Bilibili-Evolved/utils/i18n/i18n.js
2019-04-08 23:06:34 +08:00

139 lines
4.9 KiB
JavaScript

const languageCodeMap = {
"日本語": "ja-JP",
"English": "en-US",
"Deutsch": "de-DE",
};
export class Translator {
accepts(node) { return node.nodeType === Node.ELEMENT_NODE; }
getValue(node) { return node.nodeValue; }
setValue(node, value) { node.nodeValue = value; }
getElement(node) { return node; }
translate(node) {
const value = this.getValue(node);
if (!value || typeof value !== "string" || value === "*") {
return;
}
const translation = Translator.map.get(value.trim());
if (translation === undefined) {
const result = Translator.regex.find(([r]) => r.test(value));
if (result) {
const [regex, replacement] = result;
this.setValue(node, value.replace(regex, replacement));
}
}
else if (typeof translation === "string") {
this.setValue(node, translation);
}
else if (Array.isArray(translation)) {
let finalTranslation = null;
for (const subTranslation of translation) {
if (typeof subTranslation === "string") {
finalTranslation = subTranslation;
}
else {
const { text, selector, not } = subTranslation;
if (this.getElement(node).matches(selector) !== Boolean(not)) {
finalTranslation = text;
}
}
}
if (finalTranslation !== null) {
this.setValue(node, finalTranslation);
}
}
else {
const { text, selector, not } = translation;
if (this.getElement(node).matches(selector) !== Boolean(not)) {
this.setValue(node, text);
}
}
}
// https://stackoverflow.com/questions/10730309/find-all-text-nodes-in-html-page
static walk(rootElement, action) {
const walker = document.createTreeWalker(rootElement, NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT, null, false);
let node = walker.nextNode();
while (node) {
action(node);
node = walker.nextNode();
}
}
static translate(rootElement) {
if (rootElement.nodeType === Node.TEXT_NODE) {
Translator.textNode.translate(rootElement);
return;
}
Translator.walk(rootElement, node => {
for (const translator of Translator.allTranslators) {
if (translator.accepts(node)) {
translator.translate(node);
}
}
});
}
static translateCssMatches() {
const selectors = Translator.map.get("*");
if (!selectors) {
return;
}
for (const { selector, text } of selectors) {
const element = document.querySelector(selector);
if (element) {
[...element.childNodes].filter(it => it.nodeType === Node.TEXT_NODE).forEach(it => it.nodeValue = text);
}
}
}
}
export class TextNodeTranslator extends Translator {
accepts(node) { return node.nodeType === Node.TEXT_NODE; }
getElement(node) {
return node.parentElement;
}
}
export class TitleTranslator extends Translator {
getValue(node) { return node.getAttribute("title"); }
setValue(node, value) {
node.setAttribute("title", value);
}
}
export class PlaceholderTranslator extends Translator {
// accepts(node: Node) { return node.nodeName === "INPUT" && (node as HTMLInputElement).type.toUpperCase() === "TEXT" || node.nodeName === "TEXTAREA"; }
getValue(node) { return node.getAttribute("placeholder"); }
setValue(node, value) {
node.setAttribute("placeholder", value);
}
}
Translator.textNode = new TextNodeTranslator;
Translator.title = new TitleTranslator;
Translator.placeholder = new PlaceholderTranslator;
Translator.allTranslators = [Translator.textNode, Translator.title, Translator.placeholder];
(async () => {
const { map, regex } = await import(`./i18n.${languageCodeMap[settings.i18nLanguage]}`);
Translator.map = map;
Translator.regex = [...regex.entries()];
Translator.translate(document.body);
Translator.translateCssMatches();
Observer.observe("body", records => {
records.forEach(it => {
if (it.type === "childList") {
if (it.addedNodes.length > 0) {
Translator.translateCssMatches();
}
it.addedNodes.forEach(node => {
Translator.translate(node);
});
}
else if (it.type === "characterData") {
Translator.textNode.translate(it.target);
}
});
}, { characterData: true, childList: true, subtree: true });
})();
export default {
export: {
Translator,
TextNodeTranslator,
TitleTranslator,
PlaceholderTranslator,
},
};