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absinthe lib absinthe phase schema mark_referenced.ex
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lib/absinthe/phase/schema/mark_referenced.ex 

defmodule Absinthe.Phase.Schema.MarkReferenced do

  @moduledoc false



  use Absinthe.Phase



  alias Absinthe.Blueprint.{Schema, TypeReference}



  def run(blueprint, _opts) do

    %{schema_definitions: [schema]} = blueprint



    schema =

      Map.update!(

        schema,

        :type_definitions,

        &mark_referenced(&1, schema.directive_definitions, schema.schema_declaration)

      )



    {:ok, %{blueprint | schema_definitions: [schema]}}

  end



  defp mark_referenced(type_defs, directive_defs, schema_declaration) do

    types_by_ref =

      Enum.reduce(type_defs, %{}, fn type_def, acc ->

        acc

        |> Map.put(type_def.identifier, type_def)

        |> Map.put(type_def.name, type_def)

      end)



    referenced_type_ids =

      schema_declaration.field_definitions

      |> Enum.map(&Map.get(types_by_ref, &1.identifier))

      |> Enum.reject(&is_nil/1)

      |> Enum.concat(directive_defs)

      |> Enum.reduce(MapSet.new(), &referenced_types(&1, types_by_ref, &2))



    for type <- type_defs do

      if type.identifier in referenced_type_ids do

        put_in(type.__private__[:__absinthe_referenced__], true)

      else

        type

      end

    end

  end



  defp referenced_types(%Schema.InputValueDefinition{type: type}, types, acc) do

    referenced_types(type, types, acc)

  end



  defp referenced_types(%Schema.DirectiveDefinition{} = type, types, acc) do

    type.arguments

    |> Enum.reduce(acc, &referenced_types(&1, types, &2))

  end



  defp referenced_types(%Schema.EnumTypeDefinition{identifier: identifier}, _types, acc) do

    MapSet.put(acc, identifier)

  end



  defp referenced_types(%Schema.FieldDefinition{} = field, types, acc) do

    acc =

      field.arguments

      |> Enum.reduce(acc, &referenced_types(&1, types, &2))



    referenced_types(field.type, types, acc)

  end



  defp referenced_types(

         %Schema.InputObjectTypeDefinition{identifier: identifier} = input_object,

         types,

         acc

       ) do

    if identifier in acc do

      acc

    else

      acc = MapSet.put(acc, identifier)



      input_object.fields

      |> Enum.reduce(acc, &referenced_types(&1, types, &2))

    end

  end



  defp referenced_types(

         %Schema.InterfaceTypeDefinition{identifier: identifier} = interface,

         schema,

         acc

       ) do

    if identifier in acc do

      acc

    else

      acc = MapSet.put(acc, identifier)



      acc =

        interface

        |> Schema.InterfaceTypeDefinition.find_implementors(Map.values(schema))

        |> Enum.reduce(acc, &referenced_types(&1, schema, &2))



      interface.fields

      |> Enum.reduce(acc, &referenced_types(&1, schema, &2))

    end

  end



  defp referenced_types(%TypeReference.List{of_type: inner_type}, schema, acc) do

    referenced_types(inner_type, schema, acc)

  end



  defp referenced_types(%TypeReference.NonNull{of_type: inner_type}, schema, acc) do

    referenced_types(inner_type, schema, acc)

  end



  defp referenced_types(

         %Schema.ObjectTypeDefinition{identifier: identifier} = object,

         schema,

         acc

       ) do

    if identifier in acc do

      acc

    else

      acc = MapSet.put(acc, identifier)



      acc =

        object.fields

        |> Enum.reduce(acc, &referenced_types(&1, schema, &2))



      object.interfaces

      |> Enum.reduce(acc, &referenced_types(&1, schema, &2))

    end

  end



  defp referenced_types(%Schema.ScalarTypeDefinition{identifier: identifier}, _schema, acc) do

    MapSet.put(acc, identifier)

  end



  defp referenced_types(%Schema.UnionTypeDefinition{identifier: identifier} = union, schema, acc) do

    if identifier in acc do

      acc

    else

      acc = MapSet.put(acc, identifier)



      union.types

      |> Enum.reduce(acc, &referenced_types(&1, schema, &2))

    end

  end



  defp referenced_types(%TypeReference.Identifier{} = ref, schema, acc) do

    referenced_types(Map.fetch!(schema, ref.id), schema, acc)

  end



  defp referenced_types(%TypeReference.Name{} = ref, schema, acc) do

    referenced_types(Map.fetch!(schema, ref.name), schema, acc)

  end



  defp referenced_types(type, schema, acc) when is_atom(type) and type != nil do

    referenced_types(Map.fetch!(schema, type), schema, acc)

  end

end