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Functional lenses for nested structures

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pathex lib pathex builder selectors matchable_selector.ex
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lib/pathex/builder/selectors/matchable_selector.ex 

defmodule Pathex.Builder.MatchableSelector do



  @behaviour Pathex.Builder.Selector

  import Pathex.Builder.Selector



  def build(combination) do

    getters =

      combination

      |> Pathex.Combination.to_paths()

      |> Enum.flat_map(&path_to_getter/1)



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

    |> Pathex.Builder.Code.new_one_arg_pipe()

  end



  defp path_to_getter(path) do

    x = {:x, [], Elixir}

    {:ok, match} = match_from_path(path, x)

    quote do

      unquote(match) -> {:ok, unquote(x)}

    end

  end



end