Neos\Flow\Mvc\Routing\Route::parse PHP Method

    public function parse()
    {
        if ($this->isParsed || $this->uriPattern === null || $this->uriPattern === '') {
            return;
        }
        $this->routeParts = [];
        $currentRoutePartIsOptional = false;
        if (substr($this->uriPattern, -1) === '/') {
            throw new InvalidUriPatternException('The URI pattern "' . $this->uriPattern . '" of route "' . $this->getName() . '" ends with a slash, which is not allowed. You can put the trailing slash in brackets to make it optional.', 1234782997);
        }
        if ($this->uriPattern[0] === '/') {
            throw new InvalidUriPatternException('The URI pattern "' . $this->uriPattern . '" of route "' . $this->getName() . '" starts with a slash, which is not allowed.', 1234782983);
        }
        $matches = [];
        preg_match_all(self::PATTERN_EXTRACTROUTEPARTS, $this->uriPattern, $matches, PREG_SET_ORDER);
        /** @var $lastRoutePart RoutePartInterface */
        $lastRoutePart = null;
        foreach ($matches as $match) {
            $routePartType = empty($match['dynamic']) ? self::ROUTEPART_TYPE_STATIC : self::ROUTEPART_TYPE_DYNAMIC;
            $routePartName = $match['content'];
            if (!empty($match['optionalStart'])) {
                if ($lastRoutePart !== null && $lastRoutePart->isOptional()) {
                    throw new InvalidUriPatternException('the URI pattern "' . $this->uriPattern . '" of route "' . $this->getName() . '" contains successive optional Route sections, which is not allowed.', 1234562050);
                }
                $currentRoutePartIsOptional = true;
            }
            $routePart = null;
            switch ($routePartType) {
                case self::ROUTEPART_TYPE_DYNAMIC:
                    if ($lastRoutePart instanceof DynamicRoutePartInterface) {
                        throw new InvalidUriPatternException('the URI pattern "' . $this->uriPattern . '" of route "' . $this->getName() . '" contains successive Dynamic Route Parts, which is not allowed.', 1218446975);
                    }
                    if (isset($this->routePartsConfiguration[$routePartName]['handler'])) {
                        $routePart = $this->objectManager->get($this->routePartsConfiguration[$routePartName]['handler']);
                        if (!$routePart instanceof DynamicRoutePartInterface) {
                            throw new InvalidRoutePartHandlerException(sprintf('routePart handlers must implement "%s" in route "%s"', DynamicRoutePartInterface::class, $this->getName()), 1218480972);
                        }
                    } elseif (isset($this->routePartsConfiguration[$routePartName]['objectType'])) {
                        $routePart = new IdentityRoutePart();
                        $routePart->setObjectType($this->routePartsConfiguration[$routePartName]['objectType']);
                        if (isset($this->routePartsConfiguration[$routePartName]['uriPattern'])) {
                            $routePart->setUriPattern($this->routePartsConfiguration[$routePartName]['uriPattern']);
                        }
                    } else {
                        $routePart = new DynamicRoutePart();
                    }
                    $routePartDefaultValue = ObjectAccess::getPropertyPath($this->defaults, $routePartName);
                    if ($routePartDefaultValue !== null) {
                        $routePart->setDefaultValue($routePartDefaultValue);
                    }
                    break;
                case self::ROUTEPART_TYPE_STATIC:
                    $routePart = new StaticRoutePart();
                    if ($lastRoutePart !== null && $lastRoutePart instanceof DynamicRoutePartInterface) {
                        /** @var DynamicRoutePartInterface $lastRoutePart */
                        $lastRoutePart->setSplitString($routePartName);
                    }
            }
            $routePart->setName($routePartName);
            if ($currentRoutePartIsOptional) {
                $routePart->setOptional(true);
                if ($routePart instanceof DynamicRoutePartInterface && !$routePart->hasDefaultValue()) {
                    throw new InvalidRouteSetupException(sprintf('There is no default value specified for the optional route part "{%s}" of route "%s", but all dynamic optional route parts need a default.', $routePartName, $this->getName()), 1477140679);
                }
            }
            $routePart->setLowerCase($this->lowerCase);
            if (isset($this->routePartsConfiguration[$routePartName]['options'])) {
                $routePart->setOptions($this->routePartsConfiguration[$routePartName]['options']);
            }
            if (isset($this->routePartsConfiguration[$routePartName]['toLowerCase'])) {
                $routePart->setLowerCase($this->routePartsConfiguration[$routePartName]['toLowerCase']);
            }
            $this->routeParts[] = $routePart;
            if (!empty($match['optionalEnd'])) {
                if (!$currentRoutePartIsOptional) {
                    throw new InvalidUriPatternException('The URI pattern "' . $this->uriPattern . '" of route "' . $this->getName() . '" contains an unopened optional section.', 1234564495);
                }
                $currentRoutePartIsOptional = false;
            }
            $lastRoutePart = $routePart;
        }
        if ($currentRoutePartIsOptional) {
            throw new InvalidUriPatternException('The URI pattern "' . $this->uriPattern . '" of route "' . $this->getName() . '" contains an unterminated optional section.', 1234563922);
        }
        $this->isParsed = true;
    }

 /**
  * @test
  */
 public function parseSetsDefaultValueOfRoutePartsRecursively()
 {
     $this->route->setUriPattern('{foo.bar}');
     $this->route->setRoutePartsConfiguration(['foo.bar' => ['handler' => 'SomeRoutePartHandler']]);
     $this->route->setDefaults(['foo' => ['bar' => 'SomeDefaultValue']]);
     $mockRoutePartHandler = $this->createMock(Routing\DynamicRoutePartInterface::class);
     $mockRoutePartHandler->expects($this->once())->method('setDefaultValue')->with('SomeDefaultValue');
     $this->mockObjectManager->expects($this->once())->method('get')->with('SomeRoutePartHandler')->will($this->returnValue($mockRoutePartHandler));
     $this->route->parse();
 }