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diff --git a/contexts/data/lib/closure-library/closure/goog/dom/classes.js b/contexts/data/lib/closure-library/closure/goog/dom/classes.js
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--- a/contexts/data/lib/closure-library/closure/goog/dom/classes.js
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@@ -1,223 +0,0 @@
-// 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.
- *
- * 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);
- element.className = 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);
- element.className = 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);
- element.className = 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);
- }
-
- element.className = 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;
-};