Merge "rest: Return a 400 for invalid render IDs"

[mediawiki.git] / includes / specialpage / ChangesListSpecialPage.php

<?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
 *
 * @file
 */

namespace MediaWiki\SpecialPage;

use ChangesListBooleanFilter;
use ChangesListBooleanFilterGroup;
use ChangesListFilterGroup;
use ChangesListStringOptionsFilterGroup;
use ChangeTags;
use MediaWiki\Context\IContextSource;
use MediaWiki\Html\FormOptions;
use MediaWiki\Html\Html;
use MediaWiki\Json\FormatJson;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Parser\Sanitizer;
use MediaWiki\ResourceLoader as RL;
use MediaWiki\User\TempUser\TempUserConfig;
use MediaWiki\User\UserArray;
use MediaWiki\User\UserIdentity;
use MediaWiki\User\UserIdentityUtils;
use MWExceptionHandler;
use OOUI\IconWidget;
use RecentChange;
use Wikimedia\Rdbms\DBQueryTimeoutError;
use Wikimedia\Rdbms\FakeResultWrapper;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\IReadableDatabase;
use Wikimedia\Rdbms\IResultWrapper;
use Wikimedia\Rdbms\RawSQLValue;
use Wikimedia\Timestamp\ConvertibleTimestamp;

/**
 * Special page which uses a ChangesList to show query results.
 *
 * @todo Most of the functions here should be protected instead of public.
 *
 * @ingroup RecentChanges
 * @ingroup SpecialPage
 */
abstract class ChangesListSpecialPage extends SpecialPage {

        /** @var string */
        protected $rcSubpage;

        /** @var FormOptions */
        protected $rcOptions;

        protected UserIdentityUtils $userIdentityUtils;
        protected TempUserConfig $tempUserConfig;

        // Order of both groups and filters is significant; first is top-most priority,
        // descending from there.
        // 'showHideSuffix' is a shortcut to and avoid spelling out
        // details specific to subclasses here.
        /**
         * Definition information for the filters and their groups
         *
         * The value is $groupDefinition, a parameter to the ChangesListFilterGroup constructor.
         * However, priority is dynamically added for the core groups, to ease maintenance.
         *
         * Groups are displayed to the user in the structured UI.  However, if necessary,
         * all of the filters in a group can be configured to only display on the
         * unstuctured UI, in which case you don't need a group title.
         *
         * @var array
         */
        private $filterGroupDefinitions;

        /**
         * @var array Same format as filterGroupDefinitions, but for a single group (reviewStatus)
         * that is registered conditionally.
         */
        private $legacyReviewStatusFilterGroupDefinition;

        /** @var array Single filter group registered conditionally */
        private $reviewStatusFilterGroupDefinition;

        /** @var array Single filter group registered conditionally */
        private $hideCategorizationFilterDefinition;

        /**
         * Filter groups, and their contained filters
         * This is an associative array (with group name as key) of ChangesListFilterGroup objects.
         *
         * @var ChangesListFilterGroup[]
         */
        protected $filterGroups = [];

        /**
         * @param string $name
         * @param string $restriction
         * @param UserIdentityUtils $userIdentityUtils
         * @param TempUserConfig $tempUserConfig
         */
        public function __construct(
                $name,
                $restriction,
                UserIdentityUtils $userIdentityUtils,
                TempUserConfig $tempUserConfig
        ) {
                parent::__construct( $name, $restriction );

                $this->userIdentityUtils = $userIdentityUtils;
                $this->tempUserConfig = $tempUserConfig;

                $nonRevisionTypes = [ RC_LOG ];
                $this->getHookRunner()->onSpecialWatchlistGetNonRevisionTypes( $nonRevisionTypes );

                $this->filterGroupDefinitions = [
                        [
                                'name' => 'registration',
                                'title' => 'rcfilters-filtergroup-registration',
                                'class' => ChangesListBooleanFilterGroup::class,
                                'filters' => [
                                        [
                                                'name' => 'hideliu',
                                                // rcshowhideliu-show, rcshowhideliu-hide,
                                                // wlshowhideliu
                                                'showHideSuffix' => 'showhideliu',
                                                'default' => false,
                                                'queryCallable' => function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $this->getRegisteredExpr( false, $dbr );
                                                        $join_conds['recentchanges_actor'] = [ 'JOIN', 'actor_id=rc_actor' ];
                                                },
                                                'isReplacedInStructuredUi' => true,

                                        ],
                                        [
                                                'name' => 'hideanons',
                                                // rcshowhideanons-show, rcshowhideanons-hide,
                                                // wlshowhideanons
                                                'showHideSuffix' => 'showhideanons',
                                                'default' => false,
                                                'queryCallable' => function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $this->getRegisteredExpr( true, $dbr );
                                                        $join_conds['recentchanges_actor'] = [ 'JOIN', 'actor_id=rc_actor' ];
                                                },
                                                'isReplacedInStructuredUi' => true,
                                        ]
                                ],
                        ],

                        [
                                'name' => 'userExpLevel',
                                'title' => 'rcfilters-filtergroup-user-experience-level',
                                'class' => ChangesListStringOptionsFilterGroup::class,
                                'isFullCoverage' => true,
                                'filters' => [
                                        [
                                                'name' => 'unregistered',
                                                'label' => 'rcfilters-filter-user-experience-level-unregistered-label',
                                                'description' => $this->tempUserConfig->isKnown() ?
                                                        'rcfilters-filter-user-experience-level-unregistered-description-temp' :
                                                        'rcfilters-filter-user-experience-level-unregistered-description',
                                                'cssClassSuffix' => 'user-unregistered',
                                                'isRowApplicableCallable' => function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return !$this->userIdentityUtils->isNamed( $rc->getPerformerIdentity() );
                                                }
                                        ],
                                        [
                                                'name' => 'registered',
                                                'label' => 'rcfilters-filter-user-experience-level-registered-label',
                                                'description' => 'rcfilters-filter-user-experience-level-registered-description',
                                                'cssClassSuffix' => 'user-registered',
                                                'isRowApplicableCallable' => function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $this->userIdentityUtils->isNamed( $rc->getPerformerIdentity() );
                                                }
                                        ],
                                        [
                                                'name' => 'newcomer',
                                                'label' => 'rcfilters-filter-user-experience-level-newcomer-label',
                                                'description' => 'rcfilters-filter-user-experience-level-newcomer-description',
                                                'cssClassSuffix' => 'user-newcomer',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        $performer = $rc->getPerformerIdentity();
                                                        return $performer->isRegistered() &&
                                                                MediaWikiServices::getInstance()
                                                                        ->getUserFactory()
                                                                        ->newFromUserIdentity( $performer )
                                                                        ->getExperienceLevel() === 'newcomer';
                                                }
                                        ],
                                        [
                                                'name' => 'learner',
                                                'label' => 'rcfilters-filter-user-experience-level-learner-label',
                                                'description' => 'rcfilters-filter-user-experience-level-learner-description',
                                                'cssClassSuffix' => 'user-learner',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        $performer = $rc->getPerformerIdentity();
                                                        return $performer->isRegistered() &&
                                                                MediaWikiServices::getInstance()
                                                                        ->getUserFactory()
                                                                        ->newFromUserIdentity( $performer )
                                                                        ->getExperienceLevel() === 'learner';
                                                },
                                        ],
                                        [
                                                'name' => 'experienced',
                                                'label' => 'rcfilters-filter-user-experience-level-experienced-label',
                                                'description' => 'rcfilters-filter-user-experience-level-experienced-description',
                                                'cssClassSuffix' => 'user-experienced',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        $performer = $rc->getPerformerIdentity();
                                                        return $performer->isRegistered() &&
                                                                MediaWikiServices::getInstance()
                                                                        ->getUserFactory()
                                                                        ->newFromUserIdentity( $performer )
                                                                        ->getExperienceLevel() === 'experienced';
                                                },
                                        ]
                                ],
                                'default' => ChangesListStringOptionsFilterGroup::NONE,
                                'queryCallable' => [ $this, 'filterOnUserExperienceLevel' ],
                        ],

                        [
                                'name' => 'authorship',
                                'title' => 'rcfilters-filtergroup-authorship',
                                'class' => ChangesListBooleanFilterGroup::class,
                                'filters' => [
                                        [
                                                'name' => 'hidemyself',
                                                'label' => 'rcfilters-filter-editsbyself-label',
                                                'description' => 'rcfilters-filter-editsbyself-description',
                                                // rcshowhidemine-show, rcshowhidemine-hide,
                                                // wlshowhidemine
                                                'showHideSuffix' => 'showhidemine',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $user = $ctx->getUser();
                                                        $conds[] = $dbr->expr( 'actor_name', '!=', $user->getName() );
                                                        $join_conds['recentchanges_actor'] = [ 'JOIN', 'actor_id=rc_actor' ];
                                                },
                                                'cssClassSuffix' => 'self',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $ctx->getUser()->equals( $rc->getPerformerIdentity() );
                                                },
                                        ],
                                        [
                                                'name' => 'hidebyothers',
                                                'label' => 'rcfilters-filter-editsbyother-label',
                                                'description' => 'rcfilters-filter-editsbyother-description',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $user = $ctx->getUser();
                                                        if ( $user->isAnon() ) {
                                                                $conds['actor_name'] = $user->getName();
                                                        } else {
                                                                $conds['actor_user'] = $user->getId();
                                                        }
                                                        $join_conds['recentchanges_actor'] = [ 'JOIN', 'actor_id=rc_actor' ];
                                                },
                                                'cssClassSuffix' => 'others',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return !$ctx->getUser()->equals( $rc->getPerformerIdentity() );
                                                },
                                        ]
                                ]
                        ],

                        [
                                'name' => 'automated',
                                'title' => 'rcfilters-filtergroup-automated',
                                'class' => ChangesListBooleanFilterGroup::class,
                                'filters' => [
                                        [
                                                'name' => 'hidebots',
                                                'label' => 'rcfilters-filter-bots-label',
                                                'description' => 'rcfilters-filter-bots-description',
                                                // rcshowhidebots-show, rcshowhidebots-hide,
                                                // wlshowhidebots
                                                'showHideSuffix' => 'showhidebots',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds['rc_bot'] = 0;
                                                },
                                                'cssClassSuffix' => 'bot',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_bot' );
                                                },
                                        ],
                                        [
                                                'name' => 'hidehumans',
                                                'label' => 'rcfilters-filter-humans-label',
                                                'description' => 'rcfilters-filter-humans-description',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds['rc_bot'] = 1;
                                                },
                                                'cssClassSuffix' => 'human',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return !$rc->getAttribute( 'rc_bot' );
                                                },
                                        ]
                                ]
                        ],

                        // significance (conditional)

                        [
                                'name' => 'significance',
                                'title' => 'rcfilters-filtergroup-significance',
                                'class' => ChangesListBooleanFilterGroup::class,
                                'priority' => -6,
                                'filters' => [
                                        [
                                                'name' => 'hideminor',
                                                'label' => 'rcfilters-filter-minor-label',
                                                'description' => 'rcfilters-filter-minor-description',
                                                // rcshowhideminor-show, rcshowhideminor-hide,
                                                // wlshowhideminor
                                                'showHideSuffix' => 'showhideminor',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $dbr->expr( 'rc_minor', '=', 0 );
                                                },
                                                'cssClassSuffix' => 'minor',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_minor' );
                                                }
                                        ],
                                        [
                                                'name' => 'hidemajor',
                                                'label' => 'rcfilters-filter-major-label',
                                                'description' => 'rcfilters-filter-major-description',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $dbr->expr( 'rc_minor', '=', 1 );
                                                },
                                                'cssClassSuffix' => 'major',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return !$rc->getAttribute( 'rc_minor' );
                                                }
                                        ]
                                ]
                        ],

                        [
                                'name' => 'lastRevision',
                                'title' => 'rcfilters-filtergroup-lastrevision',
                                'class' => ChangesListBooleanFilterGroup::class,
                                'priority' => -7,
                                'filters' => [
                                        [
                                                'name' => 'hidelastrevision',
                                                'label' => 'rcfilters-filter-lastrevision-label',
                                                'description' => 'rcfilters-filter-lastrevision-description',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) use ( $nonRevisionTypes ) {
                                                        $conds[] = $dbr->expr( 'rc_this_oldid', '!=', new RawSQLValue( 'page_latest' ) )
                                                                ->or( 'rc_type', '=', $nonRevisionTypes );
                                                },
                                                'cssClassSuffix' => 'last',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_this_oldid' ) === $rc->getAttribute( 'page_latest' );
                                                }
                                        ],
                                        [
                                                'name' => 'hidepreviousrevisions',
                                                'label' => 'rcfilters-filter-previousrevision-label',
                                                'description' => 'rcfilters-filter-previousrevision-description',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) use ( $nonRevisionTypes ) {
                                                        $conds[] = $dbr->expr( 'rc_this_oldid', '=', new RawSQLValue( 'page_latest' ) )
                                                                ->or( 'rc_type', '=', $nonRevisionTypes );
                                                },
                                                'cssClassSuffix' => 'previous',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_this_oldid' ) !== $rc->getAttribute( 'page_latest' );
                                                }
                                        ]
                                ]
                        ],

                        // With extensions, there can be change types that will not be hidden by any of these.
                        [
                                'name' => 'changeType',
                                'title' => 'rcfilters-filtergroup-changetype',
                                'class' => ChangesListBooleanFilterGroup::class,
                                'priority' => -8,
                                'filters' => [
                                        [
                                                'name' => 'hidepageedits',
                                                'label' => 'rcfilters-filter-pageedits-label',
                                                'description' => 'rcfilters-filter-pageedits-description',
                                                'default' => false,
                                                'priority' => -2,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $dbr->expr( 'rc_type', '!=', RC_EDIT );
                                                },
                                                'cssClassSuffix' => 'src-mw-edit',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_EDIT;
                                                },
                                        ],
                                        [
                                                'name' => 'hidenewpages',
                                                'label' => 'rcfilters-filter-newpages-label',
                                                'description' => 'rcfilters-filter-newpages-description',
                                                'default' => false,
                                                'priority' => -3,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $dbr->expr( 'rc_type', '!=', RC_NEW );
                                                },
                                                'cssClassSuffix' => 'src-mw-new',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_NEW;
                                                },
                                        ],

                                        // hidecategorization

                                        [
                                                'name' => 'hidelog',
                                                'label' => 'rcfilters-filter-logactions-label',
                                                'description' => 'rcfilters-filter-logactions-description',
                                                'default' => false,
                                                'priority' => -5,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $dbr->expr( 'rc_type', '!=', RC_LOG );
                                                },
                                                'cssClassSuffix' => 'src-mw-log',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_LOG;
                                                }
                                        ],
                                        [
                                                'name' => 'hidenewuserlog',
                                                'label' => 'rcfilters-filter-accountcreations-label',
                                                'description' => 'rcfilters-filter-accountcreations-description',
                                                'default' => false,
                                                'priority' => -6,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $dbr->expr( 'rc_log_type', '!=', 'newusers' )
                                                                ->or( 'rc_log_type', '=', null );
                                                },
                                                'cssClassSuffix' => 'src-mw-newuserlog',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_log_type' ) === "newusers";
                                                },
                                        ],
                                ],
                        ],

                ];

                $this->legacyReviewStatusFilterGroupDefinition = [
                        [
                                'name' => 'legacyReviewStatus',
                                'title' => 'rcfilters-filtergroup-reviewstatus',
                                'class' => ChangesListBooleanFilterGroup::class,
                                'filters' => [
                                        [
                                                'name' => 'hidepatrolled',
                                                // rcshowhidepatr-show, rcshowhidepatr-hide
                                                // wlshowhidepatr
                                                'showHideSuffix' => 'showhidepatr',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds['rc_patrolled'] = RecentChange::PRC_UNPATROLLED;
                                                },
                                                'isReplacedInStructuredUi' => true,
                                        ],
                                        [
                                                'name' => 'hideunpatrolled',
                                                'default' => false,
                                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                                                ) {
                                                        $conds[] = $dbr->expr( 'rc_patrolled', '!=', RecentChange::PRC_UNPATROLLED );
                                                },
                                                'isReplacedInStructuredUi' => true,
                                        ],
                                ],
                        ]
                ];

                $this->reviewStatusFilterGroupDefinition = [
                        [
                                'name' => 'reviewStatus',
                                'title' => 'rcfilters-filtergroup-reviewstatus',
                                'class' => ChangesListStringOptionsFilterGroup::class,
                                'isFullCoverage' => true,
                                'priority' => -5,
                                'filters' => [
                                        [
                                                'name' => 'unpatrolled',
                                                'label' => 'rcfilters-filter-reviewstatus-unpatrolled-label',
                                                'description' => 'rcfilters-filter-reviewstatus-unpatrolled-description',
                                                'cssClassSuffix' => 'reviewstatus-unpatrolled',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_patrolled' ) == RecentChange::PRC_UNPATROLLED;
                                                },
                                        ],
                                        [
                                                'name' => 'manual',
                                                'label' => 'rcfilters-filter-reviewstatus-manual-label',
                                                'description' => 'rcfilters-filter-reviewstatus-manual-description',
                                                'cssClassSuffix' => 'reviewstatus-manual',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_patrolled' ) == RecentChange::PRC_PATROLLED;
                                                },
                                        ],
                                        [
                                                'name' => 'auto',
                                                'label' => 'rcfilters-filter-reviewstatus-auto-label',
                                                'description' => 'rcfilters-filter-reviewstatus-auto-description',
                                                'cssClassSuffix' => 'reviewstatus-auto',
                                                'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                                        return $rc->getAttribute( 'rc_patrolled' ) == RecentChange::PRC_AUTOPATROLLED;
                                                },
                                        ],
                                ],
                                'default' => ChangesListStringOptionsFilterGroup::NONE,
                                'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                        IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds, $selected
                                ) {
                                        if ( $selected === [] ) {
                                                return;
                                        }
                                        $rcPatrolledValues = [
                                                'unpatrolled' => RecentChange::PRC_UNPATROLLED,
                                                'manual' => RecentChange::PRC_PATROLLED,
                                                'auto' => RecentChange::PRC_AUTOPATROLLED,
                                        ];
                                        // e.g. rc_patrolled IN (0, 2)
                                        $conds['rc_patrolled'] = array_map( static function ( $s ) use ( $rcPatrolledValues ) {
                                                return $rcPatrolledValues[ $s ];
                                        }, $selected );
                                }
                        ]
                ];

                $this->hideCategorizationFilterDefinition = [
                        'name' => 'hidecategorization',
                        'label' => 'rcfilters-filter-categorization-label',
                        'description' => 'rcfilters-filter-categorization-description',
                        // rcshowhidecategorization-show, rcshowhidecategorization-hide.
                        // wlshowhidecategorization
                        'showHideSuffix' => 'showhidecategorization',
                        'default' => false,
                        'priority' => -4,
                        'queryCallable' => static function ( string $specialClassName, IContextSource $ctx,
                                IReadableDatabase $dbr, &$tables, &$fields, &$conds, &$query_options, &$join_conds
                        ) {
                                $conds[] = $dbr->expr( 'rc_type', '!=', RC_CATEGORIZE );
                        },
                        'cssClassSuffix' => 'src-mw-categorize',
                        'isRowApplicableCallable' => static function ( IContextSource $ctx, RecentChange $rc ) {
                                return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_CATEGORIZE;
                        },
                ];
        }

        /**
         * Removes registration filters from filterGroupDefinitions
         */
        private function removeRegistrationFilterDefinitions(): void {
                foreach ( $this->filterGroupDefinitions as $key => $value ) {
                        if ( $value['name'] == "userExpLevel" ) {
                                $this->filterGroupDefinitions[ $key ][ 'filters' ] = array_filter(
                                        $this->filterGroupDefinitions[ $key ][ 'filters' ],
                                        static fn ( $val, $key ) => $val[ 'name' ] != 'registered'
                                                && $val[ 'name' ] != 'unregistered', ARRAY_FILTER_USE_BOTH );
                        }
                }
        }

        /**
         * Check if filters are in conflict and guaranteed to return no results.
         *
         * @return bool
         */
        protected function areFiltersInConflict() {
                $opts = $this->getOptions();
                foreach ( $this->getFilterGroups() as $group ) {
                        if ( $group->getConflictingGroups() ) {
                                wfLogWarning(
                                        $group->getName() .
                                        " specifies conflicts with other groups but these are not supported yet."
                                );
                        }

                        foreach ( $group->getConflictingFilters() as $conflictingFilter ) {
                                if ( $conflictingFilter->activelyInConflictWithGroup( $group, $opts ) ) {
                                        return true;
                                }
                        }

                        foreach ( $group->getFilters() as $filter ) {
                                foreach ( $filter->getConflictingFilters() as $conflictingFilter ) {
                                        if (
                                                $conflictingFilter->activelyInConflictWithFilter( $filter, $opts ) &&
                                                $filter->activelyInConflictWithFilter( $conflictingFilter, $opts )
                                        ) {
                                                return true;
                                        }
                                }

                        }

                }

                return false;
        }

        /**
         * @param string|null $subpage
         */
        public function execute( $subpage ) {
                $this->rcSubpage = $subpage;

                if ( $this->considerActionsForDefaultSavedQuery( $subpage ) ) {
                        // Don't bother rendering the page if we'll be performing a redirect (T330100).
                        return;
                }

                // Enable OOUI and module for the clock icon.
                if ( $this->getConfig()->get( MainConfigNames::WatchlistExpiry ) && !$this->including() ) {
                        $this->getOutput()->enableOOUI();
                        $this->getOutput()->addModules( 'mediawiki.special.changeslist.watchlistexpiry' );
                }

                $opts = $this->getOptions();
                try {
                        $rows = $this->getRows();
                        if ( $rows === false ) {
                                $rows = new FakeResultWrapper( [] );
                        }

                        // Used by Structured UI app to get results without MW chrome
                        if ( $this->getRequest()->getRawVal( 'action' ) === 'render' ) {
                                $this->getOutput()->setArticleBodyOnly( true );
                        }

                        // Used by "live update" and "view newest" to check
                        // if there's new changes with minimal data transfer
                        if ( $this->getRequest()->getBool( 'peek' ) ) {
                                $code = $rows->numRows() > 0 ? 200 : 204;
                                $this->getOutput()->setStatusCode( $code );

                                if ( $this->getUser()->isAnon() !==
                                        $this->getRequest()->getFuzzyBool( 'isAnon' )
                                ) {
                                        $this->getOutput()->setStatusCode( 205 );
                                }

                                return;
                        }

                        $services = MediaWikiServices::getInstance();
                        $logFormatterFactory = $services->getLogFormatterFactory();
                        $linkBatchFactory = $services->getLinkBatchFactory();
                        $batch = $linkBatchFactory->newLinkBatch();
                        $userNames = [];
                        foreach ( $rows as $row ) {
                                $batch->add( NS_USER, $row->rc_user_text );
                                $batch->add( NS_USER_TALK, $row->rc_user_text );
                                $userNames[] = $row->rc_user_text;
                                $batch->add( $row->rc_namespace, $row->rc_title );
                                if ( $row->rc_source === RecentChange::SRC_LOG ) {
                                        $formatter = $logFormatterFactory->newFromRow( $row );
                                        foreach ( $formatter->getPreloadTitles() as $title ) {
                                                $batch->addObj( $title );
                                                if ( $title->inNamespace( NS_USER ) || $title->inNamespace( NS_USER_TALK ) ) {
                                                        $userNames[] = $title->getText();
                                                }
                                        }
                                }
                        }
                        $batch->execute();
                        foreach ( UserArray::newFromNames( $userNames ) as $_ ) {
                                // Trigger UserEditTracker::setCachedUserEditCount via User::loadFromRow
                                // Preloads edit count for User::getExperienceLevel() and Linker::userToolLinks()
                        }

                        $this->setHeaders();
                        $this->outputHeader();
                        $this->addModules();
                        $this->webOutput( $rows, $opts );

                        $rows->free();
                } catch ( DBQueryTimeoutError $timeoutException ) {
                        MWExceptionHandler::logException( $timeoutException );

                        $this->setHeaders();
                        $this->outputHeader();
                        $this->addModules();

                        $this->getOutput()->setStatusCode( 500 );
                        $this->webOutputHeader( 0, $opts );
                        $this->outputTimeout();
                }

                $this->includeRcFiltersApp();
        }

        /**
         * Set the temp user config.
         *
         * @internal
         * @param TempUserConfig $tempUserConfig
         * @since 1.42
         */
        public function setTempUserConfig( TempUserConfig $tempUserConfig ) {
                $this->tempUserConfig = $tempUserConfig;
        }

        /**
         * Check whether or not the page should load defaults, and if so, whether
         * a default saved query is relevant to be redirected to. If it is relevant,
         * redirect properly with all necessary query parameters.
         *
         * @param string $subpage
         * @return bool Whether a redirect will be performed.
         */
        protected function considerActionsForDefaultSavedQuery( $subpage ) {
                if ( !$this->isStructuredFilterUiEnabled() || $this->including() ) {
                        return false;
                }

                $knownParams = $this->getRequest()->getValues(
                        ...array_keys( $this->getOptions()->getAllValues() )
                );

                // HACK: Temporarily until we can properly define "sticky" filters and parameters,
                // we need to exclude several parameters we know should not be counted towards preventing
                // the loading of defaults.
                $excludedParams = [ 'limit' => '', 'days' => '', 'enhanced' => '', 'from' => '' ];
                $knownParams = array_diff_key( $knownParams, $excludedParams );

                if (
                        // If there are NO known parameters in the URL request
                        // (that are not excluded) then we need to check into loading
                        // the default saved query
                        count( $knownParams ) === 0
                ) {
                        $prefJson = MediaWikiServices::getInstance()
                                ->getUserOptionsLookup()
                                ->getOption( $this->getUser(), $this->getSavedQueriesPreferenceName() );

                        // Get the saved queries data and parse it
                        $savedQueries = $prefJson ? FormatJson::decode( $prefJson, true ) : false;

                        if ( $savedQueries && isset( $savedQueries[ 'default' ] ) ) {
                                // Only load queries that are 'version' 2, since those
                                // have parameter representation
                                if ( isset( $savedQueries[ 'version' ] ) && $savedQueries[ 'version' ] === '2' ) {
                                        $savedQueryDefaultID = $savedQueries[ 'default' ];
                                        $defaultQuery = $savedQueries[ 'queries' ][ $savedQueryDefaultID ][ 'data' ];

                                        // Build the entire parameter list
                                        $query = array_merge(
                                                $defaultQuery[ 'params' ],
                                                $defaultQuery[ 'highlights' ],
                                                [
                                                        'urlversion' => '2',
                                                ]
                                        );
                                        // Add to the query any parameters that we may have ignored before
                                        // but are still valid and requested in the URL
                                        $query = array_merge( $this->getRequest()->getQueryValues(), $query );
                                        unset( $query[ 'title' ] );
                                        $this->getOutput()->redirect( $this->getPageTitle( $subpage )->getCanonicalURL( $query ) );

                                        // Signal that we only need to redirect to the full URL
                                        // and can skip rendering the actual page (T330100).
                                        return true;
                                } else {
                                        // There's a default, but the version is not 2, and the server can't
                                        // actually recognize the query itself. This happens if it is before
                                        // the conversion, so we need to tell the UI to reload saved query as
                                        // it does the conversion to version 2
                                        $this->getOutput()->addJsConfigVars(
                                                'wgStructuredChangeFiltersDefaultSavedQueryExists',
                                                true
                                        );

                                        // Add the class that tells the frontend it is still loading
                                        // another query
                                        $this->getOutput()->addBodyClasses( 'mw-rcfilters-ui-loading' );
                                }
                        }
                }

                return false;
        }

        /**
         * @see \MediaWiki\MainConfigSchema::RCLinkDays and \MediaWiki\MainConfigSchema::RCFilterByAge.
         * @return int[]
         */
        protected function getLinkDays() {
                $linkDays = $this->getConfig()->get( MainConfigNames::RCLinkDays );
                $filterByAge = $this->getConfig()->get( MainConfigNames::RCFilterByAge );
                $maxAge = $this->getConfig()->get( MainConfigNames::RCMaxAge );
                if ( $filterByAge ) {
                        // Trim it to only links which are within $wgRCMaxAge.
                        // Note that we allow one link higher than the max for things like
                        // "age 56 days" being accessible through the "60 days" link.
                        sort( $linkDays );

                        $maxAgeDays = $maxAge / ( 3600 * 24 );
                        foreach ( $linkDays as $i => $days ) {
                                if ( $days >= $maxAgeDays ) {
                                        array_splice( $linkDays, $i + 1 );
                                        break;
                                }
                        }
                }

                return $linkDays;
        }

        /**
         * Include the modules and configuration for the RCFilters app.
         * Conditional on the user having the feature enabled.
         *
         * If it is disabled, add a <body> class marking that
         */
        protected function includeRcFiltersApp() {
                $out = $this->getOutput();
                if ( $this->isStructuredFilterUiEnabled() && !$this->including() ) {
                        $jsData = $this->getStructuredFilterJsData();
                        $messages = [];
                        foreach ( $jsData['messageKeys'] as $key ) {
                                $messages[$key] = $this->msg( $key )->plain();
                        }

                        $out->addBodyClasses( 'mw-rcfilters-enabled' );
                        $collapsed = MediaWikiServices::getInstance()->getUserOptionsLookup()
                                ->getBoolOption( $this->getUser(), $this->getCollapsedPreferenceName() );
                        if ( $collapsed ) {
                                $out->addBodyClasses( 'mw-rcfilters-collapsed' );
                        }

                        // These config and message exports should be moved into a ResourceLoader data module (T201574)
                        $out->addJsConfigVars( 'wgStructuredChangeFilters', $jsData['groups'] );
                        $out->addJsConfigVars( 'wgStructuredChangeFiltersMessages', $messages );
                        $out->addJsConfigVars( 'wgStructuredChangeFiltersCollapsedState', $collapsed );

                        $out->addJsConfigVars(
                                'StructuredChangeFiltersDisplayConfig',
                                [
                                        'maxDays' => // Translate to days
                                                (int)$this->getConfig()->get( MainConfigNames::RCMaxAge ) / ( 24 * 3600 ),
                                        'limitArray' => $this->getConfig()->get( MainConfigNames::RCLinkLimits ),
                                        'limitDefault' => $this->getDefaultLimit(),
                                        'daysArray' => $this->getLinkDays(),
                                        'daysDefault' => $this->getDefaultDays(),
                                ]
                        );

                        $out->addJsConfigVars(
                                'wgStructuredChangeFiltersSavedQueriesPreferenceName',
                                $this->getSavedQueriesPreferenceName()
                        );
                        $out->addJsConfigVars(
                                'wgStructuredChangeFiltersLimitPreferenceName',
                                $this->getLimitPreferenceName()
                        );
                        $out->addJsConfigVars(
                                'wgStructuredChangeFiltersDaysPreferenceName',
                                $this->getDefaultDaysPreferenceName()
                        );
                        $out->addJsConfigVars(
                                'wgStructuredChangeFiltersCollapsedPreferenceName',
                                $this->getCollapsedPreferenceName()
                        );
                } else {
                        $out->addBodyClasses( 'mw-rcfilters-disabled' );
                }
        }

        /**
         * Get essential data about getRcFiltersConfigVars() for change detection.
         *
         * @internal For use by Resources.php only.
         * @see Module::getDefinitionSummary() and Module::getVersionHash()
         * @param RL\Context $context
         * @return array
         */
        public static function getRcFiltersConfigSummary( RL\Context $context ) {
                $lang = MediaWikiServices::getInstance()->getLanguageFactory()
                        ->getLanguage( $context->getLanguage() );
                return [
                        // Reduce version computation by avoiding Message parsing
                        'RCFiltersChangeTags' => ChangeTags::getChangeTagListSummary( $context, $lang ),
                        'StructuredChangeFiltersEditWatchlistUrl' =>
                                SpecialPage::getTitleFor( 'EditWatchlist' )->getLocalURL()
                ];
        }

        /**
         * Get config vars to export with the mediawiki.rcfilters.filters.ui module.
         *
         * @internal For use by Resources.php only.
         * @param RL\Context $context
         * @return array
         */
        public static function getRcFiltersConfigVars( RL\Context $context ) {
                $lang = MediaWikiServices::getInstance()->getLanguageFactory()
                        ->getLanguage( $context->getLanguage() );
                return [
                        'RCFiltersChangeTags' => ChangeTags::getChangeTagList( $context, $lang ),
                        'StructuredChangeFiltersEditWatchlistUrl' =>
                                SpecialPage::getTitleFor( 'EditWatchlist' )->getLocalURL()
                ];
        }

        /**
         * Add the "no results" message to the output
         */
        protected function outputNoResults() {
                $this->getOutput()->addHTML(
                        Html::rawElement(
                                'div',
                                [ 'class' => 'mw-changeslist-empty' ],
                                $this->msg( 'recentchanges-noresult' )->parse()
                        )
                );
        }

        /**
         * Add the "timeout" message to the output
         */
        protected function outputTimeout() {
                $this->getOutput()->addHTML(
                        '<div class="mw-changeslist-empty mw-changeslist-timeout">' .
                        $this->msg( 'recentchanges-timeout' )->parse() .
                        '</div>'
                );
        }

        /**
         * Get the database result for this special page instance. Used by ApiFeedRecentChanges.
         *
         * @return IResultWrapper|false
         */
        public function getRows() {
                $opts = $this->getOptions();

                $tables = [];
                $fields = [];
                $conds = [];
                $query_options = [];
                $join_conds = [];
                $this->buildQuery( $tables, $fields, $conds, $query_options, $join_conds, $opts );

                return $this->doMainQuery( $tables, $fields, $conds, $query_options, $join_conds, $opts );
        }

        /**
         * Get the current FormOptions for this request
         *
         * @return FormOptions
         */
        public function getOptions() {
                if ( $this->rcOptions === null ) {
                        $this->rcOptions = $this->setup( $this->rcSubpage );
                }

                return $this->rcOptions;
        }

        /**
         * Register all filters and their groups (including those from hooks), plus handle
         * conflicts and defaults.
         *
         * You might want to customize these in the same method, in subclasses.  You can
         * call getFilterGroup to access a group, and (on the group) getFilter to access a
         * filter, then make necessary modfications to the filter or group (e.g. with
         * setDefault).
         */
        protected function registerFilters() {
                $isRegistrationRequiredToEdit = !MediaWikiServices::getInstance()
                        ->getPermissionManager()
                        ->isEveryoneAllowed( "edit" );
                if ( $isRegistrationRequiredToEdit ) {
                        $this->removeRegistrationFilterDefinitions();
                }
                $this->registerFiltersFromDefinitions( $this->filterGroupDefinitions );

                // Make sure this is not being transcluded (we don't want to show this
                // information to all users just because the user that saves the edit can
                // patrol or is logged in)
                if ( !$this->including() && $this->getUser()->useRCPatrol() ) {
                        $this->registerFiltersFromDefinitions( $this->legacyReviewStatusFilterGroupDefinition );
                        $this->registerFiltersFromDefinitions( $this->reviewStatusFilterGroupDefinition );
                }

                $changeTypeGroup = $this->getFilterGroup( 'changeType' );

                $categoryFilter = null;
                if ( $this->getConfig()->get( MainConfigNames::RCWatchCategoryMembership ) ) {
                        $transformedHideCategorizationDef = $this->transformFilterDefinition(
                                $this->hideCategorizationFilterDefinition
                        );

                        $transformedHideCategorizationDef['group'] = $changeTypeGroup;

                        $categoryFilter = new ChangesListBooleanFilter(
                                $transformedHideCategorizationDef
                        );
                }

                $this->getHookRunner()->onChangesListSpecialPageStructuredFilters( $this );

                $this->registerFiltersFromDefinitions( [] );

                $userExperienceLevel = $this->getFilterGroup( 'userExpLevel' );
                if ( !$isRegistrationRequiredToEdit ) {
                        $registered = $userExperienceLevel->getFilter( 'registered' );
                        $registered->setAsSupersetOf( $userExperienceLevel->getFilter( 'newcomer' ) );
                        $registered->setAsSupersetOf( $userExperienceLevel->getFilter( 'learner' ) );
                        $registered->setAsSupersetOf( $userExperienceLevel->getFilter( 'experienced' ) );
                }

                $logactionsFilter = $changeTypeGroup->getFilter( 'hidelog' );
                $lognewuserFilter = $changeTypeGroup->getFilter( 'hidenewuserlog' );
                $pagecreationFilter = $changeTypeGroup->getFilter( 'hidenewpages' );

                $significanceTypeGroup = $this->getFilterGroup( 'significance' );
                $hideMinorFilter = $significanceTypeGroup->getFilter( 'hideminor' );

                if ( $categoryFilter !== null ) {
                        $hideMinorFilter->conflictsWith(
                                $categoryFilter,
                                'rcfilters-hideminor-conflicts-typeofchange-global',
                                'rcfilters-hideminor-conflicts-typeofchange',
                                'rcfilters-typeofchange-conflicts-hideminor'
                        );
                }
                $hideMinorFilter->conflictsWith(
                        $logactionsFilter,
                        'rcfilters-hideminor-conflicts-typeofchange-global',
                        'rcfilters-hideminor-conflicts-typeofchange',
                        'rcfilters-typeofchange-conflicts-hideminor'
                );
                $hideMinorFilter->conflictsWith(
                        $lognewuserFilter,
                        'rcfilters-hideminor-conflicts-typeofchange-global',
                        'rcfilters-hideminor-conflicts-typeofchange',
                        'rcfilters-typeofchange-conflicts-hideminor'
                );
                $hideMinorFilter->conflictsWith(
                        $pagecreationFilter,
                        'rcfilters-hideminor-conflicts-typeofchange-global',
                        'rcfilters-hideminor-conflicts-typeofchange',
                        'rcfilters-typeofchange-conflicts-hideminor'
                );
        }

        /**
         * Transforms filter definition to prepare it for constructor.
         *
         * See overrides of this method as well.
         *
         * @param array $filterDefinition Original filter definition
         *
         * @return array Transformed definition
         */
        protected function transformFilterDefinition( array $filterDefinition ) {
                return $filterDefinition;
        }

        /**
         * Register filters from a definition object
         *
         * Array specifying groups and their filters; see Filter and
         * ChangesListFilterGroup constructors.
         *
         * There is light processing to simplify core maintenance.
         * @param array $definition
         * @phan-param array<int,array{class:class-string<ChangesListFilterGroup>,filters:array}> $definition
         */
        protected function registerFiltersFromDefinitions( array $definition ) {
                $autoFillPriority = -1;
                foreach ( $definition as $groupDefinition ) {
                        if ( !isset( $groupDefinition['priority'] ) ) {
                                $groupDefinition['priority'] = $autoFillPriority;
                        } else {
                                // If it's explicitly specified, start over the auto-fill
                                $autoFillPriority = $groupDefinition['priority'];
                        }

                        $autoFillPriority--;

                        $className = $groupDefinition['class'];
                        unset( $groupDefinition['class'] );

                        foreach ( $groupDefinition['filters'] as &$filterDefinition ) {
                                $filterDefinition = $this->transformFilterDefinition( $filterDefinition );
                        }

                        $this->registerFilterGroup( new $className( $groupDefinition ) );
                }
        }

        /**
         * @return ChangesListBooleanFilter[] The legacy show/hide toggle filters
         */
        protected function getLegacyShowHideFilters() {
                $filters = [];
                foreach ( $this->filterGroups as $group ) {
                        if ( $group instanceof ChangesListBooleanFilterGroup ) {
                                foreach ( $group->getFilters() as $key => $filter ) {
                                        if ( $filter->displaysOnUnstructuredUi() ) {
                                                $filters[ $key ] = $filter;
                                        }
                                }
                        }
                }
                return $filters;
        }

        /**
         * Register all the filters, including legacy hook-driven ones.
         * Then create a FormOptions object with options as specified by the user
         *
         * @param string $parameters
         *
         * @return FormOptions
         */
        public function setup( $parameters ) {
                $this->registerFilters();

                $opts = $this->getDefaultOptions();

                $opts = $this->fetchOptionsFromRequest( $opts );

                // Give precedence to subpage syntax
                if ( $parameters !== null ) {
                        $this->parseParameters( $parameters, $opts );
                }

                $this->validateOptions( $opts );

                return $opts;
        }

        /**
         * Get a FormOptions object containing the default options. By default, returns
         * some basic options.  The filters listed explicitly here are overridden in this
         * method, in subclasses, but most filters (e.g. hideminor, userExpLevel filters,
         * and more) are structured.  Structured filters are overridden in registerFilters.
         * not here.
         *
         * @return FormOptions
         */
        public function getDefaultOptions() {
                $opts = new FormOptions();
                $structuredUI = $this->isStructuredFilterUiEnabled();
                // If urlversion=2 is set, ignore the filter defaults and set them all to false/empty
                $useDefaults = $this->getRequest()->getInt( 'urlversion' ) !== 2;

                /** @var ChangesListFilterGroup $filterGroup */
                foreach ( $this->filterGroups as $filterGroup ) {
                        $filterGroup->addOptions( $opts, $useDefaults, $structuredUI );
                }

                $opts->add( 'namespace', '', FormOptions::STRING );
                // TODO: Rename this option to 'invertnamespaces'?
                $opts->add( 'invert', false );
                $opts->add( 'associated', false );
                $opts->add( 'urlversion', 1 );
                $opts->add( 'tagfilter', '' );
                $opts->add( 'inverttags', false );

                $opts->add( 'days', $this->getDefaultDays(), FormOptions::FLOAT );
                $opts->add( 'limit', $this->getDefaultLimit(), FormOptions::INT );

                $opts->add( 'from', '' );

                return $opts;
        }

        /**
         * Register a structured changes list filter group
         */
        public function registerFilterGroup( ChangesListFilterGroup $group ) {
                $groupName = $group->getName();

                $this->filterGroups[$groupName] = $group;
        }

        /**
         * Gets the currently registered filters groups
         *
         * @return ChangesListFilterGroup[] Associative array of ChangesListFilterGroup objects, with group name as key
         */
        protected function getFilterGroups() {
                return $this->filterGroups;
        }

        /**
         * Gets a specified ChangesListFilterGroup by name
         *
         * @param string $groupName Name of group
         *
         * @return ChangesListFilterGroup|null Group, or null if not registered
         */
        public function getFilterGroup( $groupName ) {
                return $this->filterGroups[$groupName] ?? null;
        }

        // Currently, this intentionally only includes filters that display
        // in the structured UI.  This can be changed easily, though, if we want
        // to include data on filters that use the unstructured UI.  messageKeys is a
        // special top-level value, with the value being an array of the message keys to
        // send to the client.

        /**
         * Gets structured filter information needed by JS
         *
         * @return array Associative array
         * * array $return['groups'] Group data
         * * array $return['messageKeys'] Array of message keys
         */
        public function getStructuredFilterJsData() {
                $output = [
                        'groups' => [],
                        'messageKeys' => [],
                ];

                usort( $this->filterGroups, static function ( ChangesListFilterGroup $a, ChangesListFilterGroup $b ) {
                        return $b->getPriority() <=> $a->getPriority();
                } );

                foreach ( $this->filterGroups as $group ) {
                        $groupOutput = $group->getJsData();
                        if ( $groupOutput !== null ) {
                                $output['messageKeys'] = array_merge(
                                        $output['messageKeys'],
                                        $groupOutput['messageKeys']
                                );

                                unset( $groupOutput['messageKeys'] );
                                $output['groups'][] = $groupOutput;
                        }
                }

                return $output;
        }

        /**
         * Fetch values for a FormOptions object from the WebRequest associated with this instance.
         *
         * Intended for subclassing, e.g. to add a backwards-compatibility layer.
         *
         * @param FormOptions $opts
         * @return FormOptions
         */
        protected function fetchOptionsFromRequest( $opts ) {
                $opts->fetchValuesFromRequest( $this->getRequest() );

                return $opts;
        }

        /**
         * Process $par and put options found in $opts. Used when including the page.
         *
         * @param string $par
         * @param FormOptions $opts
         */
        public function parseParameters( $par, FormOptions $opts ) {
                $stringParameterNameSet = [];
                $hideParameterNameSet = [];

                // URL parameters can be per-group, like 'userExpLevel',
                // or per-filter, like 'hideminor'.

                foreach ( $this->filterGroups as $filterGroup ) {
                        if ( $filterGroup instanceof ChangesListStringOptionsFilterGroup ) {
                                $stringParameterNameSet[$filterGroup->getName()] = true;
                        } elseif ( $filterGroup instanceof ChangesListBooleanFilterGroup ) {
                                foreach ( $filterGroup->getFilters() as $filter ) {
                                        $hideParameterNameSet[$filter->getName()] = true;
                                }
                        }
                }

                $bits = preg_split( '/\s*,\s*/', trim( $par ) );
                foreach ( $bits as $bit ) {
                        $m = [];
                        if ( isset( $hideParameterNameSet[$bit] ) ) {
                                // hidefoo => hidefoo=true
                                $opts[$bit] = true;
                        } elseif ( isset( $hideParameterNameSet["hide$bit"] ) ) {
                                // foo => hidefoo=false
                                $opts["hide$bit"] = false;
                        } elseif ( preg_match( '/^(.*)=(.*)$/', $bit, $m ) ) {
                                if ( isset( $stringParameterNameSet[$m[1]] ) ) {
                                        $opts[$m[1]] = $m[2];
                                }
                        }
                }
        }

        /**
         * Validate a FormOptions object generated by getDefaultOptions() with values already populated.
         */
        public function validateOptions( FormOptions $opts ) {
                $isContradictory = $this->fixContradictoryOptions( $opts );
                $isReplaced = $this->replaceOldOptions( $opts );

                if ( $isContradictory || $isReplaced ) {
                        $query = wfArrayToCgi( $this->convertParamsForLink( $opts->getChangedValues() ) );
                        $this->getOutput()->redirect( $this->getPageTitle()->getCanonicalURL( $query ) );
                }

                $opts->validateIntBounds( 'limit', 0, 5000 );
                $opts->validateBounds( 'days', 0,
                        $this->getConfig()->get( MainConfigNames::RCMaxAge ) / ( 3600 * 24 ) );
        }

        /**
         * Fix invalid options by resetting pairs that should never appear together.
         *
         * @param FormOptions $opts
         * @return bool True if any option was reset
         */
        private function fixContradictoryOptions( FormOptions $opts ) {
                $fixed = $this->fixBackwardsCompatibilityOptions( $opts );

                foreach ( $this->filterGroups as $filterGroup ) {
                        if ( $filterGroup instanceof ChangesListBooleanFilterGroup ) {
                                $filters = $filterGroup->getFilters();

                                if ( count( $filters ) === 1 ) {
                                        // legacy boolean filters should not be considered
                                        continue;
                                }

                                $allInGroupEnabled = array_reduce(
                                        $filters,
                                        static function ( bool $carry, ChangesListBooleanFilter $filter ) use ( $opts ) {
                                                return $carry && $opts[ $filter->getName() ];
                                        },
                                        /* initialValue */ count( $filters ) > 0
                                );

                                if ( $allInGroupEnabled ) {
                                        foreach ( $filters as $filter ) {
                                                $opts[ $filter->getName() ] = false;
                                        }

                                        $fixed = true;
                                }
                        }
                }

                return $fixed;
        }

        /**
         * Fix a special case (hideanons=1 and hideliu=1) in a special way, for backwards
         * compatibility.
         *
         * This is deprecated and may be removed.
         *
         * @param FormOptions $opts
         * @return bool True if this change was mode
         */
        private function fixBackwardsCompatibilityOptions( FormOptions $opts ) {
                if ( $opts['hideanons'] && $opts['hideliu'] ) {
                        $opts->reset( 'hideanons' );
                        if ( !$opts['hidebots'] ) {
                                $opts->reset( 'hideliu' );
                                $opts['hidehumans'] = 1;
                        }

                        return true;
                }

                return false;
        }

        /**
         * Replace old options with their structured UI equivalents
         *
         * @param FormOptions $opts
         * @return bool True if the change was made
         */
        public function replaceOldOptions( FormOptions $opts ) {
                if ( !$this->isStructuredFilterUiEnabled() ) {
                        return false;
                }

                $changed = false;

                // At this point 'hideanons' and 'hideliu' cannot be both true,
                // because fixBackwardsCompatibilityOptions resets (at least) 'hideanons' in such case
                if ( $opts[ 'hideanons' ] ) {
                        $opts->reset( 'hideanons' );
                        $opts[ 'userExpLevel' ] = 'registered';
                        $changed = true;
                }

                if ( $opts[ 'hideliu' ] ) {
                        $opts->reset( 'hideliu' );
                        $opts[ 'userExpLevel' ] = 'unregistered';
                        $changed = true;
                }

                if ( $this->getFilterGroup( 'legacyReviewStatus' ) ) {
                        if ( $opts[ 'hidepatrolled' ] ) {
                                $opts->reset( 'hidepatrolled' );
                                $opts[ 'reviewStatus' ] = 'unpatrolled';
                                $changed = true;
                        }

                        if ( $opts[ 'hideunpatrolled' ] ) {
                                $opts->reset( 'hideunpatrolled' );
                                $opts[ 'reviewStatus' ] = implode(
                                        ChangesListStringOptionsFilterGroup::SEPARATOR,
                                        [ 'manual', 'auto' ]
                                );
                                $changed = true;
                        }
                }

                return $changed;
        }

        /**
         * Convert parameters values from true/false to 1/0
         * so they are not omitted by wfArrayToCgi()
         * T38524
         *
         * @param array $params
         * @return array
         */
        protected function convertParamsForLink( $params ) {
                foreach ( $params as &$value ) {
                        if ( $value === false ) {
                                $value = '0';
                        }
                }
                unset( $value );
                return $params;
        }

        /**
         * Sets appropriate tables, fields, conditions, etc. depending on which filters
         * the user requested.
         *
         * @param array &$tables Array of tables; see IReadableDatabase::select $table
         * @param array &$fields Array of fields; see IReadableDatabase::select $vars
         * @param array &$conds Array of conditions; see IReadableDatabase::select $conds
         * @param array &$query_options Array of query options; see IReadableDatabase::select $options
         * @param array &$join_conds Array of join conditions; see IReadableDatabase::select $join_conds
         * @param FormOptions $opts
         */
        protected function buildQuery( &$tables, &$fields, &$conds, &$query_options,
                &$join_conds, FormOptions $opts
        ) {
                $dbr = $this->getDB();
                $isStructuredUI = $this->isStructuredFilterUiEnabled();

                /** @var ChangesListFilterGroup $filterGroup */
                foreach ( $this->filterGroups as $filterGroup ) {
                        $filterGroup->modifyQuery( $dbr, $this, $tables, $fields, $conds,
                                $query_options, $join_conds, $opts, $isStructuredUI );
                }

                // Namespace filtering
                if ( $opts[ 'namespace' ] !== '' ) {
                        $namespaces = explode( ';', $opts[ 'namespace' ] );

                        $namespaces = $this->expandSymbolicNamespaceFilters( $namespaces );

                        $namespaceInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
                        $namespaces = array_filter( $namespaces, [ $namespaceInfo, 'exists' ] );

                        if ( $namespaces !== [] ) {
                                // Namespaces are just ints, use them as int when acting with the database
                                $namespaces = array_map( 'intval', $namespaces );

                                if ( $opts[ 'associated' ] ) {
                                        $associatedNamespaces = array_map(
                                                [ $namespaceInfo, 'getAssociated' ],
                                                array_filter( $namespaces, [ $namespaceInfo, 'hasTalkNamespace' ] )
                                        );
                                        $namespaces = array_unique( array_merge( $namespaces, $associatedNamespaces ) );
                                }

                                $operator = $opts[ 'invert' ] ? '!=' : '=';
                                sort( $namespaces );
                                $conds[] = $dbr->expr( 'rc_namespace', $operator, $namespaces );
                        }
                }

                // Calculate cutoff
                $cutoff_unixtime = ConvertibleTimestamp::time() - $opts['days'] * 3600 * 24;
                $cutoff = $dbr->timestamp( $cutoff_unixtime );

                $fromValid = preg_match( '/^[0-9]{14}$/', $opts['from'] );
                if ( $fromValid && $opts['from'] > wfTimestamp( TS_MW, $cutoff ) ) {
                        $cutoff = $dbr->timestamp( $opts['from'] );
                } else {
                        $opts->reset( 'from' );
                }

                $conds[] = $dbr->expr( 'rc_timestamp', '>=', $cutoff );
        }

        /**
         * Process the query
         *
         * @param array $tables Array of tables; see IReadableDatabase::select $table
         * @param array $fields Array of fields; see IReadableDatabase::select $vars
         * @param array $conds Array of conditions; see IReadableDatabase::select $conds
         * @param array $query_options Array of query options; see IReadableDatabase::select $options
         * @param array $join_conds Array of join conditions; see IReadableDatabase::select $join_conds
         * @param FormOptions $opts
         * @return bool|IResultWrapper Result or false
         */
        protected function doMainQuery( $tables, $fields, $conds,
                $query_options, $join_conds, FormOptions $opts
        ) {
                $rcQuery = RecentChange::getQueryInfo();
                $tables = array_merge( $tables, $rcQuery['tables'] );
                $fields = array_merge( $rcQuery['fields'], $fields );
                $join_conds = array_merge( $join_conds, $rcQuery['joins'] );

                MediaWikiServices::getInstance()->getChangeTagsStore()->modifyDisplayQuery(
                        $tables,
                        $fields,
                        $conds,
                        $join_conds,
                        $query_options,
                        '',
                        $opts[ 'inverttags' ]
                );

                if (
                        !$this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts )
                ) {
                        return false;
                }

                $dbr = $this->getDB();

                return $dbr->newSelectQueryBuilder()
                        ->tables( $tables )
                        ->fields( $fields )
                        ->conds( $conds )
                        ->caller( __METHOD__ )
                        ->options( $query_options )
                        ->joinConds( $join_conds )
                        ->fetchResultSet();
        }

        protected function runMainQueryHook( &$tables, &$fields, &$conds,
                &$query_options, &$join_conds, $opts
        ) {
                return $this->getHookRunner()->onChangesListSpecialPageQuery(
                        $this->getName(), $tables, $fields, $conds, $query_options, $join_conds, $opts );
        }

        /**
         * Which database to use for read queries
         */
        protected function getDB(): IReadableDatabase {
                return MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase();
        }

        /**
         * Send header output to the OutputPage object, only called if not using feeds
         *
         * @param int $rowCount Number of database rows
         * @param FormOptions $opts
         */
        private function webOutputHeader( $rowCount, $opts ) {
                if ( !$this->including() ) {
                        $this->outputFeedLinks();
                        $this->doHeader( $opts, $rowCount );
                }
        }

        /**
         * Send output to the OutputPage object, only called if not used feeds
         *
         * @param IResultWrapper $rows Database rows
         * @param FormOptions $opts
         */
        public function webOutput( $rows, $opts ) {
                $this->webOutputHeader( $rows->numRows(), $opts );

                $this->outputChangesList( $rows, $opts );
        }

        public function outputFeedLinks() {
                // nothing by default
        }

        /**
         * Build and output the actual changes list.
         *
         * @param IResultWrapper $rows Database rows
         * @param FormOptions $opts
         */
        abstract public function outputChangesList( $rows, $opts );

        /**
         * Set the text to be displayed above the changes
         *
         * @param FormOptions $opts
         * @param int $numRows Number of rows in the result to show after this header
         */
        public function doHeader( $opts, $numRows ) {
                $this->setTopText( $opts );

                // @todo Lots of stuff should be done here.

                $this->setBottomText( $opts );
        }

        /**
         * Send the text to be displayed before the options.
         * Should use $this->getOutput()->addWikiTextAsInterface()
         * or similar methods to print the text.
         */
        public function setTopText( FormOptions $opts ) {
                // nothing by default
        }

        /**
         * Send the text to be displayed after the options.
         * Should use $this->getOutput()->addWikiTextAsInterface()
         * or similar methods to print the text.
         */
        public function setBottomText( FormOptions $opts ) {
                // nothing by default
        }

        /**
         * Get options to be displayed in a form
         * @todo This should handle options returned by getDefaultOptions().
         * @todo Not called by anything in this class (but is in subclasses), should be
         * called by something… doHeader() maybe?
         *
         * @param FormOptions $opts
         * @return array
         */
        public function getExtraOptions( $opts ) {
                return [];
        }

        /**
         * Return the legend displayed within the fieldset
         *
         * @return string
         */
        public function makeLegend() {
                $context = $this->getContext();
                $user = $context->getUser();
                # The legend showing what the letters and stuff mean
                $legend = Html::openElement( 'dl' ) . "\n";
                # Iterates through them and gets the messages for both letter and tooltip
                $legendItems = $context->getConfig()->get( MainConfigNames::RecentChangesFlags );
                if ( !( $user->useRCPatrol() || $user->useNPPatrol() ) ) {
                        unset( $legendItems['unpatrolled'] );
                }
                foreach ( $legendItems as $key => $item ) { # generate items of the legend
                        $label = $item['legend'] ?? $item['title'];
                        $letter = $item['letter'];
                        $cssClass = $item['class'] ?? $key;

                        $legend .= Html::element( 'dt',
                                [ 'class' => $cssClass ], $context->msg( $letter )->text()
                        ) . "\n" .
                        Html::rawElement( 'dd',
                                [ 'class' => Sanitizer::escapeClass( 'mw-changeslist-legend-' . $key ) ],
                                $context->msg( $label )->parse()
                        ) . "\n";
                }
                # (+-123)
                $legend .= Html::rawElement( 'dt',
                        [ 'class' => 'mw-plusminus-pos' ],
                        $context->msg( 'recentchanges-legend-plusminus' )->parse()
                ) . "\n";
                $legend .= Html::element(
                        'dd',
                        [ 'class' => 'mw-changeslist-legend-plusminus' ],
                        $context->msg( 'recentchanges-label-plusminus' )->text()
                ) . "\n";
                // Watchlist expiry clock icon.
                if ( $context->getConfig()->get( MainConfigNames::WatchlistExpiry ) && !$this->including() ) {
                        $widget = new IconWidget( [
                                'icon' => 'clock',
                                'classes' => [ 'mw-changesList-watchlistExpiry' ],
                        ] );
                        // Link the image to its label for assistive technologies.
                        $watchlistLabelId = 'mw-changeslist-watchlistExpiry-label';
                        $widget->getIconElement()->setAttributes( [
                                'role' => 'img',
                                'aria-labelledby' => $watchlistLabelId,
                        ] );
                        $legend .= Html::rawElement(
                                'dt',
                                [ 'class' => 'mw-changeslist-legend-watchlistexpiry' ],
                                $widget
                        );
                        $legend .= Html::element(
                                'dd',
                                [ 'class' => 'mw-changeslist-legend-watchlistexpiry', 'id' => $watchlistLabelId ],
                                $context->msg( 'recentchanges-legend-watchlistexpiry' )->text()
                        );
                }
                $legend .= Html::closeElement( 'dl' ) . "\n";

                $legendHeading = $this->isStructuredFilterUiEnabled() ?
                        $context->msg( 'rcfilters-legend-heading' )->parse() :
                        $context->msg( 'recentchanges-legend-heading' )->parse();

                # Collapsible
                $collapsedState = $this->getRequest()->getCookie( 'changeslist-state' );

                $legend = Html::rawElement( 'details', [
                                'class' => 'mw-changeslist-legend',
                                'open' => $collapsedState !== 'collapsed' ? 'open' : null,
                        ],
                        Html::rawElement( 'summary', [], $legendHeading ) .
                                $legend
                );

                return $legend;
        }

        /**
         * Add page-specific modules.
         */
        protected function addModules() {
                $out = $this->getOutput();
                // Styles and behavior for the legend box (see makeLegend())
                $out->addModuleStyles( [
                        'mediawiki.interface.helpers.styles',
                        'mediawiki.special.changeslist.legend',
                        'mediawiki.special.changeslist',
                ] );
                $out->addModules( 'mediawiki.special.changeslist.legend.js' );

                if ( $this->isStructuredFilterUiEnabled() && !$this->including() ) {
                        $out->addModules( 'mediawiki.rcfilters.filters.ui' );
                        $out->addModuleStyles( 'mediawiki.rcfilters.filters.base.styles' );
                }
        }

        protected function getGroupName() {
                return 'changes';
        }

        /**
         * Return expression that is true when the user is or isn't registered.
         * @param bool $isRegistered
         * @param IReadableDatabase $dbr
         * @return IExpression
         */
        private function getRegisteredExpr( $isRegistered, $dbr ): IExpression {
                $expr = $dbr->expr( 'actor_user', $isRegistered ? '!=' : '=', null );
                if ( !$this->tempUserConfig->isKnown() ) {
                        return $expr;
                }
                if ( $isRegistered ) {
                        return $expr->andExpr( $this->tempUserConfig->getMatchCondition( $dbr,
                                'actor_name', IExpression::NOT_LIKE ) );
                } else {
                        return $expr->orExpr( $this->tempUserConfig->getMatchCondition( $dbr,
                                'actor_name', IExpression::LIKE ) );
                }
        }

        /**
         * Return expression that is true when the user has reached the given experience level.
         * @param string $level 'learner' or 'experienced'
         * @param int $now Current time as UNIX timestamp (if 0, uses actual time)
         * @param IReadableDatabase $dbr
         * @param bool $asNotCondition
         * @return IExpression
         */
        private function getExperienceExpr( $level, $now, IReadableDatabase $dbr, $asNotCondition = false ): IExpression {
                $config = $this->getConfig();

                $configSince = [
                        'learner' => $config->get( MainConfigNames::LearnerMemberSince ),
                        'experienced' => $config->get( MainConfigNames::ExperiencedUserMemberSince ),
                ][$level];
                if ( $now === 0 ) {
                        $now = ConvertibleTimestamp::time();
                }
                $secondsPerDay = 86400;
                $timeCutoff = $now - $configSince * $secondsPerDay;

                $editCutoff = [
                        'learner' => $config->get( MainConfigNames::LearnerEdits ),
                        'experienced' => $config->get( MainConfigNames::ExperiencedUserEdits ),
                ][$level];

                if ( $asNotCondition ) {
                        return $dbr->expr( 'user_editcount', '<', intval( $editCutoff ) )
                                ->or( 'user_registration', '>', $dbr->timestamp( $timeCutoff ) );
                }
                return $dbr->expr( 'user_editcount', '>=', intval( $editCutoff ) )->andExpr(
                        // Users who don't have user_registration set are very old, so we assume they're above any cutoff
                        $dbr->expr( 'user_registration', '=', null )
                                ->or( 'user_registration', '<=', $dbr->timestamp( $timeCutoff ) )
                );
        }

        /**
         * Filter on users' experience levels; this will not be called if nothing is
         * selected.
         *
         * @param string $specialPageClassName Class name of current special page
         * @param IContextSource $context Context, for e.g. user
         * @param IReadableDatabase $dbr Database, for addQuotes, makeList, and similar
         * @param array &$tables Array of tables; see IReadableDatabase::select $table
         * @param array &$fields Array of fields; see IReadableDatabase::select $vars
         * @param array &$conds Array of conditions; see IReadableDatabase::select $conds
         * @param array &$query_options Array of query options; see IReadableDatabase::select $options
         * @param array &$join_conds Array of join conditions; see IReadableDatabase::select $join_conds
         * @param array $selectedExpLevels The allowed active values, sorted
         * @param int $now Current time as UNIX timestamp (if 0, uses actual time)
         */
        public function filterOnUserExperienceLevel( $specialPageClassName, $context, $dbr,
                &$tables, &$fields, &$conds, &$query_options, &$join_conds, $selectedExpLevels, $now = 0
        ) {
                $selected = array_fill_keys( $selectedExpLevels, true );

                $isUnregistered = $this->getRegisteredExpr( false, $dbr );
                $isRegistered = $this->getRegisteredExpr( true, $dbr );
                $aboveNewcomer = $this->getExperienceExpr( 'learner', $now, $dbr );
                $notAboveNewcomer = $this->getExperienceExpr( 'learner', $now, $dbr, true );
                $aboveLearner = $this->getExperienceExpr( 'experienced', $now, $dbr );
                $notAboveLearner = $this->getExperienceExpr( 'experienced', $now, $dbr, true );

                // We need to select some range of user experience levels, from the following table:
                // | Unregistered |     --------- Registered ---------     |
                // |              |  Newcomers  |  Learners  | Experienced |
                // |<------------>|<----------->|<---------->|<----------->|
                // We just need to define a condition for each of the columns, figure out which are selected,
                // and then OR them together.
                $columnConds = [
                        'unregistered' => $isUnregistered,
                        'registered' => $isRegistered,
                        'newcomer' => $dbr->andExpr( [ $isRegistered, $notAboveNewcomer ] ),
                        'learner' => $dbr->andExpr( [ $isRegistered, $aboveNewcomer, $notAboveLearner ] ),
                        'experienced' => $dbr->andExpr( [ $isRegistered, $aboveLearner ] ),
                ];

                // There are some cases where we can easily optimize away some queries:
                // | Unregistered |     --------- Registered ---------     |
                // |              |  Newcomers  |  Learners  | Experienced |
                // |              |<-------------------------------------->| (1)
                // |<----------------------------------------------------->| (2)

                // (1) Selecting all of "Newcomers", "Learners" and "Experienced users" is the same as "Registered".
                if (
                        isset( $selected['registered'] ) ||
                        ( isset( $selected['newcomer'] ) && isset( $selected['learner'] ) && isset( $selected['experienced'] ) )
                ) {
                        unset( $selected['newcomer'], $selected['learner'], $selected['experienced'] );
                        $selected['registered'] = true;
                }
                // (2) Selecting "Unregistered" and "Registered" covers all users.
                if ( isset( $selected['registered'] ) && isset( $selected['unregistered'] ) ) {
                        unset( $selected['registered'], $selected['unregistered'] );
                }

                // Combine the conditions for the selected columns.
                if ( !$selected ) {
                        return;
                }
                $selectedColumnConds = array_values( array_intersect_key( $columnConds, $selected ) );
                $conds[] = $dbr->orExpr( $selectedColumnConds );

                // Add necessary tables to the queries.
                $join_conds['recentchanges_actor'] = [ 'JOIN', 'actor_id=rc_actor' ];
                if ( isset( $selected['newcomer'] ) || isset( $selected['learner'] ) || isset( $selected['experienced'] ) ) {
                        $tables[] = 'user';
                        $join_conds['user'] = [ 'LEFT JOIN', 'actor_user=user_id' ];
                }
        }

        /**
         * Check whether the structured filter UI is enabled
         *
         * @return bool
         */
        public function isStructuredFilterUiEnabled() {
                if ( $this->getRequest()->getBool( 'rcfilters' ) ) {
                        return true;
                }

                return static::checkStructuredFilterUiEnabled( $this->getUser() );
        }

        /**
         * Static method to check whether StructuredFilter UI is enabled for the given user
         *
         * @since 1.31
         * @param UserIdentity $user
         * @return bool
         */
        public static function checkStructuredFilterUiEnabled( UserIdentity $user ) {
                return !MediaWikiServices::getInstance()
                        ->getUserOptionsLookup()
                        ->getOption( $user, 'rcenhancedfilters-disable' );
        }

        /**
         * Get the default value of the number of changes to display when loading
         * the result set.
         *
         * @since 1.30
         * @return int
         */
        public function getDefaultLimit() {
                return MediaWikiServices::getInstance()
                        ->getUserOptionsLookup()
                        ->getIntOption( $this->getUser(), $this->getLimitPreferenceName() );
        }

        /**
         * Get the default value of the number of days to display when loading
         * the result set.
         * Supports fractional values, and should be cast to a float.
         *
         * @since 1.30
         * @return float
         */
        public function getDefaultDays() {
                return floatval( MediaWikiServices::getInstance()
                        ->getUserOptionsLookup()
                        ->getOption( $this->getUser(), $this->getDefaultDaysPreferenceName() ) );
        }

        /**
         * Getting the preference name for 'limit'.
         *
         * @since 1.37
         * @return string
         */
        abstract protected function getLimitPreferenceName(): string;

        /**
         * Preference name for saved queries.
         *
         * @since 1.38
         * @return string
         */
        abstract protected function getSavedQueriesPreferenceName(): string;

        /**
         * Preference name for 'days'.
         *
         * @since 1.38
         * @return string
         */
        abstract protected function getDefaultDaysPreferenceName(): string;

        /**
         * Preference name for collapsing the active filter display.
         *
         * @since 1.38
         * @return string
         */
        abstract protected function getCollapsedPreferenceName(): string;

        /**
         * @param array $namespaces
         * @return array
         */
        private function expandSymbolicNamespaceFilters( array $namespaces ) {
                $nsInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
                $symbolicFilters = [
                        'all-contents' => $nsInfo->getSubjectNamespaces(),
                        'all-discussions' => $nsInfo->getTalkNamespaces(),
                ];
                $additionalNamespaces = [];
                foreach ( $symbolicFilters as $name => $values ) {
                        if ( in_array( $name, $namespaces ) ) {
                                $additionalNamespaces = array_merge( $additionalNamespaces, $values );
                        }
                }
                $namespaces = array_diff( $namespaces, array_keys( $symbolicFilters ) );
                $namespaces = array_merge( $namespaces, $additionalNamespaces );
                return array_unique( $namespaces );
        }
}

/** @deprecated class alias since 1.41 */
class_alias( ChangesListSpecialPage::class, 'ChangesListSpecialPage' );