'use strict';
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var $ = require('../internals/export');
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var call = require('../internals/function-call');
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var aCallable = require('../internals/a-callable');
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var anObject = require('../internals/an-object');
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var getIteratorMethod = require('../internals/get-iterator-method');
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var createIteratorProxy = require('../internals/iterator-create-proxy');
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var createIterResultObject = require('../internals/create-iter-result-object');
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var $Array = Array;
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var IteratorProxy = createIteratorProxy(function () {
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while (true) {
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var iterator = this.iterator;
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if (!iterator) {
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var iterableIndex = this.nextIterableIndex++;
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var iterables = this.iterables;
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if (iterableIndex >= iterables.length) {
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this.done = true;
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return createIterResultObject(undefined, true);
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}
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var entry = iterables[iterableIndex];
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this.iterables[iterableIndex] = null;
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iterator = this.iterator = call(entry.method, entry.iterable);
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this.next = iterator.next;
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}
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var result = anObject(call(this.next, iterator));
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if (result.done) {
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this.iterator = null;
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this.next = null;
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continue;
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}
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return result;
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}
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}, false, true);
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// `Iterator.concat` method
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// https://github.com/tc39/proposal-iterator-sequencing
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$({ target: 'Iterator', stat: true, forced: true }, {
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concat: function concat() {
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var length = arguments.length;
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var iterables = $Array(length);
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for (var index = 0; index < length; index++) {
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var item = anObject(arguments[index]);
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iterables[index] = {
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iterable: item,
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method: aCallable(getIteratorMethod(item))
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};
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}
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return new IteratorProxy({
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iterables: iterables,
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nextIterableIndex: 0,
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iterator: null,
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next: null
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});
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}
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});
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