1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var call = require('../internals/function-call');
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4 | var aCallable = require('../internals/a-callable');
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5 | var anObject = require('../internals/an-object');
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6 | var isObject = require('../internals/is-object');
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7 | var getIteratorDirect = require('../internals/get-iterator-direct');
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8 | var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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9 | var createIterResultObject = require('../internals/create-iter-result-object');
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10 | var getAsyncIteratorFlattenable = require('../internals/get-async-iterator-flattenable');
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11 | var closeAsyncIteration = require('../internals/async-iterator-close');
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12 | var IS_PURE = require('../internals/is-pure');
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13 |
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14 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise) {
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15 | var state = this;
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16 | var iterator = state.iterator;
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17 | var mapper = state.mapper;
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18 |
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19 | return new Promise(function (resolve, reject) {
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20 | var doneAndReject = function (error) {
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21 | state.done = true;
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22 | reject(error);
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23 | };
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24 |
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25 | var ifAbruptCloseAsyncIterator = function (error) {
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26 | closeAsyncIteration(iterator, doneAndReject, error, doneAndReject);
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27 | };
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28 |
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29 | var outerLoop = function () {
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30 | try {
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31 | Promise.resolve(anObject(call(state.next, iterator))).then(function (step) {
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32 | try {
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33 | if (anObject(step).done) {
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34 | state.done = true;
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35 | resolve(createIterResultObject(undefined, true));
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36 | } else {
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37 | var value = step.value;
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38 | try {
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39 | var result = mapper(value, state.counter++);
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40 |
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41 | var handler = function (mapped) {
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42 | try {
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43 | state.inner = getAsyncIteratorFlattenable(mapped);
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44 | innerLoop();
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45 | } catch (error4) { ifAbruptCloseAsyncIterator(error4); }
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46 | };
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47 |
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48 | if (isObject(result)) Promise.resolve(result).then(handler, ifAbruptCloseAsyncIterator);
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49 | else handler(result);
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50 | } catch (error3) { ifAbruptCloseAsyncIterator(error3); }
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51 | }
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52 | } catch (error2) { doneAndReject(error2); }
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53 | }, doneAndReject);
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54 | } catch (error) { doneAndReject(error); }
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55 | };
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56 |
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57 | var innerLoop = function () {
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58 | var inner = state.inner;
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59 | if (inner) {
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60 | try {
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61 | Promise.resolve(anObject(call(inner.next, inner.iterator))).then(function (result) {
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62 | try {
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63 | if (anObject(result).done) {
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64 | state.inner = null;
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65 | outerLoop();
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66 | } else resolve(createIterResultObject(result.value, false));
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67 | } catch (error1) { ifAbruptCloseAsyncIterator(error1); }
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68 | }, ifAbruptCloseAsyncIterator);
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69 | } catch (error) { ifAbruptCloseAsyncIterator(error); }
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70 | } else outerLoop();
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71 | };
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72 |
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73 | innerLoop();
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74 | });
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75 | });
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76 |
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77 |
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78 |
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79 | $({ target: 'AsyncIterator', proto: true, real: true, forced: IS_PURE }, {
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80 | flatMap: function flatMap(mapper) {
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81 | anObject(this);
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82 | aCallable(mapper);
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83 | return new AsyncIteratorProxy(getIteratorDirect(this), {
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84 | mapper: mapper,
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85 | inner: null
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86 | });
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87 | }
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88 | });
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