Page.php

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<?php
namespace Magento\Config\Model\Config\Source\Admin;

class Page implements \Magento\Framework\Option\ArrayInterface
{
    protected $_menu;

    protected $_iteratorFactory;

    public function __construct(
        \Magento\Backend\Model\Menu\Filter\IteratorFactory $iteratorFactory,
        \Magento\Backend\Model\Menu\Config $menuConfig
    ) {
        $this->_menu = $menuConfig->getMenu();
        $this->_iteratorFactory = $iteratorFactory;
    }

    public function toOptionArray()
    {
        $options = [];
        $this->_createOptions($options, $this->_menu);
        return $options;
    }

    protected function _getMenuIterator(\Magento\Backend\Model\Menu $menu)
    {
        return $this->_iteratorFactory->create(['iterator' => $menu->getIterator()]);
    }

    protected function _createOptions(&$optionArray, \Magento\Backend\Model\Menu $menu, $level = 0)
    {
        $nonEscapableNbspChar = html_entity_decode('&#160;', ENT_NOQUOTES, 'UTF-8');
        $paddingString = str_repeat($nonEscapableNbspChar, $level * 4);

        foreach ($this->_getMenuIterator($menu) as $menuItem) {
            if ($menuItem->getAction()) {
                $optionArray[] = [
                    'label' => $paddingString . $menuItem->getTitle(),
                    'value' => $menuItem->getId(),
                ];

                if ($menuItem->hasChildren()) {
                    $this->_createOptions($optionArray, $menuItem->getChildren(), $level + 1);
                }
            } else {
                $children = [];

                if ($menuItem->hasChildren()) {
                    $this->_createOptions($children, $menuItem->getChildren(), $level + 1);
                }

                $optionArray[] = ['label' => $paddingString . $menuItem->getTitle(), 'value' => $children];
            }
        }
    }
}