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 $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  56         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  57         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  58         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  59         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  60         var $mDefaultNamespace;         # Namespace index when there is no namespace
  61                                         # Zero except in {{transclusion}} tags
  62         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  63         /**#@-*/
  64
  65
  66         /**
  67          * Constructor
  68          * @private
  69          */
  70         /* private */ function __construct() {
  71                 $this->mInterwiki = $this->mUrlform =
  72                 $this->mTextform = $this->mDbkeyform = '';
  73                 $this->mArticleID = -1;
  74                 $this->mNamespace = NS_MAIN;
  75                 $this->mRestrictionsLoaded = false;
  76                 $this->mRestrictions = array();
  77                 # Dont change the following, NS_MAIN is hardcoded in several place
  78                 # See bug #696
  79                 $this->mDefaultNamespace = NS_MAIN;
  80                 $this->mWatched = NULL;
  81                 $this->mLatestID = false;
  82                 $this->mOldRestrictions = false;
  83         }
  84
  85         /**
  86          * Create a new Title from a prefixed DB key
  87          * @param string $key The database key, which has underscores
  88          *      instead of spaces, possibly including namespace and
  89          *      interwiki prefixes
  90          * @return Title the new object, or NULL on an error
  91          * @static
  92          * @access public
  93          */
  94         /* static */ function newFromDBkey( $key ) {
  95                 $t = new Title();
  96                 $t->mDbkeyform = $key;
  97                 if( $t->secureAndSplit() )
  98                         return $t;
  99                 else
 100                         return NULL;
 101         }
 102
 103         /**
 104          * Create a new Title from text, such as what one would
 105          * find in a link. Decodes any HTML entities in the text.
 106          *
 107          * @param string $text the link text; spaces, prefixes,
 108          *      and an initial ':' indicating the main namespace
 109          *      are accepted
 110          * @param int $defaultNamespace the namespace to use if
 111          *      none is specified by a prefix
 112          * @return Title the new object, or NULL on an error
 113          * @static
 114          * @access public
 115          */
 116         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 117                 if( is_object( $text ) ) {
 118                         throw new MWException( 'Title::newFromText given an object' );
 119                 }
 120
 121                 /**
 122                  * Wiki pages often contain multiple links to the same page.
 123                  * Title normalization and parsing can become expensive on
 124                  * pages with many links, so we can save a little time by
 125                  * caching them.
 126                  *
 127                  * In theory these are value objects and won't get changed...
 128                  */
 129                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 130                         return Title::$titleCache[$text];
 131                 }
 132
 133                 /**
 134                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 135                  */
 136                 $filteredText = Sanitizer::decodeCharReferences( $text );
 137
 138                 $t = new Title();
 139                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 140                 $t->mDefaultNamespace = $defaultNamespace;
 141
 142                 static $cachedcount = 0 ;
 143                 if( $t->secureAndSplit() ) {
 144                         if( $defaultNamespace == NS_MAIN ) {
 145                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 146                                         # Avoid memory leaks on mass operations...
 147                                         Title::$titleCache = array();
 148                                         $cachedcount=0;
 149                                 }
 150                                 $cachedcount++;
 151                                 Title::$titleCache[$text] =& $t;
 152                         }
 153                         return $t;
 154                 } else {
 155                         $ret = NULL;
 156                         return $ret;
 157                 }
 158         }
 159
 160         /**
 161          * Create a new Title from URL-encoded text. Ensures that
 162          * the given title's length does not exceed the maximum.
 163          * @param string $url the title, as might be taken from a URL
 164          * @return Title the new object, or NULL on an error
 165          * @static
 166          * @access public
 167          */
 168         public static function newFromURL( $url ) {
 169                 global $wgLegalTitleChars;
 170                 $t = new Title();
 171
 172                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 173                 # but some URLs used it as a space replacement and they still come
 174                 # from some external search tools.
 175                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 176                         $url = str_replace( '+', ' ', $url );
 177                 }
 178
 179                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 180                 if( $t->secureAndSplit() ) {
 181                         return $t;
 182                 } else {
 183                         return NULL;
 184                 }
 185         }
 186
 187         /**
 188          * Create a new Title from an article ID
 189          *
 190          * @todo This is inefficiently implemented, the page row is requested
 191          *       but not used for anything else
 192          *
 193          * @param int $id the page_id corresponding to the Title to create
 194          * @return Title the new object, or NULL on an error
 195          * @access public
 196          * @static
 197          */
 198         public static function newFromID( $id ) {
 199                 $fname = 'Title::newFromID';
 200                 $dbr =& wfGetDB( DB_SLAVE );
 201                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 202                         array( 'page_id' => $id ), $fname );
 203                 if ( $row !== false ) {
 204                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 205                 } else {
 206                         $title = NULL;
 207                 }
 208                 return $title;
 209         }
 210
 211         /**
 212          * Make an array of titles from an array of IDs
 213          */
 214         function newFromIDs( $ids ) {
 215                 $dbr =& wfGetDB( DB_SLAVE );
 216                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 217                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 218
 219                 $titles = array();
 220                 while ( $row = $dbr->fetchObject( $res ) ) {
 221                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 222                 }
 223                 return $titles;
 224         }
 225
 226         /**
 227          * Create a new Title from a namespace index and a DB key.
 228          * It's assumed that $ns and $title are *valid*, for instance when
 229          * they came directly from the database or a special page name.
 230          * For convenience, spaces are converted to underscores so that
 231          * eg user_text fields can be used directly.
 232          *
 233          * @param int $ns the namespace of the article
 234          * @param string $title the unprefixed database key form
 235          * @return Title the new object
 236          * @static
 237          * @access public
 238          */
 239         public static function &makeTitle( $ns, $title ) {
 240                 $t = new Title();
 241                 $t->mInterwiki = '';
 242                 $t->mFragment = '';
 243                 $t->mNamespace = intval( $ns );
 244                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 245                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 246                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 247                 $t->mTextform = str_replace( '_', ' ', $title );
 248                 return $t;
 249         }
 250
 251         /**
 252          * Create a new Title from a namespace index and a DB key.
 253          * The parameters will be checked for validity, which is a bit slower
 254          * than makeTitle() but safer for user-provided data.
 255          *
 256          * @param int $ns the namespace of the article
 257          * @param string $title the database key form
 258          * @return Title the new object, or NULL on an error
 259          * @static
 260          * @access public
 261          */
 262         public static function makeTitleSafe( $ns, $title ) {
 263                 $t = new Title();
 264                 $t->mDbkeyform = Title::makeName( $ns, $title );
 265                 if( $t->secureAndSplit() ) {
 266                         return $t;
 267                 } else {
 268                         return NULL;
 269                 }
 270         }
 271
 272         /**
 273          * Create a new Title for the Main Page
 274          *
 275          * @static
 276          * @return Title the new object
 277          * @access public
 278          */
 279         public static function newMainPage() {
 280                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 281         }
 282
 283         /**
 284          * Create a new Title for a redirect
 285          * @param string $text the redirect title text
 286          * @return Title the new object, or NULL if the text is not a
 287          *      valid redirect
 288          */
 289         public static function newFromRedirect( $text ) {
 290                 $mwRedir = MagicWord::get( 'redirect' );
 291                 $rt = NULL;
 292                 if ( $mwRedir->matchStart( $text ) ) {
 293                         $m = array();
 294                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 295                                 # categories are escaped using : for example one can enter:
 296                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 297                                 if ( substr($m[1],0,1) == ':') {
 298                                         # We don't want to keep the ':'
 299                                         $m[1] = substr( $m[1], 1 );
 300                                 }
 301
 302                                 $rt = Title::newFromText( $m[1] );
 303                                 # Disallow redirects to Special:Userlogout
 304                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 305                                         $rt = NULL;
 306                                 }
 307                         }
 308                 }
 309                 return $rt;
 310         }
 311
 312 #----------------------------------------------------------------------------
 313 #       Static functions
 314 #----------------------------------------------------------------------------
 315
 316         /**
 317          * Get the prefixed DB key associated with an ID
 318          * @param int $id the page_id of the article
 319          * @return Title an object representing the article, or NULL
 320          *      if no such article was found
 321          * @static
 322          * @access public
 323          */
 324         function nameOf( $id ) {
 325                 $fname = 'Title::nameOf';
 326                 $dbr =& wfGetDB( DB_SLAVE );
 327
 328                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 329                 if ( $s === false ) { return NULL; }
 330
 331                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 332                 return $n;
 333         }
 334
 335         /**
 336          * Get a regex character class describing the legal characters in a link
 337          * @return string the list of characters, not delimited
 338          * @static
 339          * @access public
 340          */
 341         public static function legalChars() {
 342                 global $wgLegalTitleChars;
 343                 return $wgLegalTitleChars;
 344         }
 345
 346         /**
 347          * Get a string representation of a title suitable for
 348          * including in a search index
 349          *
 350          * @param int $ns a namespace index
 351          * @param string $title text-form main part
 352          * @return string a stripped-down title string ready for the
 353          *      search index
 354          */
 355         public static function indexTitle( $ns, $title ) {
 356                 global $wgContLang;
 357
 358                 $lc = SearchEngine::legalSearchChars() . '&#;';
 359                 $t = $wgContLang->stripForSearch( $title );
 360                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 361                 $t = $wgContLang->lc( $t );
 362
 363                 # Handle 's, s'
 364                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 365                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 366
 367                 $t = preg_replace( "/\\s+/", ' ', $t );
 368
 369                 if ( $ns == NS_IMAGE ) {
 370                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 371                 }
 372                 return trim( $t );
 373         }
 374
 375         /*
 376          * Make a prefixed DB key from a DB key and a namespace index
 377          * @param int $ns numerical representation of the namespace
 378          * @param string $title the DB key form the title
 379          * @return string the prefixed form of the title
 380          */
 381         public static function makeName( $ns, $title ) {
 382                 global $wgContLang;
 383
 384                 $n = $wgContLang->getNsText( $ns );
 385                 return $n == '' ? $title : "$n:$title";
 386         }
 387
 388         /**
 389          * Returns the URL associated with an interwiki prefix
 390          * @param string $key the interwiki prefix (e.g. "MeatBall")
 391          * @return the associated URL, containing "$1", which should be
 392          *      replaced by an article title
 393          * @static (arguably)
 394          * @access public
 395          */
 396         function getInterwikiLink( $key )  {
 397                 global $wgMemc, $wgInterwikiExpiry;
 398                 global $wgInterwikiCache, $wgContLang;
 399                 $fname = 'Title::getInterwikiLink';
 400
 401                 $key = $wgContLang->lc( $key );
 402
 403                 $k = wfMemcKey( 'interwiki', $key );
 404                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 405                         return Title::$interwikiCache[$k]->iw_url;
 406                 }
 407
 408                 if ($wgInterwikiCache) {
 409                         return Title::getInterwikiCached( $key );
 410                 }
 411
 412                 $s = $wgMemc->get( $k );
 413                 # Ignore old keys with no iw_local
 414                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 415                         Title::$interwikiCache[$k] = $s;
 416                         return $s->iw_url;
 417                 }
 418
 419                 $dbr =& wfGetDB( DB_SLAVE );
 420                 $res = $dbr->select( 'interwiki',
 421                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 422                         array( 'iw_prefix' => $key ), $fname );
 423                 if( !$res ) {
 424                         return '';
 425                 }
 426
 427                 $s = $dbr->fetchObject( $res );
 428                 if( !$s ) {
 429                         # Cache non-existence: create a blank object and save it to memcached
 430                         $s = (object)false;
 431                         $s->iw_url = '';
 432                         $s->iw_local = 0;
 433                         $s->iw_trans = 0;
 434                 }
 435                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 436                 Title::$interwikiCache[$k] = $s;
 437
 438                 return $s->iw_url;
 439         }
 440
 441         /**
 442          * Fetch interwiki prefix data from local cache in constant database
 443          *
 444          * More logic is explained in DefaultSettings
 445          *
 446          * @return string URL of interwiki site
 447          * @access public
 448          */
 449         function getInterwikiCached( $key ) {
 450                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 451                 static $db, $site;
 452
 453                 if (!$db)
 454                         $db=dba_open($wgInterwikiCache,'r','cdb');
 455                 /* Resolve site name */
 456                 if ($wgInterwikiScopes>=3 and !$site) {
 457                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 458                         if ($site=="")
 459                                 $site = $wgInterwikiFallbackSite;
 460                 }
 461                 $value = dba_fetch( wfMemcKey( $key ), $db);
 462                 if ($value=='' and $wgInterwikiScopes>=3) {
 463                         /* try site-level */
 464                         $value = dba_fetch("_{$site}:{$key}", $db);
 465                 }
 466                 if ($value=='' and $wgInterwikiScopes>=2) {
 467                         /* try globals */
 468                         $value = dba_fetch("__global:{$key}", $db);
 469                 }
 470                 if ($value=='undef')
 471                         $value='';
 472                 $s = (object)false;
 473                 $s->iw_url = '';
 474                 $s->iw_local = 0;
 475                 $s->iw_trans = 0;
 476                 if ($value!='') {
 477                         list($local,$url)=explode(' ',$value,2);
 478                         $s->iw_url=$url;
 479                         $s->iw_local=(int)$local;
 480                 }
 481                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 482                 return $s->iw_url;
 483         }
 484         /**
 485          * Determine whether the object refers to a page within
 486          * this project.
 487          *
 488          * @return bool TRUE if this is an in-project interwiki link
 489          *      or a wikilink, FALSE otherwise
 490          * @access public
 491          */
 492         function isLocal() {
 493                 if ( $this->mInterwiki != '' ) {
 494                         # Make sure key is loaded into cache
 495                         $this->getInterwikiLink( $this->mInterwiki );
 496                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 497                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 498                 } else {
 499                         return true;
 500                 }
 501         }
 502
 503         /**
 504          * Determine whether the object refers to a page within
 505          * this project and is transcludable.
 506          *
 507          * @return bool TRUE if this is transcludable
 508          * @access public
 509          */
 510         function isTrans() {
 511                 if ($this->mInterwiki == '')
 512                         return false;
 513                 # Make sure key is loaded into cache
 514                 $this->getInterwikiLink( $this->mInterwiki );
 515                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 516                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 517         }
 518
 519         /**
 520          * Update the page_touched field for an array of title objects
 521          * @todo Inefficient unless the IDs are already loaded into the
 522          *      link cache
 523          * @param array $titles an array of Title objects to be touched
 524          * @param string $timestamp the timestamp to use instead of the
 525          *      default current time
 526          * @static
 527          * @access public
 528          */
 529         function touchArray( $titles, $timestamp = '' ) {
 530
 531                 if ( count( $titles ) == 0 ) {
 532                         return;
 533                 }
 534                 $dbw =& wfGetDB( DB_MASTER );
 535                 if ( $timestamp == '' ) {
 536                         $timestamp = $dbw->timestamp();
 537                 }
 538                 /*
 539                 $page = $dbw->tableName( 'page' );
 540                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 541                 $first = true;
 542
 543                 foreach ( $titles as $title ) {
 544                         if ( $wgUseFileCache ) {
 545                                 $cm = new HTMLFileCache($title);
 546                                 @unlink($cm->fileCacheName());
 547                         }
 548
 549                         if ( ! $first ) {
 550                                 $sql .= ',';
 551                         }
 552                         $first = false;
 553                         $sql .= $title->getArticleID();
 554                 }
 555                 $sql .= ')';
 556                 if ( ! $first ) {
 557                         $dbw->query( $sql, 'Title::touchArray' );
 558                 }
 559                 */
 560                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 561                 // do them in small chunks:
 562                 $fname = 'Title::touchArray';
 563                 foreach( $titles as $title ) {
 564                         $dbw->update( 'page',
 565                                 array( 'page_touched' => $timestamp ),
 566                                 array(
 567                                         'page_namespace' => $title->getNamespace(),
 568                                         'page_title'     => $title->getDBkey() ),
 569                                 $fname );
 570                 }
 571         }
 572
 573         /**
 574          * Escape a text fragment, say from a link, for a URL
 575          */
 576         static function escapeFragmentForURL( $fragment ) {
 577                 $fragment = str_replace( ' ', '_', $fragment );
 578                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 579                 $replaceArray = array(
 580                         '%3A' => ':',
 581                         '%' => '.'
 582                 );
 583                 return strtr( $fragment, $replaceArray );
 584         }
 585
 586 #----------------------------------------------------------------------------
 587 #       Other stuff
 588 #----------------------------------------------------------------------------
 589
 590         /** Simple accessors */
 591         /**
 592          * Get the text form (spaces not underscores) of the main part
 593          * @return string
 594          * @access public
 595          */
 596         function getText() { return $this->mTextform; }
 597         /**
 598          * Get the URL-encoded form of the main part
 599          * @return string
 600          * @access public
 601          */
 602         function getPartialURL() { return $this->mUrlform; }
 603         /**
 604          * Get the main part with underscores
 605          * @return string
 606          * @access public
 607          */
 608         function getDBkey() { return $this->mDbkeyform; }
 609         /**
 610          * Get the namespace index, i.e. one of the NS_xxxx constants
 611          * @return int
 612          * @access public
 613          */
 614         function getNamespace() { return $this->mNamespace; }
 615         /**
 616          * Get the namespace text
 617          * @return string
 618          * @access public
 619          */
 620         function getNsText() {
 621                 global $wgContLang, $wgCanonicalNamespaceNames;
 622
 623                 if ( '' != $this->mInterwiki ) {
 624                         // This probably shouldn't even happen. ohh man, oh yuck.
 625                         // But for interwiki transclusion it sometimes does.
 626                         // Shit. Shit shit shit.
 627                         //
 628                         // Use the canonical namespaces if possible to try to
 629                         // resolve a foreign namespace.
 630                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 631                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 632                         }
 633                 }
 634                 return $wgContLang->getNsText( $this->mNamespace );
 635         }
 636         /**
 637          * Get the namespace text of the subject (rather than talk) page
 638          * @return string
 639          * @access public
 640          */
 641         function getSubjectNsText() {
 642                 global $wgContLang;
 643                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 644         }
 645
 646         /**
 647          * Get the namespace text of the talk page
 648          * @return string
 649          */
 650         function getTalkNsText() {
 651                 global $wgContLang;
 652                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 653         }
 654
 655         /**
 656          * Could this title have a corresponding talk page?
 657          * @return bool
 658          */
 659         function canTalk() {
 660                 return( Namespace::canTalk( $this->mNamespace ) );
 661         }
 662
 663         /**
 664          * Get the interwiki prefix (or null string)
 665          * @return string
 666          * @access public
 667          */
 668         function getInterwiki() { return $this->mInterwiki; }
 669         /**
 670          * Get the Title fragment (i.e. the bit after the #) in text form
 671          * @return string
 672          * @access public
 673          */
 674         function getFragment() { return $this->mFragment; }
 675         /**
 676          * Get the fragment in URL form, including the "#" character if there is one
 677          *
 678          * @return string
 679          * @access public
 680          */
 681         function getFragmentForURL() {
 682                 if ( $this->mFragment == '' ) {
 683                         return '';
 684                 } else {
 685                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 686                 }
 687         }
 688         /**
 689          * Get the default namespace index, for when there is no namespace
 690          * @return int
 691          * @access public
 692          */
 693         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 694
 695         /**
 696          * Get title for search index
 697          * @return string a stripped-down title string ready for the
 698          *      search index
 699          */
 700         function getIndexTitle() {
 701                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 702         }
 703
 704         /**
 705          * Get the prefixed database key form
 706          * @return string the prefixed title, with underscores and
 707          *      any interwiki and namespace prefixes
 708          * @access public
 709          */
 710         function getPrefixedDBkey() {
 711                 $s = $this->prefix( $this->mDbkeyform );
 712                 $s = str_replace( ' ', '_', $s );
 713                 return $s;
 714         }
 715
 716         /**
 717          * Get the prefixed title with spaces.
 718          * This is the form usually used for display
 719          * @return string the prefixed title, with spaces
 720          * @access public
 721          */
 722         function getPrefixedText() {
 723                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 724                         $s = $this->prefix( $this->mTextform );
 725                         $s = str_replace( '_', ' ', $s );
 726                         $this->mPrefixedText = $s;
 727                 }
 728                 return $this->mPrefixedText;
 729         }
 730
 731         /**
 732          * Get the prefixed title with spaces, plus any fragment
 733          * (part beginning with '#')
 734          * @return string the prefixed title, with spaces and
 735          *      the fragment, including '#'
 736          * @access public
 737          */
 738         function getFullText() {
 739                 $text = $this->getPrefixedText();
 740                 if( '' != $this->mFragment ) {
 741                         $text .= '#' . $this->mFragment;
 742                 }
 743                 return $text;
 744         }
 745
 746         /**
 747          * Get the base name, i.e. the leftmost parts before the /
 748          * @return string Base name
 749          */
 750         function getBaseText() {
 751                 global $wgNamespacesWithSubpages;
 752                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 753                         $parts = explode( '/', $this->getText() );
 754                         # Don't discard the real title if there's no subpage involved
 755                         if( count( $parts ) > 1 )
 756                                 unset( $parts[ count( $parts ) - 1 ] );
 757                         return implode( '/', $parts );
 758                 } else {
 759                         return $this->getText();
 760                 }
 761         }
 762
 763         /**
 764          * Get the lowest-level subpage name, i.e. the rightmost part after /
 765          * @return string Subpage name
 766          */
 767         function getSubpageText() {
 768                 global $wgNamespacesWithSubpages;
 769                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 770                         $parts = explode( '/', $this->mTextform );
 771                         return( $parts[ count( $parts ) - 1 ] );
 772                 } else {
 773                         return( $this->mTextform );
 774                 }
 775         }
 776
 777         /**
 778          * Get a URL-encoded form of the subpage text
 779          * @return string URL-encoded subpage name
 780          */
 781         function getSubpageUrlForm() {
 782                 $text = $this->getSubpageText();
 783                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 784                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 785                 return( $text );
 786         }
 787
 788         /**
 789          * Get a URL-encoded title (not an actual URL) including interwiki
 790          * @return string the URL-encoded form
 791          * @access public
 792          */
 793         function getPrefixedURL() {
 794                 $s = $this->prefix( $this->mDbkeyform );
 795                 $s = str_replace( ' ', '_', $s );
 796
 797                 $s = wfUrlencode ( $s ) ;
 798
 799                 # Cleaning up URL to make it look nice -- is this safe?
 800                 $s = str_replace( '%28', '(', $s );
 801                 $s = str_replace( '%29', ')', $s );
 802
 803                 return $s;
 804         }
 805
 806         /**
 807          * Get a real URL referring to this title, with interwiki link and
 808          * fragment
 809          *
 810          * @param string $query an optional query string, not used
 811          *      for interwiki links
 812          * @param string $variant language variant of url (for sr, zh..)
 813          * @return string the URL
 814          * @access public
 815          */
 816         function getFullURL( $query = '', $variant = false ) {
 817                 global $wgContLang, $wgServer, $wgRequest;
 818
 819                 if ( '' == $this->mInterwiki ) {
 820                         $url = $this->getLocalUrl( $query, $variant );
 821
 822                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 823                         // Correct fix would be to move the prepending elsewhere.
 824                         if ($wgRequest->getVal('action') != 'render') {
 825                                 $url = $wgServer . $url;
 826                         }
 827                 } else {
 828                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 829
 830                         $namespace = wfUrlencode( $this->getNsText() );
 831                         if ( '' != $namespace ) {
 832                                 # Can this actually happen? Interwikis shouldn't be parsed.
 833                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 834                                 $namespace .= ':';
 835                         }
 836                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 837                         if( $query != '' ) {
 838                                 if( false === strpos( $url, '?' ) ) {
 839                                         $url .= '?';
 840                                 } else {
 841                                         $url .= '&';
 842                                 }
 843                                 $url .= $query;
 844                         }
 845                 }
 846
 847                 # Finally, add the fragment.
 848                 $url .= $this->getFragmentForURL();
 849
 850                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 851                 return $url;
 852         }
 853
 854         /**
 855          * Get a URL with no fragment or server name.  If this page is generated
 856          * with action=render, $wgServer is prepended.
 857          * @param string $query an optional query string; if not specified,
 858          *      $wgArticlePath will be used.
 859          * @param string $variant language variant of url (for sr, zh..)
 860          * @return string the URL
 861          * @access public
 862          */
 863         function getLocalURL( $query = '', $variant = false ) {
 864                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 865                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 866
 867                 // internal links should point to same variant as current page (only anonymous users)
 868                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 869                         $pref = $wgContLang->getPreferredVariant(false);
 870                         if($pref != $wgContLang->getCode())
 871                                 $variant = $pref;
 872                 }
 873
 874                 if ( $this->isExternal() ) {
 875                         $url = $this->getFullURL();
 876                         if ( $query ) {
 877                                 // This is currently only used for edit section links in the
 878                                 // context of interwiki transclusion. In theory we should
 879                                 // append the query to the end of any existing query string,
 880                                 // but interwiki transclusion is already broken in that case.
 881                                 $url .= "?$query";
 882                         }
 883                 } else {
 884                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 885                         if ( $query == '' ) {
 886                                 if($variant!=false && $wgContLang->hasVariants()){
 887                                         if($wgVariantArticlePath==false)
 888                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 889                                         else
 890                                                 $variantArticlePath = $wgVariantArticlePath;
 891
 892                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 893                                         $url = str_replace( '$1', $dbkey, $url  );
 894
 895                                 }
 896                                 else
 897                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 898                         } else {
 899                                 global $wgActionPaths;
 900                                 $url = false;
 901                                 $matches = array();
 902                                 if( !empty( $wgActionPaths ) &&
 903                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 904                                 {
 905                                         $action = urldecode( $matches[2] );
 906                                         if( isset( $wgActionPaths[$action] ) ) {
 907                                                 $query = $matches[1];
 908                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 909                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 910                                                 if( $query != '' ) $url .= '?' . $query;
 911                                         }
 912                                 }
 913                                 if ( $url === false ) {
 914                                         if ( $query == '-' ) {
 915                                                 $query = '';
 916                                         }
 917                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 918                                 }
 919                         }
 920
 921                         // FIXME: this causes breakage in various places when we
 922                         // actually expected a local URL and end up with dupe prefixes.
 923                         if ($wgRequest->getVal('action') == 'render') {
 924                                 $url = $wgServer . $url;
 925                         }
 926                 }
 927                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 928                 return $url;
 929         }
 930
 931         /**
 932          * Get an HTML-escaped version of the URL form, suitable for
 933          * using in a link, without a server name or fragment
 934          * @param string $query an optional query string
 935          * @return string the URL
 936          * @access public
 937          */
 938         function escapeLocalURL( $query = '' ) {
 939                 return htmlspecialchars( $this->getLocalURL( $query ) );
 940         }
 941
 942         /**
 943          * Get an HTML-escaped version of the URL form, suitable for
 944          * using in a link, including the server name and fragment
 945          *
 946          * @return string the URL
 947          * @param string $query an optional query string
 948          * @access public
 949          */
 950         function escapeFullURL( $query = '' ) {
 951                 return htmlspecialchars( $this->getFullURL( $query ) );
 952         }
 953
 954         /**
 955          * Get the URL form for an internal link.
 956          * - Used in various Squid-related code, in case we have a different
 957          * internal hostname for the server from the exposed one.
 958          *
 959          * @param string $query an optional query string
 960          * @param string $variant language variant of url (for sr, zh..)
 961          * @return string the URL
 962          * @access public
 963          */
 964         function getInternalURL( $query = '', $variant = false ) {
 965                 global $wgInternalServer;
 966                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 967                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 968                 return $url;
 969         }
 970
 971         /**
 972          * Get the edit URL for this Title
 973          * @return string the URL, or a null string if this is an
 974          *      interwiki link
 975          * @access public
 976          */
 977         function getEditURL() {
 978                 if ( '' != $this->mInterwiki ) { return ''; }
 979                 $s = $this->getLocalURL( 'action=edit' );
 980
 981                 return $s;
 982         }
 983
 984         /**
 985          * Get the HTML-escaped displayable text form.
 986          * Used for the title field in <a> tags.
 987          * @return string the text, including any prefixes
 988          * @access public
 989          */
 990         function getEscapedText() {
 991                 return htmlspecialchars( $this->getPrefixedText() );
 992         }
 993
 994         /**
 995          * Is this Title interwiki?
 996          * @return boolean
 997          * @access public
 998          */
 999         function isExternal() { return ( '' != $this->mInterwiki ); }
1000
1001         /**
1002          * Is this page "semi-protected" - the *only* protection is autoconfirm?
1003          *
1004          * @param string Action to check (default: edit)
1005          * @return bool
1006          */
1007         function isSemiProtected( $action = 'edit' ) {
1008                 if( $this->exists() ) {
1009                         $restrictions = $this->getRestrictions( $action );
1010                         if( count( $restrictions ) > 0 ) {
1011                                 foreach( $restrictions as $restriction ) {
1012                                         if( strtolower( $restriction ) != 'autoconfirmed' )
1013                                                 return false;
1014                                 }
1015                         } else {
1016                                 # Not protected
1017                                 return false;
1018                         }
1019                         return true;
1020                 } else {
1021                         # If it doesn't exist, it can't be protected
1022                         return false;
1023                 }
1024         }
1025
1026         /**
1027          * Does the title correspond to a protected article?
1028          * @param string $what the action the page is protected from,
1029          *      by default checks move and edit
1030          * @return boolean
1031          * @access public
1032          */
1033         function isProtected( $action = '' ) {
1034                 global $wgRestrictionLevels;
1035
1036                 # Special pages have inherent protection
1037                 if( $this->getNamespace() == NS_SPECIAL )
1038                         return true;
1039
1040                 # Cascading protection depends on more than
1041                 # this page...
1042                 if( $this->isCascadeProtected() )
1043                         return true;
1044
1045                 # Check regular protection levels
1046                 if( $action == 'edit' || $action == '' ) {
1047                         $r = $this->getRestrictions( 'edit' );
1048                         foreach( $wgRestrictionLevels as $level ) {
1049                                 if( in_array( $level, $r ) && $level != '' ) {
1050                                         return( true );
1051                                 }
1052                         }
1053                 }
1054
1055                 if( $action == 'move' || $action == '' ) {
1056                         $r = $this->getRestrictions( 'move' );
1057                         foreach( $wgRestrictionLevels as $level ) {
1058                                 if( in_array( $level, $r ) && $level != '' ) {
1059                                         return( true );
1060                                 }
1061                         }
1062                 }
1063
1064                 return false;
1065         }
1066
1067         /**
1068          * Is $wgUser is watching this page?
1069          * @return boolean
1070          * @access public
1071          */
1072         function userIsWatching() {
1073                 global $wgUser;
1074
1075                 if ( is_null( $this->mWatched ) ) {
1076                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1077                                 $this->mWatched = false;
1078                         } else {
1079                                 $this->mWatched = $wgUser->isWatched( $this );
1080                         }
1081                 }
1082                 return $this->mWatched;
1083         }
1084
1085         /**
1086          * Can $wgUser perform $action on this page?
1087          * This skips potentially expensive cascading permission checks.
1088          *
1089          * Suitable for use for nonessential UI controls in common cases, but
1090          * _not_ for functional access control.
1091          *
1092          * May provide false positives, but should never provide a false negative.
1093          *
1094          * @param string $action action that permission needs to be checked for
1095          * @return boolean
1096          */
1097         public function quickUserCan( $action ) {
1098                 return $this->userCan( $action, false );
1099         }
1100
1101         /**
1102          * Can $wgUser perform $action on this page?
1103          * @param string $action action that permission needs to be checked for
1104          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1105          * @return boolean
1106          */
1107         public function userCan( $action, $doExpensiveQueries = true ) {
1108                 $fname = 'Title::userCan';
1109                 wfProfileIn( $fname );
1110
1111                 global $wgUser, $wgNamespaceProtection;
1112
1113                 $result = null;
1114                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1115                 if ( $result !== null ) {
1116                         wfProfileOut( $fname );
1117                         return $result;
1118                 }
1119
1120                 if( NS_SPECIAL == $this->mNamespace ) {
1121                         wfProfileOut( $fname );
1122                         return false;
1123                 }
1124
1125                 if ( array_key_exists( $this->mNamespace, $wgNamespaceProtection ) ) {
1126                         $nsProt = $wgNamespaceProtection[ $this->mNamespace ];
1127                         if ( !is_array($nsProt) ) $nsProt = array($nsProt);
1128                         foreach( $nsProt as $right ) {
1129                                 if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1130                                         wfProfileOut( $fname );
1131                                         return false;
1132                                 }
1133                         }
1134                 }
1135
1136                 if( $this->mDbkeyform == '_' ) {
1137                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1138                         wfProfileOut( $fname );
1139                         return false;
1140                 }
1141
1142                 # protect css/js subpages of user pages
1143                 # XXX: this might be better using restrictions
1144                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1145                 if( $this->isCssJsSubpage()
1146                         && !$wgUser->isAllowed('editinterface')
1147                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1148                         wfProfileOut( $fname );
1149                         return false;
1150                 }
1151
1152                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() && $this->isCascadeProtected() ) {
1153                         # We /could/ use the protection level on the source page, but it's fairly ugly
1154                         #  as we have to establish a precedence hierarchy for pages included by multiple
1155                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1156                         #  as they could remove the protection anyway.
1157                         if ( !$wgUser->isAllowed('protect') ) {
1158                                 wfProfileOut( $fname );
1159                                 return false;
1160                         }
1161                 }
1162
1163                 foreach( $this->getRestrictions($action) as $right ) {
1164                         // Backwards compatibility, rewrite sysop -> protect
1165                         if ( $right == 'sysop' ) {
1166                                 $right = 'protect';
1167                         }
1168                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1169                                 wfProfileOut( $fname );
1170                                 return false;
1171                         }
1172                 }
1173
1174                 if( $action == 'move' &&
1175                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1176                         wfProfileOut( $fname );
1177                         return false;
1178                 }
1179
1180                 if( $action == 'create' ) {
1181                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1182                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1183                                 wfProfileOut( $fname );
1184                                 return false;
1185                         }
1186                 }
1187
1188                 wfProfileOut( $fname );
1189                 return true;
1190         }
1191
1192         /**
1193          * Can $wgUser edit this page?
1194          * @return boolean
1195          * @deprecated use userCan('edit')
1196          */
1197         public function userCanEdit( $doExpensiveQueries = true ) {
1198                 return $this->userCan( 'edit', $doExpensiveQueries );
1199         }
1200
1201         /**
1202          * Can $wgUser create this page?
1203          * @return boolean
1204          * @deprecated use userCan('create')
1205          */
1206         public function userCanCreate( $doExpensiveQueries = true ) {
1207                 return $this->userCan( 'create', $doExpensiveQueries );
1208         }
1209
1210         /**
1211          * Can $wgUser move this page?
1212          * @return boolean
1213          * @deprecated use userCan('move')
1214          */
1215         public function userCanMove( $doExpensiveQueries = true ) {
1216                 return $this->userCan( 'move', $doExpensiveQueries );
1217         }
1218
1219         /**
1220          * Would anybody with sufficient privileges be able to move this page?
1221          * Some pages just aren't movable.
1222          *
1223          * @return boolean
1224          * @access public
1225          */
1226         function isMovable() {
1227                 return Namespace::isMovable( $this->getNamespace() )
1228                         && $this->getInterwiki() == '';
1229         }
1230
1231         /**
1232          * Can $wgUser read this page?
1233          * @return boolean
1234          * @fixme fold these checks into userCan()
1235          */
1236         public function userCanRead() {
1237                 global $wgUser;
1238
1239                 $result = null;
1240                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1241                 if ( $result !== null ) {
1242                         return $result;
1243                 }
1244
1245                 if( $wgUser->isAllowed('read') ) {
1246                         return true;
1247                 } else {
1248                         global $wgWhitelistRead;
1249
1250                         /**
1251                          * Always grant access to the login page.
1252                          * Even anons need to be able to log in.
1253                         */
1254                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1255                                 return true;
1256                         }
1257
1258                         /** some pages are explicitly allowed */
1259                         $name = $this->getPrefixedText();
1260                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1261                                 return true;
1262                         }
1263
1264                         # Compatibility with old settings
1265                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1266                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1267                                         return true;
1268                                 }
1269                         }
1270                 }
1271                 return false;
1272         }
1273
1274         /**
1275          * Is this a talk page of some sort?
1276          * @return bool
1277          * @access public
1278          */
1279         function isTalkPage() {
1280                 return Namespace::isTalk( $this->getNamespace() );
1281         }
1282
1283         /**
1284          * Is this a subpage?
1285          * @return bool
1286          * @access public
1287          */
1288         function isSubpage() {
1289                 global $wgNamespacesWithSubpages;
1290
1291                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1292                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1293                 } else {
1294                         return false;
1295                 }
1296         }
1297
1298         /**
1299          * Is this a .css or .js subpage of a user page?
1300          * @return bool
1301          * @access public
1302          */
1303         function isCssJsSubpage() {
1304                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(css|js)$/", $this->mTextform ) );
1305         }
1306         /**
1307          * Is this a *valid* .css or .js subpage of a user page?
1308          * Check that the corresponding skin exists
1309          */
1310         function isValidCssJsSubpage() {
1311                 if ( $this->isCssJsSubpage() ) {
1312                         $skinNames = Skin::getSkinNames();
1313                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1314                 } else {
1315                         return false;
1316                 }
1317         }
1318         /**
1319          * Trim down a .css or .js subpage title to get the corresponding skin name
1320          */
1321         function getSkinFromCssJsSubpage() {
1322                 $subpage = explode( '/', $this->mTextform );
1323                 $subpage = $subpage[ count( $subpage ) - 1 ];
1324                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1325         }
1326         /**
1327          * Is this a .css subpage of a user page?
1328          * @return bool
1329          * @access public
1330          */
1331         function isCssSubpage() {
1332                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1333         }
1334         /**
1335          * Is this a .js subpage of a user page?
1336          * @return bool
1337          * @access public
1338          */
1339         function isJsSubpage() {
1340                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1341         }
1342         /**
1343          * Protect css/js subpages of user pages: can $wgUser edit
1344          * this page?
1345          *
1346          * @return boolean
1347          * @todo XXX: this might be better using restrictions
1348          * @access public
1349          */
1350         function userCanEditCssJsSubpage() {
1351                 global $wgUser;
1352                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1353         }
1354
1355         /**
1356          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1357          *
1358          * @return bool If the page is subject to cascading restrictions.
1359          * @access public.
1360          */
1361         function isCascadeProtected() {
1362                 return ( $this->getCascadeProtectionSources( false ) );
1363         }
1364
1365         /**
1366          * Cascading protection: Get the source of any cascading restrictions on this page.
1367          *
1368          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1369          * @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.
1370          * @access public
1371          */
1372         function getCascadeProtectionSources( $get_pages = true ) {
1373                 global $wgEnableCascadingProtection;
1374                 if (!$wgEnableCascadingProtection)
1375                         return false;
1376
1377                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1378                         return $this->mCascadeSources;
1379                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1380                         return $this->mHasCascadingRestrictions;
1381                 }
1382
1383                 wfProfileIn( __METHOD__ );
1384
1385                 $dbr =& wfGetDb( DB_SLAVE );
1386
1387                 if ( $this->getNamespace() == NS_IMAGE ) {
1388                         $cols = $get_pages ? array('pr_page', 'page_namespace', 'page_title') : array( '1' );
1389                         $tables = array ('imagelinks', 'page_restrictions');
1390                         $where_clauses = array( 'il_to' => $this->getDBkey(), 'il_from=pr_page', 'pr_cascade' => 1 );
1391                 } else {
1392                         $cols = $get_pages ? array( 'pr_page', 'page_namespace', 'page_title' ) : array( '1' );
1393                         $tables = array ('templatelinks', 'page_restrictions');
1394                         $where_clauses = array( 'tl_namespace' => $this->getNamespace(), 'tl_title' => $this->getDBkey(), 'tl_from=pr_page', 'pr_cascade' => 1 );
1395                 }
1396
1397                 $options = array ();
1398
1399                 if ( $get_pages ) {
1400                         $where_clauses[] = 'page_id=pr_page';
1401                         $tables[] = 'page';
1402                 } else {
1403                         $options[] = "LIMIT 1";
1404                 }
1405
1406                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__, $options);
1407
1408                 if ($dbr->numRows($res)) {
1409                         if ($get_pages) {
1410                                 $sources = array ();
1411                                 while ($row = $dbr->fetchObject($res)) {
1412                                         $page_id = $row->pr_page;
1413                                         $page_ns = $row->page_namespace;
1414                                         $page_title = $row->page_title;
1415                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1416                                 }
1417                         } else {
1418                                 $sources = true;
1419                         }
1420                 } else {
1421                         $sources = false;
1422                 }
1423
1424                 wfProfileOut( __METHOD__ );
1425
1426                 if ( $get_pages ) {
1427                         $this->mCascadeSources = $sources;
1428                 } else {
1429                         $this->mHasCascadingRestrictions = $sources;
1430                 }
1431
1432                 return $sources;
1433         }
1434
1435         function areRestrictionsCascading() {
1436                 if (!$this->mRestrictionsLoaded) {
1437                         $this->loadRestrictions();
1438                 }
1439
1440                 return $this->mCascadeRestriction;
1441         }
1442
1443         /**
1444          * Loads a string into mRestrictions array
1445          * @param resource $res restrictions as an SQL result.
1446          * @access public
1447          */
1448         function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1449                 $dbr =& wfGetDb( DB_SLAVE );
1450
1451                 $this->mRestrictions['edit'] = array();
1452                 $this->mRestrictions['move'] = array();
1453
1454                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1455
1456                 if ( $oldFashionedRestrictions == NULL ) {
1457                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1458                 }
1459
1460                 if ($oldFashionedRestrictions != '') {
1461
1462                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1463                                 $temp = explode( '=', trim( $restrict ) );
1464                                 if(count($temp) == 1) {
1465                                         // old old format should be treated as edit/move restriction
1466                                         $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1467                                         $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1468                                 } else {
1469                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1470                                 }
1471                         }
1472
1473                         $this->mOldRestrictions = true;
1474                         $this->mCascadeRestriction = false;
1475                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1476
1477                 }
1478
1479                 if ($dbr->numRows( $res) ) {
1480                         # Current system - load second to make them override.
1481                         $now = wfTimestampNow( );
1482
1483                         while ($row = $dbr->fetchObject( $res ) ) {
1484                                 # Cycle through all the restrictions.
1485
1486                                 // This code should be refactored, now that it's being used more generally,
1487                                 // But I don't really see any harm in leaving it in Block for now -werdna
1488                                 $this->mRestrictionsExpiry = Block::decodeExpiry( $row->pr_expiry );
1489
1490                                 // Only apply the restrictions if they haven't expired!
1491                                 if ( !$this->mRestrictionsExpiry || $this->mRestrictionsExpiry > $now ) {
1492                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1493
1494                                         $this->mCascadeRestriction |= $row->pr_cascade;
1495                                 }
1496                         }
1497                 }
1498
1499                 $this->mRestrictionsLoaded = true;
1500         }
1501
1502         function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1503                 if( !$this->mRestrictionsLoaded ) {
1504                         $dbr =& wfGetDB( DB_SLAVE );
1505
1506                         $res = $dbr->select( 'page_restrictions', '*',
1507                                 array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1508
1509                         $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1510                 }
1511         }
1512
1513         /**
1514          * Purge expired restrictions from the page_restrictions table
1515          */
1516         static function purgeExpiredRestrictions() {
1517                 $dbw = wfGetDB( DB_MASTER );
1518                 $dbw->delete( 'page_restrictions',
1519                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1520                         __METHOD__ );
1521         }
1522
1523         /**
1524          * Accessor/initialisation for mRestrictions
1525          *
1526          * @access public
1527          * @param string $action action that permission needs to be checked for
1528          * @return array the array of groups allowed to edit this article
1529          */
1530         function getRestrictions( $action ) {
1531                 if( $this->exists() ) {
1532                         if( !$this->mRestrictionsLoaded ) {
1533                                 $this->loadRestrictions();
1534                         }
1535                         return isset( $this->mRestrictions[$action] )
1536                                         ? $this->mRestrictions[$action]
1537                                         : array();
1538                 } else {
1539                         return array();
1540                 }
1541         }
1542
1543         /**
1544          * Is there a version of this page in the deletion archive?
1545          * @return int the number of archived revisions
1546          * @access public
1547          */
1548         function isDeleted() {
1549                 $fname = 'Title::isDeleted';
1550                 if ( $this->getNamespace() < 0 ) {
1551                         $n = 0;
1552                 } else {
1553                         $dbr =& wfGetDB( DB_SLAVE );
1554                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1555                                 'ar_title' => $this->getDBkey() ), $fname );
1556                         if( $this->getNamespace() == NS_IMAGE ) {
1557                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1558                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1559                         }
1560                 }
1561                 return (int)$n;
1562         }
1563
1564         /**
1565          * Get the article ID for this Title from the link cache,
1566          * adding it if necessary
1567          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1568          *      for update
1569          * @return int the ID
1570          */
1571         public function getArticleID( $flags = 0 ) {
1572                 $linkCache =& LinkCache::singleton();
1573                 if ( $flags & GAID_FOR_UPDATE ) {
1574                         $oldUpdate = $linkCache->forUpdate( true );
1575                         $this->mArticleID = $linkCache->addLinkObj( $this );
1576                         $linkCache->forUpdate( $oldUpdate );
1577                 } else {
1578                         if ( -1 == $this->mArticleID ) {
1579                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1580                         }
1581                 }
1582                 return $this->mArticleID;
1583         }
1584
1585         function getLatestRevID() {
1586                 if ($this->mLatestID !== false)
1587                         return $this->mLatestID;
1588
1589                 $db =& wfGetDB(DB_SLAVE);
1590                 return $this->mLatestID = $db->selectField( 'revision',
1591                         "max(rev_id)",
1592                         array('rev_page' => $this->getArticleID()),
1593                         'Title::getLatestRevID' );
1594         }
1595
1596         /**
1597          * This clears some fields in this object, and clears any associated
1598          * keys in the "bad links" section of the link cache.
1599          *
1600          * - This is called from Article::insertNewArticle() to allow
1601          * loading of the new page_id. It's also called from
1602          * Article::doDeleteArticle()
1603          *
1604          * @param int $newid the new Article ID
1605          * @access public
1606          */
1607         function resetArticleID( $newid ) {
1608                 $linkCache =& LinkCache::singleton();
1609                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1610
1611                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1612                 else { $this->mArticleID = $newid; }
1613                 $this->mRestrictionsLoaded = false;
1614                 $this->mRestrictions = array();
1615         }
1616
1617         /**
1618          * Updates page_touched for this page; called from LinksUpdate.php
1619          * @return bool true if the update succeded
1620          * @access public
1621          */
1622         function invalidateCache() {
1623                 global $wgUseFileCache;
1624
1625                 if ( wfReadOnly() ) {
1626                         return;
1627                 }
1628
1629                 $dbw =& wfGetDB( DB_MASTER );
1630                 $success = $dbw->update( 'page',
1631                         array( /* SET */
1632                                 'page_touched' => $dbw->timestamp()
1633                         ), array( /* WHERE */
1634                                 'page_namespace' => $this->getNamespace() ,
1635                                 'page_title' => $this->getDBkey()
1636                         ), 'Title::invalidateCache'
1637                 );
1638
1639                 if ($wgUseFileCache) {
1640                         $cache = new HTMLFileCache($this);
1641                         @unlink($cache->fileCacheName());
1642                 }
1643
1644                 return $success;
1645         }
1646
1647         /**
1648          * Prefix some arbitrary text with the namespace or interwiki prefix
1649          * of this object
1650          *
1651          * @param string $name the text
1652          * @return string the prefixed text
1653          * @private
1654          */
1655         /* private */ function prefix( $name ) {
1656                 $p = '';
1657                 if ( '' != $this->mInterwiki ) {
1658                         $p = $this->mInterwiki . ':';
1659                 }
1660                 if ( 0 != $this->mNamespace ) {
1661                         $p .= $this->getNsText() . ':';
1662                 }
1663                 return $p . $name;
1664         }
1665
1666         /**
1667          * Secure and split - main initialisation function for this object
1668          *
1669          * Assumes that mDbkeyform has been set, and is urldecoded
1670          * and uses underscores, but not otherwise munged.  This function
1671          * removes illegal characters, splits off the interwiki and
1672          * namespace prefixes, sets the other forms, and canonicalizes
1673          * everything.
1674          * @return bool true on success
1675          * @private
1676          */
1677         /* private */ function secureAndSplit() {
1678                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1679
1680                 # Initialisation
1681                 static $rxTc = false;
1682                 if( !$rxTc ) {
1683                         # % is needed as well
1684                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1685                 }
1686
1687                 $this->mInterwiki = $this->mFragment = '';
1688                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1689
1690                 $dbkey = $this->mDbkeyform;
1691
1692                 # Strip Unicode bidi override characters.
1693                 # Sometimes they slip into cut-n-pasted page titles, where the
1694                 # override chars get included in list displays.
1695                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1696                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1697
1698                 # Clean up whitespace
1699                 #
1700                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1701                 $dbkey = trim( $dbkey, '_' );
1702
1703                 if ( '' == $dbkey ) {
1704                         return false;
1705                 }
1706
1707                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1708                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1709                         return false;
1710                 }
1711
1712                 $this->mDbkeyform = $dbkey;
1713
1714                 # Initial colon indicates main namespace rather than specified default
1715                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1716                 if ( ':' == $dbkey{0} ) {
1717                         $this->mNamespace = NS_MAIN;
1718                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1719                 }
1720
1721                 # Namespace or interwiki prefix
1722                 $firstPass = true;
1723                 do {
1724                         $m = array();
1725                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1726                                 $p = $m[1];
1727                                 $lowerNs = $wgContLang->lc( $p );
1728                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1729                                         # Canonical namespace
1730                                         $dbkey = $m[2];
1731                                         $this->mNamespace = $ns;
1732                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1733                                         # Ordinary namespace
1734                                         $dbkey = $m[2];
1735                                         $this->mNamespace = $ns;
1736                                 } elseif( $this->getInterwikiLink( $p ) ) {
1737                                         if( !$firstPass ) {
1738                                                 # Can't make a local interwiki link to an interwiki link.
1739                                                 # That's just crazy!
1740                                                 return false;
1741                                         }
1742
1743                                         # Interwiki link
1744                                         $dbkey = $m[2];
1745                                         $this->mInterwiki = $wgContLang->lc( $p );
1746
1747                                         # Redundant interwiki prefix to the local wiki
1748                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1749                                                 if( $dbkey == '' ) {
1750                                                         # Can't have an empty self-link
1751                                                         return false;
1752                                                 }
1753                                                 $this->mInterwiki = '';
1754                                                 $firstPass = false;
1755                                                 # Do another namespace split...
1756                                                 continue;
1757                                         }
1758
1759                                         # If there's an initial colon after the interwiki, that also
1760                                         # resets the default namespace
1761                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1762                                                 $this->mNamespace = NS_MAIN;
1763                                                 $dbkey = substr( $dbkey, 1 );
1764                                         }
1765                                 }
1766                                 # If there's no recognized interwiki or namespace,
1767                                 # then let the colon expression be part of the title.
1768                         }
1769                         break;
1770                 } while( true );
1771
1772                 # We already know that some pages won't be in the database!
1773                 #
1774                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1775                         $this->mArticleID = 0;
1776                 }
1777                 $fragment = strstr( $dbkey, '#' );
1778                 if ( false !== $fragment ) {
1779                         $this->setFragment( $fragment );
1780                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1781                         # remove whitespace again: prevents "Foo_bar_#"
1782                         # becoming "Foo_bar_"
1783                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1784                 }
1785
1786                 # Reject illegal characters.
1787                 #
1788                 if( preg_match( $rxTc, $dbkey ) ) {
1789                         return false;
1790                 }
1791
1792                 /**
1793                  * Pages with "/./" or "/../" appearing in the URLs will
1794                  * often be unreachable due to the way web browsers deal
1795                  * with 'relative' URLs. Forbid them explicitly.
1796                  */
1797                 if ( strpos( $dbkey, '.' ) !== false &&
1798                      ( $dbkey === '.' || $dbkey === '..' ||
1799                        strpos( $dbkey, './' ) === 0  ||
1800                        strpos( $dbkey, '../' ) === 0 ||
1801                        strpos( $dbkey, '/./' ) !== false ||
1802                        strpos( $dbkey, '/../' ) !== false ) )
1803                 {
1804                         return false;
1805                 }
1806
1807                 /**
1808                  * Limit the size of titles to 255 bytes.
1809                  * This is typically the size of the underlying database field.
1810                  * We make an exception for special pages, which don't need to be stored
1811                  * in the database, and may edge over 255 bytes due to subpage syntax
1812                  * for long titles, e.g. [[Special:Block/Long name]]
1813                  */
1814                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1815                   strlen( $dbkey ) > 512 )
1816                 {
1817                         return false;
1818                 }
1819
1820                 /**
1821                  * Normally, all wiki links are forced to have
1822                  * an initial capital letter so [[foo]] and [[Foo]]
1823                  * point to the same place.
1824                  *
1825                  * Don't force it for interwikis, since the other
1826                  * site might be case-sensitive.
1827                  */
1828                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1829                         $dbkey = $wgContLang->ucfirst( $dbkey );
1830                 }
1831
1832                 /**
1833                  * Can't make a link to a namespace alone...
1834                  * "empty" local links can only be self-links
1835                  * with a fragment identifier.
1836                  */
1837                 if( $dbkey == '' &&
1838                         $this->mInterwiki == '' &&
1839                         $this->mNamespace != NS_MAIN ) {
1840                         return false;
1841                 }
1842
1843                 // Any remaining initial :s are illegal.
1844                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1845                         return false;
1846                 }
1847
1848                 # Fill fields
1849                 $this->mDbkeyform = $dbkey;
1850                 $this->mUrlform = wfUrlencode( $dbkey );
1851
1852                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1853
1854                 return true;
1855         }
1856
1857         /**
1858          * Set the fragment for this title
1859          * This is kind of bad, since except for this rarely-used function, Title objects
1860          * are immutable. The reason this is here is because it's better than setting the
1861          * members directly, which is what Linker::formatComment was doing previously.
1862          *
1863          * @param string $fragment text
1864          * @access kind of public
1865          */
1866         function setFragment( $fragment ) {
1867                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1868         }
1869
1870         /**
1871          * Get a Title object associated with the talk page of this article
1872          * @return Title the object for the talk page
1873          * @access public
1874          */
1875         function getTalkPage() {
1876                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1877         }
1878
1879         /**
1880          * Get a title object associated with the subject page of this
1881          * talk page
1882          *
1883          * @return Title the object for the subject page
1884          * @access public
1885          */
1886         function getSubjectPage() {
1887                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1888         }
1889
1890         /**
1891          * Get an array of Title objects linking to this Title
1892          * Also stores the IDs in the link cache.
1893          *
1894          * WARNING: do not use this function on arbitrary user-supplied titles!
1895          * On heavily-used templates it will max out the memory.
1896          *
1897          * @param string $options may be FOR UPDATE
1898          * @return array the Title objects linking here
1899          * @access public
1900          */
1901         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1902                 $linkCache =& LinkCache::singleton();
1903
1904                 if ( $options ) {
1905                         $db =& wfGetDB( DB_MASTER );
1906                 } else {
1907                         $db =& wfGetDB( DB_SLAVE );
1908                 }
1909
1910                 $res = $db->select( array( 'page', $table ),
1911                         array( 'page_namespace', 'page_title', 'page_id' ),
1912                         array(
1913                                 "{$prefix}_from=page_id",
1914                                 "{$prefix}_namespace" => $this->getNamespace(),
1915                                 "{$prefix}_title"     => $this->getDbKey() ),
1916                         'Title::getLinksTo',
1917                         $options );
1918
1919                 $retVal = array();
1920                 if ( $db->numRows( $res ) ) {
1921                         while ( $row = $db->fetchObject( $res ) ) {
1922                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1923                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1924                                         $retVal[] = $titleObj;
1925                                 }
1926                         }
1927                 }
1928                 $db->freeResult( $res );
1929                 return $retVal;
1930         }
1931
1932         /**
1933          * Get an array of Title objects using this Title as a template
1934          * Also stores the IDs in the link cache.
1935          *
1936          * WARNING: do not use this function on arbitrary user-supplied titles!
1937          * On heavily-used templates it will max out the memory.
1938          *
1939          * @param string $options may be FOR UPDATE
1940          * @return array the Title objects linking here
1941          * @access public
1942          */
1943         function getTemplateLinksTo( $options = '' ) {
1944                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1945         }
1946
1947         /**
1948          * Get an array of Title objects referring to non-existent articles linked from this page
1949          *
1950          * @param string $options may be FOR UPDATE
1951          * @return array the Title objects
1952          * @access public
1953          */
1954         function getBrokenLinksFrom( $options = '' ) {
1955                 if ( $options ) {
1956                         $db =& wfGetDB( DB_MASTER );
1957                 } else {
1958                         $db =& wfGetDB( DB_SLAVE );
1959                 }
1960
1961                 $res = $db->safeQuery(
1962                           "SELECT pl_namespace, pl_title
1963                              FROM !
1964                         LEFT JOIN !
1965                                ON pl_namespace=page_namespace
1966                               AND pl_title=page_title
1967                             WHERE pl_from=?
1968                               AND page_namespace IS NULL
1969                                   !",
1970                         $db->tableName( 'pagelinks' ),
1971                         $db->tableName( 'page' ),
1972                         $this->getArticleId(),
1973                         $options );
1974
1975                 $retVal = array();
1976                 if ( $db->numRows( $res ) ) {
1977                         while ( $row = $db->fetchObject( $res ) ) {
1978                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1979                         }
1980                 }
1981                 $db->freeResult( $res );
1982                 return $retVal;
1983         }
1984
1985
1986         /**
1987          * Get a list of URLs to purge from the Squid cache when this
1988          * page changes
1989          *
1990          * @return array the URLs
1991          * @access public
1992          */
1993         function getSquidURLs() {
1994                 global $wgContLang;
1995
1996                 $urls = array(
1997                         $this->getInternalURL(),
1998                         $this->getInternalURL( 'action=history' )
1999                 );
2000
2001                 // purge variant urls as well
2002                 if($wgContLang->hasVariants()){
2003                         $variants = $wgContLang->getVariants();
2004                         foreach($variants as $vCode){
2005                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2006                                 $urls[] = $this->getInternalURL('',$vCode);
2007                         }
2008                 }
2009
2010                 return $urls;
2011         }
2012
2013         function purgeSquid() {
2014                 global $wgUseSquid;
2015                 if ( $wgUseSquid ) {
2016                         $urls = $this->getSquidURLs();
2017                         $u = new SquidUpdate( $urls );
2018                         $u->doUpdate();
2019                 }
2020         }
2021
2022         /**
2023          * Move this page without authentication
2024          * @param Title &$nt the new page Title
2025          * @access public
2026          */
2027         function moveNoAuth( &$nt ) {
2028                 return $this->moveTo( $nt, false );
2029         }
2030
2031         /**
2032          * Check whether a given move operation would be valid.
2033          * Returns true if ok, or a message key string for an error message
2034          * if invalid. (Scarrrrry ugly interface this.)
2035          * @param Title &$nt the new title
2036          * @param bool $auth indicates whether $wgUser's permissions
2037          *      should be checked
2038          * @return mixed true on success, message name on failure
2039          * @access public
2040          */
2041         function isValidMoveOperation( &$nt, $auth = true ) {
2042                 if( !$this or !$nt ) {
2043                         return 'badtitletext';
2044                 }
2045                 if( $this->equals( $nt ) ) {
2046                         return 'selfmove';
2047                 }
2048                 if( !$this->isMovable() || !$nt->isMovable() ) {
2049                         return 'immobile_namespace';
2050                 }
2051
2052                 $oldid = $this->getArticleID();
2053                 $newid = $nt->getArticleID();
2054
2055                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2056                         return 'articleexists';
2057                 }
2058                 if ( ( '' == $this->getDBkey() ) ||
2059                          ( !$oldid ) ||
2060                      ( '' == $nt->getDBkey() ) ) {
2061                         return 'badarticleerror';
2062                 }
2063
2064                 if ( $auth && (
2065                                 !$this->userCan( 'edit' ) || !$nt->userCan( 'edit' ) ||
2066                                 !$this->userCan( 'move' ) || !$nt->userCan( 'move' ) ) ) {
2067                         return 'protectedpage';
2068                 }
2069
2070                 # The move is allowed only if (1) the target doesn't exist, or
2071                 # (2) the target is a redirect to the source, and has no history
2072                 # (so we can undo bad moves right after they're done).
2073
2074                 if ( 0 != $newid ) { # Target exists; check for validity
2075                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2076                                 return 'articleexists';
2077                         }
2078                 }
2079                 return true;
2080         }
2081
2082         /**
2083          * Move a title to a new location
2084          * @param Title &$nt the new title
2085          * @param bool $auth indicates whether $wgUser's permissions
2086          *      should be checked
2087          * @return mixed true on success, message name on failure
2088          * @access public
2089          */
2090         function moveTo( &$nt, $auth = true, $reason = '' ) {
2091                 $err = $this->isValidMoveOperation( $nt, $auth );
2092                 if( is_string( $err ) ) {
2093                         return $err;
2094                 }
2095
2096                 $pageid = $this->getArticleID();
2097                 if( $nt->exists() ) {
2098                         $this->moveOverExistingRedirect( $nt, $reason );
2099                         $pageCountChange = 0;
2100                 } else { # Target didn't exist, do normal move.
2101                         $this->moveToNewTitle( $nt, $reason );
2102                         $pageCountChange = 1;
2103                 }
2104                 $redirid = $this->getArticleID();
2105
2106                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
2107                 $dbw =& wfGetDB( DB_MASTER );
2108                 $categorylinks = $dbw->tableName( 'categorylinks' );
2109                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
2110                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
2111                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
2112                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
2113
2114                 # Update watchlists
2115
2116                 $oldnamespace = $this->getNamespace() & ~1;
2117                 $newnamespace = $nt->getNamespace() & ~1;
2118                 $oldtitle = $this->getDBkey();
2119                 $newtitle = $nt->getDBkey();
2120
2121                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2122                         WatchedItem::duplicateEntries( $this, $nt );
2123                 }
2124
2125                 # Update search engine
2126                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2127                 $u->doUpdate();
2128                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2129                 $u->doUpdate();
2130
2131                 # Update site_stats
2132                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2133                         # No longer a content page
2134                         # Not viewed, edited, removing
2135                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2136                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2137                         # Now a content page
2138                         # Not viewed, edited, adding
2139                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2140                 } elseif( $pageCountChange ) {
2141                         # Redirect added
2142                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2143                 } else {
2144                         # Nothing special
2145                         $u = false;
2146                 }
2147                 if( $u )
2148                         $u->doUpdate();
2149
2150                 global $wgUser;
2151                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2152                 return true;
2153         }
2154
2155         /**
2156          * Move page to a title which is at present a redirect to the
2157          * source page
2158          *
2159          * @param Title &$nt the page to move to, which should currently
2160          *      be a redirect
2161          * @private
2162          */
2163         function moveOverExistingRedirect( &$nt, $reason = '' ) {
2164                 global $wgUseSquid;
2165                 $fname = 'Title::moveOverExistingRedirect';
2166                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2167
2168                 if ( $reason ) {
2169                         $comment .= ": $reason";
2170                 }
2171
2172                 $now = wfTimestampNow();
2173                 $newid = $nt->getArticleID();
2174                 $oldid = $this->getArticleID();
2175                 $dbw =& wfGetDB( DB_MASTER );
2176                 $linkCache =& LinkCache::singleton();
2177
2178                 # Delete the old redirect. We don't save it to history since
2179                 # by definition if we've got here it's rather uninteresting.
2180                 # We have to remove it so that the next step doesn't trigger
2181                 # a conflict on the unique namespace+title index...
2182                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2183
2184                 # Save a null revision in the page's history notifying of the move
2185                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2186                 $nullRevId = $nullRevision->insertOn( $dbw );
2187
2188                 # Change the name of the target page:
2189                 $dbw->update( 'page',
2190                         /* SET */ array(
2191                                 'page_touched'   => $dbw->timestamp($now),
2192                                 'page_namespace' => $nt->getNamespace(),
2193                                 'page_title'     => $nt->getDBkey(),
2194                                 'page_latest'    => $nullRevId,
2195                         ),
2196                         /* WHERE */ array( 'page_id' => $oldid ),
2197                         $fname
2198                 );
2199                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2200
2201                 # Recreate the redirect, this time in the other direction.
2202                 $mwRedir = MagicWord::get( 'redirect' );
2203                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2204                 $redirectArticle = new Article( $this );
2205                 $newid = $redirectArticle->insertOn( $dbw );
2206                 $redirectRevision = new Revision( array(
2207                         'page'    => $newid,
2208                         'comment' => $comment,
2209                         'text'    => $redirectText ) );
2210                 $redirectRevision->insertOn( $dbw );
2211                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2212                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2213
2214                 # Log the move
2215                 $log = new LogPage( 'move' );
2216                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2217
2218                 # Now, we record the link from the redirect to the new title.
2219                 # It should have no other outgoing links...
2220                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2221                 $dbw->insert( 'pagelinks',
2222                         array(
2223                                 'pl_from'      => $newid,
2224                                 'pl_namespace' => $nt->getNamespace(),
2225                                 'pl_title'     => $nt->getDbKey() ),
2226                         $fname );
2227
2228                 # Purge squid
2229                 if ( $wgUseSquid ) {
2230                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2231                         $u = new SquidUpdate( $urls );
2232                         $u->doUpdate();
2233                 }
2234         }
2235
2236         /**
2237          * Move page to non-existing title.
2238          * @param Title &$nt the new Title
2239          * @private
2240          */
2241         function moveToNewTitle( &$nt, $reason = '' ) {
2242                 global $wgUseSquid;
2243                 $fname = 'MovePageForm::moveToNewTitle';
2244                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2245                 if ( $reason ) {
2246                         $comment .= ": $reason";
2247                 }
2248
2249                 $newid = $nt->getArticleID();
2250                 $oldid = $this->getArticleID();
2251                 $dbw =& wfGetDB( DB_MASTER );
2252                 $now = $dbw->timestamp();
2253                 $linkCache =& LinkCache::singleton();
2254
2255                 # Save a null revision in the page's history notifying of the move
2256                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2257                 $nullRevId = $nullRevision->insertOn( $dbw );
2258
2259                 # Rename cur entry
2260                 $dbw->update( 'page',
2261                         /* SET */ array(
2262                                 'page_touched'   => $now,
2263                                 'page_namespace' => $nt->getNamespace(),
2264                                 'page_title'     => $nt->getDBkey(),
2265                                 'page_latest'    => $nullRevId,
2266                         ),
2267                         /* WHERE */ array( 'page_id' => $oldid ),
2268                         $fname
2269                 );
2270
2271                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2272
2273                 # Insert redirect
2274                 $mwRedir = MagicWord::get( 'redirect' );
2275                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2276                 $redirectArticle = new Article( $this );
2277                 $newid = $redirectArticle->insertOn( $dbw );
2278                 $redirectRevision = new Revision( array(
2279                         'page'    => $newid,
2280                         'comment' => $comment,
2281                         'text'    => $redirectText ) );
2282                 $redirectRevision->insertOn( $dbw );
2283                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2284                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2285
2286                 # Log the move
2287                 $log = new LogPage( 'move' );
2288                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2289
2290                 # Purge caches as per article creation
2291                 Article::onArticleCreate( $nt );
2292
2293                 # Record the just-created redirect's linking to the page
2294                 $dbw->insert( 'pagelinks',
2295                         array(
2296                                 'pl_from'      => $newid,
2297                                 'pl_namespace' => $nt->getNamespace(),
2298                                 'pl_title'     => $nt->getDBkey() ),
2299                         $fname );
2300
2301                 # Purge old title from squid
2302                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2303                 $this->purgeSquid();
2304         }
2305
2306         /**
2307          * Checks if $this can be moved to a given Title
2308          * - Selects for update, so don't call it unless you mean business
2309          *
2310          * @param Title &$nt the new title to check
2311          * @access public
2312          */
2313         function isValidMoveTarget( $nt ) {
2314
2315                 $fname = 'Title::isValidMoveTarget';
2316                 $dbw =& wfGetDB( DB_MASTER );
2317
2318                 # Is it a redirect?
2319                 $id  = $nt->getArticleID();
2320                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2321                         array( 'page_is_redirect','old_text','old_flags' ),
2322                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2323                         $fname, 'FOR UPDATE' );
2324
2325                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2326                         # Not a redirect
2327                         wfDebug( __METHOD__ . ": not a redirect\n" );
2328                         return false;
2329                 }
2330                 $text = Revision::getRevisionText( $obj );
2331
2332                 # Does the redirect point to the source?
2333                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2334                 $m = array();
2335                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2336                         $redirTitle = Title::newFromText( $m[1] );
2337                         if( !is_object( $redirTitle ) ||
2338                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2339                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2340                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2341                                 return false;
2342                         }
2343                 } else {
2344                         # Fail safe
2345                         wfDebug( __METHOD__ . ": failsafe\n" );
2346                         return false;
2347                 }
2348
2349                 # Does the article have a history?
2350                 $row = $dbw->selectRow( array( 'page', 'revision'),
2351                         array( 'rev_id' ),
2352                         array( 'page_namespace' => $nt->getNamespace(),
2353                                 'page_title' => $nt->getDBkey(),
2354                                 'page_id=rev_page AND page_latest != rev_id'
2355                         ), $fname, 'FOR UPDATE'
2356                 );
2357
2358                 # Return true if there was no history
2359                 return $row === false;
2360         }
2361
2362         /**
2363          * Get categories to which this Title belongs and return an array of
2364          * categories' names.
2365          *
2366          * @return array an array of parents in the form:
2367          *      $parent => $currentarticle
2368          * @access public
2369          */
2370         function getParentCategories() {
2371                 global $wgContLang;
2372
2373                 $titlekey = $this->getArticleId();
2374                 $dbr =& wfGetDB( DB_SLAVE );
2375                 $categorylinks = $dbr->tableName( 'categorylinks' );
2376
2377                 # NEW SQL
2378                 $sql = "SELECT * FROM $categorylinks"
2379                      ." WHERE cl_from='$titlekey'"
2380                          ." AND cl_from <> '0'"
2381                          ." ORDER BY cl_sortkey";
2382
2383                 $res = $dbr->query ( $sql ) ;
2384
2385                 if($dbr->numRows($res) > 0) {
2386                         while ( $x = $dbr->fetchObject ( $res ) )
2387                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2388                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2389                         $dbr->freeResult ( $res ) ;
2390                 } else {
2391                         $data = '';
2392                 }
2393                 return $data;
2394         }
2395
2396         /**
2397          * Get a tree of parent categories
2398          * @param array $children an array with the children in the keys, to check for circular refs
2399          * @return array
2400          * @access public
2401          */
2402         function getParentCategoryTree( $children = array() ) {
2403                 $parents = $this->getParentCategories();
2404
2405                 if($parents != '') {
2406                         foreach($parents as $parent => $current) {
2407                                 if ( array_key_exists( $parent, $children ) ) {
2408                                         # Circular reference
2409                                         $stack[$parent] = array();
2410                                 } else {
2411                                         $nt = Title::newFromText($parent);
2412                                         if ( $nt ) {
2413                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2414                                         }
2415                                 }
2416                         }
2417                         return $stack;
2418                 } else {
2419                         return array();
2420                 }
2421         }
2422
2423
2424         /**
2425          * Get an associative array for selecting this title from
2426          * the "page" table
2427          *
2428          * @return array
2429          * @access public
2430          */
2431         function pageCond() {
2432                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2433         }
2434
2435         /**
2436          * Get the revision ID of the previous revision
2437          *
2438          * @param integer $revision  Revision ID. Get the revision that was before this one.
2439          * @return integer $oldrevision|false
2440          */
2441         function getPreviousRevisionID( $revision ) {
2442                 $dbr =& wfGetDB( DB_SLAVE );
2443                 return $dbr->selectField( 'revision', 'rev_id',
2444                         'rev_page=' . intval( $this->getArticleId() ) .
2445                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2446         }
2447
2448         /**
2449          * Get the revision ID of the next revision
2450          *
2451          * @param integer $revision  Revision ID. Get the revision that was after this one.
2452          * @return integer $oldrevision|false
2453          */
2454         function getNextRevisionID( $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' );
2459         }
2460
2461         /**
2462          * Get the number of revisions between the given revision IDs.
2463          *
2464          * @param integer $old  Revision ID.
2465          * @param integer $new  Revision ID.
2466          * @return integer  Number of revisions between these IDs.
2467          */
2468         function countRevisionsBetween( $old, $new ) {
2469                 $dbr =& wfGetDB( DB_SLAVE );
2470                 return $dbr->selectField( 'revision', 'count(*)',
2471                         'rev_page = ' . intval( $this->getArticleId() ) .
2472                         ' AND rev_id > ' . intval( $old ) .
2473                         ' AND rev_id < ' . intval( $new ) );
2474         }
2475
2476         /**
2477          * Compare with another title.
2478          *
2479          * @param Title $title
2480          * @return bool
2481          */
2482         function equals( $title ) {
2483                 // Note: === is necessary for proper matching of number-like titles.
2484                 return $this->getInterwiki() === $title->getInterwiki()
2485                         && $this->getNamespace() == $title->getNamespace()
2486                         && $this->getDbkey() === $title->getDbkey();
2487         }
2488
2489         /**
2490          * Check if page exists
2491          * @return bool
2492          */
2493         function exists() {
2494                 return $this->getArticleId() != 0;
2495         }
2496
2497         /**
2498          * Should a link should be displayed as a known link, just based on its title?
2499          *
2500          * Currently, a self-link with a fragment and special pages are in
2501          * this category. Special pages never exist in the database.
2502          */
2503         function isAlwaysKnown() {
2504                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2505                   || NS_SPECIAL == $this->mNamespace;
2506         }
2507
2508         /**
2509          * Update page_touched timestamps and send squid purge messages for
2510          * pages linking to this title. May be sent to the job queue depending
2511          * on the number of links. Typically called on create and delete.
2512          */
2513         function touchLinks() {
2514                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2515                 $u->doUpdate();
2516
2517                 if ( $this->getNamespace() == NS_CATEGORY ) {
2518                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2519                         $u->doUpdate();
2520                 }
2521         }
2522
2523         /**
2524          * Get the last touched timestamp
2525          */
2526         function getTouched() {
2527                 $dbr =& wfGetDB( DB_SLAVE );
2528                 $touched = $dbr->selectField( 'page', 'page_touched',
2529                         array(
2530                                 'page_namespace' => $this->getNamespace(),
2531                                 'page_title' => $this->getDBkey()
2532                         ), __METHOD__
2533                 );
2534                 return $touched;
2535         }
2536
2537         /**
2538          * Get a cached value from a global cache that is invalidated when this page changes
2539          * @param string $key the key
2540          * @param callback $callback A callback function which generates the value on cache miss
2541          *
2542          * @deprecated use DependencyWrapper
2543          */
2544         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2545                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2546                         $params, new TitleDependency( $this ) );
2547         }
2548
2549         function trackbackURL() {
2550                 global $wgTitle, $wgScriptPath, $wgServer;
2551
2552                 return "$wgServer$wgScriptPath/trackback.php?article="
2553                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2554         }
2555
2556         function trackbackRDF() {
2557                 $url = htmlspecialchars($this->getFullURL());
2558                 $title = htmlspecialchars($this->getText());
2559                 $tburl = $this->trackbackURL();
2560
2561                 return "
2562 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2563          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2564          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2565 <rdf:Description
2566    rdf:about=\"$url\"
2567    dc:identifier=\"$url\"
2568    dc:title=\"$title\"
2569    trackback:ping=\"$tburl\" />
2570 </rdf:RDF>";
2571         }
2572
2573         /**
2574          * Generate strings used for xml 'id' names in monobook tabs
2575          * @return string
2576          */
2577         function getNamespaceKey() {
2578                 global $wgContLang;
2579                 switch ($this->getNamespace()) {
2580                         case NS_MAIN:
2581                         case NS_TALK:
2582                                 return 'nstab-main';
2583                         case NS_USER:
2584                         case NS_USER_TALK:
2585                                 return 'nstab-user';
2586                         case NS_MEDIA:
2587                                 return 'nstab-media';
2588                         case NS_SPECIAL:
2589                                 return 'nstab-special';
2590                         case NS_PROJECT:
2591                         case NS_PROJECT_TALK:
2592                                 return 'nstab-project';
2593                         case NS_IMAGE:
2594                         case NS_IMAGE_TALK:
2595                                 return 'nstab-image';
2596                         case NS_MEDIAWIKI:
2597                         case NS_MEDIAWIKI_TALK:
2598                                 return 'nstab-mediawiki';
2599                         case NS_TEMPLATE:
2600                         case NS_TEMPLATE_TALK:
2601                                 return 'nstab-template';
2602                         case NS_HELP:
2603                         case NS_HELP_TALK:
2604                                 return 'nstab-help';
2605                         case NS_CATEGORY:
2606                         case NS_CATEGORY_TALK:
2607                                 return 'nstab-category';
2608                         default:
2609                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2610                 }
2611         }
2612
2613         /**
2614          * Returns true if this title resolves to the named special page
2615          * @param string $name The special page name
2616          * @access public
2617          */
2618         function isSpecial( $name ) {
2619                 if ( $this->getNamespace() == NS_SPECIAL ) {
2620                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2621                         if ( $name == $thisName ) {
2622                                 return true;
2623                         }
2624                 }
2625                 return false;
2626         }
2627
2628         /**
2629          * If the Title refers to a special page alias which is not the local default,
2630          * returns a new Title which points to the local default. Otherwise, returns $this.
2631          */
2632         function fixSpecialName() {
2633                 if ( $this->getNamespace() == NS_SPECIAL ) {
2634                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2635                         if ( $canonicalName ) {
2636                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2637                                 if ( $localName != $this->mDbkeyform ) {
2638                                         return Title::makeTitle( NS_SPECIAL, $localName );
2639                                 }
2640                         }
2641                 }
2642                 return $this;
2643         }
2644
2645         /**
2646          * Is this Title in a namespace which contains content?
2647          * In other words, is this a content page, for the purposes of calculating
2648          * statistics, etc?
2649          *
2650          * @return bool
2651          */
2652         public function isContentPage() {
2653                 return Namespace::isContent( $this->getNamespace() );
2654         }
2655
2656 }
2657
2658 ?>