Diff: core/automaton.h

Revision:

26:b4421d1ee57a

Parent:

4:fcf597f82632

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/automaton.h	Thu Jul 05 20:15:37 2018 +0000
@@ -0,0 +1,67 @@
+#ifndef AUTOMATON_H_
+#define AUTOMATON_H_
+
+#include "mbed.h"
+
+namespace automaton
+{
+    
+    /**
+    *   event enum to notice changes to the instance
+    */
+    enum Event
+    {
+        None        = 0x00,
+        Transition  = 0x01,
+        Done        = 0x02,
+    };
+    
+    /**
+     * a callback that does nothing
+     */
+    void do_nothing_callback();
+    
+    extern Callback<void()> entry;
+    extern Callback<void()> teardown_prev;
+    extern Callback<void()> setup_next;
+    extern volatile Event      event;
+    
+    /**
+    *   marks for performing a transition from FromState to ToState.
+    */
+    template<typename FromState, typename ToState>
+    void jump()
+    {
+        if ( event == None ){
+            teardown_prev = &FromState::teardown;
+            setup_next    = &ToState::setup;
+            event = Transition;
+        }
+    }
+    
+    template<typename State>
+    void done()
+    {
+        if (event == None){
+            teardown_prev = &State::teardown;
+            setup_next    = &do_nothing_callback;
+            event = Done;
+        }
+    }
+    
+    template<typename State>
+    void init()
+    {
+        entry           = &State::setup;
+        teardown_prev   = &do_nothing_callback;
+        setup_next      = &do_nothing_callback;
+        event           = None;
+    }
+
+    /**
+    *   runs the automaton once
+    */
+    void run();
+    
+}
+#endif