# Copyright 2011, 2012, 2013, 2014 Kevin Ryde
# This file is part of Math-NumSeq.
#
# Math-NumSeq is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3, or (at your option) any later
# version.
#
# Math-NumSeq is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with Math-NumSeq. If not, see <http://www.gnu.org/licenses/>.
# my $catalogue = Math::Values::OeisCatalogue->new(exclude_files=>1);
#
package Math::NumSeq::OEIS::Catalogue;
use 5.004;
use strict;
use List::Util;
# uncomment this to run the ### lines
#use Smart::Comments;
use Module::Pluggable require => 1;
my @plugins = sort __PACKAGE__->plugins;
### @plugins
use vars '$VERSION';
$VERSION = 72;
# sub seq_to_num {
# my ($class, $num) = @_;
# }
sub anum_to_info {
my ($class, $anum) = @_;
### Catalogue anum_to_info(): $anum
foreach my $plugin (@plugins) {
### $plugin
if (my $info = $plugin->anum_to_info($anum)) {
return $info;
}
}
return undef;
}
sub anum_list {
my ($class) = @_;
my %ret;
foreach my $plugin (@plugins) {
### $plugin
foreach my $info (@{$plugin->info_arrayref}) {
$ret{$info->{'anum'}} = 1;
}
}
my @ret = sort {$a<=>$b} keys %ret;
return @ret;
}
sub _method_apply {
my $acc = shift;
my $method = shift;
### plugin anums: map {$_->$method(@_)} @plugins
return $acc->(grep {defined} map {$_->$method(@_)} @plugins);
}
sub anum_after {
my ($class, $after_anum) = @_;
### Catalogue anum_after(): $after_anum
_method_apply (\&List::Util::minstr, 'anum_after', $after_anum);
}
sub anum_before {
my ($class, $before_anum) = @_;
_method_apply (\&List::Util::maxstr, 'anum_before', $before_anum);
}
sub anum_first {
my ($class) = @_;
_method_apply (\&List::Util::minstr, 'anum_first');
}
sub anum_last {
my ($class) = @_;
_method_apply (\&List::Util::maxstr, 'anum_last');
}
# sub anum_to_class {
# my ($class, $anum) = @_;
# ### anum_to_class(): @_
# my @ret;
# foreach my $plugin (@plugins) {
# ### $plugin
# my $href = $plugin->anum_to_class_hashref;
# if (my $aref = $href->{$anum}) {
# return @$aref;
# }
# }
# return;
# }
#
# sub _file_anum_list {
# my ($class) = @_;
# ### anum_list()
# my %ret;
# foreach my $plugin (@plugins) {
# ### $plugin
# my $href = $plugin->anum_to_class_hashref;
# %ret = (%ret, %$href);
# }
# return sort keys %ret;
# }
1;
__END__
=for stopwords Ryde Math-NumSeq NumSeq OEIS
=head1 NAME
Math::NumSeq::OEIS::Catalogue -- available A-numbers
=head1 SYNOPSIS
use Math::NumSeq::OEIS::Catalogue;
my $anum = Math::NumSeq::OEIS::Catalogue->anum_first;
my $anum_next = Math::NumSeq::OEIS::Catalogue->anum_after($anum);
=head1 DESCRIPTION
This module lists the A-numbers available for C<Math::NumSeq::OEIS>. It
includes those available from NumSeq module code and those available from
files.
A-numbers are handled as strings like "A000032". Six digits is usual,
though rumour has it the plan is for seven digits like "A1000000" when the
millionth sequence is reached.
Add-on distributions can extend the catalogue by creating a plugin module.
See L<Math::NumSeq::OEIS::Catalogue::Plugin> for details.
=head1 FUNCTIONS
=over
=item C<$anum = Math::NumSeq::OEIS::Catalogue-E<gt>anum_first()>
=item C<$anum = Math::NumSeq::OEIS::Catalogue-E<gt>anum_last()>
Return the first, or last, A-number available.
=item C<$anum = Math::NumSeq::OEIS::Catalogue-E<gt>anum_before ($anum)>
=item C<$anum = Math::NumSeq::OEIS::Catalogue-E<gt>anum_after ($anum)>
Return the A-number before, or after, a given C<$anum>. Return C<undef> if
there's no more A-numbers in the respective direction.
=back
=head1 SEE ALSO
L<Math::NumSeq::OEIS>
=head1 HOME PAGE
http://user42.tuxfamily.org/math-numseq/index.html
=head1 LICENSE
Copyright 2010, 2011, 2012, 2013, 2014 Kevin Ryde
Math-NumSeq is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
Math-NumSeq is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
Math-NumSeq. If not, see <http://www.gnu.org/licenses/>.
=cut