Re: Controlling execution

[Michael Roth <mroth@...>]

Florian Berger wrote:

> Ok. What I want to control at this point are variable assignments 
> (global and local) and function calls. With function calls I mean 
> function's parameters and return values. So I want to have control over 
> parameters before function is called and return values before they are 
> returned.

At least for global functions and variables, you could implement this in 
Lua itself:

For your chunk of code to be executed, set a private environment 
(setfenv) with a metatable containing __index and __newindex functions. 
Inside these functions you could catch the assigment and retrieval of 
global variables. For the case there is a retrieval of a function 
(because a function call is to be made), you could return a proxy 
function (a closure) which checks the arguments if it gets called and 
call the real function after the checks.

You can't trace local variables with this approach.

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