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