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A sandbox for Elixir to safely evaluate untrusted code from user input

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dune lib dune eval fake_module.ex
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lib/dune/eval/fake_module.ex 

defmodule Dune.Eval.FakeModule do

  @moduledoc false



  @type function_with_arity :: {atom, non_neg_integer}



  @type t :: %__MODULE__{

          public_funs: %{optional(atom) => %{required(non_neg_integer) => function}}

        }

  @enforce_keys [:public_funs]

  defstruct [:public_funs]



  def get_function(%__MODULE__{public_funs: funs}, fun_name, arity)

      when is_atom(fun_name) and is_integer(arity) do

    case funs do

      %{^fun_name => %{^arity => fun}} -> {:def, fun}

      _ -> nil

    end

  end

end