[antlr-interest] C++ doesn't like my tokens ...

[Noel F Bryson]

NULL isn't actually a keyword in C++. It's a macro defined in one of the
header files, for convenience. You could put a #undef NULL in the ANTLR
header section ....

On Mon, 2004-07-05 at 15:29, Anthony Youngman wrote:
> Hi Ric,
> 
> Not sure how to deal with this ... I've got the following tokens in my
> lexer:
> 
> tokens {
> // statements
> 	CALL="CALL";
> 	CALLING="CALLING";
> 	DEFFUN="DEFFUN";
> 	ELSE="ELSE";
> 	END="END";
> 	EXIT="EXIT";
> 	FUNCTION="FUNCTION";
> 	GOTO="GOTO";
> 	IF="IF";
> 	INPUT="INPUT";
> 	LOOP="LOOP";
> 	NULL="NULL";
> 	PRINT="PRINT";
> 	PROGRAM="PROGRAM";
> 	REPEAT="REPEAT";
> 	RETURN="RETURN";
> 	SUBROUTINE="SUBROUTINE";
> 	THEN="THEN";
> 	UNTIL="UNTIL";
> 	WHILE="WHILE";
> // operators
> 	LOGIC_EQ="EQ";
> // descriptors
> 	COMMENT;
> 	LABEL;
> 	MATFUNC;
> // functions
> }
> 
> Which gives me a TokenTypes.hpp as attached. Note the line "NULL = 15,"
> - this causes g++ to blow up pretty badly.
> 
> Obviously my keyword is being treated as a C++ keyword. I would guess,
> as a temporary measure I can manually mangle the keyword, but are there
> any other keywords that are likely to blow up? And if so, how do we
> handle it? Should Antlr do a little mangling of all keywords for
> safety's sake?
> 
> Cheers,
> Wol
> 
>  <<BASICTokenTypes.hpp>> 
> 
> 
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