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dogma lib dogma rule interpolation_only_string.ex
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lib/dogma/rule/interpolation_only_string.ex 

use Dogma.RuleBuilder



defrule Dogma.Rule.InterpolationOnlyString do

  @moduledoc """

  A rule that disallows strings which are entirely the result of an

  interpolation.



  Good:



     output = inspect(self)



  Bad:



      output = "#\{inspect self}"

  """



  def test(_rule, script) do

    script

    |> Script.walk(&check_ast(&1, &2))

  end





  defp check_ast({:sigil_r, _, _}, errors) do

    {[], errors}

  end



  defp check_ast(

    {:<<>>, meta, [{:::, _, [{{:., _, call}, _, _}, _]} ]} = ast,

    errors

  ) when call == [Kernel, :to_string]

  do

    {ast, [ error(meta[:line]) | errors ]}

  end



  defp check_ast(ast, errors) do

    {ast, errors}

  end





  defp error(pos) do

    %Error{

      rule:    __MODULE__,

      message: "Useless string interpolation detected.",

      line:    pos,

    }

  end

end