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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";
this.EXPORTED_SYMBOLS = [ "TranslationContentHandler" ];
const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "LanguageDetector",
"resource:///modules/translation/LanguageDetector.jsm");
const STATE_OFFER = 0;
const STATE_TRANSLATED = 2;
const STATE_ERROR = 3;
this.TranslationContentHandler = function(global, docShell) {
let webProgress = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebProgress);
webProgress.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_STATE_DOCUMENT);
global.addEventListener("pageshow", this);
global.addMessageListener("Translation:TranslateDocument", this);
global.addMessageListener("Translation:ShowTranslation", this);
global.addMessageListener("Translation:ShowOriginal", this);
this.global = global;
}
TranslationContentHandler.prototype = {
handleEvent(aEvent) {
// We are only listening to pageshow events.
let target = aEvent.target;
// Only handle top-level frames.
let win = target.defaultView;
if (win.parent !== win)
return;
let content = this.global.content;
if (!content.detectedLanguage)
return;
let data = {};
let trDoc = content.translationDocument;
if (trDoc) {
data.state = trDoc.translationError ? STATE_ERROR : STATE_TRANSLATED;
data.translatedFrom = trDoc.translatedFrom;
data.translatedTo = trDoc.translatedTo;
data.originalShown = trDoc.originalShown;
} else {
data.state = STATE_OFFER;
data.originalShown = true;
}
data.detectedLanguage = content.detectedLanguage;
this.global.sendAsyncMessage("Translation:DocumentState", data);
},
/* nsIWebProgressListener implementation */
onStateChange(aWebProgress, aRequest, aStateFlags, aStatus) {
if (!aWebProgress.isTopLevel ||
!(aStateFlags & Ci.nsIWebProgressListener.STATE_STOP) ||
!this.global.content)
return;
let url = aRequest.name;
if (!url.startsWith("http://") && !url.startsWith("https://"))
return;
let content = this.global.content;
if (content.detectedLanguage)
return;
// Grab a 60k sample of text from the page.
let encoder = Cc["@mozilla.org/layout/documentEncoder;1?type=text/plain"]
.createInstance(Ci.nsIDocumentEncoder);
encoder.init(content.document, "text/plain", encoder.SkipInvisibleContent);
let string = encoder.encodeToStringWithMaxLength(60 * 1024);
// Language detection isn't reliable on very short strings.
if (string.length < 100)
return;
LanguageDetector.detectLanguage(string).then(result => {
// Bail if we're not confident.
if (!result.confident) {
return;
}
// The window might be gone by now.
if (Cu.isDeadWrapper(content)) {
return;
}
content.detectedLanguage = result.language;
let data = {
state: STATE_OFFER,
originalShown: true,
detectedLanguage: result.language
};
this.global.sendAsyncMessage("Translation:DocumentState", data);
});
},
// Unused methods.
onProgressChange() {},
onLocationChange() {},
onStatusChange() {},
onSecurityChange() {},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
Ci.nsISupportsWeakReference]),
receiveMessage(msg) {
switch (msg.name) {
case "Translation:TranslateDocument":
{
Cu.import("resource:///modules/translation/TranslationDocument.jsm");
// If a TranslationDocument already exists for this document, it should
// be used instead of creating a new one so that we can use the original
// content of the page for the new translation instead of the newly
// translated text.
let translationDocument = this.global.content.translationDocument ||
new TranslationDocument(this.global.content.document);
let preferredEngine = Services.prefs.getCharPref("browser.translation.engine");
let translator = null;
if (preferredEngine == "yandex") {
Cu.import("resource:///modules/translation/YandexTranslator.jsm");
translator = new YandexTranslator(translationDocument,
msg.data.from,
msg.data.to);
} else {
Cu.import("resource:///modules/translation/BingTranslator.jsm");
translator = new BingTranslator(translationDocument,
msg.data.from,
msg.data.to);
}
this.global.content.translationDocument = translationDocument;
translationDocument.translatedFrom = msg.data.from;
translationDocument.translatedTo = msg.data.to;
translationDocument.translationError = false;
translator.translate().then(
result => {
this.global.sendAsyncMessage("Translation:Finished", {
characterCount: result.characterCount,
from: msg.data.from,
to: msg.data.to,
success: true
});
translationDocument.showTranslation();
},
error => {
translationDocument.translationError = true;
let data = {success: false};
if (error == "unavailable")
data.unavailable = true;
this.global.sendAsyncMessage("Translation:Finished", data);
}
);
break;
}
case "Translation:ShowOriginal":
this.global.content.translationDocument.showOriginal();
break;
case "Translation:ShowTranslation":
this.global.content.translationDocument.showTranslation();
break;
}
}
};
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