Move FileCopyManager to background page.

chrome/browser/resources/file_manager/js/path_util.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * Type of a root directory.
+ * @enum
+ */
+var RootType = {
+  DOWNLOADS: 'downloads',
+  ARCHIVE: 'archive',
+  REMOVABLE: 'removable',
+  GDATA: 'gdata'
+};
+
+/**
+ * Top directory for each root type.
+ * @type {Object.<RootType,string>}
+ */
+var RootDirectory = {
+  DOWNLOADS: '/Downloads',
+  ARCHIVE: '/archive',
+  REMOVABLE: '/removable',
+  GDATA: '/drive'
+};
+
+var PathUtil = {};
+
+/**
+ * @param {string} path Path starting with '/'.
+ * @return {string} Root directory (starting with '/').
+ */
+PathUtil.getRootDirectory = function(path) {
+  var i = path.indexOf('/', 1);
+  return i === -1 ? path.substring(0) : path.substring(0, i);
+};
+
+/**
+ * @param {string} path Any unix-style path (may start or not start from root).
+ * @return {Array.<string>} path components
+ */
+PathUtil.split = function(path) {
+  var fromRoot = false;
+  if (path[0] === '/') {
+    fromRoot = true;
+    path = path.substring(1);
+  }
+
+  var components = path.split('/');
+  if (fromRoot)
+    components[0] = '/' + components[0];
+  return components;
+};
+
+/**
+ * Join path components into a single path. Can be called either with a list of
+ * components as arguments, or with an array of components as the only argument.
+ *
+ * Examples:
+ * Path.join('abc', 'def') -> 'abc/def'
+ * Path.join('/', 'abc', 'def/ghi') -> '/abc/def/ghi'
+ * Path.join(['/abc/def', 'ghi']) -> '/abc/def/ghi'
+ *
+ * @return {string} Resulting path.
+ */
+PathUtil.join = function() {
+  var components;
+
+  if (arguments.length === 1 && typeof(arguments[0]) === 'object') {
+    components = arguments[0];
+  } else {
+    components = arguments;
+  }
+
+  var path = '';
+  for (var i = 0; i < components.length; i++) {
+    if (components[i][0] === '/') {
+      path = components[i];
+      continue;
+    }
+    if (path.length === 0 || path[path.length - 1] !== '/')
+      path += '/';
+    path += components[i];
+  }
+  return path;
+};
+
+/**
+ * @param {string} path Path starting with '/'.
+ * @return {RootType} RootType.DOWNLOADS, RootType.GDATA etc.
+ */
+PathUtil.getRootType = function(path) {
+  var rootDir = PathUtil.getRootDirectory(path);
+  for (var type in RootDirectory) {
+    if (rootDir === RootDirectory[type])
+      return RootType[type];
+  }
+};
+
+/**
+ * @param {string} path Any path.
+ * @return {string} The root path.
+ */
+PathUtil.getRootPath = function(path) {
+  var type = PathUtil.getRootType(path);
+
+  if (type == RootType.DOWNLOADS || type == RootType.GDATA)
+    return PathUtil.getRootDirectory(path);
+
+  if (type == RootType.ARCHIVE || type == RootType.REMOVABLE) {
+    var components = PathUtil.split(path);
+    if (components.length > 1) {
+      return PathUtil.join(components[0], components[1]);
+    } else {
+      return components[0];
+    }
+  }
+
+  return '/';
+};
+
+/**
+ * @param {string} path A path.
+ * @return {boolean} True if it is a path to the root.
+ */
+PathUtil.isRootPath = function(path) {
+  return PathUtil.getRootPath(path) === path;
+};
+