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lib/Algorithm/CheckDigits/M09_001.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M09_001;

use 5.006;
use strict;
use warnings;

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

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

sub new {
	my $proto = shift;
	my $class = ref($proto) || $proto;
	return bless({}, $class);
} # new()

sub is_valid {
	my ($self,$number) = @_;
	if ($number =~ /^([A-Za-z][0-9]{10})([0-9])$/) {
		return $2 == _compute_checkdigit($1);
	}
	return 0;
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	if ($number =~ /^[A-Za-z][0-9]{10}$/) {
		return  $number . _compute_checkdigit($number);
	}
	return '';
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	if ($number =~ /^([A-Za-z][0-9]{10})([0-9])$/) {
		return $1 if ($2 == _compute_checkdigit($1));
	}
	return '';
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	if ($number =~ /^([A-Za-z][0-9]{10})([0-9])$/) {
		return $2 if ($2 == _compute_checkdigit($1));
	}
	return '';
} # checkdigit()

sub _compute_checkdigit {
	my $number = shift;
	if ($number =~ /^([A-Za-z])([0-9]{10})$/) {
		my @nums = ();
		my $sum  = 0;
		push(@nums,ord(uc($1)) - ord('A') +1);
		push(@nums,split(//,$2));
		foreach my $num (@nums) {
			$sum += $num;
		}
		return 8 - ($sum % 9);
	}
	return -1;
} # _compute_checkdigit()

# Preloaded methods go here.

1;
__END__

=head1 NAME

CheckDigits::M09_001 - compute check digits for Euro notes

=head1 SYNOPSIS