1 | import { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe';
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2 | export function mergeScan(accumulator, seed, concurrent = Number.POSITIVE_INFINITY) {
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3 | return (source) => source.lift(new MergeScanOperator(accumulator, seed, concurrent));
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4 | }
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5 | export class MergeScanOperator {
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6 | constructor(accumulator, seed, concurrent) {
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7 | this.accumulator = accumulator;
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8 | this.seed = seed;
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9 | this.concurrent = concurrent;
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10 | }
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11 | call(subscriber, source) {
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12 | return source.subscribe(new MergeScanSubscriber(subscriber, this.accumulator, this.seed, this.concurrent));
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13 | }
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14 | }
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15 | export class MergeScanSubscriber extends SimpleOuterSubscriber {
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16 | constructor(destination, accumulator, acc, concurrent) {
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17 | super(destination);
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18 | this.accumulator = accumulator;
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19 | this.acc = acc;
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20 | this.concurrent = concurrent;
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21 | this.hasValue = false;
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22 | this.hasCompleted = false;
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23 | this.buffer = [];
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24 | this.active = 0;
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25 | this.index = 0;
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26 | }
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27 | _next(value) {
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28 | if (this.active < this.concurrent) {
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29 | const index = this.index++;
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30 | const destination = this.destination;
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31 | let ish;
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32 | try {
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33 | const { accumulator } = this;
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34 | ish = accumulator(this.acc, value, index);
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35 | }
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36 | catch (e) {
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37 | return destination.error(e);
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38 | }
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39 | this.active++;
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40 | this._innerSub(ish);
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41 | }
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42 | else {
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43 | this.buffer.push(value);
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44 | }
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45 | }
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46 | _innerSub(ish) {
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47 | const innerSubscriber = new SimpleInnerSubscriber(this);
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48 | const destination = this.destination;
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49 | destination.add(innerSubscriber);
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50 | const innerSubscription = innerSubscribe(ish, innerSubscriber);
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51 | if (innerSubscription !== innerSubscriber) {
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52 | destination.add(innerSubscription);
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53 | }
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54 | }
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55 | _complete() {
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56 | this.hasCompleted = true;
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57 | if (this.active === 0 && this.buffer.length === 0) {
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58 | if (this.hasValue === false) {
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59 | this.destination.next(this.acc);
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60 | }
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61 | this.destination.complete();
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62 | }
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63 | this.unsubscribe();
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64 | }
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65 | notifyNext(innerValue) {
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66 | const { destination } = this;
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67 | this.acc = innerValue;
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68 | this.hasValue = true;
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69 | destination.next(innerValue);
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70 | }
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71 | notifyComplete() {
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72 | const buffer = this.buffer;
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73 | this.active--;
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74 | if (buffer.length > 0) {
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75 | this._next(buffer.shift());
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76 | }
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77 | else if (this.active === 0 && this.hasCompleted) {
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78 | if (this.hasValue === false) {
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79 | this.destination.next(this.acc);
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80 | }
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81 | this.destination.complete();
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82 | }
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83 | }
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84 | }
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85 | //# sourceMappingURL=mergeScan.js.map |
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