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Functional lenses for nested structures

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pathex lib pathex builder viewers matchable_viewer.ex
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lib/pathex/builder/viewers/matchable_viewer.ex 

defmodule Pathex.Builder.MatchableViewer do

  # Viewer-builder which creates function which matches with one big case

  @moduledoc false



  alias Pathex.Common

  import Pathex.Builder.Viewer

  @behaviour Pathex.Builder



  @structure_variable {:x, [], Elixir}

  @function_variable {:function, [], Elixir}



  def build(combination) do

    getters =

      combination

      |> Pathex.Combination.to_paths()

      |> Enum.flat_map(&path_to_getter(&1))



    (getters ++ fallback())

    |> Common.to_case()

    |> Pathex.Builder.Code.new_arg_pipe([@structure_variable, @function_variable])

  end



  defp path_to_getter(path) do

    x = {:x, [], Elixir}

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



    quote do

      unquote(match) -> unquote(@function_variable).(unquote(x))

    end

  end

end