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80 lines
3.2 KiB
80 lines
3.2 KiB
4 years ago
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/** PURE_IMPORTS_START tslib,_OuterSubscriber,_InnerSubscriber,_util_subscribeToResult,_map,_observable_from PURE_IMPORTS_END */
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import * as tslib_1 from "tslib";
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import { OuterSubscriber } from '../OuterSubscriber';
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import { InnerSubscriber } from '../InnerSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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import { map } from './map';
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import { from } from '../observable/from';
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export function switchMap(project, resultSelector) {
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if (typeof resultSelector === 'function') {
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return function (source) { return source.pipe(switchMap(function (a, i) { return from(project(a, i)).pipe(map(function (b, ii) { return resultSelector(a, b, i, ii); })); })); };
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}
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return function (source) { return source.lift(new SwitchMapOperator(project)); };
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}
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var SwitchMapOperator = /*@__PURE__*/ (function () {
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function SwitchMapOperator(project) {
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this.project = project;
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}
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SwitchMapOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new SwitchMapSubscriber(subscriber, this.project));
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};
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return SwitchMapOperator;
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}());
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var SwitchMapSubscriber = /*@__PURE__*/ (function (_super) {
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tslib_1.__extends(SwitchMapSubscriber, _super);
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function SwitchMapSubscriber(destination, project) {
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var _this = _super.call(this, destination) || this;
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_this.project = project;
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_this.index = 0;
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return _this;
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}
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SwitchMapSubscriber.prototype._next = function (value) {
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var result;
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var index = this.index++;
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try {
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result = this.project(value, index);
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}
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catch (error) {
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this.destination.error(error);
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return;
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}
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this._innerSub(result, value, index);
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};
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SwitchMapSubscriber.prototype._innerSub = function (result, value, index) {
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var innerSubscription = this.innerSubscription;
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if (innerSubscription) {
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innerSubscription.unsubscribe();
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}
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var innerSubscriber = new InnerSubscriber(this, value, index);
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var destination = this.destination;
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destination.add(innerSubscriber);
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this.innerSubscription = subscribeToResult(this, result, undefined, undefined, innerSubscriber);
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if (this.innerSubscription !== innerSubscriber) {
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destination.add(this.innerSubscription);
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}
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};
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SwitchMapSubscriber.prototype._complete = function () {
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var innerSubscription = this.innerSubscription;
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if (!innerSubscription || innerSubscription.closed) {
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_super.prototype._complete.call(this);
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}
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this.unsubscribe();
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};
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SwitchMapSubscriber.prototype._unsubscribe = function () {
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this.innerSubscription = null;
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};
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SwitchMapSubscriber.prototype.notifyComplete = function (innerSub) {
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var destination = this.destination;
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destination.remove(innerSub);
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this.innerSubscription = null;
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if (this.isStopped) {
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_super.prototype._complete.call(this);
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}
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};
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SwitchMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this.destination.next(innerValue);
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};
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return SwitchMapSubscriber;
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}(OuterSubscriber));
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//# sourceMappingURL=switchMap.js.map
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