Re: how to create additional to CST attribute in AST ?

[Viktor Suvorov <viksuv@xxxxxxxxx>]

Thank you very much for such quick response !

I had to find this solution by myself

Best regards,
Viktor

--- Etienne Gagnon <egagnon@xxxxxxxxxxx> wrote:

> Hi Victor,
> 
> Yes, this is possible.  SableCC is rejecting "NULL"
> because the id
> element is not optional.  You simply need to make it
> optional:
> 
> lib_elem =
>   {program} [name]:tk_identifier [id]:tk_identifier?
> ;
> 
> (Note the additional "?")
> 
> SableCC does check that CST->AST transformations
> match the
> "multiplicity" of elements (not optional, "?", "*",
> and "+").
> 
> Have fun!
> 
> 
> Etienne
> 
> Viktor Suvorov wrote:
> > I want to add attribute into AST class, which have
> no
> > relation to grammar. This attribute will be filled
> > during semantic analyses stage. 
> >... 
> > I would like to add additional field "id" which
> can
> > store "tk_identifier" to production lib_elem in
> AST:
> > 
> > lib_elem = {program} [name]:tk_identifier
> > [id]:tk_identifier
> > ;
> > 
> > Is it possible to modify CST production lib_elem
> in
> > such way, that grammar would be valid ?
> Constructions
> > like 
> > 
> > lib_elem {-> lib_elem} = tk_program
> > [name]:tk_identifier tk_endprogram {-> New
> > lib_elem.program(name, Null)}
> > ;
> > 
> 
> -- 
> Etienne M. Gagnon, Ph.D.           
> http://www.info2.uqam.ca/~egagnon/
> SableVM:                                      
> http://www.sablevm.org/
> SableCC:                                      
> http://www.sablecc.org/
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>
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> 



 
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