[6a3a178] | 1 | 'use strict';
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| 2 | // https://github.com/tc39/proposal-observable
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| 3 | var $ = require('../internals/export');
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| 4 | var DESCRIPTORS = require('../internals/descriptors');
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| 5 | var setSpecies = require('../internals/set-species');
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| 6 | var aFunction = require('../internals/a-function');
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| 7 | var anObject = require('../internals/an-object');
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| 8 | var isObject = require('../internals/is-object');
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| 9 | var anInstance = require('../internals/an-instance');
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| 10 | var defineProperty = require('../internals/object-define-property').f;
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| 11 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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| 12 | var redefineAll = require('../internals/redefine-all');
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| 13 | var getIterator = require('../internals/get-iterator');
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| 14 | var iterate = require('../internals/iterate');
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| 15 | var hostReportErrors = require('../internals/host-report-errors');
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| 16 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 17 | var InternalStateModule = require('../internals/internal-state');
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| 18 |
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| 19 | var OBSERVABLE = wellKnownSymbol('observable');
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| 20 | var getInternalState = InternalStateModule.get;
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| 21 | var setInternalState = InternalStateModule.set;
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| 22 |
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| 23 | var getMethod = function (fn) {
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| 24 | return fn == null ? undefined : aFunction(fn);
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| 25 | };
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| 26 |
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| 27 | var cleanupSubscription = function (subscriptionState) {
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| 28 | var cleanup = subscriptionState.cleanup;
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| 29 | if (cleanup) {
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| 30 | subscriptionState.cleanup = undefined;
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| 31 | try {
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| 32 | cleanup();
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| 33 | } catch (error) {
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| 34 | hostReportErrors(error);
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| 35 | }
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| 36 | }
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| 37 | };
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| 38 |
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| 39 | var subscriptionClosed = function (subscriptionState) {
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| 40 | return subscriptionState.observer === undefined;
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| 41 | };
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| 42 |
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| 43 | var close = function (subscriptionState) {
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| 44 | var subscription = subscriptionState.facade;
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| 45 | if (!DESCRIPTORS) {
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| 46 | subscription.closed = true;
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| 47 | var subscriptionObserver = subscriptionState.subscriptionObserver;
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| 48 | if (subscriptionObserver) subscriptionObserver.closed = true;
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| 49 | } subscriptionState.observer = undefined;
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| 50 | };
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| 51 |
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| 52 | var Subscription = function (observer, subscriber) {
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| 53 | var subscriptionState = setInternalState(this, {
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| 54 | cleanup: undefined,
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| 55 | observer: anObject(observer),
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| 56 | subscriptionObserver: undefined
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| 57 | });
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| 58 | var start;
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| 59 | if (!DESCRIPTORS) this.closed = false;
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| 60 | try {
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| 61 | if (start = getMethod(observer.start)) start.call(observer, this);
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| 62 | } catch (error) {
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| 63 | hostReportErrors(error);
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| 64 | }
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| 65 | if (subscriptionClosed(subscriptionState)) return;
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| 66 | var subscriptionObserver = subscriptionState.subscriptionObserver = new SubscriptionObserver(this);
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| 67 | try {
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| 68 | var cleanup = subscriber(subscriptionObserver);
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| 69 | var subscription = cleanup;
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| 70 | if (cleanup != null) subscriptionState.cleanup = typeof cleanup.unsubscribe === 'function'
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| 71 | ? function () { subscription.unsubscribe(); }
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| 72 | : aFunction(cleanup);
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| 73 | } catch (error) {
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| 74 | subscriptionObserver.error(error);
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| 75 | return;
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| 76 | } if (subscriptionClosed(subscriptionState)) cleanupSubscription(subscriptionState);
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| 77 | };
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| 78 |
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| 79 | Subscription.prototype = redefineAll({}, {
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| 80 | unsubscribe: function unsubscribe() {
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| 81 | var subscriptionState = getInternalState(this);
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| 82 | if (!subscriptionClosed(subscriptionState)) {
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| 83 | close(subscriptionState);
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| 84 | cleanupSubscription(subscriptionState);
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| 85 | }
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| 86 | }
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| 87 | });
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| 88 |
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| 89 | if (DESCRIPTORS) defineProperty(Subscription.prototype, 'closed', {
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| 90 | configurable: true,
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| 91 | get: function () {
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| 92 | return subscriptionClosed(getInternalState(this));
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| 93 | }
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| 94 | });
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| 95 |
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| 96 | var SubscriptionObserver = function (subscription) {
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| 97 | setInternalState(this, { subscription: subscription });
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| 98 | if (!DESCRIPTORS) this.closed = false;
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| 99 | };
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| 100 |
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| 101 | SubscriptionObserver.prototype = redefineAll({}, {
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| 102 | next: function next(value) {
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| 103 | var subscriptionState = getInternalState(getInternalState(this).subscription);
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| 104 | if (!subscriptionClosed(subscriptionState)) {
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| 105 | var observer = subscriptionState.observer;
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| 106 | try {
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| 107 | var nextMethod = getMethod(observer.next);
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| 108 | if (nextMethod) nextMethod.call(observer, value);
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| 109 | } catch (error) {
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| 110 | hostReportErrors(error);
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| 111 | }
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| 112 | }
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| 113 | },
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| 114 | error: function error(value) {
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| 115 | var subscriptionState = getInternalState(getInternalState(this).subscription);
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| 116 | if (!subscriptionClosed(subscriptionState)) {
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| 117 | var observer = subscriptionState.observer;
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| 118 | close(subscriptionState);
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| 119 | try {
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| 120 | var errorMethod = getMethod(observer.error);
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| 121 | if (errorMethod) errorMethod.call(observer, value);
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| 122 | else hostReportErrors(value);
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| 123 | } catch (err) {
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| 124 | hostReportErrors(err);
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| 125 | } cleanupSubscription(subscriptionState);
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| 126 | }
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| 127 | },
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| 128 | complete: function complete() {
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| 129 | var subscriptionState = getInternalState(getInternalState(this).subscription);
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| 130 | if (!subscriptionClosed(subscriptionState)) {
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| 131 | var observer = subscriptionState.observer;
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| 132 | close(subscriptionState);
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| 133 | try {
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| 134 | var completeMethod = getMethod(observer.complete);
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| 135 | if (completeMethod) completeMethod.call(observer);
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| 136 | } catch (error) {
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| 137 | hostReportErrors(error);
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| 138 | } cleanupSubscription(subscriptionState);
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| 139 | }
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| 140 | }
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| 141 | });
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| 142 |
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| 143 | if (DESCRIPTORS) defineProperty(SubscriptionObserver.prototype, 'closed', {
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| 144 | configurable: true,
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| 145 | get: function () {
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| 146 | return subscriptionClosed(getInternalState(getInternalState(this).subscription));
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| 147 | }
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| 148 | });
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| 149 |
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| 150 | var $Observable = function Observable(subscriber) {
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| 151 | anInstance(this, $Observable, 'Observable');
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| 152 | setInternalState(this, { subscriber: aFunction(subscriber) });
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| 153 | };
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| 154 |
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| 155 | redefineAll($Observable.prototype, {
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| 156 | subscribe: function subscribe(observer) {
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| 157 | var length = arguments.length;
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| 158 | return new Subscription(typeof observer === 'function' ? {
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| 159 | next: observer,
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| 160 | error: length > 1 ? arguments[1] : undefined,
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| 161 | complete: length > 2 ? arguments[2] : undefined
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| 162 | } : isObject(observer) ? observer : {}, getInternalState(this).subscriber);
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| 163 | }
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| 164 | });
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| 165 |
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| 166 | redefineAll($Observable, {
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| 167 | from: function from(x) {
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| 168 | var C = typeof this === 'function' ? this : $Observable;
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| 169 | var observableMethod = getMethod(anObject(x)[OBSERVABLE]);
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| 170 | if (observableMethod) {
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| 171 | var observable = anObject(observableMethod.call(x));
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| 172 | return observable.constructor === C ? observable : new C(function (observer) {
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| 173 | return observable.subscribe(observer);
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| 174 | });
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| 175 | }
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| 176 | var iterator = getIterator(x);
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| 177 | return new C(function (observer) {
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| 178 | iterate(iterator, function (it, stop) {
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| 179 | observer.next(it);
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| 180 | if (observer.closed) return stop();
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| 181 | }, { IS_ITERATOR: true, INTERRUPTED: true });
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| 182 | observer.complete();
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| 183 | });
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| 184 | },
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| 185 | of: function of() {
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| 186 | var C = typeof this === 'function' ? this : $Observable;
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| 187 | var length = arguments.length;
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| 188 | var items = new Array(length);
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| 189 | var index = 0;
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| 190 | while (index < length) items[index] = arguments[index++];
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| 191 | return new C(function (observer) {
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| 192 | for (var i = 0; i < length; i++) {
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| 193 | observer.next(items[i]);
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| 194 | if (observer.closed) return;
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| 195 | } observer.complete();
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| 196 | });
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| 197 | }
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| 198 | });
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| 199 |
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| 200 | createNonEnumerableProperty($Observable.prototype, OBSERVABLE, function () { return this; });
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| 201 |
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| 202 | $({ global: true }, {
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| 203 | Observable: $Observable
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| 204 | });
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| 205 |
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| 206 | setSpecies('Observable');
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