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lib/Algorithm/CheckDigits/M11_017.pm  view on Meta::CPAN

# vim: set ts=4 sw=4 tw=78 si et:
package Algorithm::CheckDigits::M11_017;

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 ( $number =~ /^([-\d]+)(\d)$/ ) {
        return $2 eq $self->_compute_checkdigit($1);
    }
    return '';
}    # is_valid()

sub complete {
    my ( $self, $number ) = @_;
    if ( $number =~ /^[-\d]+$/ ) {
        my $cd = $self->_compute_checkdigit($number);
        return $number . $cd unless 0 > $cd;
    }
    return '';
}    # complete()

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

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

sub _compute_checkdigit {
    my $self   = shift;
    my $number = shift;
    my ( $cd1, $cd2 ) = ( '', '' );

    $number =~ s/[-]//g;
    my @digits = split //, $number;
    my $sum = 0;
    for ( my $i = 0; $i <= $#digits; $i++ ) {
        $sum += ( $i + 1 ) * $digits[$i];
    }
    $sum %= 11;
    return 0 if ( 9 < $sum );
    return $sum;
}    # _compute_checkdigit()

# Preloaded methods go here.

1;
__END__

=head1 NAME