[antlr-interest] keywords

[Abhijit Nandkumar Ghonge]

Hi,

            I'm a newbie in Antlr. I have a grammer that uses keywords
like if , while and so on . But all of these are case insensitive. If I
directly use these in my parser as literals, can they be case
insensitive.

            Right now I have defined the keywords in the lexer with
options caseSensitive set to false. E.g



options{

       k = 6;

    testLiterals = false;

    caseSensitive = false;

    caseSensitiveLiterals = false;

    charVocabulary = '\3'..'\377'; // extended ASCII (3-255 in octal
notation)

}





 /*================LANGUAGE STRUCTURE===================*/



ENDIF  :      "endif" ;



THEN   :      "then" ;



ELSE   :      "else" ;



WHILE  :      "while" ;



IF            :      "if" ;



DO            :      "do" ;



GOTO   :      "goto" ;



PRINT  :      "print"       ;



       But the problem is that, the antlr cannot differentiate between
the keywords and the LITERAL token defined:



protected

VALID_ID_CHARS options { testLiterals = true;}

       :      ('a'..'z' | '_')

       ;



protected

CHARLITERAL options { testLiterals = true;}

       :      ('a'..'z' | '_' | '0'..'9' |'@'| '$')

       ;





LITERAL     options { testLiterals = true;}

      :     VALID_ID_CHARS (CHARLITERAL)*

      ;



Can I use my keywords as literals directly in the parser and still
manage to make them case insensitive. Please help.



Abhijit.



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