[antlr-interest] Please help with arbitrary arrangements and
oldBNF syntax
Matt Benson
gudnabrsam at yahoo.com
Fri Dec 16 13:08:58 PST 2005
well, except that, even after my fix, it's probably
much more complicated with the other elements in
Brannon's original example... the part that I skimmed
originally. ;)
-Matt
--- Geir Ove Skjaervik <geiroves at online.no> wrote:
> Hello,
>
> Neat ! Surely more elegant than my solution :-)
>
>
> Geir Ove
>
> -----Original Message-----
> From: antlr-interest-bounces at antlr.org
> [mailto:antlr-interest-bounces at antlr.org] On Behalf
> Of Matt Benson
> Sent: 16. desember 2005 21:34
> To: Brannon King; antlr-interest at antlr.org
> Subject: Re: [antlr-interest] Please help with
> arbitrary arrangements
> and oldBNF syntax
>
>
> Also, when you have a set as small as three, you
> could
> use this non-scaling approach:
>
> test
> : ( foo (bar (baz)? | baz)?
> | bar (foo (baz)? | baz)?
> | baz (foo (bar)? | bar)?
> )?
> ;
>
> FWIW,
> Matt
>
> --- Brannon King <BBKing at starbridgesystems.com>
> wrote:
>
> > Suppose I have the following parser rule snipped
> > from edif.org:
> >
> > written :
> > LP! "written"
> > timeStamp
> > ( < author > | < program > | < dataOrigin >
> |
> > property | comment | userData )*
> > RP!;
> >
> > Where the angle brackets mean that those can only
> > appear once (in an
> > arbitrary order). How do I enforce this in an
> ANTLR
> > grammar?
> >
> > In a similar vein, is this the right way to limit
> an identifier
> > length?
> >
> > IDENTIFIER
> > options {testLiterals=true;} //make sure it's not
> a
> > built in
> > function
> > : (ALPHA|'&') a:('_'|ALPHA|DIGIT)*
> > {a.getText().length() < 256}? ; //less than 256
> > chars total
> >
> > Thanks for your time
> >
>
>
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