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lib/PDL/Perldl2/Plugin/NiceSlice.pm  view on Meta::CPAN

package PDL::Perldl2::Plugin::NiceSlice;

use strict;
use warnings;
use Devel::REPL::Plugin;

use namespace::clean -except => [ 'meta' ];

use PDL::Lite;
use PDL::NiceSlice;

my $preproc = sub {
   my ($txt) = @_;
   my $new = PDL::NiceSlice::perldlpp('main',$txt);
   return $new;
};

around 'compile' => sub {

  my ($orig, $self) = (shift, shift);
  my ($lines, @args) = @_;

  no PDL::NiceSlice;
  $lines = $preproc->($lines);

  $self->$orig($lines, @args);
};

1;

__END__

=head1 NAME

PDL::Perldl2::Plugin::NiceSlice - enable PDL NiceSlice syntax

=head1 DESCRIPTION

This plugin enables one to use the PDL::NiceSlice syntax in an
instance of C<Devel::REPL> such as the new Perldl2 shell, C<pdl2>.
Without the plugin, array slicing looks like this:
    
  pdl> use PDL;
  
  pdl> $x = sequence(10);
  $PDL1 = [0 1 2 3 4 5 6 7 8 9];
  
  pdl> $x->slice("2:9:2");
  $PDL1 = [2 4 6 8];

After the NiceSlice plugin has been loaded, you can use this:

  pdl> $x(2:9:2)
  $PDL1 = [2 4 6 8];

=head1 CAVEATS

C<PDL::NiceSlice> uses Perl source preprocessing.
If you need 100% pure Perl compatibility, use the
slice method instead.

=head1 SEE ALSO

C<PDL::NiceSlice>, C<Devel::REPL>, C<PDL::Perldl>