big refactoring

components/scan.lua

@@ -37,15 +37,15 @@ do
 		call(on_complete)
 	end
 
-	function accessor.state()
-		local _, state = next(filter(scan_states, function(state) return state.id == control.thread_id end))
-		return state
-	end
+	private.state{
+		get = function()
+			local _, state = next(filter(scan_states, function(state) return state.id == control.thread_id end))
+			return state
+		end,
+	}
 end
 
-function accessor.query()
-    return state.params.queries[state.query_index]
-end
+private.query{get=function() return state.params.queries[state.query_index] end}
 
 function wait_for_callback(...)
 	local send_signal, signal_received = signal()