I have a piece of code running as an Apache::Registry script under mod_perl that accepts user input and evaluates it. Hopefully, the input is a mathematical expression. In case it is not, I am trying to execture it in a 'Safe' compartment, a la:

use Safe;
$compartment = new Safe('userMath');
$result = $compartment->reval($expressionToEval);

[download]

The problem is, I want to use the overloaded trig functions from Math::Complex to evaluate things such as sqrt(-4). How can I tell Safe that it is allowed to use Math::Complex?

If I use Math::Complex in the calling package, I can do

$compartment->permit(qw(sqrt));

[download]

and the code will then apparently try to use the sqrt() from Math::Complex. However, since it is unaware of things not in the compartment, it fails with

Can't locate object method "make" via package "Math::Complex" at /usr/lib/perl5/5.6.0/Math/Complex.pm line 165.

I can't seem to find a way to make Safe aware of the entire Math::Complex package. I have tried strategies like:

$compartment->share_from('Math::Complex', [ '&make' ]);

[download]
and 
$compartment->reval('use Math::Complex');

[download]

to no avail. Any suggestions?

In reply to Using Safe to reval complex math by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.