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absinthe lib absinthe blueprint directive.ex
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lib/absinthe/blueprint/directive.ex 

defmodule Absinthe.Blueprint.Directive do

  @moduledoc false



  alias Absinthe.{Blueprint, Phase}



  @enforce_keys [:name]

  defstruct [

    :name,

    arguments: [],

    # When part of a Document

    source_location: nil,

    # Added by phases

    schema_node: nil,

    flags: %{},

    errors: [],

    __reference__: nil,

    __private__: []

  ]



  @type t :: %__MODULE__{

          name: String.t(),

          arguments: [Blueprint.Input.Argument.t()],

          source_location: nil | Blueprint.SourceLocation.t(),

          schema_node: nil | Absinthe.Type.Directive.t(),

          flags: Blueprint.flags_t(),

          errors: [Phase.Error.t()],

          __reference__: nil,

          __private__: []

        }



  @spec expand(t, Blueprint.node_t()) :: {t, map}

  def expand(%__MODULE__{schema_node: nil}, node) do

    node

  end



  def expand(%__MODULE__{schema_node: type} = directive, node) do

    args = Blueprint.Input.Argument.value_map(directive.arguments)



    case Absinthe.Type.function(type, :expand) do

      nil ->

        # Directive is a no-op

        node



      expansion when is_function(expansion) ->

        expansion.(args, node)

    end

  end



  @doc """

  Determine the placement name for a given Blueprint node

  """

  @spec placement(Blueprint.node_t()) :: nil | atom

  def placement(%Blueprint.Document.Operation{type: type}), do: type

  def placement(%Blueprint.Document.Field{}), do: :field

  def placement(%Blueprint.Document.Fragment.Named{}), do: :fragment_definition

  def placement(%Blueprint.Document.Fragment.Spread{}), do: :fragment_spread

  def placement(%Blueprint.Document.Fragment.Inline{}), do: :inline_fragment

  def placement(%Blueprint.Schema.SchemaDefinition{}), do: :schema

  def placement(%Blueprint.Schema.SchemaDeclaration{}), do: :schema

  def placement(%Blueprint.Schema.ScalarTypeDefinition{}), do: :scalar

  def placement(%Blueprint.Schema.ObjectTypeDefinition{}), do: :object

  def placement(%Blueprint.Schema.FieldDefinition{}), do: :field_definition

  def placement(%Blueprint.Schema.InterfaceTypeDefinition{}), do: :interface

  def placement(%Blueprint.Schema.UnionTypeDefinition{}), do: :union

  def placement(%Blueprint.Schema.EnumTypeDefinition{}), do: :enum

  def placement(%Blueprint.Schema.EnumValueDefinition{}), do: :enum_value

  def placement(%Blueprint.Schema.InputObjectTypeDefinition{}), do: :input_object

  def placement(%Blueprint.Schema.InputValueDefinition{placement: placement}), do: placement

end