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103 lines
3.9 KiB
JavaScript
103 lines
3.9 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = [ "TranslationContentHandler" ];
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const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "LanguageDetector",
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"resource:///modules/translation/LanguageDetector.jsm");
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this.TranslationContentHandler = function(global, docShell) {
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let webProgress = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIWebProgress);
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webProgress.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_STATE_DOCUMENT);
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global.addMessageListener("Translation:TranslateDocument", this);
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global.addMessageListener("Translation:ShowTranslation", this);
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global.addMessageListener("Translation:ShowOriginal", this);
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this.global = global;
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}
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TranslationContentHandler.prototype = {
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/* nsIWebProgressListener implementation */
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onStateChange: function(aWebProgress, aRequest, aStateFlags, aStatus) {
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if (!aWebProgress.isTopLevel ||
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!(aStateFlags & Ci.nsIWebProgressListener.STATE_STOP) ||
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!this.global.content)
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return;
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let url = aRequest.name;
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if (!url.startsWith("http://") && !url.startsWith("https://"))
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return;
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// Grab a 60k sample of text from the page.
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let encoder = Cc["@mozilla.org/layout/documentEncoder;1?type=text/plain"]
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.createInstance(Ci.nsIDocumentEncoder);
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encoder.init(this.global.content.document, "text/plain", encoder.SkipInvisibleContent);
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let string = encoder.encodeToStringWithMaxLength(60 * 1024);
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// Language detection isn't reliable on very short strings.
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if (string.length < 100)
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return;
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LanguageDetector.detectLanguage(string).then(result => {
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if (result.confident)
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this.global.sendAsyncMessage("LanguageDetection:Result", result.language);
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});
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},
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// Unused methods.
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onProgressChange: function() {},
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onLocationChange: function() {},
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onStatusChange: function() {},
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onSecurityChange: function() {},
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
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Ci.nsISupportsWeakReference]),
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receiveMessage: function(msg) {
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switch (msg.name) {
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case "Translation:TranslateDocument":
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{
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Cu.import("resource:///modules/translation/TranslationDocument.jsm");
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Cu.import("resource:///modules/translation/BingTranslator.jsm");
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// If a TranslationDocument already exists for this document, it should
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// be used instead of creating a new one so that we can use the original
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// content of the page for the new translation instead of the newly
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// translated text.
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let translationDocument = this.global.content.translationDocument ||
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new TranslationDocument(this.global.content.document);
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let bingTranslation = new BingTranslation(translationDocument,
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msg.data.from,
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msg.data.to);
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this.global.content.translationDocument = translationDocument;
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bingTranslation.translate().then(
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success => {
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this.global.sendAsyncMessage("Translation:Finished", {success: true});
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translationDocument.showTranslation();
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},
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error => {
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this.global.sendAsyncMessage("Translation:Finished", {success: false});
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}
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);
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break;
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}
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case "Translation:ShowOriginal":
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this.global.content.translationDocument.showOriginal();
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break;
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case "Translation:ShowTranslation":
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this.global.content.translationDocument.showTranslation();
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break;
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}
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}
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};
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