Wise gurus, what in the heck does this code actually DO?

 $v = ${$pairs{$ca}}[0];
            if ($types{$ca}) {
                $v = 0 unless defined $v;
                OP: {
                    $r &= $v <  $cv, last OP if $co eq '<';
                    $r &= $v <= $cv, last OP if $co eq '<=';
                    $r &= $v != $cv, last OP if $co eq '!=';
                    $r &= $v >= $cv, last OP if $co eq '>=';
                    $r &= $v >  $cv, last OP if $co eq '>';
                    $r &= $v == $cv;
                }
            } else {
                $v = '' unless defined $v;
                OP: {
                    $r &= $v lt $cv, last OP if $co eq '<';
                    $r &= $v le $cv, last OP if $co eq '<=';
                    $r &= $v ne $cv, last OP if $co eq '!=';
                    $r &= $v ge $cv, last OP if $co eq '>=';
                    $r &= $v gt $cv, last OP if $co eq '>';
                    $r &= $v eq $cv;
                }

[download]




What is the OP: ? is that a label? Variable? I am new to PERL and I dont have a clue what this bit of code is actually doing, nor can I find anything like it out there.
thanks

20050121 Janitored by Corion: Added code tags

Retitled by davido.

In reply to What does 'last OP;' do? by Danwifi

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.