[antlr-interest] Please help with arbitrary arrangements and old BNF syntax

[Matt Benson]

oh, actually, I guess that'd have to be:

test
  :  (  foo (bar (baz)? | baz (bar)?)?
     |  bar (foo (baz)? | baz (foo)?)?
     |  baz (foo (bar)? | bar (foo)?)?
     )?
  ;

Definitely wouldn't want to take this much past
three... ;)

-Matt

--- Matt Benson <gudnabrsam at yahoo.com> wrote:

> 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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