[antlr-interest] Re: How do I specify start-of-line (^ in [F] Lex in ANTLR Lexers?

mzukowski at yci.com mzukowski at yci.com
Wed May 29 11:49:48 PDT 2002

For syntax aware preprocessors for java that are in development see
www.brics.dk/metafront and one using antlr
http://www.ai.mit.edu/~jrb/jse/index.htm.  I don't think either are released
yet but they look promising.


> -----Original Message-----
> From: jsrs701 [mailto:jsrs701 at yahoo.com]
> Sent: Wednesday, May 29, 2002 11:45 AM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] Re: How do I specify start-of-line (^ in
> [F]Lex in ANTLR Lexers?
> --- In antlr-interest at y..., "clinton_olsen" <clinton_olsen at y...> 
> wrote:
> > I'd like to qualify this with the fact that _any_ parser is 
> > typically not suited to to do a pre-processor.  This needs to be 
> > done in the lexer for the reasons stated by Greg.  
> Well, that does depend on what kind of preprocessor you're doing.
> One of these days, I'm gonna take a crack at rebuilding James 
> Gosling's ACE preprocessor using ANTLR.  ACE is not a character-
> stream preprocessor (the way the original cpp is), but a syntax tree 
> preprocessor.  (You can get more info on it at his homepage, 
> http://java.sun.com/people/jag/ .  I HIGHLY recommend EVERYONE on 
> this list read the paper; it is HIGHLY relevant to ANTLR.  After 
> seeing this, you'll want all of your preprocessors to operate on 
> syntax trees instead of character streams!)
> > Besides, you need 
> > the replaced input to be lexed before it can be passed to the
> > parser.
> It seems that that you're intending for the preprocessor to be 
> running in the same process as the final parser?  Why not just build 
> a separate preprocessor application, and shell out to it, the way cc 
> calls cpp?
> And really, for a character-stream preprocessor, ANTLR is probably 
> overkill.  Or is your preprocessor significantly more complex than 
> cpp?
> (Please note, C++ afficionados, that I'm referring to the C 
> PreProcessor when I say "cpp".)
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