57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var callBound = require('../helpers/callBound');
|
||
|
|
var $arrayPush = callBound('Array.prototype.push');
|
||
|
|
|
||
|
|
var getIteratorMethod = require('../helpers/getIteratorMethod');
|
||
|
|
var AdvanceStringIndex = require('./AdvanceStringIndex');
|
||
|
|
var GetIterator = require('./GetIterator');
|
||
|
|
var GetMethod = require('./GetMethod');
|
||
|
|
var IsArray = require('./IsArray');
|
||
|
|
var IteratorStep = require('./IteratorStep');
|
||
|
|
var IteratorValue = require('./IteratorValue');
|
||
|
|
var ToObject = require('./ToObject');
|
||
|
|
var Type = require('./Type');
|
||
|
|
var ES = {
|
||
|
|
AdvanceStringIndex: AdvanceStringIndex,
|
||
|
|
GetMethod: GetMethod,
|
||
|
|
IsArray: IsArray,
|
||
|
|
Type: Type
|
||
|
|
};
|
||
|
|
|
||
|
|
// https://www.ecma-international.org/ecma-262/7.0/#sec-iterabletoarraylike
|
||
|
|
/**
|
||
|
|
* 1. Let usingIterator be ? GetMethod(items, @@iterator).
|
||
|
|
* 2. If usingIterator is not undefined, then
|
||
|
|
* 1. Let iterator be ? GetIterator(items, usingIterator).
|
||
|
|
* 2. Let values be a new empty List.
|
||
|
|
* 3. Let next be true.
|
||
|
|
* 4. Repeat, while next is not false
|
||
|
|
* 1. Let next be ? IteratorStep(iterator).
|
||
|
|
* 2. If next is not false, then
|
||
|
|
* 1. Let nextValue be ? IteratorValue(next).
|
||
|
|
* 2. Append nextValue to the end of the List values.
|
||
|
|
* 5. Return CreateArrayFromList(values).
|
||
|
|
* 3. NOTE: items is not an Iterable so assume it is already an array-like object.
|
||
|
|
* 4. Return ! ToObject(items).
|
||
|
|
*/
|
||
|
|
|
||
|
|
module.exports = function IterableToArrayLike(items) {
|
||
|
|
var usingIterator = getIteratorMethod(ES, items);
|
||
|
|
if (typeof usingIterator !== 'undefined') {
|
||
|
|
var iterator = GetIterator(items, usingIterator);
|
||
|
|
var values = [];
|
||
|
|
var next = true;
|
||
|
|
while (next) {
|
||
|
|
next = IteratorStep(iterator);
|
||
|
|
if (next) {
|
||
|
|
var nextValue = IteratorValue(next);
|
||
|
|
$arrayPush(values, nextValue);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return values;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ToObject(items);
|
||
|
|
};
|