Re: [Vala] Inspecting class hierarchy

[Felipe Lavratti <felipelav gmail com>]

Hello, this is the minimum workaround I found to work, there might be a
simpler way of forcing the registration of non-literally used classes in
the GObject system.

public class Weapon : Object {
  public uint damage { get; construct; }
}

int main () {

    /* Force class registration here, comment this line to see the
execution failing. */
    var klass = typeof(Weapon);

    Type WeaponType = Type.from_name("Weapon");
    Object weapon = Object.new(WeaponType, damage: 10);

    GLib.message("weapon.damage = %u", (weapon as Weapon).damage);

    return 0;
}


On Mon, Mar 21, 2016 at 10:47 AM Gergely Polonkai <gergely polonkai eu>
wrote:

> Hello,
>
> for the first sight your format looks verybsimilar to key-value files
> already supported by GLib:
>
> https://developer.gnome.org/glib/stable/glib-Key-value-file-parser.html
> http://valadoc.org/#!api=glib-2.0/GLib.KeyFile
>
> Are you sure it won't work for your problem? If it would, you may want to
> subclass it.
>
> Best,
> Gergely
> On Mar 21, 2016 2:26 PM, "Alan Manuel Gloria" <almkglor gmail com> wrote:
>
> > Hi Vala world,
> >
> > I'm trying to make some kind of description loader.  I have a base class
> > like so:
> >
> > class Concept : Object {
> >   string name { get; construct; }
> >   string desc { get; construct; }
> > }
> >
> > And one or more classes, e.g.:
> >
> > class Component : Concept {
> >   uint size { get; construct; }
> >   uint cost { get; construct; }
> > }
> > class Weapon : Component {
> >   uint damage { get; construct; }
> > }
> >
> > My goal is to parse some text file like so:
> >
> > [Blaster I]
> > type = Weapon
> > desc = A simple blaster.
> > size = 20
> > cost = 200
> > damage = 1
> >
> > Then the parser class will provide a collection of Concept objects
> > indexable by name and type.
> >
> > My question is, how do I best do this?  Gtk.Buildable seems to
> approximate
> > what I want, so I suppose I need to figure out how that works.
> >
> > My initial research seems to suggest that I need to use GLib.Type
> somehow,
> > but my understanding is that the exact type does not get created until it
> > is used.  It seems to me that I'd need code like:
> >
> > var p = new MyTextFileParser();
> > p.register(typeof(Component));
> > p.register(typeof(Weapon));
> > // ... and so on ...
> >
> > Thanks in advance.
> >
> > Sincerely,
> > AmkG
> > _______________________________________________
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