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lib/Algorithm/CheckDigits/M11_012.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M11_012;

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

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

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

my @weight = ( 2,3,4,5,6,7,1,6,7,2,3 );

my %table_to = (
	0 => 0, 1 => 1, 2 => 2, 3 => 3, 4 => 4, 5 => 5,
	6 => 6, 7 => 7, 8 => 8, 9 => 9, A => 12, B => 14,
	C => 16, D => 18, E => 20, F => 22, G => 24, H => 26,
	I => 28, J => 6, K => 8, L => 10, M => 12, N => 14,
	O => 16, P => 18, Q => 20, R => 22, S => 4, T => 6,
	U => 8, V => 10, W => 12, X => 14, Y => 16, Z => 18,
);

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 ($number =~ /^([-0-9a-z]+)(\d)$/i) {
		return $2 == $self->_compute_checkdigits($1);
	}
	return undef;
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	if ($number =~ /^([-0-9a-z]+)$/i
	   and (my $cd = $self->_compute_checkdigits($1)) ne '') {
		return $1 . $cd;
	}
	return undef;
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	if ($number =~ /^([-0-9a-z]+)(\d)$/i) {
		return $1 if ($2 == $self->_compute_checkdigits($1));
	}
	return undef;
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	if ($number =~ /^([-0-9a-z]+)(\d)$/i) {
		return $2 if ($2 == $self->_compute_checkdigits($1));
	}
	return undef;
} # checkdigit()

sub _compute_checkdigits {
	my $self   = shift;
	my $number = shift;

	$number =~ s/-//g;

	my @digits = split(//,$number);
	my $len = scalar(@digits) + 1;
	my $sum = 0;
	for (my $i = 0; $i <= $#digits; $i++) {
		$sum += $weight[$i] * $table_to{uc($digits[$i])};
	}
	$sum %= 11;
	return ($sum == 0) ? 1 : ($sum == 1) ? 0 : 11 - $sum;
} # _compute_checkdigit()

# Preloaded methods go here.

1;
__END__

=head1 NAME