One evening's sleep and I'll agree that I'm likely to break stuff this way especially since all the module's subroutines would have to be recompiled to use the data in the object instead of from the lexicals. Yick. I was musing this morning of breakfast that I have a bad habit of jumping off of more bridges than I have to - use of one work around doesn't justify the use of yet another. Somewhere along the way after I've convinced myself that whatever thing I had to do to make something else work (that was necessary) I somehow get the idea that "just a bit more" won't hurt. And eventually I end up with icky things like this: BEGIN{die "No. You should not be using this code.";}
package YAPE::Regex::EvilPatch;
use YAPE::Regex ();
use B qw(svref_2object);
use Devel::Pointer qw(unsmash_sv unsmash_hv);
use B::Deparse ();
sub patch {
return if
$_[0]->{'pat'} or
%YAPE::Regex::pat;
my $var;
# Copy the lexicals into globals. Also throw away the
# compiled versions of all of the regular expressions.
$var = fetch_pad_var( \ &YAPE::Regex::_ok_class, '$valid_POSIX' );
$YAPE::Regex::valid_POSIX = ''.unsmash_sv( $$var );
$var = fetch_pad_var( \ &YAPE::Regex::_ok_class, '$ok_cc_REx' );
$YAPE::Regex::ok_cc_REx = ''.unsmash_sv( $$var );
$var = fetch_pad_var( \&YAPE::Regex::next, '%pat' );
%YAPE::Regex::pat = map "$_", %{unsmash_hv( $$var )};
my $deparse = B::Deparse->new;
# Patch the ->new method so it copies %YAPE::Regex::pat
my $new_m = $deparse->coderef2text( \ &YAPE::Regex::new );
$new_m =~ s/(?<=bless\({)/'PAT', {%pat},/
or die "Couldn't add PAT to new";
$new_m = "sub $new_m;";
*YAPE::Regex::new = eval $new_m;
# Alter ->next so it fetches from $self->{'PAT'}
my $next = $deparse->coderef2text(\&YAPE::Regex::next);
$next =~ s/(?<=\$)pat(?=\{)/self->{'PAT'}/g;
*YAPE::Regex::next = eval "sub $next;";
# Same thin for ->_get_quant
my $quant = $deparse->coderef2text(\ &YAPE::Regex::_get_quant);
$quant =~ s/(?<=\$)pat(?=\{)/self->{'PAT'}/g;
*YAPE::Regex::_get_quant = eval "sub $quant";
# _ok_class uses all three lexicals. Same deal.
}
sub fetch_pad_var {
my $cv = shift;
my $var = shift;
my $ocv = svref_2object( $cv );
my ($names, $values) = map [ $_->ARRAY ], $ocv->PADLIST->ARRAY;
my $h;
for my $i (0 .. $#$names) {
if ( $names->[$i]->can('PV') and
$names->[$i]->PV eq $var ) {
return $values->[$i];
}
}
return ();
}
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|