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lib/Algorithm/CheckDigits/M10_011.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M10_011;

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

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

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

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 ($number =~ /^(.*)([0-9])$/) {
		return $2 == $self->_compute_checkdigit($1);
	}
	return ''
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	my $cd = $self->_compute_checkdigit($number);
	if ($cd != -1) {
		return $number . $cd;
	}
	return '';
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	if ($number =~ /^(.*)([0-9])$/) {
		return $1 if ($2 == $self->_compute_checkdigit($1));
	}
	return '';
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	if ($number =~ /^(.*)([0-9])$/) {
		return $2 if ($2 == $self->_compute_checkdigit($1));
	}
	return '';
} # checkdigit()

sub _compute_checkdigit {
	my $self   = shift;
	my $number = shift;
	$number =~ s/\s//g;
	$number =~ s/^1z//i;
	$number =~ y/A-Za-z/2-90-90-72-90-90-7/;
	if ($number =~ /^([0-9]*)$/) {
		my @digits = split(//,$number);
		my $even = 0;
		my $sum  = 0;
		foreach my $digit (@digits) {
			$sum += $digit;
			$sum += $digit if ($even);
			$even = not $even;
		}
		return (10 - $sum % 10) % 10;
	}
	return -1;
} # _compute_checkdigit()

# Preloaded methods go here.

1;