XmlInterceptorScanner.php

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

class XmlInterceptorScanner implements ScannerInterface
{
    public function collectEntities(array $files)
    {
        $output = [];
        foreach ($files as $file) {
            $output = array_merge($output, $this->_collectEntitiesFromString(file_get_contents($file)));
        }
        $output = array_unique($output);
        $output = $this->_filterEntities($output);
        return $output;
    }

    protected function _collectEntitiesFromString($content)
    {
        $output = [];
        $dom = new \DOMDocument();
        $dom->loadXML($content);
        $xpath = new \DOMXPath($dom);
        foreach ($xpath->query('//type[plugin]|//virtualType[plugin]') as $entityNode) {
            $attributes = $entityNode->attributes;
            $type = $attributes->getNamedItem('type');
            if ($type !== null) {
                $output[] = $type->nodeValue;
            } else {
                $output[] = $attributes->getNamedItem('name')->nodeValue;
            }
        }
        return $output;
    }

    protected function _filterEntities(array $output)
    {
        $filteredEntities = [];
        foreach ($output as $entityName) {
            // @todo the controller handling logic below must be removed when controllers become PSR-0 compliant
            $controllerSuffix = 'Controller';
            $pathParts = explode('_', $entityName);
            if (strrpos(
                $entityName,
                $controllerSuffix
            ) === strlen(
                $entityName
            ) - strlen(
                $controllerSuffix
            ) && isset(
                $pathParts[2]
            ) && !in_array(
                $pathParts[2],
                ['Block', 'Helper', 'Model']
            )
            ) {
                $this->_handleControllerClassName($entityName);
            }
            if (class_exists($entityName) || interface_exists($entityName)) {
                $filteredEntities[] = $entityName . '\\Interceptor';
            }
        }
        return $filteredEntities;
    }

    protected function _handleControllerClassName($className)
    {
        if (!class_exists($className)) {
            $className = preg_replace('/[^a-zA-Z0-9_]/', '', $className);
            $className = preg_replace('/^([0-9A-Za-z]*)_([0-9A-Za-z]*)/', '\\1_\\2_controllers', $className);
            $filePath = stream_resolve_include_path(str_replace('_', '/', $className) . '.php');
            if (file_exists($filePath)) {
                require_once $filePath;
            }
        }
    }
}