[antlr-interest] scoped variable not being passed

[Warner Onstine]

I'll have to review that again to be sure, but I believe I added that
in afterwards (it wasn't working before I had that scope prog; there,
I added it to see if that would get it working).  But I'll try that
just in case.

-warner

On 9/3/07, Thomas Brandon <tbrandonau at gmail.com> wrote:
> You should only declare a scope when you want a rule to create a new
> scope object on the stack. So, for dynamic scopes you generally
> shouldn't have any scope clauses apart from the initial definitions.
> Code like:
> selectStatement
> scope prog;
>         :       'Select' '(' ')' criteria=criteriaBlock? ->
> select_statement(crit={criteria != null ? $criteria.st : null},
> model={$prog::className})
>         ;
> will cause a new prog scope object to be created on the stack and
> removed when the rule exits, so your changes below that method will
> all be lost.
> If you remove all such scope use declarations I think your code should work.
>
> Tom.
>
> On 9/4/07, Warner Onstine <warnero at gmail.com> wrote:
> > Never did hear from anyone on this issue, is this doable? I've tried a
> > couple of different things I thought might work but yielded the same
> > result.
> >
> > -warner
> >
> > On 8/29/07, Warner Onstine <warnero at gmail.com> wrote:
> > > Ok, next to last question (I have one nagging grammar generation
> > > question left, but want to get this one fixed before I pose it). I
> > > have a prog scope variable (prog is one of the first matches which
> > > I'll show below), I want to reference this variable in a later match
> > > but it isn't being passed along and I'm not sure what I need to do to
> > > get it to pass correctly.
> > >
> > > Here's where it is declared:
> > > prog
> > > scope {
> > >   List methods;
> > >   List imports;
> > >   String className;
> > > }
> > > @init {
> > >   $prog::methods = new ArrayList();
> > >   $prog::imports = new ArrayList();
> > >   $prog::className = new String();
> > > }
> > >         :       packageDecl importsDecl? model ->
> > > prog(packageName={$packageDecl.st}, imports={$prog::imports},
> > > className={$prog::className}, methods={$prog::methods})
> > >         ;
> > >
> > > The variable I want to reference is $prog::className and I want to
> > > reference it in my later statements (which I think are under the
> > > method scope), here is where the method scope is declared later.
> > >
> > > method
> > > scope  {
> > >   List localVars;
> > > }
> > > @init {
> > >   $method::localVars = new ArrayList();
> > > }
> > >         :       returnType=type? name=ID '(' p=parameter? ')' '{' methodBody=body? '}'
> > >                 -> method(returnType={returnType != null ? $returnType.st : new
> > > String("void")},
> > >                           name={$name.text},
> > >                           param={p != null ? $p.st : new String("")},
> > >                           body={methodBody != null ? $method::localVars : null})
> > >
> > >         ;
> > >
> > > And I want to use the className variable here:
> > >
> > > criteriaBlock
> > >         :       '{' ID_EQUALS '(' ID ')' '}' -> id_eq(id={$ID.text},
> > > model={$prog::className})
> > >         ;
> > >
> > > Again, I've attached the grammar for reference.
> > >
> > > -warner
> > > --
> > > Warner Onstine - Programmer/Author
> > > New book on Tapestry 4!
> > > Tapestry 101 available at
> > > http://sourcebeat.com/books/tapestrylive.html
> > > warner at warneronstine.com
> > > http://warneronstine.com/blog
> > >
> > >
> >
> >
> > --
> > Warner Onstine - Programmer/Author
> > New book on Tapestry 4!
> > Tapestry 101 available at
> > http://sourcebeat.com/books/tapestrylive.html
> > warner at warneronstine.com
> > http://warneronstine.com/blog
> >
>


-- 
Warner Onstine - Programmer/Author
New book on Tapestry 4!
Tapestry 101 available at
http://sourcebeat.com/books/tapestrylive.html
warner at warneronstine.com
http://warneronstine.com/blog