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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/**
* An API which allows Marionette to handle localized content.
*
* The localization (https://mzl.la/2eUMjyF) of UI elements in Gecko based
* applications is done via entities and properties. For static values entities
* are used, which are located in .dtd files. Whereby for dynamically updated
* content the values come from .property files. Both types of elements can be
* identifed via a unique id, and the translated content retrieved.
*/
const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyServiceGetter(
this, "domParser", "@mozilla.org/xmlextras/domparser;1", "nsIDOMParser");
Cu.import("chrome://marionette/content/error.js");
this.EXPORTED_SYMBOLS = ["l10n"];
this.l10n = {};
/**
* Retrieve the localized string for the specified entity id.
*
* Example:
* localizeEntity(["chrome://global/locale/about.dtd"], "about.version")
*
* @param {Array.<string>} urls
* Array of .dtd URLs.
* @param {string} id
* The ID of the entity to retrieve the localized string for.
*
* @return {string}
* The localized string for the requested entity.
*/
l10n.localizeEntity = function (urls, id) {
// Build a string which contains all possible entity locations
let locations = [];
urls.forEach((url, index) => {
locations.push(`<!ENTITY % dtd_${index} SYSTEM "${url}">%dtd_${index};`);
})
// Use the DOM parser to resolve the entity and extract its real value
let header = `<?xml version="1.0"?><!DOCTYPE elem [${locations.join("")}]>`;
let elem = `<elem id="elementID">&${id};</elem>`;
let doc = domParser.parseFromString(header + elem, "text/xml");
let element = doc.querySelector("elem[id='elementID']");
if (element === null) {
throw new NoSuchElementError(`Entity with id='${id}' hasn't been found`);
}
return element.textContent;
};
/**
* Retrieve the localized string for the specified property id.
*
* Example:
* localizeProperty(["chrome://global/locale/findbar.properties"], "FastFind")
*
* @param {Array.<string>} urls
* Array of .properties URLs.
* @param {string} id
* The ID of the property to retrieve the localized string for.
*
* @return {string}
* The localized string for the requested property.
*/
l10n.localizeProperty = function (urls, id) {
let property = null;
for (let url of urls) {
let bundle = Services.strings.createBundle(url);
try {
property = bundle.GetStringFromName(id);
break;
} catch (e) {}
};
if (property === null) {
throw new NoSuchElementError(`Property with id='${id}' hasn't been found`);
}
return property;
};
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