Flat.php

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<?php
namespace Magento\Framework\Config\Converter\Dom;

use Magento\Framework\Config\Dom\ArrayNodeConfig;

class Flat
{
    protected $arrayNodeConfig;

    public function __construct(ArrayNodeConfig $arrayNodeConfig)
    {
        $this->arrayNodeConfig = $arrayNodeConfig;
    }

    public function convert(\DOMNode $source, $basePath = '')
    {
        $value = [];
        foreach ($source->childNodes as $node) {
            if ($node->nodeType == XML_ELEMENT_NODE) {
                $nodeName = $node->nodeName;
                $nodePath = $basePath . '/' . $nodeName;

                $arrayKeyAttribute = $this->arrayNodeConfig->getAssocArrayKeyAttribute($nodePath);
                $isNumericArrayNode = $this->arrayNodeConfig->isNumericArray($nodePath);
                $isArrayNode = $isNumericArrayNode || $arrayKeyAttribute;

                if (isset($value[$nodeName]) && !$isArrayNode) {
                    throw new \UnexpectedValueException(
                        "Node path '{$nodePath}' is not unique, but it has not been marked as array."
                    );
                }

                $nodeData = $this->convert($node, $nodePath);

                if ($isArrayNode) {
                    if ($isNumericArrayNode) {
                        $value[$nodeName][] = $nodeData;
                    } elseif (isset($nodeData[$arrayKeyAttribute])) {
                        $arrayKeyValue = $nodeData[$arrayKeyAttribute];
                        $value[$nodeName][$arrayKeyValue] = $nodeData;
                    } else {
                        throw new \UnexpectedValueException(
                            "Array is expected to contain value for key '{$arrayKeyAttribute}'."
                        );
                    }
                } else {
                    $value[$nodeName] = $nodeData;
                }
            } elseif ($node->nodeType == XML_CDATA_SECTION_NODE
                || ($node->nodeType == XML_TEXT_NODE && trim($node->nodeValue) != '')
            ) {
                $value = $node->nodeValue;
                break;
            }
        }
        $result = $this->getNodeAttributes($source);
        if (is_array($value)) {
            $result = array_merge($result, $value);
            if (!$result) {
                $result = '';
            }
        } else {
            if ($result) {
                $result['value'] = trim($value);
            } else {
                $result = trim($value);
            }
        }
        return $result;
    }

    protected function getNodeAttributes(\DOMNode $node)
    {
        $result = [];
        $attributes = $node->attributes ?: [];
        foreach ($attributes as $attribute) {
            if ($attribute->nodeType == XML_ATTRIBUTE_NODE) {
                $result[$attribute->nodeName] = $attribute->nodeValue;
            }
        }
        return $result;
    }
}