implemented stepping mode

gauss-turing/webserver/gauss_turing.py

@@ -420,6 +420,9 @@ class Game:
                 elif event.key == pygame.K_r:
                     # run program
                     self.state = 'running'
+                elif event.key == pygame.K_s:
+                    self.state = 'manual'
+                    self.prg.step()
         return self.state
 
     def reset(self):
@@ -442,6 +445,8 @@ class Game:
                 self.state = self.reset()
             elif self.state == 'quit':
                 running = False
+            elif self.state == 'manual':
+                pass
             else:
                 print("unknown state")
                 return
@@ -453,3 +458,7 @@ if __name__ == "__main__":
     random.seed(42)
     game = Game(dimx=7, dimy=4, robotx=3, roboty=1)
     game.run()
+
+# TODOs
+# - in stepping mode (s) it is possible to drive outside of the map
+# - when no P0 command is present the program counter will overflow