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node_modules/es-abstract/helpers/getIteratorMethod.js
| 45 lines
| 1.1 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var hasSymbols = require('has-symbols')(); | ||||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var callBound = require('./callBound'); | ||||
| var $iterator = GetIntrinsic('%Symbol.iterator%', true); | ||||
| var $stringSlice = callBound('String.prototype.slice'); | ||||
| module.exports = function getIteratorMethod(ES, iterable) { | ||||
| var usingIterator; | ||||
| if (hasSymbols) { | ||||
| usingIterator = ES.GetMethod(iterable, $iterator); | ||||
| } else if (ES.IsArray(iterable)) { | ||||
| usingIterator = function () { | ||||
| var i = -1; | ||||
| var arr = this; // eslint-disable-line no-invalid-this | ||||
| return { | ||||
| next: function () { | ||||
| i += 1; | ||||
| return { | ||||
| done: i >= arr.length, | ||||
| value: arr[i] | ||||
| }; | ||||
| } | ||||
| }; | ||||
| }; | ||||
| } else if (ES.Type(iterable) === 'String') { | ||||
| usingIterator = function () { | ||||
| var i = 0; | ||||
| return { | ||||
| next: function () { | ||||
| var nextIndex = ES.AdvanceStringIndex(iterable, i, true); | ||||
| var value = $stringSlice(iterable, i, nextIndex); | ||||
| i = nextIndex; | ||||
| return { | ||||
| done: nextIndex > iterable.length, | ||||
| value: value | ||||
| }; | ||||
| } | ||||
| }; | ||||
| }; | ||||
| } | ||||
| return usingIterator; | ||||
| }; | ||||