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✏️ Editing: custom-loader.php

<?php
/**
 * Yoast SEO Plugin File.
 *
 * @package Yoast\YoastSEO\Dependency_Injection
 */

namespace Yoast\WP\Free\Dependency_Injection;

use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
use Symfony\Component\Config\Resource\GlobResource;
use Symfony\Component\DependencyInjection\ChildDefinition;
use Symfony\Component\DependencyInjection\Definition;

/**
 * This class is mostly a direct copy-paste of the symfony PhpFileLoader class.
 * It's been adapted to allow automatic discovery based on not just PSR-4 but also the Yoast standards.
 */
class Custom_Loader extends PhpFileLoader {

/**
	 * Custom_Loader constructor.
	 *
	 * @param \Symfony\Component\DependencyInjection\ContainerBuilder $container The ContainerBuilder to load classes for.
	 */
	public function __construct( ContainerBuilder $container ) {
		parent::__construct( $container, new FileLocator( __DIR__ . '/../..' ) );
	}

/**
	 * Transforms a path to a class name using the class map.
	 *
	 * @param string $path The path of the class.
	 *
	 * @return bool|string The classname.
	 */
	private function getClassFromClassMap( $path ) {
		static $class_map;

if ( ! $class_map ) {
			$class_map = require __DIR__ . '/../../vendor/composer/autoload_classmap.php';
		}

foreach ( $class_map as $class => $class_path ) {
			if ( $path === $class_path ) {
				return $class;
			}
		}

return false;
	}

/**
	 * Registers a set of classes as services using PSR-4 for discovery.
	 *
	 * @param \Symfony\Component\DependencyInjection\Definition $prototype A definition to use as template.
	 * @param string                                            $namespace The namespace prefix of classes
	 *                                                                     in the scanned directory.
	 * @param string                                            $resource  The directory to look for classes,
	 *                                                                     glob-patterns allowed.
	 * @param string                                            $exclude   A globed path of files to exclude.
	 *
	 * @throws InvalidArgumentException If invalid arguments are supplied.
	 *
	 * @return void
	 */
	public function registerClasses( Definition $prototype, $namespace, $resource, $exclude = null ) {
		if ( '\\' !== \substr( $namespace, -1 ) ) {
			throw new InvalidArgumentException( \sprintf( 'Namespace prefix must end with a "\\": %s.', $namespace ) );
		}
		if ( ! \preg_match( '/^(?:[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+\\\\)++$/', $namespace ) ) {
			throw new InvalidArgumentException( \sprintf( 'Namespace is not a valid PSR-4 prefix: %s.', $namespace ) );
		}

$classes = $this->findClasses( $namespace, $resource, $exclude );
		// Prepare for deep cloning.
		$serialized_prototype = \serialize( $prototype );
		$interfaces           = [];
		$singly_implemented   = [];

foreach ( $classes as $class => $error_message ) {
			if ( \interface_exists( $class, false ) ) {
				$interfaces[] = $class;
			}
			else {
				$this->setDefinition( $class, $definition = \unserialize( $serialized_prototype ) );
				if ( null !== $error_message ) {
					$definition->addError( $error_message );

continue;
				}
				foreach ( \class_implements( $class, false ) as $interface ) {
					$singly_implemented[ $interface ] = isset( $singly_implemented[ $interface ] ) ? false : $class;
				}
			}
		}
		foreach ( $interfaces as $interface ) {
			if ( ! empty( $singly_implemented[ $interface ] ) ) {
				$this->container->setAlias( $interface, $singly_implemented[ $interface ] )
								->setPublic( false );
			}
		}
	}

/**
	 * Registers a definition in the container with its instanceof-conditionals.
	 *
	 * @param string                                            $id         The ID of the definition.
	 * @param \Symfony\Component\DependencyInjection\Definition $definition The definition.
	 *
	 * @throws InvalidArgumentException If invalid arguments were supplied.
	 *
	 * @return void
	 */
	protected function setDefinition( $id, Definition $definition ) {
		$this->container->removeBindings( $id );

// @codingStandardsIgnoreLine WordPress.NamingConventions.ValidVariableName.NotSnakeCaseMemberVar This is from an inherited class not abiding by that standard.
		if ( $this->isLoadingInstanceof ) {
			if ( ! $definition instanceof ChildDefinition ) {
				throw new InvalidArgumentException( \sprintf( 'Invalid type definition "%s": ChildDefinition expected, "%s" given.', $id, \get_class( $definition ) ) );
			}
			$this->instanceof[ $id ] = $definition;
		}
		else {
			$this->container->setDefinition( $id, ( $definition instanceof ChildDefinition ) ? $definition : $definition->setInstanceofConditionals( $this->instanceof ) );
		}
	}

/**
	 * Finds classes based on a given pattern and exclude pattern.
	 *
	 * @param string $namespace The namespace prefix of classes in the scanned directory.
	 * @param string $pattern   The directory to look for classes, glob-patterns allowed.
	 * @param string $exclude   A globed path of files to exclude.
	 *
	 * @throws InvalidArgumentException If invalid arguments were supplied.
	 *
	 * @return array The found classes.
	 */
	private function findClasses( $namespace, $pattern, $exclude ) {
		$parameter_bag = $this->container->getParameterBag();

$exclude_paths  = [];
		$exclude_prefix = null;
		if ( $exclude ) {
			$exclude = $parameter_bag->unescapeValue( $parameter_bag->resolveValue( $exclude ) );
			foreach ( $this->glob( $exclude, true, $resource ) as $path => $info ) {
				if ( null === $exclude_prefix ) {
					$exclude_prefix = $resource->getPrefix();
				}

// Normalize Windows slashes.
				$exclude_paths[ \str_replace( '\\', '/', $path ) ] = true;
			}
		}

$pattern    = $parameter_bag->unescapeValue( $parameter_bag->resolveValue( $pattern ) );
		$classes    = [];
		$ext_regexp = \defined( 'HHVM_VERSION' ) ? '/\\.(?:php|hh)$/' : '/\\.php$/';
		$prefix_len = null;
		foreach ( $this->glob( $pattern, true, $resource ) as $path => $info ) {
			if ( null === $prefix_len ) {
				$prefix_len = \strlen( $resource->getPrefix() );

if ( $exclude_prefix && 0 !== \strpos( $exclude_prefix, $resource->getPrefix() ) ) {
					throw new InvalidArgumentException( \sprintf( 'Invalid "exclude" pattern when importing classes for "%s": make sure your "exclude" pattern (%s) is a subset of the "resource" pattern (%s)', $namespace, $exclude, $pattern ) );
				}
			}

if ( isset( $exclude_paths[ \str_replace( '\\', '/', $path ) ] ) ) {
				continue;
			}

if ( ! \preg_match( $ext_regexp, $path, $m ) || ! $info->isReadable() ) {
				continue;
			}
			$class = $this->getClassFromClassMap( $path );

if ( ! $class || ! \preg_match( '/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+(?:\\\\[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+)*+$/', $class ) ) {
				continue;
			}

try {
				$r = $this->container->getReflectionClass( $class );
			} catch ( \ReflectionException $e ) {
				$classes[ $class ] = \sprintf(
					'While discovering services from namespace "%s", an error was thrown when processing the class "%s": "%s".',
					$namespace,
					$class,
					$e->getMessage()
				);
				continue;
			}
			// Check to make sure the expected class exists.
			if ( ! $r ) {
				throw new InvalidArgumentException( \sprintf( 'Expected to find class "%s" in file "%s" while importing services from resource "%s", but it was not found! Check the namespace prefix used with the resource.', $class, $path, $pattern ) );
			}

if ( $r->isInstantiable() || $r->isInterface() ) {
				$classes[ $class ] = null;
			}
		}

// Track only for new & removed files.
		if ( $resource instanceof GlobResource ) {
			$this->container->addResource( $resource );
		}
		else {
			foreach ( $resource as $path ) {
				$this->container->fileExists( $path, false );
			}
		}

return $classes;
	}
}

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Sid Gifari From Gifari Industries - BD Cyber Security Team