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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* noVNC: HTML5 VNC client
* Copyright (C) 2018 The noVNC Authors
* Licensed under MPL 2.0 (see LICENSE.txt)
*
* See README.md for usage and integration instructions.
*/
/*
* Localization Utilities
*/
export class Localizer {
constructor() {
// Currently configured language
this.language = 'en';
// Current dictionary of translations
this._dictionary = undefined;
}
// Configure suitable language based on user preferences
async setup(supportedLanguages, baseURL) {
this.language = 'en'; // Default: US English
this._dictionary = undefined;
this._setupLanguage(supportedLanguages);
await this._setupDictionary(baseURL);
}
_setupLanguage(supportedLanguages) {
/*
* Navigator.languages only available in Chrome (32+) and FireFox (32+)
* Fall back to navigator.language for other browsers
*/
let userLanguages;
if (typeof window.navigator.languages == 'object') {
userLanguages = window.navigator.languages;
} else {
userLanguages = [navigator.language || navigator.userLanguage];
}
for (let i = 0;i < userLanguages.length;i++) {
const userLang = userLanguages[i]
.toLowerCase()
.replace("_", "-")
.split("-");
// First pass: perfect match
for (let j = 0; j < supportedLanguages.length; j++) {
const supLang = supportedLanguages[j]
.toLowerCase()
.replace("_", "-")
.split("-");
if (userLang[0] !== supLang[0]) {
continue;
}
if (userLang[1] !== supLang[1]) {
continue;
}
this.language = supportedLanguages[j];
return;
}
// Second pass: English fallback
if (userLang[0] === 'en') {
return;
}
// Third pass pass: other fallback
for (let j = 0;j < supportedLanguages.length;j++) {
const supLang = supportedLanguages[j]
.toLowerCase()
.replace("_", "-")
.split("-");
if (userLang[0] !== supLang[0]) {
continue;
}
if (supLang[1] !== undefined) {
continue;
}
this.language = supportedLanguages[j];
return;
}
}
}
async _setupDictionary(baseURL) {
if (baseURL) {
if (!baseURL.endsWith("/")) {
baseURL = baseURL + "/";
}
} else {
baseURL = "";
}
if (this.language === "en") {
return;
}
let response = await fetch(baseURL + this.language + ".json");
if (!response.ok) {
throw Error("" + response.status + " " + response.statusText);
}
this._dictionary = await response.json();
}
// Retrieve localised text
get(id) {
if (typeof this._dictionary !== 'undefined' &&
this._dictionary[id]) {
return this._dictionary[id];
} else {
return id;
}
}
// Traverses the DOM and translates relevant fields
// See https://html.spec.whatwg.org/multipage/dom.html#attr-translate
translateDOM() {
const self = this;
function process(elem, enabled) {
function isAnyOf(searchElement, items) {
return items.indexOf(searchElement) !== -1;
}
function translateString(str) {
// We assume surrounding whitespace, and whitespace around line
// breaks is just for source formatting
str = str.split("\n").map(s => s.trim()).join(" ").trim();
return self.get(str);
}
function translateAttribute(elem, attr) {
const str = translateString(elem.getAttribute(attr));
elem.setAttribute(attr, str);
}
function translateTextNode(node) {
const str = translateString(node.data);
node.data = str;
}
if (elem.hasAttribute("translate")) {
if (isAnyOf(elem.getAttribute("translate"), ["", "yes"])) {
enabled = true;
} else if (isAnyOf(elem.getAttribute("translate"), ["no"])) {
enabled = false;
}
}
if (enabled) {
if (elem.hasAttribute("abbr") &&
elem.tagName === "TH") {
translateAttribute(elem, "abbr");
}
if (elem.hasAttribute("alt") &&
isAnyOf(elem.tagName, ["AREA", "IMG", "INPUT"])) {
translateAttribute(elem, "alt");
}
if (elem.hasAttribute("download") &&
isAnyOf(elem.tagName, ["A", "AREA"])) {
translateAttribute(elem, "download");
}
if (elem.hasAttribute("label") &&
isAnyOf(elem.tagName, ["MENUITEM", "MENU", "OPTGROUP",
"OPTION", "TRACK"])) {
translateAttribute(elem, "label");
}
// FIXME: Should update "lang"
if (elem.hasAttribute("placeholder") &&
isAnyOf(elem.tagName, ["INPUT", "TEXTAREA"])) {
translateAttribute(elem, "placeholder");
}
if (elem.hasAttribute("title")) {
translateAttribute(elem, "title");
}
if (elem.hasAttribute("value") &&
elem.tagName === "INPUT" &&
isAnyOf(elem.getAttribute("type"), ["reset", "button", "submit"])) {
translateAttribute(elem, "value");
}
}
for (let i = 0; i < elem.childNodes.length; i++) {
const node = elem.childNodes[i];
if (node.nodeType === node.ELEMENT_NODE) {
process(node, enabled);
} else if (node.nodeType === node.TEXT_NODE && enabled) {
translateTextNode(node);
}
}
}
process(document.body, true);
}
}
export const l10n = new Localizer();
export default l10n.get.bind(l10n);
|
