[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.
Monty
> -----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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