1 | /** PURE_IMPORTS_START tslib,_map,_observable_from,_innerSubscribe PURE_IMPORTS_END */
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2 | import * as tslib_1 from "tslib";
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3 | import { map } from './map';
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4 | import { from } from '../observable/from';
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5 | import { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe';
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6 | export function mergeMap(project, resultSelector, concurrent) {
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7 | if (concurrent === void 0) {
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8 | concurrent = Number.POSITIVE_INFINITY;
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9 | }
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10 | if (typeof resultSelector === 'function') {
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11 | 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)); };
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12 | }
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13 | else if (typeof resultSelector === 'number') {
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14 | concurrent = resultSelector;
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15 | }
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16 | return function (source) { return source.lift(new MergeMapOperator(project, concurrent)); };
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17 | }
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18 | var MergeMapOperator = /*@__PURE__*/ (function () {
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19 | function MergeMapOperator(project, concurrent) {
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20 | if (concurrent === void 0) {
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21 | concurrent = Number.POSITIVE_INFINITY;
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22 | }
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23 | this.project = project;
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24 | this.concurrent = concurrent;
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25 | }
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26 | MergeMapOperator.prototype.call = function (observer, source) {
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27 | return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent));
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28 | };
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29 | return MergeMapOperator;
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30 | }());
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31 | export { MergeMapOperator };
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32 | var MergeMapSubscriber = /*@__PURE__*/ (function (_super) {
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33 | tslib_1.__extends(MergeMapSubscriber, _super);
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34 | function MergeMapSubscriber(destination, project, concurrent) {
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35 | if (concurrent === void 0) {
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36 | concurrent = Number.POSITIVE_INFINITY;
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37 | }
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38 | var _this = _super.call(this, destination) || this;
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39 | _this.project = project;
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40 | _this.concurrent = concurrent;
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41 | _this.hasCompleted = false;
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42 | _this.buffer = [];
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43 | _this.active = 0;
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44 | _this.index = 0;
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45 | return _this;
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46 | }
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47 | MergeMapSubscriber.prototype._next = function (value) {
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48 | if (this.active < this.concurrent) {
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49 | this._tryNext(value);
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50 | }
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51 | else {
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52 | this.buffer.push(value);
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53 | }
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54 | };
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55 | MergeMapSubscriber.prototype._tryNext = function (value) {
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56 | var result;
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57 | var index = this.index++;
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58 | try {
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59 | result = this.project(value, index);
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60 | }
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61 | catch (err) {
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62 | this.destination.error(err);
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63 | return;
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64 | }
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65 | this.active++;
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66 | this._innerSub(result);
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67 | };
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68 | MergeMapSubscriber.prototype._innerSub = function (ish) {
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69 | var innerSubscriber = new SimpleInnerSubscriber(this);
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70 | var destination = this.destination;
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71 | destination.add(innerSubscriber);
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72 | var innerSubscription = innerSubscribe(ish, innerSubscriber);
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73 | if (innerSubscription !== innerSubscriber) {
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74 | destination.add(innerSubscription);
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75 | }
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76 | };
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77 | MergeMapSubscriber.prototype._complete = function () {
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78 | this.hasCompleted = true;
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79 | if (this.active === 0 && this.buffer.length === 0) {
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80 | this.destination.complete();
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81 | }
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82 | this.unsubscribe();
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83 | };
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84 | MergeMapSubscriber.prototype.notifyNext = function (innerValue) {
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85 | this.destination.next(innerValue);
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86 | };
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87 | MergeMapSubscriber.prototype.notifyComplete = function () {
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88 | var buffer = this.buffer;
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89 | this.active--;
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90 | if (buffer.length > 0) {
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91 | this._next(buffer.shift());
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92 | }
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93 | else if (this.active === 0 && this.hasCompleted) {
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94 | this.destination.complete();
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95 | }
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96 | };
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97 | return MergeMapSubscriber;
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98 | }(SimpleOuterSubscriber));
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99 | export { MergeMapSubscriber };
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100 | export var flatMap = mergeMap;
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101 | //# sourceMappingURL=mergeMap.js.map
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