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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 MediaWiki\Category\CategoriesRdf;
use MediaWiki\MainConfigNames;
use MediaWiki\Maintenance\Maintenance;
use Wikimedia\Purtle\RdfWriter;
use Wikimedia\Purtle\RdfWriterFactory;
use Wikimedia\Rdbms\IReadableDatabase;
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
/**
* Maintenance script to provide RDF representation of the category tree.
*
* @ingroup Maintenance
* @since 1.30
*/
class DumpCategoriesAsRdf extends Maintenance {
/**
* @var RdfWriter
*/
private $rdfWriter;
/**
* Categories RDF helper.
* @var CategoriesRdf
*/
private $categoriesRdf;
public function __construct() {
parent::__construct();
$this->addDescription( "Generate RDF dump of categories in a wiki." );
$this->setBatchSize( 200 );
$this->addOption( 'output', "Output file (default is stdout). Will be overwritten.",
false, true );
$this->addOption( 'format', "Set the dump format.", false, true );
}
/**
* Produce row iterator for categories.
* @param IReadableDatabase $dbr
* @param string $fname Name of the calling function
* @return RecursiveIterator
*/
public function getCategoryIterator( IReadableDatabase $dbr, $fname ) {
$it = new BatchRowIterator(
$dbr,
$dbr->newSelectQueryBuilder()
->from( 'page' )
->leftJoin( 'page_props', null, [ 'pp_propname' => 'hiddencat', 'pp_page = page_id' ] )
->leftJoin( 'category', null, [ 'cat_title = page_title' ] )
->select( [
'page_title',
'page_id',
'pp_propname',
'cat_pages',
'cat_subcats',
'cat_files'
] )
->where( [
'page_namespace' => NS_CATEGORY,
] )
->caller( $fname ),
[ 'page_title' ],
$this->getBatchSize()
);
return $it;
}
/**
* Get iterator for links for categories.
* @param IReadableDatabase $dbr
* @param int[] $ids List of page IDs
* @param string $fname Name of the calling function
* @return Traversable
*/
public function getCategoryLinksIterator( IReadableDatabase $dbr, array $ids, $fname ) {
$it = new BatchRowIterator(
$dbr,
$dbr->newSelectQueryBuilder()
->from( 'categorylinks' )
->select( [ 'cl_from', 'cl_to' ] )
->where( [
'cl_type' => 'subcat',
'cl_from' => $ids
] )
->caller( $fname ),
[ 'cl_from', 'cl_to' ],
$this->getBatchSize()
);
return new RecursiveIteratorIterator( $it );
}
/**
* @param int $timestamp
*/
public function addDumpHeader( $timestamp ) {
$licenseUrl = $this->getConfig()->get( MainConfigNames::RightsUrl );
if ( str_starts_with( $licenseUrl, '//' ) ) {
$licenseUrl = 'https:' . $licenseUrl;
}
$urlUtils = $this->getServiceContainer()->getUrlUtils();
$this->rdfWriter->about( $this->categoriesRdf->getDumpURI() )
->a( 'schema', 'Dataset' )
->a( 'owl', 'Ontology' )
->say( 'cc', 'license' )->is( $licenseUrl )
->say( 'schema', 'softwareVersion' )->value( CategoriesRdf::FORMAT_VERSION )
->say( 'schema', 'dateModified' )
->value( wfTimestamp( TS_ISO_8601, $timestamp ), 'xsd', 'dateTime' )
->say( 'schema', 'isPartOf' )->is( (string)$urlUtils->expand( '/', PROTO_CANONICAL ) )
->say( 'owl', 'imports' )->is( CategoriesRdf::OWL_URL );
}
public function execute() {
$outFile = $this->getOption( 'output', 'php://stdout' );
if ( $outFile === '-' ) {
$outFile = 'php://stdout';
}
$output = fopen( $outFile, 'w' );
$this->rdfWriter = $this->createRdfWriter( $this->getOption( 'format', 'ttl' ) );
$this->categoriesRdf = new CategoriesRdf( $this->rdfWriter );
$this->categoriesRdf->setupPrefixes();
$this->rdfWriter->start();
$this->addDumpHeader( time() );
fwrite( $output, $this->rdfWriter->drain() );
$dbr = $this->getDB( DB_REPLICA, [ 'vslow' ] );
foreach ( $this->getCategoryIterator( $dbr, __METHOD__ ) as $batch ) {
$pages = [];
foreach ( $batch as $row ) {
$this->categoriesRdf->writeCategoryData(
$row->page_title,
$row->pp_propname === 'hiddencat',
(int)$row->cat_pages - (int)$row->cat_subcats - (int)$row->cat_files,
(int)$row->cat_subcats
);
if ( $row->page_id ) {
$pages[$row->page_id] = $row->page_title;
}
}
foreach ( $this->getCategoryLinksIterator( $dbr, array_keys( $pages ), __METHOD__ ) as $row ) {
$this->categoriesRdf->writeCategoryLinkData( $pages[$row->cl_from], $row->cl_to );
}
fwrite( $output, $this->rdfWriter->drain() );
}
fflush( $output );
if ( $outFile !== '-' ) {
fclose( $output );
}
}
/**
* @param string $format Writer format
* @return RdfWriter
*/
private function createRdfWriter( $format ) {
$factory = new RdfWriterFactory();
return $factory->getWriter( $factory->getFormatName( $format ) );
}
}
// @codeCoverageIgnoreStart
$maintClass = DumpCategoriesAsRdf::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd