escape.exs

defp escape({ left, meta,  right }) do
  { '{}', meta, [escape(left), meta, escape(right)] }
end

defp escape({ left, right }) do
  { escape(left), escape(right) }
end

defp escape(list) when is_list(list) do
  Enum.map(list, escape(&1))
end

defp escape(other) do
  other
end