docs: def build_on_entry(self, runnable, regime, on_entry):
          """
          Build OnEntry start handler code.
  
          @param on_entry: OnEntry start handler object
          @type on_entry: lems.model.dynamics.OnEntry
  
          @return: Generated OnEntry code
          @rtype: list(string)
          """
  
          on_entry_code = []
  
          on_entry_code += ['if self.current_regime != self.last_regime:']
          on_entry_code += ['    self.last_regime = self.current_regime']
  
          for action in on_entry.actions:
              code = self.build_action(runnable, regime, action)
              for line in code:
                  on_entry_code += ['    ' + line]
  
          return on_entry_code