[antlr-interest] TreeDL news: tutorial, new releases, mailing lists

[Tiller, Michael (M.M.)]

Alexey,

  I find this TreeDL system quite interesting.  It is closer to the way
I think than the typical homogeneous ASTs in ANTLR.  However, I see a
couple of issues when comparing it to things I've done:

1) I notice that you do not utilize Generic collections (ala Java 1.5).
Is this something you are considering adding?  It would be a nice touch.

2) Your visitor pattern include "visitXYZ" methods.  I've found that for
many structures an "enterXYZ" and "leaveXYZ" pattern is more suitable.
In fact, one might argue that anything that has children would probably
benefit from the "enter-leave" pattern (also found in SableCC if I'm not
mistaken).  It doesn't matter for things like evaluation, but if you
want to output HTML (for example), it is nice.

3) I could not tell from the documentation but it seems that (at least
for children), you implement get methods.  Do you also implement set
methods?  Finally, are attributes handled similarly?  I like the
attributed tree idea, but I'd like some control over the get/set methods
(to allow for things like cache invalidation, for example).

4) I didn't see this explicitly stated in your calc example, but is the
interface for the visitor generated automatically?  If so, that is a
very nice touch.

5) It isn't clear what the purpose of the "Syntax Grammar" section is.
How is this used?  It seems like the tree definition + ANTLR grammar is
pretty complete.  I don't see what the .bnf file is needed for.

6) Your tree directive seems to be used to indicate what package the
eventual definitions will be included in.  Why not use the word
"package" instead of "tree".  To me, "tree" implies it has something to
do with the data structures themselves rather than just their location
in the package hierarchy.

Items #1-4 represent differences between TreeDL and the way I have been
approaching things.  I would be very interested in seeing how these
particular aspects of TreeDL evolve because I prefer your high-level
approach (so long as it includes the functionality I need).

Looks very interesting.  Please keep us posted.

--
Mike

> -----Original Message-----
> From: Alexey Demakov [mailto:demakov at ispras.ru]
> Sent: Wednesday, October 27, 2004 10:54 AM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] TreeDL news: tutorial, new releases, mailing
> lists
> 
> 
> Hi all,
> 
> For those of you who is interested in TreeDL (announced some time ago
in
> this list),
> I have good news :)
> 
> TreeDL (Tree Description Language) is a notation for description
> of formal text internal representation (such as abstract syntax tree).
> 
> 1. Step-by-step tutorial on TreeDL is available: How to create tool
that
> process simple language for calculator.
> http://treedl.sourceforge.net/examples/calc/
> 
> 2. Mail lists for users and developers are available:
> http://sourceforge.net/mail/?group_id=120633
> If you are interested in TreeDL, please, subscribe, I really need your
> feedback.
> All further TreeDL discussion will be in these lists.
> 
> 3. New releases can be downloaded from project page
> http://sourceforge.net/projects/treedl/
> treedl-1.0-rc2
> atplib-3.0-rc2
> maven-atp-plugin-rc2
> maven-treedl-plugin-rc3
> 
> Regards,
> Alexey
> 
> -----
> Alexey Demakov
> TreeDL: Tree Description Language: http://treedl.sourceforge.net
> RedVerst Group: http://www.unitesk.com
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 



 
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