code: function parseAndAddServiceFromFile($serviceFilename) {
          $service = require $serviceFilename;
  
          if ($service == false) {
              throw new APIBuilderException("Failed to open service file `$serviceFilename`.");
          }
          if (is_array($service) == false) {
              throw new APIBuilderException("File `$serviceFilename` did not return a service array. Cannot build API from it.");
          }
  
          $this->parseAndAddService($service);
      }
docs: Parses a service file and adds all the operations to this
  @param $serviceFilename
  @return array
  @throws APIBuilderException