1 grammar Poly; 2 options { 3 output=AST; 4 language=ObjC; 5 } 6 tokens { MULT; } // imaginary token 7 8 poly: term ('+'^ term)* 9 ; 10 11 term: INT ID -> ^(MULT[@"*"] INT ID) 12 | INT exp -> ^(MULT[@"*"] INT exp) 13 | exp 14 | INT 15 | ID 16 ; 17 18 exp : ID '^'^ INT 19 ; 20 21 ID returns [NSString *value] 22 : 'a'..'z'+ ; 23 24 INT returns [NSString *value] 25 : '0'..'9'+ ; 26 27 WS : (' '|'\t'|'\r'|'\n')+ { $channel=HIDDEN; } ; 28
