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Functional lenses for nested structures

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pathex lib pathex lenses filtering.ex
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lib/pathex/lenses/filtering.ex 

defmodule Pathex.Lenses.Filtering do

  # Private module for `filtering(condition)` lens

  # > see `Pathex.Lenses.filtering/1` documentation

  @moduledoc false



  @spec filtering((any() -> boolean() | any())) :: Pathex.t()

  def filtering(predicate) do

    fn

      op, {structure, func} when op in ~w[update view delete]a ->

        if(predicate.(structure), do: func.(structure), else: :error)



      :force_update, {structure, func, default} ->

        if(predicate.(structure), do: func.(structure), else: {:ok, default})



      :inspect, _ ->

        {:filtering, [], [inspect(predicate)]}

    end

  end

end