gecko/browser/extensions/pdfjs/content/web/l10n.js

115 lines
3.2 KiB
JavaScript

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
// Small subset of the webL10n API by Fabien Cazenave for pdf.js extension.
(function(window) {
var gLanguage = '';
// fetch an l10n objects
function getL10nData(key) {
var response = FirefoxCom.requestSync('getStrings', key);
var data = JSON.parse(response);
if (!data)
console.warn('[l10n] #' + key + ' missing for [' + gLanguage + ']');
return data;
}
// replace {{arguments}} with their values
function substArguments(text, args) {
if (!args)
return text;
return text.replace(/\{\{\s*(\w+)\s*\}\}/g, function(all, name) {
return name in args ? args[name] : '{{' + name + '}}';
});
}
// translate a string
function translateString(key, args, fallback) {
var data = getL10nData(key);
if (!data && fallback)
data = {textContent: fallback};
if (!data)
return '{{' + key + '}}';
return substArguments(data.textContent, args);
}
// translate an HTML element
function translateElement(element) {
if (!element || !element.dataset)
return;
// get the related l10n object
var data = getL10nData(element.dataset.l10nId);
if (!data)
return;
// get arguments (if any)
// TODO: more flexible parser?
var args;
if (element.dataset.l10nArgs) try {
args = JSON.parse(element.dataset.l10nArgs);
} catch (e) {
console.warn('[l10n] could not parse arguments for #' + key + '');
}
// translate element
// TODO: security check?
for (var k in data)
element[k] = substArguments(data[k], args);
}
// translate an HTML subtree
function translateFragment(element) {
element = element || document.querySelector('html');
// check all translatable children (= w/ a `data-l10n-id' attribute)
var children = element.querySelectorAll('*[data-l10n-id]');
var elementCount = children.length;
for (var i = 0; i < elementCount; i++)
translateElement(children[i]);
// translate element itself if necessary
if (element.dataset.l10nId)
translateElement(element);
}
window.addEventListener('DOMContentLoaded', function() {
gLanguage = FirefoxCom.requestSync('getLocale', null);
translateFragment();
// fire a 'localized' DOM event
var evtObject = document.createEvent('Event');
evtObject.initEvent('localized', false, false);
evtObject.language = gLanguage;
window.dispatchEvent(evtObject);
});
// Public API
document.mozL10n = {
// get a localized string
get: translateString,
// get|set the document language and direction
get language() {
return {
// get|set the document language (ISO-639-1)
get code() { return gLanguage; },
// get the direction (ltr|rtl) of the current language
get direction() {
// http://www.w3.org/International/questions/qa-scripts
// Arabic, Hebrew, Farsi, Pashto, Urdu
var rtlList = ['ar', 'he', 'fa', 'ps', 'ur'];
return (rtlList.indexOf(gLanguage) >= 0) ? 'rtl' : 'ltr';
}
};
}
};
})(this);