299 lines
9.7 KiB
JavaScript
299 lines
9.7 KiB
JavaScript
const isFn = (v) => typeof v === 'function';
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const isNode = (v) => v instanceof Node;
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let isScheduled = false;
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const queue = new Set();
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const tick = () => {
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queue.forEach(fn => fn());
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queue.clear();
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isScheduled = false;
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}
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let activeEffect = null;
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export const effect = (fn, is_scope = false) => {
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let cleanup = null;
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const run = () => {
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stop();
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const prev = activeEffect;
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activeEffect = run;
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try { cleanup = fn(); } finally { activeEffect = prev; }
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}
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const stop = () => {
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run.e.forEach(subs => subs.delete(run));
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run.e.clear();
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if (isFn(cleanup)) cleanup();
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if (run.c) {
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run.c.forEach(s => s());
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run.c.length = 0;
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}
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}
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run.e = new Set();
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if (is_scope) run.c = [];
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run();
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if (activeEffect?.c) activeEffect.c.push(stop);
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return stop;
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}
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export const scope = f => effect(f, true);
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const track = (subs) => {
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if (activeEffect && !activeEffect.c) {
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subs.add(activeEffect);
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activeEffect.e.add(subs);
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}
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}
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export const signal = (value) => {
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const subs = new Set();
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return {
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_isSig: true,
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get value() { track(subs); return value; },
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set value(newValue) {
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if (newValue === value) return;
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value = newValue;
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subs.forEach(fn => queue.add(fn));
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if (!isScheduled) { isScheduled = true; queueMicrotask(tick); }
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}
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}
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}
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export const untrack = (fn) => {
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const prev = activeEffect;
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activeEffect = null;
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const result = fn();
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activeEffect = prev;
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return result;
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}
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export const computed = (fn) => {
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const sig = signal();
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effect(() => sig.value = fn());
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return { get value() { return sig.value; } };
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}
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const reactiveCache = new WeakMap();
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export const reactive = (obj) => {
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if (reactiveCache.has(obj)) return reactiveCache.get(obj);
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const subs = {};
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const proxy = new Proxy(obj, {
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get(t, key) {
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track(subs[key] ??= new Set());
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const val = t[key];
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return (val && typeof val === 'object') ? reactive(val) : val;
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},
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set(t, key, val) {
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if (t[key] === val) return true;
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t[key] = val;
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if (subs[key]) {
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subs[key].forEach(fn => queue.add(fn));
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if (!isScheduled) { isScheduled = true; queueMicrotask(tick); }
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}
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return true;
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}
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});
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reactiveCache.set(obj, proxy);
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return proxy;
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}
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export const persist = (key, target) => {
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const saved = localStorage.getItem(key);
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if (saved !== null) {
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const data = JSON.parse(saved);
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if (target._isSig) target.value = data;
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else Object.assign(target, data);
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}
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effect(() => {
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const val = target._isSig ? target.value : target;
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localStorage.setItem(key, JSON.stringify(val));
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});
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return target;
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};
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export const storage = (key, val) => persist(key, signal(val));
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export const watch = (source, cb) => {
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let first = true, oldValue;
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return effect(() => {
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const newValue = isFn(source) ? source() : source.value;
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if (!first) untrack(() => cb(newValue, oldValue));
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else first = false;
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oldValue = newValue;
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});
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}
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let context = null;
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export const onMount = (fn) => context?.m.push(fn);
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export const onUnmount = (fn) => context?.u.push(fn);
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export const provide = (key, value) => context && (context.p[key] = value);
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export const inject = (key, dft) => context && (key in context.p ? context.p[key] : dft);
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const remove = async (node) => {
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if (Array.isArray(node)) return Promise.all(node.map(remove));
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if (node.$off) await node.$off(node);
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else if (node.$l) await new Promise(res => node.$l(res));
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node.$s?.();
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if (node.$c) node.$c.u.forEach(f => f());
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node.remove();
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}
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const render = (fn, ...data) => {
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let node;
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const stop = effect(() => {
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node = fn(...data);
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if (isFn(node)) node = node();
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}, true);
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if (node) node.$s = stop;
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return node;
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}
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export const h = (tag, props = {}, ...children) => {
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children = children.flat(Infinity);
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if (isFn(tag)) {
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const prev = context;
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context = { m: [], u: [], p: { ...(prev?.p || {}) } };
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const ctx = context;
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let el;
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const stop = effect(() => {
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el = tag(props, { children, emit: (evt, ...args) => props[`on${evt[0].toUpperCase()}${evt.slice(1)}`]?.(...args) });
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return () => ctx.u.forEach(f => f());
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}, true);
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const out = isNode(el) ? el : document.createTextNode(String(el));
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out.$c = ctx;
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out.$s = stop;
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if (props.on) out.$on = props.on;
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if (props.off) out.$off = props.off;
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context = prev;
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return out;
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}
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if (!tag) return children;
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const isSvg = tag === 'svg' || tag === 'path' || tag === 'circle';
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const el = isSvg ? document.createElementNS("http://www.w3.org/2000/svg", tag) : document.createElement(tag);
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for (const key in props) {
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const val = props[key];
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if (key.startsWith('on') && key !== 'on' && key !== 'off') el.addEventListener(key.slice(2).toLowerCase(), val);
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else if (key === "ref") isFn(val) ? val(el) : val.value = el;
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else if (key === "on") el.$on = val;
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else if (key === "off") el.$off = val;
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else if (isFn(val)) effect(() => el[key] = val());
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else el[key] = val;
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}
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children.forEach(child => append(el, child));
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return el;
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}
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const append = (parent, child) => {
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if (child == null) return;
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if (isFn(child)) {
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const anchor = document.createTextNode('');
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parent.appendChild(anchor);
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let nodes = [];
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effect(async () => {
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const raw = [child()].flat(Infinity).filter(n => n != null);
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const newNodes = raw.map(n => isNode(n) ? n : document.createTextNode(String(n)));
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for (const n of nodes) { if (!newNodes.includes(n)) await remove(n); }
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newNodes.forEach((n, i) => {
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if (!nodes.includes(n)) {
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parent.insertBefore(n, newNodes[i+1] || anchor);
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if (n.$on) n.$on(n);
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if (n.$c) n.$c.m.forEach(f => f());
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}
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});
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nodes = newNodes;
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}, true);
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} else {
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const n = isNode(child) ? child : document.createTextNode(String(child));
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parent.appendChild(n);
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if (n.$on) n.$on(n);
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}
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}
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export const If = (cond, renderFn, fallback = null, transitions = {}) => {
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let cached, current;
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return () => {
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const show = !!cond();
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if (show !== current) {
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const update = async () => {
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if (cached) await remove(cached);
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cached = show ? render(renderFn) : (isFn(fallback) ? render(fallback) : fallback);
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if (isNode(cached)) {
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if (transitions.on) cached.$on = transitions.on;
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if (transitions.off) cached.$off = transitions.off;
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}
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current = show;
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};
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update();
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}
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return cached;
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}
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}
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export const For = (list, key, renderFn) => {
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let cache = new Map();
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return () => {
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const next = new Map();
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const items = isFn(list) ? list() : (list.value || list);
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const res = items.map((item, i) => {
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const id = isFn(key) ? key(item, i) : (key ? item[id] : item);
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let node = cache.get(id);
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if (!node) node = render(renderFn, item, i);
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next.set(id, node);
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return node;
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});
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cache.forEach(async (node, id) => { if (!next.has(id)) await remove(node); });
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cache = next;
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return res;
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}
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}
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export const Router = (routes) => {
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const path = signal(window.location.hash.slice(1) || '/');
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window.onhashchange = () => path.value = window.location.hash.slice(1) || '/';
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return h('div', { class: 'router-view' }, () => {
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const route = routes.find(r => r.path === path.value) || routes.find(r => r.path === '*');
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return route ? h(route.component) : null;
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});
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};
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export const Component = ({ is, ...props }, { children }) => () => h(isFn(is) ? is() : is, props, children);
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export const Transition = ({ enter: e, idle, leave: l }, { children: [c] }) => {
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const decorate = (el) => {
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if (!isNode(el)) return el;
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const addClass = c => c && el.classList.add(...c.split(' '));
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const removeClass = c => c && el.classList.remove(...c.split(' '));
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el.$on = () => {
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if (!e) return;
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requestAnimationFrame(() => {
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addClass(e[1]);
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requestAnimationFrame(() => {
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addClass(e[0]); removeClass(e[1]); addClass(e[2]);
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el.addEventListener('transitionend', () => {
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removeClass(e[2]); removeClass(e[0]); addClass(idle);
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}, { once: true });
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});
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});
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};
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el.$off = (node) => {
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if (!l) return node.remove();
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return new Promise(res => {
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removeClass(idle); addClass(l[1]);
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requestAnimationFrame(() => {
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addClass(l[0]); removeClass(l[1]); addClass(l[2]);
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el.addEventListener('transitionend', () => {
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removeClass(l[2]); removeClass(l[0]); res();
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}, { once: true });
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});
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});
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};
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return el;
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}
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return isFn(c) ? () => decorate(c()) : decorate(c);
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}
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export default (target, root, props) => {
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const el = h(root, props);
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target.appendChild(el);
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if (el.$on) el.$on(el);
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if (el.$c) el.$c.m.forEach(f => f());
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return () => remove(el);
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} |