Pinku,
Print the error message that was returned by eval>str to find out that
you are missing a vocabulary.
When I was using eval, I constructed the string using prepend to add a
`default' set of vocabularies. Be warned though; syntax is the
vocabulary you noticed being available at all times, this means that
any eval can USE: other vocabularies including io.
SYMBOL: eval-vocabs
"USING: kernel math prettyprint ;" " " append eval-vocabs set
: (eval-vocabs) ( str -- 'str ) eval-vocabs get prepend ;
{ } [ "1 1 + ." (eval-vocabs) eval>string print ] with-datastack drop
=> 2
Are you building an IRC bot? That's what I was using eval>str for.
To make the bot `safer' I used the with-datastack combinator to
produce a fresh stack between evaluations but defined words and loaded
vocabularies were remembered as they were in the code heap.
For isolation I used a non-persistent virtual machine to host the
factor instance with an OS image that did not contain sudo or even
root. To access the VM for installation or updates I used the
installation CD to boot with a root shell. I could sftp or scp new
bot code and reload that in factor while the limited OS was running
though. In order to maintain a persistent connection to IRC and
isolate the connection I had planed on using ZNC as an IRC frontend to
reduce join/quit messages upon bot reload and nickserv identification.
-Adam
On Fri, Oct 16, 2009 at 8:03 AM, Pinku Surana <[email protected]> wrote:
> Hi,
> I'd like to evaluate a string at runtime within an environment that uses
> additional vocabularies. The two words I found in the docs are eval( and
> eval>string. I guess both use some default vocabulary, but how can I add
> more without hacking the input string? Even better would be a way to
> construct an environment that has pre-loaded a set of vocabularies and
> denied permission to another set of vocabularies. For example, I'd like to
> disallow people from using anything in the io namespace.
> Also, I can't even make eval>string work. What's wrong with this?
> ( scratchpad ) "USING: kernel ; 1 1 + drop ;" eval>string
> :deprecations - show 6 deprecated word usages
> --- Data stack:
> "1: USING: kernel ; 1 1 + drop ;\n ^\nNo ..."
> ( scratchpad )
>
> Thanks,
> Pinku
>
>
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