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Ovid (2709)

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Stuff with the Perl Foundation. A couple of patches in the Perl core. A few CPAN modules. That about sums it up.

Journal of Ovid (2709)

Sunday February 15, 2009
10:04 AM

Class::Sniff: combine separate inheritance graphs.

[ #38481 ]

I've just uploaded Class::Sniff 0.07. It no longer has any concept of "tree" (and this made the internal code easier to understand) and you can pass an instance to the constructor -- a minor tweak, but still very useful.

My favorite feature, though, is combining graphs. The following code lets me generate a nice PNG of HTML::TokeParser::Simple's inheritance hierarchy. (Sigh. No images allowed here.)

#!/usr/bin/env perl

use strict;
use warnings;

use Class::Sniff;
use HTML::TokeParser::Simple;

my $html = <<'END_HTML';
        <!-- This is a comment -->
        <title>This is a title</title>
            print "<!-- this is generated by php -->";
    <body alink="#0000ff" BGCOLOR="#ffffff">
        <h1>Do not edit this HTML lest the tests fail!!!</h1>
    <hr class="foo" />
    <hr class="bar"/>
my $parser = HTML::TokeParser::Simple->new( string => $html );
my %seen;
my @sniffs;
while ( my $token = $parser->get_token ) {
    no warnings 'numeric';
    next if $seen{ ref $token }++;
    push @sniffs => Class::Sniff->new( { class => $token } );
my $sniff = pop @sniffs;
my $graph = $sniff->combine_graphs(@sniffs);
my $graphviz = $graph->as_graphviz();
open my $DOT, '|dot -Tpng -o graph.png' or die("Cannot open pipe to dot: $!");
print $DOT $graphviz;

You could also include UNIVERSAL with the universal => 1 argument to the constructor and all objects will be attached on graphs since that's the ultimate base class for everything.

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