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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) -> !!Regex.match?(~r/\A\s*\z/, x)
      %Block{blank: true} -> true
      %Tag{blank: true} -> true
      _ -> false
    end)
  end
end

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