On Thu, 5 Jan 2012 16:43:29 +0900 Carsten Haitzler (The Rasterman) <ras...@rasterman.com> wrote:
> On Mon, 2 Jan 2012 21:09:19 +1000 David Seikel <onef...@gmail.com> > said: > > how will the lua be able to detect the api call is there safely > without totally ceasing functioning. That's a problem we will have to solve anyway. I said - > > Raster objected to this idea before, if I remember. His argument > > was, I think,"what if someone loads a Lua script theme that uses > > one of these new APIs, but they are not there?". We are gonna have > > that problem now, and with each subsequent release. Anyone running > > a theme that expects images, text, maps, and other stuff that I > > added to the last release, but using the edje release before, is > > gonna be sorely disappointed. It only had rectangles and timers. > > For the next release I expect to add textblock and sound support at > > least. (Glad I remembered your objection properly.) Since I plan to reuse the same infrastructure we already have, these new host app supplied functions will be in a table+metatable created to hold them. Like the existing image table+metatable and evas image functions that it holds. So just like an edje Lua script could now call - image.filled(true) and work fine with the current edje release, but fail on the previous release. In the future it could call - daves_funky_app.some_function(foo, "bar") or - textblock.textblock() or even - elementary.box() If they are using the current edje release, all are trying to use non existent API. So the same thing should happen in all cases. I think we can add a metatable to the environment, and use the usual mechanism for handling access to non existent data. That's what I'll be experimenting with to solve the problem for all cases. Once edje can safely detect the use of an undefined object, it should bitch, ignore any effort to call one of it's methods, and carry on. Actually, if I remember, any unassigned variable has the nil value, so perhaps we can add a metatable to that? -- A big old stinking pile of genius that no one wants coz there are too many silver coated monkeys in the world.
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