lix-website/themes/lix/assets/bootstrap/node_modules/p-cancelable/index.js
2024-04-26 22:49:34 -06:00

89 lines
1.6 KiB
JavaScript

'use strict';
class CancelError extends Error {
constructor() {
super('Promise was canceled');
this.name = 'CancelError';
}
get isCanceled() {
return true;
}
}
class PCancelable {
static fn(userFn) {
return function () {
const args = [].slice.apply(arguments);
return new PCancelable((resolve, reject, onCancel) => {
args.push(onCancel);
userFn.apply(null, args).then(resolve, reject);
});
};
}
constructor(executor) {
this._cancelHandlers = [];
this._isPending = true;
this._isCanceled = false;
this._promise = new Promise((resolve, reject) => {
this._reject = reject;
return executor(
value => {
this._isPending = false;
resolve(value);
},
error => {
this._isPending = false;
reject(error);
},
handler => {
this._cancelHandlers.push(handler);
}
);
});
}
then(onFulfilled, onRejected) {
return this._promise.then(onFulfilled, onRejected);
}
catch(onRejected) {
return this._promise.catch(onRejected);
}
finally(onFinally) {
return this._promise.finally(onFinally);
}
cancel() {
if (!this._isPending || this._isCanceled) {
return;
}
if (this._cancelHandlers.length > 0) {
try {
for (const handler of this._cancelHandlers) {
handler();
}
} catch (err) {
this._reject(err);
}
}
this._isCanceled = true;
this._reject(new CancelError());
}
get isCanceled() {
return this._isCanceled;
}
}
Object.setPrototypeOf(PCancelable.prototype, Promise.prototype);
module.exports = PCancelable;
module.exports.CancelError = CancelError;