Re: LuaWebserver [was: a few questions re LuaSockets]

[Joe Stewart <jstewart@...>]

At 09:58 PM 1/23/2003, you wrote:

> >I was wondering if it was possible from standard lua to set the global
> >environment to another table prior to a dofile(), then kill the temp one
> >and restore the main?
>
> Sure. In Lua 4 do
>
>         do
>         local newG={ fill here with what is needed in the sandbox }
>         local oldG=globals(newG)
>         oldG.dofile(xxx)
>         oldG.globals(oldG)
>         end

Thanks for the tip... I had problems with this at first until I realized I 
had to put all the functions I wanted to use into the new environment like:

do
        local newG = {}
        newG.write = write
        newG._OUTPUT = write
        newG._ERRORMESSAGE = _ERRORMESSAGE
        newG._ALERT = _ALERT
        local oldG = globals(newG)
        oldG.dofile(xxx)
        oldG.globals(oldG)
end

seeing error messages helped a great deal ;-)!

On a side note, I'm a forth fan from waaaaay back. Lua reminds me (in the 
most positive aspects) of forth with a contemporary syntax. Anyone else 
have this background and care to comment? I was most amused with the 
ability to redefine existing functions... very nice!

Thanks to the lua creators and community! I really like lua!

-joe