93 lines
3.1 KiB
JavaScript
93 lines
3.1 KiB
JavaScript
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import { SafeSubscriber, Subscriber } from './Subscriber';
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import { isSubscription } from './Subscription';
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import { observable as Symbol_observable } from './symbol/observable';
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import { pipeFromArray } from './util/pipe';
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import { config } from './config';
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import { isFunction } from './util/isFunction';
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import { errorContext } from './util/errorContext';
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export class Observable {
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constructor(subscribe) {
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if (subscribe) {
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this._subscribe = subscribe;
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}
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}
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lift(operator) {
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const observable = new Observable();
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observable.source = this;
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observable.operator = operator;
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return observable;
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}
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subscribe(observerOrNext, error, complete) {
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const subscriber = isSubscriber(observerOrNext) ? observerOrNext : new SafeSubscriber(observerOrNext, error, complete);
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errorContext(() => {
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const { operator, source } = this;
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subscriber.add(operator
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?
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operator.call(subscriber, source)
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: source
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?
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this._subscribe(subscriber)
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:
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this._trySubscribe(subscriber));
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});
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return subscriber;
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}
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_trySubscribe(sink) {
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try {
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return this._subscribe(sink);
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}
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catch (err) {
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sink.error(err);
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}
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}
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forEach(next, promiseCtor) {
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promiseCtor = getPromiseCtor(promiseCtor);
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return new promiseCtor((resolve, reject) => {
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const subscriber = new SafeSubscriber({
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next: (value) => {
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try {
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next(value);
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}
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catch (err) {
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reject(err);
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subscriber.unsubscribe();
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}
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},
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error: reject,
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complete: resolve,
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});
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this.subscribe(subscriber);
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});
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}
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_subscribe(subscriber) {
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var _a;
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return (_a = this.source) === null || _a === void 0 ? void 0 : _a.subscribe(subscriber);
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}
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[Symbol_observable]() {
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return this;
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}
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pipe(...operations) {
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return pipeFromArray(operations)(this);
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}
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toPromise(promiseCtor) {
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promiseCtor = getPromiseCtor(promiseCtor);
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return new promiseCtor((resolve, reject) => {
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let value;
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this.subscribe((x) => (value = x), (err) => reject(err), () => resolve(value));
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});
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}
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}
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Observable.create = (subscribe) => {
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return new Observable(subscribe);
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};
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function getPromiseCtor(promiseCtor) {
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var _a;
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return (_a = promiseCtor !== null && promiseCtor !== void 0 ? promiseCtor : config.Promise) !== null && _a !== void 0 ? _a : Promise;
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}
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function isObserver(value) {
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return value && isFunction(value.next) && isFunction(value.error) && isFunction(value.complete);
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}
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function isSubscriber(value) {
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return (value && value instanceof Subscriber) || (isObserver(value) && isSubscription(value));
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}
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//# sourceMappingURL=Observable.js.map
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