class ReplaceAliasByActualDefinitionPass

class ReplaceAliasByActualDefinitionPass extends AbstractRecursivePass {
    protected bool $skipScalars = true;
    private array $replacements;
    
    /**
     * Process the Container to replace aliases with service definitions.
     *
     * @throws InvalidArgumentException if the service definition does not exist
     */
    public function process(ContainerBuilder $container) : void {
        // First collect all alias targets that need to be replaced
        $seenAliasTargets = [];
        $replacements = [];
        foreach ($container->getAliases() as $definitionId => $target) {
            $targetId = (string) $target;
            // Special case: leave this target alone
            if ('service_container' === $targetId) {
                continue;
            }
            // Check if target needs to be replaced
            if (isset($replacements[$targetId])) {
                $container->setAlias($definitionId, $replacements[$targetId])
                    ->setPublic($target->isPublic());
                if ($target->isDeprecated()) {
                    $container->getAlias($definitionId)
                        ->setDeprecated(...array_values($target->getDeprecation('%alias_id%')));
                }
            }
            // No need to process the same target twice
            if (isset($seenAliasTargets[$targetId])) {
                continue;
            }
            // Process new target
            $seenAliasTargets[$targetId] = true;
            try {
                $definition = $container->getDefinition($targetId);
            } catch (ServiceNotFoundException $e) {
                if ('' !== $e->getId() && '@' === $e->getId()[0]) {
                    throw new ServiceNotFoundException($e->getId(), $e->getSourceId(), null, [
                        substr($e->getId(), 1),
                    ]);
                }
                throw $e;
            }
            if ($definition->isPublic()) {
                continue;
            }
            // Remove private definition and schedule for replacement
            $definition->setPublic($target->isPublic());
            $container->setDefinition($definitionId, $definition);
            $container->removeDefinition($targetId);
            $replacements[$targetId] = $definitionId;
            if ($target->isPublic() && $target->isDeprecated()) {
                $definition->addTag('container.private', $target->getDeprecation('%service_id%'));
            }
        }
        $this->replacements = $replacements;
        parent::process($container);
        $this->replacements = [];
    }
    protected function processValue(mixed $value, bool $isRoot = false) : mixed {
        if ($value instanceof Reference && isset($this->replacements[$referenceId = (string) $value])) {
            // Perform the replacement
            $newId = $this->replacements[$referenceId];
            $value = new Reference($newId, $value->getInvalidBehavior());
            $this->container
                ->log($this, \sprintf('Changed reference of service "%s" previously pointing to "%s" to "%s".', $this->currentId, $referenceId, $newId));
        }
        return parent::processValue($value, $isRoot);
    }

}