ShortcodeCompilerPass.php

<?php
namespace App;

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;

class ShortcodesPass extends BaseKernel implements CompilerPassInterface {
  
    public function process(ContainerBuilder $container)
        if (!$container->has('App\Shortcode\ShortcodeService')) {
            return;
        }
        // get the ShortcodeService
        $definition = $container->findDefinition('App\Shortcode\ShortcodeService');
        // find all the services with tag lac.shortcode
        $taggedServices = $container->findTaggedServiceIds('lac.shortcode');
        foreach ($taggedServices as $id => $tags) {
            // call method addShortcode of App\Shortcode\ShortcodeService with the tagged services
            $definition->addMethodCall('addShortcode', array(new Reference($id)));
        }
    }
}