Parser.php

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

use Magento\Framework\Config\Converter\Dom\Flat as FlatConverter;
use Magento\Framework\Config\Dom\ArrayNodeConfig;
use Magento\Framework\Config\Dom\NodePathMatcher;

class Parser
{
    private $converter;

    public function parse(\DOMNode $argumentNode)
    {
        // Base path is specified to use more meaningful XPaths in config
        return $this->getConverter()->convert($argumentNode, 'argument');
    }

    protected function getConverter()
    {
        if (!$this->converter) {
            $arrayNodeConfig = new ArrayNodeConfig(
                new NodePathMatcher(),
                [
                    'argument/param' => 'name',
                    'argument(/item)+' => 'name',
                    'argument(/item)+/param' => 'name',
                    'argument(/argument)+' => 'name',
                    'argument((/argument)+(/item)+)+' => 'name',
                    'argument((/argument)+(/item)+)+/param' => 'name'
                ],
                ['argument/updater']
            );
            $this->converter = new FlatConverter($arrayNodeConfig);
        }
        return $this->converter;
    }
}