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- Subject: Re: Turing-incomplete Lua?
- From: Luiz Henrique de Figueiredo <lhf@...>
- Date: Tue, 30 Nov 2004 22:25:35 -0200
> Is there any reasonably easy way to use Lua as a data-
> description language, while disallowing the features
> that make it a Turing-complete language?
I'm not sure that's what you mean, but if your data description is a series of
expressions, you may be able to do what you want by simply prepending "return "
to the file before compiling. This will avoid all procedural constructs in
the main chunk.
However, itt won't be completely safe because you still write things like
return (function () for i=1,10 do print(i) end end)()
To handle these, you could set up a call hook and raise an error at run time.
(You still need to allow the chunk to run, and this is a function call; so
you need to disallow nested functions calls.)