Zephir\Compiler::checkDirectory PHP Method

    protected function checkDirectory()
    {
        $namespace = $this->config->get('namespace');
        if (!$namespace) {
            throw new Exception("Extension namespace cannot be loaded");
        }
        if (!is_string($namespace)) {
            throw new Exception("Extension namespace is invalid");
        }
        if (!$this->fileSystem->isInitialized()) {
            $this->fileSystem->initialize();
        }
        $version = self::getCurrentVersion();
        if (!$this->fileSystem->exists($version)) {
            if (!$this->checkIfPhpized()) {
                $this->logger->output('Zephir version has changed, use "zephir fullclean" to perform a full clean of the project');
            }
            $this->fileSystem->makeDirectory($version);
        }
        return $namespace;
    }