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defmodule Makeup.Token.Utils.Hierarchy do
@moduledoc false
def hierarchy_to_precedence(hierarchy) do
hierarchy
|> Enum.map(&dependencies/1)
|> List.flatten
|> Enum.reverse
end
def node_tag({tag, _, _}), do: tag
def node_tag({tag, _}), do: tag
defp descendants({_, _, children}) do
first_degree = Enum.map(children, &node_tag/1)
higher_degree = children |> Enum.map(&descendants/1)
(first_degree ++ higher_degree) |> List.flatten
end
defp descendants(_terminal), do: []
defp dependencies({tag, _, children} = node) do
node_dependencies = {tag, descendants(node)}
children_dependencies = children
|> Enum.map(&dependencies/1)
|> List.flatten
[node_dependencies | children_dependencies]
end
defp dependencies(_terminal), do: []
def to_nested_list_of_pairs({tag, class, children}) do
[{tag, class} | Enum.map(children, &to_nested_list_of_pairs/1)]
end
def to_nested_list_of_pairs({tag, class}) do
{tag, class}
end
def style_to_class_map(hierarchy) do
hierarchy
|> Enum.map(&to_nested_list_of_pairs/1)
|> List.flatten
|> Enum.into(%{})
end
end
|
