PluginScanner.php

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<?php
namespace Magento\Setup\Module\Di\Code\Scanner;

class PluginScanner implements ScannerInterface
{
    public function collectEntities(array $files)
    {
        $pluginClassNames = [];
        foreach ($files as $fileName) {
            $dom = new \DOMDocument();
            $dom->loadXML(file_get_contents($fileName));
            $xpath = new \DOMXPath($dom);
            foreach ($xpath->query('//type/plugin|//virtualType/plugin') as $node) {
                $pluginTypeNode = $node->attributes->getNamedItem('type');
                if ($pluginTypeNode !== null) {
                    $pluginClassNames[] = $pluginTypeNode->nodeValue;
                }
            }
        }
        return $pluginClassNames;
    }
}