100 lines
2.9 KiB
JavaScript
100 lines
2.9 KiB
JavaScript
"use strict";
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module.exports = function(Promise, tryConvertToPromise) {
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var util = require("./util");
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var CancellationError = Promise.CancellationError;
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var errorObj = util.errorObj;
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function FinallyHandlerCancelReaction(finallyHandler) {
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this.finallyHandler = finallyHandler;
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}
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FinallyHandlerCancelReaction.prototype._resultCancelled = function() {
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checkCancel(this.finallyHandler);
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};
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function checkCancel(ctx, reason) {
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if (ctx.cancelPromise != null) {
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if (arguments.length > 1) {
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ctx.cancelPromise._reject(reason);
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} else {
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ctx.cancelPromise._cancel();
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}
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ctx.cancelPromise = null;
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return true;
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}
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return false;
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}
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function succeed() {
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return finallyHandler.call(this, this.promise._target()._settledValue());
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}
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function fail(reason) {
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if (checkCancel(this, reason)) return;
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errorObj.e = reason;
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return errorObj;
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}
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function finallyHandler(reasonOrValue) {
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var promise = this.promise;
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var handler = this.handler;
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if (!this.called) {
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this.called = true;
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var ret = this.type === 0
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? handler.call(promise._boundValue())
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: handler.call(promise._boundValue(), reasonOrValue);
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if (ret !== undefined) {
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var maybePromise = tryConvertToPromise(ret, promise);
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if (maybePromise instanceof Promise) {
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if (this.cancelPromise != null) {
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if (maybePromise.isCancelled()) {
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var reason =
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new CancellationError("late cancellation observer");
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promise._attachExtraTrace(reason);
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errorObj.e = reason;
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return errorObj;
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} else if (maybePromise.isPending()) {
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maybePromise._attachCancellationCallback(
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new FinallyHandlerCancelReaction(this));
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}
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}
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return maybePromise._then(
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succeed, fail, undefined, this, undefined);
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}
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}
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}
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if (promise.isRejected()) {
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checkCancel(this);
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errorObj.e = reasonOrValue;
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return errorObj;
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} else {
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checkCancel(this);
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return reasonOrValue;
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}
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}
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Promise.prototype._passThrough = function(handler, type, success, fail) {
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if (typeof handler !== "function") return this.then();
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return this._then(success, fail, undefined, {
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promise: this,
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handler: handler,
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called: false,
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cancelPromise: null,
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type: type
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}, undefined);
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};
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Promise.prototype.lastly =
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Promise.prototype["finally"] = function (handler) {
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return this._passThrough(handler,
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0,
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finallyHandler,
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finallyHandler);
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};
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Promise.prototype.tap = function (handler) {
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return this._passThrough(handler, 1, finallyHandler);
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};
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return finallyHandler;
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};
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