89 lines
2.8 KiB
JavaScript
89 lines
2.8 KiB
JavaScript
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import { isScheduler } from '../util/isScheduler';
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import { isArray } from '../util/isArray';
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import { OuterSubscriber } from '../OuterSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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import { fromArray } from './fromArray';
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const NONE = {};
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export function combineLatest(...observables) {
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let resultSelector = undefined;
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let scheduler = undefined;
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if (isScheduler(observables[observables.length - 1])) {
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scheduler = observables.pop();
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}
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if (typeof observables[observables.length - 1] === 'function') {
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resultSelector = observables.pop();
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}
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if (observables.length === 1 && isArray(observables[0])) {
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observables = observables[0];
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}
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return fromArray(observables, scheduler).lift(new CombineLatestOperator(resultSelector));
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}
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export class CombineLatestOperator {
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constructor(resultSelector) {
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this.resultSelector = resultSelector;
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}
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call(subscriber, source) {
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return source.subscribe(new CombineLatestSubscriber(subscriber, this.resultSelector));
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}
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}
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export class CombineLatestSubscriber extends OuterSubscriber {
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constructor(destination, resultSelector) {
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super(destination);
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this.resultSelector = resultSelector;
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this.active = 0;
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this.values = [];
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this.observables = [];
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}
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_next(observable) {
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this.values.push(NONE);
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this.observables.push(observable);
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}
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_complete() {
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const observables = this.observables;
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const len = observables.length;
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if (len === 0) {
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this.destination.complete();
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}
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else {
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this.active = len;
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this.toRespond = len;
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for (let i = 0; i < len; i++) {
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const 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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}
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notifyComplete(unused) {
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if ((this.active -= 1) === 0) {
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this.destination.complete();
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}
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}
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notifyNext(_outerValue, innerValue, outerIndex) {
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const values = this.values;
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const oldVal = values[outerIndex];
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const toRespond = !this.toRespond
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? 0
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: oldVal === NONE ? --this.toRespond : this.toRespond;
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values[outerIndex] = innerValue;
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if (toRespond === 0) {
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if (this.resultSelector) {
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this._tryResultSelector(values);
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}
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else {
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this.destination.next(values.slice());
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}
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}
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}
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_tryResultSelector(values) {
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let result;
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try {
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result = this.resultSelector.apply(this, values);
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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=combineLatest.js.map
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