GraphViz2::Parse::ISA - Visualize N Perl class hierarchies as a graph


    use strict;
    use warnings;
    use File::Spec;
    use GraphViz2::Parse::ISA;

    my $parser = GraphViz2::Parse::ISA->new;
    unshift @INC, 't/lib';
    $parser->add(class => 'Adult::Child::Grandchild', ignore => []);
    $parser->add(class => 'HybridVariety', ignore => []);

    my $format      = shift || 'svg';
    my $output_file = shift || "parse.code.$format";

    $parser->graph->run(format => $format, output_file => $output_file);

See scripts/


Takes a class name and converts its class hierarchy into a graph. This can be done for N different classes before the graph is generated.

You can write the result in any format supported by Graphviz.

Constructor and Initialization

Calling new()

new() is called as my($obj) = GraphViz2::Parse::ISA->new(k1 => v1, k2 => v2, ...).

It returns a new object of type GraphViz2::Parse::ISA.

Key-value pairs accepted in the parameter list:

  • o graph => $graphviz_object

    This option specifies the GraphViz2 object to use. This allows you to configure it as desired.

    The default is GraphViz2->new. The default attributes are the same as in the synopsis, above. The default for GraphViz2::Parse::ISA is to plot from the bottom to the top (Grandchild to Parent). This is the opposite of GraphViz2.

    This key is optional.


add(class => $class[, ignore => $ignore])

Adds the class hierarchy of $class to an internal structure.

$class is the name of the class whose parents are to be found.

$ignore is an optional arrayref of class names to ignore. The value of $ignore is not preserved between calls to add().

After all desired calls to add(), you must call "generate_graph()" to actually trigger the call to the GraphViz2 methods add_node() and add_edge().

Returns $self for method chaining.

See scripts/


Processes the internal structure mentioned under add() to add all the nodes and edges to the graph.

After that you call GraphViz2's run() method on the graph object. See "graph()".

Returns $self for method chaining.

See scripts/


Returns the graph object, either the one supplied to new() or the one created during the call to new().

Scripts Shipped with this Module


Demonstrates combining 2 Perl class hierarchies on the same graph.

Outputs to ./html/parse.isa.svg by default. Change this by providing a format argument (e.g. svg) and a filename argument.


Many thanks are due to the people who chose to make Graphviz Open Source.

And thanks to Leon Brocard, who wrote GraphViz, and kindly gave me co-maint of the module.

The code in add() was adapted from GraphViz::ISA::Multi by Marcus Thiesen, but that code gobbled up package declarations in comments and POD, so I used Pod::Simple to give me just the source code.


GraphViz2 was written by Ron Savage in 2011.

Home page:


Australian copyright (c) 2011, Ron Savage.

    All Programs of mine are 'OSI Certified Open Source Software';
    you can redistribute them and/or modify them under the terms of
    The Perl License, a copy of which is available at: