“use strict”; module.exports = function(Promise, PromiseArray, apiRejection, debug) { var util = require(“./util”); var tryCatch = util.tryCatch; var errorObj = util.errorObj; var async = Promise._async;
Promise.prototype = Promise.prototype.cancel = function() {
if (!debug.cancellation()) return this._warn("cancellation is disabled"); var promise = this; var child = promise; while (promise._isCancellable()) { if (!promise._cancelBy(child)) { if (child._isFollowing()) { child._followee().cancel(); } else { child._cancelBranched(); } break; } var parent = promise._cancellationParent; if (parent == null || !parent._isCancellable()) { if (promise._isFollowing()) { promise._followee().cancel(); } else { promise._cancelBranched(); } break; } else { if (promise._isFollowing()) promise._followee().cancel(); promise._setWillBeCancelled(); child = promise; promise = parent; } }
};
Promise.prototype._branchHasCancelled = function() {
this._branchesRemainingToCancel--;
};
Promise.prototype._enoughBranchesHaveCancelled = function() {
return this._branchesRemainingToCancel === undefined || this._branchesRemainingToCancel <= 0;
};
Promise.prototype._cancelBy = function(canceller) {
if (canceller === this) { this._branchesRemainingToCancel = 0; this._invokeOnCancel(); return true; } else { this._branchHasCancelled(); if (this._enoughBranchesHaveCancelled()) { this._invokeOnCancel(); return true; } } return false;
};
Promise.prototype._cancelBranched = function() {
if (this._enoughBranchesHaveCancelled()) { this._cancel(); }
};
Promise.prototype._cancel = function() {
if (!this._isCancellable()) return; this._setCancelled(); async.invoke(this._cancelPromises, this, undefined);
};
Promise.prototype._cancelPromises = function() {
if (this._length() > 0) this._settlePromises();
};
Promise.prototype._unsetOnCancel = function() {
this._onCancelField = undefined;
};
Promise.prototype._isCancellable = function() {
return this.isPending() && !this._isCancelled();
};
Promise.prototype.isCancellable = function() {
return this.isPending() && !this.isCancelled();
};
Promise.prototype._doInvokeOnCancel = function(onCancelCallback, internalOnly) {
if (util.isArray(onCancelCallback)) { for (var i = 0; i < onCancelCallback.length; ++i) { this._doInvokeOnCancel(onCancelCallback[i], internalOnly); } } else if (onCancelCallback !== undefined) { if (typeof onCancelCallback === "function") { if (!internalOnly) { var e = tryCatch(onCancelCallback).call(this._boundValue()); if (e === errorObj) { this._attachExtraTrace(e.e); async.throwLater(e.e); } } } else { onCancelCallback._resultCancelled(this); } }
};
Promise.prototype._invokeOnCancel = function() {
var onCancelCallback = this._onCancel(); this._unsetOnCancel(); async.invoke(this._doInvokeOnCancel, this, onCancelCallback);
};
Promise.prototype._invokeInternalOnCancel = function() {
if (this._isCancellable()) { this._doInvokeOnCancel(this._onCancel(), true); this._unsetOnCancel(); }
};
Promise.prototype._resultCancelled = function() {
this.cancel();
};
};