[antlr-interest] Re: comment must be preceded by whitespace
lgcraymer
lgc at mail1.jpl.nasa.gov
Wed Mar 17 16:41:00 PST 2004
Take out the '\n', then--that's the only thing apart from EOF that can follow _~'\n)*.
--Loring
--- In antlr-interest at yahoogroups.com, "charlesskelton" <c.skelton at s...> wrote:
> Nice idea, but ynfortunately not - I need the \n to return as a
> token by itself.
>
> Any other suggestions?
>
> Thanks,
> Charlie
> --- In antlr-interest at yahoogroups.com, Terence Parr <parrt at c...>
> wrote:
> > On Mar 17, 2004, at 3:45 PM, charlesskelton wrote:
> >
> > > I'm new to antlr.
> > >
> > > I'm trying to write lexer for a language, k, in which single line
> > > comments begin with a '/'. If there is no whitespace before
> the '/',
> > > or the '/' is not in column 1, then it is not a comment.
> >
> > Try
> >
> > comment : {getColumn()==1}? '/' (~'\n')* '\n' {newline();} ;
> >
> > would that work?
> >
> > Ter
> > --
> > Professor Comp. Sci., University of San Francisco
> > Creator, ANTLR Parser Generator, http://www.antlr.org
> > Cofounder, http://www.jguru.com
> > Cofounder, http://www.knowspam.net enjoy email again!
> > Cofounder, http://www.peerscope.com pure link sharing
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