includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  */
   6
   7 /** */
   8 if ( !class_exists( 'UtfNormal' ) ) {
   9         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
  10 }
  11
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 # Constants for pr_cascade bitfield
  22 define( 'CASCADE', 1 );
  23
  24 /**
  25  * Title class
  26  * - Represents a title, which may contain an interwiki designation or namespace
  27  * - Can fetch various kinds of data from the database, albeit inefficiently.
  28  *
  29  */
  30 class Title {
  31         /**
  32          * Static cache variables
  33          */
  34         static private $titleCache=array();
  35         static private $interwikiCache=array();
  36
  37
  38         /**
  39          * All member variables should be considered private
  40          * Please use the accessor functions
  41          */
  42
  43         /**#@+
  44          * @private
  45          */
  46
  47         var $mTextform;                 # Text form (spaces not underscores) of the main part
  48         var $mUrlform;                  # URL-encoded form of the main part
  49         var $mDbkeyform;                # Main part with underscores
  50         var $mUserCaseDBKey;        # DB key with the initial letter in the case specified by the user
  51         var $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki;                # Interwiki prefix (or null string)
  53         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  54         var $mArticleID;                # Article ID, fetched from the link cache on demand
  55         var $mLatestID;                 # ID of most recent revision
  56         var $mRestrictions;             # Array of groups allowed to edit this article
  57         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  58         var $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  59         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  60         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  61         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  62         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  63         var $mDefaultNamespace;         # Namespace index when there is no namespace
  64                                         # Zero except in {{transclusion}} tags
  65         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  66         var $mLength;              # The page length, 0 for special pages
  67         var $mRedirect;            # Is the article at this title a redirect?
  68         /**#@-*/
  69
  70
  71         /**
  72          * Constructor
  73          * @private
  74          */
  75         /* private */ function __construct() {
  76                 $this->mInterwiki = $this->mUrlform =
  77                 $this->mTextform = $this->mDbkeyform = '';
  78                 $this->mArticleID = -1;
  79                 $this->mNamespace = NS_MAIN;
  80                 $this->mRestrictionsLoaded = false;
  81                 $this->mRestrictions = array();
  82                 # Dont change the following, NS_MAIN is hardcoded in several place
  83                 # See bug #696
  84                 $this->mDefaultNamespace = NS_MAIN;
  85                 $this->mWatched = NULL;
  86                 $this->mLatestID = false;
  87                 $this->mOldRestrictions = false;
  88                 $this->mLength = -1;
  89                 $this->mRedirect = NULL;
  90         }
  91
  92         /**
  93          * Create a new Title from a prefixed DB key
  94          * @param string $key The database key, which has underscores
  95          *      instead of spaces, possibly including namespace and
  96          *      interwiki prefixes
  97          * @return Title the new object, or NULL on an error
  98          */
  99         public static function newFromDBkey( $key ) {
 100                 $t = new Title();
 101                 $t->mDbkeyform = $key;
 102                 if( $t->secureAndSplit() )
 103                         return $t;
 104                 else
 105                         return NULL;
 106         }
 107
 108         /**
 109          * Create a new Title from text, such as what one would
 110          * find in a link. Decodes any HTML entities in the text.
 111          *
 112          * @param string $text the link text; spaces, prefixes,
 113          *      and an initial ':' indicating the main namespace
 114          *      are accepted
 115          * @param int $defaultNamespace the namespace to use if
 116          *      none is specified by a prefix
 117          * @return Title the new object, or NULL on an error
 118          */
 119         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 120                 if( is_object( $text ) ) {
 121                         throw new MWException( 'Title::newFromText given an object' );
 122                 }
 123
 124                 /**
 125                  * Wiki pages often contain multiple links to the same page.
 126                  * Title normalization and parsing can become expensive on
 127                  * pages with many links, so we can save a little time by
 128                  * caching them.
 129                  *
 130                  * In theory these are value objects and won't get changed...
 131                  */
 132                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 133                         return Title::$titleCache[$text];
 134                 }
 135
 136                 /**
 137                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 138                  */
 139                 $filteredText = Sanitizer::decodeCharReferences( $text );
 140
 141                 $t = new Title();
 142                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 143                 $t->mDefaultNamespace = $defaultNamespace;
 144
 145                 static $cachedcount = 0 ;
 146                 if( $t->secureAndSplit() ) {
 147                         if( $defaultNamespace == NS_MAIN ) {
 148                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 149                                         # Avoid memory leaks on mass operations...
 150                                         Title::$titleCache = array();
 151                                         $cachedcount=0;
 152                                 }
 153                                 $cachedcount++;
 154                                 Title::$titleCache[$text] =& $t;
 155                         }
 156                         return $t;
 157                 } else {
 158                         $ret = NULL;
 159                         return $ret;
 160                 }
 161         }
 162
 163         /**
 164          * Create a new Title from URL-encoded text. Ensures that
 165          * the given title's length does not exceed the maximum.
 166          * @param string $url the title, as might be taken from a URL
 167          * @return Title the new object, or NULL on an error
 168          */
 169         public static function newFromURL( $url ) {
 170                 global $wgLegalTitleChars;
 171                 $t = new Title();
 172
 173                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 174                 # but some URLs used it as a space replacement and they still come
 175                 # from some external search tools.
 176                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 177                         $url = str_replace( '+', ' ', $url );
 178                 }
 179
 180                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 181                 if( $t->secureAndSplit() ) {
 182                         return $t;
 183                 } else {
 184                         return NULL;
 185                 }
 186         }
 187
 188         /**
 189          * Create a new Title from an article ID
 190          *
 191          * @todo This is inefficiently implemented, the page row is requested
 192          *       but not used for anything else
 193          *
 194          * @param int $id the page_id corresponding to the Title to create
 195          * @return Title the new object, or NULL on an error
 196          */
 197         public static function newFromID( $id ) {
 198                 $fname = 'Title::newFromID';
 199                 $dbr = wfGetDB( DB_SLAVE );
 200                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 201                         array( 'page_id' => $id ), $fname );
 202                 if ( $row !== false ) {
 203                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 204                 } else {
 205                         $title = NULL;
 206                 }
 207                 return $title;
 208         }
 209
 210         /**
 211          * Make an array of titles from an array of IDs
 212          */
 213         public static function newFromIDs( $ids ) {
 214                 if ( !count( $ids ) ) {
 215                         return array();
 216                 }
 217                 $dbr = wfGetDB( DB_SLAVE );
 218                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 219                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 220
 221                 $titles = array();
 222                 while ( $row = $dbr->fetchObject( $res ) ) {
 223                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 224                 }
 225                 return $titles;
 226         }
 227
 228         /**
 229          * Make a Title object from a DB row
 230          * @param Row $row (needs at least page_title,page_namespace)
 231          */
 232         public static function newFromRow( $row ) {
 233                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 234
 235                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 236                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 237                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 238                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 239
 240                 return $t;
 241         }
 242
 243         /**
 244          * Create a new Title from a namespace index and a DB key.
 245          * It's assumed that $ns and $title are *valid*, for instance when
 246          * they came directly from the database or a special page name.
 247          * For convenience, spaces are converted to underscores so that
 248          * eg user_text fields can be used directly.
 249          *
 250          * @param int $ns the namespace of the article
 251          * @param string $title the unprefixed database key form
 252          * @return Title the new object
 253          */
 254         public static function &makeTitle( $ns, $title ) {
 255                 $t = new Title();
 256                 $t->mInterwiki = '';
 257                 $t->mFragment = '';
 258                 $t->mNamespace = $ns = intval( $ns );
 259                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 260                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 261                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 262                 $t->mTextform = str_replace( '_', ' ', $title );
 263                 return $t;
 264         }
 265
 266         /**
 267          * Create a new Title from a namespace index and a DB key.
 268          * The parameters will be checked for validity, which is a bit slower
 269          * than makeTitle() but safer for user-provided data.
 270          *
 271          * @param int $ns the namespace of the article
 272          * @param string $title the database key form
 273          * @return Title the new object, or NULL on an error
 274          */
 275         public static function makeTitleSafe( $ns, $title ) {
 276                 $t = new Title();
 277                 $t->mDbkeyform = Title::makeName( $ns, $title );
 278                 if( $t->secureAndSplit() ) {
 279                         return $t;
 280                 } else {
 281                         return NULL;
 282                 }
 283         }
 284
 285         /**
 286          * Create a new Title for the Main Page
 287          * @return Title the new object
 288          */
 289         public static function newMainPage() {
 290                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 291                 // Don't give fatal errors if the message is broken
 292                 if ( !$title ) {
 293                         $title = Title::newFromText( 'Main Page' );
 294                 }
 295                 return $title;
 296         }
 297
 298         /**
 299          * Extract a redirect destination from a string and return the
 300          * Title, or null if the text doesn't contain a valid redirect
 301          *
 302          * @param string $text Text with possible redirect
 303          * @return Title
 304          */
 305         public static function newFromRedirect( $text ) {
 306                 $redir = MagicWord::get( 'redirect' );
 307                 if( $redir->matchStart( trim($text) ) ) {
 308                         // Extract the first link and see if it's usable
 309                         $m = array();
 310                         if( preg_match( '!\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 311                                 // Strip preceding colon used to "escape" categories, etc.
 312                                 // and URL-decode links
 313                                 if( strpos( $m[1], '%' ) !== false ) {
 314                                         // Match behavior of inline link parsing here;
 315                                         // don't interpret + as " " most of the time!
 316                                         // It might be safe to just use rawurldecode instead, though.
 317                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 318                                 }
 319                                 $title = Title::newFromText( $m[1] );
 320                                 // Redirects to Special:Userlogout are not permitted
 321                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 322                                         return $title;
 323                         }
 324                 }
 325                 return null;
 326         }
 327
 328 #----------------------------------------------------------------------------
 329 #       Static functions
 330 #----------------------------------------------------------------------------
 331
 332         /**
 333          * Get the prefixed DB key associated with an ID
 334          * @param int $id the page_id of the article
 335          * @return Title an object representing the article, or NULL
 336          *      if no such article was found
 337          * @static
 338          * @access public
 339          */
 340         function nameOf( $id ) {
 341                 $fname = 'Title::nameOf';
 342                 $dbr = wfGetDB( DB_SLAVE );
 343
 344                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 345                 if ( $s === false ) { return NULL; }
 346
 347                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 348                 return $n;
 349         }
 350
 351         /**
 352          * Get a regex character class describing the legal characters in a link
 353          * @return string the list of characters, not delimited
 354          */
 355         public static function legalChars() {
 356                 global $wgLegalTitleChars;
 357                 return $wgLegalTitleChars;
 358         }
 359
 360         /**
 361          * Get a string representation of a title suitable for
 362          * including in a search index
 363          *
 364          * @param int $ns a namespace index
 365          * @param string $title text-form main part
 366          * @return string a stripped-down title string ready for the
 367          *      search index
 368          */
 369         public static function indexTitle( $ns, $title ) {
 370                 global $wgContLang;
 371
 372                 $lc = SearchEngine::legalSearchChars() . '&#;';
 373                 $t = $wgContLang->stripForSearch( $title );
 374                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 375                 $t = $wgContLang->lc( $t );
 376
 377                 # Handle 's, s'
 378                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 379                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 380
 381                 $t = preg_replace( "/\\s+/", ' ', $t );
 382
 383                 if ( $ns == NS_IMAGE ) {
 384                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 385                 }
 386                 return trim( $t );
 387         }
 388
 389         /*
 390          * Make a prefixed DB key from a DB key and a namespace index
 391          * @param int $ns numerical representation of the namespace
 392          * @param string $title the DB key form the title
 393          * @return string the prefixed form of the title
 394          */
 395         public static function makeName( $ns, $title ) {
 396                 global $wgContLang;
 397
 398                 $n = $wgContLang->getNsText( $ns );
 399                 return $n == '' ? $title : "$n:$title";
 400         }
 401
 402         /**
 403          * Returns the URL associated with an interwiki prefix
 404          * @param string $key the interwiki prefix (e.g. "MeatBall")
 405          * @return the associated URL, containing "$1", which should be
 406          *      replaced by an article title
 407          * @static (arguably)
 408          */
 409         public function getInterwikiLink( $key )  {
 410                 global $wgMemc, $wgInterwikiExpiry;
 411                 global $wgInterwikiCache, $wgContLang;
 412                 $fname = 'Title::getInterwikiLink';
 413
 414                 $key = $wgContLang->lc( $key );
 415
 416                 $k = wfMemcKey( 'interwiki', $key );
 417                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 418                         return Title::$interwikiCache[$k]->iw_url;
 419                 }
 420
 421                 if ($wgInterwikiCache) {
 422                         return Title::getInterwikiCached( $key );
 423                 }
 424
 425                 $s = $wgMemc->get( $k );
 426                 # Ignore old keys with no iw_local
 427                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 428                         Title::$interwikiCache[$k] = $s;
 429                         return $s->iw_url;
 430                 }
 431
 432                 $dbr = wfGetDB( DB_SLAVE );
 433                 $res = $dbr->select( 'interwiki',
 434                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 435                         array( 'iw_prefix' => $key ), $fname );
 436                 if( !$res ) {
 437                         return '';
 438                 }
 439
 440                 $s = $dbr->fetchObject( $res );
 441                 if( !$s ) {
 442                         # Cache non-existence: create a blank object and save it to memcached
 443                         $s = (object)false;
 444                         $s->iw_url = '';
 445                         $s->iw_local = 0;
 446                         $s->iw_trans = 0;
 447                 }
 448                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 449                 Title::$interwikiCache[$k] = $s;
 450
 451                 return $s->iw_url;
 452         }
 453
 454         /**
 455          * Fetch interwiki prefix data from local cache in constant database
 456          *
 457          * More logic is explained in DefaultSettings
 458          *
 459          * @return string URL of interwiki site
 460          */
 461         public static function getInterwikiCached( $key ) {
 462                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 463                 static $db, $site;
 464
 465                 if (!$db)
 466                         $db=dba_open($wgInterwikiCache,'r','cdb');
 467                 /* Resolve site name */
 468                 if ($wgInterwikiScopes>=3 and !$site) {
 469                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 470                         if ($site=="")
 471                                 $site = $wgInterwikiFallbackSite;
 472                 }
 473                 $value = dba_fetch( wfMemcKey( $key ), $db);
 474                 if ($value=='' and $wgInterwikiScopes>=3) {
 475                         /* try site-level */
 476                         $value = dba_fetch("_{$site}:{$key}", $db);
 477                 }
 478                 if ($value=='' and $wgInterwikiScopes>=2) {
 479                         /* try globals */
 480                         $value = dba_fetch("__global:{$key}", $db);
 481                 }
 482                 if ($value=='undef')
 483                         $value='';
 484                 $s = (object)false;
 485                 $s->iw_url = '';
 486                 $s->iw_local = 0;
 487                 $s->iw_trans = 0;
 488                 if ($value!='') {
 489                         list($local,$url)=explode(' ',$value,2);
 490                         $s->iw_url=$url;
 491                         $s->iw_local=(int)$local;
 492                 }
 493                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 494                 return $s->iw_url;
 495         }
 496         /**
 497          * Determine whether the object refers to a page within
 498          * this project.
 499          *
 500          * @return bool TRUE if this is an in-project interwiki link
 501          *      or a wikilink, FALSE otherwise
 502          */
 503         public function isLocal() {
 504                 if ( $this->mInterwiki != '' ) {
 505                         # Make sure key is loaded into cache
 506                         $this->getInterwikiLink( $this->mInterwiki );
 507                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 508                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 509                 } else {
 510                         return true;
 511                 }
 512         }
 513
 514         /**
 515          * Determine whether the object refers to a page within
 516          * this project and is transcludable.
 517          *
 518          * @return bool TRUE if this is transcludable
 519          */
 520         public function isTrans() {
 521                 if ($this->mInterwiki == '')
 522                         return false;
 523                 # Make sure key is loaded into cache
 524                 $this->getInterwikiLink( $this->mInterwiki );
 525                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 526                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 527         }
 528
 529         /**
 530          * Escape a text fragment, say from a link, for a URL
 531          */
 532         static function escapeFragmentForURL( $fragment ) {
 533                 $fragment = str_replace( ' ', '_', $fragment );
 534                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 535                 $replaceArray = array(
 536                         '%3A' => ':',
 537                         '%' => '.'
 538                 );
 539                 return strtr( $fragment, $replaceArray );
 540         }
 541
 542 #----------------------------------------------------------------------------
 543 #       Other stuff
 544 #----------------------------------------------------------------------------
 545
 546         /** Simple accessors */
 547         /**
 548          * Get the text form (spaces not underscores) of the main part
 549          * @return string
 550          */
 551         public function getText() { return $this->mTextform; }
 552         /**
 553          * Get the URL-encoded form of the main part
 554          * @return string
 555          */
 556         public function getPartialURL() { return $this->mUrlform; }
 557         /**
 558          * Get the main part with underscores
 559          * @return string
 560          */
 561         public function getDBkey() { return $this->mDbkeyform; }
 562         /**
 563          * Get the namespace index, i.e. one of the NS_xxxx constants
 564          * @return int
 565          */
 566         public function getNamespace() { return $this->mNamespace; }
 567         /**
 568          * Get the namespace text
 569          * @return string
 570          */
 571         public function getNsText() {
 572                 global $wgContLang, $wgCanonicalNamespaceNames;
 573
 574                 if ( '' != $this->mInterwiki ) {
 575                         // This probably shouldn't even happen. ohh man, oh yuck.
 576                         // But for interwiki transclusion it sometimes does.
 577                         // Shit. Shit shit shit.
 578                         //
 579                         // Use the canonical namespaces if possible to try to
 580                         // resolve a foreign namespace.
 581                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 582                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 583                         }
 584                 }
 585                 return $wgContLang->getNsText( $this->mNamespace );
 586         }
 587         /**
 588          * Get the DB key with the initial letter case as specified by the user
 589          */
 590         function getUserCaseDBKey() {
 591                 return $this->mUserCaseDBKey;
 592         }
 593         /**
 594          * Get the namespace text of the subject (rather than talk) page
 595          * @return string
 596          */
 597         public function getSubjectNsText() {
 598                 global $wgContLang;
 599                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 600         }
 601
 602         /**
 603          * Get the namespace text of the talk page
 604          * @return string
 605          */
 606         public function getTalkNsText() {
 607                 global $wgContLang;
 608                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 609         }
 610
 611         /**
 612          * Could this title have a corresponding talk page?
 613          * @return bool
 614          */
 615         public function canTalk() {
 616                 return( MWNamespace::canTalk( $this->mNamespace ) );
 617         }
 618
 619         /**
 620          * Get the interwiki prefix (or null string)
 621          * @return string
 622          */
 623         public function getInterwiki() { return $this->mInterwiki; }
 624         /**
 625          * Get the Title fragment (i.e. the bit after the #) in text form
 626          * @return string
 627          */
 628         public function getFragment() { return $this->mFragment; }
 629         /**
 630          * Get the fragment in URL form, including the "#" character if there is one
 631          * @return string
 632          */
 633         public function getFragmentForURL() {
 634                 if ( $this->mFragment == '' ) {
 635                         return '';
 636                 } else {
 637                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 638                 }
 639         }
 640         /**
 641          * Get the default namespace index, for when there is no namespace
 642          * @return int
 643          */
 644         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 645
 646         /**
 647          * Get title for search index
 648          * @return string a stripped-down title string ready for the
 649          *      search index
 650          */
 651         public function getIndexTitle() {
 652                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 653         }
 654
 655         /**
 656          * Get the prefixed database key form
 657          * @return string the prefixed title, with underscores and
 658          *      any interwiki and namespace prefixes
 659          */
 660         public function getPrefixedDBkey() {
 661                 $s = $this->prefix( $this->mDbkeyform );
 662                 $s = str_replace( ' ', '_', $s );
 663                 return $s;
 664         }
 665
 666         /**
 667          * Get the prefixed title with spaces.
 668          * This is the form usually used for display
 669          * @return string the prefixed title, with spaces
 670          */
 671         public function getPrefixedText() {
 672                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 673                         $s = $this->prefix( $this->mTextform );
 674                         $s = str_replace( '_', ' ', $s );
 675                         $this->mPrefixedText = $s;
 676                 }
 677                 return $this->mPrefixedText;
 678         }
 679
 680         /**
 681          * Get the prefixed title with spaces, plus any fragment
 682          * (part beginning with '#')
 683          * @return string the prefixed title, with spaces and
 684          *      the fragment, including '#'
 685          */
 686         public function getFullText() {
 687                 $text = $this->getPrefixedText();
 688                 if( '' != $this->mFragment ) {
 689                         $text .= '#' . $this->mFragment;
 690                 }
 691                 return $text;
 692         }
 693
 694         /**
 695          * Get the base name, i.e. the leftmost parts before the /
 696          * @return string Base name
 697          */
 698         public function getBaseText() {
 699                 global $wgNamespacesWithSubpages;
 700                 if( !empty( $wgNamespacesWithSubpages[$this->mNamespace] ) ) {
 701                         $parts = explode( '/', $this->getText() );
 702                         # Don't discard the real title if there's no subpage involved
 703                         if( count( $parts ) > 1 )
 704                                 unset( $parts[ count( $parts ) - 1 ] );
 705                         return implode( '/', $parts );
 706                 } else {
 707                         return $this->getText();
 708                 }
 709         }
 710
 711         /**
 712          * Get the lowest-level subpage name, i.e. the rightmost part after /
 713          * @return string Subpage name
 714          */
 715         public function getSubpageText() {
 716                 global $wgNamespacesWithSubpages;
 717                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 718                         $parts = explode( '/', $this->mTextform );
 719                         return( $parts[ count( $parts ) - 1 ] );
 720                 } else {
 721                         return( $this->mTextform );
 722                 }
 723         }
 724
 725         /**
 726          * Get a URL-encoded form of the subpage text
 727          * @return string URL-encoded subpage name
 728          */
 729         public function getSubpageUrlForm() {
 730                 $text = $this->getSubpageText();
 731                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 732                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 733                 return( $text );
 734         }
 735
 736         /**
 737          * Get a URL-encoded title (not an actual URL) including interwiki
 738          * @return string the URL-encoded form
 739          */
 740         public function getPrefixedURL() {
 741                 $s = $this->prefix( $this->mDbkeyform );
 742                 $s = str_replace( ' ', '_', $s );
 743
 744                 $s = wfUrlencode ( $s ) ;
 745
 746                 # Cleaning up URL to make it look nice -- is this safe?
 747                 $s = str_replace( '%28', '(', $s );
 748                 $s = str_replace( '%29', ')', $s );
 749
 750                 return $s;
 751         }
 752
 753         /**
 754          * Get a real URL referring to this title, with interwiki link and
 755          * fragment
 756          *
 757          * @param string $query an optional query string, not used
 758          *      for interwiki links
 759          * @param string $variant language variant of url (for sr, zh..)
 760          * @return string the URL
 761          */
 762         public function getFullURL( $query = '', $variant = false ) {
 763                 global $wgContLang, $wgServer, $wgRequest;
 764
 765                 $query = wfBuildQuery( $query ); # Support query input other than strings.
 766
 767                 if ( '' == $this->mInterwiki ) {
 768                         $url = $this->getLocalUrl( $query, $variant );
 769
 770                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 771                         // Correct fix would be to move the prepending elsewhere.
 772                         if ($wgRequest->getVal('action') != 'render') {
 773                                 $url = $wgServer . $url;
 774                         }
 775                 } else {
 776                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 777
 778                         $namespace = wfUrlencode( $this->getNsText() );
 779                         if ( '' != $namespace ) {
 780                                 # Can this actually happen? Interwikis shouldn't be parsed.
 781                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 782                                 $namespace .= ':';
 783                         }
 784                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 785                         $url = wfAppendQuery( $url, $query );
 786                 }
 787
 788                 # Finally, add the fragment.
 789                 $url .= $this->getFragmentForURL();
 790
 791                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 792                 return $url;
 793         }
 794
 795         /**
 796          * Get a URL with no fragment or server name.  If this page is generated
 797          * with action=render, $wgServer is prepended.
 798          * @param string $query an optional query string; if not specified,
 799          *      $wgArticlePath will be used.
 800          * @param string $variant language variant of url (for sr, zh..)
 801          * @return string the URL
 802          */
 803         public function getLocalURL( $query = '', $variant = false ) {
 804                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 805                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 806
 807                 $query = wfBuildQuery( $query ); # Support query input other than strings.
 808
 809                 // internal links should point to same variant as current page (only anonymous users)
 810                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 811                         $pref = $wgContLang->getPreferredVariant(false);
 812                         if($pref != $wgContLang->getCode())
 813                                 $variant = $pref;
 814                 }
 815
 816                 if ( $this->isExternal() ) {
 817                         $url = $this->getFullURL();
 818                         if ( $query ) {
 819                                 // This is currently only used for edit section links in the
 820                                 // context of interwiki transclusion. In theory we should
 821                                 // append the query to the end of any existing query string,
 822                                 // but interwiki transclusion is already broken in that case.
 823                                 $url .= "?$query";
 824                         }
 825                 } else {
 826                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 827                         if ( $query == '' ) {
 828                                 if( $variant != false && $wgContLang->hasVariants() ) {
 829                                         if( $wgVariantArticlePath == false ) {
 830                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 831                                         } else {
 832                                                 $variantArticlePath = $wgVariantArticlePath;
 833                                         }
 834                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 835                                         $url = str_replace( '$1', $dbkey, $url  );
 836                                 } else {
 837                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 838                                 }
 839                         } else {
 840                                 global $wgActionPaths;
 841                                 $url = false;
 842                                 $matches = array();
 843                                 if( !empty( $wgActionPaths ) &&
 844                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 845                                 {
 846                                         $action = urldecode( $matches[2] );
 847                                         if( isset( $wgActionPaths[$action] ) ) {
 848                                                 $query = $matches[1];
 849                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 850                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 851                                                 $url = wfAppendQuery( $url, $query );
 852                                         }
 853                                 }
 854                                 if ( $url === false ) {
 855                                         if ( $query == '-' ) {
 856                                                 $query = '';
 857                                         }
 858                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 859                                 }
 860                         }
 861
 862                         // FIXME: this causes breakage in various places when we
 863                         // actually expected a local URL and end up with dupe prefixes.
 864                         if ($wgRequest->getVal('action') == 'render') {
 865                                 $url = $wgServer . $url;
 866                         }
 867                 }
 868                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 869                 return $url;
 870         }
 871
 872         /**
 873          * Get an HTML-escaped version of the URL form, suitable for
 874          * using in a link, without a server name or fragment
 875          * @param string $query an optional query string
 876          * @return string the URL
 877          */
 878         public function escapeLocalURL( $query = '' ) {
 879                 return htmlspecialchars( $this->getLocalURL( $query ) );
 880         }
 881
 882         /**
 883          * Get an HTML-escaped version of the URL form, suitable for
 884          * using in a link, including the server name and fragment
 885          *
 886          * @return string the URL
 887          * @param string $query an optional query string
 888          */
 889         public function escapeFullURL( $query = '' ) {
 890                 return htmlspecialchars( $this->getFullURL( $query ) );
 891         }
 892
 893         /**
 894          * Get the URL form for an internal link.
 895          * - Used in various Squid-related code, in case we have a different
 896          * internal hostname for the server from the exposed one.
 897          *
 898          * @param string $query an optional query string
 899          * @param string $variant language variant of url (for sr, zh..)
 900          * @return string the URL
 901          */
 902         public function getInternalURL( $query = '', $variant = false ) {
 903                 global $wgInternalServer;
 904                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 905                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 906                 return $url;
 907         }
 908
 909         /**
 910          * Get the edit URL for this Title
 911          * @return string the URL, or a null string if this is an
 912          *      interwiki link
 913          */
 914         public function getEditURL() {
 915                 if ( '' != $this->mInterwiki ) { return ''; }
 916                 $s = $this->getLocalURL( 'action=edit' );
 917
 918                 return $s;
 919         }
 920
 921         /**
 922          * Get the HTML-escaped displayable text form.
 923          * Used for the title field in <a> tags.
 924          * @return string the text, including any prefixes
 925          */
 926         public function getEscapedText() {
 927                 return htmlspecialchars( $this->getPrefixedText() );
 928         }
 929
 930         /**
 931          * Is this Title interwiki?
 932          * @return boolean
 933          */
 934         public function isExternal() { return ( '' != $this->mInterwiki ); }
 935
 936         /**
 937          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 938          *
 939          * @param string Action to check (default: edit)
 940          * @return bool
 941          */
 942         public function isSemiProtected( $action = 'edit' ) {
 943                 if( $this->exists() ) {
 944                         $restrictions = $this->getRestrictions( $action );
 945                         if( count( $restrictions ) > 0 ) {
 946                                 foreach( $restrictions as $restriction ) {
 947                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 948                                                 return false;
 949                                 }
 950                         } else {
 951                                 # Not protected
 952                                 return false;
 953                         }
 954                         return true;
 955                 } else {
 956                         # If it doesn't exist, it can't be protected
 957                         return false;
 958                 }
 959         }
 960
 961         /**
 962          * Does the title correspond to a protected article?
 963          * @param string $what the action the page is protected from,
 964          * by default checks move and edit
 965          * @return boolean
 966          */
 967         public function isProtected( $action = '' ) {
 968                 global $wgRestrictionLevels, $wgRestrictionTypes;
 969
 970                 # Special pages have inherent protection
 971                 if( $this->getNamespace() == NS_SPECIAL )
 972                         return true;
 973
 974                 # Check regular protection levels
 975                 foreach( $wgRestrictionTypes as $type ){
 976                         if( $action == $type || $action == '' ) {
 977                                 $r = $this->getRestrictions( $type );
 978                                 foreach( $wgRestrictionLevels as $level ) {
 979                                         if( in_array( $level, $r ) && $level != '' ) {
 980                                                 return true;
 981                                         }
 982                                 }
 983                         }
 984                 }
 985
 986                 return false;
 987         }
 988
 989         /**
 990          * Is $wgUser watching this page?
 991          * @return boolean
 992          */
 993         public function userIsWatching() {
 994                 global $wgUser;
 995
 996                 if ( is_null( $this->mWatched ) ) {
 997                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 998                                 $this->mWatched = false;
 999                         } else {
1000                                 $this->mWatched = $wgUser->isWatched( $this );
1001                         }
1002                 }
1003                 return $this->mWatched;
1004         }
1005
1006         /**
1007          * Can $wgUser perform $action on this page?
1008          * This skips potentially expensive cascading permission checks.
1009          *
1010          * Suitable for use for nonessential UI controls in common cases, but
1011          * _not_ for functional access control.
1012          *
1013          * May provide false positives, but should never provide a false negative.
1014          *
1015          * @param string $action action that permission needs to be checked for
1016          * @return boolean
1017          */
1018         public function quickUserCan( $action ) {
1019                 return $this->userCan( $action, false );
1020         }
1021
1022         /**
1023          * Determines if $wgUser is unable to edit this page because it has been protected
1024          * by $wgNamespaceProtection.
1025          *
1026          * @return boolean
1027          */
1028         public function isNamespaceProtected() {
1029                 global $wgNamespaceProtection, $wgUser;
1030                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1031                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1032                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1033                                         return true;
1034                         }
1035                 }
1036                 return false;
1037         }
1038
1039         /**
1040          * Can $wgUser perform $action on this page?
1041          * @param string $action action that permission needs to be checked for
1042          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1043          * @return boolean
1044          */
1045         public function userCan( $action, $doExpensiveQueries = true ) {
1046                 global $wgUser;
1047                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1048         }
1049
1050         /**
1051          * Can $user perform $action on this page?
1052          *
1053          * FIXME: This *does not* check throttles (User::pingLimiter()).
1054          *
1055          * @param string $action action that permission needs to be checked for
1056          * @param User $user user to check
1057          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1058          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1059          */
1060         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true ) {
1061                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1062
1063                 global $wgContLang;
1064                 global $wgLang;
1065                 global $wgEmailConfirmToEdit;
1066
1067                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1068                         $errors[] = array( 'confirmedittext' );
1069                 }
1070
1071                 if ( $user->isBlockedFrom( $this ) ) {
1072                         $block = $user->mBlock;
1073
1074                         // This is from OutputPage::blockedPage
1075                         // Copied at r23888 by werdna
1076
1077                         $id = $user->blockedBy();
1078                         $reason = $user->blockedFor();
1079                         if( $reason == '' ) {
1080                                 $reason = wfMsg( 'blockednoreason' );
1081                         }
1082                         $ip = wfGetIP();
1083
1084                         if ( is_numeric( $id ) ) {
1085                                 $name = User::whoIs( $id );
1086                         } else {
1087                                 $name = $id;
1088                         }
1089
1090                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1091                         $blockid = $block->mId;
1092                         $blockExpiry = $user->mBlock->mExpiry;
1093                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1094
1095                         if ( $blockExpiry == 'infinity' ) {
1096                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1097                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1098
1099                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1100                                         if ( strpos( $option, ':' ) == false )
1101                                                 continue;
1102
1103                                         list ($show, $value) = explode( ":", $option );
1104
1105                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1106                                                 $blockExpiry = $show;
1107                                                 break;
1108                                         }
1109                                 }
1110                         } else {
1111                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1112                         }
1113
1114                         $intended = $user->mBlock->mAddress;
1115
1116                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1117                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1118                 }
1119
1120                 return $errors;
1121         }
1122
1123         /**
1124          * Can $user perform $action on this page? This is an internal function,
1125          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1126          * checks on wfReadOnly() and blocks)
1127          *
1128          * @param string $action action that permission needs to be checked for
1129          * @param User $user user to check
1130          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1131          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1132          */
1133         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1134                 wfProfileIn( __METHOD__ );
1135
1136                 $errors = array();
1137
1138                 // Use getUserPermissionsErrors instead
1139                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1140                         wfProfileOut( __METHOD__ );
1141                         return $result ? array() : array( array( 'badaccess-group0' ) );
1142                 }
1143
1144                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1145                         if ($result != array() && is_array($result) && !is_array($result[0]))
1146                                 $errors[] = $result; # A single array representing an error
1147                         else if (is_array($result) && is_array($result[0]))
1148                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1149                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1150                                 $errors[] = array($result); # A string representing a message-id
1151                         else if ($result === false )
1152                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1153                 }
1154                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1155                         if ($result != array() && is_array($result) && !is_array($result[0]))
1156                                 $errors[] = $result; # A single array representing an error
1157                         else if (is_array($result) && is_array($result[0]))
1158                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1159                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1160                                 $errors[] = array($result); # A string representing a message-id
1161                         else if ($result === false )
1162                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1163                 }
1164
1165                 if( NS_SPECIAL == $this->mNamespace ) {
1166                         $errors[] = array('ns-specialprotected');
1167                 }
1168
1169                 if ( $this->isNamespaceProtected() ) {
1170                         $ns = $this->getNamespace() == NS_MAIN
1171                                 ? wfMsg( 'nstab-main' )
1172                                 : $this->getNsText();
1173                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1174                                 ? array('protectedinterface')
1175                                 : array( 'namespaceprotected',  $ns ) );
1176                 }
1177
1178                 if( $this->mDbkeyform == '_' ) {
1179                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1180                         $errors[] = array('badaccess-group0');
1181                 }
1182
1183                 # protect css/js subpages of user pages
1184                 # XXX: this might be better using restrictions
1185                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1186                 if( $this->isCssJsSubpage()
1187                         && !$user->isAllowed('editusercssjs')
1188                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1189                         $errors[] = array('customcssjsprotected');
1190                 }
1191
1192                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1193                         # We /could/ use the protection level on the source page, but it's fairly ugly
1194                         #  as we have to establish a precedence hierarchy for pages included by multiple
1195                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1196                         #  as they could remove the protection anyway.
1197                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1198                         # Cascading protection depends on more than this page...
1199                         # Several cascading protected pages may include this page...
1200                         # Check each cascading level
1201                         # This is only for protection restrictions, not for all actions
1202                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1203                                 foreach( $restrictions[$action] as $right ) {
1204                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1205                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1206                                                 $pages = '';
1207                                                 foreach( $cascadingSources as $page )
1208                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1209                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1210                                         }
1211                                 }
1212                         }
1213                 }
1214
1215                 foreach( $this->getRestrictions($action) as $right ) {
1216                         // Backwards compatibility, rewrite sysop -> protect
1217                         if ( $right == 'sysop' ) {
1218                                 $right = 'protect';
1219                         }
1220                         if( '' != $right && !$user->isAllowed( $right ) ) {
1221                                 //Users with 'editprotected' permission can edit protected pages
1222                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1223                                         //Users with 'editprotected' permission cannot edit protected pages
1224                                         //with cascading option turned on.
1225                                         if($this->mCascadeRestriction) {
1226                                                 $errors[] = array( 'protectedpagetext', $right );
1227                                         } else {
1228                                                 //Nothing, user can edit!
1229                                         }
1230                                 } else {
1231                                         $errors[] = array( 'protectedpagetext', $right );
1232                                 }
1233                         }
1234                 }
1235
1236                 if ($action == 'protect') {
1237                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1238                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1239                         }
1240                 }
1241
1242                 if ($action == 'create') {
1243                         $title_protection = $this->getTitleProtection();
1244
1245                         if (is_array($title_protection)) {
1246                                 extract($title_protection);
1247
1248                                 if ($pt_create_perm == 'sysop')
1249                                         $pt_create_perm = 'protect';
1250
1251                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1252                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1253                                 }
1254                         }
1255
1256                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1257                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1258                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1259                         }
1260                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1261                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1262                 } elseif ( !$user->isAllowed( $action ) ) {
1263                         $return = null;
1264                         $groups = array();
1265                         global $wgGroupPermissions;
1266                         foreach( $wgGroupPermissions as $key => $value ) {
1267                                 if( isset( $value[$action] ) && $value[$action] == true ) {
1268                                         $groupName = User::getGroupName( $key );
1269                                         $groupPage = User::getGroupPage( $key );
1270                                         if( $groupPage ) {
1271                                                 $groups[] = '[['.$groupPage->getPrefixedText().'|'.$groupName.']]';
1272                                         } else {
1273                                                 $groups[] = $groupName;
1274                                         }
1275                                 }
1276                         }
1277                         $n = count( $groups );
1278                         $groups = implode( ', ', $groups );
1279                         switch( $n ) {
1280                                 case 0:
1281                                 case 1:
1282                                 case 2:
1283                                         $return = array( "badaccess-group$n", $groups );
1284                                         break;
1285                                 default:
1286                                         $return = array( 'badaccess-groups', $groups );
1287                         }
1288                         $errors[] = $return;
1289                 }
1290
1291                 wfProfileOut( __METHOD__ );
1292                 return $errors;
1293         }
1294
1295         /**
1296          * Is this title subject to title protection?
1297          * @return mixed An associative array representing any existent title
1298          *   protection, or false if there's none.
1299          */
1300         private function getTitleProtection() {
1301                 // Can't protect pages in special namespaces
1302                 if ( $this->getNamespace() < 0 ) {
1303                         return false;
1304                 }
1305
1306                 $dbr = wfGetDB( DB_SLAVE );
1307                 $res = $dbr->select( 'protected_titles', '*',
1308                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1309
1310                 if ($row = $dbr->fetchRow( $res )) {
1311                         return $row;
1312                 } else {
1313                         return false;
1314                 }
1315         }
1316
1317         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1318                 global $wgGroupPermissions,$wgUser,$wgContLang;
1319
1320                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1321                         && $expiry == $this->mRestrictionsExpiry) {
1322                         // No change
1323                         return true;
1324                 }
1325
1326                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1327
1328                 $dbw = wfGetDB( DB_MASTER );
1329
1330                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1331
1332                 $expiry_description = '';
1333                 if ( $encodedExpiry != 'infinity' ) {
1334                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1335                 }
1336
1337                 # Update protection table
1338                 if ($create_perm != '' ) {
1339                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1340                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1341                                         , 'pt_create_perm' => $create_perm
1342                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1343                                         , 'pt_expiry' => $encodedExpiry
1344                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1345                 } else {
1346                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1347                                 'pt_title' => $title ), __METHOD__ );
1348                 }
1349                 # Update the protection log
1350                 $log = new LogPage( 'protect' );
1351
1352                 if( $create_perm ) {
1353                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1354                 } else {
1355                         $log->addEntry( 'unprotect', $this, $reason );
1356                 }
1357
1358                 return true;
1359         }
1360
1361         /**
1362          * Remove any title protection (due to page existing
1363          */
1364         public function deleteTitleProtection() {
1365                 $dbw = wfGetDB( DB_MASTER );
1366
1367                 $dbw->delete( 'protected_titles',
1368                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1369         }
1370
1371         /**
1372          * Can $wgUser edit this page?
1373          * @return boolean
1374          * @deprecated use userCan('edit')
1375          */
1376         public function userCanEdit( $doExpensiveQueries = true ) {
1377                 return $this->userCan( 'edit', $doExpensiveQueries );
1378         }
1379
1380         /**
1381          * Can $wgUser create this page?
1382          * @return boolean
1383          * @deprecated use userCan('create')
1384          */
1385         public function userCanCreate( $doExpensiveQueries = true ) {
1386                 return $this->userCan( 'create', $doExpensiveQueries );
1387         }
1388
1389         /**
1390          * Can $wgUser move this page?
1391          * @return boolean
1392          * @deprecated use userCan('move')
1393          */
1394         public function userCanMove( $doExpensiveQueries = true ) {
1395                 return $this->userCan( 'move', $doExpensiveQueries );
1396         }
1397
1398         /**
1399          * Would anybody with sufficient privileges be able to move this page?
1400          * Some pages just aren't movable.
1401          *
1402          * @return boolean
1403          */
1404         public function isMovable() {
1405                 return MWNamespace::isMovable( $this->getNamespace() )
1406                         && $this->getInterwiki() == '';
1407         }
1408
1409         /**
1410          * Can $wgUser read this page?
1411          * @return boolean
1412          * @todo fold these checks into userCan()
1413          */
1414         public function userCanRead() {
1415                 global $wgUser, $wgGroupPermissions;
1416
1417                 $result = null;
1418                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1419                 if ( $result !== null ) {
1420                         return $result;
1421                 }
1422
1423                 # Shortcut for public wikis, allows skipping quite a bit of code
1424                 if ($wgGroupPermissions['*']['read'])
1425                         return true;
1426
1427                 if( $wgUser->isAllowed( 'read' ) ) {
1428                         return true;
1429                 } else {
1430                         global $wgWhitelistRead;
1431
1432                         /**
1433                          * Always grant access to the login page.
1434                          * Even anons need to be able to log in.
1435                         */
1436                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1437                                 return true;
1438                         }
1439
1440                         /**
1441                          * Bail out if there isn't whitelist
1442                          */
1443                         if( !is_array($wgWhitelistRead) ) {
1444                                 return false;
1445                         }
1446
1447                         /**
1448                          * Check for explicit whitelisting
1449                          */
1450                         $name = $this->getPrefixedText();
1451                         if( in_array( $name, $wgWhitelistRead, true ) )
1452                                 return true;
1453
1454                         /**
1455                          * Old settings might have the title prefixed with
1456                          * a colon for main-namespace pages
1457                          */
1458                         if( $this->getNamespace() == NS_MAIN ) {
1459                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1460                                         return true;
1461                         }
1462
1463                         /**
1464                          * If it's a special page, ditch the subpage bit
1465                          * and check again
1466                          */
1467                         if( $this->getNamespace() == NS_SPECIAL ) {
1468                                 $name = $this->getDBkey();
1469                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1470                                 if ( $name === false ) {
1471                                         # Invalid special page, but we show standard login required message
1472                                         return false;
1473                                 }
1474
1475                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1476                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1477                                         return true;
1478                         }
1479
1480                 }
1481                 return false;
1482         }
1483
1484         /**
1485          * Is this a talk page of some sort?
1486          * @return bool
1487          */
1488         public function isTalkPage() {
1489                 return MWNamespace::isTalk( $this->getNamespace() );
1490         }
1491
1492         /**
1493          * Is this a subpage?
1494          * @return bool
1495          */
1496         public function isSubpage() {
1497                 global $wgNamespacesWithSubpages;
1498
1499                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1500                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1501                 } else {
1502                         return false;
1503                 }
1504         }
1505
1506         /**
1507          * Could this page contain custom CSS or JavaScript, based
1508          * on the title?
1509          *
1510          * @return bool
1511          */
1512         public function isCssOrJsPage() {
1513                 return $this->mNamespace == NS_MEDIAWIKI
1514                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1515         }
1516
1517         /**
1518          * Is this a .css or .js subpage of a user page?
1519          * @return bool
1520          */
1521         public function isCssJsSubpage() {
1522                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1523         }
1524         /**
1525          * Is this a *valid* .css or .js subpage of a user page?
1526          * Check that the corresponding skin exists
1527          */
1528         public function isValidCssJsSubpage() {
1529                 if ( $this->isCssJsSubpage() ) {
1530                         $skinNames = Skin::getSkinNames();
1531                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1532                 } else {
1533                         return false;
1534                 }
1535         }
1536         /**
1537          * Trim down a .css or .js subpage title to get the corresponding skin name
1538          */
1539         public function getSkinFromCssJsSubpage() {
1540                 $subpage = explode( '/', $this->mTextform );
1541                 $subpage = $subpage[ count( $subpage ) - 1 ];
1542                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1543         }
1544         /**
1545          * Is this a .css subpage of a user page?
1546          * @return bool
1547          */
1548         public function isCssSubpage() {
1549                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1550         }
1551         /**
1552          * Is this a .js subpage of a user page?
1553          * @return bool
1554          */
1555         public function isJsSubpage() {
1556                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1557         }
1558         /**
1559          * Protect css/js subpages of user pages: can $wgUser edit
1560          * this page?
1561          *
1562          * @return boolean
1563          * @todo XXX: this might be better using restrictions
1564          */
1565         public function userCanEditCssJsSubpage() {
1566                 global $wgUser;
1567                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1568         }
1569
1570         /**
1571          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1572          *
1573          * @return bool If the page is subject to cascading restrictions.
1574          */
1575         public function isCascadeProtected() {
1576                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1577                 return ( $sources > 0 );
1578         }
1579
1580         /**
1581          * Cascading protection: Get the source of any cascading restrictions on this page.
1582          *
1583          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1584          * @return array( mixed title array, restriction array)
1585          * 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.
1586          * The restriction array is an array of each type, each of which contains an array of unique groups
1587          */
1588         public function getCascadeProtectionSources( $get_pages = true ) {
1589                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1590
1591                 # Define our dimension of restrictions types
1592                 $pagerestrictions = array();
1593                 foreach( $wgRestrictionTypes as $action )
1594                         $pagerestrictions[$action] = array();
1595
1596                 if (!$wgEnableCascadingProtection)
1597                         return array( false, $pagerestrictions );
1598
1599                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1600                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1601                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1602                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1603                 }
1604
1605                 wfProfileIn( __METHOD__ );
1606
1607                 $dbr = wfGetDb( DB_SLAVE );
1608
1609                 if ( $this->getNamespace() == NS_IMAGE ) {
1610                         $tables = array ('imagelinks', 'page_restrictions');
1611                         $where_clauses = array(
1612                                 'il_to' => $this->getDBkey(),
1613                                 'il_from=pr_page',
1614                                 'pr_cascade' => 1 );
1615                 } else {
1616                         $tables = array ('templatelinks', 'page_restrictions');
1617                         $where_clauses = array(
1618                                 'tl_namespace' => $this->getNamespace(),
1619                                 'tl_title' => $this->getDBkey(),
1620                                 'tl_from=pr_page',
1621                                 'pr_cascade' => 1 );
1622                 }
1623
1624                 if ( $get_pages ) {
1625                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1626                         $where_clauses[] = 'page_id=pr_page';
1627                         $tables[] = 'page';
1628                 } else {
1629                         $cols = array( 'pr_expiry' );
1630                 }
1631
1632                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1633
1634                 $sources = $get_pages ? array() : false;
1635                 $now = wfTimestampNow();
1636                 $purgeExpired = false;
1637
1638                 while( $row = $dbr->fetchObject( $res ) ) {
1639                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1640                         if( $expiry > $now ) {
1641                                 if ($get_pages) {
1642                                         $page_id = $row->pr_page;
1643                                         $page_ns = $row->page_namespace;
1644                                         $page_title = $row->page_title;
1645                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1646                                         # Add groups needed for each restriction type if its not already there
1647                                         # Make sure this restriction type still exists
1648                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1649                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1650                                         }
1651                                 } else {
1652                                         $sources = true;
1653                                 }
1654                         } else {
1655                                 // Trigger lazy purge of expired restrictions from the db
1656                                 $purgeExpired = true;
1657                         }
1658                 }
1659                 if( $purgeExpired ) {
1660                         Title::purgeExpiredRestrictions();
1661                 }
1662
1663                 wfProfileOut( __METHOD__ );
1664
1665                 if ( $get_pages ) {
1666                         $this->mCascadeSources = $sources;
1667                         $this->mCascadingRestrictions = $pagerestrictions;
1668                 } else {
1669                         $this->mHasCascadingRestrictions = $sources;
1670                 }
1671
1672                 return array( $sources, $pagerestrictions );
1673         }
1674
1675         function areRestrictionsCascading() {
1676                 if (!$this->mRestrictionsLoaded) {
1677                         $this->loadRestrictions();
1678                 }
1679
1680                 return $this->mCascadeRestriction;
1681         }
1682
1683         /**
1684          * Loads a string into mRestrictions array
1685          * @param resource $res restrictions as an SQL result.
1686          */
1687         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1688                 global $wgRestrictionTypes;
1689                 $dbr = wfGetDB( DB_SLAVE );
1690
1691                 foreach( $wgRestrictionTypes as $type ){
1692                         $this->mRestrictions[$type] = array();
1693                 }
1694
1695                 $this->mCascadeRestriction = false;
1696                 $this->mRestrictionsExpiry = Block::decodeExpiry('');
1697
1698                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1699
1700                 if ( $oldFashionedRestrictions === NULL ) {
1701                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1702                 }
1703
1704                 if ($oldFashionedRestrictions != '') {
1705
1706                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1707                                 $temp = explode( '=', trim( $restrict ) );
1708                                 if(count($temp) == 1) {
1709                                         // old old format should be treated as edit/move restriction
1710                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1711                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1712                                 } else {
1713                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1714                                 }
1715                         }
1716
1717                         $this->mOldRestrictions = true;
1718
1719                 }
1720
1721                 if( $dbr->numRows( $res ) ) {
1722                         # Current system - load second to make them override.
1723                         $now = wfTimestampNow();
1724                         $purgeExpired = false;
1725
1726                         while ($row = $dbr->fetchObject( $res ) ) {
1727                                 # Cycle through all the restrictions.
1728
1729                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1730                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1731                                         continue;
1732
1733                                 // This code should be refactored, now that it's being used more generally,
1734                                 // But I don't really see any harm in leaving it in Block for now -werdna
1735                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1736
1737                                 // Only apply the restrictions if they haven't expired!
1738                                 if ( !$expiry || $expiry > $now ) {
1739                                         $this->mRestrictionsExpiry = $expiry;
1740                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1741
1742                                         $this->mCascadeRestriction |= $row->pr_cascade;
1743                                 } else {
1744                                         // Trigger a lazy purge of expired restrictions
1745                                         $purgeExpired = true;
1746                                 }
1747                         }
1748
1749                         if( $purgeExpired ) {
1750                                 Title::purgeExpiredRestrictions();
1751                         }
1752                 }
1753
1754                 $this->mRestrictionsLoaded = true;
1755         }
1756
1757         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1758                 if( !$this->mRestrictionsLoaded ) {
1759                         if ($this->exists()) {
1760                                 $dbr = wfGetDB( DB_SLAVE );
1761
1762                                 $res = $dbr->select( 'page_restrictions', '*',
1763                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1764
1765                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1766                         } else {
1767                                 $title_protection = $this->getTitleProtection();
1768
1769                                 if (is_array($title_protection)) {
1770                                         extract($title_protection);
1771
1772                                         $now = wfTimestampNow();
1773                                         $expiry = Block::decodeExpiry($pt_expiry);
1774
1775                                         if (!$expiry || $expiry > $now) {
1776                                                 // Apply the restrictions
1777                                                 $this->mRestrictionsExpiry = $expiry;
1778                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1779                                         } else { // Get rid of the old restrictions
1780                                                 Title::purgeExpiredRestrictions();
1781                                         }
1782                                 }
1783                                 $this->mRestrictionsLoaded = true;
1784                         }
1785                 }
1786         }
1787
1788         /**
1789          * Purge expired restrictions from the page_restrictions table
1790          */
1791         static function purgeExpiredRestrictions() {
1792                 $dbw = wfGetDB( DB_MASTER );
1793                 $dbw->delete( 'page_restrictions',
1794                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1795                         __METHOD__ );
1796
1797                 $dbw->delete( 'protected_titles',
1798                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1799                         __METHOD__ );
1800         }
1801
1802         /**
1803          * Accessor/initialisation for mRestrictions
1804          *
1805          * @param string $action action that permission needs to be checked for
1806          * @return array the array of groups allowed to edit this article
1807          */
1808         public function getRestrictions( $action ) {
1809                 if( !$this->mRestrictionsLoaded ) {
1810                         $this->loadRestrictions();
1811                 }
1812                 return isset( $this->mRestrictions[$action] )
1813                                 ? $this->mRestrictions[$action]
1814                                 : array();
1815         }
1816
1817         /**
1818          * Is there a version of this page in the deletion archive?
1819          * @return int the number of archived revisions
1820          */
1821         public function isDeleted() {
1822                 $fname = 'Title::isDeleted';
1823                 if ( $this->getNamespace() < 0 ) {
1824                         $n = 0;
1825                 } else {
1826                         $dbr = wfGetDB( DB_SLAVE );
1827                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1828                                 'ar_title' => $this->getDBkey() ), $fname );
1829                         if( $this->getNamespace() == NS_IMAGE ) {
1830                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1831                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1832                         }
1833                 }
1834                 return (int)$n;
1835         }
1836
1837         /**
1838          * Get the article ID for this Title from the link cache,
1839          * adding it if necessary
1840          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1841          *      for update
1842          * @return int the ID
1843          */
1844         public function getArticleID( $flags = 0 ) {
1845                 $linkCache = LinkCache::singleton();
1846                 if ( $flags & GAID_FOR_UPDATE ) {
1847                         $oldUpdate = $linkCache->forUpdate( true );
1848                         $this->mArticleID = $linkCache->addLinkObj( $this );
1849                         $linkCache->forUpdate( $oldUpdate );
1850                 } else {
1851                         if ( -1 == $this->mArticleID ) {
1852                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1853                         }
1854                 }
1855                 return $this->mArticleID;
1856         }
1857
1858         /**
1859          * Is this an article that is a redirect page?
1860          * Uses link cache, adding it if necessary
1861          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1862          * @return bool
1863          */
1864         public function isRedirect( $flags = 0 ) {
1865                 if( !is_null($this->mRedirect) )
1866                         return $this->mRedirect;
1867                 # Zero for special pages.
1868                 # Also, calling getArticleID() loads the field from cache!
1869                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1870                         return false;
1871                 }
1872                 $linkCache = LinkCache::singleton();
1873                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1874
1875                 return $this->mRedirect;
1876         }
1877
1878         /**
1879          * What is the length of this page?
1880          * Uses link cache, adding it if necessary
1881          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1882          * @return bool
1883          */
1884         public function getLength( $flags = 0 ) {
1885                 if( $this->mLength != -1 )
1886                         return $this->mLength;
1887                 # Zero for special pages.
1888                 # Also, calling getArticleID() loads the field from cache!
1889                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1890                         return 0;
1891                 }
1892                 $linkCache = LinkCache::singleton();
1893                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
1894
1895                 return $this->mLength;
1896         }
1897
1898         /**
1899          * What is the page_latest field for this page?
1900          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1901          * @return int
1902          */
1903         public function getLatestRevID( $flags = 0 ) {
1904                 if ($this->mLatestID !== false)
1905                         return $this->mLatestID;
1906
1907                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
1908                 return $this->mLatestID = $db->selectField( 'revision',
1909                         "max(rev_id)",
1910                         array('rev_page' => $this->getArticleID()),
1911                         'Title::getLatestRevID' );
1912         }
1913
1914         /**
1915          * This clears some fields in this object, and clears any associated
1916          * keys in the "bad links" section of the link cache.
1917          *
1918          * - This is called from Article::insertNewArticle() to allow
1919          * loading of the new page_id. It's also called from
1920          * Article::doDeleteArticle()
1921          *
1922          * @param int $newid the new Article ID
1923          */
1924         public function resetArticleID( $newid ) {
1925                 $linkCache = LinkCache::singleton();
1926                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1927
1928                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1929                 else { $this->mArticleID = $newid; }
1930                 $this->mRestrictionsLoaded = false;
1931                 $this->mRestrictions = array();
1932         }
1933
1934         /**
1935          * Updates page_touched for this page; called from LinksUpdate.php
1936          * @return bool true if the update succeded
1937          */
1938         public function invalidateCache() {
1939                 global $wgUseFileCache;
1940
1941                 if ( wfReadOnly() ) {
1942                         return;
1943                 }
1944
1945                 $dbw = wfGetDB( DB_MASTER );
1946                 $success = $dbw->update( 'page',
1947                         array( /* SET */
1948                                 'page_touched' => $dbw->timestamp()
1949                         ), array( /* WHERE */
1950                                 'page_namespace' => $this->getNamespace() ,
1951                                 'page_title' => $this->getDBkey()
1952                         ), 'Title::invalidateCache'
1953                 );
1954
1955                 if ($wgUseFileCache) {
1956                         $cache = new HTMLFileCache($this);
1957                         @unlink($cache->fileCacheName());
1958                 }
1959
1960                 return $success;
1961         }
1962
1963         /**
1964          * Prefix some arbitrary text with the namespace or interwiki prefix
1965          * of this object
1966          *
1967          * @param string $name the text
1968          * @return string the prefixed text
1969          * @private
1970          */
1971         /* private */ function prefix( $name ) {
1972                 $p = '';
1973                 if ( '' != $this->mInterwiki ) {
1974                         $p = $this->mInterwiki . ':';
1975                 }
1976                 if ( 0 != $this->mNamespace ) {
1977                         $p .= $this->getNsText() . ':';
1978                 }
1979                 return $p . $name;
1980         }
1981
1982         /**
1983          * Secure and split - main initialisation function for this object
1984          *
1985          * Assumes that mDbkeyform has been set, and is urldecoded
1986          * and uses underscores, but not otherwise munged.  This function
1987          * removes illegal characters, splits off the interwiki and
1988          * namespace prefixes, sets the other forms, and canonicalizes
1989          * everything.
1990          * @return bool true on success
1991          */
1992         private function secureAndSplit() {
1993                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1994
1995                 # Initialisation
1996                 static $rxTc = false;
1997                 if( !$rxTc ) {
1998                         # Matching titles will be held as illegal.
1999                         $rxTc = '/' .
2000                                 # Any character not allowed is forbidden...
2001                                 '[^' . Title::legalChars() . ']' .
2002                                 # URL percent encoding sequences interfere with the ability
2003                                 # to round-trip titles -- you can't link to them consistently.
2004                                 '|%[0-9A-Fa-f]{2}' .
2005                                 # XML/HTML character references produce similar issues.
2006                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2007                                 '|&#[0-9]+;' .
2008                                 '|&#x[0-9A-Fa-f]+;' .
2009                                 '/S';
2010                 }
2011
2012                 $this->mInterwiki = $this->mFragment = '';
2013                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2014
2015                 $dbkey = $this->mDbkeyform;
2016
2017                 # Strip Unicode bidi override characters.
2018                 # Sometimes they slip into cut-n-pasted page titles, where the
2019                 # override chars get included in list displays.
2020                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
2021                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
2022
2023                 # Clean up whitespace
2024                 #
2025                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2026                 $dbkey = trim( $dbkey, '_' );
2027
2028                 if ( '' == $dbkey ) {
2029                         return false;
2030                 }
2031
2032                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2033                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2034                         return false;
2035                 }
2036
2037                 $this->mDbkeyform = $dbkey;
2038
2039                 # Initial colon indicates main namespace rather than specified default
2040                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2041                 if ( ':' == $dbkey{0} ) {
2042                         $this->mNamespace = NS_MAIN;
2043                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2044                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2045                 }
2046
2047                 # Namespace or interwiki prefix
2048                 $firstPass = true;
2049                 do {
2050                         $m = array();
2051                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
2052                                 $p = $m[1];
2053                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
2054                                         # Ordinary namespace
2055                                         $dbkey = $m[2];
2056                                         $this->mNamespace = $ns;
2057                                 } elseif( $this->getInterwikiLink( $p ) ) {
2058                                         if( !$firstPass ) {
2059                                                 # Can't make a local interwiki link to an interwiki link.
2060                                                 # That's just crazy!
2061                                                 return false;
2062                                         }
2063
2064                                         # Interwiki link
2065                                         $dbkey = $m[2];
2066                                         $this->mInterwiki = $wgContLang->lc( $p );
2067
2068                                         # Redundant interwiki prefix to the local wiki
2069                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2070                                                 if( $dbkey == '' ) {
2071                                                         # Can't have an empty self-link
2072                                                         return false;
2073                                                 }
2074                                                 $this->mInterwiki = '';
2075                                                 $firstPass = false;
2076                                                 # Do another namespace split...
2077                                                 continue;
2078                                         }
2079
2080                                         # If there's an initial colon after the interwiki, that also
2081                                         # resets the default namespace
2082                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2083                                                 $this->mNamespace = NS_MAIN;
2084                                                 $dbkey = substr( $dbkey, 1 );
2085                                         }
2086                                 }
2087                                 # If there's no recognized interwiki or namespace,
2088                                 # then let the colon expression be part of the title.
2089                         }
2090                         break;
2091                 } while( true );
2092
2093                 # We already know that some pages won't be in the database!
2094                 #
2095                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2096                         $this->mArticleID = 0;
2097                 }
2098                 $fragment = strstr( $dbkey, '#' );
2099                 if ( false !== $fragment ) {
2100                         $this->setFragment( $fragment );
2101                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2102                         # remove whitespace again: prevents "Foo_bar_#"
2103                         # becoming "Foo_bar_"
2104                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2105                 }
2106
2107                 # Reject illegal characters.
2108                 #
2109                 if( preg_match( $rxTc, $dbkey ) ) {
2110                         return false;
2111                 }
2112
2113                 /**
2114                  * Pages with "/./" or "/../" appearing in the URLs will
2115                  * often be unreachable due to the way web browsers deal
2116                  * with 'relative' URLs. Forbid them explicitly.
2117                  */
2118                 if ( strpos( $dbkey, '.' ) !== false &&
2119                      ( $dbkey === '.' || $dbkey === '..' ||
2120                        strpos( $dbkey, './' ) === 0  ||
2121                        strpos( $dbkey, '../' ) === 0 ||
2122                        strpos( $dbkey, '/./' ) !== false ||
2123                        strpos( $dbkey, '/../' ) !== false  ||
2124                        substr( $dbkey, -2 ) == '/.' ||
2125                        substr( $dbkey, -3 ) == '/..' ) )
2126                 {
2127                         return false;
2128                 }
2129
2130                 /**
2131                  * Magic tilde sequences? Nu-uh!
2132                  */
2133                 if( strpos( $dbkey, '~~~' ) !== false ) {
2134                         return false;
2135                 }
2136
2137                 /**
2138                  * Limit the size of titles to 255 bytes.
2139                  * This is typically the size of the underlying database field.
2140                  * We make an exception for special pages, which don't need to be stored
2141                  * in the database, and may edge over 255 bytes due to subpage syntax
2142                  * for long titles, e.g. [[Special:Block/Long name]]
2143                  */
2144                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2145                   strlen( $dbkey ) > 512 )
2146                 {
2147                         return false;
2148                 }
2149
2150                 /**
2151                  * Normally, all wiki links are forced to have
2152                  * an initial capital letter so [[foo]] and [[Foo]]
2153                  * point to the same place.
2154                  *
2155                  * Don't force it for interwikis, since the other
2156                  * site might be case-sensitive.
2157                  */
2158                 $this->mUserCaseDBKey = $dbkey;
2159                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2160                         $dbkey = $wgContLang->ucfirst( $dbkey );
2161                 }
2162
2163                 /**
2164                  * Can't make a link to a namespace alone...
2165                  * "empty" local links can only be self-links
2166                  * with a fragment identifier.
2167                  */
2168                 if( $dbkey == '' &&
2169                         $this->mInterwiki == '' &&
2170                         $this->mNamespace != NS_MAIN ) {
2171                         return false;
2172                 }
2173                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2174                 // IP names are not allowed for accounts, and can only be referring to
2175                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2176                 // there are numerous ways to present the same IP. Having sp:contribs scan
2177                 // them all is silly and having some show the edits and others not is
2178                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2179                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2180                         IP::sanitizeIP( $dbkey ) : $dbkey;
2181                 // Any remaining initial :s are illegal.
2182                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2183                         return false;
2184                 }
2185
2186                 # Fill fields
2187                 $this->mDbkeyform = $dbkey;
2188                 $this->mUrlform = wfUrlencode( $dbkey );
2189
2190                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2191
2192                 return true;
2193         }
2194
2195         /**
2196          * Set the fragment for this title
2197          * This is kind of bad, since except for this rarely-used function, Title objects
2198          * are immutable. The reason this is here is because it's better than setting the
2199          * members directly, which is what Linker::formatComment was doing previously.
2200          *
2201          * @param string $fragment text
2202          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2203          */
2204         public function setFragment( $fragment ) {
2205                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2206         }
2207
2208         /**
2209          * Get a Title object associated with the talk page of this article
2210          * @return Title the object for the talk page
2211          */
2212         public function getTalkPage() {
2213                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2214         }
2215
2216         /**
2217          * Get a title object associated with the subject page of this
2218          * talk page
2219          *
2220          * @return Title the object for the subject page
2221          */
2222         public function getSubjectPage() {
2223                 return Title::makeTitle( MWNamespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2224         }
2225
2226         /**
2227          * Get an array of Title objects linking to this Title
2228          * Also stores the IDs in the link cache.
2229          *
2230          * WARNING: do not use this function on arbitrary user-supplied titles!
2231          * On heavily-used templates it will max out the memory.
2232          *
2233          * @param string $options may be FOR UPDATE
2234          * @return array the Title objects linking here
2235          */
2236         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2237                 $linkCache = LinkCache::singleton();
2238
2239                 if ( $options ) {
2240                         $db = wfGetDB( DB_MASTER );
2241                 } else {
2242                         $db = wfGetDB( DB_SLAVE );
2243                 }
2244
2245                 $res = $db->select( array( 'page', $table ),
2246                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2247                         array(
2248                                 "{$prefix}_from=page_id",
2249                                 "{$prefix}_namespace" => $this->getNamespace(),
2250                                 "{$prefix}_title"     => $this->getDBkey() ),
2251                         'Title::getLinksTo',
2252                         $options );
2253
2254                 $retVal = array();
2255                 if ( $db->numRows( $res ) ) {
2256                         while ( $row = $db->fetchObject( $res ) ) {
2257                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2258                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2259                                         $retVal[] = $titleObj;
2260                                 }
2261                         }
2262                 }
2263                 $db->freeResult( $res );
2264                 return $retVal;
2265         }
2266
2267         /**
2268          * Get an array of Title objects using this Title as a template
2269          * Also stores the IDs in the link cache.
2270          *
2271          * WARNING: do not use this function on arbitrary user-supplied titles!
2272          * On heavily-used templates it will max out the memory.
2273          *
2274          * @param string $options may be FOR UPDATE
2275          * @return array the Title objects linking here
2276          */
2277         public function getTemplateLinksTo( $options = '' ) {
2278                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2279         }
2280
2281         /**
2282          * Get an array of Title objects referring to non-existent articles linked from this page
2283          *
2284          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2285          * @param string $options may be FOR UPDATE
2286          * @return array the Title objects
2287          */
2288         public function getBrokenLinksFrom( $options = '' ) {
2289                 if ( $this->getArticleId() == 0 ) {
2290                         # All links from article ID 0 are false positives
2291                         return array();
2292                 }
2293
2294                 if ( $options ) {
2295                         $db = wfGetDB( DB_MASTER );
2296                 } else {
2297                         $db = wfGetDB( DB_SLAVE );
2298                 }
2299
2300                 $res = $db->safeQuery(
2301                           "SELECT pl_namespace, pl_title
2302                              FROM !
2303                         LEFT JOIN !
2304                                ON pl_namespace=page_namespace
2305                               AND pl_title=page_title
2306                             WHERE pl_from=?
2307                               AND page_namespace IS NULL
2308                                   !",
2309                         $db->tableName( 'pagelinks' ),
2310                         $db->tableName( 'page' ),
2311                         $this->getArticleId(),
2312                         $options );
2313
2314                 $retVal = array();
2315                 if ( $db->numRows( $res ) ) {
2316                         while ( $row = $db->fetchObject( $res ) ) {
2317                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2318                         }
2319                 }
2320                 $db->freeResult( $res );
2321                 return $retVal;
2322         }
2323
2324
2325         /**
2326          * Get a list of URLs to purge from the Squid cache when this
2327          * page changes
2328          *
2329          * @return array the URLs
2330          */
2331         public function getSquidURLs() {
2332                 global $wgContLang;
2333
2334                 $urls = array(
2335                         $this->getInternalURL(),
2336                         $this->getInternalURL( 'action=history' )
2337                 );
2338
2339                 // purge variant urls as well
2340                 if($wgContLang->hasVariants()){
2341                         $variants = $wgContLang->getVariants();
2342                         foreach($variants as $vCode){
2343                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2344                                 $urls[] = $this->getInternalURL('',$vCode);
2345                         }
2346                 }
2347
2348                 return $urls;
2349         }
2350
2351         public function purgeSquid() {
2352                 global $wgUseSquid;
2353                 if ( $wgUseSquid ) {
2354                         $urls = $this->getSquidURLs();
2355                         $u = new SquidUpdate( $urls );
2356                         $u->doUpdate();
2357                 }
2358         }
2359
2360         /**
2361          * Move this page without authentication
2362          * @param Title &$nt the new page Title
2363          */
2364         public function moveNoAuth( &$nt ) {
2365                 return $this->moveTo( $nt, false );
2366         }
2367
2368         /**
2369          * Check whether a given move operation would be valid.
2370          * Returns true if ok, or a message key string for an error message
2371          * if invalid. (Scarrrrry ugly interface this.)
2372          * @param Title &$nt the new title
2373          * @param bool $auth indicates whether $wgUser's permissions
2374          *      should be checked
2375          * @return mixed true on success, message name on failure
2376          */
2377         public function isValidMoveOperation( &$nt, $auth = true ) {
2378                 if( !$this or !$nt ) {
2379                         return 'badtitletext';
2380                 }
2381                 if( $this->equals( $nt ) ) {
2382                         return 'selfmove';
2383                 }
2384                 if( !$this->isMovable() || !$nt->isMovable() ) {
2385                         return 'immobile_namespace';
2386                 }
2387
2388                 $oldid = $this->getArticleID();
2389                 $newid = $nt->getArticleID();
2390
2391                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2392                         return 'articleexists';
2393                 }
2394                 if ( ( '' == $this->getDBkey() ) ||
2395                          ( !$oldid ) ||
2396                      ( '' == $nt->getDBkey() ) ) {
2397                         return 'badarticleerror';
2398                 }
2399
2400                 // Image-specific checks
2401                 if( $this->getNamespace() == NS_IMAGE ) {
2402                         $file = wfLocalFile( $this );
2403                         if( $file->exists() ) {
2404                                 if( $nt->getNamespace() != NS_IMAGE ) {
2405                                         return 'imagenocrossnamespace';
2406                                 }
2407                                 if( !File::checkExtensionCompatibility( $file, $nt->getDbKey() ) ) {
2408                                         return 'imagetypemismatch';
2409                                 }
2410                         }
2411                 }
2412
2413                 if ( $auth ) {
2414                         global $wgUser;
2415                         $errors = array_merge($this->getUserPermissionsErrors('move', $wgUser),
2416                                         $this->getUserPermissionsErrors('edit', $wgUser),
2417                                         $nt->getUserPermissionsErrors('move', $wgUser),
2418                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2419                         if($errors !== array())
2420                                 return $errors[0][0];
2421                 }
2422
2423                 global $wgUser;
2424                 $err = null;
2425                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err ) ) ) {
2426                         return 'hookaborted';
2427                 }
2428
2429                 # The move is allowed only if (1) the target doesn't exist, or
2430                 # (2) the target is a redirect to the source, and has no history
2431                 # (so we can undo bad moves right after they're done).
2432
2433                 if ( 0 != $newid ) { # Target exists; check for validity
2434                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2435                                 return 'articleexists';
2436                         }
2437                 } else {
2438                         $tp = $nt->getTitleProtection();
2439                         if ( $tp and !$wgUser->isAllowed( $tp['pt_create_perm'] ) ) {
2440                                 return 'cantmove-titleprotected';
2441                         }
2442                 }
2443                 return true;
2444         }
2445
2446         /**
2447          * Move a title to a new location
2448          * @param Title &$nt the new title
2449          * @param bool $auth indicates whether $wgUser's permissions
2450          *      should be checked
2451          * @param string $reason The reason for the move
2452          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2453          *  Ignored if the user doesn't have the suppressredirect right.
2454          * @return mixed true on success, message name on failure
2455          */
2456         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2457                 $err = $this->isValidMoveOperation( $nt, $auth );
2458                 if( is_string( $err ) ) {
2459                         return $err;
2460                 }
2461
2462                 $pageid = $this->getArticleID();
2463                 if( $nt->exists() ) {
2464                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2465                         $pageCountChange = ($createRedirect ? 0 : -1);
2466                 } else { # Target didn't exist, do normal move.
2467                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2468                         $pageCountChange = ($createRedirect ? 1 : 0);
2469                 }
2470                 if( is_string( $err ) ) {
2471                         return $err;
2472                 }
2473                 $redirid = $this->getArticleID();
2474
2475                 // Category memberships include a sort key which may be customized.
2476                 // If it's left as the default (the page title), we need to update
2477                 // the sort key to match the new title.
2478                 //
2479                 // Be careful to avoid resetting cl_timestamp, which may disturb
2480                 // time-based lists on some sites.
2481                 //
2482                 // Warning -- if the sort key is *explicitly* set to the old title,
2483                 // we can't actually distinguish it from a default here, and it'll
2484                 // be set to the new title even though it really shouldn't.
2485                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2486                 $dbw = wfGetDB( DB_MASTER );
2487                 $dbw->update( 'categorylinks',
2488                         array(
2489                                 'cl_sortkey' => $nt->getPrefixedText(),
2490                                 'cl_timestamp=cl_timestamp' ),
2491                         array(
2492                                 'cl_from' => $pageid,
2493                                 'cl_sortkey' => $this->getPrefixedText() ),
2494                         __METHOD__ );
2495
2496                 # Update watchlists
2497
2498                 $oldnamespace = $this->getNamespace() & ~1;
2499                 $newnamespace = $nt->getNamespace() & ~1;
2500                 $oldtitle = $this->getDBkey();
2501                 $newtitle = $nt->getDBkey();
2502
2503                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2504                         WatchedItem::duplicateEntries( $this, $nt );
2505                 }
2506
2507                 # Update search engine
2508                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2509                 $u->doUpdate();
2510                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2511                 $u->doUpdate();
2512
2513                 # Update site_stats
2514                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2515                         # No longer a content page
2516                         # Not viewed, edited, removing
2517                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2518                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2519                         # Now a content page
2520                         # Not viewed, edited, adding
2521                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2522                 } elseif( $pageCountChange ) {
2523                         # Redirect added
2524                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2525                 } else {
2526                         # Nothing special
2527                         $u = false;
2528                 }
2529                 if( $u )
2530                         $u->doUpdate();
2531                 # Update message cache for interface messages
2532                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2533                         global $wgMessageCache;
2534                         $oldarticle = new Article( $this );
2535                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2536                         $newarticle = new Article( $nt );
2537                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2538                 }
2539
2540                 global $wgUser;
2541                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2542                 return true;
2543         }
2544
2545         /**
2546          * Move page to a title which is at present a redirect to the
2547          * source page
2548          *
2549          * @param Title &$nt the page to move to, which should currently
2550          *      be a redirect
2551          * @param string $reason The reason for the move
2552          * @param bool $createRedirect Whether to leave a redirect at the old title.
2553          *  Ignored if the user doesn't have the suppressredirect right
2554          */
2555         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2556                 global $wgUseSquid, $wgUser;
2557                 $fname = 'Title::moveOverExistingRedirect';
2558                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2559
2560                 if ( $reason ) {
2561                         $comment .= ": $reason";
2562                 }
2563
2564                 $now = wfTimestampNow();
2565                 $newid = $nt->getArticleID();
2566                 $oldid = $this->getArticleID();
2567                 $dbw = wfGetDB( DB_MASTER );
2568
2569                 # Move an image if it is
2570                 if( $this->getNamespace() == NS_IMAGE ) {
2571                         $file = wfLocalFile( $this );
2572                         if( $file->exists() ) {
2573                                 $status = $file->move( $nt );
2574                                 if( !$status->isOk() ) {
2575                                         return $status->getWikiText();
2576                                 }
2577                         }
2578                 }
2579
2580                 # Delete the old redirect. We don't save it to history since
2581                 # by definition if we've got here it's rather uninteresting.
2582                 # We have to remove it so that the next step doesn't trigger
2583                 # a conflict on the unique namespace+title index...
2584                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2585                 if ( !$dbw->cascadingDeletes() ) {
2586                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2587                         global $wgUseTrackbacks;
2588                         if ($wgUseTrackbacks)
2589                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2590                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2591                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2592                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2593                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2594                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2595                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2596                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2597                 }
2598
2599                 # Save a null revision in the page's history notifying of the move
2600                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2601                 $nullRevId = $nullRevision->insertOn( $dbw );
2602
2603                 # Change the name of the target page:
2604                 $dbw->update( 'page',
2605                         /* SET */ array(
2606                                 'page_touched'   => $dbw->timestamp($now),
2607                                 'page_namespace' => $nt->getNamespace(),
2608                                 'page_title'     => $nt->getDBkey(),
2609                                 'page_latest'    => $nullRevId,
2610                         ),
2611                         /* WHERE */ array( 'page_id' => $oldid ),
2612                         $fname
2613                 );
2614                 $nt->resetArticleID( $oldid );
2615
2616                 # Recreate the redirect, this time in the other direction.
2617                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2618                 {
2619                         $mwRedir = MagicWord::get( 'redirect' );
2620                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2621                         $redirectArticle = new Article( $this );
2622                         $newid = $redirectArticle->insertOn( $dbw );
2623                         $redirectRevision = new Revision( array(
2624                                 'page'    => $newid,
2625                                 'comment' => $comment,
2626                                 'text'    => $redirectText ) );
2627                         $redirectRevision->insertOn( $dbw );
2628                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2629
2630                         # Now, we record the link from the redirect to the new title.
2631                         # It should have no other outgoing links...
2632                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2633                         $dbw->insert( 'pagelinks',
2634                                 array(
2635                                         'pl_from'      => $newid,
2636                                         'pl_namespace' => $nt->getNamespace(),
2637                                         'pl_title'     => $nt->getDBkey() ),
2638                                 $fname );
2639                 } else {
2640                         $this->resetArticleID( 0 );
2641                 }
2642
2643                 # Log the move
2644                 $log = new LogPage( 'move' );
2645                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2646
2647                 # Purge squid
2648                 if ( $wgUseSquid ) {
2649                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2650                         $u = new SquidUpdate( $urls );
2651                         $u->doUpdate();
2652                 }
2653         }
2654
2655         /**
2656          * Move page to non-existing title.
2657          * @param Title &$nt the new Title
2658          * @param string $reason The reason for the move
2659          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2660          *  Ignored if the user doesn't have the suppressredirect right
2661          */
2662         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2663                 global $wgUseSquid, $wgUser;
2664                 $fname = 'MovePageForm::moveToNewTitle';
2665                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2666                 if ( $reason ) {
2667                         $comment .= ": $reason";
2668                 }
2669
2670                 $newid = $nt->getArticleID();
2671                 $oldid = $this->getArticleID();
2672                 $dbw = wfGetDB( DB_MASTER );
2673                 $now = $dbw->timestamp();
2674
2675                 # Move an image if it is
2676                 if( $this->getNamespace() == NS_IMAGE ) {
2677                         $file = wfLocalFile( $this );
2678                         if( $file->exists() ) {
2679                                 $status = $file->move( $nt );
2680                                 if( !$status->isOk() ) {
2681                                         return $status->getWikiText();
2682                                 }
2683                         }
2684                 }
2685
2686                 # Save a null revision in the page's history notifying of the move
2687                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2688                 $nullRevId = $nullRevision->insertOn( $dbw );
2689
2690                 # Rename page entry
2691                 $dbw->update( 'page',
2692                         /* SET */ array(
2693                                 'page_touched'   => $now,
2694                                 'page_namespace' => $nt->getNamespace(),
2695                                 'page_title'     => $nt->getDBkey(),
2696                                 'page_latest'    => $nullRevId,
2697                         ),
2698                         /* WHERE */ array( 'page_id' => $oldid ),
2699                         $fname
2700                 );
2701                 $nt->resetArticleID( $oldid );
2702
2703                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2704                 {
2705                         # Insert redirect
2706                         $mwRedir = MagicWord::get( 'redirect' );
2707                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2708                         $redirectArticle = new Article( $this );
2709                         $newid = $redirectArticle->insertOn( $dbw );
2710                         $redirectRevision = new Revision( array(
2711                                 'page'    => $newid,
2712                                 'comment' => $comment,
2713                                 'text'    => $redirectText ) );
2714                         $redirectRevision->insertOn( $dbw );
2715                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2716
2717                         # Record the just-created redirect's linking to the page
2718                         $dbw->insert( 'pagelinks',
2719                                 array(
2720                                         'pl_from'      => $newid,
2721                                         'pl_namespace' => $nt->getNamespace(),
2722                                         'pl_title'     => $nt->getDBkey() ),
2723                                 $fname );
2724                 } else {
2725                         $this->resetArticleID( 0 );
2726                 }
2727
2728                 # Log the move
2729                 $log = new LogPage( 'move' );
2730                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2731
2732                 # Purge caches as per article creation
2733                 Article::onArticleCreate( $nt );
2734
2735                 # Purge old title from squid
2736                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2737                 $this->purgeSquid();
2738         }
2739
2740         /**
2741          * Checks if $this can be moved to a given Title
2742          * - Selects for update, so don't call it unless you mean business
2743          *
2744          * @param Title &$nt the new title to check
2745          */
2746         public function isValidMoveTarget( $nt ) {
2747
2748                 $fname = 'Title::isValidMoveTarget';
2749                 $dbw = wfGetDB( DB_MASTER );
2750
2751                 # Is it an existsing file?
2752                 if( $nt->getNamespace() == NS_IMAGE ) {
2753                         $file = wfLocalFile( $nt );
2754                         if( $file->exists() ) {
2755                                 wfDebug( __METHOD__ . ": file exists\n" );
2756                                 return false;
2757                         }
2758                 }
2759
2760                 # Is it a redirect?
2761                 $id  = $nt->getArticleID();
2762                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2763                         array( 'page_is_redirect','old_text','old_flags' ),
2764                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2765                         $fname, 'FOR UPDATE' );
2766
2767                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2768                         # Not a redirect
2769                         wfDebug( __METHOD__ . ": not a redirect\n" );
2770                         return false;
2771                 }
2772                 $text = Revision::getRevisionText( $obj );
2773
2774                 # Does the redirect point to the source?
2775                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2776                 $m = array();
2777                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2778                         $redirTitle = Title::newFromText( $m[1] );
2779                         if( !is_object( $redirTitle ) ||
2780                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2781                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2782                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2783                                 return false;
2784                         }
2785                 } else {
2786                         # Fail safe
2787                         wfDebug( __METHOD__ . ": failsafe\n" );
2788                         return false;
2789                 }
2790
2791                 # Does the article have a history?
2792                 $row = $dbw->selectRow( array( 'page', 'revision'),
2793                         array( 'rev_id' ),
2794                         array( 'page_namespace' => $nt->getNamespace(),
2795                                 'page_title' => $nt->getDBkey(),
2796                                 'page_id=rev_page AND page_latest != rev_id'
2797                         ), $fname, 'FOR UPDATE'
2798                 );
2799
2800                 # Return true if there was no history
2801                 return $row === false;
2802         }
2803
2804         /**
2805          * Can this title be added to a user's watchlist?
2806          *
2807          * @return bool
2808          */
2809         public function isWatchable() {
2810                 return !$this->isExternal()
2811                         && MWNamespace::isWatchable( $this->getNamespace() );
2812         }
2813
2814         /**
2815          * Get categories to which this Title belongs and return an array of
2816          * categories' names.
2817          *
2818          * @return array an array of parents in the form:
2819          *      $parent => $currentarticle
2820          */
2821         public function getParentCategories() {
2822                 global $wgContLang;
2823
2824                 $titlekey = $this->getArticleId();
2825                 $dbr = wfGetDB( DB_SLAVE );
2826                 $categorylinks = $dbr->tableName( 'categorylinks' );
2827
2828                 # NEW SQL
2829                 $sql = "SELECT * FROM $categorylinks"
2830                      ." WHERE cl_from='$titlekey'"
2831                          ." AND cl_from <> '0'"
2832                          ." ORDER BY cl_sortkey";
2833
2834                 $res = $dbr->query ( $sql ) ;
2835
2836                 if($dbr->numRows($res) > 0) {
2837                         while ( $x = $dbr->fetchObject ( $res ) )
2838                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2839                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2840                         $dbr->freeResult ( $res ) ;
2841                 } else {
2842                         $data = array();
2843                 }
2844                 return $data;
2845         }
2846
2847         /**
2848          * Get a tree of parent categories
2849          * @param array $children an array with the children in the keys, to check for circular refs
2850          * @return array
2851          */
2852         public function getParentCategoryTree( $children = array() ) {
2853                 $stack = array();
2854                 $parents = $this->getParentCategories();
2855
2856                 if($parents != '') {
2857                         foreach($parents as $parent => $current) {
2858                                 if ( array_key_exists( $parent, $children ) ) {
2859                                         # Circular reference
2860                                         $stack[$parent] = array();
2861                                 } else {
2862                                         $nt = Title::newFromText($parent);
2863                                         if ( $nt ) {
2864                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2865                                         }
2866                                 }
2867                         }
2868                         return $stack;
2869                 } else {
2870                         return array();
2871                 }
2872         }
2873
2874
2875         /**
2876          * Get an associative array for selecting this title from
2877          * the "page" table
2878          *
2879          * @return array
2880          */
2881         public function pageCond() {
2882                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2883         }
2884
2885         /**
2886          * Get the revision ID of the previous revision
2887          *
2888          * @param integer $revision  Revision ID. Get the revision that was before this one.
2889          * @return integer $oldrevision|false
2890          */
2891         public function getPreviousRevisionID( $revision ) {
2892                 $dbr = wfGetDB( DB_SLAVE );
2893                 return $dbr->selectField( 'revision', 'rev_id',
2894                         'rev_page=' . intval( $this->getArticleId() ) .
2895                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2896         }
2897
2898         /**
2899          * Get the revision ID of the next revision
2900          *
2901          * @param integer $revision  Revision ID. Get the revision that was after this one.
2902          * @return integer $oldrevision|false
2903          */
2904         public function getNextRevisionID( $revision ) {
2905                 $dbr = wfGetDB( DB_SLAVE );
2906                 return $dbr->selectField( 'revision', 'rev_id',
2907                         'rev_page=' . intval( $this->getArticleId() ) .
2908                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2909         }
2910
2911         /**
2912          * Get the number of revisions between the given revision IDs.
2913          * Used for diffs and other things that really need it.
2914          *
2915          * @param integer $old  Revision ID.
2916          * @param integer $new  Revision ID.
2917          * @return integer  Number of revisions between these IDs.
2918          */
2919         public function countRevisionsBetween( $old, $new ) {
2920                 $dbr = wfGetDB( DB_SLAVE );
2921                 return $dbr->selectField( 'revision', 'count(*)',
2922                         'rev_page = ' . intval( $this->getArticleId() ) .
2923                         ' AND rev_id > ' . intval( $old ) .
2924                         ' AND rev_id < ' . intval( $new ),
2925                         __METHOD__,
2926                         array( 'USE INDEX' => 'PRIMARY' ) );
2927         }
2928
2929         /**
2930          * Compare with another title.
2931          *
2932          * @param Title $title
2933          * @return bool
2934          */
2935         public function equals( $title ) {
2936                 // Note: === is necessary for proper matching of number-like titles.
2937                 return $this->getInterwiki() === $title->getInterwiki()
2938                         && $this->getNamespace() == $title->getNamespace()
2939                         && $this->getDBkey() === $title->getDBkey();
2940         }
2941
2942         /**
2943          * Callback for usort() to do title sorts by (namespace, title)
2944          */
2945         static function compare( $a, $b ) {
2946                 if( $a->getNamespace() == $b->getNamespace() ) {
2947                         return strcmp( $a->getText(), $b->getText() );
2948                 } else {
2949                         return $a->getNamespace() - $b->getNamespace();
2950                 }
2951         }
2952
2953         /**
2954          * Return a string representation of this title
2955          *
2956          * @return string
2957          */
2958         public function __toString() {
2959                 return $this->getPrefixedText();
2960         }
2961
2962         /**
2963          * Check if page exists
2964          * @return bool
2965          */
2966         public function exists() {
2967                 return $this->getArticleId() != 0;
2968         }
2969
2970         /**
2971          * Do we know that this title definitely exists, or should we otherwise
2972          * consider that it exists?
2973          *
2974          * @return bool
2975          */
2976         public function isAlwaysKnown() {
2977                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
2978                 // the full l10n of that language to be loaded. That takes much memory and
2979                 // isn't needed. So we strip the language part away.
2980                 // Also, extension messages which are not loaded, are shown as red, because
2981                 // we don't call MessageCache::loadAllMessages.
2982                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
2983                 return $this->isExternal()
2984                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
2985                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
2986         }
2987
2988         /**
2989          * Update page_touched timestamps and send squid purge messages for
2990          * pages linking to this title. May be sent to the job queue depending
2991          * on the number of links. Typically called on create and delete.
2992          */
2993         public function touchLinks() {
2994                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2995                 $u->doUpdate();
2996
2997                 if ( $this->getNamespace() == NS_CATEGORY ) {
2998                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2999                         $u->doUpdate();
3000                 }
3001         }
3002
3003         /**
3004          * Get the last touched timestamp
3005          */
3006         public function getTouched() {
3007                 $dbr = wfGetDB( DB_SLAVE );
3008                 $touched = $dbr->selectField( 'page', 'page_touched',
3009                         array(
3010                                 'page_namespace' => $this->getNamespace(),
3011                                 'page_title' => $this->getDBkey()
3012                         ), __METHOD__
3013                 );
3014                 return $touched;
3015         }
3016
3017         public function trackbackURL() {
3018                 global $wgTitle, $wgScriptPath, $wgServer;
3019
3020                 return "$wgServer$wgScriptPath/trackback.php?article="
3021                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
3022         }
3023
3024         public function trackbackRDF() {
3025                 $url = htmlspecialchars($this->getFullURL());
3026                 $title = htmlspecialchars($this->getText());
3027                 $tburl = $this->trackbackURL();
3028
3029                 // Autodiscovery RDF is placed in comments so HTML validator
3030                 // won't barf. This is a rather icky workaround, but seems
3031                 // frequently used by this kind of RDF thingy.
3032                 //
3033                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3034                 return "<!--
3035 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3036          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3037          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3038 <rdf:Description
3039    rdf:about=\"$url\"
3040    dc:identifier=\"$url\"
3041    dc:title=\"$title\"
3042    trackback:ping=\"$tburl\" />
3043 </rdf:RDF>
3044 -->";
3045         }
3046
3047         /**
3048          * Generate strings used for xml 'id' names in monobook tabs
3049          * @return string
3050          */
3051         public function getNamespaceKey() {
3052                 global $wgContLang;
3053                 switch ($this->getNamespace()) {
3054                         case NS_MAIN:
3055                         case NS_TALK:
3056                                 return 'nstab-main';
3057                         case NS_USER:
3058                         case NS_USER_TALK:
3059                                 return 'nstab-user';
3060                         case NS_MEDIA:
3061                                 return 'nstab-media';
3062                         case NS_SPECIAL:
3063                                 return 'nstab-special';
3064                         case NS_PROJECT:
3065                         case NS_PROJECT_TALK:
3066                                 return 'nstab-project';
3067                         case NS_IMAGE:
3068                         case NS_IMAGE_TALK:
3069                                 return 'nstab-image';
3070                         case NS_MEDIAWIKI:
3071                         case NS_MEDIAWIKI_TALK:
3072                                 return 'nstab-mediawiki';
3073                         case NS_TEMPLATE:
3074                         case NS_TEMPLATE_TALK:
3075                                 return 'nstab-template';
3076                         case NS_HELP:
3077                         case NS_HELP_TALK:
3078                                 return 'nstab-help';
3079                         case NS_CATEGORY:
3080                         case NS_CATEGORY_TALK:
3081                                 return 'nstab-category';
3082                         default:
3083                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3084                 }
3085         }
3086
3087         /**
3088          * Returns true if this title resolves to the named special page
3089          * @param string $name The special page name
3090          */
3091         public function isSpecial( $name ) {
3092                 if ( $this->getNamespace() == NS_SPECIAL ) {
3093                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3094                         if ( $name == $thisName ) {
3095                                 return true;
3096                         }
3097                 }
3098                 return false;
3099         }
3100
3101         /**
3102          * If the Title refers to a special page alias which is not the local default,
3103          * returns a new Title which points to the local default. Otherwise, returns $this.
3104          */
3105         public function fixSpecialName() {
3106                 if ( $this->getNamespace() == NS_SPECIAL ) {
3107                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3108                         if ( $canonicalName ) {
3109                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3110                                 if ( $localName != $this->mDbkeyform ) {
3111                                         return Title::makeTitle( NS_SPECIAL, $localName );
3112                                 }
3113                         }
3114                 }
3115                 return $this;
3116         }
3117
3118         /**
3119          * Is this Title in a namespace which contains content?
3120          * In other words, is this a content page, for the purposes of calculating
3121          * statistics, etc?
3122          *
3123          * @return bool
3124          */
3125         public function isContentPage() {
3126                 return MWNamespace::isContent( $this->getNamespace() );
3127         }
3128
3129         public function getRedirectsHere() {
3130                 $redirs = array();
3131                 $dbr = wfGetDB( DB_SLAVE );
3132                 list($page,$redirect) = $dbr->tableNamesN( 'page', 'redirect' );
3133                 $result = $dbr->query( "SELECT page_title, page_namespace FROM $page JOIN $redirect ON page_id = rd_from WHERE rd_title = "
3134                         . $dbr->addQuotes( $this->getDBKey() ) . " AND rd_namespace = " . $this->getNamespace(), __METHOD__ );
3135                 while( $row = $dbr->fetchObject( $result ) ) {
3136                         $redirs[] = self::newFromRow( $row );
3137                 }
3138                 return $redirs;
3139         }
3140 }