module BinData::MultiFieldArgSeparator

def field_names_in_parameters?(obj_class, parameters)
  field_names = obj_class.fields.field_names
  param_keys = parameters.keys
  (field_names & param_keys).length > 0
end

def parameters_is_value?(obj_class, value, parameters)
  if value.nil? and parameters.length > 0
    field_names_in_parameters?(obj_class, parameters)
  else
    false
  end
end

def separate_args(obj_class, obj_args)
  value, parameters, parent = super(obj_class, obj_args)
  if parameters_is_value?(obj_class, value, parameters)
    value = parameters
    parameters = {}
  end
  [value, parameters, parent]
end