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58 lines
1.4 KiB
TypeScript
58 lines
1.4 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { EventImpl } from "./event.ts";
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import { EventTargetImpl } from "./event_target.ts";
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export const add = Symbol("add");
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export const signalAbort = Symbol("signalAbort");
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export const remove = Symbol("remove");
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export class AbortSignalImpl extends EventTargetImpl implements AbortSignal {
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#aborted?: boolean;
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#abortAlgorithms = new Set<() => void>();
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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onabort: ((this: AbortSignal, ev: Event) => any) | null = null;
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[add](algorithm: () => void): void {
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this.#abortAlgorithms.add(algorithm);
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}
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[signalAbort](): void {
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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 EventImpl("abort"));
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}
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[remove](algorithm: () => void): void {
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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.addEventListener("abort", (evt: Event) => {
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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(): boolean {
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return Boolean(this.#aborted);
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}
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get [Symbol.toStringTag](): string {
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return "AbortSignal";
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}
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}
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Object.defineProperty(AbortSignalImpl, "name", {
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value: "AbortSignal",
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configurable: true,
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});
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