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exeunt (319)

  reversethis-{} {ta} {izaguf}

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Journal of exeunt (319)

Wednesday March 20, 2002
12:50 PM

Learning about inheritance...

[ #3677 ]

Brought on by laziness, of having to get the web page into a variable, and then create the object for HTML::TokeParser, I knew there had to be a better way, while reading Object Oriented Perl, I decided to give it a try. Some of the items I want to change is to check for errors, and to allow files or actual html data passed to new(), not just a url, but that is just icing on the cake.

package HTML::TokeParser::URL;
use strict;
use warnings;

    use HTML::TokeParser;
    use LWP::Simple qw(get);
    our @ISA = qw(HTML::TokeParser);

sub new {
    my $proto = shift;
    my $class = ref($proto) || $proto;
    my $page = get(shift);
    my $self = HTML::TokeParser->new(\$page);
    bless ($self, $class);
    return $self;


Updated: Better (updated!) version of this on perlmonks here.

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  • You forgot to check whether the get() succeeded!

    In LWP OO terms:

    use LWP;
    my $resp = LWP::UserAgent->new->get($url);
    die "GRAH! ", $resp->status_line unless $resp->is_success;
    ... HTML::TokeParser->new( $resp->content_ref ) ...

    • I get this now (with your modifications):

      Can't locate object method "get" via package "LWP::UserAgent"
      (perhaps you forgot to load "LWP::UserAgent"?) at HTML/TokeParser/ line 18.

      • Upgrade your LWP!
        • This is on a windows machine, ActivePerl 631. In PPM I see no where to update LWP/libwww-perl. In PPM3 it shows libwww-perl 5.51 as up to date.

          I guess I could manualy upgrade it manualy.

          I did check this on a FreeBSD box, and it works! Thanks for the suggestion.
          • Or just do $browser->request(HTTP::Request->new(GET=>$url)) instead of $browser->get($url)
            • I like this approch, since it will now work on older versions of LWP. (In a perfect world backward compatibility would not be known).

              Thanks for your help.
              • I shouldn't pass up this chance to say that there are certain security problems with older LWP dists; but if you just don't use them in a CGI, you're fine.