[antlr-interest] error messages + treeParser with OR'ed root
ewbank at gmail.com
Fri Mar 18 10:34:26 PST 2005
I've also had some limited success with using predicates to fake it out:
(PLUS|MINUS|STAR|DIV) => #( op:. lType = expr rType = expr)
// op will be one of the four
On Fri, 18 Mar 2005 09:24:34 -0500, Monty Zukowski
<monty at codetransform.com> wrote:
> > Second problem has to do with an root in walker that is OR'ed.
> > #( (PLUS|MINUS|STAR|DIV) lType = expr rType = expr)
> > gives an error of unexpected token '('.
> > Any idea how I can fix this?
> Currently ANTLR cannot have OR'd roots. You'll have to do something like
> #(PLUS expr expr)
> | #(MINUS expr expr)
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