cancel.js
1.36 KB
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"use strict";
module.exports = function(Promise) {
var errors = require("./errors.js");
var async = require("./async.js");
var CancellationError = errors.CancellationError;
Promise.prototype._cancel = function (reason) {
if (!this.isCancellable()) return this;
var parent;
var promiseToReject = this;
while ((parent = promiseToReject._cancellationParent) !== undefined &&
parent.isCancellable()) {
promiseToReject = parent;
}
this._unsetCancellable();
promiseToReject._target()._rejectCallback(reason, false, true);
};
Promise.prototype.cancel = function (reason) {
if (!this.isCancellable()) return this;
if (reason === undefined) reason = new CancellationError();
async.invokeLater(this._cancel, this, reason);
return this;
};
Promise.prototype.cancellable = function () {
if (this._cancellable()) return this;
this._setCancellable();
this._cancellationParent = this._pendingCancellationParent();
return this;
};
Promise.prototype.uncancellable = function () {
var ret = this.then();
ret._unsetCancellable();
return ret;
};
Promise.prototype.fork = function (didFulfill, didReject, didProgress) {
var ret = this._then(didFulfill, didReject, didProgress,
undefined, undefined);
ret._setCancellable();
ret._cancellationParent = undefined;
return ret;
};
};