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221. Re: Is Lua used as a data representation language? (score: 2)

Author: Robert Virding <robert.virding@...>

Date: Thu, 10 Jan 2013 01:05:23 +0000 (GMT)

Yes, there are really two issues (at least) which have been conflated here: the SYNTAX of the data representation and how it is to be "parsed". These are two separate issues. It seems like there is a

222. RE: Is Lua used as a data representation language? (score: 2)

Author: Dan Tull <dtull@...>

Date: Tue, 8 Jan 2013 09:59:42 -0800

Lightroom uses Lua as a data description language with sandboxing. It has crossed my mind on a few occasions to use the disassembly routine we use for some of our linting to provide another level of

223. Re: Lua as configuration language (score: 2)

Author: Tomas Guisasola Gorham <tomas@...>

Date: Fri, 4 Jan 2013 15:24:54 -0200 (BRST)

Hi Marc Have you checked ALua? ALua: flexibility for parallel programming, by C. Ururahy, N. Rodriguez, and R. Ierusalimschy. Computer Languages 28 #2 (2002) 155-180. ALua: an event-driven communicat

224. Re: Lua as configuration language (score: 2)

Author: Marc Balmer <marc@...>

Date: Fri, 4 Jan 2013 18:10:57 +0100

Am 04.01.2013 um 18:00 schrieb Alexander Gladysh <agladysh@gmail.com>: I agree. I just mentioned it because I found it an interesting use case. And many thanks for you other comments! - Marc

225. Re: Lua as configuration language (score: 2)

Author: Alexander Gladysh <agladysh@...>

Date: Fri, 4 Jan 2013 21:00:28 +0400

BTW: see [3] for details. While they have been used, it is not a sound practice, IMO. (1) Both client and server must trust each other (or pay heavy sandboxing toll), and (2) data deserialization is

226. Re: a few lua api questions:imbedding, object methods and object properties (score: 3)

Author: Rob Hoelz <rob@...>

Date: Thu, 25 Oct 2012 16:24:24 +0200

Well, you already wanted to use setfenv, so this is pretty easy using that: function run_script(object, script) local mt = {} local env = setmetatable({}, mt) function mt:__index(key) local value = o

227. Re: a few lua api questions:imbedding, object methods and object properties (score: 3)

Author: "Littlefield, Tyler" <tyler@...>

Date: Thu, 25 Oct 2012 08:09:55 -0600

AddExit('north', 32) That looks cooll. actually I'd prefer that. I"m not sure though how to make AddExit use self by default. what determines how that's going to be looked up, since it'll be in the r

228. Re: a few lua api questions:imbedding, object methods and object properties (score: 3)

Author: Rob Hoelz <rob@...>

Date: Thu, 25 Oct 2012 10:01:55 +0200

Here's the guideline I use for developing a scripting interface for anything: just write some example scripts. Don't worry about how you're going to do it just yet; just write some "play" scripts tha

229. Re: a few lua api questions:imbedding, object methods and object properties (score: 3)

Author: "Littlefield, Tyler" <tyler@...>

Date: Wed, 24 Oct 2012 09:47:28 -0600

Hello: The loading and execution of the objects is done for all objects. Basically here's how this works, or at least how I see it working. When objects are currently loaded, their script is executed

230. Re: Indexable functions (score: 2)

Author: Rena <hyperhacker@...>

Date: Tue, 23 Oct 2012 07:10:12 -0400

Well, you could always set a metatable for the function that traps __index and __newindex the same as you would for a table... -- Sent from my Game Boy.

231. Re: Indexable functions (score: 2)

Author: Elias Barrionovo <elias.tandel@...>

Date: Tue, 23 Oct 2012 09:06:52 -0200

It would indeed. Another pro is the possibility of docstrings. But it does raise some concerns about security and sandboxing: if locals and upvalues are accessible, how to wrap functions and properly

232. Re: noob - How to architect c++ code to use lua as external code (score: 2)

Author: Rena <hyperhacker@...>

Date: Sun, 21 Oct 2012 14:57:26 -0500

It sounds like you need to rethink how your code is interacting. You have an "AI object" C++ class of some type and you want Lua code to decide what it should do? Probably the simplest method is to r

233. Re: Can module updates ever be made safe? (score: 2)

Author: William Ahern <william@...>

Date: Fri, 19 Oct 2012 18:41:57 -0700

My first instinct is to accomplish this with sandboxing. That presumes that there are discrete and isolated execution contexts, e.g. a web server. You might use Lua 5.1/LuaJIT function environments o

234. Re: sandboxing embedded 5.2 (score: 35)

Author: Owen Shepherd <owen.shepherd@...>

Date: Sun, 23 Sep 2012 02:52:03 +0100

Normally, the way to do what you're doing would be to use luaL_loadstring, then set the environment on the returned function, then use lua_call/lua_pcall to invoke said function. This avoids the need

235. Re: sandboxing embedded 5.2 (score: 33)

Author: Jeremy Carter <jeremy@...>

Date: Sat, 22 Sep 2012 15:15:52 -0400

Well that was really easy, thank you Enrico! If anyone cares, my mistake was assuming that variables assigned inside the custom _ENV would be "globals" (i.e. retrievable with the C API's lua_getgloba

236. Re: sandboxing embedded 5.2 (score: 33)

Author: Enrico Colombini <erix@...>

Date: Sat, 22 Sep 2012 20:27:49 +0200

If I understood correctly what you're doing, you should find any 'global' created by your sandboxed function inside your sandbox_env table. -- Enrico

237. Re: sandboxing embedded 5.2 (score: 33)

Author: Jeremy Carter <jeremy@...>

Date: Sat, 22 Sep 2012 13:42:10 -0400

Sorry for the long post, a shorter version of my question is: When running some Lua script through the C API, and the script assigns a custom _ENV (a sandbox whitelist) and then assigns some variable

238. sandboxing embedded 5.2 (score: 35)

Author: Jeremy Carter <jeremy@...>

Date: Fri, 21 Sep 2012 15:19:32 -0400

Hi, I'm completely new to Lua, but loving it already. However, I've been having issues with sandboxing the environment for an embedded C++ project. Clearly I'm doing it wrong, but I haven't been able

239. Re: Easy remote eval / RPC solution (score: 2)

Author: Sean Conner <sean@...>

Date: Thu, 20 Sep 2012 17:01:19 -0400

It was thus said that the Great Eduardo Ochs once stated: If you are on a Unix system, you can recompile Lua with the target "generic", and use inetd or xinetd (depending up Unix system) to launch lu

240. Re: Easy remote eval / RPC solution (score: 2)

Author: Paul K <paulclinger@...>

Date: Thu, 20 Sep 2012 09:54:46 -0700

There are socket-based debuggers that do just that. I've been developing MobDebug (based on RemDebug) that allows one to open a socket connection and send commands to the client, including "EXEC com