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wongi_engine

0.9.2
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A pure-Elixir rule engine.

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wongi_engine lib wongi engine action generator.ex
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lib/wongi/engine/action/generator.ex 

defmodule Wongi.Engine.Action.Generator do

  @moduledoc false

  alias Wongi.Engine.WME

  defstruct [:template]



  def new(s, p, o) do

    %__MODULE__{

      template: WME.new(s, p, o)

    }

  end



  defimpl Wongi.Engine.Action do

    alias Wongi.Engine.DSL.Var

    alias Wongi.Engine.Rete



    def execute(%@for{template: template}, token, rete) do

      wme =

        [:subject, :predicate, :object]

        |> Enum.map(fn field ->

          case template[field] do

            %Var{name: name} -> token[name]

            literal -> literal

          end

        end)

        |> WME.new()



      # consistency check



      Rete.assert(rete, wme, token)

    end



    def deexecute(_, _, rete) do

      rete

    end

  end

end