107 lines
3.2 KiB
JavaScript
107 lines
3.2 KiB
JavaScript
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import { canReportError } from './util/canReportError';
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import { toSubscriber } from './util/toSubscriber';
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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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export class Observable {
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constructor(subscribe) {
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this._isScalar = false;
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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 { operator } = this;
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const sink = toSubscriber(observerOrNext, error, complete);
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if (operator) {
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sink.add(operator.call(sink, this.source));
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}
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else {
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sink.add(this.source || (config.useDeprecatedSynchronousErrorHandling && !sink.syncErrorThrowable) ?
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this._subscribe(sink) :
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this._trySubscribe(sink));
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}
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if (config.useDeprecatedSynchronousErrorHandling) {
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if (sink.syncErrorThrowable) {
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sink.syncErrorThrowable = false;
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if (sink.syncErrorThrown) {
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throw sink.syncErrorValue;
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}
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}
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}
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return sink;
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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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if (config.useDeprecatedSynchronousErrorHandling) {
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sink.syncErrorThrown = true;
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sink.syncErrorValue = err;
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}
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if (canReportError(sink)) {
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sink.error(err);
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}
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else {
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console.warn(err);
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}
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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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let subscription;
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subscription = this.subscribe((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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if (subscription) {
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subscription.unsubscribe();
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}
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}
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}, reject, resolve);
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});
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}
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_subscribe(subscriber) {
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const { source } = this;
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return source && source.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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if (operations.length === 0) {
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return this;
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}
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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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if (!promiseCtor) {
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promiseCtor = config.Promise || Promise;
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}
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if (!promiseCtor) {
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throw new Error('no Promise impl found');
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}
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return promiseCtor;
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}
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//# sourceMappingURL=Observable.js.map
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