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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 preprocess remap_static_value.ex
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lib/bin_struct/macro/preprocess/remap_static_value.ex 

defmodule BinStruct.Macro.Preprocess.RemapStaticValue do



  @moduledoc false



  def remap_static_value(static_value, opts, env) do



    case static_value do



      {:<<>>, _meta, _value } ->



        size_bits_ast =



          quote do



            bit_size(

              unquote(static_value)

            )



          end



        { size_bits, _binding } = Code.eval_quoted(size_bits_ast, [], env)





        {

          :static_value,

          %{

            value: static_value,

            size_bits: size_bits

          }

        }



      static_value when is_binary(static_value) or is_bitstring(static_value) ->



        size_bits = bit_size(static_value)



        {

          :static_value,

          %{

            value: static_value,

            size_bits: size_bits

          }

        }



      { :static, ast }  ->



        { result, _binding } = Code.eval_quoted(ast, [], env)



        remap_static_value(result, opts, env)



    end



  end





end