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lib/Algorithm/CheckDigits/M11_008.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M11_008;

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

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

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

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

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 ($number =~ /^(\d{8})$/) {
		return 0 == $self->_compute_checkdigits($1);
	}
	return ''
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	return "$1" if(   $number =~ /^(\d{8})$/
	              and 0 == $self->_compute_checkdigits($1));
	return '';
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	return "$1" if(   $number =~ /^(\d{8})$/
	              and 0 == $self->_compute_checkdigits($1));
	return '';
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	return '' if(   $number =~ /^(\d{8})$/
	            and 0 == $self->_compute_checkdigits($1));
	return undef;
} # checkdigit()

sub _compute_checkdigits {
	my $self    = shift;

	my @digits = split(//,shift);
	my $sum = 0;
	for (my $i = 0; $i <= $#digits; $i++) {
		$sum += $weight[$i] * $digits[$i];
	}
	$sum %= 11;
	return $sum;
} # _compute_checkdigit()

# Preloaded methods go here.

1;
__END__

=head1 NAME

CheckDigits::M11_008 - compute check digits for VAT Registration Number (DK)

=head1 SYNOPSIS

  use Algorithm::CheckDigits;

  $ustid = CheckDigits('ustid_dk');