File Coverage

blib/lib/Digest/BubbleBabble.pm

Criterion	Covered	Total	%
statement	38	38	100.0
branch	4	4	100.0
condition	3	3	100.0
subroutine	6	6	100.0
pod	1	1	100.0
total	52	52	100.0

package Digest::BubbleBabble;
use strict;
use 5.008_001;

use Exporter;
use vars qw( @EXPORT_OK @ISA $VERSION );
@ISA = qw( Exporter );
@EXPORT_OK = qw( bubblebabble );

$VERSION = '0.02';

use vars qw( @VOWELS @CONSONANTS );
@VOWELS = qw( a e i o u y );
@CONSONANTS = qw( b c d f g h k l m n p r s t v z x );

sub bubblebabble {
    my %param = @_;
    my @dgst = map ord, split //, $param{Digest};
    my $dlen = length $param{Digest};

    my $seed = 1;
    my $rounds = int($dlen / 2) + 1;
    my $retval = 'x';
    for my $i (0..$rounds-1) {
        if ($i+1 < $rounds || $dlen % 2) {
            my $idx0 = ((($dgst[2 * $i] >> 6) & 3) + $seed) % 6;
            my $idx1 = ($dgst[2 * $i] >> 2) & 15;
            my $idx2 = (($dgst[2 * $i] & 3) + $seed / 6) % 6;
            $retval .= $VOWELS[$idx0] . $CONSONANTS[$idx1] . $VOWELS[$idx2];
            if ($i+1 < $rounds) {
                my $idx3 = ($dgst[2 * $i + 1] >> 4) & 15;
                my $idx4 = $dgst[2 * $i + 1] & 15;
                $retval .= $CONSONANTS[$idx3] . '-' . $CONSONANTS[$idx4];
                $seed = ($seed * 5 + $dgst[2 * $i] * 7 +
                        $dgst[2 * $i + 1]) % 36;
            }
        }
        else {
            my $idx0 = $seed % 6;
            my $idx1 = 16;
            my $idx2 = $seed / 6;
            $retval .= $VOWELS[$idx0] . $CONSONANTS[$idx1] . $VOWELS[$idx2];
        }
    }
    $retval .= 'x';
    $retval;
}

1;
__END__