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lib/Algorithm/CheckDigits/M11_001.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M11_001;

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

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

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

my $cd = {
	'isbn'		=> [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'X', 0 ],
	'ustid_pt'	=> [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,  0,  0 ],
	'hkid'		=> [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'A', 0 ],
	'wagonnr_br'	=> [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,  0,  1 ],
	'nhs_gb'	=> [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1,  0 ],
	'vat_sl'	=> [ 1, 0, 2, 3, 4, 5, 6, 7, 8, 9,  0, -1 ], # ?
};

$cd->{'issn'} = $cd->{'isbn'};
$cd->{'vatrn_pt'} = $cd->{'ustid_pt'};

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 ($number =~ /^(.+)(.)$/) {
		return uc($2) eq $self->_compute_checkdigit($1);
	}
	return ''
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	if ($number =~ /^[-0-9A-Za-z]+$/) {
		return  $number . $self->_compute_checkdigit($number);
	}
	return '';
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	if ($number =~ /^(.+)(.)$/) {
		return $1 if (uc($2) eq $self->_compute_checkdigit($1));
	}
	return '';
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	if ($number =~ /^(.+)(.)$/) {
		return $2 if (uc($2) eq $self->_compute_checkdigit($1));
	}
	return '';
} # checkdigit()

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

	if ($number =~ /^[-0-9A-Za-z]+$/) {

		$number =~ s/-//g;
		my @digits = split(//,$number);
		my $sum    = 0;
		my $weight = 2;

		for (my $i = $#digits; $i >= 0; $i--) {

			$digits[$i] = 1 + ord(uc($digits[$i])) - ord('A')
				if ($digits[$i] =~ /[A-Z]/i);
			$sum += $weight * $digits[$i];
			++$weight;

		}
		$sum %= 11;
		return $cd->{$self->{type}}[11-$sum] if ($cd->{$self->{type}});
	}
	return -1;
} # _compute_checkdigit()