ConfigurableObjectType.php

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<?php
namespace Magento\Ui\Config\Argument\Parser;

use Magento\Ui\Config\Argument\ParserInterface;

class ConfigurableObjectType implements ParserInterface
{
    private $argumentParser;

    public function __construct(ParserInterface $argumentParser)
    {
        $this->argumentParser = $argumentParser;
    }

    public function parse(array $data, \DOMNode $node)
    {
        $arguments = isset($data['argument']) ? $data['argument'] : [];
        if (!is_array($arguments)) {
            throw new \InvalidArgumentException('Array arguments are expected.');
        }
        $result = [];
        foreach ($arguments as $argumentKey => $argumentData) {
            $parserResult = $this->argumentParser->parse($argumentData, $node);
            if ($parserResult) {
                $result[$argumentKey] = $parserResult;
            }
        }

        if ($result) {
            $data['argument'] = $result;
            return $data;
        } else {
            return $result;
        }
    }
}