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absinthe lib absinthe phase document validation repeatable_directives.ex
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lib/absinthe/phase/document/validation/repeatable_directives.ex 

defmodule Absinthe.Phase.Document.Validation.RepeatableDirectives do

  @moduledoc false



  alias Absinthe.{Blueprint, Phase}



  use Absinthe.Phase



  @doc """

  Run the validation.

  """

  @spec run(Blueprint.t(), Keyword.t()) :: Phase.result_t()

  def run(input, _options \\ []) do

    result = Blueprint.postwalk(input, &handle_node/1)

    {:ok, result}

  end



  defp handle_node(%Blueprint.Directive{} = node) do

    node

  end



  defp handle_node(%{directives: []} = node) do

    node

  end



  defp handle_node(%{directives: _} = node) do

    node

    |> check_directives

    |> inherit_invalid(node.directives, :bad_directive)

  end



  defp handle_node(node) do

    node

  end



  defp check_directives(node) do

    directives =

      for directive <- node.directives do

        case directive do

          %{schema_node: nil} ->

            directive



          %{schema_node: %{repeatable: true}} ->

            directive



          directive ->

            check_duplicates(

              directive,

              Enum.filter(

                node.directives,

                &compare_directive_schema_node(directive.schema_node, &1.schema_node)

              )

            )

        end

      end



    %{node | directives: directives}

  end



  defp compare_directive_schema_node(_, nil), do: false



  defp compare_directive_schema_node(%{identifier: identifier}, %{identifier: identifier}),

    do: true



  defp compare_directive_schema_node(_, _), do: false



  # Generate the error for the node

  @spec error_repeated(Blueprint.node_t()) :: Phase.Error.t()

  defp error_repeated(node) do

    %Phase.Error{

      phase: __MODULE__,

      message: "Directive `#{node.name}' cannot be applied repeatedly.",

      locations: [node.source_location]

    }

  end



  defp check_duplicates(directive, [_single]) do

    directive

  end



  defp check_duplicates(directive, _multiple) do

    directive

    |> flag_invalid(:duplicate_directive)

    |> put_error(error_repeated(directive))

  end

end