This slightly adjusted grammar works for me. Tested on input 1+1-1||1*1-1/1
. Tested in ANTLRWorks2.1
grammar myGrammar;
top : expr EOF ;
expr : '1'
| expr '+' expr
| expr '*' expr
| expr '/' expr
| expr '+' expr
| expr '-' expr
| expr '||' expr
;
WS :[ \t\r\n]+ -> skip ;
One : '1' ;
Times : '*' ;
Div : '/' ;
Plus : '+' ;
Minus : '-' ;
Or : '||' ;
EDIT
I was able to get this to work, too, when matching the rule top
:
grammar newEmptyCombinedGrammar;
top : expr EOF ;
expr: one
| expr op=(Times|Div|Plus|Minus|Or) expr
;
one : One ;
One : '1' ;
Times : '*' ;
Div : '/' ;
Plus : '+' ;
Minus : '-' ;
Or : '||' ;
WS :[ \t\r\n]+ -> skip ;