[antlr-interest] simple question on V2 grammar

[Nagesh, Harsha]

Hi - Can anybody please help me in this simple grammar ?
 
My language consists only of Letters (a..z) and a few tokens ("and", "or"). I am trying to match an expression "A and B" using the following
 
Parser
---------
myOp:
            atom (AND atom)*
       ;
 
atom: Letter
        ;
 
Lexer
-------
 
tokens { AND = "and";}
Letter: 'a'..'z'
 
 
When I feed the expression "A and B" to this, the parser fails. The second token, Instead of matching with AND, matches with Letter and thus fails....I am not sure how can I fix this ? I tried to use syntactic predicate 
 
myOp:
            (atom AND) => atom (AND atom)*
       ;
 
but antlr ignored it when generating the code saying that syntactic predicate not required when only one alternative exists...
 
Can anybody please help
 
Thanks
Harsha
 

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