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lib/Algorithm/CheckDigits/M07_001.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M07_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 ($number =~ /^([0-9]*)([0-9])$/) {
		return ($2 == _compute_checkdigit($1));
	}
	return 0;
} # is_valid()

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

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

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

sub _compute_checkdigit {
	my $number = shift;
	my @digits = split(//,$number);
	my $even   = 0;
	my $sum    = 0;
	foreach my $digit (@digits) {
		$sum += $digit;
		$sum += $digit if ($even);
		$even = not $even;
	}
	return $sum % 7;
} # _compute_checkdigit()

# Preloaded methods go here.

1;
__END__

=head1 NAME

CheckDigits::M07_001 - compute check digits modulo 7 method 1

=head1 SYNOPSIS

  use Algorithm::CheckDigits;