73 lines
3.5 KiB
JavaScript
73 lines
3.5 KiB
JavaScript
/* Build-local classic-script loader. The inert manifest precedes this head script. */
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(function (root) {
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'use strict';
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const doc = root.document;
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let manifest;
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try { manifest = JSON.parse(doc.getElementById('ytp-assets').textContent); }
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catch { return; } // Native/static shells retain their eager script path.
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const assets = new Map(), groups = new Map(), hooks = new Map();
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const css = new Set([...doc.querySelectorAll('link[data-lazy-css]')].map(link => link.dataset.lazyCss));
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const url = path => manifest.files[path]?.h ? path + '?v=' + manifest.files[path].h : path;
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function inject(path) {
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if (assets.has(path)) return assets.get(path);
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const style = /\.css$/.test(path);
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if (style && css.has(path)) return Promise.resolve();
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if (!style && !/\.js$/.test(path)) return Promise.resolve(); // workers/imports/fonts are not page scripts
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const task = new Promise((resolve, reject) => {
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const node = doc.createElement(style ? 'link' : 'script');
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if (style) { node.rel = 'stylesheet'; node.href = url(path); }
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else { node.async = false; node.src = url(path); }
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node.onload = resolve;
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node.onerror = () => reject(new Error('Unable to load ' + path));
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doc.head.append(node);
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});
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assets.set(path, task);
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task.catch(() => assets.delete(path));
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return task;
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}
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function load(name) {
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if (groups.has(name)) return groups.get(name);
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const group = manifest.groups[name];
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if (!group) return Promise.reject(new Error('Unknown asset group: ' + name));
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const task = (async () => {
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for (const dependency of group.dependencies || []) await load(dependency);
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for (const path of group.files) if (!/-worker\.js$/.test(path)) await inject(path);
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for (const fn of hooks.get(name) || []) await fn();
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group.executed = true;
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})();
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groups.set(name, task);
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task.catch(error => {
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groups.delete(name);
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root.dispatchEvent?.(new root.CustomEvent('ytp-lazy-error', { detail: { group: name, error } }));
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});
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return task;
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}
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const api = {
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load, prefetch: load, loaded: name => !!manifest.groups[name]?.executed, url,
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manifest, layout: 'classic',
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onLoad(name, fn) { const list = hooks.get(name) || []; list.push(fn); hooks.set(name, list); },
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proxy(name, methods, globalName) {
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return Object.fromEntries(methods.map(method => [method, async (...args) => {
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await load(name);
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const target = root[globalName || name.split(':')[1]];
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if (typeof target?.[method] !== 'function') throw new Error('Missing lazy method: ' + method);
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return target[method](...args);
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}]));
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},
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intent(element, name) {
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if (!element) return;
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for (const type of ['pointerenter', 'focus', 'touchstart']) element.addEventListener(type, () => load(name).catch(() => {}), { once: true, passive: true });
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},
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};
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root.Lazy = api;
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try { api.layout = JSON.parse(root.localStorage.getItem('_ytpdata') || '{}').settings?.layout || 'classic'; } catch {}
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doc.documentElement.dataset.layout = api.layout;
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const layout = manifest.groups['layout:' + api.layout] || manifest.groups['layout:classic'];
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if (doc.readyState === 'loading') for (const path of layout?.files || []) {
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if (!/\.css$/.test(path) || css.has(path)) continue;
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// Parser-inserted CSS blocks rendering; dynamic head links do not on all WebKit versions.
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css.add(path);
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doc.write('<link rel="stylesheet" href="' + url(path) + '" data-lazy-css="' + path + '">');
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}
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})(typeof window !== 'undefined' ? window : globalThis);
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