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absinthe lib absinthe phase.ex
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lib/absinthe/phase.ex 

defmodule Absinthe.Phase do



  @moduledoc """

  Behaviour for Absinthe Phases.



  A phase takes an `Absinthe.Blueprint` document and returns another blueprint document.

  All validation, resolution, and result building happens via phases. See

  `Absinthe.Pipeline` for information on how to run phases. See the code under

  this namespace for information on individual phases.

  """



  @type t :: module

  @type result_t ::

      {:ok, any}

    | {:jump, any, t}

    | {:insert, any, t | [t]}

    | {:replace, any, t | [t]}

    | {:error, String.t}



  alias __MODULE__

  alias Absinthe.Blueprint



  defmacro __using__(_) do

    quote do

      @behaviour Phase

      import(unquote(__MODULE__))



      @spec flag_invalid(Blueprint.node_t) :: Blueprint.node_t

      def flag_invalid(%{flags: _} = node) do

        Absinthe.Blueprint.put_flag(node, :invalid, __MODULE__)

      end



      @spec flag_invalid(Blueprint.node_t, atom) :: Blueprint.node_t

      def flag_invalid(%{flags: _} = node, flag) do

        flagging = %{:invalid => __MODULE__, flag => __MODULE__}

        update_in(node.flags, &Map.merge(&1, flagging))

      end



      def put_flag(%{flags: _} = node, flag) do

        Absinthe.Blueprint.put_flag(node, flag, __MODULE__)

      end



      def inherit_invalid(%{flags: _} = node, children, add_flag) do

        case any_invalid?(children) do

          true ->

            flag_invalid(node, add_flag)

          false ->

            node

        end

      end



    end

  end



  @spec put_error(Blueprint.node_t, Phase.Error.t) :: Blueprint.node_t

  def put_error(%{errors: _} = node, error) do

    update_in(node.errors, &[error | &1])

  end



  def any_invalid?(nodes) do

    Enum.any?(nodes, &match?(%{flags: %{invalid: _}}, &1))

  end



  @callback run(any, any) :: result_t



end