[antlr-interest] New user

[mzukowski at yci.com]

I'm not sure what the transmorgify framework does, but if it isn't handling
the COMMENTs  then you have to.  Typically COMMENTs are put along side of
nodes (as an attribute or instance variable of a node) instead of inserted
into the actual tree, because if they are in the tree itself then they have
to be accounted for in the grammar, which is messy for comments because
those can be anywhere.

Monty

> -----Original Message-----
> From: Matt Benson [mailto:gudnabrsam at yahoo.com]
> Sent: Thursday, August 29, 2002 2:59 PM
> To: antlr-interest at yahoogroups.com
> Subject: Re: [antlr-interest] New user
> 
> 
> As promised, I have come up with a question!  :)
> 
> Now, so we know, my interest in Antlr is, thus far,
> restricted to java.g.  Right now I am interested in
> comments.  I am parsing a Java file with both single
> and multiline comments, and running it through a
> TokenStreamHiddenTokenFilter using my own modified
> version of the Transmogrify framework.  I have
> disabled the code that sets SL_COMMENT and ML_COMMENT
> to be hidden in the TokenStreamHiddenTokenFilter;
> however I still cannot see them when I display my
> syntax tree using an ASTFrame.  Does anyone have any
> clue why?
> 
> Sorry for the too-specific problem... :)
> 
> -Matt
> 
> 
> --- Matt Benson <gudnabrsam at yahoo.com> wrote:
> > I had pretty much determined the meanings of ()* and
> > ()+  but what, then, is the origin of the terms
> > "closure subrule" and "positive closure subrule" ? 
> > Have I just not read enough yet?  :)
> > 
> > Anyway, I just upgraded to the newer version and it
> > seems to have solved my compilation problem. 
> > Tomorrow
> > I'll probably come up with more!
> > 
> > Thanks a lot,
> > Matt
> > 
> > --- Terence Parr <parrt at jguru.com> wrote:
> > > 
> > > On Wednesday, August 28, 2002, at 02:13  PM, Matt
> > > Benson wrote:
> > > 
> > > > I had looked in the FAQ and seen the relevant
> > > article.
> > > >  I had not seen the Getting started with Antlr
> > > > article.  I guess my biggest problem is unifying
> > > the
> > > > table in the manual that shows the punctuation
> > and
> > > > keywords with English descriptions. 
> > Understanding
> > > the
> > > > difference between a subrule, a closure subrule,
> > > and a
> > > > positive subrule seems like something that's
> > only
> > > > going to come with much perusal of the
> > > documentation,
> > > > or more education in the field of parsing in
> > > general.
> > > 
> > > Ah.  well a subrule just lets you put alternatives
> > > in-line instead of 
> > > making another rule like this:
> > > 
> > > a : A (B|C) ;
> > > 
> > > The "(...)*" closure means zero more times around
> > > the loop and (...)+ 
> > > means at least once :)
> > > 
> > > >
> > > > The biggest problem I am facing at the moment is
> > > this:
> > > >  if I run Antlr on the latest java.g from John
> > > Pybus
> > > > via the ant-interest list, its declared
> > > charVocabulary
> > > > fills JavaLexer.java with various unicode/octal
> > > escape
> > > > sequences that will not compile with Sun's javac
> > > for
> > > > either 1.3 or 1.4.  I get various "empty
> > character
> > > > literal", "unclosed character literal", and
> > > "illegal
> > > > unicode escape" errors.  I am using Antlr 2.7.1.
> > 
> > > Do I
> > > > need to upgrade to the new alpha?
> > > 
> > > Yup...the 2.7.2a2 release (nearly the final thing)
> > > will fix lots of 
> > > that.
> > > 
> > > Ter
> > > 
> > > 
> > >  
> > > 
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> > > 
> > > 
> > 
> > 
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