Re: "Eating" comments: not with Flex but with Bison

[Hans Aberg]

At 20:46 +0000 2005/06/13, Frans Englich wrote:
> I think I have a special scenario wrt. to comment handling: in one version of
> my language, comments are allowed while in another it is not. Hence,
> depending on version I want to flag the existence of comments as syntax
> errors, regardless of whether they are valid.

You could try to set a context switch in the lexer (see the Flex 
manual, "start conditions") on the comment lexing rule(s). Then this 
context switch can be turned on/off in various ways. For example, the 
lexer could be initiated (right after %% in the .l file) with 
checking a global variable doing this. This variable can be turned 
on/off from the parser.
--
  Hans Aberg