50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
'use strict';
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var $TypeError = require('es-errors/type');
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var Get = require('./Get');
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var IteratorComplete = require('./IteratorComplete');
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var IteratorNext = require('./IteratorNext');
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var isIteratorRecord = require('../helpers/records/iterator-record');
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// https://262.ecma-international.org/15.0/#sec-iteratorstepvalue
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module.exports = function IteratorStepValue(iteratorRecord) {
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if (!isIteratorRecord(iteratorRecord)) {
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throw new $TypeError('Assertion failed: `iteratorRecord` must be an Iterator Record');
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}
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/* eslint no-param-reassign: 0 */
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var result;
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try {
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result = IteratorNext(iteratorRecord); // step 1
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} catch (e) { // step 2
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iteratorRecord['[[Done]]'] = true; // step 2.a
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throw e; // step 2.b
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}
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var done;
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try {
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done = IteratorComplete(result); // step 4
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} catch (e) { // step 5
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iteratorRecord['[[Done]]'] = true; // step 5.a
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throw e; // step 5.b
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}
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if (done) { // step 7
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iteratorRecord['[[Done]]'] = true; // step 7.a
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return 'DONE'; // step 7.b
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}
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var value;
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try {
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value = Get(result, 'value'); // step 8
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} catch (e) { // step 9
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iteratorRecord['[[Done]]'] = true; // step 9.a
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throw e; // step 10
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}
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return value; // step 10
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};
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