Converter.php

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<?php
namespace Magento\Sales\Model\Config;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    public function convert($source)
    {
        $output = [];
        if (!$source instanceof \DOMDocument) {
            return $output;
        }

        $sections = $source->getElementsByTagName('section');

        foreach ($sections as $section) {
            $sectionArray = [];
            $sectionName = $section->getAttribute('name');

            if (!$sectionName) {
                throw new \InvalidArgumentException('Attribute "name" of "section" does not exist');
            }

            $groups = $section->getElementsByTagName('group');
            foreach ($groups as $group) {
                $groupArray = [];
                $groupName = $group->getAttribute('name');
                if (!$groupName) {
                    throw new \InvalidArgumentException('Attribute "name" of "group" does not exist');
                }

                $items = $group->getElementsByTagName('item');
                foreach ($items as $item) {
                    $rendererArray = [];
                    $itemName = $item->getAttribute('name');
                    if (!$itemName) {
                        throw new \InvalidArgumentException('Attribute "name" of "item" does not exist');
                    }

                    $renderers = $item->getElementsByTagName('renderer');
                    foreach ($renderers as $renderer) {
                        $rendererName = $renderer->getAttribute('name');
                        if (!$rendererName) {
                            throw new \InvalidArgumentException('Attribute "name" of "renderer" does not exist');
                        }
                        $rendererArray[$rendererName] = $renderer->getAttribute('instance');
                    }

                    $itemArray = [
                        'instance' => $item->getAttribute('instance'),
                        'sort_order' => $item->getAttribute('sort_order'),
                        'renderers' => $rendererArray,
                    ];
                    $groupArray[$itemName] = $itemArray;
                }
                $sectionArray[$groupName] = $groupArray;
            }
            $output[$sectionName] = $sectionArray;
        }

        $order = $source->getElementsByTagName('order')->item(0);
        $availableProductTypes = [];
        if ($order) {
            $types = $order->getElementsByTagName('available_product_type');

            foreach ($types as $type) {
                $availableProductTypes[] = $type->getAttribute('name');
            }
            $output['order']['available_product_types'] = $availableProductTypes;
        }

        return $output;
    }
}