Definition.php

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<?php
namespace Magento\Ui\Config\Reader;

use Magento\Framework\Config\Dom\ValidationException;
use Magento\Framework\Config\ReaderInterface;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;

class Definition extends \Magento\Framework\Config\Reader\Filesystem implements ReaderInterface
{
    public function read($scope = null)
    {
        $scope = $scope ?: $this->_defaultScope;
        $fileList = $this->_fileResolver->get($this->_fileName, $scope);
        if (!count($fileList)) {
            return [];
        }
        $output = $this->readFiles($fileList);

        return $output;
    }

    private function readFiles($fileList)
    {
        $configMerger = null;
        foreach ($fileList as $key => $content) {
            try {
                if (!$configMerger) {
                    $configMerger = $this->_createConfigMerger($this->_domDocumentClass, $content);
                } else {
                    $configMerger->merge($content);
                }
            } catch (ValidationException $e) {
                throw new LocalizedException(
                    new Phrase(
                        'The XML in file "%1" is invalid.' . "\n%2\nVerify the XML and try again.",
                        [$key, $e->getMessage()]
                    )
                );
            }
        }
        if ($this->validationState->isValidationRequired()) {
            $errors = [];
            if ($configMerger && !$configMerger->validate($this->_schemaFile, $errors)) {
                $message = "Invalid Document \n";
                throw new LocalizedException(
                    new Phrase($message . implode("\n", $errors))
                );
            }
        }

        $output = [];
        if ($configMerger) {
            $output = $this->_converter->convert($configMerger->getDom()->documentElement);
        }
        return $output;
    }
}