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49 lines
1.4 KiB
49 lines
1.4 KiB
1 week ago
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'use strict';
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var $TypeError = require('es-errors/type');
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var isObject = require('es-object-atoms/isObject');
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var AdvanceStringIndex = require('./AdvanceStringIndex');
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var Call = require('./Call');
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var GetIteratorDirect = require('./GetIteratorDirect');
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var GetMethod = require('./GetMethod');
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var IsArray = require('./IsArray');
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var getIteratorMethod = require('../helpers/getIteratorMethod');
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// https://262.ecma-international.org/16.0/#sec-getiteratorflattenable
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module.exports = function GetIteratorFlattenable(obj, primitiveHandling) {
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if (primitiveHandling !== 'REJECT-PRIMITIVES' && primitiveHandling !== 'ITERATE-STRING-PRIMITIVES') {
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throw new $TypeError('Assertion failed: `stringHandling` must be "REJECT-PRIMITIVES" or "ITERATE-STRING-PRIMITIVES"');
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}
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if (!isObject(obj)) {
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if (primitiveHandling === 'REJECT-PRIMITIVES' || typeof obj !== 'string') {
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throw new $TypeError('obj must be an Object'); // step 1.a
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}
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}
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// var method = GetMethod(obj, Symbol.iterator); // step 2
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var method = getIteratorMethod(
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{
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AdvanceStringIndex: AdvanceStringIndex,
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GetMethod: GetMethod,
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IsArray: IsArray
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},
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obj
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);
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var iterator;
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if (typeof method === 'undefined') { // step 3
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iterator = obj; // step 3.a
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} else { // step 4
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iterator = Call(method, obj); // step 4.a
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}
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if (!isObject(iterator)) {
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throw new $TypeError('iterator must be an Object'); // step 5
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}
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return GetIteratorDirect(iterator); // step 6
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};
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