Add third_party/google-input-tools: Take 2

third_party/google_input_tools/third_party/closure_library/closure/goog/a11y/aria/aria.js

Index: third_party/google_input_tools/third_party/closure_library/closure/goog/a11y/aria/aria.js
diff --git a/third_party/google_input_tools/third_party/closure_library/closure/goog/a11y/aria/aria.js b/third_party/google_input_tools/third_party/closure_library/closure/goog/a11y/aria/aria.js
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+// Copyright 2007 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 ARIA roles and
+ * states as defined by W3C ARIA standard: http://www.w3.org/TR/wai-aria/
+ * All modern browsers have some form of ARIA support, so no browser checks are
+ * performed when adding ARIA to components.
+ *
+ */
+
+goog.provide('goog.a11y.aria');
+
+goog.require('goog.a11y.aria.Role');
+goog.require('goog.a11y.aria.State');
+goog.require('goog.a11y.aria.datatables');
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.dom.TagName');
+goog.require('goog.object');
+
+
+/**
+ * ARIA states/properties prefix.
+ * @private
+ */
+goog.a11y.aria.ARIA_PREFIX_ = 'aria-';
+
+
+/**
+ * ARIA role attribute.
+ * @private
+ */
+goog.a11y.aria.ROLE_ATTRIBUTE_ = 'role';
+
+
+/**
+ * A list of tag names for which we don't need to set ARIA role and states
+ * because they have well supported semantics for screen readers or because
+ * they don't contain content to be made accessible.
+ * @private
+ */
+goog.a11y.aria.TAGS_WITH_ASSUMED_ROLES_ = [
+  goog.dom.TagName.A,
+  goog.dom.TagName.AREA,
+  goog.dom.TagName.BUTTON,
+  goog.dom.TagName.HEAD,
+  goog.dom.TagName.INPUT,
+  goog.dom.TagName.LINK,
+  goog.dom.TagName.MENU,
+  goog.dom.TagName.META,
+  goog.dom.TagName.OPTGROUP,
+  goog.dom.TagName.OPTION,
+  goog.dom.TagName.PROGRESS,
+  goog.dom.TagName.STYLE,
+  goog.dom.TagName.SELECT,
+  goog.dom.TagName.SOURCE,
+  goog.dom.TagName.TEXTAREA,
+  goog.dom.TagName.TITLE,
+  goog.dom.TagName.TRACK
+];
+
+
+/**
+ * Sets the role of an element. If the roleName is
+ * empty string or null, the role for the element is removed.
+ * We encourage clients to call the goog.a11y.aria.removeRole
+ * method instead of setting null and empty string values.
+ * Special handling for this case is added to ensure
+ * backword compatibility with existing code.
+ *
+ * @param {!Element} element DOM node to set role of.
+ * @param {!goog.a11y.aria.Role|string} roleName role name(s).
+ */
+goog.a11y.aria.setRole = function(element, roleName) {
+  if (!roleName) {
+    // Setting the ARIA role to empty string is not allowed
+    // by the ARIA standard.
+    goog.a11y.aria.removeRole(element);
+  } else {
+    if (goog.asserts.ENABLE_ASSERTS) {
+      goog.asserts.assert(goog.object.containsValue(
+          goog.a11y.aria.Role, roleName), 'No such ARIA role ' + roleName);
+    }
+    element.setAttribute(goog.a11y.aria.ROLE_ATTRIBUTE_, roleName);
+  }
+};
+
+
+/**
+ * Gets role of an element.
+ * @param {!Element} element DOM element to get role of.
+ * @return {!goog.a11y.aria.Role} ARIA Role name.
+ */
+goog.a11y.aria.getRole = function(element) {
+  var role = element.getAttribute(goog.a11y.aria.ROLE_ATTRIBUTE_);
+  return /** @type {goog.a11y.aria.Role} */ (role) || null;
+};
+
+
+/**
+ * Removes role of an element.
+ * @param {!Element} element DOM element to remove the role from.
+ */
+goog.a11y.aria.removeRole = function(element) {
+  element.removeAttribute(goog.a11y.aria.ROLE_ATTRIBUTE_);
+};
+
+
+/**
+ * Sets the state or property of an element.
+ * @param {!Element} element DOM node where we set state.
+ * @param {!(goog.a11y.aria.State|string)} stateName State attribute being set.
+ *     Automatically adds prefix 'aria-' to the state name if the attribute is
+ *     not an extra attribute.
+ * @param {string|boolean|number|!goog.array.ArrayLike.<string>} value Value
+ * for the state attribute.
+ */
+goog.a11y.aria.setState = function(element, stateName, value) {
+  if (goog.isArrayLike(value)) {
+    var array = /** @type {!goog.array.ArrayLike.<string>} */ (value);
+    value = array.join(' ');
+  }
+  var attrStateName = goog.a11y.aria.getAriaAttributeName_(stateName);
+  if (value === '' || value == undefined) {
+    var defaultValueMap = goog.a11y.aria.datatables.getDefaultValuesMap();
+    // Work around for browsers that don't properly support ARIA.
+    // According to the ARIA W3C standard, user agents should allow
+    // setting empty value which results in setting the default value
+    // for the ARIA state if such exists. The exact text from the ARIA W3C
+    // standard (http://www.w3.org/TR/wai-aria/states_and_properties):
+    // "When a value is indicated as the default, the user agent
+    // MUST follow the behavior prescribed by this value when the state or
+    // property is empty or undefined."
+    // The defaultValueMap contains the default values for the ARIA states
+    // and has as a key the goog.a11y.aria.State constant for the state.
+    if (stateName in defaultValueMap) {
+      element.setAttribute(attrStateName, defaultValueMap[stateName]);
+    } else {
+      element.removeAttribute(attrStateName);
+    }
+  } else {
+    element.setAttribute(attrStateName, value);
+  }
+};
+
+
+/**
+ * Remove the state or property for the element.
+ * @param {!Element} element DOM node where we set state.
+ * @param {!goog.a11y.aria.State} stateName State name.
+ */
+goog.a11y.aria.removeState = function(element, stateName) {
+  element.removeAttribute(goog.a11y.aria.getAriaAttributeName_(stateName));
+};
+
+
+/**
+ * Gets value of specified state or property.
+ * @param {!Element} element DOM node to get state from.
+ * @param {!goog.a11y.aria.State|string} stateName State name.
+ * @return {string} Value of the state attribute.
+ */
+goog.a11y.aria.getState = function(element, stateName) {
+  // TODO(user): return properly typed value result --
+  // boolean, number, string, null. We should be able to chain
+  // getState(...) and setState(...) methods.
+
+  var attr =
+      /** @type {string|number|boolean} */ (element.getAttribute(
+      goog.a11y.aria.getAriaAttributeName_(stateName)));
+  var isNullOrUndefined = attr == null || attr == undefined;
+  return isNullOrUndefined ? '' : String(attr);
+};
+
+
+/**
+ * Returns the activedescendant element for the input element by
+ * using the activedescendant ARIA property of the given element.
+ * @param {!Element} element DOM node to get activedescendant
+ *     element for.
+ * @return {?Element} DOM node of the activedescendant, if found.
+ */
+goog.a11y.aria.getActiveDescendant = function(element) {
+  var id = goog.a11y.aria.getState(
+      element, goog.a11y.aria.State.ACTIVEDESCENDANT);
+  return goog.dom.getOwnerDocument(element).getElementById(id);
+};
+
+
+/**
+ * Sets the activedescendant ARIA property value for an element.
+ * If the activeElement is not null, it should have an id set.
+ * @param {!Element} element DOM node to set activedescendant ARIA property to.
+ * @param {?Element} activeElement DOM node being set as activedescendant.
+ */
+goog.a11y.aria.setActiveDescendant = function(element, activeElement) {
+  var id = '';
+  if (activeElement) {
+    id = activeElement.id;
+    goog.asserts.assert(id, 'The active element should have an id.');
+  }
+
+  goog.a11y.aria.setState(element, goog.a11y.aria.State.ACTIVEDESCENDANT, id);
+};
+
+
+/**
+ * Gets the label of the given element.
+ * @param {!Element} element DOM node to get label from.
+ * @return {string} label The label.
+ */
+goog.a11y.aria.getLabel = function(element) {
+  return goog.a11y.aria.getState(element, goog.a11y.aria.State.LABEL);
+};
+
+
+/**
+ * Sets the label of the given element.
+ * @param {!Element} element DOM node to set label to.
+ * @param {string} label The label to set.
+ */
+goog.a11y.aria.setLabel = function(element, label) {
+  goog.a11y.aria.setState(element, goog.a11y.aria.State.LABEL, label);
+};
+
+
+/**
+ * Asserts that the element has a role set if it's not an HTML element whose
+ * semantics is well supported by most screen readers.
+ * Only to be used internally by the ARIA library in goog.a11y.aria.*.
+ * @param {!Element} element The element to assert an ARIA role set.
+ * @param {!goog.array.ArrayLike.<string>} allowedRoles The child roles of
+ * the roles.
+ */
+goog.a11y.aria.assertRoleIsSetInternalUtil = function(element, allowedRoles) {
+  if (goog.array.contains(goog.a11y.aria.TAGS_WITH_ASSUMED_ROLES_,
+      element.tagName)) {
+    return;
+  }
+  var elementRole = /** @type {string}*/ (goog.a11y.aria.getRole(element));
+  goog.asserts.assert(elementRole != null,
+      'The element ARIA role cannot be null.');
+
+  goog.asserts.assert(goog.array.contains(allowedRoles, elementRole),
+      'Non existing or incorrect role set for element.' +
+      'The role set is "' + elementRole +
+      '". The role should be any of "' + allowedRoles +
+      '". Check the ARIA specification for more details ' +
+      'http://www.w3.org/TR/wai-aria/roles.');
+};
+
+
+/**
+ * Gets the boolean value of an ARIA state/property.
+ * @param {!Element} element The element to get the ARIA state for.
+ * @param {!goog.a11y.aria.State|string} stateName the ARIA state name.
+ * @return {?boolean} Boolean value for the ARIA state value or null if
+ *     the state value is not 'true', not 'false', or not set.
+ */
+goog.a11y.aria.getStateBoolean = function(element, stateName) {
+  var attr =
+      /** @type {string|boolean} */ (element.getAttribute(
+          goog.a11y.aria.getAriaAttributeName_(stateName)));
+  goog.asserts.assert(
+      goog.isBoolean(attr) || attr == null || attr == 'true' ||
+          attr == 'false');
+  if (attr == null) {
+    return attr;
+  }
+  return goog.isBoolean(attr) ? attr : attr == 'true';
+};
+
+
+/**
+ * Gets the number value of an ARIA state/property.
+ * @param {!Element} element The element to get the ARIA state for.
+ * @param {!goog.a11y.aria.State|string} stateName the ARIA state name.
+ * @return {?number} Number value for the ARIA state value or null if
+ *     the state value is not a number or not set.
+ */
+goog.a11y.aria.getStateNumber = function(element, stateName) {
+  var attr =
+      /** @type {string|number} */ (element.getAttribute(
+          goog.a11y.aria.getAriaAttributeName_(stateName)));
+  goog.asserts.assert((attr == null || !isNaN(Number(attr))) &&
+      !goog.isBoolean(attr));
+  return attr == null ? null : Number(attr);
+};
+
+
+/**
+ * Gets the string value of an ARIA state/property.
+ * @param {!Element} element The element to get the ARIA state for.
+ * @param {!goog.a11y.aria.State|string} stateName the ARIA state name.
+ * @return {?string} String value for the ARIA state value or null if
+ *     the state value is empty string or not set.
+ */
+goog.a11y.aria.getStateString = function(element, stateName) {
+  var attr = element.getAttribute(
+      goog.a11y.aria.getAriaAttributeName_(stateName));
+  goog.asserts.assert((attr == null || goog.isString(attr)) &&
+      isNaN(Number(attr)) && attr != 'true' && attr != 'false');
+  return attr == null ? null : attr;
+};
+
+
+/**
+ * Gets array of strings value of the specified state or
+ * property for the element.
+ * Only to be used internally by the ARIA library in goog.a11y.aria.*.
+ * @param {!Element} element DOM node to get state from.
+ * @param {!goog.a11y.aria.State} stateName State name.
+ * @return {!goog.array.ArrayLike.<string>} string Array
+ *     value of the state attribute.
+ */
+goog.a11y.aria.getStringArrayStateInternalUtil = function(element, stateName) {
+  var attrValue = element.getAttribute(
+      goog.a11y.aria.getAriaAttributeName_(stateName));
+  return goog.a11y.aria.splitStringOnWhitespace_(attrValue);
+};
+
+
+/**
+ * Splits the input stringValue on whitespace.
+ * @param {string} stringValue The value of the string to split.
+ * @return {!goog.array.ArrayLike.<string>} string Array
+ *     value as result of the split.
+ * @private
+ */
+goog.a11y.aria.splitStringOnWhitespace_ = function(stringValue) {
+  return stringValue ? stringValue.split(/\s+/) : [];
+};
+
+
+/**
+ * Adds the 'aria-' prefix to ariaName.
+ * @param {string} ariaName ARIA state/property name.
+ * @private
+ * @return {string} The ARIA attribute name with added 'aria-' prefix.
+ * @throws {Error} If no such attribute exists.
+ */
+goog.a11y.aria.getAriaAttributeName_ = function(ariaName) {
+  if (goog.asserts.ENABLE_ASSERTS) {
+    goog.asserts.assert(ariaName, 'ARIA attribute cannot be empty.');
+    goog.asserts.assert(goog.object.containsValue(
+        goog.a11y.aria.State, ariaName),
+        'No such ARIA attribute ' + ariaName);
+  }
+  return goog.a11y.aria.ARIA_PREFIX_ + ariaName;
+};