Perform a bit of user supplied action code (supplied by generated subclass). Actions are indexed by an internal action number assigned at parser generation time.
|act_num ||the internal index of the action to be performed. |
|parser ||the parser object we are acting for. |
|stack ||the parse stack of that object. |
|top ||the index of the top element of the parse stack. |
Referenced by debug_parse(), parse(), and parse_lookahead().