GenerateProxyClassCommand.php

<?php

namespace Drupal\Core\Command;

use Drupal\Component\ProxyBuilder\ProxyBuilder;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * Provides a console command to generate proxy classes.
 *
 * @see lazy_services
 * @see core/scripts/generate-proxy.sh
 */
class GenerateProxyClassCommand extends Command {

  /**
   * The proxy builder.
   *
   * @var \Drupal\Component\ProxyBuilder\ProxyBuilder
   */
  protected $proxyBuilder;

  /**
   * Constructs a new GenerateProxyClassCommand instance.
   *
   * @param \Drupal\Component\ProxyBuilder\ProxyBuilder $proxy_builder
   *   The proxy builder.
   */
  public function __construct(ProxyBuilder $proxy_builder) {
    parent::__construct();
    $this->proxyBuilder = $proxy_builder;
  }

  /**
   * {@inheritdoc}
   */
  protected function configure() {
    $this
      ->setName('generate-proxy-class')
      ->setDefinition([
      new InputArgument('class_name', InputArgument::REQUIRED, 'The class to be proxied'),
      new InputArgument('namespace_root_path', InputArgument::REQUIRED, 'The filepath to the root of the namespace.'),
    ])
      ->setDescription('Dumps a generated proxy class into its appropriate namespace.')
      ->addUsage('\'Drupal\\Core\\Batch\\BatchStorage\' "core/lib/Drupal/Core"')
      ->addUsage('\'Drupal\\block\\BlockRepository\' "core/modules/block/src"')
      ->addUsage('\'Drupal\\my_module\\MyClass\' "modules/contrib/my_module/src"');
  }

  /**
   * {@inheritdoc}
   */
  protected function execute(InputInterface $input, OutputInterface $output) : int {
    $class_name = ltrim($input
      ->getArgument('class_name'), '\\');
    $namespace_root = $input
      ->getArgument('namespace_root_path');
    $match = [];
    preg_match('/([a-zA-Z0-9_]+\\\\[a-zA-Z0-9_]+)\\\\(.+)/', $class_name, $match);
    if ($match) {
      $root_namespace = $match[1];
      $rest_fqcn = $match[2];
      $proxy_filename = $namespace_root . '/ProxyClass/' . str_replace('\\', '/', $rest_fqcn) . '.php';
      $proxy_class_name = $root_namespace . '\\ProxyClass\\' . $rest_fqcn;
      $proxy_class_string = $this->proxyBuilder
        ->build($class_name);
      $file_string = <<<EOF
<?php
// phpcs:ignoreFile

/**
 * This file was generated via php core/scripts/generate-proxy-class.php '{<span class="php-variable">$class_name</span>}' "{<span class="php-variable">$namespace_root</span>}".
 */
{{ proxy_class_string }}
EOF;
      $file_string = str_replace([
        '{{ proxy_class_name }}',
        '{{ proxy_class_string }}',
      ], [
        $proxy_class_name,
        $proxy_class_string,
      ], $file_string);
      mkdir(dirname($proxy_filename), 0775, TRUE);
      file_put_contents($proxy_filename, $file_string);
      $output
        ->writeln(sprintf('Proxy of class %s written to %s', $class_name, $proxy_filename));
    }
    return 0;
  }

}