[antlr-interest] ASTFactory.dup*

Ric Klaren klaren at cs.utwente.nl
Thu Dec 27 05:27:36 PST 2001


On Sun, Dec 23, 2001 at 01:52:22PM -0800, Terence Parr wrote:
> > I just learned yesterday, that the dup* methods don't work as expected, 
> > if you
> > use various types of AST nodes and cannot set the default AST type 
> > therefore.
> > They return a CommonAST node, instead of the typ, that is passed to 
> > them. I've
> > already found a workaround for me, but maybe using some clone() method 
> > in the
> > dup* methods would be better?
> Ouch.  Good point.  dup should pay attention to types...hmmm...I wonder 
> how that can be made efficient.  Oh, each heterogeneous AST node must 
> define dup or clone or whatever.

You might have a look at the astfactory stuff in C++ mode, that does now
mostly the right thing. This is one of the reasons why that stuff should be
ported to java mode as well....

    ---- Ric Klaren ----- klaren at cs.utwente.nl ----- +31 53 4893722  ----
     Human beings, who are almost unique in having the ability to learn
   from the experience of others, are also remarkable for their apparent
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