Re: loadstring and accessing local variables

[Petite Abeille <petite.abeille@...>]

On Dec 11, 2009, at 9:46 PM, Gert wrote:

> I've been playing around with that but no luck yet. 
> 
> my first try was
> 
>        setfenv(chunk, getfenv(1))
> 
> But this fails.

Right. The chunk doesn't have any environment at this point. You need to create one.

Here is an usage example:

http://dev.alt.textdrive.com/browser/HTTP/Data.lua#L63

local function Decode( anObject )
    local aChunk = assert( loadstring( anObject ) )
    
    setfenv( aChunk, { _ = {}, f = DecodeFunction } )
    aChunk()
        
    return getfenv( aChunk )._
end

In other words, provide '_' and 'f' to the chunk to use when executed.

>  My guess would be that getfenv() would get the
> environment for the current function, but the environment does not
> contain the local variables of the function itself, only the functions
> in, well, it's environment.

Right. You can use the environment to build an appropriate context for the chunk to execute in. What an "appropriate context" means, is up to you.