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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 Holds information about a braille table.
*/
goog.provide('cvox.BrailleTable');
/**
* @typedef {{
* locale:string,
* dots:string,
* id:string,
* grade:(string|undefined),
* variant:(string|undefined),
* fileNames:string
* }}
*/
cvox.BrailleTable.Table;
/**
* @const {string}
*/
cvox.BrailleTable.TABLE_PATH = 'braille/tables.json';
/**
* @const {string}
* @private
*/
cvox.BrailleTable.COMMON_DEFS_FILENAME_ = 'cvox-common.cti';
/**
* Retrieves a list of all available braille tables.
* @param {function(!Array<cvox.BrailleTable.Table>)} callback
* Called asynchronously with an array of tables.
*/
cvox.BrailleTable.getAll = function(callback) {
function appendCommonFilename(tables) {
// Append the common definitions to all table filenames.
tables.forEach(function(table) {
table.fileNames += (',' + cvox.BrailleTable.COMMON_DEFS_FILENAME_);
});
return tables;
}
var url = chrome.extension.getURL(cvox.BrailleTable.TABLE_PATH);
if (!url) {
throw 'Invalid path: ' + cvox.BrailleTable.TABLE_PATH;
}
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
if (xhr.status == 200) {
callback(
appendCommonFilename(
/** @type {!Array<cvox.BrailleTable.Table>} */ (
JSON.parse(xhr.responseText))));
}
}
};
xhr.send();
};
/**
* Finds a table in a list of tables by id.
* @param {!Array<cvox.BrailleTable.Table>} tables tables to search in.
* @param {string} id id of table to find.
* @return {cvox.BrailleTable.Table} The found table, or null if not found.
*/
cvox.BrailleTable.forId = function(tables, id) {
return tables.filter(function(table) { return table.id === id })[0] || null;
};
/**
* Returns an uncontracted braille table corresponding to another, possibly
* contracted, table. If {@code table} is the lowest-grade table for its
* locale and dot count, {@code table} itself is returned.
* @param {!Array<cvox.BrailleTable.Table>} tables tables to search in.
* @param {!cvox.BrailleTable.Table} table Table to match.
* @return {!cvox.BrailleTable.Table} Corresponding uncontracted table,
* or {@code table} if it is uncontracted.
*/
cvox.BrailleTable.getUncontracted = function(tables, table) {
function mostUncontractedOf(current, candidate) {
// An 8 dot table for the same language is prefered over a 6 dot table
// even if the locales differ by region.
if (current.dots === '6' &&
candidate.dots === '8' &&
current.locale.lastIndexOf(candidate.locale, 0) == 0) {
return candidate;
}
if (current.locale === candidate.locale &&
current.dots === candidate.dots &&
goog.isDef(current.grade) &&
goog.isDef(candidate.grade) &&
candidate.grade < current.grade) {
return candidate;
}
return current;
}
return tables.reduce(mostUncontractedOf, table);
};
/**
* @param {!cvox.BrailleTable.Table} table Table to get name for.
* @return {string} Localized display name.
*/
cvox.BrailleTable.getDisplayName = function(table) {
var localeName = Msgs.getLocaleDisplayName(table.locale);
if (!table.grade && !table.variant) {
return localeName;
} else if (table.grade && !table.variant) {
return Msgs.getMsg('braille_table_name_with_grade',
[localeName, table.grade]);
} else if (!table.grade && table.variant) {
return Msgs.getMsg('braille_table_name_with_variant',
[localeName, table.variant]);
} else {
return Msgs.getMsg('braille_table_name_with_variant_and_grade',
[localeName, table.variant, table.grade]);
}
};
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