[antlr-interest] Excluding keywords

[Avid Trober]

I saw something close to my problem on the wiki, http://www.antlr.org/pipermail/antlr-interest/2006-June/016563.html

But, I've got an "extra rule", filter.  Must I resort to an action, or is there a way to do this purely in the grammar file?


filter : // identifier, but *not* a keyword
              ;
    

keyword :  APPLY
              | BROWSE
              | CLOSE
              | OPEN
        ;

identifier : ('A'..'Z' | 'a'..'z') ('A'..'Z' | 'a'..'z' | '0'..'9' | '_')*
             ;


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