--- /dev/null
+/** PURE_IMPORTS_START tslib,_util_subscribeToResult,_OuterSubscriber,_InnerSubscriber,_map,_observable_from PURE_IMPORTS_END */
+import * as tslib_1 from "tslib";
+import { subscribeToResult } from '../util/subscribeToResult';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { map } from './map';
+import { from } from '../observable/from';
+export function mergeMap(project, resultSelector, concurrent) {
+ if (concurrent === void 0) {
+ concurrent = Number.POSITIVE_INFINITY;
+ }
+ if (typeof resultSelector === 'function') {
+ return function (source) { return source.pipe(mergeMap(function (a, i) { return from(project(a, i)).pipe(map(function (b, ii) { return resultSelector(a, b, i, ii); })); }, concurrent)); };
+ }
+ else if (typeof resultSelector === 'number') {
+ concurrent = resultSelector;
+ }
+ return function (source) { return source.lift(new MergeMapOperator(project, concurrent)); };
+}
+var MergeMapOperator = /*@__PURE__*/ (function () {
+ function MergeMapOperator(project, concurrent) {
+ if (concurrent === void 0) {
+ concurrent = Number.POSITIVE_INFINITY;
+ }
+ this.project = project;
+ this.concurrent = concurrent;
+ }
+ MergeMapOperator.prototype.call = function (observer, source) {
+ return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent));
+ };
+ return MergeMapOperator;
+}());
+export { MergeMapOperator };
+var MergeMapSubscriber = /*@__PURE__*/ (function (_super) {
+ tslib_1.__extends(MergeMapSubscriber, _super);
+ function MergeMapSubscriber(destination, project, concurrent) {
+ if (concurrent === void 0) {
+ concurrent = Number.POSITIVE_INFINITY;
+ }
+ var _this = _super.call(this, destination) || this;
+ _this.project = project;
+ _this.concurrent = concurrent;
+ _this.hasCompleted = false;
+ _this.buffer = [];
+ _this.active = 0;
+ _this.index = 0;
+ return _this;
+ }
+ MergeMapSubscriber.prototype._next = function (value) {
+ if (this.active < this.concurrent) {
+ this._tryNext(value);
+ }
+ else {
+ this.buffer.push(value);
+ }
+ };
+ MergeMapSubscriber.prototype._tryNext = function (value) {
+ var result;
+ var index = this.index++;
+ try {
+ result = this.project(value, index);
+ }
+ catch (err) {
+ this.destination.error(err);
+ return;
+ }
+ this.active++;
+ this._innerSub(result, value, index);
+ };
+ MergeMapSubscriber.prototype._innerSub = function (ish, value, index) {
+ var innerSubscriber = new InnerSubscriber(this, value, index);
+ var destination = this.destination;
+ destination.add(innerSubscriber);
+ var innerSubscription = subscribeToResult(this, ish, undefined, undefined, innerSubscriber);
+ if (innerSubscription !== innerSubscriber) {
+ destination.add(innerSubscription);
+ }
+ };
+ MergeMapSubscriber.prototype._complete = function () {
+ this.hasCompleted = true;
+ if (this.active === 0 && this.buffer.length === 0) {
+ this.destination.complete();
+ }
+ this.unsubscribe();
+ };
+ MergeMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+ this.destination.next(innerValue);
+ };
+ MergeMapSubscriber.prototype.notifyComplete = function (innerSub) {
+ var buffer = this.buffer;
+ this.remove(innerSub);
+ this.active--;
+ if (buffer.length > 0) {
+ this._next(buffer.shift());
+ }
+ else if (this.active === 0 && this.hasCompleted) {
+ this.destination.complete();
+ }
+ };
+ return MergeMapSubscriber;
+}(OuterSubscriber));
+export { MergeMapSubscriber };
+export var flatMap = mergeMap;
+//# sourceMappingURL=mergeMap.js.map