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      1 grammar t030specialStates;
      2 options {
      3   language = Python;
      4 }
      5 
      6 @init {
      7 self.cond = True
      8 }
      9 
     10 @members {
     11 def recover(self, input, re):
     12     # no error recovery yet, just crash!
     13     raise re
     14 }
     15 
     16 r
     17     : ( {self.cond}? NAME
     18         | {not self.cond}? NAME WS+ NAME
     19         )
     20         ( WS+ NAME )?
     21         EOF
     22     ;
     23 
     24 NAME: ('a'..'z') ('a'..'z' | '0'..'9')+;
     25 NUMBER: ('0'..'9')+;
     26 WS: ' '+;
     27