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exprotobuf

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exprotobuf provides native encoding/decoding of protobuf messages via generated modules/structs.

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exprotobuf lib exprotobuf define_enum.ex
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lib/exprotobuf/define_enum.ex 

defmodule Protobuf.DefineEnum do

  @moduledoc false



  @doc """

  Defines a new module which contains two functions, atom(value) and value(atom), for

  getting either the name or value of an enumeration value.

  """

  def def_enum(name, values, inject: inject) do

    enum_atoms = Enum.map values, fn {a, _} -> a end

    enum_values = Enum.map values, fn {_, v} -> v end

    contents = for {atom, value} <- values do

      quote do

        def value(unquote(atom)), do: unquote(value)

        def values(), do: unquote(enum_values)

        def atom(unquote(value)), do: unquote(atom)

        def atoms(), do: unquote(enum_atoms)

      end

    end

    if inject do

      quote do

        unquote(contents)

        def value(_), do: nil

        def atom(_),  do: nil

      end

    else

      quote do

        defmodule unquote(name) do

          unquote(contents)

          def value(_), do: nil

          def atom(_), do: nil

        end

      end

    end

  end

end