#!/usr/bin/perl -T
use strict;
use warnings;
#use diagnostics;
use CGI qw/:standard/;
use CGI::Carp qw(fatalsToBrowser);

# Clean up our UNIX environment
# for more infor read perldoc perlsec
$ENV{'PATH'} = '/awiopt/radio:/tmp';
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};

# Flush the output buffer
$|++;

my @text;

# shuffle function from List::Util
sub shuffle (@) {
  my @a=\(@_);
  my $n;
  my $i=@_;
  map {
    $n = rand($i--);
    (${$a[$n]}, $a[$n] = $a[$i])[0];
  } @_;
}

print header;
print start_html(-title=>"Fun with Typoglycemia",
                 -BGCOLOR=>"#cccc99" ), "\n";
print "<tt><center>\n";
print h3("Fun", "With", "Typoglycemia"),"\n";
print "</center>\n";
print hr,"\n";

print "\n\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"1\" wid
+th=\"70%\" align=\"center\">\n\n";
print "<tr align=\"center\" bgcolor=\"#999966\">\n
       <th>Typoglycemic Text</th>\n
       </tr>\n";
print "<td>\n";
if ( defined (param('TEXT')) )
{
#    $/=undef;
    @text=param('TEXT');
     for (@text)  {
    my $line = $_;
    my $line_copy = $line;
    while ($line =~ m/(\w+)/g) {
        next if length($1) < 4;
        my $start_offset = pos($line) - length($1) +1;
        my $word_middle_length = length($1) - 2;

        # force two character lead-in and lead-out
             if ($word_middle_length > 4) {
            $word_middle_length -= 2;
            $start_offset++;
        }
        my $word_middle = substr($line, $start_offset, $word_middle_le
+ngth);
        my $shuffled_word_middle = join('', shuffle( split(//, $word_m
+iddle) ) );
        substr($line_copy, $start_offset, $word_middle_length) = $shuf
+fled_word_middle;
    }
    print "$line_copy\n";
   }
} 
print "</td>\n";
print "</table>\n";
print br,br;
print "\n\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"1\" wid
+th=\"70%\" align=\"center\">\n\n";
print "<tr align=\"center\" bgcolor=\"#999966\">\n
       <th>Enter your text</th>\n
       </tr>\n";
print "</table>\n";
print br,br;

print start_form;
print "<center>\n";
print textarea('TEXT',"", 15, 80), "\n",br;
print submit;
print end_form;
print "</center>\n",br;


print "\n\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"1\" hei
+ght=\"20\" width=\"70%\" align=\"center\">\n\n";
print "<tr align=\"center\" bgcolor=\"#999966\">\n
       <td> </td>\n
       </tr>\n";
print "</table>\n",br;
print end_html;
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