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elixir_script

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ElixirScript: compiles Elixir code to JavaScript

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elixir_script priv std_lib enumerable.ex
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priv/std_lib/enumerable.ex 

defprotocol ElixirScript.Enumerable do

  @moduledoc false  

  def reduce(enumerable, acc, fun)

  def member?(enumerable, element)

  def count(enumerable)

end



defimpl ElixirScript.Enumerable, for: List do

  def count(list),

    do: length(list)



  def member?(list, value),

    do: value in list



  def reduce(_,       {:halt, acc}, _fun),   do: {:halted, acc}

  def reduce(list,    {:suspend, acc}, fun), do: {:suspended, acc, &reduce(list, &1, fun)}

  def reduce([],      {:cont, acc}, _fun),   do: {:done, acc}

  def reduce([h | t], {:cont, acc}, fun),    do: reduce(t, fun.(h, acc), fun)

end



defimpl ElixirScript.Enumerable, for: Map do

  def count(map) do

    {:ok, map_size(map)}

  end



  def member?(map, {key, value}) do

    {:ok, match?(^value, Map.get(map, key))}

  end



  def member?(_, _) do

    {:ok, false}

  end



  def reduce(map, acc, fun) do

    do_reduce(Map.to_list(map), acc, fun)

  end



  defp do_reduce(_,       {:halt, acc}, _fun),   do: {:halted, acc}

  defp do_reduce(list,    {:suspend, acc}, fun), do: {:suspended, acc, &do_reduce(list, &1, fun)}

  defp do_reduce([],      {:cont, acc}, _fun),   do: {:done, acc}

  defp do_reduce([h | t], {:cont, acc}, fun),    do: do_reduce(t, fun.(h, acc), fun)

end