1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/* 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: function(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: function(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: function() {},
onLocationChange: function() {},
onStatusChange: function() {},
onSecurityChange: function() {},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
Ci.nsISupportsWeakReference]),
receiveMessage: function(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;
}
}
};
|
