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 closeAsyncIteration = require('../internals/async-iterator-close');
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11 | var IS_PURE = require('../internals/is-pure');
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12 |
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13 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise) {
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14 | var state = this;
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15 | var iterator = state.iterator;
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16 | var predicate = state.predicate;
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17 |
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18 | return new Promise(function (resolve, reject) {
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19 | var doneAndReject = function (error) {
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20 | state.done = true;
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21 | reject(error);
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22 | };
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23 |
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24 | var ifAbruptCloseAsyncIterator = function (error) {
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25 | closeAsyncIteration(iterator, doneAndReject, error, doneAndReject);
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26 | };
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27 |
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28 | var loop = function () {
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29 | try {
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30 | Promise.resolve(anObject(call(state.next, iterator))).then(function (step) {
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31 | try {
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32 | if (anObject(step).done) {
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33 | state.done = true;
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34 | resolve(createIterResultObject(undefined, true));
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35 | } else {
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36 | var value = step.value;
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37 | try {
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38 | var result = predicate(value, state.counter++);
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39 |
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40 | var handler = function (selected) {
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41 | selected ? resolve(createIterResultObject(value, false)) : loop();
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42 | };
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43 |
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44 | if (isObject(result)) Promise.resolve(result).then(handler, ifAbruptCloseAsyncIterator);
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45 | else handler(result);
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46 | } catch (error3) { ifAbruptCloseAsyncIterator(error3); }
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47 | }
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48 | } catch (error2) { doneAndReject(error2); }
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49 | }, doneAndReject);
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50 | } catch (error) { doneAndReject(error); }
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51 | };
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52 |
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53 | loop();
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54 | });
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55 | });
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56 |
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57 |
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58 |
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59 | $({ target: 'AsyncIterator', proto: true, real: true, forced: IS_PURE }, {
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60 | filter: function filter(predicate) {
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61 | anObject(this);
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62 | aCallable(predicate);
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63 | return new AsyncIteratorProxy(getIteratorDirect(this), {
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64 | predicate: predicate
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65 | });
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66 | }
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67 | });
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