Nette\DI\ContainerBuilder::getDefinition PHP Method

    public function getDefinition($name)
    {
        $service = isset($this->aliases[$name]) ? $this->aliases[$name] : $name;
        if (!isset($this->definitions[$service])) {
            throw new MissingServiceException("Service '{$name}' not found.");
        }
        return $this->definitions[$service];
    }

 /**
  * Generates body of service method.
  * @return string
  */
 private function generateService($name)
 {
     $def = $this->builder->getDefinition($name);
     if ($def->isDynamic()) {
         return PhpHelpers::formatArgs('throw new Nette\\DI\\ServiceCreationException(?);', ["Unable to create dynamic service '{$name}', it must be added using addService()"]);
     }
     $entity = $def->getFactory()->getEntity();
     $serviceRef = $this->builder->getServiceName($entity);
     $factory = $serviceRef && !$def->getFactory()->arguments && !$def->getSetup() && $def->getImplementMode() !== $def::IMPLEMENT_MODE_CREATE ? new Statement(['@' . ContainerBuilder::THIS_CONTAINER, 'getService'], [$serviceRef]) : $def->getFactory();
     $this->currentService = NULL;
     $code = '$service = ' . $this->formatStatement($factory) . ";\n";
     if (($class = $def->getClass()) && !$serviceRef && $class !== $entity && !(is_string($entity) && preg_match('#^[\\w\\\\]+\\z#', $entity) && is_subclass_of($entity, $class))) {
         $code .= PhpHelpers::formatArgs("if (!\$service instanceof {$class}) {\n" . "\tthrow new Nette\\UnexpectedValueException(?);\n}\n", ["Unable to create service '{$name}', value returned by factory is not {$class} type."]);
     }
     $this->currentService = $name;
     foreach ($def->getSetup() as $setup) {
         $code .= $this->formatStatement($setup) . ";\n";
     }
     $code .= 'return $service;';
     if (!$def->getImplement()) {
         return $code;
     }
     $factoryClass = new Nette\PhpGenerator\ClassType();
     $factoryClass->setName('($this)')->addImplement($def->getImplement());
     $factoryClass->addProperty('container')->setVisibility('private');
     $factoryClass->addMethod('__construct')->addBody('$this->container = $container;')->addParameter('container')->setTypeHint($this->className);
     $factoryClass->addMethod($def->getImplementMode())->setParameters($this->convertParameters($def->parameters))->setBody(str_replace('$this', '$this->container', $code))->setReturnType(PHP_VERSION_ID >= 70000 ? $def->getClass() : NULL);
     if (PHP_VERSION_ID < 70000) {
         $this->generatedClasses[] = $factoryClass;
         $factoryClass->setName(str_replace(['\\', '.'], '_', "{$this->className}_{$def->getImplement()}Impl_{$name}"));
         return "return new {$factoryClass->getName()}(\$this);";
     }
     return 'return new ' . rtrim($factoryClass) . ';';
 }