#!/usr/bin/perl -w
use strict;

sub fitness {
  my ($chars) = @_;
  my $s = join '', @$chars;

  my $f = system('perl', '-ce', $s);
  ## zero and an immediate return if it fails to compile
  if ($f == 0) {
    $ret = 10;
  } else {
    return 0;
  }
  ## quotes and POD is cheating.  Comment char isn't included,
  ##   so don't bother with it.
  $ret-=10 if (substr($s, 0, 1) eq '=');  #subtract if it's a POD
  $ret-=10 if ($s =~ /^q(.).*?(\1)$/);    #q() string?
  $ret-=10 if ($s =~ /^([`'"]).*(\1)$/);  # quoted strings or backticks

  ## Spaces at the start and end are a lesser form of cheating
  $ret-=2 if ($s =~ /^ /);
  $ret-=2 if ($s =~ / $/);

  $ret++ if ($s =~ /\w \w/); # space separated words are kinda cool.

  if ($ret < 0) { $ret = 0 };
  return $ret;
}

use AI::Genetic;
my $ga = new AI::Genetic(
  -fitness    => \&fitness,
  -type       => 'listvector',
);

my @chars = ( 32..34,36..64,91..126 );
$_ = chr($_) for @chars;
$ga->init([ map { [@chars] } 1..20 ]);

$ga->evolve('randomTwoPoint', 50);
my $chars = $ga->getFittest->genes();;
print "Best score = ", $ga->getFittest->score(), ".\n";
my $s = join '',@$chars;
print "$s\n";