jetons

defmodule Jetons.Transforms do
  @moduledoc """
  Applies type-based transforms to flattened token lists.
  """

  def apply_transforms(tokens, _type_map, []), do: tokens

  def apply_transforms(tokens, type_map, transforms) do
    transform_map = Map.new(transforms)
    Enum.map(tokens, &transform_token(&1, type_map, transform_map))
  end

  defp transform_token({path, value}, type_map, transform_map) do
    with type when not is_nil(type) <- type_map[path],
         fun when not is_nil(fun) <- transform_map[type] do
      {path, fun.(value)}
    else
      _ -> {path, value}
    end
  end
end