package Algorithm::CheckDigits::M11_004;
use 5.006;
use strict;
use warnings;
use integer;
our $VERSION = '1.1.2';
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\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\d)$/) {
return $1 if ($2 eq $self->_compute_checkdigit($1));
}
return '';
} # basenumber()
sub checkdigit {
my ($self,$number) = @_;
if ($number =~ /^([-\d.]+)(\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) = ('','');
my $calc_cd = sub {
my $number = shift;
my $weight = shift;
my @digits = split(//,$number);
my $sum = 0;
for (my $i = 0; $i <= $#digits; $i++) {
$sum += $weight * $digits[$i];
--$weight;
};
$sum %= 11;
return 0 if (2 > $sum);
return 11 - $sum;
};
return -1 unless ($number =~ /^[-\d.]+$/);
$number =~ s/[-.]//g;
if ('cpf' eq $self->{type}) {
return -1 unless length($number) == 9;
$cd1 = $calc_cd->($number,10);
$cd2 = $calc_cd->($number . $cd1,11);
} elsif ('titulo_eleitor' eq $self->{type}) {
$number = substr("00000000000" . $number, -10);
$cd1 = $calc_cd->(substr($number,0,8),9);
$cd2 = $calc_cd->(substr($number,-2) . $cd1,4);
}
return $cd1 . $cd2;
} # _compute_checkdigit()
# Preloaded methods go here.
1;
__END__
=encoding iso-8859-1
=head1 NAME
CheckDigits::M11_004 - compute check digits for CPF (BR), TÃtulo Eleitoral (BR)
=head1 SYNOPSIS
use Algorithm::CheckDigits;
$cpf = CheckDigits('cpf');
if ($cpf->is_valid('043.033.407-90')) {
# do something
}
$cn = $cpf->complete('043.033.407-');
# $cn = '043.033.407-90'
$cd = $cpf->checkdigit('043.033.407-90');
# $cd = '90'
$bn = $cpf->basenumber('043.033.407-90');
# $bn = '043.033.407-'
=head1 DESCRIPTION
=head2 ALGORITHM
=over 4
=item 1
From left to right all digits are multiplied with their position
in the sequence.
=item 2
The sum of all products is computed.
=item 3
The sum of step 2 is taken modulo 11.
a) If the result is 0 or 1 the checkdigit is 0
b) otherwise the checkdigit is 11 minus the result.
=item 4
The first checkdigit is appended to the number and step 1 to 3 are
repeated.
=back
=head2 METHODS
=over 4
=item is_valid($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