Get rid of deprecated live regions code from ChromeVox

chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions_deprecated.js

Index: chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions_deprecated.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions_deprecated.js b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions_deprecated.js
deleted file mode 100644
index 034be6a39ef6f2d3ed5dbf46c0557f47b0e03667..0000000000000000000000000000000000000000
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions_deprecated.js
+++ /dev/null
@@ -1,244 +0,0 @@
-// Copyright 2014 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.
-
-/**
- * @fileoverview Keeps track of live regions on the page and speaks updates
- * when they change.
- *
- */
-
-goog.provide('cvox.LiveRegionsDeprecated');
-
-goog.require('cvox.AriaUtil');
-goog.require('cvox.ChromeVox');
-goog.require('cvox.DescriptionUtil');
-goog.require('cvox.DomUtil');
-goog.require('cvox.NavDescription');
-
-/**
- * @constructor
- */
-cvox.LiveRegionsDeprecated = function() {
-};
-
-/**
- * An array of all of the elements on the page that are live regions.
- * @type {Array.<Element>}
- */
-cvox.LiveRegionsDeprecated.trackedRegions = [];
-
-/**
- * A parallel array to trackedRegions that stores the previous value of
- * each live region, represented as an array of NavDescriptions.
- * @type {Array.<Array.<cvox.NavDescription> >}
- */
-cvox.LiveRegionsDeprecated.previousRegionValue = [];
-
-/**
- * @type {Date}
- */
-cvox.LiveRegionsDeprecated.pageLoadTime = null;
-
-/**
- * Time in milliseconds after initial page load to ignore live region
- * updates, to avoid announcing regions as they're initially created.
- * The exception is alerts, they're announced when a page is loaded.
- * @type {number}
- * @const
- */
-cvox.LiveRegionsDeprecated.INITIAL_SILENCE_MS = 2000;
-
-/**
- * @param {Date} pageLoadTime The time the page was loaded. Live region
- *     updates within the first INITIAL_SILENCE_MS milliseconds are ignored.
- * @param {number} queueMode Interrupt or flush.  Polite live region
- *   changes always queue.
- * @param {boolean} disableSpeak true if change announcement should be disabled.
- * @return {boolean} true if any regions announced.
- */
-cvox.LiveRegionsDeprecated.init = function(pageLoadTime, queueMode, disableSpeak) {
-  if (queueMode == undefined) {
-    queueMode = cvox.AbstractTts.QUEUE_MODE_FLUSH;
-  }
-
-  cvox.LiveRegionsDeprecated.pageLoadTime = pageLoadTime;
-
-  var anyRegionsAnnounced = false;
-  var regions = cvox.AriaUtil.getLiveRegions(document.body);
-  for (var i = 0; i < regions.length; i++) {
-    if (cvox.LiveRegionsDeprecated.updateLiveRegion(regions[i], queueMode,
-                                          disableSpeak)) {
-      anyRegionsAnnounced = true;
-      queueMode = cvox.AbstractTts.QUEUE_MODE_QUEUE;
-    }
-  }
-
-  return anyRegionsAnnounced;
-};
-
-/**
- * Speak relevant changes to a live region.
- *
- * @param {Node} region The live region node that changed.
- * @param {number} queueMode Interrupt or queue. Polite live region
- *   changes always queue.
- * @param {boolean} disableSpeak true if change announcement should be disabled.
- * @return {boolean} true if the region announced a change.
- */
-cvox.LiveRegionsDeprecated.updateLiveRegion = function(region, queueMode, disableSpeak) {
-  if (cvox.AriaUtil.getAriaBusy(region)) {
-    return false;
-  }
-
-  // Make sure it's visible.
-  if (!cvox.DomUtil.isVisible(region)) {
-    return false;
-  }
-
-  // Retrieve the previous value of this region if we've tracked it
-  // before, otherwise start tracking it.
-  var regionIndex = cvox.LiveRegionsDeprecated.trackedRegions.indexOf(region);
-  var previousValue;
-  if (regionIndex >= 0) {
-    previousValue = cvox.LiveRegionsDeprecated.previousRegionValue[regionIndex];
-  } else {
-    regionIndex = cvox.LiveRegionsDeprecated.trackedRegions.length;
-    previousValue = [];
-    cvox.LiveRegionsDeprecated.trackedRegions.push(region);
-    cvox.LiveRegionsDeprecated.previousRegionValue.push([]);
-  }
-
-  // Get the new value.
-  var currentValue = cvox.LiveRegionsDeprecated.buildCurrentLiveRegionValue(region);
-
-  // If the page just loaded and this is any region type other than 'alert',
-  // keep track of the new value but don't announce anything. Alerts are
-  // the exception, they're announced on page load.
-  var deltaTime = new Date() - cvox.LiveRegionsDeprecated.pageLoadTime;
-  if (cvox.AriaUtil.getRoleAttribute(region) != 'alert' &&
-      deltaTime < cvox.LiveRegionsDeprecated.INITIAL_SILENCE_MS) {
-    cvox.LiveRegionsDeprecated.previousRegionValue[regionIndex] = currentValue;
-    return false;
-  }
-
-  // Don't announce alerts on page load if their text and values consist of
-  // just whitespace.
-  if (cvox.AriaUtil.getRoleAttribute(region) == 'alert' &&
-      deltaTime < cvox.LiveRegionsDeprecated.INITIAL_SILENCE_MS) {
-    var regionText = '';
-    for (var i = 0; i < currentValue.length; i++) {
-      regionText += currentValue[i].text;
-      regionText += currentValue[i].userValue;
-    }
-    if (cvox.DomUtil.collapseWhitespace(regionText) == '') {
-      cvox.LiveRegionsDeprecated.previousRegionValue[regionIndex] = currentValue;
-      return false;
-    }
-  }
-
-  // Create maps of values in the live region for fast hash lookup.
-  var previousValueMap = {};
-  for (var i = 0; i < previousValue.length; i++) {
-    previousValueMap[previousValue[i].toString()] = true;
-  }
-  var currentValueMap = {};
-  for (i = 0; i < currentValue.length; i++) {
-    currentValueMap[currentValue[i].toString()] = true;
-  }
-
-  // Figure out the additions and removals.
-  var additions = [];
-  if (cvox.AriaUtil.getAriaRelevant(region, 'additions')) {
-    for (i = 0; i < currentValue.length; i++) {
-      if (!previousValueMap[currentValue[i].toString()]) {
-        additions.push(currentValue[i]);
-      }
-    }
-  }
-  var removals = [];
-  if (cvox.AriaUtil.getAriaRelevant(region, 'removals')) {
-    for (i = 0; i < previousValue.length; i++) {
-      if (!currentValueMap[previousValue[i].toString()]) {
-        removals.push(previousValue[i]);
-      }
-    }
-  }
-
-  // Only speak removals if they're the only change. Otherwise, when one or
-  // more removals and additions happen concurrently, treat it as a change
-  // and just speak any additions (which includes changed nodes).
-  var messages = [];
-  if (additions.length == 0 && removals.length > 0) {
-    messages = [new cvox.NavDescription({
-      context: cvox.ChromeVox.msgs.getMsg('live_regions_removed'), text: ''
-    })].concat(removals);
-  } else {
-    messages = additions;
-  }
-
-  // Store the new value of the live region.
-  cvox.LiveRegionsDeprecated.previousRegionValue[regionIndex] = currentValue;
-
-  // Return if speak is disabled or there's nothing to announce.
-  if (disableSpeak || messages.length == 0) {
-    return false;
-  }
-
-  // Announce the changes with the appropriate politeness level.
-  var live = cvox.AriaUtil.getAriaLive(region);
-  if (live == 'polite') {
-    queueMode = cvox.AbstractTts.QUEUE_MODE_QUEUE;
-  }
-  for (i = 0; i < messages.length; i++) {
-    messages[i].speak(queueMode);
-    queueMode = cvox.AbstractTts.QUEUE_MODE_QUEUE;
-  }
-
-  return true;
-};
-
-/**
- * Recursively build up the value of a live region and return it as
- * an array of NavDescriptions. Each atomic portion of the region gets a
- * single string, otherwise each leaf node gets its own string. When a region
- * changes, the sets of strings before and after are searched to determine
- * which have changed.
- *
- * @param {Node} node The root node.
- * @return {Array.<cvox.NavDescription>} An array of NavDescriptions
- *     describing atomic nodes or leaf nodes in the subtree rooted
- *     at this node.
- */
-cvox.LiveRegionsDeprecated.buildCurrentLiveRegionValue = function(node) {
-  if (cvox.AriaUtil.getAriaAtomic(node) ||
-      cvox.DomUtil.isLeafNode(node)) {
-    var description = cvox.DescriptionUtil.getDescriptionFromAncestors(
-        [node], true, cvox.ChromeVox.verbosity);
-    if (!description.isEmpty()) {
-      return [description];
-    } else {
-      return [];
-    }
-  }
-
-  var result = [];
-
-  // Start with the description of this node.
-  var description = cvox.DescriptionUtil.getDescriptionFromAncestors(
-      [node], false, cvox.ChromeVox.verbosity);
-  if (!description.isEmpty()) {
-    result.push(description);
-  }
-
-  // Recursively add descriptions of child nodes.
-  for (var i = 0; i < node.childNodes.length; i++) {
-    var child = node.childNodes[i];
-    if (cvox.DomUtil.isVisible(child, {checkAncestors: false}) &&
-        !cvox.AriaUtil.isHidden(child)) {
-      var recursiveArray = cvox.LiveRegionsDeprecated.buildCurrentLiveRegionValue(child);
-      result = result.concat(recursiveArray);
-    }
-  }
-  return result;
-};