On Sun, 8 Jan 2012 06:53:04 +1000 David Seikel <onef...@gmail.com> wrote:
> On Sun, 8 Jan 2012 01:55:49 +1000 David Seikel <onef...@gmail.com> > wrote: > > > On Fri, 6 Jan 2012 20:32:30 +0900 Carsten Haitzler (The Rasterman) > > <ras...@rasterman.com> wrote: > > > > > On Thu, 5 Jan 2012 23:38:55 +1000 David Seikel <onef...@gmail.com> > > > said: > > > > > > > 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 - > > > > > > i know. right now it can be a simple "needs version X of edje". > > > for api that is transient (may or may not be provided by app > > > loading edje file)... it's a different matter :) > > > > It's a different problem, but solving the general case solves them > > both. B-) > > > > > > > > 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? > > > > > > well if we can have these calls safely return nils and not have > > > lua barf entirely... that'll be good ;) > > > > That's what I'll work on then. > > I put a metatable on nil. Works beautifully. Even the ancient > edje.spanky() code you put in a long time ago triggers it. An error > message is printed, the non existent function returns nil, and the > script keeps running. > > This will work for people using themes with new API on an old library > (images on the old release, textblocks on the current release if they > are added to the next release), using new functions on old API (for > instance, if we add an edje.textblock() function in the future, but > someone uses it with an old library), and host app provided API if not > running under the host app that provides it (which I will add > soonish). I'll commit as soon as I can get past this - svn: Commit failed (details follow): svn: Network connection closed unexpectedly All the rest of my 'net is working fine, including email obviously. -- 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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