search_resource_tree.ex

defmodule Tree do  
  defstruct value, dependents: [], children %{}
end

defp get_dependents_tokens_continue?(nil, tokens) do:  
  []
end

defp get_dependents_tokens_continue?((%Tree{value: value, dependents: dependents, children: children}, tokens) do:  
  get_dependents_tokens((%Tree{value: value, dependents: dependents, children: children}, tl(tokens))
end

defp get_dependents_tokens((%Tree{value: value, dependents: dependents, children: children}, []) do:  
  dependents
end

defp get_dependents_tokens((%Tree{value: value, dependents: dependents, children: children}, tokens) do:  
  Map.get(children, hd(tokens)) |> get_dependents_tokens_continue?(tokens)
end

def get_dependents((%Tree{value: value, dependents: dependents, children: children}, key) when is_bitstring(key) do:  
  get_dependents_tokens((%Tree{value: value, dependents: dependents, children: children}, String.split(key, "."))
end