[antlr-interest] Re: Possible bug in subrule invertion

micheal_jor open.zone at virgin.net
Fri Apr 9 10:56:40 PDT 2004


--- In antlr-interest at yahoogroups.com, "Tom Zagotta" <tzagotta1 at s...>
wrote:
> 
> > If this is in the lexer, you cannot invert "rules" such as 
> > LINE_FEED.  
> > Done on purpose, I'm afraid. ;)
> 
> In this case, LINE_FEED would be best defined as a macro, which
> unfortunately is not supported by ANTLR.  Macros (or something
functionally
> equivalent or better) would be a nice addition for helping to build up
> lexers from smaller parts.

I hope ANTLR's input doesn't get so weak that it requires macro
preprocessing ;-)

Tom, can you give a small example of how you might use this macro to
do what you intended?

Cheers,

Micheal




 
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