73 lines
2.2 KiB
JavaScript
73 lines
2.2 KiB
JavaScript
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import { OuterSubscriber } from '../OuterSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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export function withLatestFrom(...args) {
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return (source) => {
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let project;
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if (typeof args[args.length - 1] === 'function') {
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project = args.pop();
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}
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const observables = args;
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return source.lift(new WithLatestFromOperator(observables, project));
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};
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}
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class WithLatestFromOperator {
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constructor(observables, project) {
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this.observables = observables;
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this.project = project;
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}
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call(subscriber, source) {
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return source.subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project));
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}
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}
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class WithLatestFromSubscriber extends OuterSubscriber {
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constructor(destination, observables, project) {
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super(destination);
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this.observables = observables;
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this.project = project;
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this.toRespond = [];
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const len = observables.length;
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this.values = new Array(len);
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for (let i = 0; i < len; i++) {
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this.toRespond.push(i);
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}
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for (let i = 0; i < len; i++) {
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let observable = observables[i];
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this.add(subscribeToResult(this, observable, undefined, i));
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}
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}
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notifyNext(_outerValue, innerValue, outerIndex) {
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this.values[outerIndex] = innerValue;
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const toRespond = this.toRespond;
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if (toRespond.length > 0) {
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const found = toRespond.indexOf(outerIndex);
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if (found !== -1) {
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toRespond.splice(found, 1);
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}
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}
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}
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notifyComplete() {
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}
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_next(value) {
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if (this.toRespond.length === 0) {
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const args = [value, ...this.values];
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if (this.project) {
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this._tryProject(args);
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}
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else {
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this.destination.next(args);
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}
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}
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}
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_tryProject(args) {
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let result;
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try {
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result = this.project.apply(this, args);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.destination.next(result);
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}
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}
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//# sourceMappingURL=withLatestFrom.js.map
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