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https://github.com/denoland/deno.git
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76 lines
1.5 KiB
JavaScript
76 lines
1.5 KiB
JavaScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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((window) => {
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const add = Symbol("add");
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const signalAbort = Symbol("signalAbort");
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const remove = Symbol("remove");
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class AbortSignal extends EventTarget {
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#aborted = false;
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#abortAlgorithms = new Set();
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[add](algorithm) {
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this.#abortAlgorithms.add(algorithm);
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}
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[signalAbort]() {
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if (this.#aborted) {
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return;
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}
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this.#aborted = true;
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for (const algorithm of this.#abortAlgorithms) {
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algorithm();
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}
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this.#abortAlgorithms.clear();
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this.dispatchEvent(new Event("abort"));
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}
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[remove](algorithm) {
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this.#abortAlgorithms.delete(algorithm);
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}
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constructor() {
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super();
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this.onabort = null;
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this.addEventListener("abort", (evt) => {
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const { onabort } = this;
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if (typeof onabort === "function") {
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onabort.call(this, evt);
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}
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});
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}
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get aborted() {
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return Boolean(this.#aborted);
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}
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get [Symbol.toStringTag]() {
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return "AbortSignal";
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}
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}
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class AbortController {
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#signal = new AbortSignal();
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get signal() {
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return this.#signal;
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}
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abort() {
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this.#signal[signalAbort]();
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}
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get [Symbol.toStringTag]() {
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return "AbortController";
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}
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}
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window.AbortSignal = AbortSignal;
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window.AbortController = AbortController;
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window.__bootstrap = window.__bootstrap || {};
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window.__bootstrap.abortSignal = {
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add,
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signalAbort,
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remove,
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};
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})(this);
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