[antlr-interest] Re: Antlr grammar to parse Java classfile?

[Andreas Rueckert]

Hi!

On Mit, 05 Dez 2001 Terence Parr wrote:

--<snip>--

> Let's see.  Well, it's close, but it wouldn't give you an error if you 
> have less than blockCount.  You need that "did I get enough" check at 
> the end of the loop.  Could do with a simple "validating" sem pred after 
> loop.

Thanks a lot for your help. I'd also like to thank Monty for his posting of the
sources. When I saw them, I realized that the counter decrement could
(hopefully) also be done in the predicate itself. When I add your validating
predicate, my current rule to read the constant pool of a classfile looks like:
=======================================
// The constant pool.
constant_pool
{ int poolSize=0; }
	: poolSize=constant_pool_count                   // Parse the size of the constant pool + 1
	  ( {--poolSize > 0}? cp_info )* {poolSize==0}?  // Parse (poolSize-1) cp_info structures.
	;
=======================================

It should hopefully read counter/poolSize-1(!) cp_info structures, if the pred
decrement works as I expect. And I think it really doesn't look like a nasty
hack, or so.

Thanks to all those, who commented and helped me.

BTW: You asked for my target language, but I was in a hurry and overlooked your
question at that time (sorry!). I'm working on a ArgoUML module and Argo is
written in Java, so I'm interested in a Java parser for classfiles. 

Ciao,
Andreas

 

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