includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  */
   6
   7 /** */
   8 require_once( 'normal/UtfNormal.php' );
   9
  10 define ( 'GAID_FOR_UPDATE', 1 );
  11
  12 # Title::newFromTitle maintains a cache to avoid
  13 # expensive re-normalization of commonly used titles.
  14 # On a batch operation this can become a memory leak
  15 # if not bounded. After hitting this many titles,
  16 # reset the cache.
  17 define( 'MW_TITLECACHE_MAX', 1000 );
  18
  19 # Constants for pr_cascade bitfield
  20 define( 'CASCADE', 1 );
  21
  22 /**
  23  * Title class
  24  * - Represents a title, which may contain an interwiki designation or namespace
  25  * - Can fetch various kinds of data from the database, albeit inefficiently.
  26  *
  27  */
  28 class Title {
  29         /**
  30          * Static cache variables
  31          */
  32         static private $titleCache=array();
  33         static private $interwikiCache=array();
  34
  35
  36         /**
  37          * All member variables should be considered private
  38          * Please use the accessor functions
  39          */
  40
  41          /**#@+
  42          * @private
  43          */
  44
  45         var $mTextform;                 # Text form (spaces not underscores) of the main part
  46         var $mUrlform;                  # URL-encoded form of the main part
  47         var $mDbkeyform;                # Main part with underscores
  48         var $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  49         var $mInterwiki;                # Interwiki prefix (or null string)
  50         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  51         var $mArticleID;                # Article ID, fetched from the link cache on demand
  52         var $mLatestID;                 # ID of most recent revision
  53         var $mRestrictions;             # Array of groups allowed to edit this article
  54         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  55         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  56         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  57         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  58         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  59         var $mDefaultNamespace;         # Namespace index when there is no namespace
  60                                         # Zero except in {{transclusion}} tags
  61         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  62         /**#@-*/
  63
  64
  65         /**
  66          * Constructor
  67          * @private
  68          */
  69         /* private */ function __construct() {
  70                 $this->mInterwiki = $this->mUrlform =
  71                 $this->mTextform = $this->mDbkeyform = '';
  72                 $this->mArticleID = -1;
  73                 $this->mNamespace = NS_MAIN;
  74                 $this->mRestrictionsLoaded = false;
  75                 $this->mRestrictions = array();
  76                 # Dont change the following, NS_MAIN is hardcoded in several place
  77                 # See bug #696
  78                 $this->mDefaultNamespace = NS_MAIN;
  79                 $this->mWatched = NULL;
  80                 $this->mLatestID = false;
  81                 $this->mOldRestrictions = false;
  82         }
  83
  84         /**
  85          * Create a new Title from a prefixed DB key
  86          * @param string $key The database key, which has underscores
  87          *      instead of spaces, possibly including namespace and
  88          *      interwiki prefixes
  89          * @return Title the new object, or NULL on an error
  90          * @static
  91          * @access public
  92          */
  93         /* static */ function newFromDBkey( $key ) {
  94                 $t = new Title();
  95                 $t->mDbkeyform = $key;
  96                 if( $t->secureAndSplit() )
  97                         return $t;
  98                 else
  99                         return NULL;
 100         }
 101
 102         /**
 103          * Create a new Title from text, such as what one would
 104          * find in a link. Decodes any HTML entities in the text.
 105          *
 106          * @param string $text the link text; spaces, prefixes,
 107          *      and an initial ':' indicating the main namespace
 108          *      are accepted
 109          * @param int $defaultNamespace the namespace to use if
 110          *      none is specified by a prefix
 111          * @return Title the new object, or NULL on an error
 112          * @static
 113          * @access public
 114          */
 115         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 116                 if( is_object( $text ) ) {
 117                         throw new MWException( 'Title::newFromText given an object' );
 118                 }
 119
 120                 /**
 121                  * Wiki pages often contain multiple links to the same page.
 122                  * Title normalization and parsing can become expensive on
 123                  * pages with many links, so we can save a little time by
 124                  * caching them.
 125                  *
 126                  * In theory these are value objects and won't get changed...
 127                  */
 128                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 129                         return Title::$titleCache[$text];
 130                 }
 131
 132                 /**
 133                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 134                  */
 135                 $filteredText = Sanitizer::decodeCharReferences( $text );
 136
 137                 $t = new Title();
 138                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 139                 $t->mDefaultNamespace = $defaultNamespace;
 140
 141                 static $cachedcount = 0 ;
 142                 if( $t->secureAndSplit() ) {
 143                         if( $defaultNamespace == NS_MAIN ) {
 144                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 145                                         # Avoid memory leaks on mass operations...
 146                                         Title::$titleCache = array();
 147                                         $cachedcount=0;
 148                                 }
 149                                 $cachedcount++;
 150                                 Title::$titleCache[$text] =& $t;
 151                         }
 152                         return $t;
 153                 } else {
 154                         $ret = NULL;
 155                         return $ret;
 156                 }
 157         }
 158
 159         /**
 160          * Create a new Title from URL-encoded text. Ensures that
 161          * the given title's length does not exceed the maximum.
 162          * @param string $url the title, as might be taken from a URL
 163          * @return Title the new object, or NULL on an error
 164          * @static
 165          * @access public
 166          */
 167         public static function newFromURL( $url ) {
 168                 global $wgLegalTitleChars;
 169                 $t = new Title();
 170
 171                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 172                 # but some URLs used it as a space replacement and they still come
 173                 # from some external search tools.
 174                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 175                         $url = str_replace( '+', ' ', $url );
 176                 }
 177
 178                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 179                 if( $t->secureAndSplit() ) {
 180                         return $t;
 181                 } else {
 182                         return NULL;
 183                 }
 184         }
 185
 186         /**
 187          * Create a new Title from an article ID
 188          *
 189          * @todo This is inefficiently implemented, the page row is requested
 190          *       but not used for anything else
 191          *
 192          * @param int $id the page_id corresponding to the Title to create
 193          * @return Title the new object, or NULL on an error
 194          * @access public
 195          * @static
 196          */
 197         public static function newFromID( $id ) {
 198                 $fname = 'Title::newFromID';
 199                 $dbr =& wfGetDB( DB_SLAVE );
 200                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 201                         array( 'page_id' => $id ), $fname );
 202                 if ( $row !== false ) {
 203                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 204                 } else {
 205                         $title = NULL;
 206                 }
 207                 return $title;
 208         }
 209
 210         /**
 211          * Make an array of titles from an array of IDs
 212          */
 213         function newFromIDs( $ids ) {
 214                 $dbr =& wfGetDB( DB_SLAVE );
 215                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 216                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 217
 218                 $titles = array();
 219                 while ( $row = $dbr->fetchObject( $res ) ) {
 220                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 221                 }
 222                 return $titles;
 223         }
 224
 225         /**
 226          * Create a new Title from a namespace index and a DB key.
 227          * It's assumed that $ns and $title are *valid*, for instance when
 228          * they came directly from the database or a special page name.
 229          * For convenience, spaces are converted to underscores so that
 230          * eg user_text fields can be used directly.
 231          *
 232          * @param int $ns the namespace of the article
 233          * @param string $title the unprefixed database key form
 234          * @return Title the new object
 235          * @static
 236          * @access public
 237          */
 238         public static function &makeTitle( $ns, $title ) {
 239                 $t = new Title();
 240                 $t->mInterwiki = '';
 241                 $t->mFragment = '';
 242                 $t->mNamespace = intval( $ns );
 243                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 244                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 245                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 246                 $t->mTextform = str_replace( '_', ' ', $title );
 247                 return $t;
 248         }
 249
 250         /**
 251          * Create a new Title from a namespace index and a DB key.
 252          * The parameters will be checked for validity, which is a bit slower
 253          * than makeTitle() but safer for user-provided data.
 254          *
 255          * @param int $ns the namespace of the article
 256          * @param string $title the database key form
 257          * @return Title the new object, or NULL on an error
 258          * @static
 259          * @access public
 260          */
 261         public static function makeTitleSafe( $ns, $title ) {
 262                 $t = new Title();
 263                 $t->mDbkeyform = Title::makeName( $ns, $title );
 264                 if( $t->secureAndSplit() ) {
 265                         return $t;
 266                 } else {
 267                         return NULL;
 268                 }
 269         }
 270
 271         /**
 272          * Create a new Title for the Main Page
 273          *
 274          * @static
 275          * @return Title the new object
 276          * @access public
 277          */
 278         public static function newMainPage() {
 279                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 280         }
 281
 282         /**
 283          * Create a new Title for a redirect
 284          * @param string $text the redirect title text
 285          * @return Title the new object, or NULL if the text is not a
 286          *      valid redirect
 287          */
 288         public static function newFromRedirect( $text ) {
 289                 $mwRedir = MagicWord::get( 'redirect' );
 290                 $rt = NULL;
 291                 if ( $mwRedir->matchStart( $text ) ) {
 292                         $m = array();
 293                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 294                                 # categories are escaped using : for example one can enter:
 295                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 296                                 if ( substr($m[1],0,1) == ':') {
 297                                         # We don't want to keep the ':'
 298                                         $m[1] = substr( $m[1], 1 );
 299                                 }
 300
 301                                 $rt = Title::newFromText( $m[1] );
 302                                 # Disallow redirects to Special:Userlogout
 303                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 304                                         $rt = NULL;
 305                                 }
 306                         }
 307                 }
 308                 return $rt;
 309         }
 310
 311 #----------------------------------------------------------------------------
 312 #       Static functions
 313 #----------------------------------------------------------------------------
 314
 315         /**
 316          * Get the prefixed DB key associated with an ID
 317          * @param int $id the page_id of the article
 318          * @return Title an object representing the article, or NULL
 319          *      if no such article was found
 320          * @static
 321          * @access public
 322          */
 323         function nameOf( $id ) {
 324                 $fname = 'Title::nameOf';
 325                 $dbr =& wfGetDB( DB_SLAVE );
 326
 327                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 328                 if ( $s === false ) { return NULL; }
 329
 330                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 331                 return $n;
 332         }
 333
 334         /**
 335          * Get a regex character class describing the legal characters in a link
 336          * @return string the list of characters, not delimited
 337          * @static
 338          * @access public
 339          */
 340         public static function legalChars() {
 341                 global $wgLegalTitleChars;
 342                 return $wgLegalTitleChars;
 343         }
 344
 345         /**
 346          * Get a string representation of a title suitable for
 347          * including in a search index
 348          *
 349          * @param int $ns a namespace index
 350          * @param string $title text-form main part
 351          * @return string a stripped-down title string ready for the
 352          *      search index
 353          */
 354         public static function indexTitle( $ns, $title ) {
 355                 global $wgContLang;
 356
 357                 $lc = SearchEngine::legalSearchChars() . '&#;';
 358                 $t = $wgContLang->stripForSearch( $title );
 359                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 360                 $t = $wgContLang->lc( $t );
 361
 362                 # Handle 's, s'
 363                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 364                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 365
 366                 $t = preg_replace( "/\\s+/", ' ', $t );
 367
 368                 if ( $ns == NS_IMAGE ) {
 369                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 370                 }
 371                 return trim( $t );
 372         }
 373
 374         /*
 375          * Make a prefixed DB key from a DB key and a namespace index
 376          * @param int $ns numerical representation of the namespace
 377          * @param string $title the DB key form the title
 378          * @return string the prefixed form of the title
 379          */
 380         public static function makeName( $ns, $title ) {
 381                 global $wgContLang;
 382
 383                 $n = $wgContLang->getNsText( $ns );
 384                 return $n == '' ? $title : "$n:$title";
 385         }
 386
 387         /**
 388          * Returns the URL associated with an interwiki prefix
 389          * @param string $key the interwiki prefix (e.g. "MeatBall")
 390          * @return the associated URL, containing "$1", which should be
 391          *      replaced by an article title
 392          * @static (arguably)
 393          * @access public
 394          */
 395         function getInterwikiLink( $key )  {
 396                 global $wgMemc, $wgInterwikiExpiry;
 397                 global $wgInterwikiCache, $wgContLang;
 398                 $fname = 'Title::getInterwikiLink';
 399
 400                 $key = $wgContLang->lc( $key );
 401
 402                 $k = wfMemcKey( 'interwiki', $key );
 403                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 404                         return Title::$interwikiCache[$k]->iw_url;
 405                 }
 406
 407                 if ($wgInterwikiCache) {
 408                         return Title::getInterwikiCached( $key );
 409                 }
 410
 411                 $s = $wgMemc->get( $k );
 412                 # Ignore old keys with no iw_local
 413                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 414                         Title::$interwikiCache[$k] = $s;
 415                         return $s->iw_url;
 416                 }
 417
 418                 $dbr =& wfGetDB( DB_SLAVE );
 419                 $res = $dbr->select( 'interwiki',
 420                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 421                         array( 'iw_prefix' => $key ), $fname );
 422                 if( !$res ) {
 423                         return '';
 424                 }
 425
 426                 $s = $dbr->fetchObject( $res );
 427                 if( !$s ) {
 428                         # Cache non-existence: create a blank object and save it to memcached
 429                         $s = (object)false;
 430                         $s->iw_url = '';
 431                         $s->iw_local = 0;
 432                         $s->iw_trans = 0;
 433                 }
 434                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 435                 Title::$interwikiCache[$k] = $s;
 436
 437                 return $s->iw_url;
 438         }
 439
 440         /**
 441          * Fetch interwiki prefix data from local cache in constant database
 442          *
 443          * More logic is explained in DefaultSettings
 444          *
 445          * @return string URL of interwiki site
 446          * @access public
 447          */
 448         function getInterwikiCached( $key ) {
 449                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 450                 static $db, $site;
 451
 452                 if (!$db)
 453                         $db=dba_open($wgInterwikiCache,'r','cdb');
 454                 /* Resolve site name */
 455                 if ($wgInterwikiScopes>=3 and !$site) {
 456                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 457                         if ($site=="")
 458                                 $site = $wgInterwikiFallbackSite;
 459                 }
 460                 $value = dba_fetch( wfMemcKey( $key ), $db);
 461                 if ($value=='' and $wgInterwikiScopes>=3) {
 462                         /* try site-level */
 463                         $value = dba_fetch("_{$site}:{$key}", $db);
 464                 }
 465                 if ($value=='' and $wgInterwikiScopes>=2) {
 466                         /* try globals */
 467                         $value = dba_fetch("__global:{$key}", $db);
 468                 }
 469                 if ($value=='undef')
 470                         $value='';
 471                 $s = (object)false;
 472                 $s->iw_url = '';
 473                 $s->iw_local = 0;
 474                 $s->iw_trans = 0;
 475                 if ($value!='') {
 476                         list($local,$url)=explode(' ',$value,2);
 477                         $s->iw_url=$url;
 478                         $s->iw_local=(int)$local;
 479                 }
 480                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 481                 return $s->iw_url;
 482         }
 483         /**
 484          * Determine whether the object refers to a page within
 485          * this project.
 486          *
 487          * @return bool TRUE if this is an in-project interwiki link
 488          *      or a wikilink, FALSE otherwise
 489          * @access public
 490          */
 491         function isLocal() {
 492                 if ( $this->mInterwiki != '' ) {
 493                         # Make sure key is loaded into cache
 494                         $this->getInterwikiLink( $this->mInterwiki );
 495                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 496                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 497                 } else {
 498                         return true;
 499                 }
 500         }
 501
 502         /**
 503          * Determine whether the object refers to a page within
 504          * this project and is transcludable.
 505          *
 506          * @return bool TRUE if this is transcludable
 507          * @access public
 508          */
 509         function isTrans() {
 510                 if ($this->mInterwiki == '')
 511                         return false;
 512                 # Make sure key is loaded into cache
 513                 $this->getInterwikiLink( $this->mInterwiki );
 514                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 515                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 516         }
 517
 518         /**
 519          * Update the page_touched field for an array of title objects
 520          * @todo Inefficient unless the IDs are already loaded into the
 521          *      link cache
 522          * @param array $titles an array of Title objects to be touched
 523          * @param string $timestamp the timestamp to use instead of the
 524          *      default current time
 525          * @static
 526          * @access public
 527          */
 528         function touchArray( $titles, $timestamp = '' ) {
 529
 530                 if ( count( $titles ) == 0 ) {
 531                         return;
 532                 }
 533                 $dbw =& wfGetDB( DB_MASTER );
 534                 if ( $timestamp == '' ) {
 535                         $timestamp = $dbw->timestamp();
 536                 }
 537                 /*
 538                 $page = $dbw->tableName( 'page' );
 539                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 540                 $first = true;
 541
 542                 foreach ( $titles as $title ) {
 543                         if ( $wgUseFileCache ) {
 544                                 $cm = new HTMLFileCache($title);
 545                                 @unlink($cm->fileCacheName());
 546                         }
 547
 548                         if ( ! $first ) {
 549                                 $sql .= ',';
 550                         }
 551                         $first = false;
 552                         $sql .= $title->getArticleID();
 553                 }
 554                 $sql .= ')';
 555                 if ( ! $first ) {
 556                         $dbw->query( $sql, 'Title::touchArray' );
 557                 }
 558                 */
 559                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 560                 // do them in small chunks:
 561                 $fname = 'Title::touchArray';
 562                 foreach( $titles as $title ) {
 563                         $dbw->update( 'page',
 564                                 array( 'page_touched' => $timestamp ),
 565                                 array(
 566                                         'page_namespace' => $title->getNamespace(),
 567                                         'page_title'     => $title->getDBkey() ),
 568                                 $fname );
 569                 }
 570         }
 571
 572         /**
 573          * Escape a text fragment, say from a link, for a URL
 574          */
 575         static function escapeFragmentForURL( $fragment ) {
 576                 $fragment = str_replace( ' ', '_', $fragment );
 577                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 578                 $replaceArray = array(
 579                         '%3A' => ':',
 580                         '%' => '.'
 581                 );
 582                 return strtr( $fragment, $replaceArray );
 583         }
 584
 585 #----------------------------------------------------------------------------
 586 #       Other stuff
 587 #----------------------------------------------------------------------------
 588
 589         /** Simple accessors */
 590         /**
 591          * Get the text form (spaces not underscores) of the main part
 592          * @return string
 593          * @access public
 594          */
 595         function getText() { return $this->mTextform; }
 596         /**
 597          * Get the URL-encoded form of the main part
 598          * @return string
 599          * @access public
 600          */
 601         function getPartialURL() { return $this->mUrlform; }
 602         /**
 603          * Get the main part with underscores
 604          * @return string
 605          * @access public
 606          */
 607         function getDBkey() { return $this->mDbkeyform; }
 608         /**
 609          * Get the namespace index, i.e. one of the NS_xxxx constants
 610          * @return int
 611          * @access public
 612          */
 613         function getNamespace() { return $this->mNamespace; }
 614         /**
 615          * Get the namespace text
 616          * @return string
 617          * @access public
 618          */
 619         function getNsText() {
 620                 global $wgContLang, $wgCanonicalNamespaceNames;
 621
 622                 if ( '' != $this->mInterwiki ) {
 623                         // This probably shouldn't even happen. ohh man, oh yuck.
 624                         // But for interwiki transclusion it sometimes does.
 625                         // Shit. Shit shit shit.
 626                         //
 627                         // Use the canonical namespaces if possible to try to
 628                         // resolve a foreign namespace.
 629                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 630                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 631                         }
 632                 }
 633                 return $wgContLang->getNsText( $this->mNamespace );
 634         }
 635         /**
 636          * Get the namespace text of the subject (rather than talk) page
 637          * @return string
 638          * @access public
 639          */
 640         function getSubjectNsText() {
 641                 global $wgContLang;
 642                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 643         }
 644
 645         /**
 646          * Get the namespace text of the talk page
 647          * @return string
 648          */
 649         function getTalkNsText() {
 650                 global $wgContLang;
 651                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 652         }
 653
 654         /**
 655          * Could this title have a corresponding talk page?
 656          * @return bool
 657          */
 658         function canTalk() {
 659                 return( Namespace::canTalk( $this->mNamespace ) );
 660         }
 661
 662         /**
 663          * Get the interwiki prefix (or null string)
 664          * @return string
 665          * @access public
 666          */
 667         function getInterwiki() { return $this->mInterwiki; }
 668         /**
 669          * Get the Title fragment (i.e. the bit after the #) in text form
 670          * @return string
 671          * @access public
 672          */
 673         function getFragment() { return $this->mFragment; }
 674         /**
 675          * Get the fragment in URL form, including the "#" character if there is one
 676          *
 677          * @return string
 678          * @access public
 679          */
 680         function getFragmentForURL() {
 681                 if ( $this->mFragment == '' ) {
 682                         return '';
 683                 } else {
 684                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 685                 }
 686         }
 687         /**
 688          * Get the default namespace index, for when there is no namespace
 689          * @return int
 690          * @access public
 691          */
 692         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 693
 694         /**
 695          * Get title for search index
 696          * @return string a stripped-down title string ready for the
 697          *      search index
 698          */
 699         function getIndexTitle() {
 700                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 701         }
 702
 703         /**
 704          * Get the prefixed database key form
 705          * @return string the prefixed title, with underscores and
 706          *      any interwiki and namespace prefixes
 707          * @access public
 708          */
 709         function getPrefixedDBkey() {
 710                 $s = $this->prefix( $this->mDbkeyform );
 711                 $s = str_replace( ' ', '_', $s );
 712                 return $s;
 713         }
 714
 715         /**
 716          * Get the prefixed title with spaces.
 717          * This is the form usually used for display
 718          * @return string the prefixed title, with spaces
 719          * @access public
 720          */
 721         function getPrefixedText() {
 722                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 723                         $s = $this->prefix( $this->mTextform );
 724                         $s = str_replace( '_', ' ', $s );
 725                         $this->mPrefixedText = $s;
 726                 }
 727                 return $this->mPrefixedText;
 728         }
 729
 730         /**
 731          * Get the prefixed title with spaces, plus any fragment
 732          * (part beginning with '#')
 733          * @return string the prefixed title, with spaces and
 734          *      the fragment, including '#'
 735          * @access public
 736          */
 737         function getFullText() {
 738                 $text = $this->getPrefixedText();
 739                 if( '' != $this->mFragment ) {
 740                         $text .= '#' . $this->mFragment;
 741                 }
 742                 return $text;
 743         }
 744
 745         /**
 746          * Get the base name, i.e. the leftmost parts before the /
 747          * @return string Base name
 748          */
 749         function getBaseText() {
 750                 global $wgNamespacesWithSubpages;
 751                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 752                         $parts = explode( '/', $this->getText() );
 753                         # Don't discard the real title if there's no subpage involved
 754                         if( count( $parts ) > 1 )
 755                                 unset( $parts[ count( $parts ) - 1 ] );
 756                         return implode( '/', $parts );
 757                 } else {
 758                         return $this->getText();
 759                 }
 760         }
 761
 762         /**
 763          * Get the lowest-level subpage name, i.e. the rightmost part after /
 764          * @return string Subpage name
 765          */
 766         function getSubpageText() {
 767                 global $wgNamespacesWithSubpages;
 768                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 769                         $parts = explode( '/', $this->mTextform );
 770                         return( $parts[ count( $parts ) - 1 ] );
 771                 } else {
 772                         return( $this->mTextform );
 773                 }
 774         }
 775
 776         /**
 777          * Get a URL-encoded form of the subpage text
 778          * @return string URL-encoded subpage name
 779          */
 780         function getSubpageUrlForm() {
 781                 $text = $this->getSubpageText();
 782                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 783                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 784                 return( $text );
 785         }
 786
 787         /**
 788          * Get a URL-encoded title (not an actual URL) including interwiki
 789          * @return string the URL-encoded form
 790          * @access public
 791          */
 792         function getPrefixedURL() {
 793                 $s = $this->prefix( $this->mDbkeyform );
 794                 $s = str_replace( ' ', '_', $s );
 795
 796                 $s = wfUrlencode ( $s ) ;
 797
 798                 # Cleaning up URL to make it look nice -- is this safe?
 799                 $s = str_replace( '%28', '(', $s );
 800                 $s = str_replace( '%29', ')', $s );
 801
 802                 return $s;
 803         }
 804
 805         /**
 806          * Get a real URL referring to this title, with interwiki link and
 807          * fragment
 808          *
 809          * @param string $query an optional query string, not used
 810          *      for interwiki links
 811          * @param string $variant language variant of url (for sr, zh..)
 812          * @return string the URL
 813          * @access public
 814          */
 815         function getFullURL( $query = '', $variant = false ) {
 816                 global $wgContLang, $wgServer, $wgRequest;
 817
 818                 if ( '' == $this->mInterwiki ) {
 819                         $url = $this->getLocalUrl( $query, $variant );
 820
 821                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 822                         // Correct fix would be to move the prepending elsewhere.
 823                         if ($wgRequest->getVal('action') != 'render') {
 824                                 $url = $wgServer . $url;
 825                         }
 826                 } else {
 827                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 828
 829                         $namespace = wfUrlencode( $this->getNsText() );
 830                         if ( '' != $namespace ) {
 831                                 # Can this actually happen? Interwikis shouldn't be parsed.
 832                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 833                                 $namespace .= ':';
 834                         }
 835                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 836                         if( $query != '' ) {
 837                                 if( false === strpos( $url, '?' ) ) {
 838                                         $url .= '?';
 839                                 } else {
 840                                         $url .= '&';
 841                                 }
 842                                 $url .= $query;
 843                         }
 844                 }
 845
 846                 # Finally, add the fragment.
 847                 $url .= $this->getFragmentForURL();
 848
 849                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 850                 return $url;
 851         }
 852
 853         /**
 854          * Get a URL with no fragment or server name.  If this page is generated
 855          * with action=render, $wgServer is prepended.
 856          * @param string $query an optional query string; if not specified,
 857          *      $wgArticlePath will be used.
 858          * @param string $variant language variant of url (for sr, zh..)
 859          * @return string the URL
 860          * @access public
 861          */
 862         function getLocalURL( $query = '', $variant = false ) {
 863                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 864                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 865
 866                 // internal links should point to same variant as current page (only anonymous users)
 867                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 868                         $pref = $wgContLang->getPreferredVariant(false);
 869                         if($pref != $wgContLang->getCode())
 870                                 $variant = $pref;
 871                 }
 872
 873                 if ( $this->isExternal() ) {
 874                         $url = $this->getFullURL();
 875                         if ( $query ) {
 876                                 // This is currently only used for edit section links in the
 877                                 // context of interwiki transclusion. In theory we should
 878                                 // append the query to the end of any existing query string,
 879                                 // but interwiki transclusion is already broken in that case.
 880                                 $url .= "?$query";
 881                         }
 882                 } else {
 883                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 884                         if ( $query == '' ) {
 885                                 if($variant!=false && $wgContLang->hasVariants()){
 886                                         if($wgVariantArticlePath==false)
 887                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 888                                         else
 889                                                 $variantArticlePath = $wgVariantArticlePath;
 890
 891                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 892                                         $url = str_replace( '$1', $dbkey, $url  );
 893
 894                                 }
 895                                 else
 896                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 897                         } else {
 898                                 global $wgActionPaths;
 899                                 $url = false;
 900                                 $matches = array();
 901                                 if( !empty( $wgActionPaths ) &&
 902                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 903                                 {
 904                                         $action = urldecode( $matches[2] );
 905                                         if( isset( $wgActionPaths[$action] ) ) {
 906                                                 $query = $matches[1];
 907                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 908                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 909                                                 if( $query != '' ) $url .= '?' . $query;
 910                                         }
 911                                 }
 912                                 if ( $url === false ) {
 913                                         if ( $query == '-' ) {
 914                                                 $query = '';
 915                                         }
 916                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 917                                 }
 918                         }
 919
 920                         // FIXME: this causes breakage in various places when we
 921                         // actually expected a local URL and end up with dupe prefixes.
 922                         if ($wgRequest->getVal('action') == 'render') {
 923                                 $url = $wgServer . $url;
 924                         }
 925                 }
 926                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 927                 return $url;
 928         }
 929
 930         /**
 931          * Get an HTML-escaped version of the URL form, suitable for
 932          * using in a link, without a server name or fragment
 933          * @param string $query an optional query string
 934          * @return string the URL
 935          * @access public
 936          */
 937         function escapeLocalURL( $query = '' ) {
 938                 return htmlspecialchars( $this->getLocalURL( $query ) );
 939         }
 940
 941         /**
 942          * Get an HTML-escaped version of the URL form, suitable for
 943          * using in a link, including the server name and fragment
 944          *
 945          * @return string the URL
 946          * @param string $query an optional query string
 947          * @access public
 948          */
 949         function escapeFullURL( $query = '' ) {
 950                 return htmlspecialchars( $this->getFullURL( $query ) );
 951         }
 952
 953         /**
 954          * Get the URL form for an internal link.
 955          * - Used in various Squid-related code, in case we have a different
 956          * internal hostname for the server from the exposed one.
 957          *
 958          * @param string $query an optional query string
 959          * @param string $variant language variant of url (for sr, zh..)
 960          * @return string the URL
 961          * @access public
 962          */
 963         function getInternalURL( $query = '', $variant = false ) {
 964                 global $wgInternalServer;
 965                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 966                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 967                 return $url;
 968         }
 969
 970         /**
 971          * Get the edit URL for this Title
 972          * @return string the URL, or a null string if this is an
 973          *      interwiki link
 974          * @access public
 975          */
 976         function getEditURL() {
 977                 if ( '' != $this->mInterwiki ) { return ''; }
 978                 $s = $this->getLocalURL( 'action=edit' );
 979
 980                 return $s;
 981         }
 982
 983         /**
 984          * Get the HTML-escaped displayable text form.
 985          * Used for the title field in <a> tags.
 986          * @return string the text, including any prefixes
 987          * @access public
 988          */
 989         function getEscapedText() {
 990                 return htmlspecialchars( $this->getPrefixedText() );
 991         }
 992
 993         /**
 994          * Is this Title interwiki?
 995          * @return boolean
 996          * @access public
 997          */
 998         function isExternal() { return ( '' != $this->mInterwiki ); }
 999
1000         /**
1001          * Is this page "semi-protected" - the *only* protection is autoconfirm?
1002          *
1003          * @param string Action to check (default: edit)
1004          * @return bool
1005          */
1006         function isSemiProtected( $action = 'edit' ) {
1007                 if( $this->exists() ) {
1008                         $restrictions = $this->getRestrictions( $action );
1009                         if( count( $restrictions ) > 0 ) {
1010                                 foreach( $restrictions as $restriction ) {
1011                                         if( strtolower( $restriction ) != 'autoconfirmed' )
1012                                                 return false;
1013                                 }
1014                         } else {
1015                                 # Not protected
1016                                 return false;
1017                         }
1018                         return true;
1019                 } else {
1020                         # If it doesn't exist, it can't be protected
1021                         return false;
1022                 }
1023         }
1024
1025         /**
1026          * Does the title correspond to a protected article?
1027          * @param string $what the action the page is protected from,
1028          *      by default checks move and edit
1029          * @return boolean
1030          * @access public
1031          */
1032         function isProtected( $action = '' ) {
1033                 global $wgRestrictionLevels;
1034
1035                 if ( NS_SPECIAL == $this->mNamespace ) { return true; }
1036
1037                 if ( $this->isCascadeProtected() ) { return true; }
1038
1039                 if( $action == 'edit' || $action == '' ) {
1040                         $r = $this->getRestrictions( 'edit' );
1041                         foreach( $wgRestrictionLevels as $level ) {
1042                                 if( in_array( $level, $r ) && $level != '' ) {
1043                                         return( true );
1044                                 }
1045                         }
1046                 }
1047
1048                 if( $action == 'move' || $action == '' ) {
1049                         $r = $this->getRestrictions( 'move' );
1050                         foreach( $wgRestrictionLevels as $level ) {
1051                                 if( in_array( $level, $r ) && $level != '' ) {
1052                                         return( true );
1053                                 }
1054                         }
1055                 }
1056
1057                 return false;
1058         }
1059
1060         /**
1061          * Is $wgUser is watching this page?
1062          * @return boolean
1063          * @access public
1064          */
1065         function userIsWatching() {
1066                 global $wgUser;
1067
1068                 if ( is_null( $this->mWatched ) ) {
1069                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1070                                 $this->mWatched = false;
1071                         } else {
1072                                 $this->mWatched = $wgUser->isWatched( $this );
1073                         }
1074                 }
1075                 return $this->mWatched;
1076         }
1077
1078         /**
1079          * Can $wgUser perform $action on this page?
1080          * This skips potentially expensive cascading permission checks.
1081          *
1082          * Suitable for use for nonessential UI controls in common cases, but
1083          * _not_ for functional access control.
1084          *
1085          * May provide false positives, but should never provide a false negative.
1086          *
1087          * @param string $action action that permission needs to be checked for
1088          * @return boolean
1089          */
1090         public function quickUserCan( $action ) {
1091                 return $this->userCan( $action, false );
1092         }
1093
1094         /**
1095          * Can $wgUser perform $action on this page?
1096          * @param string $action action that permission needs to be checked for
1097          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1098          * @return boolean
1099          */
1100         public function userCan( $action, $doExpensiveQueries = true ) {
1101                 $fname = 'Title::userCan';
1102                 wfProfileIn( $fname );
1103
1104                 global $wgUser, $wgNamespaceProtection;
1105
1106                 $result = null;
1107                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1108                 if ( $result !== null ) {
1109                         wfProfileOut( $fname );
1110                         return $result;
1111                 }
1112
1113                 if( NS_SPECIAL == $this->mNamespace ) {
1114                         wfProfileOut( $fname );
1115                         return false;
1116                 }
1117
1118                 if ( array_key_exists( $this->mNamespace, $wgNamespaceProtection ) ) {
1119                         $nsProt = $wgNamespaceProtection[ $this->mNamespace ];
1120                         if ( !is_array($nsProt) ) $nsProt = array($nsProt);
1121                         foreach( $nsProt as $right ) {
1122                                 if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1123                                         wfProfileOut( $fname );
1124                                         return false;
1125                                 }
1126                         }
1127                 }
1128
1129                 if( $this->mDbkeyform == '_' ) {
1130                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1131                         wfProfileOut( $fname );
1132                         return false;
1133                 }
1134
1135                 # protect css/js subpages of user pages
1136                 # XXX: this might be better using restrictions
1137                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1138                 if( $this->isCssJsSubpage()
1139                         && !$wgUser->isAllowed('editinterface')
1140                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1141                         wfProfileOut( $fname );
1142                         return false;
1143                 }
1144
1145                 if ( $doExpensiveQueries && $this->isCascadeProtected() ) {
1146                         # We /could/ use the protection level on the source page, but it's fairly ugly
1147                         #  as we have to establish a precedence hierarchy for pages included by multiple
1148                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1149                         #  as they could remove the protection anyway.
1150                         if ( !$wgUser->isAllowed('protect') ) {
1151                                 wfProfileOut( $fname );
1152                                 return false;
1153                         }
1154                 }
1155
1156                 foreach( $this->getRestrictions($action) as $right ) {
1157                         // Backwards compatibility, rewrite sysop -> protect
1158                         if ( $right == 'sysop' ) {
1159                                 $right = 'protect';
1160                         }
1161                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1162                                 wfProfileOut( $fname );
1163                                 return false;
1164                         }
1165                 }
1166
1167                 if( $action == 'move' &&
1168                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1169                         wfProfileOut( $fname );
1170                         return false;
1171                 }
1172
1173                 if( $action == 'create' ) {
1174                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1175                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1176                                 wfProfileOut( $fname );
1177                                 return false;
1178                         }
1179                 }
1180
1181                 wfProfileOut( $fname );
1182                 return true;
1183         }
1184
1185         /**
1186          * Can $wgUser edit this page?
1187          * @return boolean
1188          * @deprecated use userCan('edit')
1189          */
1190         public function userCanEdit( $doExpensiveQueries = true ) {
1191                 return $this->userCan( 'edit', $doExpensiveQueries );
1192         }
1193
1194         /**
1195          * Can $wgUser create this page?
1196          * @return boolean
1197          * @deprecated use userCan('create')
1198          */
1199         public function userCanCreate( $doExpensiveQueries = true ) {
1200                 return $this->userCan( 'create', $doExpensiveQueries );
1201         }
1202
1203         /**
1204          * Can $wgUser move this page?
1205          * @return boolean
1206          * @deprecated use userCan('move')
1207          */
1208         public function userCanMove( $doExpensiveQueries = true ) {
1209                 return $this->userCan( 'move', $doExpensiveQueries );
1210         }
1211
1212         /**
1213          * Would anybody with sufficient privileges be able to move this page?
1214          * Some pages just aren't movable.
1215          *
1216          * @return boolean
1217          * @access public
1218          */
1219         function isMovable() {
1220                 return Namespace::isMovable( $this->getNamespace() )
1221                         && $this->getInterwiki() == '';
1222         }
1223
1224         /**
1225          * Can $wgUser read this page?
1226          * @return boolean
1227          * @fixme fold these checks into userCan()
1228          */
1229         public function userCanRead() {
1230                 global $wgUser;
1231
1232                 $result = null;
1233                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1234                 if ( $result !== null ) {
1235                         return $result;
1236                 }
1237
1238                 if( $wgUser->isAllowed('read') ) {
1239                         return true;
1240                 } else {
1241                         global $wgWhitelistRead;
1242
1243                         /**
1244                          * Always grant access to the login page.
1245                          * Even anons need to be able to log in.
1246                         */
1247                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1248                                 return true;
1249                         }
1250
1251                         /** some pages are explicitly allowed */
1252                         $name = $this->getPrefixedText();
1253                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1254                                 return true;
1255                         }
1256
1257                         # Compatibility with old settings
1258                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1259                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1260                                         return true;
1261                                 }
1262                         }
1263                 }
1264                 return false;
1265         }
1266
1267         /**
1268          * Is this a talk page of some sort?
1269          * @return bool
1270          * @access public
1271          */
1272         function isTalkPage() {
1273                 return Namespace::isTalk( $this->getNamespace() );
1274         }
1275
1276         /**
1277          * Is this a subpage?
1278          * @return bool
1279          * @access public
1280          */
1281         function isSubpage() {
1282                 global $wgNamespacesWithSubpages;
1283
1284                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1285                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1286                 } else {
1287                         return false;
1288                 }
1289         }
1290
1291         /**
1292          * Is this a .css or .js subpage of a user page?
1293          * @return bool
1294          * @access public
1295          */
1296         function isCssJsSubpage() {
1297                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(css|js)$/", $this->mTextform ) );
1298         }
1299         /**
1300          * Is this a *valid* .css or .js subpage of a user page?
1301          * Check that the corresponding skin exists
1302          */
1303         function isValidCssJsSubpage() {
1304                 if ( $this->isCssJsSubpage() ) {
1305                         $skinNames = Skin::getSkinNames();
1306                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1307                 } else {
1308                         return false;
1309                 }
1310         }
1311         /**
1312          * Trim down a .css or .js subpage title to get the corresponding skin name
1313          */
1314         function getSkinFromCssJsSubpage() {
1315                 $subpage = explode( '/', $this->mTextform );
1316                 $subpage = $subpage[ count( $subpage ) - 1 ];
1317                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1318         }
1319         /**
1320          * Is this a .css subpage of a user page?
1321          * @return bool
1322          * @access public
1323          */
1324         function isCssSubpage() {
1325                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1326         }
1327         /**
1328          * Is this a .js subpage of a user page?
1329          * @return bool
1330          * @access public
1331          */
1332         function isJsSubpage() {
1333                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1334         }
1335         /**
1336          * Protect css/js subpages of user pages: can $wgUser edit
1337          * this page?
1338          *
1339          * @return boolean
1340          * @todo XXX: this might be better using restrictions
1341          * @access public
1342          */
1343         function userCanEditCssJsSubpage() {
1344                 global $wgUser;
1345                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1346         }
1347
1348         /**
1349          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1350          *
1351          * @return bool If the page is subject to cascading restrictions.
1352          * @access public.
1353          */
1354         function isCascadeProtected() {
1355                 return ( $this->getCascadeProtectionSources( false ) );
1356         }
1357
1358         /**
1359          * Cascading protection: Get the source of any cascading restrictions on this page.
1360          *
1361          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1362          * @return mixed Array of the Title objects of the pages from which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1363          * @access public
1364          */
1365         function getCascadeProtectionSources( $get_pages = true ) {
1366                 global $wgEnableCascadingProtection;
1367                 if (!$wgEnableCascadingProtection)
1368                         return false;
1369
1370                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1371                         return $this->mCascadeSources;
1372                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1373                         return $this->mHasCascadingRestrictions;
1374                 }
1375
1376                 wfProfileIn( __METHOD__ );
1377
1378                 $dbr =& wfGetDb( DB_SLAVE );
1379
1380                 if ( $this->getNamespace() == NS_IMAGE ) {
1381                         $cols = $get_pages ? array('pr_page', 'page_namespace', 'page_title') : array( '1' );
1382                         $tables = array ('imagelinks', 'page_restrictions');
1383                         $where_clauses = array( 'il_to' => $this->getDBkey(), 'il_from=pr_page', 'pr_cascade' => 1 );
1384                 } else {
1385                         $cols = $get_pages ? array( 'pr_page', 'page_namespace', 'page_title' ) : array( '1' );
1386                         $tables = array ('templatelinks', 'page_restrictions');
1387                         $where_clauses = array( 'tl_namespace' => $this->getNamespace(), 'tl_title' => $this->getDBkey(), 'tl_from=pr_page', 'pr_cascade' => 1 );
1388                 }
1389
1390                 $options = array ();
1391
1392                 if ( $get_pages ) {
1393                         $where_clauses[] = 'page_id=pr_page';
1394                         $tables[] = 'page';
1395                 } else {
1396                         $options[] = "LIMIT 1";
1397                 }
1398
1399                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__, $options);
1400
1401                 if ($dbr->numRows($res)) {
1402                         if ($get_pages) {
1403                                 $sources = array ();
1404                                 while ($row = $dbr->fetchObject($res)) {
1405                                         $page_id = $row->pr_page;
1406                                         $page_ns = $row->page_namespace;
1407                                         $page_title = $row->page_title;
1408                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1409                                 }
1410                         } else {
1411                                 $sources = true;
1412                         }
1413                 } else {
1414                         $sources = false;
1415                 }
1416
1417                 wfProfileOut( __METHOD__ );
1418
1419                 if ( $get_pages ) {
1420                         $this->mCascadeSources = $sources;
1421                 } else {
1422                         $this->mHasCascadingRestrictions = $sources;
1423                 }
1424
1425                 return $sources;
1426         }
1427
1428         function areRestrictionsCascading() {
1429                 if (!$this->mRestrictionsLoaded) {
1430                         $this->loadRestrictions();
1431                 }
1432
1433                 return $this->mCascadeRestriction;
1434         }
1435
1436         /**
1437          * Loads a string into mRestrictions array
1438          * @param resource $res restrictions as an SQL result.
1439          * @access public
1440          */
1441         function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1442                 $dbr =& wfGetDb( DB_SLAVE );
1443
1444                 $this->mRestrictions['edit'] = array();
1445                 $this->mRestrictions['move'] = array();
1446
1447                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1448
1449                 if ( $oldFashionedRestrictions == NULL ) {
1450                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1451                 }
1452
1453                 if ($oldFashionedRestrictions != '') {
1454
1455                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1456                                 $temp = explode( '=', trim( $restrict ) );
1457                                 if(count($temp) == 1) {
1458                                         // old old format should be treated as edit/move restriction
1459                                         $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1460                                         $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1461                                 } else {
1462                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1463                                 }
1464                         }
1465
1466                         $this->mOldRestrictions = true;
1467                         $this->mCascadeRestriction = false;
1468
1469                 }
1470
1471                 if ($dbr->numRows( $res) ) {
1472                         # Current system - load second to make them override.
1473                         while ($row = $dbr->fetchObject( $res ) ) {
1474                                 # Cycle through all the restrictions.
1475
1476                                 $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1477
1478                                 $this->mCascadeRestriction |= $row->pr_cascade;
1479                         }
1480                 }
1481
1482                 $this->mRestrictionsLoaded = true;
1483         }
1484
1485         function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1486                 if( !$this->mRestrictionsLoaded ) {
1487                         $dbr =& wfGetDB( DB_SLAVE );
1488
1489                         $res = $dbr->select( 'page_restrictions', '*',
1490                                 array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1491
1492                         $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1493                 }
1494         }
1495
1496         /**
1497          * Accessor/initialisation for mRestrictions
1498          *
1499          * @access public
1500          * @param string $action action that permission needs to be checked for
1501          * @return array the array of groups allowed to edit this article
1502          */
1503         function getRestrictions( $action ) {
1504                 if( $this->exists() ) {
1505                         if( !$this->mRestrictionsLoaded ) {
1506                                 $this->loadRestrictions();
1507                         }
1508                         return isset( $this->mRestrictions[$action] )
1509                                         ? $this->mRestrictions[$action]
1510                                         : array();
1511                 } else {
1512                         return array();
1513                 }
1514         }
1515
1516         /**
1517          * Is there a version of this page in the deletion archive?
1518          * @return int the number of archived revisions
1519          * @access public
1520          */
1521         function isDeleted() {
1522                 $fname = 'Title::isDeleted';
1523                 if ( $this->getNamespace() < 0 ) {
1524                         $n = 0;
1525                 } else {
1526                         $dbr =& wfGetDB( DB_SLAVE );
1527                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1528                                 'ar_title' => $this->getDBkey() ), $fname );
1529                         if( $this->getNamespace() == NS_IMAGE ) {
1530                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1531                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1532                         }
1533                 }
1534                 return (int)$n;
1535         }
1536
1537         /**
1538          * Get the article ID for this Title from the link cache,
1539          * adding it if necessary
1540          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1541          *      for update
1542          * @return int the ID
1543          */
1544         public function getArticleID( $flags = 0 ) {
1545                 $linkCache =& LinkCache::singleton();
1546                 if ( $flags & GAID_FOR_UPDATE ) {
1547                         $oldUpdate = $linkCache->forUpdate( true );
1548                         $this->mArticleID = $linkCache->addLinkObj( $this );
1549                         $linkCache->forUpdate( $oldUpdate );
1550                 } else {
1551                         if ( -1 == $this->mArticleID ) {
1552                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1553                         }
1554                 }
1555                 return $this->mArticleID;
1556         }
1557
1558         function getLatestRevID() {
1559                 if ($this->mLatestID !== false)
1560                         return $this->mLatestID;
1561
1562                 $db =& wfGetDB(DB_SLAVE);
1563                 return $this->mLatestID = $db->selectField( 'revision',
1564                         "max(rev_id)",
1565                         array('rev_page' => $this->getArticleID()),
1566                         'Title::getLatestRevID' );
1567         }
1568
1569         /**
1570          * This clears some fields in this object, and clears any associated
1571          * keys in the "bad links" section of the link cache.
1572          *
1573          * - This is called from Article::insertNewArticle() to allow
1574          * loading of the new page_id. It's also called from
1575          * Article::doDeleteArticle()
1576          *
1577          * @param int $newid the new Article ID
1578          * @access public
1579          */
1580         function resetArticleID( $newid ) {
1581                 $linkCache =& LinkCache::singleton();
1582                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1583
1584                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1585                 else { $this->mArticleID = $newid; }
1586                 $this->mRestrictionsLoaded = false;
1587                 $this->mRestrictions = array();
1588         }
1589
1590         /**
1591          * Updates page_touched for this page; called from LinksUpdate.php
1592          * @return bool true if the update succeded
1593          * @access public
1594          */
1595         function invalidateCache() {
1596                 global $wgUseFileCache;
1597
1598                 if ( wfReadOnly() ) {
1599                         return;
1600                 }
1601
1602                 $dbw =& wfGetDB( DB_MASTER );
1603                 $success = $dbw->update( 'page',
1604                         array( /* SET */
1605                                 'page_touched' => $dbw->timestamp()
1606                         ), array( /* WHERE */
1607                                 'page_namespace' => $this->getNamespace() ,
1608                                 'page_title' => $this->getDBkey()
1609                         ), 'Title::invalidateCache'
1610                 );
1611
1612                 if ($wgUseFileCache) {
1613                         $cache = new HTMLFileCache($this);
1614                         @unlink($cache->fileCacheName());
1615                 }
1616
1617                 return $success;
1618         }
1619
1620         /**
1621          * Prefix some arbitrary text with the namespace or interwiki prefix
1622          * of this object
1623          *
1624          * @param string $name the text
1625          * @return string the prefixed text
1626          * @private
1627          */
1628         /* private */ function prefix( $name ) {
1629                 $p = '';
1630                 if ( '' != $this->mInterwiki ) {
1631                         $p = $this->mInterwiki . ':';
1632                 }
1633                 if ( 0 != $this->mNamespace ) {
1634                         $p .= $this->getNsText() . ':';
1635                 }
1636                 return $p . $name;
1637         }
1638
1639         /**
1640          * Secure and split - main initialisation function for this object
1641          *
1642          * Assumes that mDbkeyform has been set, and is urldecoded
1643          * and uses underscores, but not otherwise munged.  This function
1644          * removes illegal characters, splits off the interwiki and
1645          * namespace prefixes, sets the other forms, and canonicalizes
1646          * everything.
1647          * @return bool true on success
1648          * @private
1649          */
1650         /* private */ function secureAndSplit() {
1651                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1652
1653                 # Initialisation
1654                 static $rxTc = false;
1655                 if( !$rxTc ) {
1656                         # % is needed as well
1657                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1658                 }
1659
1660                 $this->mInterwiki = $this->mFragment = '';
1661                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1662
1663                 $dbkey = $this->mDbkeyform;
1664
1665                 # Strip Unicode bidi override characters.
1666                 # Sometimes they slip into cut-n-pasted page titles, where the
1667                 # override chars get included in list displays.
1668                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1669                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1670
1671                 # Clean up whitespace
1672                 #
1673                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1674                 $dbkey = trim( $dbkey, '_' );
1675
1676                 if ( '' == $dbkey ) {
1677                         return false;
1678                 }
1679
1680                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1681                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1682                         return false;
1683                 }
1684
1685                 $this->mDbkeyform = $dbkey;
1686
1687                 # Initial colon indicates main namespace rather than specified default
1688                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1689                 if ( ':' == $dbkey{0} ) {
1690                         $this->mNamespace = NS_MAIN;
1691                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1692                 }
1693
1694                 # Namespace or interwiki prefix
1695                 $firstPass = true;
1696                 do {
1697                         $m = array();
1698                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1699                                 $p = $m[1];
1700                                 $lowerNs = $wgContLang->lc( $p );
1701                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1702                                         # Canonical namespace
1703                                         $dbkey = $m[2];
1704                                         $this->mNamespace = $ns;
1705                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1706                                         # Ordinary namespace
1707                                         $dbkey = $m[2];
1708                                         $this->mNamespace = $ns;
1709                                 } elseif( $this->getInterwikiLink( $p ) ) {
1710                                         if( !$firstPass ) {
1711                                                 # Can't make a local interwiki link to an interwiki link.
1712                                                 # That's just crazy!
1713                                                 return false;
1714                                         }
1715
1716                                         # Interwiki link
1717                                         $dbkey = $m[2];
1718                                         $this->mInterwiki = $wgContLang->lc( $p );
1719
1720                                         # Redundant interwiki prefix to the local wiki
1721                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1722                                                 if( $dbkey == '' ) {
1723                                                         # Can't have an empty self-link
1724                                                         return false;
1725                                                 }
1726                                                 $this->mInterwiki = '';
1727                                                 $firstPass = false;
1728                                                 # Do another namespace split...
1729                                                 continue;
1730                                         }
1731
1732                                         # If there's an initial colon after the interwiki, that also
1733                                         # resets the default namespace
1734                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1735                                                 $this->mNamespace = NS_MAIN;
1736                                                 $dbkey = substr( $dbkey, 1 );
1737                                         }
1738                                 }
1739                                 # If there's no recognized interwiki or namespace,
1740                                 # then let the colon expression be part of the title.
1741                         }
1742                         break;
1743                 } while( true );
1744
1745                 # We already know that some pages won't be in the database!
1746                 #
1747                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1748                         $this->mArticleID = 0;
1749                 }
1750                 $fragment = strstr( $dbkey, '#' );
1751                 if ( false !== $fragment ) {
1752                         $this->setFragment( $fragment );
1753                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1754                         # remove whitespace again: prevents "Foo_bar_#"
1755                         # becoming "Foo_bar_"
1756                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1757                 }
1758
1759                 # Reject illegal characters.
1760                 #
1761                 if( preg_match( $rxTc, $dbkey ) ) {
1762                         return false;
1763                 }
1764
1765                 /**
1766                  * Pages with "/./" or "/../" appearing in the URLs will
1767                  * often be unreachable due to the way web browsers deal
1768                  * with 'relative' URLs. Forbid them explicitly.
1769                  */
1770                 if ( strpos( $dbkey, '.' ) !== false &&
1771                      ( $dbkey === '.' || $dbkey === '..' ||
1772                        strpos( $dbkey, './' ) === 0  ||
1773                        strpos( $dbkey, '../' ) === 0 ||
1774                        strpos( $dbkey, '/./' ) !== false ||
1775                        strpos( $dbkey, '/../' ) !== false ) )
1776                 {
1777                         return false;
1778                 }
1779
1780                 /**
1781                  * Limit the size of titles to 255 bytes.
1782                  * This is typically the size of the underlying database field.
1783                  * We make an exception for special pages, which don't need to be stored
1784                  * in the database, and may edge over 255 bytes due to subpage syntax
1785                  * for long titles, e.g. [[Special:Block/Long name]]
1786                  */
1787                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1788                   strlen( $dbkey ) > 512 )
1789                 {
1790                         return false;
1791                 }
1792
1793                 /**
1794                  * Normally, all wiki links are forced to have
1795                  * an initial capital letter so [[foo]] and [[Foo]]
1796                  * point to the same place.
1797                  *
1798                  * Don't force it for interwikis, since the other
1799                  * site might be case-sensitive.
1800                  */
1801                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1802                         $dbkey = $wgContLang->ucfirst( $dbkey );
1803                 }
1804
1805                 /**
1806                  * Can't make a link to a namespace alone...
1807                  * "empty" local links can only be self-links
1808                  * with a fragment identifier.
1809                  */
1810                 if( $dbkey == '' &&
1811                         $this->mInterwiki == '' &&
1812                         $this->mNamespace != NS_MAIN ) {
1813                         return false;
1814                 }
1815
1816                 // Any remaining initial :s are illegal.
1817                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1818                         return false;
1819                 }
1820
1821                 # Fill fields
1822                 $this->mDbkeyform = $dbkey;
1823                 $this->mUrlform = wfUrlencode( $dbkey );
1824
1825                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1826
1827                 return true;
1828         }
1829
1830         /**
1831          * Set the fragment for this title
1832          * This is kind of bad, since except for this rarely-used function, Title objects
1833          * are immutable. The reason this is here is because it's better than setting the
1834          * members directly, which is what Linker::formatComment was doing previously.
1835          *
1836          * @param string $fragment text
1837          * @access kind of public
1838          */
1839         function setFragment( $fragment ) {
1840                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1841         }
1842
1843         /**
1844          * Get a Title object associated with the talk page of this article
1845          * @return Title the object for the talk page
1846          * @access public
1847          */
1848         function getTalkPage() {
1849                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1850         }
1851
1852         /**
1853          * Get a title object associated with the subject page of this
1854          * talk page
1855          *
1856          * @return Title the object for the subject page
1857          * @access public
1858          */
1859         function getSubjectPage() {
1860                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1861         }
1862
1863         /**
1864          * Get an array of Title objects linking to this Title
1865          * Also stores the IDs in the link cache.
1866          *
1867          * WARNING: do not use this function on arbitrary user-supplied titles!
1868          * On heavily-used templates it will max out the memory.
1869          *
1870          * @param string $options may be FOR UPDATE
1871          * @return array the Title objects linking here
1872          * @access public
1873          */
1874         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1875                 $linkCache =& LinkCache::singleton();
1876
1877                 if ( $options ) {
1878                         $db =& wfGetDB( DB_MASTER );
1879                 } else {
1880                         $db =& wfGetDB( DB_SLAVE );
1881                 }
1882
1883                 $res = $db->select( array( 'page', $table ),
1884                         array( 'page_namespace', 'page_title', 'page_id' ),
1885                         array(
1886                                 "{$prefix}_from=page_id",
1887                                 "{$prefix}_namespace" => $this->getNamespace(),
1888                                 "{$prefix}_title"     => $this->getDbKey() ),
1889                         'Title::getLinksTo',
1890                         $options );
1891
1892                 $retVal = array();
1893                 if ( $db->numRows( $res ) ) {
1894                         while ( $row = $db->fetchObject( $res ) ) {
1895                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1896                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1897                                         $retVal[] = $titleObj;
1898                                 }
1899                         }
1900                 }
1901                 $db->freeResult( $res );
1902                 return $retVal;
1903         }
1904
1905         /**
1906          * Get an array of Title objects using this Title as a template
1907          * Also stores the IDs in the link cache.
1908          *
1909          * WARNING: do not use this function on arbitrary user-supplied titles!
1910          * On heavily-used templates it will max out the memory.
1911          *
1912          * @param string $options may be FOR UPDATE
1913          * @return array the Title objects linking here
1914          * @access public
1915          */
1916         function getTemplateLinksTo( $options = '' ) {
1917                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1918         }
1919
1920         /**
1921          * Get an array of Title objects referring to non-existent articles linked from this page
1922          *
1923          * @param string $options may be FOR UPDATE
1924          * @return array the Title objects
1925          * @access public
1926          */
1927         function getBrokenLinksFrom( $options = '' ) {
1928                 if ( $options ) {
1929                         $db =& wfGetDB( DB_MASTER );
1930                 } else {
1931                         $db =& wfGetDB( DB_SLAVE );
1932                 }
1933
1934                 $res = $db->safeQuery(
1935                           "SELECT pl_namespace, pl_title
1936                              FROM !
1937                         LEFT JOIN !
1938                                ON pl_namespace=page_namespace
1939                               AND pl_title=page_title
1940                             WHERE pl_from=?
1941                               AND page_namespace IS NULL
1942                                   !",
1943                         $db->tableName( 'pagelinks' ),
1944                         $db->tableName( 'page' ),
1945                         $this->getArticleId(),
1946                         $options );
1947
1948                 $retVal = array();
1949                 if ( $db->numRows( $res ) ) {
1950                         while ( $row = $db->fetchObject( $res ) ) {
1951                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1952                         }
1953                 }
1954                 $db->freeResult( $res );
1955                 return $retVal;
1956         }
1957
1958
1959         /**
1960          * Get a list of URLs to purge from the Squid cache when this
1961          * page changes
1962          *
1963          * @return array the URLs
1964          * @access public
1965          */
1966         function getSquidURLs() {
1967                 global $wgContLang;
1968
1969                 $urls = array(
1970                         $this->getInternalURL(),
1971                         $this->getInternalURL( 'action=history' )
1972                 );
1973
1974                 // purge variant urls as well
1975                 if($wgContLang->hasVariants()){
1976                         $variants = $wgContLang->getVariants();
1977                         foreach($variants as $vCode){
1978                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
1979                                 $urls[] = $this->getInternalURL('',$vCode);
1980                         }
1981                 }
1982
1983                 return $urls;
1984         }
1985
1986         function purgeSquid() {
1987                 global $wgUseSquid;
1988                 if ( $wgUseSquid ) {
1989                         $urls = $this->getSquidURLs();
1990                         $u = new SquidUpdate( $urls );
1991                         $u->doUpdate();
1992                 }
1993         }
1994
1995         /**
1996          * Move this page without authentication
1997          * @param Title &$nt the new page Title
1998          * @access public
1999          */
2000         function moveNoAuth( &$nt ) {
2001                 return $this->moveTo( $nt, false );
2002         }
2003
2004         /**
2005          * Check whether a given move operation would be valid.
2006          * Returns true if ok, or a message key string for an error message
2007          * if invalid. (Scarrrrry ugly interface this.)
2008          * @param Title &$nt the new title
2009          * @param bool $auth indicates whether $wgUser's permissions
2010          *      should be checked
2011          * @return mixed true on success, message name on failure
2012          * @access public
2013          */
2014         function isValidMoveOperation( &$nt, $auth = true ) {
2015                 if( !$this or !$nt ) {
2016                         return 'badtitletext';
2017                 }
2018                 if( $this->equals( $nt ) ) {
2019                         return 'selfmove';
2020                 }
2021                 if( !$this->isMovable() || !$nt->isMovable() ) {
2022                         return 'immobile_namespace';
2023                 }
2024
2025                 $oldid = $this->getArticleID();
2026                 $newid = $nt->getArticleID();
2027
2028                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2029                         return 'articleexists';
2030                 }
2031                 if ( ( '' == $this->getDBkey() ) ||
2032                          ( !$oldid ) ||
2033                      ( '' == $nt->getDBkey() ) ) {
2034                         return 'badarticleerror';
2035                 }
2036
2037                 if ( $auth && (
2038                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
2039                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
2040                         return 'protectedpage';
2041                 }
2042
2043                 # The move is allowed only if (1) the target doesn't exist, or
2044                 # (2) the target is a redirect to the source, and has no history
2045                 # (so we can undo bad moves right after they're done).
2046
2047                 if ( 0 != $newid ) { # Target exists; check for validity
2048                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2049                                 return 'articleexists';
2050                         }
2051                 }
2052                 return true;
2053         }
2054
2055         /**
2056          * Move a title to a new location
2057          * @param Title &$nt the new title
2058          * @param bool $auth indicates whether $wgUser's permissions
2059          *      should be checked
2060          * @return mixed true on success, message name on failure
2061          * @access public
2062          */
2063         function moveTo( &$nt, $auth = true, $reason = '' ) {
2064                 $err = $this->isValidMoveOperation( $nt, $auth );
2065                 if( is_string( $err ) ) {
2066                         return $err;
2067                 }
2068
2069                 $pageid = $this->getArticleID();
2070                 if( $nt->exists() ) {
2071                         $this->moveOverExistingRedirect( $nt, $reason );
2072                         $pageCountChange = 0;
2073                 } else { # Target didn't exist, do normal move.
2074                         $this->moveToNewTitle( $nt, $reason );
2075                         $pageCountChange = 1;
2076                 }
2077                 $redirid = $this->getArticleID();
2078
2079                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
2080                 $dbw =& wfGetDB( DB_MASTER );
2081                 $categorylinks = $dbw->tableName( 'categorylinks' );
2082                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
2083                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
2084                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
2085                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
2086
2087                 # Update watchlists
2088
2089                 $oldnamespace = $this->getNamespace() & ~1;
2090                 $newnamespace = $nt->getNamespace() & ~1;
2091                 $oldtitle = $this->getDBkey();
2092                 $newtitle = $nt->getDBkey();
2093
2094                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2095                         WatchedItem::duplicateEntries( $this, $nt );
2096                 }
2097
2098                 # Update search engine
2099                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2100                 $u->doUpdate();
2101                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2102                 $u->doUpdate();
2103
2104                 # Update site_stats
2105                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2106                         # No longer a content page
2107                         # Not viewed, edited, removing
2108                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2109                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2110                         # Now a content page
2111                         # Not viewed, edited, adding
2112                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2113                 } elseif( $pageCountChange ) {
2114                         # Redirect added
2115                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2116                 } else {
2117                         # Nothing special
2118                         $u = false;
2119                 }
2120                 if( $u )
2121                         $u->doUpdate();
2122
2123                 global $wgUser;
2124                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2125                 return true;
2126         }
2127
2128         /**
2129          * Move page to a title which is at present a redirect to the
2130          * source page
2131          *
2132          * @param Title &$nt the page to move to, which should currently
2133          *      be a redirect
2134          * @private
2135          */
2136         function moveOverExistingRedirect( &$nt, $reason = '' ) {
2137                 global $wgUseSquid;
2138                 $fname = 'Title::moveOverExistingRedirect';
2139                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2140
2141                 if ( $reason ) {
2142                         $comment .= ": $reason";
2143                 }
2144
2145                 $now = wfTimestampNow();
2146                 $newid = $nt->getArticleID();
2147                 $oldid = $this->getArticleID();
2148                 $dbw =& wfGetDB( DB_MASTER );
2149                 $linkCache =& LinkCache::singleton();
2150
2151                 # Delete the old redirect. We don't save it to history since
2152                 # by definition if we've got here it's rather uninteresting.
2153                 # We have to remove it so that the next step doesn't trigger
2154                 # a conflict on the unique namespace+title index...
2155                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2156
2157                 # Save a null revision in the page's history notifying of the move
2158                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2159                 $nullRevId = $nullRevision->insertOn( $dbw );
2160
2161                 # Change the name of the target page:
2162                 $dbw->update( 'page',
2163                         /* SET */ array(
2164                                 'page_touched'   => $dbw->timestamp($now),
2165                                 'page_namespace' => $nt->getNamespace(),
2166                                 'page_title'     => $nt->getDBkey(),
2167                                 'page_latest'    => $nullRevId,
2168                         ),
2169                         /* WHERE */ array( 'page_id' => $oldid ),
2170                         $fname
2171                 );
2172                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2173
2174                 # Recreate the redirect, this time in the other direction.
2175                 $mwRedir = MagicWord::get( 'redirect' );
2176                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2177                 $redirectArticle = new Article( $this );
2178                 $newid = $redirectArticle->insertOn( $dbw );
2179                 $redirectRevision = new Revision( array(
2180                         'page'    => $newid,
2181                         'comment' => $comment,
2182                         'text'    => $redirectText ) );
2183                 $redirectRevision->insertOn( $dbw );
2184                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2185                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2186
2187                 # Log the move
2188                 $log = new LogPage( 'move' );
2189                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2190
2191                 # Now, we record the link from the redirect to the new title.
2192                 # It should have no other outgoing links...
2193                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2194                 $dbw->insert( 'pagelinks',
2195                         array(
2196                                 'pl_from'      => $newid,
2197                                 'pl_namespace' => $nt->getNamespace(),
2198                                 'pl_title'     => $nt->getDbKey() ),
2199                         $fname );
2200
2201                 # Purge squid
2202                 if ( $wgUseSquid ) {
2203                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2204                         $u = new SquidUpdate( $urls );
2205                         $u->doUpdate();
2206                 }
2207         }
2208
2209         /**
2210          * Move page to non-existing title.
2211          * @param Title &$nt the new Title
2212          * @private
2213          */
2214         function moveToNewTitle( &$nt, $reason = '' ) {
2215                 global $wgUseSquid;
2216                 $fname = 'MovePageForm::moveToNewTitle';
2217                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2218                 if ( $reason ) {
2219                         $comment .= ": $reason";
2220                 }
2221
2222                 $newid = $nt->getArticleID();
2223                 $oldid = $this->getArticleID();
2224                 $dbw =& wfGetDB( DB_MASTER );
2225                 $now = $dbw->timestamp();
2226                 $linkCache =& LinkCache::singleton();
2227
2228                 # Save a null revision in the page's history notifying of the move
2229                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2230                 $nullRevId = $nullRevision->insertOn( $dbw );
2231
2232                 # Rename cur entry
2233                 $dbw->update( 'page',
2234                         /* SET */ array(
2235                                 'page_touched'   => $now,
2236                                 'page_namespace' => $nt->getNamespace(),
2237                                 'page_title'     => $nt->getDBkey(),
2238                                 'page_latest'    => $nullRevId,
2239                         ),
2240                         /* WHERE */ array( 'page_id' => $oldid ),
2241                         $fname
2242                 );
2243
2244                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2245
2246                 # Insert redirect
2247                 $mwRedir = MagicWord::get( 'redirect' );
2248                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2249                 $redirectArticle = new Article( $this );
2250                 $newid = $redirectArticle->insertOn( $dbw );
2251                 $redirectRevision = new Revision( array(
2252                         'page'    => $newid,
2253                         'comment' => $comment,
2254                         'text'    => $redirectText ) );
2255                 $redirectRevision->insertOn( $dbw );
2256                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2257                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2258
2259                 # Log the move
2260                 $log = new LogPage( 'move' );
2261                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2262
2263                 # Purge caches as per article creation
2264                 Article::onArticleCreate( $nt );
2265
2266                 # Record the just-created redirect's linking to the page
2267                 $dbw->insert( 'pagelinks',
2268                         array(
2269                                 'pl_from'      => $newid,
2270                                 'pl_namespace' => $nt->getNamespace(),
2271                                 'pl_title'     => $nt->getDBkey() ),
2272                         $fname );
2273
2274                 # Purge old title from squid
2275                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2276                 $this->purgeSquid();
2277         }
2278
2279         /**
2280          * Checks if $this can be moved to a given Title
2281          * - Selects for update, so don't call it unless you mean business
2282          *
2283          * @param Title &$nt the new title to check
2284          * @access public
2285          */
2286         function isValidMoveTarget( $nt ) {
2287
2288                 $fname = 'Title::isValidMoveTarget';
2289                 $dbw =& wfGetDB( DB_MASTER );
2290
2291                 # Is it a redirect?
2292                 $id  = $nt->getArticleID();
2293                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2294                         array( 'page_is_redirect','old_text','old_flags' ),
2295                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2296                         $fname, 'FOR UPDATE' );
2297
2298                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2299                         # Not a redirect
2300                         wfDebug( __METHOD__ . ": not a redirect\n" );
2301                         return false;
2302                 }
2303                 $text = Revision::getRevisionText( $obj );
2304
2305                 # Does the redirect point to the source?
2306                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2307                 $m = array();
2308                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2309                         $redirTitle = Title::newFromText( $m[1] );
2310                         if( !is_object( $redirTitle ) ||
2311                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2312                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2313                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2314                                 return false;
2315                         }
2316                 } else {
2317                         # Fail safe
2318                         wfDebug( __METHOD__ . ": failsafe\n" );
2319                         return false;
2320                 }
2321
2322                 # Does the article have a history?
2323                 $row = $dbw->selectRow( array( 'page', 'revision'),
2324                         array( 'rev_id' ),
2325                         array( 'page_namespace' => $nt->getNamespace(),
2326                                 'page_title' => $nt->getDBkey(),
2327                                 'page_id=rev_page AND page_latest != rev_id'
2328                         ), $fname, 'FOR UPDATE'
2329                 );
2330
2331                 # Return true if there was no history
2332                 return $row === false;
2333         }
2334
2335         /**
2336          * Create a redirect; fails if the title already exists; does
2337          * not notify RC
2338          *
2339          * @param Title $dest the destination of the redirect
2340          * @param string $comment the comment string describing the move
2341          * @return bool true on success
2342          * @access public
2343          */
2344         function createRedirect( $dest, $comment ) {
2345                 if ( $this->getArticleID() ) {
2346                         return false;
2347                 }
2348
2349                 $fname = 'Title::createRedirect';
2350                 $dbw =& wfGetDB( DB_MASTER );
2351
2352                 $article = new Article( $this );
2353                 $newid = $article->insertOn( $dbw );
2354                 $revision = new Revision( array(
2355                         'page'      => $newid,
2356                         'comment'   => $comment,
2357                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2358                         ) );
2359                 $revision->insertOn( $dbw );
2360                 $article->updateRevisionOn( $dbw, $revision, 0 );
2361
2362                 # Link table
2363                 $dbw->insert( 'pagelinks',
2364                         array(
2365                                 'pl_from'      => $newid,
2366                                 'pl_namespace' => $dest->getNamespace(),
2367                                 'pl_title'     => $dest->getDbKey()
2368                         ), $fname
2369                 );
2370
2371                 Article::onArticleCreate( $this );
2372                 return true;
2373         }
2374
2375         /**
2376          * Get categories to which this Title belongs and return an array of
2377          * categories' names.
2378          *
2379          * @return array an array of parents in the form:
2380          *      $parent => $currentarticle
2381          * @access public
2382          */
2383         function getParentCategories() {
2384                 global $wgContLang;
2385
2386                 $titlekey = $this->getArticleId();
2387                 $dbr =& wfGetDB( DB_SLAVE );
2388                 $categorylinks = $dbr->tableName( 'categorylinks' );
2389
2390                 # NEW SQL
2391                 $sql = "SELECT * FROM $categorylinks"
2392                      ." WHERE cl_from='$titlekey'"
2393                          ." AND cl_from <> '0'"
2394                          ." ORDER BY cl_sortkey";
2395
2396                 $res = $dbr->query ( $sql ) ;
2397
2398                 if($dbr->numRows($res) > 0) {
2399                         while ( $x = $dbr->fetchObject ( $res ) )
2400                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2401                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2402                         $dbr->freeResult ( $res ) ;
2403                 } else {
2404                         $data = '';
2405                 }
2406                 return $data;
2407         }
2408
2409         /**
2410          * Get a tree of parent categories
2411          * @param array $children an array with the children in the keys, to check for circular refs
2412          * @return array
2413          * @access public
2414          */
2415         function getParentCategoryTree( $children = array() ) {
2416                 $parents = $this->getParentCategories();
2417
2418                 if($parents != '') {
2419                         foreach($parents as $parent => $current) {
2420                                 if ( array_key_exists( $parent, $children ) ) {
2421                                         # Circular reference
2422                                         $stack[$parent] = array();
2423                                 } else {
2424                                         $nt = Title::newFromText($parent);
2425                                         if ( $nt ) {
2426                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2427                                         }
2428                                 }
2429                         }
2430                         return $stack;
2431                 } else {
2432                         return array();
2433                 }
2434         }
2435
2436
2437         /**
2438          * Get an associative array for selecting this title from
2439          * the "page" table
2440          *
2441          * @return array
2442          * @access public
2443          */
2444         function pageCond() {
2445                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2446         }
2447
2448         /**
2449          * Get the revision ID of the previous revision
2450          *
2451          * @param integer $revision  Revision ID. Get the revision that was before this one.
2452          * @return integer $oldrevision|false
2453          */
2454         function getPreviousRevisionID( $revision ) {
2455                 $dbr =& wfGetDB( DB_SLAVE );
2456                 return $dbr->selectField( 'revision', 'rev_id',
2457                         'rev_page=' . intval( $this->getArticleId() ) .
2458                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2459         }
2460
2461         /**
2462          * Get the revision ID of the next revision
2463          *
2464          * @param integer $revision  Revision ID. Get the revision that was after this one.
2465          * @return integer $oldrevision|false
2466          */
2467         function getNextRevisionID( $revision ) {
2468                 $dbr =& wfGetDB( DB_SLAVE );
2469                 return $dbr->selectField( 'revision', 'rev_id',
2470                         'rev_page=' . intval( $this->getArticleId() ) .
2471                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2472         }
2473
2474         /**
2475          * Get the number of revisions between the given revision IDs.
2476          *
2477          * @param integer $old  Revision ID.
2478          * @param integer $new  Revision ID.
2479          * @return integer  Number of revisions between these IDs.
2480          */
2481         function countRevisionsBetween( $old, $new ) {
2482                 $dbr =& wfGetDB( DB_SLAVE );
2483                 return $dbr->selectField( 'revision', 'count(*)',
2484                         'rev_page = ' . intval( $this->getArticleId() ) .
2485                         ' AND rev_id > ' . intval( $old ) .
2486                         ' AND rev_id < ' . intval( $new ) );
2487         }
2488
2489         /**
2490          * Compare with another title.
2491          *
2492          * @param Title $title
2493          * @return bool
2494          */
2495         function equals( $title ) {
2496                 // Note: === is necessary for proper matching of number-like titles.
2497                 return $this->getInterwiki() === $title->getInterwiki()
2498                         && $this->getNamespace() == $title->getNamespace()
2499                         && $this->getDbkey() === $title->getDbkey();
2500         }
2501
2502         /**
2503          * Check if page exists
2504          * @return bool
2505          */
2506         function exists() {
2507                 return $this->getArticleId() != 0;
2508         }
2509
2510         /**
2511          * Should a link should be displayed as a known link, just based on its title?
2512          *
2513          * Currently, a self-link with a fragment and special pages are in
2514          * this category. Special pages never exist in the database.
2515          */
2516         function isAlwaysKnown() {
2517                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2518                   || NS_SPECIAL == $this->mNamespace;
2519         }
2520
2521         /**
2522          * Update page_touched timestamps and send squid purge messages for
2523          * pages linking to this title. May be sent to the job queue depending
2524          * on the number of links. Typically called on create and delete.
2525          */
2526         function touchLinks() {
2527                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2528                 $u->doUpdate();
2529
2530                 if ( $this->getNamespace() == NS_CATEGORY ) {
2531                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2532                         $u->doUpdate();
2533                 }
2534         }
2535
2536         /**
2537          * Get the last touched timestamp
2538          */
2539         function getTouched() {
2540                 $dbr =& wfGetDB( DB_SLAVE );
2541                 $touched = $dbr->selectField( 'page', 'page_touched',
2542                         array(
2543                                 'page_namespace' => $this->getNamespace(),
2544                                 'page_title' => $this->getDBkey()
2545                         ), __METHOD__
2546                 );
2547                 return $touched;
2548         }
2549
2550         /**
2551          * Get a cached value from a global cache that is invalidated when this page changes
2552          * @param string $key the key
2553          * @param callback $callback A callback function which generates the value on cache miss
2554          *
2555          * @deprecated use DependencyWrapper
2556          */
2557         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2558                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2559                         $params, new TitleDependency( $this ) );
2560         }
2561
2562         function trackbackURL() {
2563                 global $wgTitle, $wgScriptPath, $wgServer;
2564
2565                 return "$wgServer$wgScriptPath/trackback.php?article="
2566                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2567         }
2568
2569         function trackbackRDF() {
2570                 $url = htmlspecialchars($this->getFullURL());
2571                 $title = htmlspecialchars($this->getText());
2572                 $tburl = $this->trackbackURL();
2573
2574                 return "
2575 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2576          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2577          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2578 <rdf:Description
2579    rdf:about=\"$url\"
2580    dc:identifier=\"$url\"
2581    dc:title=\"$title\"
2582    trackback:ping=\"$tburl\" />
2583 </rdf:RDF>";
2584         }
2585
2586         /**
2587          * Generate strings used for xml 'id' names in monobook tabs
2588          * @return string
2589          */
2590         function getNamespaceKey() {
2591                 global $wgContLang;
2592                 switch ($this->getNamespace()) {
2593                         case NS_MAIN:
2594                         case NS_TALK:
2595                                 return 'nstab-main';
2596                         case NS_USER:
2597                         case NS_USER_TALK:
2598                                 return 'nstab-user';
2599                         case NS_MEDIA:
2600                                 return 'nstab-media';
2601                         case NS_SPECIAL:
2602                                 return 'nstab-special';
2603                         case NS_PROJECT:
2604                         case NS_PROJECT_TALK:
2605                                 return 'nstab-project';
2606                         case NS_IMAGE:
2607                         case NS_IMAGE_TALK:
2608                                 return 'nstab-image';
2609                         case NS_MEDIAWIKI:
2610                         case NS_MEDIAWIKI_TALK:
2611                                 return 'nstab-mediawiki';
2612                         case NS_TEMPLATE:
2613                         case NS_TEMPLATE_TALK:
2614                                 return 'nstab-template';
2615                         case NS_HELP:
2616                         case NS_HELP_TALK:
2617                                 return 'nstab-help';
2618                         case NS_CATEGORY:
2619                         case NS_CATEGORY_TALK:
2620                                 return 'nstab-category';
2621                         default:
2622                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2623                 }
2624         }
2625
2626         /**
2627          * Returns true if this title resolves to the named special page
2628          * @param string $name The special page name
2629          * @access public
2630          */
2631         function isSpecial( $name ) {
2632                 if ( $this->getNamespace() == NS_SPECIAL ) {
2633                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2634                         if ( $name == $thisName ) {
2635                                 return true;
2636                         }
2637                 }
2638                 return false;
2639         }
2640
2641         /**
2642          * If the Title refers to a special page alias which is not the local default,
2643          * returns a new Title which points to the local default. Otherwise, returns $this.
2644          */
2645         function fixSpecialName() {
2646                 if ( $this->getNamespace() == NS_SPECIAL ) {
2647                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2648                         if ( $canonicalName ) {
2649                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2650                                 if ( $localName != $this->mDbkeyform ) {
2651                                         return Title::makeTitle( NS_SPECIAL, $localName );
2652                                 }
2653                         }
2654                 }
2655                 return $this;
2656         }
2657
2658         /**
2659          * Is this Title in a namespace which contains content?
2660          * In other words, is this a content page, for the purposes of calculating
2661          * statistics, etc?
2662          *
2663          * @return bool
2664          */
2665         public function isContentPage() {
2666                 return Namespace::isContent( $this->getNamespace() );
2667         }
2668
2669 }
2670
2671 ?>