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Liquid implementation in elixir

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liquid lib protocols blank.ex
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lib/protocols/blank.ex 

defprotocol Blank do

  @doc "Returns true when blank"

  def blank?(data)

end



defimpl Blank, for: List do

  alias Liquid.Block

  alias Liquid.Tag



  def blank?([]), do: true

  def blank?(list) do

    list

      |> Enum.all?(fn

          (x) when is_binary(x) ->

            cond do

              Regex.match?(~r/\A\s*\z/, x) -> true

              true -> false

            end

          (%Block{blank: true}) -> true

          (%Tag{blank: true}) -> true

          (_) -> false

        end)

  end

end