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Functional lenses for nested structures

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pathex lib pathex builder setters simple_setter.ex
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lib/pathex/builder/setters/simple_setter.ex 

defmodule Pathex.Builder.SimpleSetter do



  @moduledoc """

  Setter which simply sets new value in given path

  """



  import Pathex.Builder.Setter

  @behaviour Pathex.Builder.Setter



  @first_arg {:first_arg, [], Elixir}

  @initial {:value_to_set, [], Elixir}



  def build(combination) do

    combination

    |> Enum.reverse()

    |> Enum.reduce(initial(), &reduce_into/2)

    |> wrap_to_code(@first_arg, @initial)

  end



  defp reduce_into(path_items, acc) do

    setters = Enum.flat_map(path_items, & create_setter(&1, acc))

    {:case, [], [[do: setters ++ fallback()]]}

  end



  defp initial do

    quote do

      (fn _ -> unquote(@initial) end).()

    end

  end



end