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// 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 the current braille translators.
*/
goog.provide('cvox.BrailleTranslatorManager');
goog.require('cvox.BrailleTable');
goog.require('cvox.ExpandingBrailleTranslator');
goog.require('cvox.LibLouis');
/**
* @param {cvox.LibLouis=} opt_liblouisForTest Liblouis instance to use
* for testing.
* @constructor
*/
cvox.BrailleTranslatorManager = function(opt_liblouisForTest) {
/**
* @type {!cvox.LibLouis}
* @private
*/
this.liblouis_ = opt_liblouisForTest || new cvox.LibLouis(
chrome.extension.getURL('braille/liblouis_nacl.nmf'),
chrome.extension.getURL('braille/tables'));
/**
* @type {!Array<function()>}
* @private
*/
this.changeListeners_ = [];
/**
* @type {!Array<cvox.BrailleTable.Table>}
* @private
*/
this.tables_ = [];
/**
* @type {cvox.ExpandingBrailleTranslator}
* @private
*/
this.expandingTranslator_ = null;
/**
* @type {cvox.LibLouis.Translator}
* @private
*/
this.defaultTranslator_ = null;
/**
* @type {string?}
* @private
*/
this.defaultTableId_ = null;
/**
* @type {cvox.LibLouis.Translator}
* @private
*/
this.uncontractedTranslator_ = null;
/**
* @type {string?}
* @private
*/
this.uncontractedTableId_ = null;
if (!opt_liblouisForTest) {
document.addEventListener('DOMContentLoaded',
this.loadLiblouis_.bind(this),
false);
}
};
cvox.BrailleTranslatorManager.prototype = {
/**
* Adds a listener to be called whenever there is a change in the
* translator(s) returned by other methods of this instance.
* @param {function()} listener The listener.
*/
addChangeListener: function(listener) {
this.changeListeners_.push(listener);
},
/**
* Refreshes the braille translator(s) used for input and output. This
* should be called when something has changed (such as a preference) to
* make sure that the correct translator is used.
*/
refresh: function() {
var tables = this.tables_;
if (tables.length == 0)
return;
// First, see if we have a braille table set previously.
var table = cvox.BrailleTable.forId(tables, localStorage['brailleTable']);
if (!table) {
// Match table against current locale.
var currentLocale = chrome.i18n.getMessage('@@ui_locale').split(/[_-]/);
var major = currentLocale[0];
var minor = currentLocale[1];
var firstPass = tables.filter(function(table) {
return table.locale.split(/[_-]/)[0] == major;
});
if (firstPass.length > 0) {
table = firstPass[0];
if (minor) {
var secondPass = firstPass.filter(function(table) {
return table.locale.split(/[_-]/)[1] == minor;
});
if (secondPass.length > 0)
table = secondPass[0];
}
}
}
if (!table)
table = cvox.BrailleTable.forId(tables, 'en-US-comp8');
// TODO(plundblad): Only update when user explicitly selects a table
// so that switching locales changes table by default. crbug.com/441206.
localStorage['brailleTable'] = table.id;
if (!localStorage['brailleTable6'])
localStorage['brailleTable6'] = 'en-US-g1';
if (!localStorage['brailleTable8'])
localStorage['brailleTable8'] = 'en-US-comp8';
if (table.dots == '6') {
localStorage['brailleTableType'] = 'brailleTable6';
localStorage['brailleTable6'] = table.id;
} else {
localStorage['brailleTableType'] = 'brailleTable8';
localStorage['brailleTable8'] = table.id;
}
// If the user explicitly set an 8 dot table, use that when looking
// for an uncontracted table. Otherwise, use the current table and let
// getUncontracted find an appropriate corresponding table.
var table8Dot = cvox.BrailleTable.forId(tables,
localStorage['brailleTable8']);
var uncontractedTable = cvox.BrailleTable.getUncontracted(
tables, table8Dot || table);
var newDefaultTableId = table.id;
var newUncontractedTableId = table.id === uncontractedTable.id ?
null : uncontractedTable.id;
if (newDefaultTableId === this.defaultTableId_ &&
newUncontractedTableId === this.uncontractedTableId_) {
return;
}
var finishRefresh = function(defaultTranslator, uncontractedTranslator) {
this.defaultTableId_ = newDefaultTableId;
this.uncontractedTableId_ = newUncontractedTableId;
this.expandingTranslator_ = new cvox.ExpandingBrailleTranslator(
defaultTranslator, uncontractedTranslator);
this.defaultTranslator_ = defaultTranslator;
this.uncontractedTranslator_ = uncontractedTranslator;
this.changeListeners_.forEach(function(listener) { listener(); });
}.bind(this);
this.liblouis_.getTranslator(table.fileNames, function(translator) {
if (!newUncontractedTableId) {
finishRefresh(translator, null);
} else {
this.liblouis_.getTranslator(
uncontractedTable.fileNames,
function(uncontractedTranslator) {
finishRefresh(translator, uncontractedTranslator);
});
}
}.bind(this));
},
/**
* @return {cvox.ExpandingBrailleTranslator} The current expanding braille
* translator, or {@code null} if none is available.
*/
getExpandingTranslator: function() {
return this.expandingTranslator_;
},
/**
* @return {cvox.LibLouis.Translator} The current braille translator to use
* by default, or {@code null} if none is available.
*/
getDefaultTranslator: function() {
return this.defaultTranslator_;
},
/**
* @return {cvox.LibLouis.Translator} The current uncontracted braille
* translator, or {@code null} if it is the same as the default
* translator.
*/
getUncontractedTranslator: function() {
return this.uncontractedTranslator_;
},
/**
* Asynchronously fetches the list of braille tables and refreshes the
* translators when done.
* @private
*/
fetchTables_: function() {
cvox.BrailleTable.getAll(function(tables) {
this.tables_ = tables;
this.refresh();
}.bind(this));
},
/**
* Loads the liblouis instance by attaching it to the document.
* @private
*/
loadLiblouis_: function() {
// Cast away nullability. When the document is loaded, it will always
// have a body.
this.liblouis_.attachToElement(
/** @type {!HTMLBodyElement} */ (document.body));
this.fetchTables_();
},
/**
* @return {!cvox.LibLouis} The liblouis instance used by this object.
*/
getLibLouisForTest: function() {
return this.liblouis_;
},
/**
* @return {!Array<cvox.BrailleTable.Table>} The currently loaded braille
* tables, or an empty array if they are not yet loaded.
*/
getTablesForTest: function() {
return this.tables_;
}
};
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