Add third_party/google-input-tools: Take 2

third_party/google_input_tools/third_party/closure_library/closure/goog/dom/classes.js

Index: third_party/google_input_tools/third_party/closure_library/closure/goog/dom/classes.js
diff --git a/third_party/google_input_tools/third_party/closure_library/closure/goog/dom/classes.js b/third_party/google_input_tools/third_party/closure_library/closure/goog/dom/classes.js
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+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for adding, removing and setting classes.  Prefer
+ * {@link goog.dom.classlist} over these utilities since goog.dom.classlist
+ * conforms closer to the semantics of Element.classList, is faster (uses
+ * native methods rather than parsing strings on every call) and compiles
+ * to smaller code as a result.
+ *
+ * Note: these utilities are meant to operate on HTMLElements and
+ * will not work on elements with differing interfaces (such as SVGElements).
+ *
+ */
+
+
+goog.provide('goog.dom.classes');
+
+goog.require('goog.array');
+
+
+/**
+ * Sets the entire class name of an element.
+ * @param {Node} element DOM node to set class of.
+ * @param {string} className Class name(s) to apply to element.
+ */
+goog.dom.classes.set = function(element, className) {
+  element.className = className;
+};
+
+
+/**
+ * Gets an array of class names on an element
+ * @param {Node} element DOM node to get class of.
+ * @return {!Array} Class names on {@code element}. Some browsers add extra
+ *     properties to the array. Do not depend on any of these!
+ */
+goog.dom.classes.get = function(element) {
+  var className = element.className;
+  // Some types of elements don't have a className in IE (e.g. iframes).
+  // Furthermore, in Firefox, className is not a string when the element is
+  // an SVG element.
+  return goog.isString(className) && className.match(/\S+/g) || [];
+};
+
+
+/**
+ * Adds a class or classes to an element. Does not add multiples of class names.
+ * @param {Node} element DOM node to add class to.
+ * @param {...string} var_args Class names to add.
+ * @return {boolean} Whether class was added (or all classes were added).
+ */
+goog.dom.classes.add = function(element, var_args) {
+  var classes = goog.dom.classes.get(element);
+  var args = goog.array.slice(arguments, 1);
+  var expectedCount = classes.length + args.length;
+  goog.dom.classes.add_(classes, args);
+  goog.dom.classes.set(element, classes.join(' '));
+  return classes.length == expectedCount;
+};
+
+
+/**
+ * Removes a class or classes from an element.
+ * @param {Node} element DOM node to remove class from.
+ * @param {...string} var_args Class name(s) to remove.
+ * @return {boolean} Whether all classes in {@code var_args} were found and
+ *     removed.
+ */
+goog.dom.classes.remove = function(element, var_args) {
+  var classes = goog.dom.classes.get(element);
+  var args = goog.array.slice(arguments, 1);
+  var newClasses = goog.dom.classes.getDifference_(classes, args);
+  goog.dom.classes.set(element, newClasses.join(' '));
+  return newClasses.length == classes.length - args.length;
+};
+
+
+/**
+ * Helper method for {@link goog.dom.classes.add} and
+ * {@link goog.dom.classes.addRemove}. Adds one or more classes to the supplied
+ * classes array.
+ * @param {Array.<string>} classes All class names for the element, will be
+ *     updated to have the classes supplied in {@code args} added.
+ * @param {Array.<string>} args Class names to add.
+ * @private
+ */
+goog.dom.classes.add_ = function(classes, args) {
+  for (var i = 0; i < args.length; i++) {
+    if (!goog.array.contains(classes, args[i])) {
+      classes.push(args[i]);
+    }
+  }
+};
+
+
+/**
+ * Helper method for {@link goog.dom.classes.remove} and
+ * {@link goog.dom.classes.addRemove}. Calculates the difference of two arrays.
+ * @param {!Array.<string>} arr1 First array.
+ * @param {!Array.<string>} arr2 Second array.
+ * @return {!Array.<string>} The first array without the elements of the second
+ *     array.
+ * @private
+ */
+goog.dom.classes.getDifference_ = function(arr1, arr2) {
+  return goog.array.filter(arr1, function(item) {
+    return !goog.array.contains(arr2, item);
+  });
+};
+
+
+/**
+ * Switches a class on an element from one to another without disturbing other
+ * classes. If the fromClass isn't removed, the toClass won't be added.
+ * @param {Node} element DOM node to swap classes on.
+ * @param {string} fromClass Class to remove.
+ * @param {string} toClass Class to add.
+ * @return {boolean} Whether classes were switched.
+ */
+goog.dom.classes.swap = function(element, fromClass, toClass) {
+  var classes = goog.dom.classes.get(element);
+
+  var removed = false;
+  for (var i = 0; i < classes.length; i++) {
+    if (classes[i] == fromClass) {
+      goog.array.splice(classes, i--, 1);
+      removed = true;
+    }
+  }
+
+  if (removed) {
+    classes.push(toClass);
+    goog.dom.classes.set(element, classes.join(' '));
+  }
+
+  return removed;
+};
+
+
+/**
+ * Adds zero or more classes to an element and removes zero or more as a single
+ * operation. Unlike calling {@link goog.dom.classes.add} and
+ * {@link goog.dom.classes.remove} separately, this is more efficient as it only
+ * parses the class property once.
+ *
+ * If a class is in both the remove and add lists, it will be added. Thus,
+ * you can use this instead of {@link goog.dom.classes.swap} when you have
+ * more than two class names that you want to swap.
+ *
+ * @param {Node} element DOM node to swap classes on.
+ * @param {?(string|Array.<string>)} classesToRemove Class or classes to
+ *     remove, if null no classes are removed.
+ * @param {?(string|Array.<string>)} classesToAdd Class or classes to add, if
+ *     null no classes are added.
+ */
+goog.dom.classes.addRemove = function(element, classesToRemove, classesToAdd) {
+  var classes = goog.dom.classes.get(element);
+  if (goog.isString(classesToRemove)) {
+    goog.array.remove(classes, classesToRemove);
+  } else if (goog.isArray(classesToRemove)) {
+    classes = goog.dom.classes.getDifference_(classes, classesToRemove);
+  }
+
+  if (goog.isString(classesToAdd) &&
+      !goog.array.contains(classes, classesToAdd)) {
+    classes.push(classesToAdd);
+  } else if (goog.isArray(classesToAdd)) {
+    goog.dom.classes.add_(classes, classesToAdd);
+  }
+
+  goog.dom.classes.set(element, classes.join(' '));
+};
+
+
+/**
+ * Returns true if an element has a class.
+ * @param {Node} element DOM node to test.
+ * @param {string} className Class name to test for.
+ * @return {boolean} Whether element has the class.
+ */
+goog.dom.classes.has = function(element, className) {
+  return goog.array.contains(goog.dom.classes.get(element), className);
+};
+
+
+/**
+ * Adds or removes a class depending on the enabled argument.
+ * @param {Node} element DOM node to add or remove the class on.
+ * @param {string} className Class name to add or remove.
+ * @param {boolean} enabled Whether to add or remove the class (true adds,
+ *     false removes).
+ */
+goog.dom.classes.enable = function(element, className, enabled) {
+  if (enabled) {
+    goog.dom.classes.add(element, className);
+  } else {
+    goog.dom.classes.remove(element, className);
+  }
+};
+
+
+/**
+ * Removes a class if an element has it, and adds it the element doesn't have
+ * it.  Won't affect other classes on the node.
+ * @param {Node} element DOM node to toggle class on.
+ * @param {string} className Class to toggle.
+ * @return {boolean} True if class was added, false if it was removed
+ *     (in other words, whether element has the class after this function has
+ *     been called).
+ */
+goog.dom.classes.toggle = function(element, className) {
+  var add = !goog.dom.classes.has(element, className);
+  goog.dom.classes.enable(element, className, add);
+  return add;
+};