[antlr-interest] exceptions in the lexer

matthew ford Matthew.Ford at forward.com.au
Tue Dec 7 02:24:02 PST 2004


Well JEdit catches this and recovers.
Why can't I?
matthew

----- Original Message ----- 
From: "Harald Mueller" <harald.m.mueller at bigfoot.com>
To: <antlr-interest at yahoogroups.com>
Sent: Tuesday, December 07, 2004 8:48 PM
Subject: Re: [antlr-interest] exceptions in the lexer


>
> >
> > Hey, Just extend you user-defined exceptions from RuntimeException and
> > throw
> > them.
>
> He explicitly didn't want to do this - but I also do it (using a
> WrappingRuntimeException which I need at other places anyway (e.g. for the
> Runnable.run() method)).
>
> > You catch all your RuntimeExceptions don't you?
> > Remember OutOfMemoryException is not necessarly fatal.
>
> This is not an Exception, but an Error - you would never catch this.
>
> Regards
> Harald M. Müller
>
> > matthew
> > ----- Original Message ----- 
> > From: "Paul J. Lucas" <pauljlucas at mac.com>
> > To: <antlr-interest at yahoogroups.com>
> > Sent: Tuesday, December 07, 2004 11:10 AM
> > Subject: Re: [antlr-interest] exceptions in the lexer
> >
> >
> > >
> > > On Mon, 6 Dec 2004, Terence Parr wrote:
> > >
> > > > Are you familiar with the filter option on the lexer grammar?
> > >
> > > Yes in the sense that I've read that bit of the documentation,
> > > but I've never used it.
> > >
> > > I don't want my entire lexer to be a filter since I need it to
> > > be a real lexer for a parser.
> > >
> > > My particular case at hand is dealing with pragmas that can
> > > appear anywhere comments can.  Since comments are most easily
> > > handled in the lexer, I handle pragmas there to for the same
> > > reason.  The problem is what to do if there's an error in a
> > > pragma.  The lexer can't throw user-defined exceptions.  (I
> > > might be able to work around it by hiding the real exception
> > > inside a Runtime exception, but that's ugly.
> > >
> > > - Paul
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
> -- 
> NEU +++ DSL Komplett von GMX +++ http://www.gmx.net/de/go/dsl
> GMX DSL-Netzanschluss + Tarif zum supergünstigen Komplett-Preis!
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>



 
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