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lib/Algorithm/CheckDigits/M23_002.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M23_002;

use 5.006;
use strict;
use warnings;
use integer;

use version; our $VERSION = 'v1.3.6';

our @ISA = qw(Algorithm::CheckDigits);

my @keytable = (
	'W', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
	'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
	'P', 'Q', 'R', 'S', 'T', 'U', 'V', 
);

sub new {
	my $proto = shift;
	my $type  = shift;
	my $class = ref($proto) || $proto;
	my $self  = bless({}, $class);
	$self->{type} = lc($type);
	return $self;
} # new()

sub is_valid {
	my ($self,$number) = @_;
	if ($number =~ /^(\d{7})([A-W])([A-IW])?$/i) {
		return $2 eq $self->_compute_checkdigit($1,$3);
	}
	return ''
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	if ($number =~ /^(\d{7}).?([A-IW])?$/i) {
		return $1 . $self->_compute_checkdigit($1,$2) . ($2 || '');
	}
	return '';
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	if ($number =~ /^(\d{7})([A-W])([A-IW])?$/i) {
		if (uc($2) eq $self->_compute_checkdigit($1,$3)) {
			return $3 ? "$1.$3" : $1;
		}
	}
	return '';
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	if ($number =~ /^(\d{7})([A-W])([A-IW])?$/i) {
		return $2 if (uc($2) eq $self->_compute_checkdigit($1,$3));
	}
	return '';
} # checkdigit()

sub _compute_checkdigit {
	my ($self, $number,$optional) = @_;
	my $sum    = 0;
	my @digits = split(//,$number);

	for (my $i = 0; $i < 7; $i++) {
		$sum += $digits[$i] * (8-$i);
	}
	if ($optional and $optional =~ /[A-I]/i) {
		$sum += 9 * (ord($optional) - ord('A') + 1);
	}
	return $keytable[$sum % 23];

} # _compute_checkdigit()

# Preloaded methods go here.

1;
__END__

=head1 NAME