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Pod::Elemental::Transformer::Nester(3pm) User Contributed Perl Documentation Pod::Elemental::Transformer::Nester(3pm)

NAME

Pod::Elemental::Transformer::Nester - group the document into sections

VERSION

version 0.103006

OVERVIEW

The Nester transformer is meant to find potential container elements and make them into actual containers. It works by being told what elements may be made into containers and what subsequent elements they should allow to be stuffed into them.

For example, given the following nester:

  use Pod::Elemental::Selectors qw(s_command s_flat);
  my $nester = Pod::Elemental::Transformer::Nester->new({
    top_selector      => s_command('head1'),
    content_selectors => [
      s_command([ qw(head2 head3 head4) ]),
      s_flat,
    ],
  });

..then when we apply the transformation:

  $nester->transform_node($document);

...the nester will find all "=head1" elements in the top-level of the document. It will ensure that they are represented by objects that perform the Pod::Elemental::Node role, and then it will move all subsequent elements matching the "content_selectors" into the container.

So, if we start with this input:

  =head1 Header
  =head2 Subheader
  Pod5::Ordinary <some content>
  =head1 New Header

The nester will convert its structure to look like this:

  =head1 Header
    =head2 Subheader
    Pod5::Ordinary <some content>
  =head1 New Header

Once an element is reached that does not pass the content selectors, the nesting ceases until the next potential container.

PERL VERSION

This library should run on perls released even a long time ago. It should work on any version of perl released in the last five years.

Although it may work on older versions of perl, no guarantee is made that the minimum required version will not be increased. The version may be increased for any reason, and there is no promise that patches will be accepted to lower the minimum required perl.

ATTRIBUTES

top_selector

This attribute must be a coderef (presumably made from Pod::Elemental::Selectors) that will test elements in the transformed node and return true if the element is a potential new container.

content_selectors

This attribute must be an arrayref of coderefs (again presumably made from Pod::Elemental::Selectors) that will test whether paragraphs subsequent to the top-level container may be moved under the container.

AUTHOR

Ricardo SIGNES <cpan@semiotic.systems>

COPYRIGHT AND LICENSE

This software is copyright (c) 2022 by Ricardo SIGNES.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

2023-01-05 perl v5.36.0