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BinStruct is a library which provides you rich set of tools for parsing/encoding binaries

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bin_struct lib bin_struct macro option_function.ex
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lib/bin_struct/macro/option_function.ex 

defmodule BinStruct.Macro.OptionFunction do



  @moduledoc false



  def option_function(name, _parameters, _env) do



    function_name = :"option_#{name}"



    quote do



      def unquote(function_name)(options \\ [], option_value)



      def unquote(function_name)(options, option_value) when is_list(options) do



        new_option = { __MODULE__, unquote(name), option_value }



        [ new_option | options ]



      end



      def unquote(function_name)(options_map, option_value) when is_map(options_map) do



        interface = __MODULE__

        name = unquote(name)



        %{

          ^interface => options_in_interface

        } = options_map



        %{

          options_map |

          interface => %{

            options_in_interface |

            name => option_value

          }

        }



      end



    end



  end



end