[antlr-interest] keywords
Abhijit Nandkumar Ghonge
Abhijit_Ghonge at infosys.com
Thu Aug 3 05:37:45 PDT 2006
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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