wikimedia/mediawiki-core

<?php
/**
 * Copyright © 2007 Roan Kattouw <roan.kattouw@gmail.com>
 *
 * 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
 *
 * @file
 */

use MediaWiki\Title\Title;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\ParamValidator\TypeDef\IntegerDef;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\LikeValue;

/**
 * Query module to enumerate all categories, even the ones that don't have
 * category pages.
 *
 * @ingroup API
 */
class ApiQueryAllCategories extends ApiQueryGeneratorBase {

    /**
     * @param ApiQuery $query
     * @param string $moduleName
     */
    public function __construct( ApiQuery $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'ac' );
    }

    public function execute() {
        $this->run();
    }

    public function getCacheMode( $params ) {
        return 'public';
    }

    public function executeGenerator( $resultPageSet ) {
        $this->run( $resultPageSet );
    }

    /**
     * @param ApiPageSet|null $resultPageSet
     */
    private function run( $resultPageSet = null ) {
        $db = $this->getDB();
        $params = $this->extractRequestParams();

        $this->addTables( 'category' );
        $this->addFields( 'cat_title' );

        if ( $params['continue'] !== null ) {
            $cont = $this->parseContinueParamOrDie( $params['continue'], [ 'string' ] );
            $op = $params['dir'] == 'descending' ? '<=' : '>=';
            $this->addWhere( $db->expr( 'cat_title', $op, $cont[0] ) );
        }

        $dir = ( $params['dir'] == 'descending' ? 'older' : 'newer' );
        $from = ( $params['from'] === null
            ? null
            : $this->titlePartToKey( $params['from'], NS_CATEGORY ) );
        $to = ( $params['to'] === null
            ? null
            : $this->titlePartToKey( $params['to'], NS_CATEGORY ) );
        $this->addWhereRange( 'cat_title', $dir, $from, $to );

        $min = $params['min'];
        $max = $params['max'];
        if ( $dir == 'newer' ) {
            $this->addWhereRange( 'cat_pages', 'newer', $min, $max );
        } else {
            $this->addWhereRange( 'cat_pages', 'older', $max, $min );
        }

        if ( isset( $params['prefix'] ) ) {
            $this->addWhere(
                $db->expr(
                    'cat_title',
                    IExpression::LIKE,
                    new LikeValue( $this->titlePartToKey( $params['prefix'], NS_CATEGORY ), $db->anyString() )
                )
            );
        }

        $this->addOption( 'LIMIT', $params['limit'] + 1 );
        $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
        $this->addOption( 'ORDER BY', 'cat_title' . $sort );

        $prop = array_fill_keys( $params['prop'], true );
        $this->addFieldsIf( [ 'cat_pages', 'cat_subcats', 'cat_files' ], isset( $prop['size'] ) );
        if ( isset( $prop['hidden'] ) ) {
            $this->addTables( [ 'page', 'page_props' ] );
            $this->addJoinConds( [
                'page' => [ 'LEFT JOIN', [
                    'page_namespace' => NS_CATEGORY,
                    'page_title=cat_title' ] ],
                'page_props' => [ 'LEFT JOIN', [
                    'pp_page=page_id',
                    'pp_propname' => 'hiddencat' ] ],
            ] );
            $this->addFields( [ 'cat_hidden' => 'pp_propname' ] );
        }

        $res = $this->select( __METHOD__ );

        $pages = [];

        $result = $this->getResult();
        $count = 0;
        foreach ( $res as $row ) {
            if ( ++$count > $params['limit'] ) {
                // We've reached the one extra which shows that there are
                // additional cats to be had. Stop here...
                $this->setContinueEnumParameter( 'continue', $row->cat_title );
                break;
            }

            // Normalize titles
            $titleObj = Title::makeTitle( NS_CATEGORY, $row->cat_title );
            if ( $resultPageSet !== null ) {
                $pages[] = $titleObj;
            } else {
                $item = [];
                ApiResult::setContentValue( $item, 'category', $titleObj->getText() );
                if ( isset( $prop['size'] ) ) {
                    $item['size'] = (int)$row->cat_pages;
                    $item['pages'] = $row->cat_pages - $row->cat_subcats - $row->cat_files;
                    $item['files'] = (int)$row->cat_files;
                    $item['subcats'] = (int)$row->cat_subcats;
                }
                if ( isset( $prop['hidden'] ) ) {
                    $item['hidden'] = (bool)$row->cat_hidden;
                }
                $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $item );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'continue', $row->cat_title );
                    break;
                }
            }
        }

        if ( $resultPageSet === null ) {
            $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'c' );
        } else {
            $resultPageSet->populateFromTitles( $pages );
        }
    }

    public function getAllowedParams() {
        return [
            'from' => null,
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'to' => null,
            'prefix' => null,
            'dir' => [
                ParamValidator::PARAM_DEFAULT => 'ascending',
                ParamValidator::PARAM_TYPE => [
                    'ascending',
                    'descending'
                ],
            ],
            'min' => [
                ParamValidator::PARAM_TYPE => 'integer'
            ],
            'max' => [
                ParamValidator::PARAM_TYPE => 'integer'
            ],
            'limit' => [
                ParamValidator::PARAM_DEFAULT => 10,
                ParamValidator::PARAM_TYPE => 'limit',
                IntegerDef::PARAM_MIN => 1,
                IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1,
                IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
            'prop' => [
                ParamValidator::PARAM_TYPE => [ 'size', 'hidden' ],
                ParamValidator::PARAM_DEFAULT => '',
                ParamValidator::PARAM_ISMULTI => true,
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&list=allcategories&acprop=size'
                => 'apihelp-query+allcategories-example-size',
            'action=query&generator=allcategories&gacprefix=List&prop=info'
                => 'apihelp-query+allcategories-example-generator',
        ];
    }

    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Allcategories';
    }
}