Iterator.php

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<?php
namespace Magento\Config\Model\Config\Structure\Element;

class Iterator implements \Iterator
{
    protected $_elements;

    protected $_flyweight;

    protected $_scope;

    protected $_lastId;

    public function __construct(\Magento\Config\Model\Config\Structure\AbstractElement $element)
    {
        $this->_flyweight = $element;
    }

    public function setElements(array $elements, $scope)
    {
        $this->_elements = $elements;
        $this->_scope = $scope;
        if (count($elements)) {
            $lastElement = end($elements);
            $this->_lastId = $lastElement['id'];
        }
    }

    public function current()
    {
        return $this->_flyweight;
    }

    public function next()
    {
        next($this->_elements);
        if (current($this->_elements)) {
            $this->_initFlyweight(current($this->_elements));
            if (!$this->current()->isVisible()) {
                $this->next();
            }
        }
    }

    protected function _initFlyweight(array $element)
    {
        $this->_flyweight->setData($element, $this->_scope);
    }

    public function key()
    {
        key($this->_elements);
    }

    public function valid()
    {
        return (bool)current($this->_elements);
    }

    public function rewind()
    {
        reset($this->_elements);
        if (current($this->_elements)) {
            $this->_initFlyweight(current($this->_elements));
            if (!$this->current()->isVisible()) {
                $this->next();
            }
        }
    }

    public function isLast(\Magento\Config\Model\Config\Structure\ElementInterface $element)
    {
        return $element->getId() == $this->_lastId;
    }
}