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package HTML::HTML5::Outline::RDF;
use 5.008;
use strict;
use base qw[Exporter];
use constant NMTOKEN => 'http://www.w3.org/2001/XMLSchema#NMTOKEN';
use constant PROP_TITLE => 'http://purl.org/dc/terms/title';
use constant PROP_TAG => 'http://ontologi.es/outline#tag';
use constant RDF_FIRST => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#first';
use constant RDF_REST => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#rest';
use constant RDF_NIL => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#nil';
use constant REL_ASIDE => 'http://ontologi.es/outline#aside';
use constant REL_BQ => 'http://ontologi.es/outline#blockquote';
use constant REL_FIGURE => 'http://ontologi.es/outline#figure';
use constant REL_HEADING => 'http://ontologi.es/outline#heading';
use constant REL_IPART => 'http://ontologi.es/outline#ipart';
use constant REL_PART => 'http://ontologi.es/outline#part';
use constant REL_PARTLIST => 'http://ontologi.es/outline#part-list';
use constant REL_SECTION => 'http://ontologi.es/outline#section';
use constant REL_TYPE => 'http://purl.org/dc/terms/type';
use constant TYPE_DATASET => 'http://purl.org/dc/dcmitype/Dataset';
use constant TYPE_IMAGE => 'http://purl.org/dc/dcmitype/Image';
use constant TYPE_TEXT => 'http://purl.org/dc/dcmitype/Text';
our $VERSION = '0.006';
our (@EXPORT, %EXPORT_TAGS, @EXPORT_OK);
BEGIN
{
@EXPORT = qw();
%EXPORT_TAGS = ('constants' => [qw(NMTOKEN PROP_TITLE PROP_TAG
RDF_FIRST RDF_REST RDF_NIL TYPE_DATASET TYPE_IMAGE TYPE_TEXT
REL_ASIDE REL_BQ REL_FIGURE REL_HEADING REL_IPART REL_PART
REL_PARTLIST REL_SECTION REL_TYPE)]);
@EXPORT_OK = @{$EXPORT_TAGS{'constants'}};
}
package HTML::HTML5::Outline;
use strict;
use RDF::Trine;
BEGIN { HTML::HTML5::Outline::RDF->import(':constants'); }
sub to_rdf
{
my ($self) = @_;
return $self->{model} if defined $self->{model};
$self->{model} = RDF::Trine::Model->temporary_model;
my $page_url = $self->{options}->{uri};
my $outline = $self->primary_outlinee;
my $outline_node = $outline->add_to_model($self->{model});
$self->{model}->add_statement(RDF::Trine::Statement->new(
RDF::Trine::Node::Resource->new($page_url),
RDF::Trine::Node::Resource->new(REL_IPART),
$outline_node,
))
unless ($outline_node->is_resource and $outline_node->uri eq $page_url);
return $self->{model};
}
sub _add_partlist_to_model
{
my ($self, $section, $model, @partlist) = @_;
return if $self->{options}->{suppress_collections};
if (!@partlist)
{
$model->add_statement(RDF::Trine::Statement->new(
$section->{trine_node},
RDF::Trine::Node::Resource->new(REL_PARTLIST),
RDF::Trine::Node::Resource->new(RDF_NIL),
));
return;
}
my @sorted = reverse sort { $a->order <=> $b->order } @partlist;
my $rest = RDF::Trine::Node::Resource->new(RDF_NIL);
foreach my $item (@sorted)
{
my $list = RDF::Trine::Node::Blank->new;
$model->add_statement(RDF::Trine::Statement->new(
$list,
RDF::Trine::Node::Resource->new(RDF_FIRST),
$item->{trine_node},
));
$model->add_statement(RDF::Trine::Statement->new(
$list,
RDF::Trine::Node::Resource->new(RDF_REST),
$rest,
));
$rest = $list;
}
$model->add_statement(RDF::Trine::Statement->new(
$section->{trine_node},
RDF::Trine::Node::Resource->new(REL_PARTLIST),
$rest,
));
}
sub _node_for_element
{
my ($self, $element) = @_;
my $np = $element->nodePath;
unless ($self->{element_subjects}{$np})
{
$self->{element_subjects}{$np} =
$element->hasAttribute('id') && length $element->getAttribute('id')
? RDF::Trine::Node::Resource->new($self->{options}{uri}.'#'.$element->getAttribute('id'))
: RDF::Trine::Node::Blank->new;
}
if (!ref $self->{element_subjects}{$np})
{
if ($self->{element_subjects}{$np} =~ /^_:(.+)$/)
{
$self->{element_subjects}{$np} = RDF::Trine::Node::Blank->new($1);
}
else
{
$self->{element_subjects}{$np} = RDF::Trine::Node::Resource->new($self->{element_subjects}{$np});
}
}
return $self->{element_subjects}{$np};
}
package HTML::HTML5::Outline::Section;
use strict;
use RDF::Trine;
BEGIN { HTML::HTML5::Outline::RDF->import(':constants'); }
sub add_to_model
{
my ($self, $model) = @_;
$self->{trine_node} = my $self_node = RDF::Trine::Node::Blank->new;
$self->{trine_node_for_header} = my $header_node = $self->outliner->_node_for_element($self->header);
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new(PROP_TITLE),
RDF::Trine::Node::Literal->new($self->heading, $self->outliner->_node_lang($self->header)),
));
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new(REL_TYPE),
RDF::Trine::Node::Resource->new(TYPE_TEXT),
));
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new(REL_HEADING),
$header_node,
));
$model->add_statement(RDF::Trine::Statement->new(
$header_node,
RDF::Trine::Node::Resource->new(PROP_TAG),
RDF::Trine::Node::Literal->new($self->header->tagName, undef, NMTOKEN),
));
my @partlist;
foreach my $child (@{$self->{sections}})
{
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new(REL_PART),
$child->add_to_model($model),
));
push @partlist, $child;
}
foreach my $e (@{$self->{elements}})
{
my $E = HTML::HTML5::Outline::k($e);
if ($self->outliner->{outlines}->{$E})
{
my $rel = REL_IPART;
$rel = REL_ASIDE if lc $e->tagName eq 'aside';
$rel = REL_BQ if lc $e->tagName eq 'blockquote';
$rel = REL_FIGURE if lc $e->tagName eq 'figure';
$rel = REL_SECTION if lc $e->tagName eq 'section';
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new($rel),
$self->outliner->{outlines}->{$E}->add_to_model($model),
));
push @partlist, $self->outliner->{outlines}->{$E};
}
}
$self->outliner->_add_partlist_to_model($self, $model, @partlist);
return $self_node;
}
package HTML::HTML5::Outline::Outlinee;
use strict;
use RDF::Trine;
BEGIN { HTML::HTML5::Outline::RDF->import(':constants'); }
sub add_to_model
{
my ($self, $model) = @_;
my $rdf_type = TYPE_TEXT;
if ($self->element->localname eq 'figure'
|| ($self->element->getAttribute('class')||'') =~ /\bfigure\b/)
{
$rdf_type = TYPE_IMAGE;
}
elsif ($self->element->localname =~ /^(ul|ol)$/i
&& ($self->element->getAttribute('class')||'') =~ /\bxoxo\b/)
{
$rdf_type = TYPE_DATASET;
}
my $self_node = $self->outliner->_node_for_element($self->element);
$self->{trine_node} = $self_node;
if ($self->element->localname =~ /^(body|html)$/i)
{
$self_node = RDF::Trine::Node::Resource->new($self->outliner->{options}->{uri});
}
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new(PROP_TAG),
RDF::Trine::Node::Literal->new($self->element->localname, undef, NMTOKEN),
))
unless $self->element->localname =~ /^(body|html)$/i;
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new(REL_TYPE),
RDF::Trine::Node::Resource->new($rdf_type),
));
my @partlist;
foreach my $section (@{$self->{sections}})
{
$model->add_statement(RDF::Trine::Statement->new(
$self_node,
RDF::Trine::Node::Resource->new(REL_PART),
$section->add_to_model($model),
));
push @partlist, $section;
}
$self->outliner->_add_partlist_to_model($self, $model, @partlist);
return $self_node;
}
1;
__END__
=head1 NAME
HTML::HTML5::Outline::RDF - RDF-related methods
=head1 DESCRIPTION
Some of the RDF-related functionality of C<HTML::HTML5::Outline> is split
out into this module so that the basic outline functionality can still be
used if C<RDF::Trine> is not installed.
RDF support can be disabled using:
use HTML::HTML5::Outline rdf => 0;
No user-servicable parts within.
=head1 SEE ALSO
L<HTML::HTML5::Outline>.
L<RDF::Trine>, L<RDF::RDFa::Parser>, L<http://www.perlrdf.org/>.
=head1 AUTHOR
Toby Inkster, E<lt>tobyink@cpan.orgE<gt>
=head1 COPYRIGHT AND LICENCE
Copyright (C) 2008-2011 by Toby Inkster
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
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