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41. Re: Question on get/setmetatable() (score: 2)

Author: "Joseph C. Sible" <josephcsible@...>

Date: Sat, 23 May 2020 14:35:11 -0400

This is a pet peeve of mine: you don't ever need to restrict setmetatable or getmetatable. You can't use setmetatable on non-tables even with no sandboxing, and that plus using __metatable appropriat

42. Re: Question on get/setmetatable() (score: 2)

Author: Andrew Gierth <andrew@...>

Date: Sat, 23 May 2020 14:05:13 +0100

Philippe> I'm not inventing the [[...]] notation: Well, you'd need to invent something else, because [[...]] already has a meaning in Lua. (t[[x]] is actually a function call, though not a very obvi

43. Re: question on _ENV (score: 2)

Author: Andrew Gierth <andrew@...>

Date: Thu, 21 May 2020 18:31:15 +0100

Coda> The advantage is exactly the same thing: it uses the standard Coda> language mechanisms instead of poking at the function internals, Coda> and it ends up also being a little more flexible and

44. Re: question on local vs nonlocal (score: 3)

Author: Philippe Verdy <verdyp@...>

Date: Sat, 16 May 2020 09:09:59 +0200

Finally if all variables are purely local and you enforce Lua to behave as a functional language, all Lua scripts will have to pass many input and output parameters explicitly. Calling functions will

45. Re: question on local vs nonlocal (score: 3)

Author: Philippe Verdy <verdyp@...>

Date: Sat, 16 May 2020 09:01:25 +0200

Also the proposed "solution", if it becomes implemented by default, would create a severe security issue: if the "\" syntax is used to uinconditionally give access to the parent environment, it will

46. Re: question on local vs nonlocal (score: 2)

Author: William Ahern <william@...>

Date: Tue, 12 May 2020 15:47:52 -0700

The creator of Ruby called local-by-default "the single biggest design flaw in Ruby". http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/42266 All the problems you have with unintended or ac

47. Release: JAL 0.0.1 Alpha (score: 2)

Author: Stefan Ginsberg <stefan.ginsberg@...>

Date: Sun, 22 Mar 2020 12:03:49 +0100

Hello. I have released JAL 0.0.1 Alpha as a spinoff of Lua. JAL has various changes to the codebase which in my opinion improve the functionality on several points. Please do not view any of this as

48. Re: Interrupting a lua script (score: 2)

Author: Archie Cobbs <archie.cobbs@...>

Date: Sun, 26 Jan 2020 15:01:01 -0600

On Sun, Jan 26, 2020 at 2:28 PM Levente Kovacs <leventelist@gmail.com> wrote: I have a C application that runs a LUA script. That script might have an infinite loop. Is there any way in my C applicat

49. Re: Why no for table-iterator like e. g. "hashpairs"? (score: 2)

Author: Coda Highland <chighland@...>

Date: Mon, 4 Nov 2019 21:12:43 -0600

Er, seriously? Compiled _javascript_ is faster than C? How is the current version of Lua not ?safe?? It?s one of the most stable code bases I?ve ever encountered. The performance claim might actuall

50. Re: Lua and Sol2 on Embedded Target? (score: 2)

Author: Philipp Janda <siffiejoe@...>

Date: Sat, 26 Oct 2019 16:53:54 +0200

Am 25.10.19 um 04:41 schröbte Russell Haley: Hello, Hi! So, now comes the torrent of questions: - Has anyone used Lua with Keil? I haven't, but it seems llvm/clang based with complete c++14 support,

51. Re: On implementing a functions whitelist for a sandbox (score: 4)

Author: Sean Conner <sean@...>

Date: Thu, 8 Aug 2019 12:01:52 -0400

It was thus said that the Great Dennis Fischer once stated: Ah, now that I see what code was presented in _Programming in Lua_ for sandboxing, I can see where the confusion comes froms. The approach

52. Re: On implementing a functions whitelist for a sandbox (score: 4)

Author: Sean Conner <sean@...>

Date: Wed, 7 Aug 2019 23:42:17 -0400

It was thus said that the Great Kynn Jones once stated: You're welcome. A sandbox is just a limited environment in which you run a program. For Lua, this can be anything from an environment devoid of

53. Re: On implementing a functions whitelist for a sandbox (score: 2)

Author: Kynn Jones <kynnjo@...>

Date: Wed, 7 Aug 2019 21:20:50 -0400

Hi Sean, Thank you for the detailed explanation. I think that the disconnect here is that I am trying (**really, really, really hard**) to implement what Roberto Ierusalimschy recommends in chapter 2

54. Re: Suggestion: names-isolation-statement (score: 2)

Author: nobody <nobody+lua-list@...>

Date: Mon, 15 Jul 2019 10:55:28 +0200

On 11/07/2019 23.15, Egor Skriptunoff wrote: A new syntax:    with white-list-of-names do       ....    end This statement makes all names from the outer scope (with exception of white-listed names)

55. Re: tostring userdata (score: 2)

Author: Coda Highland <chighland@...>

Date: Sat, 6 Jul 2019 00:02:21 -0500

On Fri, Jul 5, 2019 at 10:56 PM Sean Conner <sean@conman.org> wrote: It was thus said that the Great Coda Highland once stated:   Okay, so was this *ever* brought up about tostring()?  Because: [spc]

56. Re: [BUG] unsafe metatable paradigm (score: 2)

Author: Viacheslav Usov <via.usov@...>

Date: Wed, 26 Jun 2019 14:37:11 +0200

On Tue, Jun 25, 2019 at 11:18 PM Andrew Gierth <andrew@tao11.riddles.org.uk> wrote: > I suspect most sandboxes don't expose the IO library at all (mine certainly does not), since unmediated file acce

57. Re: [BUG] unsafe metatable paradigm (score: 2)

Author: Andrew Gierth <andrew@...>

Date: Tue, 25 Jun 2019 22:17:47 +0100

Viacheslav> So, why is the standard IO library not sandbox-friendly (in Viacheslav> the strict sense clarified above) out of the box? I suspect most sandboxes don't expose the IO library at all (min

58. Re: [BUG] unsafe metatable paradigm (score: 2)

Author: Viacheslav Usov <via.usov@...>

Date: Mon, 24 Jun 2019 22:37:56 +0200

On Mon, Jun 24, 2019 at 9:13 PM Egor Skriptunoff <egor.skriptunoff@gmail.com> wrote: > What trouble you are talking about? The trouble is the pervasive use of the unsafe paradigm in extant library co

59. Re: Errors in finalizers (score: 2)

Author: Andrew Gierth <andrew@...>

Date: Tue, 04 Jun 2019 22:08:05 +0100

David> But this is exactly what could happen when you throw the error David> in a finalizer: The code might currently be in a pcall which David> doesn't expect your finalizer error and therefor also

60. Re: lua-l Digest, Vol 105, Issue 13 (score: 2)

Author: Sergey Kovalev <kovserg33@...>

Date: Sat, 6 Apr 2019 18:52:48 +0300

I don't really understand how to use this mail list correctly from gmail. But I just want something like this not as crutch but as usual case for regular use. function pure_function(fn)     return lo