noway.gabb.fr
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1import { raf } from './environment.js';
2
3const tasks = new Set();
4
5/**
6 * @param {number} now
7 * @returns {void}
8 */
9function run_tasks(now) {
10 tasks.forEach((task) => {
11 if (!task.c(now)) {
12 tasks.delete(task);
13 task.f();
14 }
15 });
16 if (tasks.size !== 0) raf(run_tasks);
17}
18
19/**
20 * For testing purposes only!
21 * @returns {void}
22 */
23export function clear_loops() {
24 tasks.clear();
25}
26
27/**
28 * Creates a new task that runs on each raf frame
29 * until it returns a falsy value or is aborted
30 * @param {import('./private.js').TaskCallback} callback
31 * @returns {import('./private.js').Task}
32 */
33export function loop(callback) {
34 /** @type {import('./private.js').TaskEntry} */
35 let task;
36 if (tasks.size === 0) raf(run_tasks);
37 return {
38 promise: new Promise((fulfill) => {
39 tasks.add((task = { c: callback, f: fulfill }));
40 }),
41 abort() {
42 tasks.delete(task);
43 }
44 };
45}