Last change
on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
1.3 KB
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[6a3a178] | 1 | 'use strict';
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| 2 | // https://github.com/tc39/proposal-iterator-helpers
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| 3 | var $ = require('../internals/export');
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| 4 | var anObject = require('../internals/an-object');
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| 5 | var toPositiveInteger = require('../internals/to-positive-integer');
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| 6 | var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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| 7 |
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| 8 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg, Promise) {
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| 9 | var state = this;
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| 10 |
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| 11 | return new Promise(function (resolve, reject) {
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| 12 | var loop = function () {
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| 13 | try {
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| 14 | Promise.resolve(
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| 15 | anObject(state.next.call(state.iterator, state.remaining ? undefined : arg))
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| 16 | ).then(function (step) {
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| 17 | try {
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| 18 | if (anObject(step).done) {
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| 19 | state.done = true;
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| 20 | resolve({ done: true, value: undefined });
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| 21 | } else if (state.remaining) {
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| 22 | state.remaining--;
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| 23 | loop();
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| 24 | } else resolve({ done: false, value: step.value });
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| 25 | } catch (err) { reject(err); }
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| 26 | }, reject);
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| 27 | } catch (error) { reject(error); }
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| 28 | };
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| 29 |
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| 30 | loop();
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| 31 | });
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| 32 | });
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| 33 |
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| 34 | $({ target: 'AsyncIterator', proto: true, real: true }, {
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| 35 | drop: function drop(limit) {
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| 36 | return new AsyncIteratorProxy({
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| 37 | iterator: anObject(this),
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| 38 | remaining: toPositiveInteger(limit)
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| 39 | });
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| 40 | }
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| 41 | });
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