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absinthe lib absinthe schema verification.ex
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lib/absinthe/schema/verification.ex 

defmodule Absinthe.Schema.Verification do



  @moduledoc false



  alias __MODULE__

  alias Absinthe.Traversal

  alias Absinthe.Schema



  @spec setup(Schema.t) :: Schema.t

  def setup(%{errors: []} = schema) do

    errors = Traversal.reduce(schema, schema, schema.errors, &collect_errors/3)

    %{schema | errors: errors}

    |> Verification.Unions.check

  end

  def setup(schema) do

    schema

  end



  # Don't allow anything named with a __ prefix

  @spec collect_errors(Traversal.Node.t, Traversal.t, [binary]) :: Traversal.instruction_t

  defp collect_errors(%{__struct__: definition_type, name: "__" <> name}, traversal, errs) do

    definition_name = definition_type |> Module.split |> List.last

    errs = [format_error(:double_underscore, %{definition: definition_name, name: name}) | errs]

    {:ok, errs, traversal}

  end

  # No-op

  defp collect_errors(_node, traversal, errs) do

    {:ok, errs, traversal}

  end



  defp format_error(:double_underscore, %{definition: definition, name: name}) do

    "#{definition} `__#{name}': Must not define any types, fields, arguments, or any other type system artifact with two leading underscores."

  end



end