package Algorithm::CheckDigits::M11_010;
use 5.006;
use strict;
use warnings;
use integer;
our $VERSION = '0.53';
our @ISA = qw(Algorithm::CheckDigits);
my @weight = ( 5, 4, 3, 2, 7, 6, 5, 4, 3, 2 );
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 =~ /^([0-9.]+)(\d)$/) {
return $2 == $self->_compute_checkdigits($1);
}
return ''
} # is_valid()
sub complete {
my ($self,$number) = @_;
if ($number =~ /^([0-9.]+)$/) {
return "$1" . $self->_compute_checkdigits($1);
}
return '';
} # complete()
sub basenumber {
my ($self,$number) = @_;
if ($number =~ /^([0-9.]+)(\d)$/) {
return $1 if ($2 == $self->_compute_checkdigits($1));
}
return '';
} # basenumber()
sub checkdigit {
my ($self,$number) = @_;
if ($number =~ /^([0-9.]+)(\d)$/) {
return $2 if ($2 == $self->_compute_checkdigits($1));
}
return '';
} # checkdigit()
sub _compute_checkdigits {
my $self = shift;
my $number = shift;
$number =~ s/\.//g;
my @digits = split(//,$number);
my $sum = 0;
for (my $i = 0; $i <= $#digits; $i++) {
$sum += $weight[$i] * $digits[$i];
}
$sum %= 11;
return $sum == 0 ? 0 : ($sum == 1 ? '' : 11 - $sum);
} # _compute_checkdigit()
# Preloaded methods go here.
1;
__END__
=head1 NAME
CheckDigits::M11_010 - compute check digits AHV number (CH)
=head1 SYNOPSIS
use Algorithm::CheckDigits;
$ahv = CheckDigits('ahv_ch');
if ($ahv->is_valid('123.45.678.113')) {
# do something
}
$cn = $ahv->complete('123.45.678.11');
# $cn = '123.45.678.113'
$cd = $ahv->checkdigit('123.45.678.113');
# $cd = '3'
$bn = $ahv->basenumber('123.45.678.113');
# $bn = '123.45.678.11';
=head1 DESCRIPTION
=head2 ALGORITHM
=over 4
=item 1
Beginning left every digit is weighted with 5,4,3,2,7,6,5,4,3,2.
=item 2
The weighted digits are added.
=item 3
The sum from step 2 is taken modulo 11.
=item 4
The checkdigit is 11 minus the sum from step 3. Is the difference 10,
the number won't be taken. If the difference is 11, the checkdigit is
0.
=back
=head2 METHODS
=over 4
=item is_valid($number)
Returns true only if C<$number> consists solely of numbers and dots
and the rightmost digit is a valid check digit according to the
algorithm given above.
Returns false otherwise,
=item complete($number)
The check digit for C<$number> is computed and appended the
end of C<$number>.
Returns the complete number with check digit or '' if C<$number>
does not consist solely of digits and dots.
=item basenumber($number)
Returns the basenumber of C<$number> if C<$number> has a valid check
digit.
Return '' otherwise.
=item checkdigit($number)
Returns the check digits of C<$number> if C<$number> has valid check
digits.
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