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