82 lines
2.7 KiB
JavaScript
82 lines
2.7 KiB
JavaScript
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/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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'use strict';
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Object.defineProperty(exports, "__esModule", { value: true });
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const events_1 = require("./events");
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const Is = require("./is");
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var CancellationToken;
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(function (CancellationToken) {
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CancellationToken.None = Object.freeze({
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isCancellationRequested: false,
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onCancellationRequested: events_1.Event.None
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});
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CancellationToken.Cancelled = Object.freeze({
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isCancellationRequested: true,
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onCancellationRequested: events_1.Event.None
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});
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function is(value) {
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let candidate = value;
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return candidate && (candidate === CancellationToken.None
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|| candidate === CancellationToken.Cancelled
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|| (Is.boolean(candidate.isCancellationRequested) && !!candidate.onCancellationRequested));
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}
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CancellationToken.is = is;
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})(CancellationToken = exports.CancellationToken || (exports.CancellationToken = {}));
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const shortcutEvent = Object.freeze(function (callback, context) {
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let handle = setTimeout(callback.bind(context), 0);
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return { dispose() { clearTimeout(handle); } };
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});
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class MutableToken {
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constructor() {
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this._isCancelled = false;
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}
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cancel() {
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if (!this._isCancelled) {
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this._isCancelled = true;
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if (this._emitter) {
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this._emitter.fire(undefined);
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this._emitter = undefined;
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}
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}
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}
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get isCancellationRequested() {
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return this._isCancelled;
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}
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get onCancellationRequested() {
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if (this._isCancelled) {
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return shortcutEvent;
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}
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if (!this._emitter) {
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this._emitter = new events_1.Emitter();
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}
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return this._emitter.event;
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}
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}
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class CancellationTokenSource {
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get token() {
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if (!this._token) {
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// be lazy and create the token only when
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// actually needed
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this._token = new MutableToken();
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}
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return this._token;
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}
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cancel() {
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if (!this._token) {
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// save an object by returning the default
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// cancelled token when cancellation happens
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// before someone asks for the token
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this._token = CancellationToken.Cancelled;
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}
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else {
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this._token.cancel();
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}
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}
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dispose() {
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this.cancel();
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}
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}
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exports.CancellationTokenSource = CancellationTokenSource;
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