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lib/Algorithm/CheckDigits/M10_003.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M10_003;

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

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

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

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

sub _compute_checkdigit {
	my $self   = shift;
	my $number = shift;
	$number =~ s/-//g;
	if ($number =~ /^([0-9]*)$/) {
		my @digits = split(//,$number);
		my $even = 0;
		my $sum  = 9;
		for (my $i = 0; $i <= $#digits; $i++) {
			if ($even) {
				$sum += 3 * $digits[$i];
			} else {
				$sum += $digits[$i];
			}
			$even = not $even;
		}
		return (10 - ($sum % 10) % 10);
	}
	return -1;
} # _compute_checkdigit()

# Preloaded methods go here.

1;