[antlr-interest] A postmortem of my use of antler

[Darien Hager]

On 3/11/08, Guntis Ozols <guntiso at latnet.lv> wrote:
>
> > >> how could ANTLR *possibly* know the structure of the AST to build
> > >> except for, perhaps, expressions? parse tree, yes. AST, no.
> > > How about have the AST just match the parse tree by default?
>
> > Because then you add one ^ or -> rewrite and what should it do?  Give
> > you a hybrid?  That just wouldn't be useful.  If you want a parse tree
> > use it.
>
> How about enabling ^ on the left side?
> ^rule : stuff;
> could be very nice shortcut for
> tokens {
>   RULE;
> }
>

Is the shortcut worth it? Clarity is arguably more important than brevity
when it comes to grammars.

It might make more sense to deal with this on a "tools" level.  E.g. a
right-click option in ANTLRWorks to "generate rewrite rule for block" which
would default to an AST resembling the parse tree.

-- 
Darien Hager
Developer
Etelos, Inc.
darien at etelos.com

http://www.etelos.com
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