src/AppBundle/DependencyInjection/Compiler/ExtensionPass.php

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<?php

namespace AppBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\Reference;

class ExtensionPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        if (!$container->has('extension.manager')) {
            return;
        }

        $managerDefinition = $container->findDefinition('extension.manager');
        $collectorDefinition = $container->findDefinition('biz.service_provider.collector');

        $taggedServices = $this->findSortTaggedServiceIds($container);
        foreach ($taggedServices as $id => $tags) {
            $def = $container->getDefinition($id);
            if (is_subclass_of($def->getClass(), 'Pimple\ServiceProviderInterface')) {
                $collectorDefinition->addMethodCall('add', array(new Reference($id)));
            }

            $managerDefinition->addMethodCall('addExtension', array(new Reference($id)));
        }
    }

    /**
     * sort  service by priority asc
     *
     * @param ContainerBuilder $container
     *
     * @return array
     */
    protected function findSortTaggedServiceIds(ContainerBuilder $container)
    {
        $taggedServices = $container->findTaggedServiceIds('extension');
        ksort($taggedServices);

        return $taggedServices;
    }
}