#!/usr/bin/env perl
#
# Note: t/test.t searches for the next line.
# Annotation: Demonstrates graphing a Perl regular expression.
use strict;
use warnings;
use File::Spec;
use GraphViz2;
use GraphViz2::Parse::Regexp;
use Log::Handler;
# ------------------------------------------------
my($logger) = Log::Handler -> new;
$logger -> add
(
screen =>
{
maxlevel => 'debug',
message_layout => '%m',
minlevel => 'error',
}
);
my($graph) = GraphViz2 -> new
(
edge => {color => 'grey'},
global => {directed => 1},
graph => {rankdir => 'TB'},
logger => $logger,
node => {color => 'blue', shape => 'oval'},
);
my($g) = GraphViz2::Parse::Regexp -> new(graph => $graph);
$g -> create(regexp => '(([abcd0-9])|(foo))');
my($format) = shift || 'svg';
my($output_file) = shift || File::Spec -> catfile('html', "parse.regexp.$format");
$graph -> run(format => $format, output_file => $output_file);