File Coverage

blib/lib/Algorithm/CheckDigits/M97_002.pm

Criterion	Covered	Total	%
statement	49	54	90.7
branch	7	14	50.0
condition	1	3	33.3
subroutine	12	12	100.0
pod	4	5	80.0
total	73	88	82.9

package Algorithm::CheckDigits::M97_002;
# vim: set sw=4 ts=4 tw=78 et si:

use 5.006;
use strict;
use warnings;
use integer;

use version; our $VERSION = qv('v1.3.5');

our @ISA = qw(Algorithm::CheckDigits);

my %subst = (
    A => 10, B => 11, C => 12, D => 13, E => 14,
    F => 15, G => 16, H => 17, I => 18, J => 19,
    K => 20, L => 21, M => 22, N => 23, O => 24,
    P => 25, Q => 26, R => 27, S => 28, T => 29,
    U => 30, V => 31, W => 32, X => 33, Y => 34,
    Z => 35,
);

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 = shift;

    if (my ($checkdigit,$number) = _prepare_number(shift)) {

        return $checkdigit eq _compute_checkdigit($number);
    }
	return ''
} # is_valid()

sub complete {
    my $self = shift;
    my $incomplete = uc(shift);

    if (my ($checkdigit,$number) = _prepare_number($incomplete)) {

        $incomplete =~ /^(..)..(.+)/;

		return $1 . _compute_checkdigit($number) . $2;
    }
    return '';
} # complete()

sub basenumber {
    my $self = shift;
    my $unchecked = shift;

    if (my ($checkdigit,$number) = _prepare_number($unchecked)) {

        $unchecked =~ /^(..)..(.+)/;

		return $1.'00'.$2
            if ($checkdigit eq _compute_checkdigit($number));
    }
    return '';
} # basenumber()

sub checkdigit {
    my $self = shift;

    if (my ($checkdigit,$number) = _prepare_number(shift)) {
		return $checkdigit
            if ($checkdigit eq _compute_checkdigit($number));
    }
    return '';
} # checkdigit()

sub _compute_checkdigit {
    my $number = shift;

#    my $bignum = Math::BigInt->new($number);
#    my $mod    = $bignum % 97;
#
# A comparison with Benchmark::compthese() brought:
#
#             Rate   bignum 9_digits
# bignum    2502/s       --     -95%
# 9_digits 46225/s    1748%       --
#
# so I reverted _compute_checkdigit to this code.
# Thanks to Detlef Pilzecker for making me aware of this.

    my $mod = '';
    while ($number ne '') {
        $number = $mod . $number;
        $mod    = substr($number,0,9,'') % 97;
    }
    return sprintf("%02d",(98 - $mod));
} # _compute_checkdigit()

sub _prepare_number {
    my $number = uc(shift);

    $number        =~ s/\s//g;

    if ($number =~ /^([A-Z]{2})(\d\d)([A-Z\d]{2,30})$/) {
        my $checkdigit = $2;
        $number        = $3 . $1 . '00';
        $number        =~ s/([A-Z])/$subst{$1}/g;
        return ($checkdigit,$number);
    }
    return;
} # _prepare_number()

# Preloaded methods go here.

1;
__END__