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absinthe lib absinthe phase document uses.ex
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lib/absinthe/phase/document/uses.ex 

defmodule Absinthe.Phase.Document.Uses do

  @moduledoc false



  # Tracks uses of:

  # - Variables

  # - Fragments



  use Absinthe.Phase

  alias Absinthe.Blueprint



  @typep acc_t :: %{

           fragments_available: [Blueprint.Document.Fragment.Named.t()],

           fragments: [Blueprint.Document.Fragment.Named.Use.t()],

           variables: [Blueprint.Input.Variable.Use.t()]

         }



  @spec run(Blueprint.t(), Keyword.t()) :: {:ok, Blueprint.t()}

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

    ops = Enum.map(input.operations, &add_uses(&1, input))

    node = %{input | operations: ops}

    {:ok, node}

  end



  @spec add_uses(Blueprint.Document.Operation.t(), Blueprint.t()) ::

          Blueprint.Document.Operation.t()

  defp add_uses(%Blueprint.Document.Operation{} = node, doc) do

    acc = %{

      fragments_available: doc.fragments,

      fragments: [],

      variables: []

    }



    {_, acc} = Blueprint.prewalk(node, acc, &handle_use/2)



    %{

      node

      | fragment_uses: acc.fragments ++ node.fragment_uses,

        variable_uses: acc.variables ++ node.variable_uses

    }

  end



  @spec handle_use(Blueprint.node_t(), acc_t) :: {Blueprint.node_t(), acc_t}

  defp handle_use(%Blueprint.Document.Fragment.Spread{} = node, acc) do

    if uses?(acc.fragments, node) do

      {node, acc}

    else

      target_fragment = Enum.find(acc.fragments_available, &(&1.name == node.name))



      if target_fragment do

        acc = acc |> put_use(target_fragment)

        {_, acc} = Blueprint.prewalk(target_fragment, acc, &handle_use/2)

        {node, acc}

      else

        {node, acc}

      end

    end

  end



  defp handle_use(%Blueprint.Input.Variable{} = node, acc) do

    {node, put_use(acc, node)}

  end



  defp handle_use(node, acc) do

    {node, acc}

  end



  @spec uses?([Blueprint.use_t()], Blueprint.Document.Fragment.Spread.t()) :: boolean

  defp uses?(list, node) do

    Enum.find(list, &(&1.name == node.name))

  end



  @spec put_use(acc_t, Blueprint.node_t()) :: acc_t

  defp put_use(acc, %Blueprint.Input.Variable{} = node) do

    ref = Blueprint.Input.Variable.to_use(node)

    update_in(acc.variables, &[ref | &1])

  end



  defp put_use(acc, %Blueprint.Document.Fragment.Named{} = node) do

    ref = Blueprint.Document.Fragment.Named.to_use(node)

    update_in(acc.fragments, &[ref | &1])

  end

end