package Algorithm::CheckDigits::M10_006;
use 5.006;
use strict;
use warnings;
use integer;
use version; our $VERSION = 'v1.3.2';
our @ISA = qw(Algorithm::CheckDigits);
my @weight = ( 2,1,2,5,7,1,2,1,2,1,2,1 );
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}[A-Za-z]\d\d)(\d)$/) {
return $2 == $self->_compute_checkdigit($1);
}
return ''
} # is_valid()
sub complete {
my ($self,$number) = @_;
if ($number =~ /^\d{8}[A-Za-z]\d\d$/) {
return $number . $self->_compute_checkdigit($number);
}
return '';
} # complete()
sub basenumber {
my ($self,$number) = @_;
if ($number =~ /^(\d{8}[A-Za-z]\d\d)(\d)$/) {
return $1 if ($2 == $self->_compute_checkdigit($1));
}
return '';
} # basenumber()
sub checkdigit {
my ($self,$number) = @_;
if ($number =~ /^(\d{8}[A-Za-z]\d\d)(\d)$/) {
return $2 if ($2 == $self->_compute_checkdigit($1));
}
return '';
} # checkdigit()
sub _compute_checkdigit {
my $self = shift;
my $number = shift;
if ($number =~ /^(\d{8})([A-Za-z])(\d\d)$/) {
my $lv = sprintf("%2.2d",ord(uc($2)) - ord('A') + 1);
my @digits = split(//,"$1$lv$3");
my $sum = 0;
for (my $i = 0; $i <= $#digits; $i++) {
my $tmp = $weight[$i] * $digits[$i];
$sum += $tmp / 10;
$sum += $tmp % 10
}
return $sum % 10;
}
return -1;
} # _compute_checkdigit()
# Preloaded methods go here.
1;
__END__
=head1 NAME
CheckDigits::M10_006 - compute check digits for Rentenversicherung (DE)
=head1 SYNOPSIS
use Algorithm::CheckDigits;
$rv = CheckDigits('rentenversicherung');
if ($rv->is_valid('65180539W001')) {
# do something
}
$cn = $rv->complete('65180539W00');
# $cn = '65180539W001'
$cd = $rv->checkdigit('65180539W001');
# $cd = '1'
$bn = $rv->basenumber('65180539W001');
# $bn = '65180539W00'
=head1 DESCRIPTION
=head2 ALGORITHM
=over 4
=item 1
The letter is replaced with a two-figure number appropriate to the
position of the letter in the german alphabet.
=item 2
Beginning left all numbers are weighted with 2,1,2,5,7,1,2,1,2,1,2,1.
=item 3
The the total of the digits of all products is computed.
=item 4
The check digit is sum from step 3 taken modulo 10.
=back
=head2 METHODS
=over 4
=item is_valid($number)
Returns true only if C<$number> consists solely of numbers and the last digit
is a valid check digit according to the algorithm given above.
Returns false otherwise,
=item complete($number)
The check digit for C<$number> is computed and concatenated to the end
of C<$number>.
Returns the complete number with check digit or '' if C<$number>
does not consist solely of digits and spaces.
=item basenumber($number)
Returns the basenumber of C<$number> if C<$number> has a valid check
digit.
Return '' otherwise.
=item checkdigit($number)
Returns the checkdigit of C<$number> if C<$number> has a valid check
digit.
Return '' otherwise.
=back
=head2 EXPORT
None by default.
=head1 AUTHOR
Mathias Weidner, C<< <mamawe@cpan.org> >>
=head1 SEE ALSO
L<perl>,
L<CheckDigits>,
F<www.pruefziffernberechnung.de>.
=cut