100 lines
2.6 KiB
JavaScript
100 lines
2.6 KiB
JavaScript
"use strict";
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module.exports = function(Promise, NEXT_FILTER, tryConvertToPromise) {
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var util = require("./util.js");
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var wrapsPrimitiveReceiver = util.wrapsPrimitiveReceiver;
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var isPrimitive = util.isPrimitive;
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var thrower = util.thrower;
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function returnThis() {
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return this;
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}
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function throwThis() {
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throw this;
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}
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function return$(r) {
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return function() {
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return r;
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};
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}
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function throw$(r) {
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return function() {
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throw r;
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};
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}
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function promisedFinally(ret, reasonOrValue, isFulfilled) {
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var then;
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if (wrapsPrimitiveReceiver && isPrimitive(reasonOrValue)) {
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then = isFulfilled ? return$(reasonOrValue) : throw$(reasonOrValue);
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} else {
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then = isFulfilled ? returnThis : throwThis;
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}
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return ret._then(then, thrower, undefined, reasonOrValue, undefined);
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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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var ret = promise._isBound()
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? handler.call(promise._boundTo)
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: handler();
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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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maybePromise = maybePromise._target();
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return promisedFinally(maybePromise, reasonOrValue,
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promise.isFulfilled());
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}
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}
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if (promise.isRejected()) {
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NEXT_FILTER.e = reasonOrValue;
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return NEXT_FILTER;
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} else {
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return reasonOrValue;
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}
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}
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function tapHandler(value) {
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var promise = this.promise;
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var handler = this.handler;
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var ret = promise._isBound()
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? handler.call(promise._boundTo, value)
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: handler(value);
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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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maybePromise = maybePromise._target();
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return promisedFinally(maybePromise, value, true);
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}
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}
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return value;
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}
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Promise.prototype._passThroughHandler = function (handler, isFinally) {
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if (typeof handler !== "function") return this.then();
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var promiseAndHandler = {
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promise: this,
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handler: handler
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};
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return this._then(
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isFinally ? finallyHandler : tapHandler,
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isFinally ? finallyHandler : undefined, undefined,
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promiseAndHandler, 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._passThroughHandler(handler, true);
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};
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Promise.prototype.tap = function (handler) {
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return this._passThroughHandler(handler, false);
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};
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};
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