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<?php
/**
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
*/
use Wikimedia\Purtle\RdfWriter;
/**
* Helper class to produce RDF representation of categories.
*/
class CategoriesRdf {
/**
* Prefix used for Mediawiki ontology in the dump.
*/
const ONTOLOGY_PREFIX = 'mediawiki';
/**
* Base URL for Mediawiki ontology.
*/
const ONTOLOGY_URL = 'https://www.mediawiki.org/ontology#';
/**
* OWL description of the ontology.
*/
const OWL_URL = 'https://www.mediawiki.org/ontology/ontology.owl';
/**
* Current version of the dump format.
*/
const FORMAT_VERSION = "1.1";
/**
* Special page for Dump identification.
* Used as head URI for each wiki's category dump, e.g.:
* https://en.wikipedia.org/wiki/Special:CategoryDump
*/
const SPECIAL_DUMP = 'Special:CategoryDump';
/**
* @var RdfWriter
*/
private $rdfWriter;
public function __construct( RdfWriter $writer ) {
$this->rdfWriter = $writer;
}
/**
* Setup prefixes relevant for the dump
*/
public function setupPrefixes() {
$this->rdfWriter->prefix( self::ONTOLOGY_PREFIX, self::ONTOLOGY_URL );
$this->rdfWriter->prefix( 'rdfs', 'http://www.w3.org/2000/01/rdf-schema#' );
$this->rdfWriter->prefix( 'owl', 'http://www.w3.org/2002/07/owl#' );
$this->rdfWriter->prefix( 'schema', 'http://schema.org/' );
$this->rdfWriter->prefix( 'cc', 'http://creativecommons.org/ns#' );
}
/**
* Write RDF data for link between categories.
* @param string $fromName Child category name
* @param string $toName Parent category name
*/
public function writeCategoryLinkData( $fromName, $toName ) {
$titleFrom = Title::makeTitle( NS_CATEGORY, $fromName );
$titleTo = Title::makeTitle( NS_CATEGORY, $toName );
$this->rdfWriter->about( $this->titleToUrl( $titleFrom ) )
->say( self::ONTOLOGY_PREFIX, 'isInCategory' )
->is( $this->titleToUrl( $titleTo ) );
}
/**
* Write out the data for single category.
* @param string $categoryName Category name
* @param bool $isHidden Hidden category?
* @param int $pages Page count (note this includes only Wiki articles, not subcats or files)
* @param int $subcategories Subcategory count
*/
public function writeCategoryData( $categoryName, $isHidden, $pages, $subcategories ) {
$title = Title::makeTitle( NS_CATEGORY, $categoryName );
$this->rdfWriter->about( $this->titleToUrl( $title ) )
->say( 'a' )
->is( self::ONTOLOGY_PREFIX, 'Category' );
if ( $isHidden ) {
$this->rdfWriter->is( self::ONTOLOGY_PREFIX, 'HiddenCategory' );
}
$titletext = $title->getText();
$this->rdfWriter->say( 'rdfs', 'label' )->value( $titletext );
$this->rdfWriter->say( self::ONTOLOGY_PREFIX, 'pages' )->value( $pages );
$this->rdfWriter->say( self::ONTOLOGY_PREFIX, 'subcategories' )->value( $subcategories );
// TODO: do we want files too here? Easy to add, but don't have use case so far.
}
/**
* Make URL from title label
* @param string $titleLabel Short label (without namespace) of the category
* @return string URL for the category
*/
public function labelToUrl( $titleLabel ) {
return $this->titleToUrl( Title::makeTitle( NS_CATEGORY, $titleLabel ) );
}
/**
* Convert Title to link to target page.
* @param Title $title
* @return string URL for the category
*/
private function titleToUrl( Title $title ) {
return $title->getFullURL( '', false, PROTO_CANONICAL );
}
/**
* Get URI of the dump for this particular wiki.
* @return false|string
*/
public function getDumpURI() {
return $this->titleToUrl( Title::makeTitle( NS_MAIN, self::SPECIAL_DUMP ) );
}
}
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