Hello, I do something similar in matrix-glib-sdk[1]: I get one specific key from a JSON object, and based on that key I create different types of objects. For that I have a type registry, which tells me what objects must be created for what event type.
Your GtkBuilder approach also looks nice, although GTK would be a too heavy dependency for my project. Best, Gergely [1] https://github.com/gergelypolonkai/matrix-glib-sdk/blob/develop/src/matrix-event-base.vala On Mar 21, 2016 10:37 PM, "Alan Manuel Gloria" <almkg...@gmail.com> wrote: > Yes, that's what I thought too. > > However, looking at GtkBuilder's source code, it has a function called > type_name_mangle which converts a name like "GtkButton" to > "gtk_button_get_type", then uses GModule to load that function. Vala's C > generation seems to create a function of the same/similar naming > convention, so the equivalent of typeof(Weapon) in C is weapon_get_type(). > > As a sketch, I suppose something like this ought to work: > > [CCode (has_target=false)] > private delegate Type TypeOf(); > ... > var module = Module.open(null, 0); // opens the program itself instead of > a different module > TypeOf get_type; > module.symbol("weapon_get_type", (void*) &get_type); // the real program > needs to generate the name and check the return value here > Type type = get_type(); > > Object obj = Object.create(type, "damage", 10); > ... > > > On Tue, Mar 22, 2016 at 2:19 AM, Felipe Lavratti <felipe...@gmail.com> > wrote: > >> 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 <gerg...@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" <almkg...@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 >>> > _______________________________________________ >>> > vala-list mailing list >>> > vala-list@gnome.org >>> > https://mail.gnome.org/mailman/listinfo/vala-list >>> > >>> _______________________________________________ >>> vala-list mailing list >>> vala-list@gnome.org >>> https://mail.gnome.org/mailman/listinfo/vala-list >>> >> > _______________________________________________ vala-list mailing list vala-list@gnome.org https://mail.gnome.org/mailman/listinfo/vala-list
