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lib/Algorithm/CheckDigits/M11_003.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M11_003;

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

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

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

my @weight = ( 4,2,1,6,3,7,9,10,5,8,4,2 );

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 ($number =~ /^(\d{11})(\d)$/) {
		return $2 == $self->_compute_checkdigit($1);
	}
	return ''
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	if ($number =~ /^\d{11}$/) {
		my $cd = $self->_compute_checkdigit($number);
		return  0 > $cd ? '' : $number . $cd;
	}
	return '';
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	if ($number =~ /^(\d{11})(\d)$/) {
		return $1 if ($2 == $self->_compute_checkdigit($1));
	}
	return '';
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	if ($number =~ /^(\d{11})(\d)$/) {
		return $2 if ($2 == $self->_compute_checkdigit($1));
	}
	return '';
} # checkdigit()

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

	if ($number =~ /^\d{11}$/) {

		my @digits = split(//,$number);
		my $sum    = 0;
		my $cf     = 0;

		for (my $i = 0; $i <= $#digits; $i++) {

			$sum += $weight[$i] * $digits[$i];

		}
		$sum %= 11;
		for (my $i = 0; $i <= 9; $i++) {
			return $i
				if (10 == ($sum + $weight[11] * $i) % 11);
		}
	}
	return -1;
} # _compute_checkdigit()