Xml.php

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<?php
namespace Magento\Analytics\ReportXml\Config\Converter;

use Magento\Framework\Config\ConverterInterface;

class Xml implements ConverterInterface
{
    private function convertNode(\DOMNode $source)
    {
        $result = [];
        if ($source->hasAttributes()) {
            $attrs = $source->attributes;
            foreach ($attrs as $attr) {
                $result[$attr->name] = $attr->value;
            }
        }
        if ($source->hasChildNodes()) {
            $children = $source->childNodes;
            if ($children->length == 1) {
                $child = $children->item(0);
                if ($child->nodeType == XML_TEXT_NODE) {
                    $result['_value'] = $child->nodeValue;
                    return count($result) == 1 ? $result['_value'] : $result;
                }
            }
            foreach ($children as $child) {
                if ($child instanceof \DOMCharacterData) {
                    continue;
                }
                $result[$child->nodeName][] = $this->convertNode($child);
            }
        }
        return $result;
    }

    public function convert($source)
    {
        return $this->convertNode($source);
    }
}