[antlr-interest] Re: syn pred implementation

lgcraymer lgc at mail1.jpl.nasa.gov
Wed Mar 10 13:30:53 PST 2004


I certainly agree on exceptions for errors--that's an ergonomic issue since error codes are rarely checked--whether they are set in 
errno (C) or are returned from functions--if an operation normally succeeds.

--Loring


--- In antlr-interest at yahoogroups.com, Terence Parr <parrt at c...> wrote:
> Heh great ideas everybody!
> 
> I will definitely explore this option.  I like having a single style of 
> code gen that will work on all algol derivatives so exception-based 
> implementations ain't so good.  I just have to look at it some more.
> 
>  From a grammar user perspective, however, I think exceptions for errors 
> is a major leap over other stuff.  Perhaps we can just make it look 
> like you have exceptions but under the hood it's a bunch of IFs and 
> such.
> 
> I wonder what LISP and ML will do.  Hmm...
> 
> Oh, the old C-code generator for PCCTS used longjmp for predicates ;)
> 
> Ter
> --
> Professor Comp. Sci., University of San Francisco
> Creator, ANTLR Parser Generator, http://www.antlr.org
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