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absinthe lib absinthe execution input.ex
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lib/absinthe/execution/input.ex 

defmodule Absinthe.Execution.Input do

  @moduledoc false



  # Common functionality for Arguments and Variables



  alias Absinthe.Execution

  alias __MODULE__.Meta



  def process(input_type, meta, execution) do

    name = input_type

    |> Atom.to_string

    |> String.capitalize



    {execution, missing} = process_errors(execution, meta, input_type, :missing, fn type_name ->

      &"#{name} `#{&1}' (#{type_name}): Not provided"

    end)



    {execution, invalid} = process_errors(execution, meta, input_type, :invalid, fn type_name ->

      &"#{name} `#{&1}' (#{type_name}): Invalid value provided"

    end)



    {execution, _} = process_errors(execution, meta, input_type, :extra, &"#{name} `#{&1}': Not present in schema")



    {execution, _} = process_errors(execution, meta, input_type, :deprecated, nil)



    case Enum.any?(missing) || Enum.any?(invalid) do

      true ->

        {:error, missing, invalid, execution}

      false ->

        {:ok, execution}

    end

  end



  def process_errors(execution, meta, kind, key, default_msg) do

    meta

    |> Map.fetch!(key)

    |> Enum.reduce({execution, []}, fn

      %{name: name, ast: ast, type: type, msg: msg}, {exec, names} ->

        name = name |> dotted_name(execution.adapter)

        exec = exec |> Execution.put_error(kind, name, error_message(msg || default_msg, type), at: ast)



        {exec, [name | names]}

    end)

  end



  @compile {:inline, parse_scalar: 5}

  def parse_scalar(nil, _, _, _type_stack, meta) do

    {:ok, nil, meta}

  end

  def parse_scalar(value, ast, %{parse: parser} = type, type_stack, meta) do

    case parser.(value) do

      {:ok, coerced_value} ->

        {:ok, coerced_value, meta}



      :error ->

        {:error, Meta.put_invalid(meta, type_stack, type, ast)}

    end

  end



  defp error_message(msg, nil), do: msg

  defp error_message(msg, type) when is_function(msg) do

    msg.(type.name)

  end

  defp error_message(msg, _), do: msg



  @spec dotted_name([binary], atom) :: binary

  def dotted_name(names, adapter) do

    names

    |> do_dotted_names(adapter, [])

    |> IO.iodata_to_binary

  end



  defp do_dotted_names([name | []], adapter, acc) do

    [format_name(name, adapter) | acc]

  end

  defp do_dotted_names(["[]" | rest], adapter, acc) do

    do_dotted_names(rest, adapter, ["[]" | acc])

  end

  defp do_dotted_names([name | rest], adapter, acc) do

    do_dotted_names(rest, adapter, [ ".", format_name(name, adapter) | acc])

  end



  defp format_name(name, adapter) do

    name

    |> to_string

    |> adapter.to_external_name(:argument)

  end

end