Build OnStart start handler code.

        @param on_start: OnStart start handler object
        @type on_start: lems.model.dynamics.OnStart

        @return: Generated OnStart code
        @rtype: list(string)

def build_on_start(self, runnable, regime, on_start):
        """
        Build OnStart start handler code.

        @param on_start: OnStart start handler object
        @type on_start: lems.model.dynamics.OnStart

        @return: Generated OnStart code
        @rtype: list(string)
        """

        on_start_code = []

        for action in on_start.actions:
            code = self.build_action(runnable, regime, action)
            for line in code:
                on_start_code += [line]

        return on_start_code