281 lines
9.2 KiB
JavaScript
281 lines
9.2 KiB
JavaScript
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'use strict';
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var LIBRARY = require('./_library');
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var global = require('./_global');
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var ctx = require('./_ctx');
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var classof = require('./_classof');
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var $export = require('./_export');
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var isObject = require('./_is-object');
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var aFunction = require('./_a-function');
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var anInstance = require('./_an-instance');
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var forOf = require('./_for-of');
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var speciesConstructor = require('./_species-constructor');
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var task = require('./_task').set;
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var microtask = require('./_microtask')();
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var newPromiseCapabilityModule = require('./_new-promise-capability');
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var perform = require('./_perform');
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var promiseResolve = require('./_promise-resolve');
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var PROMISE = 'Promise';
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var TypeError = global.TypeError;
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var process = global.process;
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var $Promise = global[PROMISE];
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var isNode = classof(process) == 'process';
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var empty = function () { /* empty */ };
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var Internal, newGenericPromiseCapability, OwnPromiseCapability, Wrapper;
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var newPromiseCapability = newGenericPromiseCapability = newPromiseCapabilityModule.f;
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var USE_NATIVE = !!function () {
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try {
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// correct subclassing with @@species support
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var promise = $Promise.resolve(1);
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var FakePromise = (promise.constructor = {})[require('./_wks')('species')] = function (exec) {
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exec(empty, empty);
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};
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// unhandled rejections tracking support, NodeJS Promise without it fails @@species test
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return (isNode || typeof PromiseRejectionEvent == 'function') && promise.then(empty) instanceof FakePromise;
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} catch (e) { /* empty */ }
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}();
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// helpers
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var isThenable = function (it) {
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var then;
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return isObject(it) && typeof (then = it.then) == 'function' ? then : false;
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};
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var notify = function (promise, isReject) {
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if (promise._n) return;
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promise._n = true;
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var chain = promise._c;
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microtask(function () {
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var value = promise._v;
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var ok = promise._s == 1;
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var i = 0;
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var run = function (reaction) {
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var handler = ok ? reaction.ok : reaction.fail;
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var resolve = reaction.resolve;
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var reject = reaction.reject;
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var domain = reaction.domain;
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var result, then;
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try {
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if (handler) {
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if (!ok) {
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if (promise._h == 2) onHandleUnhandled(promise);
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promise._h = 1;
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}
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if (handler === true) result = value;
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else {
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if (domain) domain.enter();
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result = handler(value);
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if (domain) domain.exit();
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}
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if (result === reaction.promise) {
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reject(TypeError('Promise-chain cycle'));
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} else if (then = isThenable(result)) {
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then.call(result, resolve, reject);
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} else resolve(result);
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} else reject(value);
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} catch (e) {
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reject(e);
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}
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};
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while (chain.length > i) run(chain[i++]); // variable length - can't use forEach
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promise._c = [];
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promise._n = false;
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if (isReject && !promise._h) onUnhandled(promise);
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});
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};
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var onUnhandled = function (promise) {
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task.call(global, function () {
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var value = promise._v;
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var unhandled = isUnhandled(promise);
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var result, handler, console;
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if (unhandled) {
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result = perform(function () {
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if (isNode) {
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process.emit('unhandledRejection', value, promise);
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} else if (handler = global.onunhandledrejection) {
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handler({ promise: promise, reason: value });
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} else if ((console = global.console) && console.error) {
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console.error('Unhandled promise rejection', value);
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}
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});
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// Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
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promise._h = isNode || isUnhandled(promise) ? 2 : 1;
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} promise._a = undefined;
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if (unhandled && result.e) throw result.v;
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});
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};
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var isUnhandled = function (promise) {
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if (promise._h == 1) return false;
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var chain = promise._a || promise._c;
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var i = 0;
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var reaction;
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while (chain.length > i) {
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reaction = chain[i++];
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if (reaction.fail || !isUnhandled(reaction.promise)) return false;
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} return true;
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};
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var onHandleUnhandled = function (promise) {
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task.call(global, function () {
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var handler;
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if (isNode) {
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process.emit('rejectionHandled', promise);
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} else if (handler = global.onrejectionhandled) {
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handler({ promise: promise, reason: promise._v });
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}
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});
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};
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var $reject = function (value) {
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var promise = this;
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if (promise._d) return;
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promise._d = true;
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promise = promise._w || promise; // unwrap
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promise._v = value;
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promise._s = 2;
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if (!promise._a) promise._a = promise._c.slice();
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notify(promise, true);
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};
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var $resolve = function (value) {
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var promise = this;
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var then;
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if (promise._d) return;
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promise._d = true;
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promise = promise._w || promise; // unwrap
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try {
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if (promise === value) throw TypeError("Promise can't be resolved itself");
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if (then = isThenable(value)) {
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microtask(function () {
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var wrapper = { _w: promise, _d: false }; // wrap
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try {
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then.call(value, ctx($resolve, wrapper, 1), ctx($reject, wrapper, 1));
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} catch (e) {
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$reject.call(wrapper, e);
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}
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});
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} else {
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promise._v = value;
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promise._s = 1;
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notify(promise, false);
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}
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} catch (e) {
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$reject.call({ _w: promise, _d: false }, e); // wrap
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}
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};
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// constructor polyfill
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if (!USE_NATIVE) {
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// 25.4.3.1 Promise(executor)
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$Promise = function Promise(executor) {
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anInstance(this, $Promise, PROMISE, '_h');
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aFunction(executor);
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Internal.call(this);
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try {
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executor(ctx($resolve, this, 1), ctx($reject, this, 1));
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} catch (err) {
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$reject.call(this, err);
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}
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};
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// eslint-disable-next-line no-unused-vars
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Internal = function Promise(executor) {
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this._c = []; // <- awaiting reactions
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this._a = undefined; // <- checked in isUnhandled reactions
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this._s = 0; // <- state
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this._d = false; // <- done
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this._v = undefined; // <- value
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this._h = 0; // <- rejection state, 0 - default, 1 - handled, 2 - unhandled
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this._n = false; // <- notify
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};
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Internal.prototype = require('./_redefine-all')($Promise.prototype, {
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// 25.4.5.3 Promise.prototype.then(onFulfilled, onRejected)
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then: function then(onFulfilled, onRejected) {
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var reaction = newPromiseCapability(speciesConstructor(this, $Promise));
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reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;
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reaction.fail = typeof onRejected == 'function' && onRejected;
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reaction.domain = isNode ? process.domain : undefined;
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this._c.push(reaction);
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if (this._a) this._a.push(reaction);
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if (this._s) notify(this, false);
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return reaction.promise;
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},
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// 25.4.5.1 Promise.prototype.catch(onRejected)
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'catch': function (onRejected) {
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return this.then(undefined, onRejected);
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}
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});
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OwnPromiseCapability = function () {
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var promise = new Internal();
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this.promise = promise;
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this.resolve = ctx($resolve, promise, 1);
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this.reject = ctx($reject, promise, 1);
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};
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newPromiseCapabilityModule.f = newPromiseCapability = function (C) {
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return C === $Promise || C === Wrapper
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? new OwnPromiseCapability(C)
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: newGenericPromiseCapability(C);
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};
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}
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$export($export.G + $export.W + $export.F * !USE_NATIVE, { Promise: $Promise });
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require('./_set-to-string-tag')($Promise, PROMISE);
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require('./_set-species')(PROMISE);
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Wrapper = require('./_core')[PROMISE];
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// statics
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$export($export.S + $export.F * !USE_NATIVE, PROMISE, {
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// 25.4.4.5 Promise.reject(r)
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reject: function reject(r) {
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var capability = newPromiseCapability(this);
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var $$reject = capability.reject;
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$$reject(r);
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return capability.promise;
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}
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});
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$export($export.S + $export.F * (LIBRARY || !USE_NATIVE), PROMISE, {
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// 25.4.4.6 Promise.resolve(x)
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resolve: function resolve(x) {
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return promiseResolve(LIBRARY && this === Wrapper ? $Promise : this, x);
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}
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});
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$export($export.S + $export.F * !(USE_NATIVE && require('./_iter-detect')(function (iter) {
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$Promise.all(iter)['catch'](empty);
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})), PROMISE, {
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// 25.4.4.1 Promise.all(iterable)
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all: function all(iterable) {
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var C = this;
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var capability = newPromiseCapability(C);
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var resolve = capability.resolve;
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var reject = capability.reject;
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var result = perform(function () {
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var values = [];
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var index = 0;
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var remaining = 1;
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forOf(iterable, false, function (promise) {
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var $index = index++;
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var alreadyCalled = false;
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values.push(undefined);
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remaining++;
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C.resolve(promise).then(function (value) {
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if (alreadyCalled) return;
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alreadyCalled = true;
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values[$index] = value;
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--remaining || resolve(values);
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}, reject);
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});
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--remaining || resolve(values);
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});
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if (result.e) reject(result.v);
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return capability.promise;
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},
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// 25.4.4.4 Promise.race(iterable)
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race: function race(iterable) {
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var C = this;
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var capability = newPromiseCapability(C);
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var reject = capability.reject;
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var result = perform(function () {
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forOf(iterable, false, function (promise) {
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C.resolve(promise).then(capability.resolve, reject);
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});
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});
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if (result.e) reject(result.v);
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return capability.promise;
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}
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});
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