1 | 'use strict';
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2 | var bind = require('../internals/function-bind-context');
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3 | var uncurryThis = require('../internals/function-uncurry-this');
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4 | var toObject = require('../internals/to-object');
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5 | var isConstructor = require('../internals/is-constructor');
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6 | var getAsyncIterator = require('../internals/get-async-iterator');
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7 | var getIterator = require('../internals/get-iterator');
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8 | var getIteratorDirect = require('../internals/get-iterator-direct');
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9 | var getIteratorMethod = require('../internals/get-iterator-method');
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10 | var getMethod = require('../internals/get-method');
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11 | var getBuiltIn = require('../internals/get-built-in');
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12 | var getBuiltInPrototypeMethod = require('../internals/get-built-in-prototype-method');
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13 | var wellKnownSymbol = require('../internals/well-known-symbol');
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14 | var AsyncFromSyncIterator = require('../internals/async-from-sync-iterator');
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15 | var toArray = require('../internals/async-iterator-iteration').toArray;
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16 |
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17 | var ASYNC_ITERATOR = wellKnownSymbol('asyncIterator');
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18 | var arrayIterator = uncurryThis(getBuiltInPrototypeMethod('Array', 'values'));
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19 | var arrayIteratorNext = uncurryThis(arrayIterator([]).next);
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20 |
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21 | var safeArrayIterator = function () {
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22 | return new SafeArrayIterator(this);
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23 | };
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24 |
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25 | var SafeArrayIterator = function (O) {
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26 | this.iterator = arrayIterator(O);
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27 | };
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28 |
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29 | SafeArrayIterator.prototype.next = function () {
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30 | return arrayIteratorNext(this.iterator);
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31 | };
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32 |
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33 |
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34 |
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35 | module.exports = function fromAsync(asyncItems /* , mapfn = undefined, thisArg = undefined */) {
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36 | var C = this;
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37 | var argumentsLength = arguments.length;
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38 | var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
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39 | var thisArg = argumentsLength > 2 ? arguments[2] : undefined;
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40 | return new (getBuiltIn('Promise'))(function (resolve) {
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41 | var O = toObject(asyncItems);
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42 | if (mapfn !== undefined) mapfn = bind(mapfn, thisArg);
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43 | var usingAsyncIterator = getMethod(O, ASYNC_ITERATOR);
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44 | var usingSyncIterator = usingAsyncIterator ? undefined : getIteratorMethod(O) || safeArrayIterator;
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45 | var A = isConstructor(C) ? new C() : [];
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46 | var iterator = usingAsyncIterator
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47 | ? getAsyncIterator(O, usingAsyncIterator)
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48 | : new AsyncFromSyncIterator(getIteratorDirect(getIterator(O, usingSyncIterator)));
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49 | resolve(toArray(iterator, mapfn, A));
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50 | });
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51 | };
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