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Bug#636493: cudf: Empty lists as default value in typedecl



On Wed, Aug 03, 2011 at 10:47:24PM +0200, Ralf Treinen wrote:
> Hi Andreas,
> 
> On Wed, Aug 03, 2011 at 02:54:53PM +0200, Julian Andres Klode wrote:
> > Package: cudf
> > 
> > I'd like to define something like:
> > 
> > property: 
> >  recommends: vpkgformula = [] ,
> > 
> > But it seems that this is not supported. I did not completely
> > read the specification, but I believe that there should be an
> > option to define the empty list as the default value.
> 
> The type of recommends is vpkgformula, that is logical formulas and
> not lists. This type has special values "true!" and "false!" (without
> the quotes).  Note the exclamation point which distinguishes these from
> the constants of type bool. The reason why we did not support the
> empty list as a constant is that this would be ambiguous: it could be
> an empty disjunction (=false) or an empty conjunction (=true).
Would this work for vpkglist as well?

> 
> If you want to say that a package by default has no recommends then you
> should write:
> 
> property:
>  recommends: vpkgformula = true!
Results in
 loading package universe ...
 Error while parsing universe: a value of type "typedecl" was expected, but "recommends: vpkgformula = true!" has been found
 Location: lines: 2-3

Bug in the CUDF parser?

-- 
Julian Andres Klode  - Debian Developer, Ubuntu Member

See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.

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