Title.php
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Title.php
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			<?php
			/**
			* Representation of a title within MediaWiki.
			*
			* See Title.md
			*
			* 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\Title;

			use InvalidArgumentException;
			use MediaWiki\Cache\LinkCache;
			use MediaWiki\Context\RequestContext;
			use MediaWiki\DAO\WikiAwareEntityTrait;
			use MediaWiki\Deferred\AutoCommitUpdate;
			use MediaWiki\Deferred\DeferredUpdates;
			use MediaWiki\Exception\MWException;
			use MediaWiki\HookContainer\HookRunner;
			use MediaWiki\Html\Html;
			use MediaWiki\Interwiki\InterwikiLookup;
			use MediaWiki\JobQueue\Jobs\HTMLCacheUpdateJob;
			use MediaWiki\Language\ILanguageConverter;
			use MediaWiki\Language\Language;
			use MediaWiki\Linker\LinkTarget;
			use MediaWiki\MainConfigNames;
			use MediaWiki\MediaWikiServices;
			use MediaWiki\Message\Message;
			use MediaWiki\Page\ExistingPageRecord;
			use MediaWiki\Page\PageIdentity;
			use MediaWiki\Page\PageIdentityValue;
			use MediaWiki\Page\PageReference;
			use MediaWiki\Page\PageStoreRecord;
			use MediaWiki\Page\ProperPageIdentity;
			use MediaWiki\Page\WikiPage;
			use MediaWiki\Parser\Sanitizer;
			use MediaWiki\Request\PathRouter;
			use MediaWiki\ResourceLoader\WikiModule;
			use MediaWiki\SpecialPage\SpecialPage;
			use MediaWiki\Utils\MWTimestamp;
			use MessageLocalizer;
			use RuntimeException;
			use stdClass;
			use Stringable;
			use Wikimedia\Assert\Assert;
			use Wikimedia\Assert\PreconditionException;
			use Wikimedia\MapCacheLRU\MapCacheLRU;
			use Wikimedia\Parsoid\Core\LinkTarget as ParsoidLinkTarget;
			use Wikimedia\Parsoid\Core\LinkTargetTrait;
			use Wikimedia\Rdbms\DBAccessObjectUtils;
			use Wikimedia\Rdbms\IConnectionProvider;
			use Wikimedia\Rdbms\IDatabase;
			use Wikimedia\Rdbms\IDBAccessObject;

			/**
			* Represents a title within MediaWiki.
			* Optionally may contain an interwiki designation or namespace.
			* @note This class can fetch various kinds of data from the database;
			* however, it does so inefficiently.
			* @note Consider using a TitleValue object instead. TitleValue is more lightweight
			* and does not rely on global state or the database.
			*/
			class Title implements Stringable, LinkTarget, PageIdentity {
			use WikiAwareEntityTrait;
			use LinkTargetTrait;

			/** @var MapCacheLRU\|null */
			private static $titleCache = null;

			/**
			* Cached instance of the main page title, to speed up isMainPage() checks.
			* @var Title\|null
			*/
			private static ?Title $cachedMainPage = null;

			/**
			* Title::newFromText maintains a cache to avoid expensive re-normalization of
			* commonly used titles. On a batch operation this can become a memory leak
			* if not bounded.
			*/
			private const CACHE_MAX = 1000;

			/**
			* Flag for use with factory methods like newFromLinkTarget() that have
			* a $forceClone parameter. If set, the method must return a new instance.
			* Without this flag, some factory methods may return existing instances.as
			*
			* @since 1.33
			*/
			public const NEW_CLONE = 'clone';

			/** @var string Text form (spaces not underscores) of the main part */
			private $mTextform = '';

			/** @var string URL-encoded form of the main part */
			private $mUrlform = '';

			/** @var string Main part with underscores */
			private $mDbkeyform = '';

			/** @var int Namespace index, i.e. one of the NS_xxxx constants */
			private $mNamespace = NS_MAIN;

			/** @var string Interwiki prefix */
			private $mInterwiki = '';

			/** @var bool Was this Title created from a string with a local interwiki prefix? */
			private $mLocalInterwiki = false;

			/** @var string Title fragment (i.e. the bit after the #) */
			private $mFragment = '';

			/***************************************************************************/
			// region Private member variables
			/** @name Private member variables
			* Please use the accessor functions instead.
			* @internal
			* @{
			*/

			/** @var int Article ID, fetched from the link cache on demand */
			public $mArticleID = -1;

			/** @var int\|false ID of most recent revision */
			protected $mLatestID = false;

			/**
			* @var string\|false ID of the page's content model, i.e. one of the
			* CONTENT_MODEL_XXX constants
			*/
			private $mContentModel = false;

			/**
			* @var bool If a content model was forced via setContentModel()
			* this will be true to avoid having other code paths reset it
			*/
			private $mForcedContentModel = false;

			/** @var int\|null Estimated number of revisions; null of not loaded */
			private $mEstimateRevisions;

			/**
			* Text form including namespace/interwiki, initialised on demand
			*
			* Only public to share cache with TitleFormatter
			*
			* @internal
			* @var string\|null
			*/
			public $prefixedText = null;

			/**
			* Namespace to assume when no namespace was passed to factory methods.
			* This must be NS_MAIN, as it's hardcoded in several places. See T2696.
			* Used primarily for {{transclusion}} tags.
			*/
			private const DEFAULT_NAMESPACE = NS_MAIN;

			/** @var int The page length, 0 for special pages */
			protected $mLength = -1;

			/** @var null\|bool Is the article at this title a redirect? */
			public $mRedirect = null;

			/** @var bool Whether a page has any subpages */
			private $mHasSubpages;

			/** @var array\|null The (string) language code of the page's language and content code. */
			private $mPageLanguage;

			/** @var string\|false\|null The page language code from the database, null if not saved in
			* the database or false if not loaded, yet.
			*/
			private $mDbPageLanguage = false;

			/** @var TitleValue\|null */
			private $mTitleValue = null;

			/** @var bool\|null Would deleting this page be a big deletion? */
			private $mIsBigDeletion = null;

			/** @var bool\|null Is the title known to be valid? */
			private $mIsValid = null;

			/** @var string\|null The key of this instance in the internal Title instance cache */
			private $mInstanceCacheKey = null;

			// endregion -- end of private member variables
			/** @} */
			/***************************************************************************/

			/**
			* Shorthand for getting a Language Converter for specific language
			* @param Language $language Language of converter
			* @return ILanguageConverter
			*/
			private function getLanguageConverter( $language ): ILanguageConverter {
			return MediaWikiServices::getInstance()->getLanguageConverterFactory()
			->getLanguageConverter( $language );
			}

			/**
			* Shorthand for getting a Language Converter for page's language
			*/
			private function getPageLanguageConverter(): ILanguageConverter {
			return $this->getLanguageConverter( $this->getPageLanguage() );
			}

			/**
			* Shorthand for getting a database connection provider
			*/
			private function getDbProvider(): IConnectionProvider {
			return MediaWikiServices::getInstance()->getConnectionProvider();
			}

			/**
			* B/C kludge: provide a TitleParser for use by Title.
			* Ideally, Title would have no methods that need this.
			* Avoid usage of this singleton by using TitleValue
			* and the associated services when possible.
			*
			* @return TitleFormatter
			*/
			private static function getTitleFormatter() {
			return MediaWikiServices::getInstance()->getTitleFormatter();
			}

			/**
			* B/C kludge: provide an InterwikiLookup for use by Title.
			* Ideally, Title would have no methods that need this.
			* Avoid usage of this singleton by using TitleValue
			* and the associated services when possible.
			*
			* @return InterwikiLookup
			*/
			private static function getInterwikiLookup() {
			return MediaWikiServices::getInstance()->getInterwikiLookup();
			}

			private function __construct() {
			}

			/**
			* Create a new Title from a prefixed DB key
			*
			* @param string $key The database key, which has underscores
			* instead of spaces, possibly including namespace and
			* interwiki prefixes
			* @return Title\|null Title, or null on an error
			*/
			public static function newFromDBkey( $key ) {
			$t = new self();

			try {
			$t->secureAndSplit( $key );
			return $t;
			} catch ( MalformedTitleException $ex ) {
			return null;
			}
			}

			/**
			* Returns a Title given a LinkTarget.
			* If the given LinkTarget is already a Title instance, that instance is returned,
			* unless $forceClone is "clone". If $forceClone is "clone" and the given LinkTarget
			* is already a Title instance, that instance is copied using the clone operator.
			*
			* @since 1.27
			* @param ParsoidLinkTarget $linkTarget Assumed to be safe.
			* @param string $forceClone set to NEW_CLONE to ensure a fresh instance is returned.
			* @return Title
			*/
			public static function newFromLinkTarget( ParsoidLinkTarget $linkTarget, $forceClone = '' ) {
			if ( $linkTarget instanceof Title ) {
			// Special case if it's already a Title object
			if ( $forceClone === self::NEW_CLONE ) {
			return clone $linkTarget;
			} else {
			return $linkTarget;
			}
			}
			return self::makeTitle(
			$linkTarget->getNamespace(),
			$linkTarget->getText(),
			$linkTarget->getFragment(),
			$linkTarget->getInterwiki()
			);
			}

			/**
			* Same as newFromLinkTarget(), but if passed null, returns null.
			*
			* @since 1.34
			* @param ParsoidLinkTarget\|null $linkTarget Assumed to be safe (if not null).
			* @return Title\|null
			*/
			public static function castFromLinkTarget( ?ParsoidLinkTarget $linkTarget ) {
			if ( !$linkTarget ) {
			return null;
			}
			return self::newFromLinkTarget( $linkTarget );
			}

			/**
			* Return a Title for a given PageIdentity. If $pageIdentity is a Title,
			* that Title is returned unchanged.
			*
			* @since 1.41
			* @param PageIdentity $pageIdentity
			* @return Title
			*/
			public static function newFromPageIdentity( PageIdentity $pageIdentity ): Title {
			return self::newFromPageReference( $pageIdentity );
			}

			/**
			* Same as newFromPageIdentity(), but if passed null, returns null.
			*
			* @since 1.36
			* @param PageIdentity\|null $pageIdentity
			* @return Title\|null
			*/
			public static function castFromPageIdentity( ?PageIdentity $pageIdentity ): ?Title {
			return self::castFromPageReference( $pageIdentity );
			}

			/**
			* Return a Title for a given Reference. If $pageReference is a Title,
			* that Title is returned unchanged.
			*
			* @since 1.41
			* @param PageReference $pageReference
			* @return Title
			*/
			public static function newFromPageReference( PageReference $pageReference ): Title {
			if ( $pageReference instanceof Title ) {
			return $pageReference;
			}

			$pageReference->assertWiki( self::LOCAL );
			$title = self::makeTitle( $pageReference->getNamespace(), $pageReference->getDBkey() );

			if ( $pageReference instanceof PageIdentity ) {
			$title->mArticleID = $pageReference->getId();
			}
			return $title;
			}

			/**
			* Same as newFromPageReference(), but if passed null, returns null.
			*
			* @since 1.37
			* @param PageReference\|null $pageReference
			* @return Title\|null
			*/
			public static function castFromPageReference( ?PageReference $pageReference ): ?Title {
			if ( !$pageReference ) {
			return null;
			}
			return self::newFromPageReference( $pageReference );
			}

			/**
			* Create a new Title from text, such as what one would find in a link.
			* Decodes any HTML entities in the text.
			* Titles returned by this method are guaranteed to be valid.
			* Call canExist() to check if the Title represents an editable page.
			*
			* @note The Title instance returned by this method is not guaranteed to be a fresh instance.
			* It may instead be a cached instance created previously, with references to it remaining
			* elsewhere.
			*
			* @param string\|int\|null $text The link text; spaces, prefixes, and an
			* initial ':' indicating the main namespace are accepted.
			* @param int $defaultNamespace The namespace to use if none is specified
			* by a prefix. If you want to force a specific namespace even if
			* $text might begin with a namespace prefix, use makeTitle() or
			* makeTitleSafe().
			* @return Title\|null Title or null if the Title could not be parsed because
			* it is invalid.
			*/
			public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
			// DWIM: Integers can be passed in here when page titles are used as array keys.
			if ( $text !== null && !is_string( $text ) && !is_int( $text ) ) {
			throw new InvalidArgumentException( '$text must be a string.' );
			}
			if ( $text === null \|\| $text === '' ) {
			return null;
			}

			try {
			return self::newFromTextThrow( (string)$text, (int)$defaultNamespace );
			} catch ( MalformedTitleException $ex ) {
			return null;
			}
			}

			/**
			* Like Title::newFromText(), but throws MalformedTitleException when the title is invalid,
			* rather than returning null.
			*
			* Titles returned by this method are guaranteed to be valid.
			* Call canExist() to check if the Title represents an editable page.
			*
			* @note The Title instance returned by this method is not guaranteed to be a fresh instance.
			* It may instead be a cached instance created previously, with references to it remaining
			* elsewhere.
			*
			* @see Title::newFromText
			*
			* @since 1.25
			* @param string $text Title text to check
			* @param int $defaultNamespace
			* @throws MalformedTitleException If the title is invalid.
			* @return Title
			*/
			public static function newFromTextThrow( $text, $defaultNamespace = NS_MAIN ) {
			if ( is_object( $text ) ) {
			throw new InvalidArgumentException( '$text must be a string, given an object' );
			} elseif ( $text === null ) {
			// Legacy code relies on MalformedTitleException being thrown in this case
			// TODO: fix(happens when URL with no title in it is parsed).
			throw new MalformedTitleException( 'title-invalid-empty' );
			}

			$titleCache = self::getTitleCache();

			// Wiki pages often contain multiple links to the same page.
			// Title normalization and parsing can become expensive on pages with many
			// links, so we can save a little time by caching them.
			if ( $defaultNamespace === NS_MAIN ) {
			$t = $titleCache->get( $text );
			if ( $t ) {
			return $t;
			}
			}

			// Convert things like é ā or 〗 into normalized (T16952) text
			$filteredText = Sanitizer::decodeCharReferencesAndNormalize( $text );

			$t = new Title();
			$dbKeyForm = strtr( $filteredText, ' ', '_' );

			$t->secureAndSplit( $dbKeyForm, (int)$defaultNamespace );
			if ( $defaultNamespace === NS_MAIN ) {
			$t->mInstanceCacheKey = $text;
			$titleCache->set( $text, $t );
			}
			return $t;
			}

			/**
			* Removes this instance from the internal title cache, so it can be modified in-place
			* without polluting the cache (see T281337).
			*/
			private function uncache() {
			if ( $this->mInstanceCacheKey !== null ) {
			$titleCache = self::getTitleCache();
			$titleCache->clear( $this->mInstanceCacheKey );
			$this->mInstanceCacheKey = null;
			}
			}

			/**
			* THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
			*
			* Example of wrong and broken code:
			* $title = Title::newFromURL( $request->getText( 'title' ) );
			*
			* Example of right code:
			* $title = Title::newFromText( $request->getText( 'title' ) );
			*
			* Create a new Title from URL-encoded text. Ensures that
			* the given title's length does not exceed the maximum.
			*
			* @param string $url The title, as might be taken from a URL
			* @return Title\|null The new object, or null on an error
			*/
			public static function newFromURL( $url ) {
			$t = new Title();

			# For compatibility with old buggy URLs. "+" is usually not valid in titles,
			# but some URLs used it as a space replacement and they still come
			# from some external search tools.
			if ( !str_contains( self::legalChars(), '+' ) ) {
			$url = strtr( $url, '+', ' ' );
			}

			$dbKeyForm = strtr( $url, ' ', '_' );

			try {
			$t->secureAndSplit( $dbKeyForm );
			return $t;
			} catch ( MalformedTitleException $ex ) {
			return null;
			}
			}

			/**
			* @return MapCacheLRU
			*/
			private static function getTitleCache() {
			if ( self::$titleCache === null ) {
			self::$titleCache = new MapCacheLRU( self::CACHE_MAX );
			}
			return self::$titleCache;
			}

			/**
			* Create a new Title from an article ID
			*
			* @param int $id The page_id corresponding to the Title to create
			* @param int $flags Bitfield of IDBAccessObject::READ_* constants
			* @return Title\|null The new object, or null on an error
			*/
			public static function newFromID( $id, $flags = 0 ) {
			$pageStore = MediaWikiServices::getInstance()->getPageStore();
			$dbr = DBAccessObjectUtils::getDBFromRecency(
			MediaWikiServices::getInstance()->getConnectionProvider(),
			$flags
			);
			$row = $dbr->newSelectQueryBuilder()
			->select( $pageStore->getSelectFields() )
			->from( 'page' )
			->where( [ 'page_id' => $id ] )
			->recency( $flags )
			->caller( __METHOD__ )->fetchRow();
			if ( $row !== false ) {
			$title = self::newFromRow( $row );
			} else {
			$title = null;
			}

			return $title;
			}

			/**
			* Make a Title object from a DB row
			*
			* @param stdClass $row Object database row (needs at least page_title,page_namespace)
			* @return Title
			*/
			public static function newFromRow( $row ) {
			$t = self::makeTitle( $row->page_namespace, $row->page_title );
			$t->loadFromRow( $row );
			return $t;
			}

			/**
			* Load Title object fields from a DB row.
			* If false is given, the title will be treated as non-existing.
			*
			* @param stdClass\|false $row Database row
			*/
			public function loadFromRow( $row ) {
			if ( $row ) { // page found
			if ( isset( $row->page_id ) ) {
			$this->mArticleID = (int)$row->page_id;
			}
			if ( isset( $row->page_len ) ) {
			$this->mLength = (int)$row->page_len;
			}
			if ( isset( $row->page_is_redirect ) ) {
			$this->mRedirect = (bool)$row->page_is_redirect;
			}
			if ( isset( $row->page_latest ) ) {
			$this->mLatestID = (int)$row->page_latest;
			}
			if ( isset( $row->page_content_model ) ) {
			$this->lazyFillContentModel( $row->page_content_model );
			} else {
			$this->lazyFillContentModel( false ); // lazily-load getContentModel()
			}
			if ( isset( $row->page_lang ) ) {
			$this->mDbPageLanguage = (string)$row->page_lang;
			}
			} else { // page not found
			$this->mArticleID = 0;
			$this->mLength = 0;
			$this->mRedirect = false;
			$this->mLatestID = 0;
			$this->lazyFillContentModel( false ); // lazily-load getContentModel()
			}
			}

			/**
			* Create a new Title from a namespace index and a DB key.
			*
			* It's assumed that $ns and $title are safe, for instance when
			* they came directly from the database or a special page name,
			* not from user input.
			*
			* No validation is applied. For convenience, spaces are normalized
			* to underscores, so that e.g. user_text fields can be used directly.
			*
			* @note This method may return Title objects that are "invalid"
			* according to the isValid() method. This is usually caused by
			* configuration changes: e.g. a namespace that was once defined is
			* no longer configured, or a character that was once allowed in
			* titles is now forbidden.
			*
			* @param int $ns The namespace of the article
			* @param string $title The unprefixed database key form
			* @param string $fragment The link fragment (after the "#")
			* @param string $interwiki The interwiki prefix
			* @return Title The new object
			*/
			public static function makeTitle( $ns, $title, $fragment = '', $interwiki = '' ) {
			$t = new Title();
			$t->mInterwiki = $interwiki;
			$t->mFragment = self::normalizeFragment( $fragment );
			$t->mNamespace = $ns = (int)$ns;
			$t->mDbkeyform = strtr( $title, ' ', '_' );
			$t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
			$t->mUrlform = wfUrlencode( $t->mDbkeyform );
			$t->mTextform = strtr( $title, '_', ' ' );
			return $t;
			}

			/**
			* Create a new Title from a namespace index and a DB key.
			* The parameters will be checked for validity, which is a bit slower
			* than makeTitle() but safer for user-provided data.
			*
			* The Title object returned by this method is guaranteed to be valid.
			* Call canExist() to check if the Title represents an editable page.
			*
			* @param int $ns The namespace of the article
			* @param string $title Database key form
			* @param string $fragment The link fragment (after the "#")
			* @param string $interwiki Interwiki prefix
			* @return Title\|null The new object, or null on an error
			*/
			public static function makeTitleSafe( $ns, $title, $fragment = '', $interwiki = '' ) {
			// NOTE: ideally, this would just call makeTitle() and then isValid(),
			// but presently, that means more overhead on a potential performance hotspot.

			if ( !MediaWikiServices::getInstance()->getNamespaceInfo()->exists( $ns ) ) {
			return null;
			}

			$t = new Title();
			$dbKeyForm = self::makeName( $ns, $title, $fragment, $interwiki, true );

			try {
			$t->secureAndSplit( $dbKeyForm );
			return $t;
			} catch ( MalformedTitleException $ex ) {
			return null;
			}
			}

			/**
			* Create a new Title for the Main Page
			*
			* This uses the 'mainpage' interface message, which could be specified in
			* `$wgForceUIMsgAsContentMsg`. If that is the case, then calling this method
			* will use the user language, which would involve initialising the session
			* via `RequestContext::getMain()->getLanguage()`. For session-less endpoints,
			* be sure to pass in a MessageLocalizer (such as your own RequestContext or
			* ResourceLoader Context) to prevent an error.
			*
			* @note The Title instance returned by this method is not guaranteed to be a fresh instance.
			* It may instead be a cached instance created previously, with references to it remaining
			* elsewhere.
			*
			* @param MessageLocalizer\|null $localizer An optional context to use (since 1.34)
			* @return Title
			*/
			public static function newMainPage( ?MessageLocalizer $localizer = null ) {
			static $recursionGuard = false;

			$title = null;

			if ( !$recursionGuard ) {
			$msg = $localizer ? $localizer->msg( 'mainpage' ) : wfMessage( 'mainpage' );

			$recursionGuard = true;
			$title = self::newFromText( $msg->inContentLanguage()->text() );
			$recursionGuard = false;
			}

			// Every page renders at least one link to the Main Page (e.g. sidebar).
			// Don't produce fatal errors that would make the wiki inaccessible, and hard to fix the
			// invalid message.
			//
			// Fallback scenarios:
			// * Recursion guard
			// If the message contains a bare local interwiki (T297571), then
			// Title::newFromText via TitleParser::splitTitleString can get back here.
			// * Invalid title
			// If the 'mainpage' message contains something that is invalid, Title::newFromText
			// will return null.

			return $title ?? self::makeTitle( NS_MAIN, 'Main Page' );
			}

			/**
			* Get a regex character class describing the legal characters in a link
			*
			* @return string The list of characters, not delimited
			*/
			public static function legalChars() {
			global $wgLegalTitleChars;
			return $wgLegalTitleChars;
			}

			/**
			* Utility method for converting a character sequence from bytes to Unicode.
			*
			* Primary usecase being converting $wgLegalTitleChars to a sequence usable in
			* javascript, as PHP uses UTF-8 bytes where javascript uses Unicode code units.
			*
			* @param string $byteClass
			* @return string
			*/
			public static function convertByteClassToUnicodeClass( $byteClass ) {
			$length = strlen( $byteClass );
			// Input token queue
			$x0 = $x1 = $x2 = '';
			// Decoded queue
			$d0 = $d1 = '';
			// Decoded integer codepoints
			$ord0 = $ord1 = $ord2 = 0;
			// Re-encoded queue
			$r0 = $r1 = $r2 = '';
			// Output
			$out = '';
			// Flags
			$allowUnicode = false;
			for ( $pos = 0; $pos < $length; $pos++ ) {
			// Shift the queues down
			$x2 = $x1;
			$x1 = $x0;
			$d1 = $d0;
			$ord2 = $ord1;
			$ord1 = $ord0;
			$r2 = $r1;
			$r1 = $r0;
			// Load the current input token and decoded values
			$inChar = $byteClass[$pos];
			if ( $inChar === '\\' ) {
			if ( preg_match( '/x([0-9a-fA-F]{2})/A', $byteClass, $m, 0, $pos + 1 ) ) {
			$x0 = $inChar . $m[0];
			$d0 = chr( hexdec( $m[1] ) );
			$pos += strlen( $m[0] );
			} elseif ( preg_match( '/[0-7]{3}/A', $byteClass, $m, 0, $pos + 1 ) ) {
			$x0 = $inChar . $m[0];
			$d0 = chr( octdec( $m[0] ) );
			$pos += strlen( $m[0] );
			} elseif ( $pos + 1 >= $length ) {
			$x0 = $d0 = '\\';
			} else {
			$d0 = $byteClass[$pos + 1];
			$x0 = $inChar . $d0;
			$pos++;
			}
			} else {
			$x0 = $d0 = $inChar;
			}
			$ord0 = ord( $d0 );
			// Load the current re-encoded value
			if ( $ord0 < 32 \|\| $ord0 == 0x7f ) {
			$r0 = sprintf( '\x%02x', $ord0 );
			} elseif ( $ord0 >= 0x80 ) {
			// Allow unicode if a single high-bit character appears
			$r0 = sprintf( '\x%02x', $ord0 );
			$allowUnicode = true;
			// @phan-suppress-next-line PhanParamSuspiciousOrder false positive
			} elseif ( strpos( '-\\[]^', $d0 ) !== false ) {
			$r0 = '\\' . $d0;
			} else {
			$r0 = $d0;
			}
			// Do the output
			if ( $x0 !== '' && $x1 === '-' && $x2 !== '' ) {
			// Range
			if ( $ord2 > $ord0 ) {
			// Empty range
			} elseif ( $ord0 >= 0x80 ) {
			// Unicode range
			$allowUnicode = true;
			if ( $ord2 < 0x80 ) {
			// Keep the non-unicode section of the range
			$out .= "$r2-\\x7F";
			}
			} else {
			// Normal range
			$out .= "$r2-$r0";
			}
			// Reset state to the initial value
			// @phan-suppress-next-line PhanPluginRedundantAssignmentInLoop
			$x0 = $x1 = $d0 = $d1 = $r0 = $r1 = '';
			} elseif ( $ord2 < 0x80 ) {
			// ASCII character
			$out .= $r2;
			}
			}
			// @phan-suppress-next-line PhanSuspiciousValueComparison
			if ( $ord1 < 0x80 ) {
			$out .= $r1;
			}
			if ( $ord0 < 0x80 ) {
			$out .= $r0;
			}
			if ( $allowUnicode ) {
			$out .= '\u0080-\uFFFF';
			}
			return $out;
			}

			/**
			* Make a prefixed DB key from a DB key and a namespace index
			*
			* @param int $ns Numerical representation of the namespace
			* @param string $title The DB key form the title
			* @param string $fragment The link fragment (after the "#")
			* @param string $interwiki The interwiki prefix
			* @param bool $canonicalNamespace If true, use the canonical name for
			* $ns instead of the localized version.
			* @return string The prefixed form of the title
			*/
			public static function makeName( $ns, $title, $fragment = '', $interwiki = '',
			$canonicalNamespace = false
			) {
			if ( $canonicalNamespace ) {
			$namespace = MediaWikiServices::getInstance()->getNamespaceInfo()->
			getCanonicalName( $ns );
			} else {
			$namespace = MediaWikiServices::getInstance()->getContentLanguage()->getNsText( $ns );
			}
			if ( $namespace === false ) {
			// See T165149. Awkward, but better than erroneously linking to the main namespace.
			$namespace = self::makeName( NS_SPECIAL, "Badtitle/NS$ns", '', '', $canonicalNamespace );
			}
			$name = $namespace === '' ? $title : "$namespace:$title";
			if ( strval( $interwiki ) != '' ) {
			$name = "$interwiki:$name";
			}
			if ( strval( $fragment ) != '' ) {
			$name .= '#' . $fragment;
			}
			return $name;
			}

			/**
			* Callback for usort() to do title sorts by (namespace, title)
			*
			* @param LinkTarget\|PageReference $a
			* @param LinkTarget\|PageReference $b
			*
			* @return int Result of string comparison, or namespace comparison
			*/
			public static function compare( $a, $b ) {
			return $a->getNamespace() <=> $b->getNamespace()
			?: strcmp( $a->getDBkey(), $b->getDBkey() );
			}

			/**
			* Returns true if the title is a valid link target, and that it has been
			* properly normalized. This method checks that the title is syntactically valid,
			* and that the namespace it refers to exists.
			*
			* Titles constructed using newFromText() or makeTitleSafe() are always valid.
			*
			* @note Code that wants to check whether the title can represent a page that can
			* be created and edited should use canExist() instead. Examples of valid titles
			* that cannot "exist" are Special pages, interwiki links, and on-page section links
			* that only have the fragment part set.
			*
			* @see canExist()
			*
			* @return bool
			*/
			public function isValid() {
			if ( $this->mIsValid !== null ) {
			return $this->mIsValid;
			}

			try {
			// Optimization: Avoid Title::getFullText because that involves GenderCache
			// and (unbatched) database queries. For validation, canonical namespace suffices.
			$text = self::makeName( $this->mNamespace, $this->mDbkeyform, $this->mFragment, $this->mInterwiki, true );
			$titleParser = MediaWikiServices::getInstance()->getTitleParser();

			$parts = $titleParser->splitTitleString( $text, $this->mNamespace );

			// Check that nothing changed!
			// This ensures that $text was already properly normalized.
			if ( $parts['fragment'] !== $this->mFragment
			\|\| $parts['interwiki'] !== $this->mInterwiki
			\|\| $parts['local_interwiki'] !== $this->mLocalInterwiki
			\|\| $parts['namespace'] !== $this->mNamespace
			\|\| $parts['dbkey'] !== $this->mDbkeyform
			) {
			$this->mIsValid = false;
			return $this->mIsValid;
			}
			} catch ( MalformedTitleException $ex ) {
			$this->mIsValid = false;
			return $this->mIsValid;
			}

			$this->mIsValid = true;
			return $this->mIsValid;
			}

			/**
			* Determine whether the object refers to a page within
			* this project (either this wiki or a wiki with a local
			* interwiki, see https://www.mediawiki.org/wiki/Manual:Interwiki_table#iw_local )
			*
			* @return bool True if this is an in-project interwiki link or a wikilink, false otherwise
			*/
			public function isLocal() {
			if ( $this->isExternal() ) {
			$iw = self::getInterwikiLookup()->fetch( $this->mInterwiki );
			if ( $iw ) {
			return $iw->isLocal();
			}
			}
			return true;
			}

			/**
			* Get the interwiki prefix
			*
			* Use Title::isExternal to check if a interwiki is set
			*
			* @return string Interwiki prefix
			*/
			public function getInterwiki(): string {
			return $this->mInterwiki;
			}

			/**
			* Was this a local interwiki link?
			*
			* @return bool
			*/
			public function wasLocalInterwiki() {
			return $this->mLocalInterwiki;
			}

			/**
			* Determine whether the object refers to a page within
			* this project and is transcludable.
			*
			* @return bool True if this is transcludable
			*/
			public function isTrans() {
			if ( !$this->isExternal() ) {
			return false;
			}

			return self::getInterwikiLookup()->fetch( $this->mInterwiki )->isTranscludable();
			}

			/**
			* Returns the DB name of the distant wiki which owns the object.
			*
			* @return string\|false The DB name
			*/
			public function getTransWikiID() {
			if ( !$this->isExternal() ) {
			return false;
			}

			return self::getInterwikiLookup()->fetch( $this->mInterwiki )->getWikiID();
			}

			/**
			* Get a TitleValue object representing this Title.
			*
			* @note Not all valid Titles have a corresponding valid TitleValue
			* (e.g. TitleValues cannot represent page-local links that have a
			* fragment but no title text).
			*
			* @return TitleValue\|null
			*/
			public function getTitleValue() {
			if ( $this->mTitleValue === null ) {
			try {
			$this->mTitleValue = new TitleValue(
			$this->mNamespace,
			$this->mDbkeyform,
			$this->mFragment,
			$this->mInterwiki
			);
			} catch ( InvalidArgumentException $ex ) {
			wfDebug( __METHOD__ . ': Can\'t create a TitleValue for [[' .
			$this->getPrefixedText() . ']]: ' . $ex->getMessage() );
			}
			}

			return $this->mTitleValue;
			}

			/**
			* Get the text form (spaces not underscores) of the main part
			*
			* @return string Main part of the title
			*/
			public function getText(): string {
			return $this->mTextform;
			}

			/**
			* Get the URL-encoded form of the main part
			*
			* @return string Main part of the title, URL-encoded
			*/
			public function getPartialURL() {
			return $this->mUrlform;
			}

			/**
			* Get the main part with underscores
			*
			* @return string Main part of the title, with underscores
			*/
			public function getDBkey(): string {
			return $this->mDbkeyform;
			}

			/**
			* Get the namespace index, i.e. one of the NS_xxxx constants.
			*
			* @return int Namespace index
			*/
			public function getNamespace(): int {
			return $this->mNamespace;
			}

			/**
			* @param int $flags
			*
			* @return bool Whether $flags indicates that the latest information should be
			* read from the primary database, bypassing caches.
			*/
			private function shouldReadLatest( int $flags ) {
			return ( $flags & ( IDBAccessObject::READ_LATEST ) ) > 0;
			}

			/**
			* Get the page's content model id, see the CONTENT_MODEL_XXX constants.
			*
			* @todo Deprecate this in favor of SlotRecord::getModel()
			*
			* @param int $flags A bitfield of IDBAccessObject::READ_* constants
			* @return string Content model id
			*/
			public function getContentModel( $flags = 0 ) {
			if ( $this->mForcedContentModel ) {
			if ( !$this->mContentModel ) {
			throw new RuntimeException( 'Got out of sync; an empty model is being forced' );
			}
			// Content model is locked to the currently loaded one
			return $this->mContentModel;
			}

			if ( $this->shouldReadLatest( $flags ) \|\| !$this->mContentModel ) {
			$this->lazyFillContentModel( $this->getFieldFromPageStore( 'page_content_model', $flags ) );
			}

			if ( !$this->mContentModel ) {
			$slotRoleregistry = MediaWikiServices::getInstance()->getSlotRoleRegistry();
			$mainSlotHandler = $slotRoleregistry->getRoleHandler( 'main' );
			$this->lazyFillContentModel( $mainSlotHandler->getDefaultModel( $this ) );
			}

			return $this->mContentModel;
			}

			/**
			* Convenience method for checking a title's content model name
			*
			* @param string $id The content model ID (use the CONTENT_MODEL_XXX constants).
			* @return bool True if $this->getContentModel() == $id
			*/
			public function hasContentModel( $id ) {
			return $this->getContentModel() == $id;
			}

			/**
			* Set a proposed content model for the page for permissions checking
			*
			* This does not actually change the content model of a title in the DB.
			* It only affects this particular Title instance. The content model is
			* forced to remain this value until another setContentModel() call.
			*
			* ContentHandler::canBeUsedOn() should be checked before calling this
			* if there is any doubt regarding the applicability of the content model
			*
			* @warning This must only be used if the caller controls the further use of
			* this Title object, to avoid other code unexpectedly using the new value.
			*
			* @since 1.28
			* @param string $model CONTENT_MODEL_XXX constant
			*/
			public function setContentModel( $model ) {
			if ( (string)$model === '' ) {
			throw new InvalidArgumentException( "Missing CONTENT_MODEL_* constant" );
			}

			$this->uncache();
			$this->mContentModel = $model;
			$this->mForcedContentModel = true;
			}

			/**
			* If the content model field is not frozen then update it with a retrieved value
			*
			* @param string\|bool $model CONTENT_MODEL_XXX constant or false
			*/
			private function lazyFillContentModel( $model ) {
			if ( !$this->mForcedContentModel ) {
			$this->mContentModel = ( $model === false ) ? false : (string)$model;
			}
			}

			/**
			* Get the namespace text
			*
			* @return string\|false Namespace name with underscores (not spaces), e.g. 'User_talk'
			*/
			public function getNsText() {
			if ( $this->isExternal() ) {
			// This probably shouldn't even happen, except for interwiki transclusion.
			// If possible, use the canonical name for the foreign namespace.
			if ( $this->mNamespace === NS_MAIN ) {
			// Optimisation
			return '';
			} else {
			$nsText = MediaWikiServices::getInstance()->getNamespaceInfo()->
			getCanonicalName( $this->mNamespace );
			if ( $nsText !== false ) {
			return $nsText;
			}
			}
			}

			try {
			$formatter = self::getTitleFormatter();
			return $formatter->getNamespaceName( $this->mNamespace, $this->mDbkeyform );
			} catch ( InvalidArgumentException $ex ) {
			wfDebug( __METHOD__ . ': ' . $ex->getMessage() );
			return false;
			}
			}

			/**
			* Get the namespace text of the subject (rather than talk) page
			*
			* @return string Namespace name with underscores (not spaces)
			*/
			public function getSubjectNsText() {
			$services = MediaWikiServices::getInstance();
			return $services->getContentLanguage()->
			getNsText( $services->getNamespaceInfo()->getSubject( $this->mNamespace ) );
			}

			/**
			* Get the namespace text of the talk page
			*
			* @return string Namespace name with underscores (not spaces)
			*/
			public function getTalkNsText() {
			$services = MediaWikiServices::getInstance();
			return $services->getContentLanguage()->
			getNsText( $services->getNamespaceInfo()->getTalk( $this->mNamespace ) );
			}

			/**
			* Can this title have a corresponding talk page?
			*
			* False for relative section links (with getText() === ''),
			* interwiki links (with getInterwiki() !== ''), and pages in NS_SPECIAL.
			*
			* @see NamespaceInfo::canHaveTalkPage
			* @since 1.30
			*
			* @return bool True if this title either is a talk page or can have a talk page associated.
			*/
			public function canHaveTalkPage() {
			return MediaWikiServices::getInstance()->getNamespaceInfo()->canHaveTalkPage( $this );
			}

			/**
			* Can this title represent a page in the wiki's database?
			*
			* Titles can exist as pages in the database if they are valid, and they
			* are not Special pages, interwiki links, or fragment-only links.
			*
			* @see isValid()
			*
			* @return bool true if and only if this title can be used to perform an edit.
			*/
			public function canExist(): bool {
			// NOTE: Don't use getArticleID(), we don't want to
			// trigger a database query here. This check is supposed to
			// act as an optimization, not add extra cost.
			if ( $this->mArticleID > 0 ) {
			// It exists, so it can exist.
			return true;
			}

			// NOTE: we call the relatively expensive isValid() method further down,
			// but we can bail out early if we already know the title is invalid.
			if ( $this->mIsValid === false ) {
			// It's invalid, so it can't exist.
			return false;
			}

			if ( $this->getNamespace() < NS_MAIN ) {
			// It's a special page, so it can't exist in the database.
			return false;
			}

			if ( $this->isExternal() ) {
			// If it's external, it's not local, so it can't exist.
			return false;
			}

			if ( $this->getText() === '' ) {
			// The title has no text, so it can't exist in the database.
			// It's probably an on-page section link, like "#something".
			return false;
			}

			// Double check that the title is valid.
			return $this->isValid();
			}

			/**
			* Returns true if this is a special page.
			*
			* @return bool
			*/
			public function isSpecialPage() {
			return $this->mNamespace === NS_SPECIAL;
			}

			/**
			* Returns true if this title resolves to the named special page
			*
			* @param string $name The special page name
			* @return bool
			*/
			public function isSpecial( $name ) {
			if ( $this->isSpecialPage() ) {
			[ $thisName, /* $subpage */ ] =
			MediaWikiServices::getInstance()->getSpecialPageFactory()->
			resolveAlias( $this->mDbkeyform );
			if ( $name == $thisName ) {
			return true;
			}
			}
			return false;
			}

			/**
			* If the Title refers to a special page alias which is not the local default, resolve
			* the alias, and localise the name as necessary. Otherwise, return $this
			*
			* @return Title
			*/
			public function fixSpecialName() {
			if ( $this->isSpecialPage() ) {
			$spFactory = MediaWikiServices::getInstance()->getSpecialPageFactory();
			[ $canonicalName, $par ] = $spFactory->resolveAlias( $this->mDbkeyform );
			if ( $canonicalName ) {
			$localName = $spFactory->getLocalNameFor( $canonicalName, $par );
			if ( $localName != $this->mDbkeyform ) {
			return self::makeTitle( NS_SPECIAL, $localName );
			}
			}
			}
			return $this;
			}

			/**
			* Returns true if the title is inside the specified namespace.
			*
			* @param int $ns The namespace
			* @return bool
			* @since 1.19
			*/
			public function inNamespace( int $ns ): bool {
			return MediaWikiServices::getInstance()->getNamespaceInfo()->
			equals( $this->mNamespace, $ns );
			}

			/**
			* Returns true if the title is inside one of the specified namespaces.
			*
			* @param int\|int[] ...$namespaces The namespaces to check for
			* @return bool
			* @since 1.19
			*/
			public function inNamespaces( ...$namespaces ) {
			if ( count( $namespaces ) > 0 && is_array( $namespaces[0] ) ) {
			$namespaces = $namespaces[0];
			}

			foreach ( $namespaces as $ns ) {
			if ( $this->inNamespace( $ns ) ) {
			return true;
			}
			}

			return false;
			}

			/**
			* Returns true if the title has the same subject namespace as the
			* namespace specified.
			* For example this method will take NS_USER and return true if namespace
			* is either NS_USER or NS_USER_TALK since both of them have NS_USER
			* as their subject namespace.
			*
			* This is MUCH simpler than individually testing for equivalence
			* against both NS_USER and NS_USER_TALK, and is also forward compatible.
			* @since 1.19
			* @param int $ns
			* @return bool
			*/
			public function hasSubjectNamespace( $ns ) {
			return MediaWikiServices::getInstance()->getNamespaceInfo()->
			subjectEquals( $this->mNamespace, $ns );
			}

			/**
			* Is this Title in a namespace which contains content?
			* In other words, is this a content page, for the purposes of calculating
			* statistics, etc?
			*
			* @return bool
			*/
			public function isContentPage() {
			return MediaWikiServices::getInstance()->getNamespaceInfo()->
			isContent( $this->mNamespace );
			}

			/**
			* Would anybody with sufficient privileges be able to move this page?
			* Some pages just aren't movable.
			*
			* @return bool
			*/
			public function isMovable() {
			$services = MediaWikiServices::getInstance();
			if (
			!$services->getNamespaceInfo()->
			isMovable( $this->mNamespace ) \|\| $this->isExternal()
			) {
			// Interwiki title or immovable namespace. Hooks don't get to override here
			return false;
			}

			$result = true;
			( new HookRunner( $services->getHookContainer() ) )->onTitleIsMovable( $this, $result );
			return $result;
			}

			/**
			* Is this the mainpage?
			* @see T302186
			*
			* @since 1.18
			* @return bool
			*/
			public function isMainPage() {
			self::$cachedMainPage ??= self::newMainPage();
			return $this->equals( self::$cachedMainPage );
			}

			/**
			* Is this a subpage?
			*
			* @return bool
			*/
			public function isSubpage() {
			return MediaWikiServices::getInstance()
			->getNamespaceInfo()
			->hasSubpages( $this->mNamespace )
			&& str_contains( $this->getText(), '/' );
			}

			/**
			* Is this a conversion table for the LanguageConverter?
			*
			* @return bool
			*/
			public function isConversionTable() {
			// @todo ConversionTable should become a separate content model.
			// @todo And the prefix should be localized, too!

			return $this->mNamespace === NS_MEDIAWIKI &&
			str_starts_with( $this->getText(), 'Conversiontable/' );
			}

			/**
			* Does that page contain wikitext, or it is JS, CSS or whatever?
			*
			* @return bool
			*/
			public function isWikitextPage() {
			return $this->hasContentModel( CONTENT_MODEL_WIKITEXT );
			}

			/**
			* Could this MediaWiki namespace page contain custom CSS, JSON, or JavaScript for the
			* global UI. This is generally true for pages in the MediaWiki namespace having
			* CONTENT_MODEL_CSS, CONTENT_MODEL_JSON, or CONTENT_MODEL_JAVASCRIPT.
			*
			* This method does not return true for per-user JS/JSON/CSS. Use isUserConfigPage()
			* for that!
			*
			* Note that this method should not return true for pages that contain and show
			* "inactive" CSS, JSON, or JS.
			*
			* @return bool
			* @since 1.31
			*/
			public function isSiteConfigPage() {
			return (
			$this->isSiteCssConfigPage()
			\|\| $this->isSiteJsonConfigPage()
			\|\| $this->isSiteJsConfigPage()
			);
			}

			/**
			* Is this a "config" (.css, .json, or .js) subpage of a user page?
			*
			* @return bool
			* @since 1.31
			*/
			public function isUserConfigPage() {
			return (
			$this->isUserCssConfigPage()
			\|\| $this->isUserJsonConfigPage()
			\|\| $this->isUserJsConfigPage()
			);
			}

			/**
			* Trim down a .css, .json, or .js subpage title to get the corresponding skin name
			*
			* @return string Containing skin name from .css, .json, or .js subpage title
			* @since 1.31
			*/
			public function getSkinFromConfigSubpage() {
			$text = $this->getText();
			$lastSlashPos = $this->findSubpageDivider( $text, -1 );
			if ( $lastSlashPos === false ) {
			return '';
			}

			$lastDot = strrpos( $text, '.', $lastSlashPos );
			if ( $lastDot === false ) {
			return '';
			}

			return substr( $text, $lastSlashPos + 1, $lastDot - $lastSlashPos - 1 );
			}

			/**
			* Is this a CSS "config" subpage of a user page?
			*
			* @return bool
			* @since 1.31
			*/
			public function isUserCssConfigPage() {
			return (
			$this->mNamespace === NS_USER
			&& $this->isSubpage()
			&& $this->hasContentModel( CONTENT_MODEL_CSS )
			);
			}

			/**
			* Is this a JSON "config" subpage of a user page?
			*
			* @return bool
			* @since 1.31
			*/
			public function isUserJsonConfigPage() {
			return (
			$this->mNamespace === NS_USER
			&& $this->isSubpage()
			&& $this->hasContentModel( CONTENT_MODEL_JSON )
			);
			}

			/**
			* Is this a JS "config" subpage of a user page?
			*
			* @return bool
			* @since 1.31
			*/
			public function isUserJsConfigPage() {
			return (
			$this->mNamespace === NS_USER
			&& $this->isSubpage()
			&& $this->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
			);
			}

			/**
			* Is this a sitewide CSS "config" page?
			*
			* @return bool
			* @since 1.32
			*/
			public function isSiteCssConfigPage() {
			return (
			$this->mNamespace === NS_MEDIAWIKI
			&& (
			$this->hasContentModel( CONTENT_MODEL_CSS )
			// paranoia - a MediaWiki: namespace page with mismatching extension and content
			// model is probably by mistake and might get handled incorrectly (see e.g. T112937)
			\|\| str_ends_with( $this->mDbkeyform, '.css' )
			)
			);
			}

			/**
			* Is this a sitewide JSON "config" page?
			*
			* @return bool
			* @since 1.32
			*/
			public function isSiteJsonConfigPage() {
			return (
			$this->mNamespace === NS_MEDIAWIKI
			&& (
			$this->hasContentModel( CONTENT_MODEL_JSON )
			// paranoia - a MediaWiki: namespace page with mismatching extension and content
			// model is probably by mistake and might get handled incorrectly (see e.g. T112937)
			\|\| str_ends_with( $this->mDbkeyform, '.json' )
			)
			);
			}

			/**
			* Is this a sitewide JS "config" page?
			*
			* @return bool
			* @since 1.31
			*/
			public function isSiteJsConfigPage() {
			return (
			$this->mNamespace === NS_MEDIAWIKI
			&& (
			$this->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
			// paranoia - a MediaWiki: namespace page with mismatching extension and content
			// model is probably by mistake and might get handled incorrectly (see e.g. T112937)
			\|\| str_ends_with( $this->mDbkeyform, '.js' )
			)
			);
			}

			/**
			* Is this a message which can contain raw HTML?
			*
			* @return bool
			* @since 1.32
			*/
			public function isRawHtmlMessage() {
			global $wgRawHtmlMessages;

			if ( !$this->inNamespace( NS_MEDIAWIKI ) ) {
			return false;
			}
			$message = lcfirst( $this->getRootTitle()->getDBkey() );
			return in_array( $message, $wgRawHtmlMessages, true );
			}

			/**
			* Is this a talk page of some sort?
			*
			* @return bool
			*/
			public function isTalkPage() {
			return MediaWikiServices::getInstance()->getNamespaceInfo()->
			isTalk( $this->mNamespace );
			}

			/**
			* Get a Title object associated with the talk page of this article
			*
			* @deprecated since 1.34, use getTalkPageIfDefined() or NamespaceInfo::getTalkPage()
			* with NamespaceInfo::canHaveTalkPage(). Note that the new method will
			* throw if asked for the talk page of a section-only link, or of an interwiki
			* link.
			* @return Title The object for the talk page
			* @throws MWException if $target doesn't have talk pages, e.g. because it's in NS_SPECIAL
			* or because it's a relative link, or an interwiki link.
			*/
			public function getTalkPage() {
			// NOTE: The equivalent code in NamespaceInfo is less lenient about producing invalid titles.
			// Instead of failing on invalid titles, let's just log the issue for now.
			// See the discussion on T227817.

			// Is this the same title?
			$talkNS = MediaWikiServices::getInstance()->getNamespaceInfo()->getTalk( $this->mNamespace );
			if ( $this->mNamespace == $talkNS ) {
			return $this;
			}

			$title = self::makeTitle( $talkNS, $this->mDbkeyform );

			$this->warnIfPageCannotExist( $title, __METHOD__ );

			return $title;
			// TODO: replace the above with the code below:
			// return self::castFromLinkTarget(
			// MediaWikiServices::getInstance()->getNamespaceInfo()->getTalkPage( $this ) );
			}

			/**
			* Get a Title object associated with the talk page of this article,
			* if such a talk page can exist.
			*
			* @since 1.30
			*
			* @return Title\|null The object for the talk page,
			* or null if no associated talk page can exist, according to canHaveTalkPage().
			*/
			public function getTalkPageIfDefined() {
			if ( !$this->canHaveTalkPage() ) {
			return null;
			}

			return $this->getTalkPage();
			}

			/**
			* Get a title object associated with the subject page of this
			* talk page
			*
			* @deprecated since 1.34, use NamespaceInfo::getSubjectPage
			* @return Title The object for the subject page
			*/
			public function getSubjectPage() {
			// Is this the same title?
			$subjectNS = MediaWikiServices::getInstance()->getNamespaceInfo()
			->getSubject( $this->mNamespace );
			if ( $this->mNamespace == $subjectNS ) {
			return $this;
			}
			// NOTE: The equivalent code in NamespaceInfo is less lenient about producing invalid titles.
			// Instead of failing on invalid titles, let's just log the issue for now.
			// See the discussion on T227817.
			$title = self::makeTitle( $subjectNS, $this->mDbkeyform );

			$this->warnIfPageCannotExist( $title, __METHOD__ );

			return $title;
			// TODO: replace the above with the code below:
			// return self::castFromLinkTarget(
			// MediaWikiServices::getInstance()->getNamespaceInfo()->getSubjectPage( $this ) );
			}

			/**
			* @param Title $title
			* @param string $method
			*
			* @return bool whether a warning was issued
			*/
			private function warnIfPageCannotExist( Title $title, $method ) {
			if ( $this->getText() == '' ) {
			wfLogWarning(
			$method . ': called on empty title ' . $this->getFullText() . ', returning '
			. $title->getFullText()
			);

			return true;
			}

			if ( $this->getInterwiki() !== '' ) {
			wfLogWarning(
			$method . ': called on interwiki title ' . $this->getFullText() . ', returning '
			. $title->getFullText()
			);

			return true;
			}

			return false;
			}

			/**
			* Get the other title for this page, if this is a subject page
			* get the talk page, if it is a subject page get the talk page
			*
			* @deprecated since 1.34, use NamespaceInfo::getAssociatedPage
			* @since 1.25
			* @throws MWException If the page doesn't have an other page
			* @return Title
			*/
			public function getOtherPage() {
			// NOTE: Depend on the methods in this class instead of their equivalent in NamespaceInfo,
			// until their semantics has become exactly the same.
			// See the discussion on T227817.
			if ( $this->isSpecialPage() ) {
			throw new MWException( 'Special pages cannot have other pages' );
			}
			if ( $this->isTalkPage() ) {
			return $this->getSubjectPage();
			} else {
			if ( !$this->canHaveTalkPage() ) {
			throw new MWException( "{$this->getPrefixedText()} does not have an other page" );
			}
			return $this->getTalkPage();
			}
			// TODO: replace the above with the code below:
			// return self::castFromLinkTarget(
			// MediaWikiServices::getInstance()->getNamespaceInfo()->getAssociatedPage( $this ) );
			}

			/**
			* Get the Title fragment (i.e.\ the bit after the #) in text form
			*
			* Use Title::hasFragment to check for a fragment
			*
			* @return string Title fragment
			*/
			public function getFragment(): string {
			return $this->mFragment;
			}

			/**
			* Get the fragment in URL form, including the "#" character if there is one
			*
			* @return string Fragment in URL form
			*/
			public function getFragmentForURL() {
			if ( !$this->hasFragment() ) {
			return '';
			} elseif ( $this->isExternal() ) {
			// Note: If the interwiki is unknown, it's treated as a namespace on the local wiki,
			// so we treat it like a local interwiki.
			$interwiki = self::getInterwikiLookup()->fetch( $this->mInterwiki );
			if ( $interwiki && !$interwiki->isLocal() ) {
			return '#' . Sanitizer::escapeIdForExternalInterwiki( $this->mFragment );
			}
			}

			return '#' . Sanitizer::escapeIdForLink( $this->mFragment );
			}

			/**
			* Set the fragment for this title. Removes the first character from the
			* specified fragment before setting, so it assumes you're passing it with
			* an initial "#".
			*
			* @warning This must only be used if the caller controls the further use of
			* this Title object, to avoid other code unexpectedly using the new value.
			*
			* @param string $fragment Text
			*/
			public function setFragment( $fragment ) {
			$this->uncache();
			$this->mFragment = self::normalizeFragment( $fragment );
			}

			/**
			* Creates a new Title for a different fragment of the same page.
			*
			* @since 1.27
			* @param string $fragment
			* @return Title
			*/
			public function createFragmentTarget( string $fragment ): self {
			return self::makeTitle(
			$this->mNamespace,
			$this->getText(),
			$fragment,
			$this->mInterwiki
			);
			}

			/**
			* Normalizes fragment part of the title.
			*
			* @param string $fragment
			* @return string
			*/
			private static function normalizeFragment( $fragment ) {
			if ( str_starts_with( $fragment, '#' ) ) {
			$fragment = substr( $fragment, 1 );
			}
			return strtr( $fragment, '_', ' ' );
			}

			/**
			* Prefix some arbitrary text with the namespace or interwiki prefix
			* of this object
			*
			* @param string $name The text
			* @return string The prefixed text
			*/
			private function prefix( $name ) {
			$p = '';
			if ( $this->isExternal() ) {
			$p = $this->mInterwiki . ':';
			}

			if ( $this->mNamespace != 0 ) {
			$nsText = $this->getNsText();

			if ( $nsText === false ) {
			// See T165149. Awkward, but better than erroneously linking to the main namespace.
			$nsText = MediaWikiServices::getInstance()->getContentLanguage()->
			getNsText( NS_SPECIAL ) . ":Badtitle/NS{$this->mNamespace}";
			}

			$p .= $nsText . ':';
			}
			return $p . $name;
			}

			/**
			* Get the prefixed database key form
			*
			* @return string The prefixed title, with underscores and
			* any interwiki and namespace prefixes
			*/
			public function getPrefixedDBkey() {
			$s = $this->prefix( $this->mDbkeyform );
			$s = strtr( $s, ' ', '_' );
			return $s;
			}

			/**
			* Get the prefixed title with spaces.
			* This is the form usually used for display
			*
			* @return string The prefixed title, with spaces
			*/
			public function getPrefixedText() {
			if ( $this->prefixedText === null ) {
			$s = $this->prefix( $this->mTextform );
			$s = strtr( $s, '_', ' ' );
			$this->prefixedText = $s;
			}
			return $this->prefixedText;
			}

			/**
			* Return a string representation of this title
			*
			* @return string Representation of this title
			*/
			public function __toString(): string {
			return $this->getPrefixedText();
			}

			/**
			* Get the prefixed title with spaces, plus any fragment
			* (part beginning with '#')
			*
			* @return string The prefixed title, with spaces and the fragment, including '#'
			*/
			public function getFullText() {
			$text = $this->getPrefixedText();
			if ( $this->hasFragment() ) {
			$text .= '#' . $this->mFragment;
			}
			return $text;
			}

			/**
			* Finds the first or last subpage divider (slash) in the string.
			* Any leading sequence of slashes is ignored, since it does not divide
			* two parts of the string. Considering leading slashes dividers would
			* result in empty root title or base title (T229443).
			*
			* Note that trailing slashes are considered dividers, and empty subpage
			* names are allowed.
			*
			* @param string $text
			* @param int $dir -1 for the last or +1 for the first divider.
			*
			* @return false\|int
			*/
			private function findSubpageDivider( $text, $dir ) {
			if ( $dir > 0 ) {
			// Skip leading slashes, but keep the last one when there is nothing but slashes
			$bottom = strspn( $text, '/', 0, -1 );
			$idx = strpos( $text, '/', $bottom );
			} else {
			// Any slash from the end can be a divider, as subpage names can be empty
			$idx = strrpos( $text, '/' );
			}

			// The first character can never be a divider, as that would result in an empty base
			return $idx === 0 ? false : $idx;
			}

			/**
			* Whether this Title's namespace has subpages enabled.
			* @return bool
			*/
			private function hasSubpagesEnabled() {
			return MediaWikiServices::getInstance()->getNamespaceInfo()->
			hasSubpages( $this->mNamespace );
			}

			/**
			* Get the root page name text without a namespace, i.e. the leftmost part before any slashes
			*
			* @note the return value may contain trailing whitespace and is thus
			* not safe for use with makeTitle or TitleValue.
			*
			* @par Example:
			* @code
			* Title::newFromText('User:Foo/Bar/Baz')->getRootText();
			* # returns: 'Foo'
			* @endcode
			*
			* @return string Root name
			* @since 1.20
			*/
			public function getRootText() {
			$text = $this->getText();
			if ( !$this->hasSubpagesEnabled() ) {
			return $text;
			}

			$firstSlashPos = $this->findSubpageDivider( $text, +1 );
			// Don't discard the real title if there's no subpage involved
			if ( $firstSlashPos === false ) {
			return $text;
			}

			return substr( $text, 0, $firstSlashPos );
			}

			/**
			* Get the root page name title, i.e. the leftmost part before any slashes
			*
			* @par Example:
			* @code
			* Title::newFromText('User:Foo/Bar/Baz')->getRootTitle();
			* # returns: Title{User:Foo}
			* @endcode
			*
			* @return Title
			* @since 1.20
			*/
			public function getRootTitle() {
			$title = self::makeTitleSafe( $this->mNamespace, $this->getRootText() );

			if ( !$title ) {
			if ( !$this->isValid() ) {
			// If the title wasn't valid in the first place, we can't expect
			// to successfully parse it. T290194
			return $this;
			}

			Assert::postcondition(
			$title !== null,
			'makeTitleSafe() should always return a Title for the text ' .
			'returned by getRootText().'
			);
			}

			return $title;
			}

			/**
			* Get the base page name without a namespace, i.e. the part before the subpage name
			*
			* @note the return value may contain trailing whitespace and is thus
			* not safe for use with makeTitle or TitleValue.
			*
			* @par Example:
			* @code
			* Title::newFromText('User:Foo/Bar/Baz')->getBaseText();
			* # returns: 'Foo/Bar'
			* @endcode
			*
			* @return string Base name
			*/
			public function getBaseText() {
			$text = $this->getText();
			if ( !$this->hasSubpagesEnabled() ) {
			return $text;
			}

			$lastSlashPos = $this->findSubpageDivider( $text, -1 );
			// Don't discard the real title if there's no subpage involved
			if ( $lastSlashPos === false ) {
			return $text;
			}

			return substr( $text, 0, $lastSlashPos );
			}

			/**
			* Get the base page name title, i.e. the part before the subpage name.
			*
			* @par Example:
			* @code
			* Title::newFromText('User:Foo/Bar/Baz')->getBaseTitle();
			* # returns: Title{User:Foo/Bar}
			* @endcode
			*
			* @return Title
			* @since 1.20
			*/
			public function getBaseTitle() {
			$title = self::makeTitleSafe( $this->mNamespace, $this->getBaseText() );

			if ( !$title ) {
			if ( !$this->isValid() ) {
			// If the title wasn't valid in the first place, we can't expect
			// to successfully parse it. T290194
			return $this;
			}

			Assert::postcondition(
			$title !== null,
			'makeTitleSafe() should always return a Title for the text ' .
			'returned by getBaseText().'
			);
			}

			return $title;
			}

			/**
			* Get the lowest-level subpage name, i.e. the rightmost part after any slashes
			*
			* @par Example:
			* @code
			* Title::newFromText('User:Foo/Bar/Baz')->getSubpageText();
			* # returns: "Baz"
			* @endcode
			*
			* @return string Subpage name
			*/
			public function getSubpageText() {
			$text = $this->getText();
			if ( !$this->hasSubpagesEnabled() ) {
			return $text;
			}

			$lastSlashPos = $this->findSubpageDivider( $text, -1 );
			if ( $lastSlashPos === false ) {
			// T256922 - Return the title text if no subpages
			return $text;
			}
			return substr( $text, $lastSlashPos + 1 );
			}

			/**
			* Get the title for a subpage of the current page
			*
			* @par Example:
			* @code
			* Title::newFromText('User:Foo/Bar/Baz')->getSubpage("Asdf");
			* # returns: Title{User:Foo/Bar/Baz/Asdf}
			* @endcode
			*
			* @param string $text The subpage name to add to the title
			* @return Title\|null Subpage title, or null on an error
			* @since 1.20
			*/
			public function getSubpage( $text ) {
			return self::makeTitleSafe(
			$this->mNamespace,
			$this->getText() . '/' . $text,
			'',
			$this->mInterwiki
			);
			}

			/**
			* Get a URL-encoded form of the subpage text
			*
			* @return string URL-encoded subpage name
			*/
			public function getSubpageUrlForm() {
			$text = $this->getSubpageText();
			$text = wfUrlencode( strtr( $text, ' ', '_' ) );
			return $text;
			}

			/**
			* Get a URL-encoded title (not an actual URL) including interwiki
			*
			* @return string The URL-encoded form
			*/
			public function getPrefixedURL() {
			$s = $this->prefix( $this->mDbkeyform );
			$s = wfUrlencode( strtr( $s, ' ', '_' ) );
			return $s;
			}

			/**
			* Get a real URL referring to this title, with interwiki link and
			* fragment
			*
			* @see self::getLocalURL for the arguments.
			* @see \MediaWiki\Utils\UrlUtils::expand()
			* @param string\|array $query
			* @param false $query2 deprecated since MW 1.19; ignored since MW 1.41
			* @param string\|int\|null $proto Protocol type to use in URL
			* @return string The URL
			*/
			public function getFullURL( $query = '', $query2 = false, $proto = PROTO_RELATIVE ) {
			$services = MediaWikiServices::getInstance();

			$query = is_array( $query ) ? wfArrayToCgi( $query ) : $query;

			# Hand off all the decisions on urls to getLocalURL
			$url = $this->getLocalURL( $query );

			# Expand the url to make it a full url. Note that getLocalURL has the
			# potential to output full urls for a variety of reasons, so we use
			# UrlUtils::expand() instead of simply prepending $wgServer
			$url = (string)$services->getUrlUtils()->expand( $url, $proto );

			# Finally, add the fragment.
			$url .= $this->getFragmentForURL();
			( new HookRunner( $services->getHookContainer() ) )->onGetFullURL( $this, $url, $query );
			return $url;
			}

			/**
			* Get a url appropriate for making redirects based on an untrusted url arg
			*
			* This is basically the same as getFullUrl(), but in the case of external
			* interwikis, we send the user to a landing page, to prevent possible
			* phishing attacks and the like.
			*
			* @note Uses current protocol by default, since technically relative urls
			* aren't allowed in redirects per HTTP spec, so this is not suitable for
			* places where the url gets cached, as might pollute between
			* https and non-https users.
			* @see self::getLocalURL for the arguments.
			* @param array\|string $query
			* @param string $proto Protocol type to use in URL
			* @return string A url suitable to use in an HTTP location header.
			*/
			public function getFullUrlForRedirect( $query = '', $proto = PROTO_CURRENT ) {
			$target = $this;
			if ( $this->isExternal() ) {
			$target = SpecialPage::getTitleFor(
			'GoToInterwiki',
			$this->getPrefixedDBkey()
			);
			}
			return $target->getFullURL( $query, false, $proto );
			}

			/**
			* Get a URL with no fragment or server name (relative URL) from a Title object.
			* If this page is generated with action=render, however,
			* $wgServer is prepended to make an absolute URL.
			*
			* @see self::getFullURL to always get an absolute URL.
			* @see self::getLinkURL to always get a URL that's the simplest URL that will be
			* valid to link, locally, to the current Title.
			* @see self::newFromText to produce a Title object.
			*
			* @param string\|array $query An optional query string,
			* not used for interwiki links. Can be specified as an associative array as well,
			* e.g., [ 'action' => 'edit' ] (keys and values will be URL-escaped).
			* Some query patterns will trigger various shorturl path replacements.
			*
			* @return string
			*/
			public function getLocalURL( $query = '' ) {
			global $wgArticlePath, $wgScript, $wgMainPageIsDomainRoot;

			$query = is_array( $query ) ? wfArrayToCgi( $query ) : $query;

			$services = MediaWikiServices::getInstance();
			$hookRunner = new HookRunner( $services->getHookContainer() );
			$interwiki = self::getInterwikiLookup()->fetch( $this->mInterwiki );
			if ( $interwiki ) {
			$namespace = $this->getNsText();
			if ( $namespace != '' ) {
			# Can this actually happen? Interwikis shouldn't be parsed.
			# Yes! It can in interwiki transclusion. But... it probably shouldn't.
			$namespace .= ':';
			}
			$url = $interwiki->getURL( $namespace . $this->mDbkeyform );
			$url = wfAppendQuery( $url, $query );
			} else {
			$dbkey = wfUrlencode( $this->getPrefixedDBkey() );
			if ( $query == '' ) {
			if ( $wgMainPageIsDomainRoot && $this->isMainPage() ) {
			$url = '/';
			} else {
			$url = str_replace( '$1', $dbkey, $wgArticlePath );
			}
			$hookRunner->onGetLocalURL__Article( $this, $url );
			} else {
			global $wgVariantArticlePath, $wgActionPaths;
			$url = false;
			$matches = [];

			$articlePaths = PathRouter::getActionPaths( $wgActionPaths, $wgArticlePath );

			if ( $articlePaths
			&& preg_match( '/^(.&\|)action=([^&])(&(.*)\|)$/', $query, $matches )
			) {
			$action = urldecode( $matches[2] );
			if ( isset( $articlePaths[$action] ) ) {
			$query = $matches[1];
			if ( isset( $matches[4] ) ) {
			$query .= $matches[4];
			}
			$url = str_replace( '$1', $dbkey, $articlePaths[$action] );
			if ( $query != '' ) {
			$url = wfAppendQuery( $url, $query );
			}
			}
			}

			if ( $url === false
			&& $wgVariantArticlePath
			&& preg_match( '/^variant=([^&]*)$/', $query, $matches )
			&& $this->getPageLanguage()->equals( $services->getContentLanguage() )
			&& $this->getPageLanguageConverter()->hasVariants()
			) {
			$variant = urldecode( $matches[1] );
			if ( $this->getPageLanguageConverter()->hasVariant( $variant ) ) {
			// Only do the variant replacement if the given variant is a valid
			// variant for the page's language.
			$url = str_replace( '$2', urlencode( $variant ), $wgVariantArticlePath );
			$url = str_replace( '$1', $dbkey, $url );
			}
			}

			if ( $url === false ) {
			if ( $query == '-' ) {
			$query = '';
			}
			$url = "{$wgScript}?title={$dbkey}&{$query}";
			}
			}
			$hookRunner->onGetLocalURL__Internal( $this, $url, $query );
			}

			$hookRunner->onGetLocalURL( $this, $url, $query );
			return $url;
			}

			/**
			* Get a URL that's the simplest URL that will be valid to link, locally,
			* to the current Title. It includes the fragment, but does not include
			* the server unless action=render is used (or the link is external). If
			* there's a fragment but the prefixed text is empty, we just return a link
			* to the fragment.
			*
			* The result obviously should not be URL-escaped, but does need to be
			* HTML-escaped if it's being output in HTML.
			*
			* @param string\|array $query
			* @param string\|string[]\|false $query2 deprecated since MW 1.19; ignored since MW 1.41
			* @param string\|int\|false $proto A PROTO_* constant on how the URL should be expanded,
			* or false (default) for no expansion
			* @see self::getLocalURL for the arguments.
			* @return string The URL
			*/
			public function getLinkURL( $query = '', $query2 = false, $proto = false ) {
			if ( $this->isExternal() \|\| $proto !== false ) {
			$ret = $this->getFullURL( $query, false, $proto );
			} elseif ( $this->getPrefixedText() === '' && $this->hasFragment() ) {
			$ret = $this->getFragmentForURL();
			} else {
			$ret = $this->getLocalURL( $query ) . $this->getFragmentForURL();
			}
			return $ret;
			}

			/**
			* Get the URL form for an internal link.
			* - Used in various CDN-related code, in case we have a different
			* internal hostname for the server from the exposed one.
			*
			* This uses $wgInternalServer to qualify the path, or $wgServer
			* if $wgInternalServer is not set. If the server variable used is
			* protocol-relative, the URL will be expanded to http://
			*
			* @see self::getLocalURL for the arguments.
			* @param string\|array $query
			* @return string The URL
			*/
			public function getInternalURL( $query = '' ) {
			global $wgInternalServer, $wgServer;
			$services = MediaWikiServices::getInstance();

			$query = is_array( $query ) ? wfArrayToCgi( $query ) : $query;

			$server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
			$url = (string)$services->getUrlUtils()->expand( $server . $this->getLocalURL( $query ), PROTO_HTTP );
			( new HookRunner( $services->getHookContainer() ) )
			->onGetInternalURL( $this, $url, $query );
			return $url;
			}

			/**
			* Get the URL for a canonical link, for use in things like IRC and
			* e-mail notifications. Uses $wgCanonicalServer and the
			* GetCanonicalURL hook.
			*
			* NOTE: Unlike getInternalURL(), the canonical URL includes the fragment
			*
			* @see self::getLocalURL for the arguments.
			* @param string\|array $query
			* @return string The URL
			* @since 1.18
			*/
			public function getCanonicalURL( $query = '' ) {
			$services = MediaWikiServices::getInstance();

			$query = is_array( $query ) ? wfArrayToCgi( $query ) : $query;

			$url = (string)$services->getUrlUtils()->expand(
			$this->getLocalURL( $query ) . $this->getFragmentForURL(),
			PROTO_CANONICAL
			);
			( new HookRunner( $services->getHookContainer() ) )
			->onGetCanonicalURL( $this, $url, $query );
			return $url;
			}

			/**
			* Get the edit URL for this Title
			*
			* @return string The URL, or a null string if this is an interwiki link
			*/
			public function getEditURL() {
			if ( $this->isExternal() ) {
			return '';
			}
			$s = $this->getLocalURL( 'action=edit' );

			return $s;
			}

			/**
			* Is this title subject to title protection?
			* Title protection is the one applied against creation of such title.
			*
			* @deprecated since 1.37, use RestrictionStore::getCreateProtection() instead;
			* hard-deprecated since 1.43
			*
			* @return array\|bool An associative array representing any existent title
			* protection, or false if there's none.
			*/
			public function getTitleProtection() {
			wfDeprecated( __METHOD__, '1.37' );
			return MediaWikiServices::getInstance()->getRestrictionStore()->getCreateProtection( $this )
			?: false;
			}

			/**
			* Remove any title protection due to page existing
			*
			* @deprecated since 1.37, do not use (this is only for WikiPage::onArticleCreate)
			* hard-deprecated since 1.44
			*/
			public function deleteTitleProtection() {
			wfDeprecated( __METHOD__, '1.37' );
			MediaWikiServices::getInstance()->getRestrictionStore()->deleteCreateProtection( $this );
			}

			/**
			* Load restrictions from the page_restrictions table
			*
			* @deprecated since 1.37, no public replacement; hard-deprecated since 1.43
			*
			* @param int $flags A bit field. If IDBAccessObject::READ_LATEST is set, skip replicas and read
			* from the primary DB.
			*/
			public function loadRestrictions( $flags = 0 ) {
			wfDeprecated( __METHOD__, '1.37' );
			MediaWikiServices::getInstance()->getRestrictionStore()->loadRestrictions( $this, $flags );
			}

			/**
			* Flush the protection cache in this object and force reload from the database.
			* This is used when updating protection from WikiPage::doUpdateRestrictions().
			*
			* @deprecated since 1.37, now internal; hard-deprecated since 1.43
			*/
			public function flushRestrictions() {
			wfDeprecated( __METHOD__, '1.37' );
			MediaWikiServices::getInstance()->getRestrictionStore()->flushRestrictions( $this );
			}

			/**
			* Purge expired restrictions from the page_restrictions table
			*
			* This will purge no more than $wgUpdateRowsPerQuery page_restrictions rows
			*/
			public static function purgeExpiredRestrictions() {
			if ( MediaWikiServices::getInstance()->getReadOnlyMode()->isReadOnly() ) {
			return;
			}

			DeferredUpdates::addUpdate( new AutoCommitUpdate(
			MediaWikiServices::getInstance()->getConnectionProvider()->getPrimaryDatabase(),
			__METHOD__,
			static function ( IDatabase $dbw, $fname ) {
			$config = MediaWikiServices::getInstance()->getMainConfig();
			$ids = $dbw->newSelectQueryBuilder()
			->select( 'pr_id' )
			->from( 'page_restrictions' )
			->where( $dbw->expr( 'pr_expiry', '<', $dbw->timestamp() ) )
			->limit( $config->get( MainConfigNames::UpdateRowsPerQuery ) ) // T135470
			->caller( $fname )->fetchFieldValues();
			if ( $ids ) {
			$dbw->newDeleteQueryBuilder()
			->deleteFrom( 'page_restrictions' )
			->where( [ 'pr_id' => $ids ] )
			->caller( $fname )->execute();
			}

			$dbw->newDeleteQueryBuilder()
			->deleteFrom( 'protected_titles' )
			->where( $dbw->expr( 'pt_expiry', '<', $dbw->timestamp() ) )
			->caller( $fname )->execute();
			}
			) );
			}

			/**
			* Does this have subpages? (Warning, usually requires an extra DB query.)
			*
			* @return bool
			*/
			public function hasSubpages() {
			if (
			!MediaWikiServices::getInstance()->getNamespaceInfo()->
			hasSubpages( $this->mNamespace )
			) {
			# Duh
			return false;
			}

			# We dynamically add a member variable for the purpose of this method
			# alone to cache the result. There's no point in having it hanging
			# around uninitialized in every Title object; therefore we only add it
			# if needed and don't declare it statically.
			if ( $this->mHasSubpages === null ) {
			$subpages = $this->getSubpages( 1 );
			$this->mHasSubpages = $subpages instanceof TitleArrayFromResult && $subpages->count();
			}

			return $this->mHasSubpages;
			}

			/**
			* Get all subpages of this page.
			*
			* @param int $limit Maximum number of subpages to fetch; -1 for no limit
			* @return TitleArrayFromResult\|array TitleArrayFromResult, or empty array if this page's namespace
			* doesn't allow subpages
			*/
			public function getSubpages( $limit = -1 ) {
			if (
			!MediaWikiServices::getInstance()->getNamespaceInfo()->
			hasSubpages( $this->mNamespace )
			) {
			return [];
			}

			$services = MediaWikiServices::getInstance();
			$pageStore = $services->getPageStore();
			$titleFactory = $services->getTitleFactory();
			$query = $pageStore->newSelectQueryBuilder()
			->fields( $pageStore->getSelectFields() )
			->whereTitlePrefix( $this->getNamespace(), $this->getDBkey() . '/' )
			->caller( __METHOD__ );
			if ( $limit > -1 ) {
			$query->limit( $limit );
			}

			return $titleFactory->newTitleArrayFromResult( $query->fetchResultSet() );
			}

			/**
			* Is there a version of this page in the deletion archive?
			*
			* @deprecated since 1.36. Use self::getDeletedEditsCount()
			* @return int The number of archived revisions
			*/
			public function isDeleted() {
			return $this->getDeletedEditsCount();
			}

			/**
			* Is there a version of this page in the deletion archive?
			*
			* @since 1.36
			* @return int The number of archived revisions
			*/
			public function getDeletedEditsCount() {
			if ( $this->mNamespace < 0 ) {
			return 0;
			}

			$dbr = $this->getDbProvider()->getReplicaDatabase();
			$n = (int)$dbr->newSelectQueryBuilder()
			->select( 'COUNT(*)' )
			->from( 'archive' )
			->where( [ 'ar_namespace' => $this->mNamespace, 'ar_title' => $this->mDbkeyform ] )
			->caller( __METHOD__ )->fetchField();
			if ( $this->mNamespace === NS_FILE ) {
			$n += $dbr->newSelectQueryBuilder()
			->select( 'COUNT(*)' )
			->from( 'filearchive' )
			->where( [ 'fa_name' => $this->mDbkeyform ] )
			->caller( __METHOD__ )->fetchField();
			}
			return $n;
			}

			/**
			* Is there a version of this page in the deletion archive?
			*
			* @deprecated since 1.36, Use self::hasDeletedEdits()
			* @return bool
			*/
			public function isDeletedQuick() {
			return $this->hasDeletedEdits();
			}

			/**
			* Is there a version of this page in the deletion archive?
			*
			* @since 1.36
			* @return bool
			*/
			public function hasDeletedEdits() {
			if ( $this->mNamespace < 0 ) {
			return false;
			}
			$dbr = $this->getDbProvider()->getReplicaDatabase();
			$deleted = (bool)$dbr->newSelectQueryBuilder()
			->select( '1' )
			->from( 'archive' )
			->where( [ 'ar_namespace' => $this->mNamespace, 'ar_title' => $this->mDbkeyform ] )
			->caller( __METHOD__ )->fetchField();
			if ( !$deleted && $this->mNamespace === NS_FILE ) {
			$deleted = (bool)$dbr->newSelectQueryBuilder()
			->select( '1' )
			->from( 'filearchive' )
			->where( [ 'fa_name' => $this->mDbkeyform ] )
			->caller( __METHOD__ )->fetchField();
			}
			return $deleted;
			}

			/**
			* Get the article ID for this Title from the link cache,
			* adding it if necessary
			*
			* @param int $flags A bitfield of IDBAccessObject::READ_* constants
			* @return int The ID
			*/
			public function getArticleID( $flags = 0 ) {
			if ( $this->mArticleID === -1 && !$this->canExist() ) {
			$this->mArticleID = 0;

			return $this->mArticleID;
			}

			if ( $this->mArticleID === -1 \|\| $this->shouldReadLatest( $flags ) ) {
			$this->mArticleID = (int)$this->getFieldFromPageStore( 'page_id', $flags );
			}

			return $this->mArticleID;
			}

			/**
			* Is this an article that is a redirect page?
			* Uses link cache, adding it if necessary.
			*
			* This is intended to provide fast access to page_is_redirect for linking.
			* In rare cases, there might not be a valid target in the redirect table
			* even though this function returns true.
			*
			* To find a redirect target, just call WikiPage::getRedirectTarget() and
			* check if it returns null, there's no need to call this first.
			*
			* @param int $flags A bitfield of IDBAccessObject::READ_* constants
			* @return bool
			*/
			public function isRedirect( $flags = 0 ) {
			if ( $this->shouldReadLatest( $flags ) \|\| $this->mRedirect === null ) {
			$this->mRedirect = (bool)$this->getFieldFromPageStore( 'page_is_redirect', $flags );
			}

			return $this->mRedirect;
			}

			/**
			* What is the length of this page?
			* Uses link cache, adding it if necessary
			*
			* @param int $flags A bitfield of IDBAccessObject::READ_* constants
			* @return int
			*/
			public function getLength( $flags = 0 ) {
			if ( $this->shouldReadLatest( $flags ) \|\| $this->mLength < 0 ) {
			$this->mLength = (int)$this->getFieldFromPageStore( 'page_len', $flags );
			}

			if ( $this->mLength < 0 ) {
			$this->mLength = 0;
			}

			return $this->mLength;
			}

			/**
			* What is the page_latest field for this page?
			*
			* @param int $flags A bitfield of IDBAccessObject::READ_* constants
			* @return int Int or 0 if the page doesn't exist
			*/
			public function getLatestRevID( $flags = 0 ) {
			if ( $this->shouldReadLatest( $flags ) \|\| $this->mLatestID === false ) {
			$this->mLatestID = (int)$this->getFieldFromPageStore( 'page_latest', $flags );
			}

			if ( !$this->mLatestID ) {
			$this->mLatestID = 0;
			}

			return $this->mLatestID;
			}

			/**
			* Inject a page ID, reset DB-loaded fields, and clear the link cache for this title
			*
			* This can be called on page insertion to allow loading of the new page_id without
			* having to create a new Title instance. Likewise with deletion.
			*
			* This is also used during page moves, to reflect the change in the relationship
			* between article ID and title text.
			*
			* @note This overrides Title::setContentModel()
			*
			* @param int\|bool $id Page ID, 0 for non-existent, or false for "unknown" (lazy-load)
			*/
			public function resetArticleID( $id ) {
			if ( $id === false ) {
			$this->mArticleID = -1;
			} else {
			$this->mArticleID = (int)$id;
			}
			$this->mRedirect = null;
			$this->mLength = -1;
			$this->mLatestID = false;
			$this->mContentModel = false;
			$this->mForcedContentModel = false;
			$this->mEstimateRevisions = null;
			$this->mPageLanguage = null;
			$this->mDbPageLanguage = false;
			$this->mIsBigDeletion = null;

			$this->uncache();
			MediaWikiServices::getInstance()->getLinkCache()->clearLink( $this );
			MediaWikiServices::getInstance()->getRestrictionStore()->flushRestrictions( $this );
			}

			public static function clearCaches() {
			if ( MediaWikiServices::hasInstance() ) {
			$linkCache = MediaWikiServices::getInstance()->getLinkCache();
			$linkCache->clear();
			}

			// Reset cached main page instance (T395214).
			self::$cachedMainPage = null;

			$titleCache = self::getTitleCache();
			$titleCache->clear();
			}

			/**
			* Capitalize a text string for a title if it belongs to a namespace that capitalizes
			*
			* @param string $text Containing title to capitalize
			* @param int $ns Namespace index, defaults to NS_MAIN
			* @return string Containing capitalized title
			*/
			public static function capitalize( $text, $ns = NS_MAIN ) {
			$services = MediaWikiServices::getInstance();
			if ( $services->getNamespaceInfo()->isCapitalized( $ns ) ) {
			return $services->getContentLanguage()->ucfirst( $text );
			} else {
			return $text;
			}
			}

			/**
			* Secure and split - main initialisation function for this object
			*
			* Assumes that $text is urldecoded
			* and uses underscores, but not otherwise munged. This function
			* removes illegal characters, splits off the interwiki and
			* namespace prefixes, sets the other forms, and canonicalizes
			* everything.
			*
			* If this method returns normally, the Title is valid.
			*
			* @param string $text
			* @param int\|null $defaultNamespace
			*
			* @throws MalformedTitleException On malformed titles
			*/
			private function secureAndSplit( $text, $defaultNamespace = null ) {
			$defaultNamespace ??= self::DEFAULT_NAMESPACE;

			// @note: splitTitleString() is a temporary hack to allow TitleParser to share
			// the parsing code with Title, while avoiding massive refactoring.
			// @todo: get rid of secureAndSplit, refactor parsing code.
			$titleParser = MediaWikiServices::getInstance()->getTitleParser();
			// MalformedTitleException can be thrown here
			$parts = $titleParser->splitTitleString( $text, $defaultNamespace );

			# Fill fields
			$this->setFragment( '#' . $parts['fragment'] );
			$this->mInterwiki = $parts['interwiki'];
			$this->mLocalInterwiki = $parts['local_interwiki'];
			$this->mNamespace = $parts['namespace'];

			$this->mDbkeyform = $parts['dbkey'];
			$this->mUrlform = wfUrlencode( $this->mDbkeyform );
			$this->mTextform = strtr( $this->mDbkeyform, '_', ' ' );

			// splitTitleString() guarantees that this title is valid.
			$this->mIsValid = true;

			# We already know that some pages won't be in the database!
			if ( $this->isExternal() \|\| $this->isSpecialPage() \|\| $this->mTextform === '' ) {
			$this->mArticleID = 0;
			}
			}

			/**
			* Get an array of Title objects linking to this Title
			* Also stores the IDs in the link cache.
			*
			* WARNING: do not use this function on arbitrary user-supplied titles!
			* On heavily-used templates it will max out the memory.
			*
			* @param array $options May be FOR UPDATE
			* @param string $table Table name
			* @param string $prefix Fields prefix
			* @return Title[]
			*/
			public function getLinksTo( $options = [], $table = 'pagelinks', $prefix = 'pl' ) {
			if ( count( $options ) > 0 ) {
			$db = $this->getDbProvider()->getPrimaryDatabase();
			} else {
			$db = $this->getDbProvider()->getReplicaDatabase();
			}

			$linksMigration = MediaWikiServices::getInstance()->getLinksMigration();
			if ( isset( $linksMigration::$mapping[$table] ) ) {
			$titleConds = $linksMigration->getLinksConditions( $table, $this );
			} else {
			$titleConds = [
			"{$prefix}_namespace" => $this->mNamespace,
			"{$prefix}_title" => $this->mDbkeyform
			];
			}

			$res = $db->newSelectQueryBuilder()
			->select( LinkCache::getSelectFields() )
			->from( $table )
			->join( 'page', null, "{$prefix}_from=page_id" )
			->where( $titleConds )
			->options( $options )
			->caller( __METHOD__ )
			->fetchResultSet();

			$retVal = [];
			if ( $res->numRows() ) {
			$linkCache = MediaWikiServices::getInstance()->getLinkCache();
			foreach ( $res as $row ) {
			$titleObj = self::makeTitle( $row->page_namespace, $row->page_title );
			if ( $titleObj ) {
			$linkCache->addGoodLinkObjFromRow( $titleObj, $row );
			$retVal[] = $titleObj;
			}
			}
			}
			return $retVal;
			}

			/**
			* Get an array of Title objects using this Title as a template
			* Also stores the IDs in the link cache.
			*
			* WARNING: do not use this function on arbitrary user-supplied titles!
			* On heavily-used templates it will max out the memory.
			*
			* @param array $options Query option to Database::select()
			* @return Title[]
			*/
			public function getTemplateLinksTo( $options = [] ) {
			return $this->getLinksTo( $options, 'templatelinks', 'tl' );
			}

			/**
			* Get an array of Title objects linked from this Title
			* Also stores the IDs in the link cache.
			*
			* WARNING: do not use this function on arbitrary user-supplied titles!
			* On heavily-used templates it will max out the memory.
			*
			* @param array $options Query option to Database::select()
			* @param string $table Table name
			* @param string $prefix Fields prefix
			* @return Title[] List of Titles linking here
			*/
			public function getLinksFrom( $options = [], $table = 'pagelinks', $prefix = 'pl' ) {
			$id = $this->getArticleID();

			# If the page doesn't exist; there can't be any link from this page
			if ( !$id ) {
			return [];
			}

			$db = $this->getDbProvider()->getReplicaDatabase();
			$linksMigration = MediaWikiServices::getInstance()->getLinksMigration();

			$queryBuilder = $db->newSelectQueryBuilder();
			if ( isset( $linksMigration::$mapping[$table] ) ) {
			[ $blNamespace, $blTitle ] = $linksMigration->getTitleFields( $table );
			$linktargetQueryInfo = $linksMigration->getQueryInfo( $table );
			$queryBuilder->queryInfo( $linktargetQueryInfo );
			} else {
			$blNamespace = "{$prefix}_namespace";
			$blTitle = "{$prefix}_title";
			$queryBuilder->select( [ $blNamespace, $blTitle ] )
			->from( $table );
			}

			$pageQuery = WikiPage::getQueryInfo();
			$res = $queryBuilder
			->where( [ "{$prefix}_from" => $id ] )
			->leftJoin( 'page', null, [ "page_namespace=$blNamespace", "page_title=$blTitle" ] )
			->fields( $pageQuery['fields'] )
			->options( $options )
			->caller( __METHOD__ )
			->fetchResultSet();

			$retVal = [];
			$linkCache = MediaWikiServices::getInstance()->getLinkCache();
			foreach ( $res as $row ) {
			if ( $row->page_id ) {
			$titleObj = self::newFromRow( $row );
			} else {
			$titleObj = self::makeTitle( $row->$blNamespace, $row->$blTitle );
			$linkCache->addBadLinkObj( $titleObj );
			}
			$retVal[] = $titleObj;
			}

			return $retVal;
			}

			/**
			* Get an array of Title objects used on this Title as a template
			* Also stores the IDs in the link cache.
			*
			* WARNING: do not use this function on arbitrary user-supplied titles!
			* On heavily-used templates it will max out the memory.
			*
			* @param array $options May be FOR UPDATE
			* @return Title[]
			*/
			public function getTemplateLinksFrom( $options = [] ) {
			return $this->getLinksFrom( $options, 'templatelinks', 'tl' );
			}

			/**
			* Locks the page row and check if this page is single revision redirect
			*
			* This updates the cached fields of this instance via Title::loadFromRow()
			*
			* @return bool
			*/
			public function isSingleRevRedirect() {
			$dbw = $this->getDbProvider()->getPrimaryDatabase();
			$dbw->startAtomic( __METHOD__ );
			$pageStore = MediaWikiServices::getInstance()->getPageStore();

			$row = $dbw->newSelectQueryBuilder()
			->select( $pageStore->getSelectFields() )
			->from( 'page' )
			->where( $this->pageCond() )
			->caller( __METHOD__ )->fetchRow();
			// Update the cached fields
			$this->loadFromRow( $row );

			if ( $this->mRedirect && $this->mLatestID ) {
			$isSingleRevRedirect = !$dbw->newSelectQueryBuilder()
			->select( '1' )
			->forUpdate()
			->from( 'revision' )
			->where( [ 'rev_page' => $this->mArticleID, $dbw->expr( 'rev_id', '!=', (int)$this->mLatestID ) ] )
			->caller( __METHOD__ )->fetchField();
			} else {
			$isSingleRevRedirect = false;
			}

			$dbw->endAtomic( __METHOD__ );

			return $isSingleRevRedirect;
			}

			/**
			* Get categories to which this Title belongs and return an array of
			* categories' names.
			*
			* @return string[] Array of parents in the form:
			* $parent => $currentarticle
			*/
			public function getParentCategories() {
			$data = [];

			$titleKey = $this->getArticleID();

			if ( $titleKey === 0 ) {
			return $data;
			}

			$migrationStage = MediaWikiServices::getInstance()->getMainConfig()->get(
			MainConfigNames::CategoryLinksSchemaMigrationStage
			);

			$dbr = $this->getDbProvider()->getReplicaDatabase();
			$queryBuilder = $dbr->newSelectQueryBuilder()
			->from( 'categorylinks' )
			->where( [ 'cl_from' => $titleKey ] );

			if ( $migrationStage & SCHEMA_COMPAT_READ_OLD ) {
			$queryBuilder->select( 'cl_to' );
			} else {
			$queryBuilder->field( 'lt_title', 'cl_to' )
			->join( 'linktarget', null, 'cl_target_id = lt_id' )
			->where( [ 'lt_namespace' => NS_CATEGORY ] );
			}
			$res = $queryBuilder->caller( __METHOD__ )->fetchResultSet();

			if ( $res->numRows() > 0 ) {
			$contLang = MediaWikiServices::getInstance()->getContentLanguage();
			foreach ( $res as $row ) {
			// $data[] = Title::newFromText( $contLang->getNsText ( NS_CATEGORY ).':'.$row->cl_to);
			$data[$contLang->getNsText( NS_CATEGORY ) . ':' . $row->cl_to] =
			$this->getFullText();
			}
			}
			return $data;
			}

			/**
			* Get a tree of parent categories
			*
			* @param array $children Array with the children in the keys, to check for circular refs
			* @return array Tree of parent categories
			*/
			public function getParentCategoryTree( $children = [] ) {
			$stack = [];
			$parents = $this->getParentCategories();

			if ( $parents ) {
			foreach ( $parents as $parent => $current ) {
			if ( array_key_exists( $parent, $children ) ) {
			# Circular reference
			$stack[$parent] = [];
			} else {
			$nt = self::newFromText( $parent );
			if ( $nt ) {
			$stack[$parent] = $nt->getParentCategoryTree( $children + [ $parent => 1 ] );
			}
			}
			}
			}

			return $stack;
			}

			/**
			* Get an associative array for selecting this title from
			* the "page" table
			*
			* @return array Array suitable for the $where parameter of DB::select()
			*/
			public function pageCond() {
			if ( $this->mArticleID > 0 ) {
			// PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
			return [ 'page_id' => $this->mArticleID ];
			} else {
			return [ 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform ];
			}
			}

			/**
			* Check if this is a new page.
			*
			* @note This returns false if the page does not exist.
			* @param int $flags one of the READ_XXX constants.
			*
			* @return bool
			*/
			public function isNewPage( $flags = IDBAccessObject::READ_NORMAL ) {
			// NOTE: we rely on PHP casting "0" to false here.
			return (bool)$this->getFieldFromPageStore( 'page_is_new', $flags );
			}

			/**
			* Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
			* @deprecated since 1.37 External callers shouldn't need to know about this.
			*
			* @return bool
			*/
			public function isBigDeletion() {
			global $wgDeleteRevisionsLimit;

			if ( !$wgDeleteRevisionsLimit ) {
			return false;
			}

			if ( $this->mIsBigDeletion === null ) {
			$dbr = $this->getDbProvider()->getReplicaDatabase();
			$revCount = $dbr->newSelectQueryBuilder()
			->select( '1' )
			->from( 'revision' )
			->where( [ 'rev_page' => $this->getArticleID() ] )
			->limit( $wgDeleteRevisionsLimit + 1 )
			->caller( __METHOD__ )->fetchRowCount();

			$this->mIsBigDeletion = $revCount > $wgDeleteRevisionsLimit;
			}

			return $this->mIsBigDeletion;
			}

			/**
			* Get the approximate revision count of this page.
			*
			* @return int
			*/
			public function estimateRevisionCount() {
			if ( !$this->exists() ) {
			return 0;
			}

			if ( $this->mEstimateRevisions === null ) {
			$dbr = $this->getDbProvider()->getReplicaDatabase();
			$this->mEstimateRevisions = $dbr->newSelectQueryBuilder()
			->select( '*' )
			->from( 'revision' )
			->where( [ 'rev_page' => $this->getArticleID() ] )
			->caller( __METHOD__ )
			->estimateRowCount();
			}

			return $this->mEstimateRevisions;
			}

			/**
			* Compares with another Title.
			*
			* A Title object is considered equal to another Title if it has the same text,
			* the same interwiki prefix, and the same namespace.
			*
			* @note This is different from {@see LinkTarget::isSameLinkAs} which also compares the fragment
			* part.
			*
			* @phpcs:disable MediaWiki.Commenting.FunctionComment.ObjectTypeHintParam
			* @param Title\|object $other
			*
			* @return bool
			*/
			public function equals( object $other ) {
			// NOTE: In contrast to isSameLinkAs(), this ignores the fragment part!
			// NOTE: In contrast to isSamePageAs(), this ignores the page ID!
			// NOTE: === is necessary for proper matching of number-like titles
			return $other instanceof Title
			&& $this->getInterwiki() === $other->getInterwiki()
			&& $this->getNamespace() === $other->getNamespace()
			&& $this->getDBkey() === $other->getDBkey();
			}

			/**
			* @inheritDoc
			* @since 1.36
			*/
			public function isSamePageAs( PageReference $other ): bool {
			// NOTE: keep in sync with PageReferenceValue::isSamePageAs()!
			return $this->getWikiId() === $other->getWikiId()
			&& $this->getNamespace() === $other->getNamespace()
			&& $this->getDBkey() === $other->getDBkey();
			}

			/**
			* Check if this title is a subpage of another title
			*
			* @param Title $title
			* @return bool
			*/
			public function isSubpageOf( Title $title ) {
			return $this->mInterwiki === $title->mInterwiki
			&& $this->mNamespace == $title->mNamespace
			&& str_starts_with( $this->mDbkeyform, $title->mDbkeyform . '/' );
			}

			/**
			* Check if page exists. For historical reasons, this function simply
			* checks for the existence of the title in the page table, and will
			* thus return false for interwiki links, special pages and the like.
			* If you want to know if a title can be meaningfully viewed, you should
			* probably call the isKnown() method instead.
			*
			* @param int $flags A bitfield of IDBAccessObject::READ_* constants
			* @return bool
			*/
			public function exists( $flags = 0 ): bool {
			$exists = $this->getArticleID( $flags ) != 0;
			( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )->onTitleExists( $this, $exists );
			return $exists;
			}

			/**
			* Should links to this title be shown as potentially viewable (i.e. as
			* "bluelinks"), even if there's no record by this title in the page
			* table?
			*
			* This function is semi-deprecated for public use, as well as somewhat
			* misleadingly named. You probably just want to call isKnown(), which
			* calls this function internally.
			*
			* (ISSUE: Most of these checks are cheap, but the file existence check
			* can potentially be quite expensive. Including it here fixes a lot of
			* existing code, but we might want to add an optional parameter to skip
			* it and any other expensive checks.)
			*
			* @return bool
			*/
			public function isAlwaysKnown() {
			$isKnown = null;

			$services = MediaWikiServices::getInstance();
			( new HookRunner( $services->getHookContainer() ) )->onTitleIsAlwaysKnown( $this, $isKnown );

			if ( $isKnown !== null ) {
			return $isKnown;
			}

			if ( $this->isExternal() ) {
			return true; // any interwiki link might be viewable, for all we know
			}

			switch ( $this->mNamespace ) {
			case NS_MEDIA:
			case NS_FILE:
			// file exists, possibly in a foreign repo
			return (bool)$services->getRepoGroup()->findFile( $this );
			case NS_SPECIAL:
			// valid special page
			return $services->getSpecialPageFactory()->exists( $this->mDbkeyform );
			case NS_MAIN:
			// selflink, possibly with fragment
			return $this->mDbkeyform == '';
			case NS_MEDIAWIKI:
			// known system message
			return $this->hasSourceText() !== false;
			default:
			return false;
			}
			}

			/**
			* Does this title refer to a page that can (or might) be meaningfully
			* viewed? In particular, this function may be used to determine if
			* links to the title should be rendered as "bluelinks" (as opposed to
			* "redlinks" to non-existent pages).
			* Adding something else to this function will cause inconsistency
			* since LinkHolderArray calls isAlwaysKnown() and does its own
			* page existence check.
			*
			* @return bool
			*/
			public function isKnown() {
			return $this->isAlwaysKnown() \|\| $this->exists();
			}

			/**
			* Does this page have source text?
			*
			* @return bool
			*/
			public function hasSourceText() {
			if ( $this->exists() ) {
			return true;
			}

			if ( $this->mNamespace === NS_MEDIAWIKI ) {
			$services = MediaWikiServices::getInstance();
			// If the page doesn't exist but is a known system message, default
			// message content will be displayed, same for language subpages-
			// Use always content language to avoid loading hundreds of languages
			// to get the link color.
			$contLang = $services->getContentLanguage();
			[ $name, ] = $services->getMessageCache()->figureMessage(
			$contLang->lcfirst( $this->getText() )
			);
			$message = wfMessage( $name )->inLanguage( $contLang )->useDatabase( false );
			return $message->exists();
			}

			return false;
			}

			/**
			* Get the default (plain) message contents for a page that overrides an
			* interface message key.
			*
			* Primary use cases:
			*
			* - Article:
			* - Show default when viewing the page. The Article::getSubstituteContent
			* method displays the default message content, instead of the
			* 'noarticletext' placeholder message normally used.
			*
			* - EditPage:
			* - Title of edit page. When creating an interface message override,
			* the editor is told they are "Editing the page", instead of
			* "Creating the page". (EditPage::setHeaders)
			* - Edit notice. The 'translateinterface' edit notice is shown when creating
			* or editing an interface message override. (EditPage::showIntro)
			* - Opening the editor. The contents of the localisation message are used
			* as contents of the editor when creating a new page in the MediaWiki
			* namespace. This simplifies the process for editors when "changing"
			* an interface message by creating an override. (EditPage::getContentObject)
			* - Showing a diff. The left-hand side of a diff when an editor is
			* previewing their changes before saving the creation of a page in the
			* MediaWiki namespace. (EditPage::showDiff)
			* - Disallowing a save. When attempting to create a MediaWiki-namespace
			* page with the proposed content matching the interface message default,
			* the save is rejected, the same way we disallow blank pages from being
			* created. (EditPage using DefaultTextConstraint)
			*
			* - ApiEditPage:
			* - Default content, when using the 'prepend' or 'append' feature.
			*
			* - SkinTemplate:
			* - Label the create action as "Edit", if the page can be an override.
			*
			* @return string\|false
			*/
			public function getDefaultMessageText() {
			$message = $this->getDefaultSystemMessage();

			return $message ? $message->plain() : false;
			}

			/**
			* Same as getDefaultMessageText, but returns a Message object.
			*
			* @see ::getDefaultMessageText
			*
			* @return ?Message
			*/
			public function getDefaultSystemMessage(): ?Message {
			if ( $this->mNamespace !== NS_MEDIAWIKI ) { // Just in case
			return null;
			}

			[ $name, $lang ] = MediaWikiServices::getInstance()->getMessageCache()->figureMessage(
			MediaWikiServices::getInstance()->getContentLanguage()->lcfirst( $this->getText() )
			);

			if ( wfMessage( $name )->inLanguage( $lang )->useDatabase( false )->exists() ) {
			return wfMessage( $name )->inLanguage( $lang );
			} else {
			return null;
			}
			}

			/**
			* Updates page_touched for this page; called from LinksUpdate.php
			*
			* @param string\|null $purgeTime [optional] TS_MW timestamp
			* @return bool True if the update succeeded
			*/
			public function invalidateCache( $purgeTime = null ) {
			if ( MediaWikiServices::getInstance()->getReadOnlyMode()->isReadOnly() ) {
			return false;
			}
			if ( $this->mArticleID === 0 ) {
			// avoid gap locking if we know it's not there
			return true;
			}

			$conds = $this->pageCond();

			// Periodically recompute page_random (T309477). This mitigates bias on
			// Special:Random due deleted pages leaving "gaps" in the distribution.
			//
			// Optimization: Update page_random only for 10% of updates.
			// Optimization: Do this outside the main transaction to avoid locking for too long.
			// Optimization: Update page_random alongside page_touched to avoid extra database writes.
			DeferredUpdates::addUpdate(
			new AutoCommitUpdate(
			$this->getDbProvider()->getPrimaryDatabase(),
			__METHOD__,
			function ( IDatabase $dbw, $fname ) use ( $conds, $purgeTime ) {
			$dbTimestamp = $dbw->timestamp( $purgeTime ?: time() );
			$update = $dbw->newUpdateQueryBuilder()
			->update( 'page' )
			->set( [ 'page_touched' => $dbTimestamp ] )
			->where( $conds )
			->andWhere( $dbw->expr( 'page_touched', '<', $dbTimestamp ) );

			if ( mt_rand( 1, 10 ) === 1 ) {
			$update->andSet( [ 'page_random' => wfRandom() ] );
			}

			$update->caller( $fname )->execute();

			MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $this );

			WikiModule::invalidateModuleCache(
			$this, null, null, $dbw->getDomainID() );
			}
			),
			DeferredUpdates::PRESEND
			);

			return true;
			}

			/**
			* Update page_touched timestamps and send CDN purge messages for
			* pages linking to this title. May be sent to the job queue depending
			* on the number of links. Typically called on create and delete.
			*/
			public function touchLinks() {
			$jobs = [];
			$jobs[] = HTMLCacheUpdateJob::newForBacklinks(
			$this,
			'pagelinks',
			[ 'causeAction' => 'page-touch' ]
			);
			if ( $this->mNamespace === NS_CATEGORY ) {
			$jobs[] = HTMLCacheUpdateJob::newForBacklinks(
			$this,
			'categorylinks',
			[ 'causeAction' => 'category-touch' ]
			);
			}

			MediaWikiServices::getInstance()->getJobQueueGroup()->lazyPush( $jobs );
			}

			/**
			* Get the last touched timestamp
			*
			* @param int $flags one of the READ_XXX constants.
			* @return string\|false Last-touched timestamp
			*/
			public function getTouched( int $flags = IDBAccessObject::READ_NORMAL ) {
			$touched = $this->getFieldFromPageStore( 'page_touched', $flags );
			return $touched ? MWTimestamp::convert( TS_MW, $touched ) : false;
			}

			/**
			* Generate strings used for xml 'id' names in monobook tabs
			*
			* @param string $prepend Defaults to 'nstab-'
			* @return string XML 'id' name
			*/
			public function getNamespaceKey( $prepend = 'nstab-' ) {
			// Gets the subject namespace of this title
			$nsInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
			$subjectNS = $nsInfo->getSubject( $this->mNamespace );
			// Prefer canonical namespace name for HTML IDs
			$namespaceKey = $nsInfo->getCanonicalName( $subjectNS );
			if ( $namespaceKey === false ) {
			// Fallback to localised text
			$namespaceKey = $this->getSubjectNsText();
			}
			// Makes namespace key lowercase
			$namespaceKey = MediaWikiServices::getInstance()->getContentLanguage()->lc( $namespaceKey );
			// Uses main
			if ( $namespaceKey == '' ) {
			$namespaceKey = 'main';
			}
			// Changes file to image for backwards compatibility
			if ( $namespaceKey == 'file' ) {
			$namespaceKey = 'image';
			}
			return $prepend . $namespaceKey;
			}

			/**
			* Get all extant redirects to this Title
			*
			* @param int\|null $ns Single namespace to consider; null to consider all namespaces
			* @return Title[]
			*/
			public function getRedirectsHere( $ns = null ) {
			$redirs = [];

			$queryBuilder = $this->getDbProvider()->getReplicaDatabase()->newSelectQueryBuilder()
			->select( [ 'page_namespace', 'page_title' ] )
			->from( 'redirect' )
			->join( 'page', null, 'rd_from = page_id' )
			->where( [
			'rd_namespace' => $this->mNamespace,
			'rd_title' => $this->mDbkeyform,
			'rd_interwiki' => $this->isExternal() ? $this->mInterwiki : '',
			] );

			if ( $ns !== null ) {
			$queryBuilder->andWhere( [ 'page_namespace' => $ns ] );
			}

			$res = $queryBuilder->caller( __METHOD__ )->fetchResultSet();

			foreach ( $res as $row ) {
			$redirs[] = self::newFromRow( $row );
			}
			return $redirs;
			}

			/**
			* Check if this Title is a valid redirect target
			*
			* @return bool
			*/
			public function isValidRedirectTarget() {
			global $wgInvalidRedirectTargets;

			if ( $this->isSpecialPage() ) {
			// invalid redirect targets are stored in a global array, but explicitly disallow Userlogout here
			foreach ( [ 'Userlogout', ...$wgInvalidRedirectTargets ] as $target ) {
			if ( $this->isSpecial( $target ) ) {
			return false;
			}
			}
			return true;
			}

			// relative section links are not valid redirect targets (T278367)
			return $this->getDBkey() !== '' && $this->isValid();
			}

			/**
			* Whether the magic words __INDEX__ and __NOINDEX__ function for this page.
			*
			* @return bool
			*/
			public function canUseNoindex() {
			global $wgExemptFromUserRobotsControl;

			$bannedNamespaces = $wgExemptFromUserRobotsControl ??
			MediaWikiServices::getInstance()->getNamespaceInfo()->getContentNamespaces();

			return !in_array( $this->mNamespace, $bannedNamespaces );
			}

			/**
			* Returns the raw sort key to be used for categories, with the specified
			* prefix. This will be fed to Collation::getSortKey() to get a
			* binary sortkey that can be used for actual sorting.
			*
			* @param string $prefix The prefix to be used, specified using
			* {{defaultsort:}} or like [[Category:Foo\|prefix]]. Empty for no
			* prefix.
			* @return string
			*/
			public function getCategorySortkey( $prefix = '' ) {
			$unprefixed = $this->getText();

			// Anything that uses this hook should only depend
			// on the Title object passed in, and should probably
			// tell the users to run updateCollations.php --force
			// in order to re-sort existing category relations.
			( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )
			->onGetDefaultSortkey( $this, $unprefixed );
			if ( $prefix !== '' ) {
			# Separate with a line feed, so the unprefixed part is only used as
			# a tiebreaker when two pages have the exact same prefix.
			# In UCA, tab is the only character that can sort above LF
			# so we strip both of them from the original prefix.
			$prefix = strtr( $prefix, "\n\t", ' ' );
			return "$prefix\n$unprefixed";
			}
			return $unprefixed;
			}

			/**
			* Returns the page language code saved in the database, if $wgPageLanguageUseDB is set
			* to true in LocalSettings.php, otherwise returns null. If there is no language saved in
			* the database, it will return null.
			*
			* @param int $flags
			*
			* @return ?string
			*/
			private function getDbPageLanguageCode( int $flags = 0 ): ?string {
			global $wgPageLanguageUseDB;

			// check, if the page language could be saved in the database, and if so and
			// the value is not requested already, lookup the page language using PageStore
			if ( $wgPageLanguageUseDB && $this->mDbPageLanguage === false ) {
			$this->mDbPageLanguage = $this->getFieldFromPageStore( 'page_lang', $flags ) ?: null;
			}

			return $this->mDbPageLanguage ?: null;
			}

			/**
			* Returns the Language object from the page language code saved in the database.
			* If $wgPageLanguageUseDB is set to false or there is no language saved in the database
			* or the language code in the database is invalid or unsupported, it will return null.
			*
			* @return Language\|null
			*/
			private function getDbPageLanguage(): ?Language {
			$languageCode = $this->getDbPageLanguageCode();
			if ( $languageCode === null ) {
			return null;
			}
			$services = MediaWikiServices::getInstance();
			if ( !$services->getLanguageNameUtils()->isKnownLanguageTag( $languageCode ) ) {
			return null;
			}
			return $services->getLanguageFactory()->getLanguage( $languageCode );
			}

			/**
			* Get the language in which the content of this page is written in
			* wikitext. Defaults to content language, but in certain cases it can be
			* e.g. $wgLang (such as special pages, which are in the user language).
			*
			* @since 1.18
			* @return Language
			*/
			public function getPageLanguage() {
			global $wgLanguageCode;
			if ( $this->isSpecialPage() ) {
			// special pages are in the user language
			return RequestContext::getMain()->getLanguage();
			}

			// Checking if DB language is set
			$dbPageLanguage = $this->getDbPageLanguage();
			if ( $dbPageLanguage ) {
			return $dbPageLanguage;
			}

			$services = MediaWikiServices::getInstance();
			if ( !$this->mPageLanguage \|\| $this->mPageLanguage[1] !== $wgLanguageCode ) {
			// Note that this may depend on user settings, so the cache should
			// be only per-request.
			// NOTE: ContentHandler::getPageLanguage() may need to load the
			// content to determine the page language!
			// Checking $wgLanguageCode hasn't changed for the benefit of unit
			// tests.
			$contentHandler = $services->getContentHandlerFactory()
			->getContentHandler( $this->getContentModel() );
			$langObj = $contentHandler->getPageLanguage( $this );
			$this->mPageLanguage = [ $langObj->getCode(), $wgLanguageCode ];
			} else {
			$langObj = $services->getLanguageFactory()
			->getLanguage( $this->mPageLanguage[0] );
			}

			return $langObj;
			}

			/**
			* Get the language in which the content of this page is written when
			* viewed by user. Defaults to content language, but in certain cases it can be
			* e.g. the user language (such as special pages).
			*
			* @deprecated since 1.42 Use ParserOutput::getLanguage instead. See also OutputPage::getContLangForJS.
			* Hard-deprecated since 1.43.
			* @since 1.20
			* @return Language
			*/
			public function getPageViewLanguage() {
			wfDeprecated( __METHOD__, '1.42' );
			$services = MediaWikiServices::getInstance();

			if ( $this->isSpecialPage() ) {
			// If the user chooses a variant, the content is actually
			// in a language whose code is the variant code.
			$userLang = RequestContext::getMain()->getLanguage();
			$variant = $this->getLanguageConverter( $userLang )->getPreferredVariant();
			if ( $userLang->getCode() !== $variant ) {
			return $services->getLanguageFactory()
			->getLanguage( $variant );
			}

			return $userLang;
			}

			// Checking if DB language is set
			$pageLang = $this->getDbPageLanguage();
			if ( $pageLang ) {
			$variant = $this->getLanguageConverter( $pageLang )->getPreferredVariant();
			if ( $pageLang->getCode() !== $variant ) {
			return $services->getLanguageFactory()
			->getLanguage( $variant );
			}

			return $pageLang;
			}

			// @note Can't be cached persistently, depends on user settings.
			// @note ContentHandler::getPageViewLanguage() may need to load the
			// content to determine the page language!
			$contentHandler = $services->getContentHandlerFactory()
			->getContentHandler( $this->getContentModel() );
			$pageLang = $contentHandler->getPageViewLanguage( $this );
			return $pageLang;
			}

			/**
			* Get a list of rendered edit notices for this page.
			*
			* Array is keyed by the original message key, and values are rendered using parseAsBlock, so
			* they will already be wrapped in paragraphs.
			*
			* @since 1.21
			* @param int $oldid Revision ID that's being edited
			* @return string[]
			*/
			public function getEditNotices( $oldid = 0 ) {
			$notices = [];

			$editnotice_base = 'editnotice-' . $this->mNamespace;
			// Optional notice for the entire namespace
			$messages = [ $editnotice_base => 'namespace' ];

			if (
			MediaWikiServices::getInstance()->getNamespaceInfo()->
			hasSubpages( $this->mNamespace )
			) {
			// Optional notice for page itself and any parent page
			foreach ( explode( '/', $this->mDbkeyform ) as $part ) {
			$editnotice_base .= '-' . $part;
			$messages[$editnotice_base] = 'base';
			}
			} else {
			// Even if there are no subpages in namespace, we still don't want "/" in MediaWiki message keys
			$messages[$editnotice_base . '-' . strtr( $this->mDbkeyform, '/', '-' )] = 'page';
			}

			foreach ( $messages as $editnoticeText => $class ) {
			// The following messages are used here:
			// * editnotice-0
			// * editnotice-0-Title
			// * editnotice-0-Title-Subpage
			// * editnotice-…
			$msg = wfMessage( $editnoticeText )->page( $this );
			if ( $msg->exists() ) {
			$html = $msg->parseAsBlock();
			// Edit notices may have complex logic, but output nothing (T91715)
			if ( trim( $html ) !== '' ) {
			$notices[$editnoticeText] = Html::rawElement(
			'div',
			[ 'class' => [
			'mw-editnotice',
			// The following classes are used here:
			// * mw-editnotice-namespace
			// * mw-editnotice-base
			// * mw-editnotice-page
			"mw-editnotice-$class",
			// The following classes are used here:
			// * mw-editnotice-0
			// * mw-editnotice-…
			Sanitizer::escapeClass( "mw-$editnoticeText" )
			] ],
			$html
			);
			}
			}
			}

			( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )
			->onTitleGetEditNotices( $this, $oldid, $notices );
			return $notices;
			}

			/**
			* @param string $field
			* @param int $flags Bitfield of IDBAccessObject::READ_* constants
			* @return string\|false
			*/
			private function getFieldFromPageStore( $field, $flags ) {
			$pageStore = MediaWikiServices::getInstance()->getPageStore();

			if ( !in_array( $field, $pageStore->getSelectFields(), true ) ) {
			throw new InvalidArgumentException( "Unknown field: $field" );
			}

			if ( $flags === IDBAccessObject::READ_NORMAL && $this->mArticleID === 0 ) {
			// page does not exist
			return false;
			}

			if ( !$this->canExist() ) {
			return false;
			}

			$page = $pageStore->getPageByReference( $this, $flags );

			if ( $page instanceof PageStoreRecord ) {
			return $page->getField( $field );
			} else {
			// The page record failed to load, remember the page as non-existing.
			// Note that this can happen even if a page ID was known before under some
			// rare circumstances, if this method is called with the READ_LATEST bit set
			// and the page has been deleted since the ID had initially been determined.
			$this->mArticleID = 0;
			return false;
			}
			}

			/**
			* @return array
			*/
			public function __sleep() {
			return [
			'mNamespace',
			'mDbkeyform',
			'mFragment',
			'mInterwiki',
			'mLocalInterwiki',
			];
			}

			public function __wakeup() {
			$this->mArticleID = ( $this->mNamespace >= 0 ) ? -1 : 0;
			$this->mUrlform = wfUrlencode( $this->mDbkeyform );
			$this->mTextform = strtr( $this->mDbkeyform, '_', ' ' );
			}

			public function __clone() {
			$this->mInstanceCacheKey = null;
			}

			/**
			* Returns false to indicate that this Title belongs to the local wiki.
			*
			* @note The behavior of this method is considered undefined for interwiki links.
			* At the moment, this method always returns false. But this may change in the future.
			*
			* @since 1.36
			* @return string\|false Always self::LOCAL
			*/
			public function getWikiId() {
			return self::LOCAL;
			}

			/**
			* Returns the page ID.
			*
			* If this ID is 0, this means the page does not exist.
			*
			* @see getArticleID()
			* @since 1.36, since 1.35.6 as an alias of getArticleID()
			*
			* @param string\|false $wikiId The wiki ID expected by the caller.
			*
			* @throws PreconditionException if this Title instance does not represent a proper page,
			* that is, if it is a section link, interwiki link, link to a special page, or such.
			* @throws PreconditionException if $wikiId is not false.
			*
			* @return int
			*/
			public function getId( $wikiId = self::LOCAL ): int {
			$this->assertWiki( $wikiId );
			$this->assertProperPage();
			return $this->getArticleID();
			}

			/**
			* Code that requires this Title to be a "proper page" in the sense
			* defined by PageIdentity should call this method.
			*
			* For the purpose of the Title class, a proper page is one that can
			* exist in the page table. That is, a Title represents a proper page
			* if canExist() returns true.
			*
			* @see canExist()
			*
			* @throws PreconditionException
			*/
			private function assertProperPage() {
			Assert::precondition(
			$this->canExist(),
			'This Title instance does not represent a proper page, but merely a link target.'
			);
			}

			/**
			* Returns the page represented by this Title as a ProperPageIdentity.
			* The ProperPageIdentity returned by this method is guaranteed to be immutable.
			* If this Title does not represent a proper page, an exception is thrown.
			*
			* It is preferred to use this method rather than using the Title as a PageIdentity directly.
			*
			* @return ProperPageIdentity
			* @throws PreconditionException if the page is not a proper page, that is, if it is a section
			* link, interwiki link, link to a special page, or such.
			* @since 1.36
			*/
			public function toPageIdentity(): ProperPageIdentity {
			// TODO: replace individual member fields with a PageIdentityValue that is always present

			$this->assertProperPage();

			return new PageIdentityValue(
			$this->getId(),
			$this->getNamespace(),
			$this->getDBkey(),
			$this->getWikiId()
			);
			}

			/**
			* Returns the page represented by this Title as a ProperPageRecord.
			* The PageRecord returned by this method is guaranteed to be immutable,
			* the page is guaranteed to exist.
			*
			* @note For now, this method queries the database on every call.
			* @since 1.36
			*
			* @param int $flags A bitfield of IDBAccessObject::READ_* constants
			*
			* @return ExistingPageRecord
			* @throws PreconditionException if the page does not exist, or is not a proper page,
			* that is, if it is a section link, interwiki link, link to a special page, or such.
			*/
			public function toPageRecord( $flags = 0 ): ExistingPageRecord {
			// TODO: Cache this? Construct is more efficiently?

			$this->assertProperPage();

			Assert::precondition(
			$this->exists( $flags ),
			'This Title instance does not represent an existing page: ' . $this
			);

			return new PageStoreRecord(
			(object)[
			'page_id' => $this->getArticleID( $flags ),
			'page_namespace' => $this->getNamespace(),
			'page_title' => $this->getDBkey(),
			'page_wiki_id' => $this->getWikiId(),
			'page_latest' => $this->getLatestRevID( $flags ),
			'page_is_new' => $this->isNewPage( $flags ),
			'page_is_redirect' => $this->isRedirect( $flags ),
			'page_touched' => $this->getTouched( $flags ),
			'page_lang' => $this->getDbPageLanguageCode( $flags ),
			],
			PageIdentity::LOCAL
			);
			}

			}

mediawiki/includes/title/Title.php00e2a2f7df4cREL1_44

Title.phpView Options

mediawiki/includes/title/Title.php
00e2a2f7df4cREL1_44

Title.php
View Options