95 lines
2.3 KiB
JavaScript
95 lines
2.3 KiB
JavaScript
'use strict';
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const template = {};
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tDocLoader();
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function t(key, params) {
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const s = chrome.i18n.getMessage(key, params);
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if (s == '') {
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throw `Missing string "${key}"`;
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}
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return s;
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}
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function tE(id, key, attr, esc) {
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if (attr) {
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document.getElementById(id).setAttribute(attr, t(key));
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} else if (typeof esc == 'undefined' || esc) {
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document.getElementById(id).appendChild(document.createTextNode(t(key)));
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} else {
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document.getElementById(id).innerHTML = t(key);
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}
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}
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function tHTML(html) {
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const node = document.createElement('div');
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node.innerHTML = html.replace(/>\s+</g, '><'); // spaces are removed; use for an explicit space
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if (html.includes('i18n-')) {
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tNodeList(node.querySelectorAll('*'));
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}
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return node.firstElementChild;
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}
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function tNodeList(nodes) {
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for (const node of [...nodes]) {
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// skip non-ELEMENT_NODE
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if (node.nodeType != 1) {
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continue;
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}
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if (node.localName == 'template') {
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// compress inter-tag whitespace to reduce number of DOM nodes by 25%
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template[node.dataset.id] = tHTML(node.innerHTML);
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continue;
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}
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for (const attr of [...node.attributes]) {
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let name = attr.nodeName;
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if (name.indexOf('i18n-') != 0) {
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continue;
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}
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name = name.substr(5); // 'i18n-'.length
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const value = t(attr.value);
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switch (name) {
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case 'text':
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node.insertBefore(document.createTextNode(value), node.firstChild);
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break;
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case 'html':
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node.insertAdjacentHTML('afterbegin', value);
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break;
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default:
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node.setAttribute(name, value);
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}
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node.removeAttribute(attr.nodeName);
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}
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}
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}
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function tDocLoader() {
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// localize HEAD
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tNodeList(document.all);
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// localize BODY
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const observer = new MutationObserver(mutations => {
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for (const mutation of mutations) {
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tNodeList(mutation.addedNodes);
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}
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});
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const onLoad = () => {
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tDocLoader.stop();
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tNodeList(document.all);
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};
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tDocLoader.start = () => {
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observer.observe(document, {subtree: true, childList: true});
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};
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tDocLoader.stop = () => {
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observer.disconnect();
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document.removeEventListener('DOMContentLoaded', onLoad);
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};
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tDocLoader.start();
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document.addEventListener('DOMContentLoaded', onLoad);
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}
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