+						let json;
+						try {
+							json = JSON.parse(content);
+						} catch (e) {
+							onJson(e);
+						}
+						onJson(null, json);
+					});
+				}
+
+				function onJson(err, content) {
+					if (err) {
+						if (resolveContext.log)
+							resolveContext.log(
+								descriptionFilePath + " (directory description file): " + err
+							);
+						else
+							err.message =
+								descriptionFilePath + " (directory description file): " + err;
+						return callback(err);
+					}
+					callback(null, {
+						content: content,
+						directory: directory,
+						path: descriptionFilePath
+					});
+				}
+			},
+			(err, result) => {
+				if (err) return callback(err);
+				if (result) {
+					return callback(null, result);
+				} else {
+					directory = cdUp(directory);
+					if (!directory) {
+						return callback();
+					} else {
+						return findDescriptionFile();
+					}
+				}
+			}
+		);
+	})();
+}
+
+function getField(content, field) {
+	if (!content) return undefined;
+	if (Array.isArray(field)) {
+		let current = content;
+		for (let j = 0; j < field.length; j++) {
+			if (current === null || typeof current !== "object") {
+				current = null;
+				break;
+			}
+			current = current[field[j]];
+		}
+		if (typeof current === "object") {
+			return current;
+		}
+	} else {
+		if (typeof content[field] === "object") {
+			return content[field];
+		}
+	}
+}
+
+function cdUp(directory) {
+	if (directory === "/") return null;
+	const i = directory.lastIndexOf("/"),
+		j = directory.lastIndexOf("\\");
+	const p = i < 0 ? j : j < 0 ? i : i < j ? j : i;
+	if (p < 0) return null;
+	return directory.substr(0, p || 1);
+}
+
+exports.loadDescriptionFile = loadDescriptionFile;
+exports.getField = getField;
+exports.cdUp = cdUp;