[antlr-interest] replacing NoViableAltException with exception with less stack

[Loring Craymer]

Exceptions are a fact of life for grammars with
synpreds.

--Loring

--- Randall R Schulz <rschulz at sonic.net> wrote:

> On Monday 10 September 2007 12:43, Jochen Theodorou
> wrote:
> > Hi,
> >
> > we (Groovy team) have currently several
> performance problems with our
> > grammar. The resulting Parser is a bit too slow
> for our needs and we
> > are now looking for a way to make it faster. The
> grammar is a big and
> > complicated beast and I am sure there are many
> places we can make it
> > better.
> >
> > But one thing that would speed up the whole thing
> a little is to
> > remove that stack trace used by the
> NoViableAltException.
> 
> Do I understand you to be saying that the grammar
> used by Groovy 
> routinely produces these exceptions even for
> grammatically acceptable 
> input? If so, why? If not, then it cannot be a
> source of excessive 
> overhead.
> 
> 
> > ...
> >
> > Note: atm antlr 3.0 is no option
> 
> Eh? Why not?
> 
> 
> > thanks, blackdrag
> 
> 
> Randall Schulz
> 



       
____________________________________________________________________________________
Yahoo! oneSearch: Finally, mobile search 
that gives answers, not web links. 
http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC