@@ -1,17 +0,0 @@
-Version 1.00
- 03/25/02 - Fixed linguistic problem in error message ("not correct" vs.
- "incorrect").
-
-Version 0.13
-
- 05/03/01 - Changed is_valid to always return 1 or '' (instead of 0 or
- sometimes undef) and it sets $ERROR when the check_digit doesn't match.
-
- 05/03/01 - Small change to the calculation of the return value of check_digit.
- Purely for aesthetic reasons.
-
-Version 0.12
-
- 05/02/01 - Replaced the ill-conceived C<die> call in check_digit with the
- $ERROR variable that contains the reason for the "failure."
-
@@ -0,0 +1,32 @@
+Revision history for Perl module Algorithm::LUHN
+
+1.01 2014-06-30 NEILB
+
+ - Added SEE ALSO section with links to other LUHN modules.
+ - Renamed CHANGES to Changes and reformatted as per CPAN::Changes::Spec
+ - Moved LUHN.pm to lib/Algorithm/LUHN.pm, as per convention
+ - Switched to Dist::Zilla and set min perl version to 5.006
+ - Improved doc for is_valid(), in response to RT#43842
+ - Added github repo to pod
+
+1.00 2002-03-26 TAYERS
+
+ - Fixed linguistic problem in error message
+ ("not correct" vs. "incorrect").
+
+0.13 2001-05-03 TAYERS
+
+ - Changed is_valid to always return 1 or '' (instead of 0 or
+ sometimes undef) and it sets $ERROR when the check_digit doesn't match.
+ - Small change to the calculation of the return value of check_digit.
+ Purely for aesthetic reasons.
+
+0.12 2001-05-02 TAYERS
+
+ - Replaced the ill-conceived C<die> call in check_digit with the
+ $ERROR variable that contains the reason for the "failure."
+
+0.10 2001-05-01 TAYERS
+
+ - First release to CPAN
+
@@ -0,0 +1,379 @@
+This software is copyright (c) 2001 by Tim Ayers.
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.
+
+Terms of the Perl programming language system itself
+
+a) the GNU General Public License as published by the Free
+ Software Foundation; either version 1, or (at your option) any
+ later version, or
+b) the "Artistic License"
+
+--- The GNU General Public License, Version 1, February 1989 ---
+
+This software is Copyright (c) 2001 by Tim Ayers.
+
+This is free software, licensed under:
+
+ The GNU General Public License, Version 1, February 1989
+
+ GNU GENERAL PUBLIC LICENSE
+ Version 1, February 1989
+
+ Copyright (C) 1989 Free Software Foundation, Inc.
+ 51 Franklin St, Suite 500, Boston, MA 02110-1335 USA
+
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The license agreements of most software companies try to keep users
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+
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+That's all there is to it!
+
+
+--- The Artistic License 1.0 ---
+
+This software is Copyright (c) 2001 by Tim Ayers.
+
+This is free software, licensed under:
+
+ The Artistic License 1.0
+
+The Artistic License
+
+Preamble
+
+The intent of this document is to state the conditions under which a Package
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+ - "Freely Available" means that no fee is charged for the item itself, though
+ there may be fees involved in handling the item. It also means that
+ recipients of the item may redistribute it under the same conditions they
+ received it.
+
+1. You may make and give away verbatim copies of the source form of the
+Standard Version of this Package without restriction, provided that you
+duplicate all of the original copyright notices and associated disclaimers.
+
+2. You may apply bug fixes, portability fixes and other modifications derived
+from the Public Domain or from the Copyright Holder. A Package modified in such
+a way shall still be considered the Standard Version.
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+3. You may otherwise modify your copy of this Package in any way, provided that
+you insert a prominent notice in each changed file stating how and when you
+changed that file, and provided that you do at least ONE of the following:
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+ a) place your modifications in the Public Domain or otherwise make them
+ Freely Available, such as by posting said modifications to Usenet or an
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+ modifications in the Standard Version of the Package.
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+ b) use the modified Package only within your corporation or organization.
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+ c) rename any non-standard executables so the names do not conflict with
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+ d) make other distribution arrangements with the Copyright Holder.
+
+4. You may distribute the programs of this Package in object code or executable
+form, provided that you do at least ONE of the following:
+
+ a) distribute a Standard Version of the executables and library files,
+ together with instructions (in the manual page or equivalent) on where to
+ get the Standard Version.
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+ c) accompany any non-standard executables with their corresponding Standard
+ Version executables, giving the non-standard executables non-standard
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+ equivalent), together with instructions on where to get the Standard
+ Version.
+
+ d) make other distribution arrangements with the Copyright Holder.
+
+5. You may charge a reasonable copying fee for any distribution of this
+Package. You may charge any fee you choose for support of this Package. You
+may not charge a fee for this Package itself. However, you may distribute this
+Package in aggregate with other (possibly commercial) programs as part of a
+larger (possibly commercial) software distribution provided that you do not
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+6. The scripts and library files supplied as input to or produced as output
+from the programs of this Package do not automatically fall under the copyright
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+
+7. C or perl subroutines supplied by you and linked into this Package shall not
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+
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+products derived from this software without specific prior written permission.
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+9. THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+
+The End
+
@@ -1,171 +0,0 @@
-package Algorithm::LUHN;
-
-use strict;
-use Exporter;
-
-use vars qw/$VERSION @ISA @EXPORT @EXPORT_OK $ERROR/;
-
-@ISA = qw/Exporter/;
-@EXPORT = qw//;
-@EXPORT_OK = qw/check_digit is_valid valid_chars/;
-
-$VERSION = '1.00';
-
-# The hash of valid characters.
-my %map = map { $_ => $_ } 0..9;
-
-=pod
-
-=head1 NAME
-
-Algorithm::LUHN - Calculate the Modulus 10 Double Add Double checksum
-
-=head1 SYNOPSIS
-
- use Algorithm::LUHN qw/check_digit is_valid/;
-
- $c = check_digit("43881234567");
- print "It works\n" if is_valid("43881234567$c");
-
- $c = check_digit("A2C4E6G8"); # this will cause an error
-
- print "Valid LUHN characters are:\n";
- my %vc = Algorithm::LUHN::valid_chars();
- for (sort keys %vc) {
- print "$_ => $vc{$_}\n";
- }
-
- Algorithm::LUHN::valid_chars(map {$_ => ord($_)-ord('A')+10} A..Z);
- $c = check_digit("A2C4E6G8");
- print "It worked again\n" if is_valid("A2C4E6G8$c");
-
-=head1 DESCRIPTION
-
-This module calculates the Modulus 10 Double Add Double checksum, also known as
-the LUHN Formula. This algorithm is used to verify credit card numbers and
-Standard & Poor's security identifiers such as CUSIP's and CSIN's.
-
-You can find plenty of information about the algorithm by searching the web for
-"modulus 10 double add double".
-
-=head1 FUNCTION
-
-=over 4
-
-=cut
-
-=item is_valid CHECKSUMMED_NUM
-
-This function returns true if the final character of CHECKSUMMED_NUM is the
-correct checksum for the rest of the number and false if not. Obviously the
-final character does not factor into the checksum calculation. False will also
-be returned if NUM contains in an invalid character as defined by
-valid_chars(). If NUM is not valid, $Algorithm::LUHN::ERROR will contain the
-reason.
-
-This function is equivalent to
-
- substr $N,length($N)-1 eq check_digit(substr $N,0,length($N)-1)
-
-=cut
-sub is_valid {
- my $N = shift;
- my $c = check_digit(substr($N, 0,length($N)-1));
- if (defined $c) {
- if (substr($N,length($N)-1, 1) eq $c) {
- return 1;
- } else {
- $ERROR = "Check digit incorrect. Expected $c";
- return '';
- }
- } else {
- # $ERROR will have been set by check_digit
- return '';
- }
-}
-
-=item check_digit NUM
-
-This function returns the checksum of the given number. If it cannot calculate
-the check_digit it will return undef and set $Algorithm::LUHN::ERROR to contain
-the reason why.
-
-=cut
-sub check_digit {
- my @buf = reverse split //, shift;
-
- my $totalVal = 0;
- my $flip = 1;
- foreach my $c (@buf) {
- unless (exists $map{$c}) {
- $ERROR = "Invalid character, '$c', in check_digit calculation";
- return;
- }
- my $posVal = $map{$c};
-
- $posVal *= 2 unless $flip = !$flip;
-
- while ($posVal) {
- $totalVal += $posVal % 10;
- $posVal = int($posVal / 10);
- }
- }
-
- return (10 - $totalVal % 10) % 10;
-}
-
-=item valid_chars LIST
-
-By default this module only recognizes 0..9 as valid characters, but sometimes
-you want to consider other characters as valid, e.g. Standard & Poor's
-identifers may contain 0..9, A..Z, @, #, *. This function allows you to add
-additional characters to the accepted list.
-
-LIST is a mapping of c<character> => c<value>. For example, Standard & Poor's
-maps A..Z to 10..35 so the LIST to add these valid characters would be (A, 10,
-B, 11, C, 12, ...)
-
-Please note that this I<adds> or I<re-maps> characters, so any characters
-already considered valid but not in LIST will remain valid.
-
-If you do not provide LIST, this function returns the current valid character
-map.
-
-=cut
-sub valid_chars {
- return %map unless @_;
- while (@_) {
- my ($k, $v) = splice @_, 0, 2;
- $map{$k} = $v;
- }
-}
-
-sub _dump_map {
- my %foo = valid_chars();
- my ($k,$v);
- print "$k => $v\n" while (($k, $v) = each %foo);
-}
-
-=back
-
-=cut
-
-1;
-
-__END__
-
-=head1 AUTHOR
-
-This module was written by
-Tim Ayers (http://search.cpan.org/search?author=TAYERS).
-
-=head1 COPYRIGHT
-
-Copyright (c) 2001 Tim Ayers. All rights reserved.
-
-=head1 LICENSE
-
-This program is free software; you can redistribute it and/or modify it under
-the same terms as Perl itself.
-
-=cut
@@ -1,8 +1,12 @@
+# This file was automatically generated by Dist::Zilla::Plugin::Manifest v5.019.
+Changes
+LICENSE
MANIFEST
-CHANGES
-LUHN.pm
-README
+META.yml
Makefile.PL
+README
+dist.ini
+lib/Algorithm/LUHN.pm
t/01-cc.t
t/02-vc.t
t/03-csp.t
@@ -0,0 +1,24 @@
+---
+abstract: 'Calculate the Modulus 10 Double Add Double checksum'
+author:
+ - 'Tim Ayers <tayers@cpan.org>'
+build_requires:
+ Test: '0'
+configure_requires:
+ ExtUtils::MakeMaker: '6.30'
+dynamic_config: 0
+generated_by: 'Dist::Zilla version 5.019, CPAN::Meta::Converter version 2.141170'
+license: perl
+meta-spec:
+ url: http://module-build.sourceforge.net/META-spec-v1.4.html
+ version: '1.4'
+name: Algorithm-LUHN
+requires:
+ Exporter: '0'
+ perl: '5.006'
+ strict: '0'
+ warnings: '0'
+resources:
+ homepage: https://github.com/neilbowers/Algorithm-LUHN
+ repository: https://github.com/neilbowers/Algorithm-LUHN.git
+version: '1.01'
@@ -1,12 +1,57 @@
-use ExtUtils::MakeMaker;
-WriteMakefile
- (NAME => 'Algorithm::LUHN',
- VERSION_FROM => 'LUHN.pm',
- PREREQ_PM => {Test => 0},
- dist =>
- {COMPRESS => 'gzip',
- SUFFIX => 'gz',
- },
-
- clean => {FILES => ".test*"},
- );
+
+# This file was automatically generated by Dist::Zilla::Plugin::MakeMaker v5.019.
+use strict;
+use warnings;
+
+use 5.006;
+
+use ExtUtils::MakeMaker 6.30;
+
+
+
+my %WriteMakefileArgs = (
+ "ABSTRACT" => "Calculate the Modulus 10 Double Add Double checksum",
+ "AUTHOR" => "Tim Ayers <tayers\@cpan.org>",
+ "CONFIGURE_REQUIRES" => {
+ "ExtUtils::MakeMaker" => "6.30"
+ },
+ "DISTNAME" => "Algorithm-LUHN",
+ "EXE_FILES" => [],
+ "LICENSE" => "perl",
+ "NAME" => "Algorithm::LUHN",
+ "PREREQ_PM" => {
+ "Exporter" => 0,
+ "strict" => 0,
+ "warnings" => 0
+ },
+ "TEST_REQUIRES" => {
+ "Test" => 0
+ },
+ "VERSION" => "1.01",
+ "test" => {
+ "TESTS" => "t/*.t"
+ }
+);
+
+
+my %FallbackPrereqs = (
+ "Exporter" => 0,
+ "Test" => 0,
+ "strict" => 0,
+ "warnings" => 0
+);
+
+
+unless ( eval { ExtUtils::MakeMaker->VERSION(6.63_03) } ) {
+ delete $WriteMakefileArgs{TEST_REQUIRES};
+ delete $WriteMakefileArgs{BUILD_REQUIRES};
+ $WriteMakefileArgs{PREREQ_PM} = \%FallbackPrereqs;
+}
+
+delete $WriteMakefileArgs{CONFIGURE_REQUIRES}
+ unless eval { ExtUtils::MakeMaker->VERSION(6.52) };
+
+WriteMakefile(%WriteMakefileArgs);
+
+
+
@@ -1,24 +1,15 @@
-DESCRIPTION
------------
-Algorithm::LUHN - Calculate the Modulus 10 Double Add Double checksum
-
-This module calculates the Modulus 10 Double Add Double checksum. This
-algorithm is used to verify credit card numbers and Standard & Poor's
-security identifiers such as CUSIP's and ISIN's.
-
-INSTALLATION
-------------
-This is a simple module. The typical installation routine should work fine.
-
- perl Makefile.PL
- make test
- make install
-
-COPYRIGHT
----------
-Copyright (c) 2001 Tim R. Ayers. All rights reserved.
-
-LICENSE
--------
-This program is free software; you can redistribute it and/or modify it under
-the same terms as Perl itself.
+
+
+This archive contains the distribution Algorithm-LUHN,
+version 1.01:
+
+ Calculate the Modulus 10 Double Add Double checksum
+
+This software is copyright (c) 2001 by Tim Ayers.
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.
+
+
+This README file was generated by Dist::Zilla::Plugin::Readme v5.019.
+
@@ -0,0 +1,12 @@
+name = Algorithm-LUHN
+author = Tim Ayers <tayers@cpan.org>
+license = Perl_5
+copyright_holder = Tim Ayers
+copyright_year = 2001
+
+version = 1.01
+
+[@Basic]
+[PkgVersion]
+[AutoPrereqs]
+[GithubMeta]
@@ -0,0 +1,209 @@
+package Algorithm::LUHN;
+$Algorithm::LUHN::VERSION = '1.01';
+use 5.006;
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA = qw/Exporter/;
+our @EXPORT = qw//;
+our @EXPORT_OK = qw/check_digit is_valid valid_chars/;
+our $ERROR;
+
+# The hash of valid characters.
+my %map = map { $_ => $_ } 0..9;
+
+=pod
+
+=head1 NAME
+
+Algorithm::LUHN - Calculate the Modulus 10 Double Add Double checksum
+
+=head1 SYNOPSIS
+
+ use Algorithm::LUHN qw/check_digit is_valid/;
+
+ $c = check_digit("43881234567");
+ print "It works\n" if is_valid("43881234567$c");
+
+ $c = check_digit("A2C4E6G8"); # this will cause an error
+
+ print "Valid LUHN characters are:\n";
+ my %vc = Algorithm::LUHN::valid_chars();
+ for (sort keys %vc) {
+ print "$_ => $vc{$_}\n";
+ }
+
+ Algorithm::LUHN::valid_chars(map {$_ => ord($_)-ord('A')+10} A..Z);
+ $c = check_digit("A2C4E6G8");
+ print "It worked again\n" if is_valid("A2C4E6G8$c");
+
+=head1 DESCRIPTION
+
+This module calculates the Modulus 10 Double Add Double checksum, also known as
+the LUHN Formula. This algorithm is used to verify credit card numbers and
+Standard & Poor's security identifiers such as CUSIP's and CSIN's.
+
+You can find plenty of information about the algorithm by searching the web for
+"modulus 10 double add double".
+
+=head1 FUNCTION
+
+=over 4
+
+=cut
+
+=item is_valid CHECKSUMMED_NUM
+
+This function takes a credit-card number and returns true if
+the number passes the LUHN check.
+
+Ie it returns true if the final character of CHECKSUMMED_NUM is the
+correct checksum for the rest of the number and false if not. Obviously the
+final character does not factor into the checksum calculation. False will also
+be returned if NUM contains in an invalid character as defined by
+valid_chars(). If NUM is not valid, $Algorithm::LUHN::ERROR will contain the
+reason.
+
+This function is equivalent to
+
+ substr $N,length($N)-1 eq check_digit(substr $N,0,length($N)-1)
+
+For example, C<4242 4242 4242 4242> is a valid Visa card number,
+that is provided for test purposes. The final digit is '2',
+which is the right check digit. If you change it to a '3', it's not
+a valid card number. Ie:
+
+ is_valid('4242424242424242'); # true
+ is_valid('4242424242424243'); # false
+
+=cut
+
+sub is_valid {
+ my $N = shift;
+ my $c = check_digit(substr($N, 0,length($N)-1));
+ if (defined $c) {
+ if (substr($N,length($N)-1, 1) eq $c) {
+ return 1;
+ } else {
+ $ERROR = "Check digit incorrect. Expected $c";
+ return '';
+ }
+ } else {
+ # $ERROR will have been set by check_digit
+ return '';
+ }
+}
+
+=item check_digit NUM
+
+This function returns the checksum of the given number. If it cannot calculate
+the check_digit it will return undef and set $Algorithm::LUHN::ERROR to contain
+the reason why.
+
+=cut
+sub check_digit {
+ my @buf = reverse split //, shift;
+
+ my $totalVal = 0;
+ my $flip = 1;
+ foreach my $c (@buf) {
+ unless (exists $map{$c}) {
+ $ERROR = "Invalid character, '$c', in check_digit calculation";
+ return;
+ }
+ my $posVal = $map{$c};
+
+ $posVal *= 2 unless $flip = !$flip;
+
+ while ($posVal) {
+ $totalVal += $posVal % 10;
+ $posVal = int($posVal / 10);
+ }
+ }
+
+ return (10 - $totalVal % 10) % 10;
+}
+
+=item valid_chars LIST
+
+By default this module only recognizes 0..9 as valid characters, but sometimes
+you want to consider other characters as valid, e.g. Standard & Poor's
+identifers may contain 0..9, A..Z, @, #, *. This function allows you to add
+additional characters to the accepted list.
+
+LIST is a mapping of c<character> => c<value>. For example, Standard & Poor's
+maps A..Z to 10..35 so the LIST to add these valid characters would be (A, 10,
+B, 11, C, 12, ...)
+
+Please note that this I<adds> or I<re-maps> characters, so any characters
+already considered valid but not in LIST will remain valid.
+
+If you do not provide LIST, this function returns the current valid character
+map.
+
+=cut
+sub valid_chars {
+ return %map unless @_;
+ while (@_) {
+ my ($k, $v) = splice @_, 0, 2;
+ $map{$k} = $v;
+ }
+}
+
+sub _dump_map {
+ my %foo = valid_chars();
+ my ($k,$v);
+ print "$k => $v\n" while (($k, $v) = each %foo);
+}
+
+=back
+
+=cut
+
+1;
+
+__END__
+
+=head1 SEE ALSO
+
+L<Algorithm::CheckDigits> provides a front-end to a large collection
+of modules for working with check digits.
+
+L<Business::CreditCard> provides three functions for checking credit
+card numbers. L<Business::CreditCard::Object> provides an OO interface
+to those functions.
+
+L<Business::CardInfo> provides a class for holding credit card details,
+and has a type constraint on the card number, to ensure it passes the
+LUHN check.
+
+L<Business::CCCheck> provides a number of functions for checking
+credit card numbers.
+
+L<Regexp::Common> supports combined LUHN and issuer checking
+against a card number.
+
+I have also written a
+L<review of LUHN modules|http://neilb.org/reviews/luhn.html>,
+which covers them in more detail than this section.
+
+=head1 REPOSITORY
+
+L<https://github.com/neilbowers/Algorithm-LUHN>
+
+=head1 AUTHOR
+
+This module was written by
+Tim Ayers (http://search.cpan.org/search?author=TAYERS).
+
+=head1 COPYRIGHT
+
+Copyright (c) 2001 Tim Ayers. All rights reserved.
+
+=head1 LICENSE
+
+This program is free software; you can redistribute it and/or modify it under
+the same terms as Perl itself.
+
+=cut