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solid lib solid context.ex
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lib/solid/context.ex 

defmodule Solid.Context do

  defstruct vars: %{}, counter_vars: %{}, iteration_vars: %{}

  @type t :: %__MODULE__{vars: Map.t(), counter_vars: Map.t()}

  @type scope :: :counter_vars | :vars | :iteration_vars



  @doc """

  Get data from context respecting the scope order provided.



  Possible scope values: :counter_vars or :vars

  """

  @spec get_in(t(), [term()], [scope]) :: term

  def get_in(context, key, scopes) do

    Enum.reduce(scopes, nil, fn scope, value ->

      get_from_scope(context, scope, key, value)

    end)

  end



  defp get_from_scope(context, :vars, key, nil) do

    do_get_in(context.vars, key)

  end



  defp get_from_scope(context, :counter_vars, key, nil) do

    do_get_in(context.counter_vars, key)

  end



  defp get_from_scope(context, :iteration_vars, key, nil) do

    do_get_in(context.iteration_vars, key)

  end



  defp get_from_scope(_context, _scope, _key, value), do: value



  defp do_get_in(nil, _), do: nil

  defp do_get_in(data, []), do: data



  defp do_get_in(data, [key | keys]) when is_map(data) do

    do_get_in(data[key], keys)

  end



  defp do_get_in(_, _), do: nil

end