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 $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  51         var $mInterwiki;                # Interwiki prefix (or null string)
  52         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  53         var $mArticleID;                # Article ID, fetched from the link cache on demand
  54         var $mLatestID;                 # ID of most recent revision
  55         var $mRestrictions;             # Array of groups allowed to edit this article
  56         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  57         var $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  58         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  59         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  60         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  61         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  62         var $mDefaultNamespace;         # Namespace index when there is no namespace
  63                                         # Zero except in {{transclusion}} tags
  64         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  65         /**#@-*/
  66
  67
  68         /**
  69          * Constructor
  70          * @private
  71          */
  72         /* private */ function __construct() {
  73                 $this->mInterwiki = $this->mUrlform =
  74                 $this->mTextform = $this->mDbkeyform = '';
  75                 $this->mArticleID = -1;
  76                 $this->mNamespace = NS_MAIN;
  77                 $this->mRestrictionsLoaded = false;
  78                 $this->mRestrictions = array();
  79                 # Dont change the following, NS_MAIN is hardcoded in several place
  80                 # See bug #696
  81                 $this->mDefaultNamespace = NS_MAIN;
  82                 $this->mWatched = NULL;
  83                 $this->mLatestID = false;
  84                 $this->mOldRestrictions = false;
  85         }
  86
  87         /**
  88          * Create a new Title from a prefixed DB key
  89          * @param string $key The database key, which has underscores
  90          *      instead of spaces, possibly including namespace and
  91          *      interwiki prefixes
  92          * @return Title the new object, or NULL on an error
  93          */
  94         public static function newFromDBkey( $key ) {
  95                 $t = new Title();
  96                 $t->mDbkeyform = $key;
  97                 if( $t->secureAndSplit() )
  98                         return $t;
  99                 else
 100                         return NULL;
 101         }
 102
 103         /**
 104          * Create a new Title from text, such as what one would
 105          * find in a link. Decodes any HTML entities in the text.
 106          *
 107          * @param string $text the link text; spaces, prefixes,
 108          *      and an initial ':' indicating the main namespace
 109          *      are accepted
 110          * @param int $defaultNamespace the namespace to use if
 111          *      none is specified by a prefix
 112          * @return Title the new object, or NULL on an error
 113          */
 114         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 115                 if( is_object( $text ) ) {
 116                         throw new MWException( 'Title::newFromText given an object' );
 117                 }
 118
 119                 /**
 120                  * Wiki pages often contain multiple links to the same page.
 121                  * Title normalization and parsing can become expensive on
 122                  * pages with many links, so we can save a little time by
 123                  * caching them.
 124                  *
 125                  * In theory these are value objects and won't get changed...
 126                  */
 127                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 128                         return Title::$titleCache[$text];
 129                 }
 130
 131                 /**
 132                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 133                  */
 134                 $filteredText = Sanitizer::decodeCharReferences( $text );
 135
 136                 $t = new Title();
 137                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 138                 $t->mDefaultNamespace = $defaultNamespace;
 139
 140                 static $cachedcount = 0 ;
 141                 if( $t->secureAndSplit() ) {
 142                         if( $defaultNamespace == NS_MAIN ) {
 143                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 144                                         # Avoid memory leaks on mass operations...
 145                                         Title::$titleCache = array();
 146                                         $cachedcount=0;
 147                                 }
 148                                 $cachedcount++;
 149                                 Title::$titleCache[$text] =& $t;
 150                         }
 151                         return $t;
 152                 } else {
 153                         $ret = NULL;
 154                         return $ret;
 155                 }
 156         }
 157
 158         /**
 159          * Create a new Title from URL-encoded text. Ensures that
 160          * the given title's length does not exceed the maximum.
 161          * @param string $url the title, as might be taken from a URL
 162          * @return Title the new object, or NULL on an error
 163          */
 164         public static function newFromURL( $url ) {
 165                 global $wgLegalTitleChars;
 166                 $t = new Title();
 167
 168                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 169                 # but some URLs used it as a space replacement and they still come
 170                 # from some external search tools.
 171                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 172                         $url = str_replace( '+', ' ', $url );
 173                 }
 174
 175                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 176                 if( $t->secureAndSplit() ) {
 177                         return $t;
 178                 } else {
 179                         return NULL;
 180                 }
 181         }
 182
 183         /**
 184          * Create a new Title from an article ID
 185          *
 186          * @todo This is inefficiently implemented, the page row is requested
 187          *       but not used for anything else
 188          *
 189          * @param int $id the page_id corresponding to the Title to create
 190          * @return Title the new object, or NULL on an error
 191          */
 192         public static function newFromID( $id ) {
 193                 $fname = 'Title::newFromID';
 194                 $dbr = wfGetDB( DB_SLAVE );
 195                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 196                         array( 'page_id' => $id ), $fname );
 197                 if ( $row !== false ) {
 198                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 199                 } else {
 200                         $title = NULL;
 201                 }
 202                 return $title;
 203         }
 204
 205         /**
 206          * Make an array of titles from an array of IDs
 207          */
 208         public static function newFromIDs( $ids ) {
 209                 $dbr = wfGetDB( DB_SLAVE );
 210                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 211                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 212
 213                 $titles = array();
 214                 while ( $row = $dbr->fetchObject( $res ) ) {
 215                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 216                 }
 217                 return $titles;
 218         }
 219
 220         /**
 221          * Create a new Title from a namespace index and a DB key.
 222          * It's assumed that $ns and $title are *valid*, for instance when
 223          * they came directly from the database or a special page name.
 224          * For convenience, spaces are converted to underscores so that
 225          * eg user_text fields can be used directly.
 226          *
 227          * @param int $ns the namespace of the article
 228          * @param string $title the unprefixed database key form
 229          * @return Title the new object
 230          */
 231         public static function &makeTitle( $ns, $title ) {
 232                 $t = new Title();
 233                 $t->mInterwiki = '';
 234                 $t->mFragment = '';
 235                 $t->mNamespace = intval( $ns );
 236                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 237                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 238                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 239                 $t->mTextform = str_replace( '_', ' ', $title );
 240                 return $t;
 241         }
 242
 243         /**
 244          * Create a new Title from a namespace index and a DB key.
 245          * The parameters will be checked for validity, which is a bit slower
 246          * than makeTitle() but safer for user-provided data.
 247          *
 248          * @param int $ns the namespace of the article
 249          * @param string $title the database key form
 250          * @return Title the new object, or NULL on an error
 251          */
 252         public static function makeTitleSafe( $ns, $title ) {
 253                 $t = new Title();
 254                 $t->mDbkeyform = Title::makeName( $ns, $title );
 255                 if( $t->secureAndSplit() ) {
 256                         return $t;
 257                 } else {
 258                         return NULL;
 259                 }
 260         }
 261
 262         /**
 263          * Create a new Title for the Main Page
 264          * @return Title the new object
 265          */
 266         public static function newMainPage() {
 267                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 268         }
 269
 270         /**
 271          * Create a new Title for a redirect
 272          * @param string $text the redirect title text
 273          * @return Title the new object, or NULL if the text is not a
 274          *      valid redirect
 275          */
 276         public static function newFromRedirect( $text ) {
 277                 $mwRedir = MagicWord::get( 'redirect' );
 278                 $rt = NULL;
 279                 if ( $mwRedir->matchStart( $text ) ) {
 280                         $m = array();
 281                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 282                                 # categories are escaped using : for example one can enter:
 283                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 284                                 if ( substr($m[1],0,1) == ':') {
 285                                         # We don't want to keep the ':'
 286                                         $m[1] = substr( $m[1], 1 );
 287                                 }
 288
 289                                 $rt = Title::newFromText( $m[1] );
 290                                 # Disallow redirects to Special:Userlogout
 291                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 292                                         $rt = NULL;
 293                                 }
 294                         }
 295                 }
 296                 return $rt;
 297         }
 298
 299 #----------------------------------------------------------------------------
 300 #       Static functions
 301 #----------------------------------------------------------------------------
 302
 303         /**
 304          * Get the prefixed DB key associated with an ID
 305          * @param int $id the page_id of the article
 306          * @return Title an object representing the article, or NULL
 307          *      if no such article was found
 308          * @static
 309          * @access public
 310          */
 311         function nameOf( $id ) {
 312                 $fname = 'Title::nameOf';
 313                 $dbr = wfGetDB( DB_SLAVE );
 314
 315                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 316                 if ( $s === false ) { return NULL; }
 317
 318                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 319                 return $n;
 320         }
 321
 322         /**
 323          * Get a regex character class describing the legal characters in a link
 324          * @return string the list of characters, not delimited
 325          */
 326         public static function legalChars() {
 327                 global $wgLegalTitleChars;
 328                 return $wgLegalTitleChars;
 329         }
 330
 331         /**
 332          * Get a string representation of a title suitable for
 333          * including in a search index
 334          *
 335          * @param int $ns a namespace index
 336          * @param string $title text-form main part
 337          * @return string a stripped-down title string ready for the
 338          *      search index
 339          */
 340         public static function indexTitle( $ns, $title ) {
 341                 global $wgContLang;
 342
 343                 $lc = SearchEngine::legalSearchChars() . '&#;';
 344                 $t = $wgContLang->stripForSearch( $title );
 345                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 346                 $t = $wgContLang->lc( $t );
 347
 348                 # Handle 's, s'
 349                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 350                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 351
 352                 $t = preg_replace( "/\\s+/", ' ', $t );
 353
 354                 if ( $ns == NS_IMAGE ) {
 355                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 356                 }
 357                 return trim( $t );
 358         }
 359
 360         /*
 361          * Make a prefixed DB key from a DB key and a namespace index
 362          * @param int $ns numerical representation of the namespace
 363          * @param string $title the DB key form the title
 364          * @return string the prefixed form of the title
 365          */
 366         public static function makeName( $ns, $title ) {
 367                 global $wgContLang;
 368
 369                 $n = $wgContLang->getNsText( $ns );
 370                 return $n == '' ? $title : "$n:$title";
 371         }
 372
 373         /**
 374          * Returns the URL associated with an interwiki prefix
 375          * @param string $key the interwiki prefix (e.g. "MeatBall")
 376          * @return the associated URL, containing "$1", which should be
 377          *      replaced by an article title
 378          * @static (arguably)
 379          */
 380         public function getInterwikiLink( $key )  {
 381                 global $wgMemc, $wgInterwikiExpiry;
 382                 global $wgInterwikiCache, $wgContLang;
 383                 $fname = 'Title::getInterwikiLink';
 384
 385                 $key = $wgContLang->lc( $key );
 386
 387                 $k = wfMemcKey( 'interwiki', $key );
 388                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 389                         return Title::$interwikiCache[$k]->iw_url;
 390                 }
 391
 392                 if ($wgInterwikiCache) {
 393                         return Title::getInterwikiCached( $key );
 394                 }
 395
 396                 $s = $wgMemc->get( $k );
 397                 # Ignore old keys with no iw_local
 398                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 399                         Title::$interwikiCache[$k] = $s;
 400                         return $s->iw_url;
 401                 }
 402
 403                 $dbr = wfGetDB( DB_SLAVE );
 404                 $res = $dbr->select( 'interwiki',
 405                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 406                         array( 'iw_prefix' => $key ), $fname );
 407                 if( !$res ) {
 408                         return '';
 409                 }
 410
 411                 $s = $dbr->fetchObject( $res );
 412                 if( !$s ) {
 413                         # Cache non-existence: create a blank object and save it to memcached
 414                         $s = (object)false;
 415                         $s->iw_url = '';
 416                         $s->iw_local = 0;
 417                         $s->iw_trans = 0;
 418                 }
 419                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 420                 Title::$interwikiCache[$k] = $s;
 421
 422                 return $s->iw_url;
 423         }
 424
 425         /**
 426          * Fetch interwiki prefix data from local cache in constant database
 427          *
 428          * More logic is explained in DefaultSettings
 429          *
 430          * @return string URL of interwiki site
 431          */
 432         public static function getInterwikiCached( $key ) {
 433                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 434                 static $db, $site;
 435
 436                 if (!$db)
 437                         $db=dba_open($wgInterwikiCache,'r','cdb');
 438                 /* Resolve site name */
 439                 if ($wgInterwikiScopes>=3 and !$site) {
 440                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 441                         if ($site=="")
 442                                 $site = $wgInterwikiFallbackSite;
 443                 }
 444                 $value = dba_fetch( wfMemcKey( $key ), $db);
 445                 if ($value=='' and $wgInterwikiScopes>=3) {
 446                         /* try site-level */
 447                         $value = dba_fetch("_{$site}:{$key}", $db);
 448                 }
 449                 if ($value=='' and $wgInterwikiScopes>=2) {
 450                         /* try globals */
 451                         $value = dba_fetch("__global:{$key}", $db);
 452                 }
 453                 if ($value=='undef')
 454                         $value='';
 455                 $s = (object)false;
 456                 $s->iw_url = '';
 457                 $s->iw_local = 0;
 458                 $s->iw_trans = 0;
 459                 if ($value!='') {
 460                         list($local,$url)=explode(' ',$value,2);
 461                         $s->iw_url=$url;
 462                         $s->iw_local=(int)$local;
 463                 }
 464                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 465                 return $s->iw_url;
 466         }
 467         /**
 468          * Determine whether the object refers to a page within
 469          * this project.
 470          *
 471          * @return bool TRUE if this is an in-project interwiki link
 472          *      or a wikilink, FALSE otherwise
 473          */
 474         public function isLocal() {
 475                 if ( $this->mInterwiki != '' ) {
 476                         # Make sure key is loaded into cache
 477                         $this->getInterwikiLink( $this->mInterwiki );
 478                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 479                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 480                 } else {
 481                         return true;
 482                 }
 483         }
 484
 485         /**
 486          * Determine whether the object refers to a page within
 487          * this project and is transcludable.
 488          *
 489          * @return bool TRUE if this is transcludable
 490          */
 491         public function isTrans() {
 492                 if ($this->mInterwiki == '')
 493                         return false;
 494                 # Make sure key is loaded into cache
 495                 $this->getInterwikiLink( $this->mInterwiki );
 496                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 497                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 498         }
 499
 500         /**
 501          * Update the page_touched field for an array of title objects
 502          * @todo Inefficient unless the IDs are already loaded into the
 503          *      link cache
 504          * @param array $titles an array of Title objects to be touched
 505          * @param string $timestamp the timestamp to use instead of the
 506          *      default current time
 507          * @static
 508          * @access public
 509          */
 510         function touchArray( $titles, $timestamp = '' ) {
 511
 512                 if ( count( $titles ) == 0 ) {
 513                         return;
 514                 }
 515                 $dbw = wfGetDB( DB_MASTER );
 516                 if ( $timestamp == '' ) {
 517                         $timestamp = $dbw->timestamp();
 518                 }
 519                 /*
 520                 $page = $dbw->tableName( 'page' );
 521                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 522                 $first = true;
 523
 524                 foreach ( $titles as $title ) {
 525                         if ( $wgUseFileCache ) {
 526                                 $cm = new HTMLFileCache($title);
 527                                 @unlink($cm->fileCacheName());
 528                         }
 529
 530                         if ( ! $first ) {
 531                                 $sql .= ',';
 532                         }
 533                         $first = false;
 534                         $sql .= $title->getArticleID();
 535                 }
 536                 $sql .= ')';
 537                 if ( ! $first ) {
 538                         $dbw->query( $sql, 'Title::touchArray' );
 539                 }
 540                 */
 541                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 542                 // do them in small chunks:
 543                 $fname = 'Title::touchArray';
 544                 foreach( $titles as $title ) {
 545                         $dbw->update( 'page',
 546                                 array( 'page_touched' => $timestamp ),
 547                                 array(
 548                                         'page_namespace' => $title->getNamespace(),
 549                                         'page_title'     => $title->getDBkey() ),
 550                                 $fname );
 551                 }
 552         }
 553
 554         /**
 555          * Escape a text fragment, say from a link, for a URL
 556          */
 557         static function escapeFragmentForURL( $fragment ) {
 558                 $fragment = str_replace( ' ', '_', $fragment );
 559                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 560                 $replaceArray = array(
 561                         '%3A' => ':',
 562                         '%' => '.'
 563                 );
 564                 return strtr( $fragment, $replaceArray );
 565         }
 566
 567 #----------------------------------------------------------------------------
 568 #       Other stuff
 569 #----------------------------------------------------------------------------
 570
 571         /** Simple accessors */
 572         /**
 573          * Get the text form (spaces not underscores) of the main part
 574          * @return string
 575          */
 576         public function getText() { return $this->mTextform; }
 577         /**
 578          * Get the URL-encoded form of the main part
 579          * @return string
 580          */
 581         public function getPartialURL() { return $this->mUrlform; }
 582         /**
 583          * Get the main part with underscores
 584          * @return string
 585          */
 586         public function getDBkey() { return $this->mDbkeyform; }
 587         /**
 588          * Get the namespace index, i.e. one of the NS_xxxx constants
 589          * @return int
 590          */
 591         public function getNamespace() { return $this->mNamespace; }
 592         /**
 593          * Get the namespace text
 594          * @return string
 595          */
 596         public function getNsText() {
 597                 global $wgContLang, $wgCanonicalNamespaceNames;
 598
 599                 if ( '' != $this->mInterwiki ) {
 600                         // This probably shouldn't even happen. ohh man, oh yuck.
 601                         // But for interwiki transclusion it sometimes does.
 602                         // Shit. Shit shit shit.
 603                         //
 604                         // Use the canonical namespaces if possible to try to
 605                         // resolve a foreign namespace.
 606                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 607                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 608                         }
 609                 }
 610                 return $wgContLang->getNsText( $this->mNamespace );
 611         }
 612         /**
 613          * Get the namespace text of the subject (rather than talk) page
 614          * @return string
 615          */
 616         public function getSubjectNsText() {
 617                 global $wgContLang;
 618                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 619         }
 620
 621         /**
 622          * Get the namespace text of the talk page
 623          * @return string
 624          */
 625         public function getTalkNsText() {
 626                 global $wgContLang;
 627                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 628         }
 629
 630         /**
 631          * Could this title have a corresponding talk page?
 632          * @return bool
 633          */
 634         public function canTalk() {
 635                 return( Namespace::canTalk( $this->mNamespace ) );
 636         }
 637
 638         /**
 639          * Get the interwiki prefix (or null string)
 640          * @return string
 641          */
 642         public function getInterwiki() { return $this->mInterwiki; }
 643         /**
 644          * Get the Title fragment (i.e. the bit after the #) in text form
 645          * @return string
 646          */
 647         public function getFragment() { return $this->mFragment; }
 648         /**
 649          * Get the fragment in URL form, including the "#" character if there is one
 650          * @return string
 651          */
 652         public function getFragmentForURL() {
 653                 if ( $this->mFragment == '' ) {
 654                         return '';
 655                 } else {
 656                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 657                 }
 658         }
 659         /**
 660          * Get the default namespace index, for when there is no namespace
 661          * @return int
 662          */
 663         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 664
 665         /**
 666          * Get title for search index
 667          * @return string a stripped-down title string ready for the
 668          *      search index
 669          */
 670         public function getIndexTitle() {
 671                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 672         }
 673
 674         /**
 675          * Get the prefixed database key form
 676          * @return string the prefixed title, with underscores and
 677          *      any interwiki and namespace prefixes
 678          */
 679         public function getPrefixedDBkey() {
 680                 $s = $this->prefix( $this->mDbkeyform );
 681                 $s = str_replace( ' ', '_', $s );
 682                 return $s;
 683         }
 684
 685         /**
 686          * Get the prefixed title with spaces.
 687          * This is the form usually used for display
 688          * @return string the prefixed title, with spaces
 689          */
 690         public function getPrefixedText() {
 691                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 692                         $s = $this->prefix( $this->mTextform );
 693                         $s = str_replace( '_', ' ', $s );
 694                         $this->mPrefixedText = $s;
 695                 }
 696                 return $this->mPrefixedText;
 697         }
 698
 699         /**
 700          * Get the prefixed title with spaces, plus any fragment
 701          * (part beginning with '#')
 702          * @return string the prefixed title, with spaces and
 703          *      the fragment, including '#'
 704          */
 705         public function getFullText() {
 706                 $text = $this->getPrefixedText();
 707                 if( '' != $this->mFragment ) {
 708                         $text .= '#' . $this->mFragment;
 709                 }
 710                 return $text;
 711         }
 712
 713         /**
 714          * Get the base name, i.e. the leftmost parts before the /
 715          * @return string Base name
 716          */
 717         public function getBaseText() {
 718                 global $wgNamespacesWithSubpages;
 719                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 720                         $parts = explode( '/', $this->getText() );
 721                         # Don't discard the real title if there's no subpage involved
 722                         if( count( $parts ) > 1 )
 723                                 unset( $parts[ count( $parts ) - 1 ] );
 724                         return implode( '/', $parts );
 725                 } else {
 726                         return $this->getText();
 727                 }
 728         }
 729
 730         /**
 731          * Get the lowest-level subpage name, i.e. the rightmost part after /
 732          * @return string Subpage name
 733          */
 734         public function getSubpageText() {
 735                 global $wgNamespacesWithSubpages;
 736                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 737                         $parts = explode( '/', $this->mTextform );
 738                         return( $parts[ count( $parts ) - 1 ] );
 739                 } else {
 740                         return( $this->mTextform );
 741                 }
 742         }
 743
 744         /**
 745          * Get a URL-encoded form of the subpage text
 746          * @return string URL-encoded subpage name
 747          */
 748         public function getSubpageUrlForm() {
 749                 $text = $this->getSubpageText();
 750                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 751                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 752                 return( $text );
 753         }
 754
 755         /**
 756          * Get a URL-encoded title (not an actual URL) including interwiki
 757          * @return string the URL-encoded form
 758          */
 759         public function getPrefixedURL() {
 760                 $s = $this->prefix( $this->mDbkeyform );
 761                 $s = str_replace( ' ', '_', $s );
 762
 763                 $s = wfUrlencode ( $s ) ;
 764
 765                 # Cleaning up URL to make it look nice -- is this safe?
 766                 $s = str_replace( '%28', '(', $s );
 767                 $s = str_replace( '%29', ')', $s );
 768
 769                 return $s;
 770         }
 771
 772         /**
 773          * Get a real URL referring to this title, with interwiki link and
 774          * fragment
 775          *
 776          * @param string $query an optional query string, not used
 777          *      for interwiki links
 778          * @param string $variant language variant of url (for sr, zh..)
 779          * @return string the URL
 780          */
 781         public function getFullURL( $query = '', $variant = false ) {
 782                 global $wgContLang, $wgServer, $wgRequest;
 783
 784                 if ( '' == $this->mInterwiki ) {
 785                         $url = $this->getLocalUrl( $query, $variant );
 786
 787                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 788                         // Correct fix would be to move the prepending elsewhere.
 789                         if ($wgRequest->getVal('action') != 'render') {
 790                                 $url = $wgServer . $url;
 791                         }
 792                 } else {
 793                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 794
 795                         $namespace = wfUrlencode( $this->getNsText() );
 796                         if ( '' != $namespace ) {
 797                                 # Can this actually happen? Interwikis shouldn't be parsed.
 798                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 799                                 $namespace .= ':';
 800                         }
 801                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 802                         $url = wfAppendQuery( $url, $query );
 803                 }
 804
 805                 # Finally, add the fragment.
 806                 $url .= $this->getFragmentForURL();
 807
 808                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 809                 return $url;
 810         }
 811
 812         /**
 813          * Get a URL with no fragment or server name.  If this page is generated
 814          * with action=render, $wgServer is prepended.
 815          * @param string $query an optional query string; if not specified,
 816          *      $wgArticlePath will be used.
 817          * @param string $variant language variant of url (for sr, zh..)
 818          * @return string the URL
 819          */
 820         public function getLocalURL( $query = '', $variant = false ) {
 821                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 822                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 823
 824                 // internal links should point to same variant as current page (only anonymous users)
 825                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 826                         $pref = $wgContLang->getPreferredVariant(false);
 827                         if($pref != $wgContLang->getCode())
 828                                 $variant = $pref;
 829                 }
 830
 831                 if ( $this->isExternal() ) {
 832                         $url = $this->getFullURL();
 833                         if ( $query ) {
 834                                 // This is currently only used for edit section links in the
 835                                 // context of interwiki transclusion. In theory we should
 836                                 // append the query to the end of any existing query string,
 837                                 // but interwiki transclusion is already broken in that case.
 838                                 $url .= "?$query";
 839                         }
 840                 } else {
 841                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 842                         if ( $query == '' ) {
 843                                 if($variant!=false && $wgContLang->hasVariants()){
 844                                         if($wgVariantArticlePath==false) {
 845                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 846                                         } else {
 847                                                 $variantArticlePath = $wgVariantArticlePath;
 848                                         }
 849                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 850                                         $url = str_replace( '$1', $dbkey, $url  );
 851                                 }
 852                                 else {
 853                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 854                                 }
 855                         } else {
 856                                 global $wgActionPaths;
 857                                 $url = false;
 858                                 $matches = array();
 859                                 if( !empty( $wgActionPaths ) &&
 860                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 861                                 {
 862                                         $action = urldecode( $matches[2] );
 863                                         if( isset( $wgActionPaths[$action] ) ) {
 864                                                 $query = $matches[1];
 865                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 866                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 867                                                 if( $query != '' ) $url .= '?' . $query;
 868                                         }
 869                                 }
 870                                 if ( $url === false ) {
 871                                         if ( $query == '-' ) {
 872                                                 $query = '';
 873                                         }
 874                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 875                                 }
 876                         }
 877
 878                         // FIXME: this causes breakage in various places when we
 879                         // actually expected a local URL and end up with dupe prefixes.
 880                         if ($wgRequest->getVal('action') == 'render') {
 881                                 $url = $wgServer . $url;
 882                         }
 883                 }
 884                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 885                 return $url;
 886         }
 887
 888         /**
 889          * Get an HTML-escaped version of the URL form, suitable for
 890          * using in a link, without a server name or fragment
 891          * @param string $query an optional query string
 892          * @return string the URL
 893          */
 894         public function escapeLocalURL( $query = '' ) {
 895                 return htmlspecialchars( $this->getLocalURL( $query ) );
 896         }
 897
 898         /**
 899          * Get an HTML-escaped version of the URL form, suitable for
 900          * using in a link, including the server name and fragment
 901          *
 902          * @return string the URL
 903          * @param string $query an optional query string
 904          */
 905         public function escapeFullURL( $query = '' ) {
 906                 return htmlspecialchars( $this->getFullURL( $query ) );
 907         }
 908
 909         /**
 910          * Get the URL form for an internal link.
 911          * - Used in various Squid-related code, in case we have a different
 912          * internal hostname for the server from the exposed one.
 913          *
 914          * @param string $query an optional query string
 915          * @param string $variant language variant of url (for sr, zh..)
 916          * @return string the URL
 917          */
 918         public function getInternalURL( $query = '', $variant = false ) {
 919                 global $wgInternalServer;
 920                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 921                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 922                 return $url;
 923         }
 924
 925         /**
 926          * Get the edit URL for this Title
 927          * @return string the URL, or a null string if this is an
 928          *      interwiki link
 929          */
 930         public function getEditURL() {
 931                 if ( '' != $this->mInterwiki ) { return ''; }
 932                 $s = $this->getLocalURL( 'action=edit' );
 933
 934                 return $s;
 935         }
 936
 937         /**
 938          * Get the HTML-escaped displayable text form.
 939          * Used for the title field in <a> tags.
 940          * @return string the text, including any prefixes
 941          */
 942         public function getEscapedText() {
 943                 return htmlspecialchars( $this->getPrefixedText() );
 944         }
 945
 946         /**
 947          * Is this Title interwiki?
 948          * @return boolean
 949          */
 950         public function isExternal() { return ( '' != $this->mInterwiki ); }
 951
 952         /**
 953          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 954          *
 955          * @param string Action to check (default: edit)
 956          * @return bool
 957          */
 958         public function isSemiProtected( $action = 'edit' ) {
 959                 if( $this->exists() ) {
 960                         $restrictions = $this->getRestrictions( $action );
 961                         if( count( $restrictions ) > 0 ) {
 962                                 foreach( $restrictions as $restriction ) {
 963                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 964                                                 return false;
 965                                 }
 966                         } else {
 967                                 # Not protected
 968                                 return false;
 969                         }
 970                         return true;
 971                 } else {
 972                         # If it doesn't exist, it can't be protected
 973                         return false;
 974                 }
 975         }
 976
 977         /**
 978          * Does the title correspond to a protected article?
 979          * @param string $what the action the page is protected from,
 980          *      by default checks move and edit
 981          * @return boolean
 982          */
 983         public function isProtected( $action = '' ) {
 984                 global $wgRestrictionLevels;
 985
 986                 # Special pages have inherent protection
 987                 if( $this->getNamespace() == NS_SPECIAL )
 988                         return true;
 989
 990                 # Check regular protection levels
 991                 if( $action == 'edit' || $action == '' ) {
 992                         $r = $this->getRestrictions( 'edit' );
 993                         foreach( $wgRestrictionLevels as $level ) {
 994                                 if( in_array( $level, $r ) && $level != '' ) {
 995                                         return( true );
 996                                 }
 997                         }
 998                 }
 999
1000                 if( $action == 'move' || $action == '' ) {
1001                         $r = $this->getRestrictions( 'move' );
1002                         foreach( $wgRestrictionLevels as $level ) {
1003                                 if( in_array( $level, $r ) && $level != '' ) {
1004                                         return( true );
1005                                 }
1006                         }
1007                 }
1008
1009                 return false;
1010         }
1011
1012         /**
1013          * Is $wgUser is watching this page?
1014          * @return boolean
1015          */
1016         public function userIsWatching() {
1017                 global $wgUser;
1018
1019                 if ( is_null( $this->mWatched ) ) {
1020                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1021                                 $this->mWatched = false;
1022                         } else {
1023                                 $this->mWatched = $wgUser->isWatched( $this );
1024                         }
1025                 }
1026                 return $this->mWatched;
1027         }
1028
1029         /**
1030          * Can $wgUser perform $action on this page?
1031          * This skips potentially expensive cascading permission checks.
1032          *
1033          * Suitable for use for nonessential UI controls in common cases, but
1034          * _not_ for functional access control.
1035          *
1036          * May provide false positives, but should never provide a false negative.
1037          *
1038          * @param string $action action that permission needs to be checked for
1039          * @return boolean
1040          */
1041         public function quickUserCan( $action ) {
1042                 return $this->userCan( $action, false );
1043         }
1044
1045         /**
1046          * Can $wgUser perform $action on this page?
1047          * @param string $action action that permission needs to be checked for
1048          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1049          * @return boolean
1050          */
1051         public function userCan( $action, $doExpensiveQueries = true ) {
1052                 $fname = 'Title::userCan';
1053                 wfProfileIn( $fname );
1054
1055                 global $wgUser, $wgNamespaceProtection;
1056
1057                 $result = null;
1058                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1059                 if ( $result !== null ) {
1060                         wfProfileOut( $fname );
1061                         return $result;
1062                 }
1063
1064                 if( NS_SPECIAL == $this->mNamespace ) {
1065                         wfProfileOut( $fname );
1066                         return false;
1067                 }
1068
1069                 if ( array_key_exists( $this->mNamespace, $wgNamespaceProtection ) ) {
1070                         $nsProt = $wgNamespaceProtection[ $this->mNamespace ];
1071                         if ( !is_array($nsProt) ) $nsProt = array($nsProt);
1072                         foreach( $nsProt as $right ) {
1073                                 if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1074                                         wfProfileOut( $fname );
1075                                         return false;
1076                                 }
1077                         }
1078                 }
1079
1080                 if( $this->mDbkeyform == '_' ) {
1081                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1082                         wfProfileOut( $fname );
1083                         return false;
1084                 }
1085
1086                 # protect css/js subpages of user pages
1087                 # XXX: this might be better using restrictions
1088                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1089                 if( $this->isCssJsSubpage()
1090                         && !$wgUser->isAllowed('editinterface')
1091                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1092                         wfProfileOut( $fname );
1093                         return false;
1094                 }
1095
1096                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1097                         # We /could/ use the protection level on the source page, but it's fairly ugly
1098                         #  as we have to establish a precedence hierarchy for pages included by multiple
1099                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1100                         #  as they could remove the protection anyway.
1101                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1102                         # Cascading protection depends on more than this page...
1103                         # Several cascading protected pages may include this page...
1104                         # Check each cascading level
1105                         # This is only for protection restrictions, not for all actions
1106                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1107                                 foreach( $restrictions[$action] as $right ) {
1108                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1109                                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1110                                                 wfProfileOut( $fname );
1111                                                 return false;
1112                                         }
1113                                 }
1114                         }
1115                 }
1116
1117                 foreach( $this->getRestrictions($action) as $right ) {
1118                         // Backwards compatibility, rewrite sysop -> protect
1119                         if ( $right == 'sysop' ) {
1120                                 $right = 'protect';
1121                         }
1122                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1123                                 wfProfileOut( $fname );
1124                                 return false;
1125                         }
1126                 }
1127
1128                 if( $action == 'move' &&
1129                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1130                         wfProfileOut( $fname );
1131                         return false;
1132                 }
1133
1134                 if( $action == 'create' ) {
1135                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1136                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1137                                 wfProfileOut( $fname );
1138                                 return false;
1139                         }
1140                 }
1141
1142                 wfProfileOut( $fname );
1143                 return true;
1144         }
1145
1146         /**
1147          * Can $wgUser edit this page?
1148          * @return boolean
1149          * @deprecated use userCan('edit')
1150          */
1151         public function userCanEdit( $doExpensiveQueries = true ) {
1152                 return $this->userCan( 'edit', $doExpensiveQueries );
1153         }
1154
1155         /**
1156          * Can $wgUser create this page?
1157          * @return boolean
1158          * @deprecated use userCan('create')
1159          */
1160         public function userCanCreate( $doExpensiveQueries = true ) {
1161                 return $this->userCan( 'create', $doExpensiveQueries );
1162         }
1163
1164         /**
1165          * Can $wgUser move this page?
1166          * @return boolean
1167          * @deprecated use userCan('move')
1168          */
1169         public function userCanMove( $doExpensiveQueries = true ) {
1170                 return $this->userCan( 'move', $doExpensiveQueries );
1171         }
1172
1173         /**
1174          * Would anybody with sufficient privileges be able to move this page?
1175          * Some pages just aren't movable.
1176          *
1177          * @return boolean
1178          */
1179         public function isMovable() {
1180                 return Namespace::isMovable( $this->getNamespace() )
1181                         && $this->getInterwiki() == '';
1182         }
1183
1184         /**
1185          * Can $wgUser read this page?
1186          * @return boolean
1187          * @todo fold these checks into userCan()
1188          */
1189         public function userCanRead() {
1190                 global $wgUser;
1191
1192                 $result = null;
1193                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1194                 if ( $result !== null ) {
1195                         return $result;
1196                 }
1197
1198                 if( $wgUser->isAllowed('read') ) {
1199                         return true;
1200                 } else {
1201                         global $wgWhitelistRead;
1202
1203                         /**
1204                          * Always grant access to the login page.
1205                          * Even anons need to be able to log in.
1206                         */
1207                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1208                                 return true;
1209                         }
1210
1211                         /** some pages are explicitly allowed */
1212                         $name = $this->getPrefixedText();
1213                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1214                                 return true;
1215                         }
1216
1217                         # Compatibility with old settings
1218                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1219                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1220                                         return true;
1221                                 }
1222                         }
1223                 }
1224                 return false;
1225         }
1226
1227         /**
1228          * Is this a talk page of some sort?
1229          * @return bool
1230          */
1231         public function isTalkPage() {
1232                 return Namespace::isTalk( $this->getNamespace() );
1233         }
1234
1235         /**
1236          * Is this a subpage?
1237          * @return bool
1238          */
1239         public function isSubpage() {
1240                 global $wgNamespacesWithSubpages;
1241
1242                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1243                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1244                 } else {
1245                         return false;
1246                 }
1247         }
1248
1249         /**
1250          * Is this a .css or .js subpage of a user page?
1251          * @return bool
1252          */
1253         public function isCssJsSubpage() {
1254                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1255         }
1256         /**
1257          * Is this a *valid* .css or .js subpage of a user page?
1258          * Check that the corresponding skin exists
1259          */
1260         public function isValidCssJsSubpage() {
1261                 if ( $this->isCssJsSubpage() ) {
1262                         $skinNames = Skin::getSkinNames();
1263                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1264                 } else {
1265                         return false;
1266                 }
1267         }
1268         /**
1269          * Trim down a .css or .js subpage title to get the corresponding skin name
1270          */
1271         public function getSkinFromCssJsSubpage() {
1272                 $subpage = explode( '/', $this->mTextform );
1273                 $subpage = $subpage[ count( $subpage ) - 1 ];
1274                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1275         }
1276         /**
1277          * Is this a .css subpage of a user page?
1278          * @return bool
1279          */
1280         public function isCssSubpage() {
1281                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1282         }
1283         /**
1284          * Is this a .js subpage of a user page?
1285          * @return bool
1286          */
1287         public function isJsSubpage() {
1288                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1289         }
1290         /**
1291          * Protect css/js subpages of user pages: can $wgUser edit
1292          * this page?
1293          *
1294          * @return boolean
1295          * @todo XXX: this might be better using restrictions
1296          */
1297         public function userCanEditCssJsSubpage() {
1298                 global $wgUser;
1299                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1300         }
1301
1302         /**
1303          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1304          *
1305          * @return bool If the page is subject to cascading restrictions.
1306          */
1307         public function isCascadeProtected() {
1308                 list( $sources, $restrictions ) = $this->getCascadeProtectionSources( false );
1309                 return ( $sources > 0 );
1310         }
1311
1312         /**
1313          * Cascading protection: Get the source of any cascading restrictions on this page.
1314          *
1315          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1316          * @return array( mixed title array, restriction array)
1317          * 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.
1318          * The restriction array is an array of each type, each of which contains an array of unique groups
1319          */
1320         public function getCascadeProtectionSources( $get_pages = true ) {
1321                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1322
1323                 # Define our dimension of restrictions types
1324                 $pagerestrictions = array();
1325                 foreach( $wgRestrictionTypes as $action )
1326                         $pagerestrictions[$action] = array();
1327
1328                 if (!$wgEnableCascadingProtection)
1329                         return array( false, $pagerestrictions );
1330
1331                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1332                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1333                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1334                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1335                 }
1336
1337                 wfProfileIn( __METHOD__ );
1338
1339                 $dbr = wfGetDb( DB_SLAVE );
1340
1341                 if ( $this->getNamespace() == NS_IMAGE ) {
1342                         $tables = array ('imagelinks', 'page_restrictions');
1343                         $where_clauses = array(
1344                                 'il_to' => $this->getDBkey(),
1345                                 'il_from=pr_page',
1346                                 'pr_cascade' => 1 );
1347                 } else {
1348                         $tables = array ('templatelinks', 'page_restrictions');
1349                         $where_clauses = array(
1350                                 'tl_namespace' => $this->getNamespace(),
1351                                 'tl_title' => $this->getDBkey(),
1352                                 'tl_from=pr_page',
1353                                 'pr_cascade' => 1 );
1354                 }
1355
1356                 if ( $get_pages ) {
1357                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1358                         $where_clauses[] = 'page_id=pr_page';
1359                         $tables[] = 'page';
1360                 } else {
1361                         $cols = array( 'pr_expiry' );
1362                 }
1363
1364                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1365
1366                 $sources = $get_pages ? array() : false;
1367                 $now = wfTimestampNow();
1368                 $purgeExpired = false;
1369
1370                 while( $row = $dbr->fetchObject( $res ) ) {
1371                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1372                         if( $expiry > $now ) {
1373                                 if ($get_pages) {
1374                                         $page_id = $row->pr_page;
1375                                         $page_ns = $row->page_namespace;
1376                                         $page_title = $row->page_title;
1377                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1378                                         # Add groups needed for each restriction type if its not already there
1379                                         # Make sure this restriction type still exists
1380                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1381                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1382                                         }
1383                                 } else {
1384                                         $sources = true;
1385                                 }
1386                         } else {
1387                                 // Trigger lazy purge of expired restrictions from the db
1388                                 $purgeExpired = true;
1389                         }
1390                 }
1391                 if( $purgeExpired ) {
1392                         Title::purgeExpiredRestrictions();
1393                 }
1394
1395                 wfProfileOut( __METHOD__ );
1396
1397                 if ( $get_pages ) {
1398                         $this->mCascadeSources = $sources;
1399                         $this->mCascadingRestrictions = $pagerestrictions;
1400                 } else {
1401                         $this->mHasCascadingRestrictions = $sources;
1402                 }
1403
1404                 return array( $sources, $pagerestrictions );
1405         }
1406
1407         function areRestrictionsCascading() {
1408                 if (!$this->mRestrictionsLoaded) {
1409                         $this->loadRestrictions();
1410                 }
1411
1412                 return $this->mCascadeRestriction;
1413         }
1414
1415         /**
1416          * Loads a string into mRestrictions array
1417          * @param resource $res restrictions as an SQL result.
1418          */
1419         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1420                 $dbr = wfGetDb( DB_SLAVE );
1421
1422                 $this->mRestrictions['edit'] = array();
1423                 $this->mRestrictions['move'] = array();
1424
1425                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1426
1427                 if ( $oldFashionedRestrictions == NULL ) {
1428                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1429                 }
1430
1431                 if ($oldFashionedRestrictions != '') {
1432
1433                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1434                                 $temp = explode( '=', trim( $restrict ) );
1435                                 if(count($temp) == 1) {
1436                                         // old old format should be treated as edit/move restriction
1437                                         $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1438                                         $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1439                                 } else {
1440                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1441                                 }
1442                         }
1443
1444                         $this->mOldRestrictions = true;
1445                         $this->mCascadeRestriction = false;
1446                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1447
1448                 }
1449
1450                 if( $dbr->numRows( $res ) ) {
1451                         # Current system - load second to make them override.
1452                         $now = wfTimestampNow();
1453                         $purgeExpired = false;
1454
1455                         while ($row = $dbr->fetchObject( $res ) ) {
1456                                 # Cycle through all the restrictions.
1457
1458                                 // This code should be refactored, now that it's being used more generally,
1459                                 // But I don't really see any harm in leaving it in Block for now -werdna
1460                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1461
1462                                 // Only apply the restrictions if they haven't expired!
1463                                 if ( !$expiry || $expiry > $now ) {
1464                                         $this->mRestrictionsExpiry = $expiry;
1465                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1466
1467                                         $this->mCascadeRestriction |= $row->pr_cascade;
1468                                 } else {
1469                                         // Trigger a lazy purge of expired restrictions
1470                                         $purgeExpired = true;
1471                                 }
1472                         }
1473
1474                         if( $purgeExpired ) {
1475                                 Title::purgeExpiredRestrictions();
1476                         }
1477                 }
1478
1479                 $this->mRestrictionsLoaded = true;
1480         }
1481
1482         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1483                 if( !$this->mRestrictionsLoaded ) {
1484                         $dbr = wfGetDB( DB_SLAVE );
1485
1486                         $res = $dbr->select( 'page_restrictions', '*',
1487                                 array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1488
1489                         $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1490                 }
1491         }
1492
1493         /**
1494          * Purge expired restrictions from the page_restrictions table
1495          */
1496         static function purgeExpiredRestrictions() {
1497                 $dbw = wfGetDB( DB_MASTER );
1498                 $dbw->delete( 'page_restrictions',
1499                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1500                         __METHOD__ );
1501         }
1502
1503         /**
1504          * Accessor/initialisation for mRestrictions
1505          *
1506          * @param string $action action that permission needs to be checked for
1507          * @return array the array of groups allowed to edit this article
1508          */
1509         public function getRestrictions( $action ) {
1510                 if( $this->exists() ) {
1511                         if( !$this->mRestrictionsLoaded ) {
1512                                 $this->loadRestrictions();
1513                         }
1514                         return isset( $this->mRestrictions[$action] )
1515                                         ? $this->mRestrictions[$action]
1516                                         : array();
1517                 } else {
1518                         return array();
1519                 }
1520         }
1521
1522         /**
1523          * Is there a version of this page in the deletion archive?
1524          * @return int the number of archived revisions
1525          */
1526         public function isDeleted() {
1527                 $fname = 'Title::isDeleted';
1528                 if ( $this->getNamespace() < 0 ) {
1529                         $n = 0;
1530                 } else {
1531                         $dbr = wfGetDB( DB_SLAVE );
1532                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1533                                 'ar_title' => $this->getDBkey() ), $fname );
1534                         if( $this->getNamespace() == NS_IMAGE ) {
1535                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1536                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1537                         }
1538                 }
1539                 return (int)$n;
1540         }
1541
1542         /**
1543          * Get the article ID for this Title from the link cache,
1544          * adding it if necessary
1545          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1546          *      for update
1547          * @return int the ID
1548          */
1549         public function getArticleID( $flags = 0 ) {
1550                 $linkCache =& LinkCache::singleton();
1551                 if ( $flags & GAID_FOR_UPDATE ) {
1552                         $oldUpdate = $linkCache->forUpdate( true );
1553                         $this->mArticleID = $linkCache->addLinkObj( $this );
1554                         $linkCache->forUpdate( $oldUpdate );
1555                 } else {
1556                         if ( -1 == $this->mArticleID ) {
1557                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1558                         }
1559                 }
1560                 return $this->mArticleID;
1561         }
1562
1563         public function getLatestRevID() {
1564                 if ($this->mLatestID !== false)
1565                         return $this->mLatestID;
1566
1567                 $db = wfGetDB(DB_SLAVE);
1568                 return $this->mLatestID = $db->selectField( 'revision',
1569                         "max(rev_id)",
1570                         array('rev_page' => $this->getArticleID()),
1571                         'Title::getLatestRevID' );
1572         }
1573
1574         /**
1575          * This clears some fields in this object, and clears any associated
1576          * keys in the "bad links" section of the link cache.
1577          *
1578          * - This is called from Article::insertNewArticle() to allow
1579          * loading of the new page_id. It's also called from
1580          * Article::doDeleteArticle()
1581          *
1582          * @param int $newid the new Article ID
1583          */
1584         public function resetArticleID( $newid ) {
1585                 $linkCache =& LinkCache::singleton();
1586                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1587
1588                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1589                 else { $this->mArticleID = $newid; }
1590                 $this->mRestrictionsLoaded = false;
1591                 $this->mRestrictions = array();
1592         }
1593
1594         /**
1595          * Updates page_touched for this page; called from LinksUpdate.php
1596          * @return bool true if the update succeded
1597          */
1598         public function invalidateCache() {
1599                 global $wgUseFileCache;
1600
1601                 if ( wfReadOnly() ) {
1602                         return;
1603                 }
1604
1605                 $dbw = wfGetDB( DB_MASTER );
1606                 $success = $dbw->update( 'page',
1607                         array( /* SET */
1608                                 'page_touched' => $dbw->timestamp()
1609                         ), array( /* WHERE */
1610                                 'page_namespace' => $this->getNamespace() ,
1611                                 'page_title' => $this->getDBkey()
1612                         ), 'Title::invalidateCache'
1613                 );
1614
1615                 if ($wgUseFileCache) {
1616                         $cache = new HTMLFileCache($this);
1617                         @unlink($cache->fileCacheName());
1618                 }
1619
1620                 return $success;
1621         }
1622
1623         /**
1624          * Prefix some arbitrary text with the namespace or interwiki prefix
1625          * of this object
1626          *
1627          * @param string $name the text
1628          * @return string the prefixed text
1629          * @private
1630          */
1631         /* private */ function prefix( $name ) {
1632                 $p = '';
1633                 if ( '' != $this->mInterwiki ) {
1634                         $p = $this->mInterwiki . ':';
1635                 }
1636                 if ( 0 != $this->mNamespace ) {
1637                         $p .= $this->getNsText() . ':';
1638                 }
1639                 return $p . $name;
1640         }
1641
1642         /**
1643          * Secure and split - main initialisation function for this object
1644          *
1645          * Assumes that mDbkeyform has been set, and is urldecoded
1646          * and uses underscores, but not otherwise munged.  This function
1647          * removes illegal characters, splits off the interwiki and
1648          * namespace prefixes, sets the other forms, and canonicalizes
1649          * everything.
1650          * @return bool true on success
1651          */
1652         private function secureAndSplit() {
1653                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1654
1655                 # Initialisation
1656                 static $rxTc = false;
1657                 if( !$rxTc ) {
1658                         # % is needed as well
1659                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1660                 }
1661
1662                 $this->mInterwiki = $this->mFragment = '';
1663                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1664
1665                 $dbkey = $this->mDbkeyform;
1666
1667                 # Strip Unicode bidi override characters.
1668                 # Sometimes they slip into cut-n-pasted page titles, where the
1669                 # override chars get included in list displays.
1670                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1671                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1672
1673                 # Clean up whitespace
1674                 #
1675                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1676                 $dbkey = trim( $dbkey, '_' );
1677
1678                 if ( '' == $dbkey ) {
1679                         return false;
1680                 }
1681
1682                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1683                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1684                         return false;
1685                 }
1686
1687                 $this->mDbkeyform = $dbkey;
1688
1689                 # Initial colon indicates main namespace rather than specified default
1690                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1691                 if ( ':' == $dbkey{0} ) {
1692                         $this->mNamespace = NS_MAIN;
1693                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1694                 }
1695
1696                 # Namespace or interwiki prefix
1697                 $firstPass = true;
1698                 do {
1699                         $m = array();
1700                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1701                                 $p = $m[1];
1702                                 $lowerNs = $wgContLang->lc( $p );
1703                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1704                                         # Canonical namespace
1705                                         $dbkey = $m[2];
1706                                         $this->mNamespace = $ns;
1707                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1708                                         # Ordinary namespace
1709                                         $dbkey = $m[2];
1710                                         $this->mNamespace = $ns;
1711                                 } elseif( $this->getInterwikiLink( $p ) ) {
1712                                         if( !$firstPass ) {
1713                                                 # Can't make a local interwiki link to an interwiki link.
1714                                                 # That's just crazy!
1715                                                 return false;
1716                                         }
1717
1718                                         # Interwiki link
1719                                         $dbkey = $m[2];
1720                                         $this->mInterwiki = $wgContLang->lc( $p );
1721
1722                                         # Redundant interwiki prefix to the local wiki
1723                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1724                                                 if( $dbkey == '' ) {
1725                                                         # Can't have an empty self-link
1726                                                         return false;
1727                                                 }
1728                                                 $this->mInterwiki = '';
1729                                                 $firstPass = false;
1730                                                 # Do another namespace split...
1731                                                 continue;
1732                                         }
1733
1734                                         # If there's an initial colon after the interwiki, that also
1735                                         # resets the default namespace
1736                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1737                                                 $this->mNamespace = NS_MAIN;
1738                                                 $dbkey = substr( $dbkey, 1 );
1739                                         }
1740                                 }
1741                                 # If there's no recognized interwiki or namespace,
1742                                 # then let the colon expression be part of the title.
1743                         }
1744                         break;
1745                 } while( true );
1746
1747                 # We already know that some pages won't be in the database!
1748                 #
1749                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1750                         $this->mArticleID = 0;
1751                 }
1752                 $fragment = strstr( $dbkey, '#' );
1753                 if ( false !== $fragment ) {
1754                         $this->setFragment( $fragment );
1755                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1756                         # remove whitespace again: prevents "Foo_bar_#"
1757                         # becoming "Foo_bar_"
1758                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1759                 }
1760
1761                 # Reject illegal characters.
1762                 #
1763                 if( preg_match( $rxTc, $dbkey ) ) {
1764                         return false;
1765                 }
1766
1767                 /**
1768                  * Pages with "/./" or "/../" appearing in the URLs will
1769                  * often be unreachable due to the way web browsers deal
1770                  * with 'relative' URLs. Forbid them explicitly.
1771                  */
1772                 if ( strpos( $dbkey, '.' ) !== false &&
1773                      ( $dbkey === '.' || $dbkey === '..' ||
1774                        strpos( $dbkey, './' ) === 0  ||
1775                        strpos( $dbkey, '../' ) === 0 ||
1776                        strpos( $dbkey, '/./' ) !== false ||
1777                        strpos( $dbkey, '/../' ) !== false ) )
1778                 {
1779                         return false;
1780                 }
1781
1782                 /**
1783                  * Magic tilde sequences? Nu-uh!
1784                  */
1785                 if( strpos( $dbkey, '~~~' ) !== false ) {
1786                         return false;
1787                 }
1788
1789                 /**
1790                  * Limit the size of titles to 255 bytes.
1791                  * This is typically the size of the underlying database field.
1792                  * We make an exception for special pages, which don't need to be stored
1793                  * in the database, and may edge over 255 bytes due to subpage syntax
1794                  * for long titles, e.g. [[Special:Block/Long name]]
1795                  */
1796                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1797                   strlen( $dbkey ) > 512 )
1798                 {
1799                         return false;
1800                 }
1801
1802                 /**
1803                  * Normally, all wiki links are forced to have
1804                  * an initial capital letter so [[foo]] and [[Foo]]
1805                  * point to the same place.
1806                  *
1807                  * Don't force it for interwikis, since the other
1808                  * site might be case-sensitive.
1809                  */
1810                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1811                         $dbkey = $wgContLang->ucfirst( $dbkey );
1812                 }
1813
1814                 /**
1815                  * Can't make a link to a namespace alone...
1816                  * "empty" local links can only be self-links
1817                  * with a fragment identifier.
1818                  */
1819                 if( $dbkey == '' &&
1820                         $this->mInterwiki == '' &&
1821                         $this->mNamespace != NS_MAIN ) {
1822                         return false;
1823                 }
1824
1825                 // Any remaining initial :s are illegal.
1826                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1827                         return false;
1828                 }
1829
1830                 # Fill fields
1831                 $this->mDbkeyform = $dbkey;
1832                 $this->mUrlform = wfUrlencode( $dbkey );
1833
1834                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1835
1836                 return true;
1837         }
1838
1839         /**
1840          * Set the fragment for this title
1841          * This is kind of bad, since except for this rarely-used function, Title objects
1842          * are immutable. The reason this is here is because it's better than setting the
1843          * members directly, which is what Linker::formatComment was doing previously.
1844          *
1845          * @param string $fragment text
1846          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
1847          */
1848         public function setFragment( $fragment ) {
1849                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1850         }
1851
1852         /**
1853          * Get a Title object associated with the talk page of this article
1854          * @return Title the object for the talk page
1855          */
1856         public function getTalkPage() {
1857                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1858         }
1859
1860         /**
1861          * Get a title object associated with the subject page of this
1862          * talk page
1863          *
1864          * @return Title the object for the subject page
1865          */
1866         public function getSubjectPage() {
1867                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1868         }
1869
1870         /**
1871          * Get an array of Title objects linking to this Title
1872          * Also stores the IDs in the link cache.
1873          *
1874          * WARNING: do not use this function on arbitrary user-supplied titles!
1875          * On heavily-used templates it will max out the memory.
1876          *
1877          * @param string $options may be FOR UPDATE
1878          * @return array the Title objects linking here
1879          */
1880         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1881                 $linkCache =& LinkCache::singleton();
1882
1883                 if ( $options ) {
1884                         $db = wfGetDB( DB_MASTER );
1885                 } else {
1886                         $db = wfGetDB( DB_SLAVE );
1887                 }
1888
1889                 $res = $db->select( array( 'page', $table ),
1890                         array( 'page_namespace', 'page_title', 'page_id' ),
1891                         array(
1892                                 "{$prefix}_from=page_id",
1893                                 "{$prefix}_namespace" => $this->getNamespace(),
1894                                 "{$prefix}_title"     => $this->getDbKey() ),
1895                         'Title::getLinksTo',
1896                         $options );
1897
1898                 $retVal = array();
1899                 if ( $db->numRows( $res ) ) {
1900                         while ( $row = $db->fetchObject( $res ) ) {
1901                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1902                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1903                                         $retVal[] = $titleObj;
1904                                 }
1905                         }
1906                 }
1907                 $db->freeResult( $res );
1908                 return $retVal;
1909         }
1910
1911         /**
1912          * Get an array of Title objects using this Title as a template
1913          * Also stores the IDs in the link cache.
1914          *
1915          * WARNING: do not use this function on arbitrary user-supplied titles!
1916          * On heavily-used templates it will max out the memory.
1917          *
1918          * @param string $options may be FOR UPDATE
1919          * @return array the Title objects linking here
1920          */
1921         public function getTemplateLinksTo( $options = '' ) {
1922                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1923         }
1924
1925         /**
1926          * Get an array of Title objects referring to non-existent articles linked from this page
1927          *
1928          * @param string $options may be FOR UPDATE
1929          * @return array the Title objects
1930          */
1931         public function getBrokenLinksFrom( $options = '' ) {
1932                 if ( $options ) {
1933                         $db = wfGetDB( DB_MASTER );
1934                 } else {
1935                         $db = wfGetDB( DB_SLAVE );
1936                 }
1937
1938                 $res = $db->safeQuery(
1939                           "SELECT pl_namespace, pl_title
1940                              FROM !
1941                         LEFT JOIN !
1942                                ON pl_namespace=page_namespace
1943                               AND pl_title=page_title
1944                             WHERE pl_from=?
1945                               AND page_namespace IS NULL
1946                                   !",
1947                         $db->tableName( 'pagelinks' ),
1948                         $db->tableName( 'page' ),
1949                         $this->getArticleId(),
1950                         $options );
1951
1952                 $retVal = array();
1953                 if ( $db->numRows( $res ) ) {
1954                         while ( $row = $db->fetchObject( $res ) ) {
1955                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1956                         }
1957                 }
1958                 $db->freeResult( $res );
1959                 return $retVal;
1960         }
1961
1962
1963         /**
1964          * Get a list of URLs to purge from the Squid cache when this
1965          * page changes
1966          *
1967          * @return array the URLs
1968          */
1969         public function getSquidURLs() {
1970                 global $wgContLang;
1971
1972                 $urls = array(
1973                         $this->getInternalURL(),
1974                         $this->getInternalURL( 'action=history' )
1975                 );
1976
1977                 // purge variant urls as well
1978                 if($wgContLang->hasVariants()){
1979                         $variants = $wgContLang->getVariants();
1980                         foreach($variants as $vCode){
1981                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
1982                                 $urls[] = $this->getInternalURL('',$vCode);
1983                         }
1984                 }
1985
1986                 return $urls;
1987         }
1988
1989         public function purgeSquid() {
1990                 global $wgUseSquid;
1991                 if ( $wgUseSquid ) {
1992                         $urls = $this->getSquidURLs();
1993                         $u = new SquidUpdate( $urls );
1994                         $u->doUpdate();
1995                 }
1996         }
1997
1998         /**
1999          * Move this page without authentication
2000          * @param Title &$nt the new page Title
2001          */
2002         public function moveNoAuth( &$nt ) {
2003                 return $this->moveTo( $nt, false );
2004         }
2005
2006         /**
2007          * Check whether a given move operation would be valid.
2008          * Returns true if ok, or a message key string for an error message
2009          * if invalid. (Scarrrrry ugly interface this.)
2010          * @param Title &$nt the new title
2011          * @param bool $auth indicates whether $wgUser's permissions
2012          *      should be checked
2013          * @return mixed true on success, message name on failure
2014          */
2015         public function isValidMoveOperation( &$nt, $auth = true ) {
2016                 if( !$this or !$nt ) {
2017                         return 'badtitletext';
2018                 }
2019                 if( $this->equals( $nt ) ) {
2020                         return 'selfmove';
2021                 }
2022                 if( !$this->isMovable() || !$nt->isMovable() ) {
2023                         return 'immobile_namespace';
2024                 }
2025
2026                 $oldid = $this->getArticleID();
2027                 $newid = $nt->getArticleID();
2028
2029                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2030                         return 'articleexists';
2031                 }
2032                 if ( ( '' == $this->getDBkey() ) ||
2033                          ( !$oldid ) ||
2034                      ( '' == $nt->getDBkey() ) ) {
2035                         return 'badarticleerror';
2036                 }
2037
2038                 if ( $auth && (
2039                                 !$this->userCan( 'edit' ) || !$nt->userCan( 'edit' ) ||
2040                                 !$this->userCan( 'move' ) || !$nt->userCan( 'move' ) ) ) {
2041                         return 'protectedpage';
2042                 }
2043
2044                 # The move is allowed only if (1) the target doesn't exist, or
2045                 # (2) the target is a redirect to the source, and has no history
2046                 # (so we can undo bad moves right after they're done).
2047
2048                 if ( 0 != $newid ) { # Target exists; check for validity
2049                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2050                                 return 'articleexists';
2051                         }
2052                 }
2053                 return true;
2054         }
2055
2056         /**
2057          * Move a title to a new location
2058          * @param Title &$nt the new title
2059          * @param bool $auth indicates whether $wgUser's permissions
2060          *      should be checked
2061          * @return mixed true on success, message name on failure
2062          */
2063         public function moveTo( &$nt, $auth = true, $reason = '' ) {
2064                 $err = $this->isValidMoveOperation( $nt, $auth );
2065                 if( is_string( $err ) ) {
2066                         return $err;
2067                 }
2068
2069                 $pageid = $this->getArticleID();
2070                 if( $nt->exists() ) {
2071                         $this->moveOverExistingRedirect( $nt, $reason );
2072                         $pageCountChange = 0;
2073                 } else { # Target didn't exist, do normal move.
2074                         $this->moveToNewTitle( $nt, $reason );
2075                         $pageCountChange = 1;
2076                 }
2077                 $redirid = $this->getArticleID();
2078
2079                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
2080                 $dbw = wfGetDB( DB_MASTER );
2081                 $categorylinks = $dbw->tableName( 'categorylinks' );
2082                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
2083                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
2084                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
2085                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
2086
2087                 # Update watchlists
2088
2089                 $oldnamespace = $this->getNamespace() & ~1;
2090                 $newnamespace = $nt->getNamespace() & ~1;
2091                 $oldtitle = $this->getDBkey();
2092                 $newtitle = $nt->getDBkey();
2093
2094                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2095                         WatchedItem::duplicateEntries( $this, $nt );
2096                 }
2097
2098                 # Update search engine
2099                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2100                 $u->doUpdate();
2101                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2102                 $u->doUpdate();
2103
2104                 # Update site_stats
2105                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2106                         # No longer a content page
2107                         # Not viewed, edited, removing
2108                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2109                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2110                         # Now a content page
2111                         # Not viewed, edited, adding
2112                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2113                 } elseif( $pageCountChange ) {
2114                         # Redirect added
2115                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2116                 } else {
2117                         # Nothing special
2118                         $u = false;
2119                 }
2120                 if( $u )
2121                         $u->doUpdate();
2122
2123                 global $wgUser;
2124                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2125                 return true;
2126         }
2127
2128         /**
2129          * Move page to a title which is at present a redirect to the
2130          * source page
2131          *
2132          * @param Title &$nt the page to move to, which should currently
2133          *      be a redirect
2134          */
2135         private function moveOverExistingRedirect( &$nt, $reason = '' ) {
2136                 global $wgUseSquid;
2137                 $fname = 'Title::moveOverExistingRedirect';
2138                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2139
2140                 if ( $reason ) {
2141                         $comment .= ": $reason";
2142                 }
2143
2144                 $now = wfTimestampNow();
2145                 $newid = $nt->getArticleID();
2146                 $oldid = $this->getArticleID();
2147                 $dbw = wfGetDB( DB_MASTER );
2148                 $linkCache =& LinkCache::singleton();
2149
2150                 # Delete the old redirect. We don't save it to history since
2151                 # by definition if we've got here it's rather uninteresting.
2152                 # We have to remove it so that the next step doesn't trigger
2153                 # a conflict on the unique namespace+title index...
2154                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2155
2156                 # Save a null revision in the page's history notifying of the move
2157                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2158                 $nullRevId = $nullRevision->insertOn( $dbw );
2159
2160                 # Change the name of the target page:
2161                 $dbw->update( 'page',
2162                         /* SET */ array(
2163                                 'page_touched'   => $dbw->timestamp($now),
2164                                 'page_namespace' => $nt->getNamespace(),
2165                                 'page_title'     => $nt->getDBkey(),
2166                                 'page_latest'    => $nullRevId,
2167                         ),
2168                         /* WHERE */ array( 'page_id' => $oldid ),
2169                         $fname
2170                 );
2171                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2172
2173                 # Recreate the redirect, this time in the other direction.
2174                 $mwRedir = MagicWord::get( 'redirect' );
2175                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2176                 $redirectArticle = new Article( $this );
2177                 $newid = $redirectArticle->insertOn( $dbw );
2178                 $redirectRevision = new Revision( array(
2179                         'page'    => $newid,
2180                         'comment' => $comment,
2181                         'text'    => $redirectText ) );
2182                 $redirectRevision->insertOn( $dbw );
2183                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2184                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2185
2186                 # Log the move
2187                 $log = new LogPage( 'move' );
2188                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2189
2190                 # Now, we record the link from the redirect to the new title.
2191                 # It should have no other outgoing links...
2192                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2193                 $dbw->insert( 'pagelinks',
2194                         array(
2195                                 'pl_from'      => $newid,
2196                                 'pl_namespace' => $nt->getNamespace(),
2197                                 'pl_title'     => $nt->getDbKey() ),
2198                         $fname );
2199
2200                 # Purge squid
2201                 if ( $wgUseSquid ) {
2202                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2203                         $u = new SquidUpdate( $urls );
2204                         $u->doUpdate();
2205                 }
2206         }
2207
2208         /**
2209          * Move page to non-existing title.
2210          * @param Title &$nt the new Title
2211          */
2212         private function moveToNewTitle( &$nt, $reason = '' ) {
2213                 global $wgUseSquid;
2214                 $fname = 'MovePageForm::moveToNewTitle';
2215                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2216                 if ( $reason ) {
2217                         $comment .= ": $reason";
2218                 }
2219
2220                 $newid = $nt->getArticleID();
2221                 $oldid = $this->getArticleID();
2222                 $dbw = wfGetDB( DB_MASTER );
2223                 $now = $dbw->timestamp();
2224                 $linkCache =& LinkCache::singleton();
2225
2226                 # Save a null revision in the page's history notifying of the move
2227                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2228                 $nullRevId = $nullRevision->insertOn( $dbw );
2229
2230                 # Rename cur entry
2231                 $dbw->update( 'page',
2232                         /* SET */ array(
2233                                 'page_touched'   => $now,
2234                                 'page_namespace' => $nt->getNamespace(),
2235                                 'page_title'     => $nt->getDBkey(),
2236                                 'page_latest'    => $nullRevId,
2237                         ),
2238                         /* WHERE */ array( 'page_id' => $oldid ),
2239                         $fname
2240                 );
2241
2242                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2243
2244                 # Insert redirect
2245                 $mwRedir = MagicWord::get( 'redirect' );
2246                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2247                 $redirectArticle = new Article( $this );
2248                 $newid = $redirectArticle->insertOn( $dbw );
2249                 $redirectRevision = new Revision( array(
2250                         'page'    => $newid,
2251                         'comment' => $comment,
2252                         'text'    => $redirectText ) );
2253                 $redirectRevision->insertOn( $dbw );
2254                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2255                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2256
2257                 # Log the move
2258                 $log = new LogPage( 'move' );
2259                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2260
2261                 # Purge caches as per article creation
2262                 Article::onArticleCreate( $nt );
2263
2264                 # Record the just-created redirect's linking to the page
2265                 $dbw->insert( 'pagelinks',
2266                         array(
2267                                 'pl_from'      => $newid,
2268                                 'pl_namespace' => $nt->getNamespace(),
2269                                 'pl_title'     => $nt->getDBkey() ),
2270                         $fname );
2271
2272                 # Purge old title from squid
2273                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2274                 $this->purgeSquid();
2275         }
2276
2277         /**
2278          * Checks if $this can be moved to a given Title
2279          * - Selects for update, so don't call it unless you mean business
2280          *
2281          * @param Title &$nt the new title to check
2282          */
2283         public function isValidMoveTarget( $nt ) {
2284
2285                 $fname = 'Title::isValidMoveTarget';
2286                 $dbw = wfGetDB( DB_MASTER );
2287
2288                 # Is it a redirect?
2289                 $id  = $nt->getArticleID();
2290                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2291                         array( 'page_is_redirect','old_text','old_flags' ),
2292                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2293                         $fname, 'FOR UPDATE' );
2294
2295                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2296                         # Not a redirect
2297                         wfDebug( __METHOD__ . ": not a redirect\n" );
2298                         return false;
2299                 }
2300                 $text = Revision::getRevisionText( $obj );
2301
2302                 # Does the redirect point to the source?
2303                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2304                 $m = array();
2305                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2306                         $redirTitle = Title::newFromText( $m[1] );
2307                         if( !is_object( $redirTitle ) ||
2308                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2309                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2310                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2311                                 return false;
2312                         }
2313                 } else {
2314                         # Fail safe
2315                         wfDebug( __METHOD__ . ": failsafe\n" );
2316                         return false;
2317                 }
2318
2319                 # Does the article have a history?
2320                 $row = $dbw->selectRow( array( 'page', 'revision'),
2321                         array( 'rev_id' ),
2322                         array( 'page_namespace' => $nt->getNamespace(),
2323                                 'page_title' => $nt->getDBkey(),
2324                                 'page_id=rev_page AND page_latest != rev_id'
2325                         ), $fname, 'FOR UPDATE'
2326                 );
2327
2328                 # Return true if there was no history
2329                 return $row === false;
2330         }
2331
2332         /**
2333          * Get categories to which this Title belongs and return an array of
2334          * categories' names.
2335          *
2336          * @return array an array of parents in the form:
2337          *      $parent => $currentarticle
2338          */
2339         public function getParentCategories() {
2340                 global $wgContLang;
2341
2342                 $titlekey = $this->getArticleId();
2343                 $dbr = wfGetDB( DB_SLAVE );
2344                 $categorylinks = $dbr->tableName( 'categorylinks' );
2345
2346                 # NEW SQL
2347                 $sql = "SELECT * FROM $categorylinks"
2348                      ." WHERE cl_from='$titlekey'"
2349                          ." AND cl_from <> '0'"
2350                          ." ORDER BY cl_sortkey";
2351
2352                 $res = $dbr->query ( $sql ) ;
2353
2354                 if($dbr->numRows($res) > 0) {
2355                         while ( $x = $dbr->fetchObject ( $res ) )
2356                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2357                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2358                         $dbr->freeResult ( $res ) ;
2359                 } else {
2360                         $data = '';
2361                 }
2362                 return $data;
2363         }
2364
2365         /**
2366          * Get a tree of parent categories
2367          * @param array $children an array with the children in the keys, to check for circular refs
2368          * @return array
2369          */
2370         public function getParentCategoryTree( $children = array() ) {
2371                 $parents = $this->getParentCategories();
2372
2373                 if($parents != '') {
2374                         foreach($parents as $parent => $current) {
2375                                 if ( array_key_exists( $parent, $children ) ) {
2376                                         # Circular reference
2377                                         $stack[$parent] = array();
2378                                 } else {
2379                                         $nt = Title::newFromText($parent);
2380                                         if ( $nt ) {
2381                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2382                                         }
2383                                 }
2384                         }
2385                         return $stack;
2386                 } else {
2387                         return array();
2388                 }
2389         }
2390
2391
2392         /**
2393          * Get an associative array for selecting this title from
2394          * the "page" table
2395          *
2396          * @return array
2397          */
2398         public function pageCond() {
2399                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2400         }
2401
2402         /**
2403          * Get the revision ID of the previous revision
2404          *
2405          * @param integer $revision  Revision ID. Get the revision that was before this one.
2406          * @return integer $oldrevision|false
2407          */
2408         public function getPreviousRevisionID( $revision ) {
2409                 $dbr = wfGetDB( DB_SLAVE );
2410                 return $dbr->selectField( 'revision', 'rev_id',
2411                         'rev_page=' . intval( $this->getArticleId() ) .
2412                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2413         }
2414
2415         /**
2416          * Get the revision ID of the next revision
2417          *
2418          * @param integer $revision  Revision ID. Get the revision that was after this one.
2419          * @return integer $oldrevision|false
2420          */
2421         public function getNextRevisionID( $revision ) {
2422                 $dbr = wfGetDB( DB_SLAVE );
2423                 return $dbr->selectField( 'revision', 'rev_id',
2424                         'rev_page=' . intval( $this->getArticleId() ) .
2425                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2426         }
2427
2428         /**
2429          * Get the number of revisions between the given revision IDs.
2430          *
2431          * @param integer $old  Revision ID.
2432          * @param integer $new  Revision ID.
2433          * @return integer  Number of revisions between these IDs.
2434          */
2435         public function countRevisionsBetween( $old, $new ) {
2436                 $dbr = wfGetDB( DB_SLAVE );
2437                 return $dbr->selectField( 'revision', 'count(*)',
2438                         'rev_page = ' . intval( $this->getArticleId() ) .
2439                         ' AND rev_id > ' . intval( $old ) .
2440                         ' AND rev_id < ' . intval( $new ) );
2441         }
2442
2443         /**
2444          * Compare with another title.
2445          *
2446          * @param Title $title
2447          * @return bool
2448          */
2449         public function equals( $title ) {
2450                 // Note: === is necessary for proper matching of number-like titles.
2451                 return $this->getInterwiki() === $title->getInterwiki()
2452                         && $this->getNamespace() == $title->getNamespace()
2453                         && $this->getDbkey() === $title->getDbkey();
2454         }
2455
2456         /**
2457          * Check if page exists
2458          * @return bool
2459          */
2460         public function exists() {
2461                 return $this->getArticleId() != 0;
2462         }
2463
2464         /**
2465          * Should a link should be displayed as a known link, just based on its title?
2466          *
2467          * Currently, a self-link with a fragment and special pages are in
2468          * this category. Special pages never exist in the database.
2469          */
2470         public function isAlwaysKnown() {
2471                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2472                   || NS_SPECIAL == $this->mNamespace;
2473         }
2474
2475         /**
2476          * Update page_touched timestamps and send squid purge messages for
2477          * pages linking to this title. May be sent to the job queue depending
2478          * on the number of links. Typically called on create and delete.
2479          */
2480         public function touchLinks() {
2481                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2482                 $u->doUpdate();
2483
2484                 if ( $this->getNamespace() == NS_CATEGORY ) {
2485                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2486                         $u->doUpdate();
2487                 }
2488         }
2489
2490         /**
2491          * Get the last touched timestamp
2492          */
2493         public function getTouched() {
2494                 $dbr = wfGetDB( DB_SLAVE );
2495                 $touched = $dbr->selectField( 'page', 'page_touched',
2496                         array(
2497                                 'page_namespace' => $this->getNamespace(),
2498                                 'page_title' => $this->getDBkey()
2499                         ), __METHOD__
2500                 );
2501                 return $touched;
2502         }
2503
2504         /**
2505          * Get a cached value from a global cache that is invalidated when this page changes
2506          * @param string $key the key
2507          * @param callback $callback A callback function which generates the value on cache miss
2508          *
2509          * @deprecated use DependencyWrapper
2510          */
2511         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2512                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2513                         $params, new TitleDependency( $this ) );
2514         }
2515
2516         public function trackbackURL() {
2517                 global $wgTitle, $wgScriptPath, $wgServer;
2518
2519                 return "$wgServer$wgScriptPath/trackback.php?article="
2520                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2521         }
2522
2523         public function trackbackRDF() {
2524                 $url = htmlspecialchars($this->getFullURL());
2525                 $title = htmlspecialchars($this->getText());
2526                 $tburl = $this->trackbackURL();
2527
2528                 return "
2529 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2530          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2531          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2532 <rdf:Description
2533    rdf:about=\"$url\"
2534    dc:identifier=\"$url\"
2535    dc:title=\"$title\"
2536    trackback:ping=\"$tburl\" />
2537 </rdf:RDF>";
2538         }
2539
2540         /**
2541          * Generate strings used for xml 'id' names in monobook tabs
2542          * @return string
2543          */
2544         public function getNamespaceKey() {
2545                 global $wgContLang;
2546                 switch ($this->getNamespace()) {
2547                         case NS_MAIN:
2548                         case NS_TALK:
2549                                 return 'nstab-main';
2550                         case NS_USER:
2551                         case NS_USER_TALK:
2552                                 return 'nstab-user';
2553                         case NS_MEDIA:
2554                                 return 'nstab-media';
2555                         case NS_SPECIAL:
2556                                 return 'nstab-special';
2557                         case NS_PROJECT:
2558                         case NS_PROJECT_TALK:
2559                                 return 'nstab-project';
2560                         case NS_IMAGE:
2561                         case NS_IMAGE_TALK:
2562                                 return 'nstab-image';
2563                         case NS_MEDIAWIKI:
2564                         case NS_MEDIAWIKI_TALK:
2565                                 return 'nstab-mediawiki';
2566                         case NS_TEMPLATE:
2567                         case NS_TEMPLATE_TALK:
2568                                 return 'nstab-template';
2569                         case NS_HELP:
2570                         case NS_HELP_TALK:
2571                                 return 'nstab-help';
2572                         case NS_CATEGORY:
2573                         case NS_CATEGORY_TALK:
2574                                 return 'nstab-category';
2575                         default:
2576                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2577                 }
2578         }
2579
2580         /**
2581          * Returns true if this title resolves to the named special page
2582          * @param string $name The special page name
2583          */
2584         public function isSpecial( $name ) {
2585                 if ( $this->getNamespace() == NS_SPECIAL ) {
2586                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2587                         if ( $name == $thisName ) {
2588                                 return true;
2589                         }
2590                 }
2591                 return false;
2592         }
2593
2594         /**
2595          * If the Title refers to a special page alias which is not the local default,
2596          * returns a new Title which points to the local default. Otherwise, returns $this.
2597          */
2598         public function fixSpecialName() {
2599                 if ( $this->getNamespace() == NS_SPECIAL ) {
2600                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2601                         if ( $canonicalName ) {
2602                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2603                                 if ( $localName != $this->mDbkeyform ) {
2604                                         return Title::makeTitle( NS_SPECIAL, $localName );
2605                                 }
2606                         }
2607                 }
2608                 return $this;
2609         }
2610
2611         /**
2612          * Is this Title in a namespace which contains content?
2613          * In other words, is this a content page, for the purposes of calculating
2614          * statistics, etc?
2615          *
2616          * @return bool
2617          */
2618         public function isContentPage() {
2619                 return Namespace::isContent( $this->getNamespace() );
2620         }
2621
2622 }
2623
2624 ?>