Structure.php

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<?php
namespace Magento\Framework\View\Layout\Data;

use Magento\Framework\Data\Structure as DataStructure;
use Magento\Framework\App\State;

class Structure extends DataStructure
{
    protected $_nameIncrement = [];

    protected $logger;

    protected $state;

    public function __construct(
        \Psr\Log\LoggerInterface $logger,
        State $state,
        array $elements = null
    ) {
        $this->logger = $logger;
        $this->state = $state;
        parent::__construct($elements);
    }

    public function createStructuralElement($name, $type, $class)
    {
        if (empty($name)) {
            $name = $this->_generateAnonymousName($class);
        }
        $this->createElement($name, ['type' => $type]);
        return $name;
    }

    protected function _generateAnonymousName($class)
    {
        $position = strpos($class, '\\Block\\');
        $key = $position !== false ? substr($class, $position + 7) : $class;
        $key = strtolower(trim($key, '_'));

        if (!isset($this->_nameIncrement[$key])) {
            $this->_nameIncrement[$key] = 0;
        }

        do {
            $name = $key . '_' . $this->_nameIncrement[$key]++;
        } while ($this->hasElement($name));

        return $name;
    }

    public function reorderChildElement($parentName, $childName, $offsetOrSibling, $after = true)
    {
        if (is_numeric($offsetOrSibling)) {
            $offset = (int)abs($offsetOrSibling) * ($after ? 1 : -1);
            $this->reorderChild($parentName, $childName, $offset);
        } elseif (null === $offsetOrSibling) {
            $this->reorderChild($parentName, $childName, null);
        } else {
            $children = array_keys($this->getChildren($parentName));
            if ($this->getChildId($parentName, $offsetOrSibling) !== false) {
                $offsetOrSibling = $this->getChildId($parentName, $offsetOrSibling);
            }
            $sibling = $this->_filterSearchMinus($offsetOrSibling, $children, $after);
            if ($childName !== $sibling) {
                $siblingParentName = $this->getParentId($sibling);
                if ($parentName !== $siblingParentName) {
                    if ($this->state->getMode() === State::MODE_DEVELOPER) {
                        $this->logger->info(
                            "Broken reference: the '{$childName}' tries to reorder itself towards '{$sibling}', but " .
                            "their parents are different: '{$parentName}' and '{$siblingParentName}' respectively."
                        );
                    }
                    return;
                }
                $this->reorderToSibling($parentName, $childName, $sibling, $after ? 1 : -1);
            }
        }
    }

    protected function _filterSearchMinus($needle, array $haystack, $isLast)
    {
        if ('-' === $needle) {
            if ($isLast) {
                return array_pop($haystack);
            }
            return array_shift($haystack);
        }
        return $needle;
    }
}