includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  */
   6
   7 /** */
   8 require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
   9
  10 define ( 'GAID_FOR_UPDATE', 1 );
  11
  12 # Title::newFromTitle maintains a cache to avoid
  13 # expensive re-normalization of commonly used titles.
  14 # On a batch operation this can become a memory leak
  15 # if not bounded. After hitting this many titles,
  16 # reset the cache.
  17 define( 'MW_TITLECACHE_MAX', 1000 );
  18
  19 # Constants for pr_cascade bitfield
  20 define( 'CASCADE', 1 );
  21
  22 /**
  23  * Title class
  24  * - Represents a title, which may contain an interwiki designation or namespace
  25  * - Can fetch various kinds of data from the database, albeit inefficiently.
  26  *
  27  */
  28 class Title {
  29         /**
  30          * Static cache variables
  31          */
  32         static private $titleCache=array();
  33         static private $interwikiCache=array();
  34
  35
  36         /**
  37          * All member variables should be considered private
  38          * Please use the accessor functions
  39          */
  40
  41          /**#@+
  42          * @private
  43          */
  44
  45         var $mTextform;                 # Text form (spaces not underscores) of the main part
  46         var $mUrlform;                  # URL-encoded form of the main part
  47         var $mDbkeyform;                # Main part with underscores
  48         var $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  49         var $mInterwiki;                # Interwiki prefix (or null string)
  50         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  51         var $mArticleID;                # Article ID, fetched from the link cache on demand
  52         var $mLatestID;                 # ID of most recent revision
  53         var $mRestrictions;             # Array of groups allowed to edit this article
  54         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  55         var $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  56         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  57         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  58         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  59         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  60         var $mDefaultNamespace;         # Namespace index when there is no namespace
  61                                         # Zero except in {{transclusion}} tags
  62         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  63         /**#@-*/
  64
  65
  66         /**
  67          * Constructor
  68          * @private
  69          */
  70         /* private */ function __construct() {
  71                 $this->mInterwiki = $this->mUrlform =
  72                 $this->mTextform = $this->mDbkeyform = '';
  73                 $this->mArticleID = -1;
  74                 $this->mNamespace = NS_MAIN;
  75                 $this->mRestrictionsLoaded = false;
  76                 $this->mRestrictions = array();
  77                 # Dont change the following, NS_MAIN is hardcoded in several place
  78                 # See bug #696
  79                 $this->mDefaultNamespace = NS_MAIN;
  80                 $this->mWatched = NULL;
  81                 $this->mLatestID = false;
  82                 $this->mOldRestrictions = false;
  83         }
  84
  85         /**
  86          * Create a new Title from a prefixed DB key
  87          * @param string $key The database key, which has underscores
  88          *      instead of spaces, possibly including namespace and
  89          *      interwiki prefixes
  90          * @return Title the new object, or NULL on an error
  91          * @static
  92          * @access public
  93          */
  94         /* static */ function newFromDBkey( $key ) {
  95                 $t = new Title();
  96                 $t->mDbkeyform = $key;
  97                 if( $t->secureAndSplit() )
  98                         return $t;
  99                 else
 100                         return NULL;
 101         }
 102
 103         /**
 104          * Create a new Title from text, such as what one would
 105          * find in a link. Decodes any HTML entities in the text.
 106          *
 107          * @param string $text the link text; spaces, prefixes,
 108          *      and an initial ':' indicating the main namespace
 109          *      are accepted
 110          * @param int $defaultNamespace the namespace to use if
 111          *      none is specified by a prefix
 112          * @return Title the new object, or NULL on an error
 113          * @static
 114          * @access public
 115          */
 116         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 117                 if( is_object( $text ) ) {
 118                         throw new MWException( 'Title::newFromText given an object' );
 119                 }
 120
 121                 /**
 122                  * Wiki pages often contain multiple links to the same page.
 123                  * Title normalization and parsing can become expensive on
 124                  * pages with many links, so we can save a little time by
 125                  * caching them.
 126                  *
 127                  * In theory these are value objects and won't get changed...
 128                  */
 129                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 130                         return Title::$titleCache[$text];
 131                 }
 132
 133                 /**
 134                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 135                  */
 136                 $filteredText = Sanitizer::decodeCharReferences( $text );
 137
 138                 $t = new Title();
 139                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 140                 $t->mDefaultNamespace = $defaultNamespace;
 141
 142                 static $cachedcount = 0 ;
 143                 if( $t->secureAndSplit() ) {
 144                         if( $defaultNamespace == NS_MAIN ) {
 145                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 146                                         # Avoid memory leaks on mass operations...
 147                                         Title::$titleCache = array();
 148                                         $cachedcount=0;
 149                                 }
 150                                 $cachedcount++;
 151                                 Title::$titleCache[$text] =& $t;
 152                         }
 153                         return $t;
 154                 } else {
 155                         $ret = NULL;
 156                         return $ret;
 157                 }
 158         }
 159
 160         /**
 161          * Create a new Title from URL-encoded text. Ensures that
 162          * the given title's length does not exceed the maximum.
 163          * @param string $url the title, as might be taken from a URL
 164          * @param bool $isvalid, allows for multiple colons and characters set as illegal
 165          * @return Title the new object, or NULL on an error
 166          * @static
 167          * @access public
 168          */
 169         public static function newFromURL( $url, $isvalid=true ) {
 170                 global $wgLegalTitleChars;
 171                 $t = new Title();
 172
 173                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 174                 # but some URLs used it as a space replacement and they still come
 175                 # from some external search tools.
 176                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 177                         $url = str_replace( '+', ' ', $url );
 178                 }
 179
 180                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 181                 if( $t->secureAndSplit( $isvalid ) ) {
 182                         return $t;
 183                 } else {
 184                         return NULL;
 185                 }
 186         }
 187
 188         /**
 189          * Create a new Title from an article ID
 190          *
 191          * @todo This is inefficiently implemented, the page row is requested
 192          *       but not used for anything else
 193          *
 194          * @param int $id the page_id corresponding to the Title to create
 195          * @return Title the new object, or NULL on an error
 196          * @access public
 197          * @static
 198          */
 199         public static function newFromID( $id ) {
 200                 $fname = 'Title::newFromID';
 201                 $dbr = wfGetDB( DB_SLAVE );
 202                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 203                         array( 'page_id' => $id ), $fname );
 204                 if ( $row !== false ) {
 205                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 206                 } else {
 207                         $title = NULL;
 208                 }
 209                 return $title;
 210         }
 211
 212         /**
 213          * Make an array of titles from an array of IDs
 214          */
 215         function newFromIDs( $ids ) {
 216                 $dbr = wfGetDB( DB_SLAVE );
 217                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 218                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 219
 220                 $titles = array();
 221                 while ( $row = $dbr->fetchObject( $res ) ) {
 222                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 223                 }
 224                 return $titles;
 225         }
 226
 227         /**
 228          * Create a new Title from a namespace index and a DB key.
 229          * It's assumed that $ns and $title are *valid*, for instance when
 230          * they came directly from the database or a special page name.
 231          * For convenience, spaces are converted to underscores so that
 232          * eg user_text fields can be used directly.
 233          *
 234          * @param int $ns the namespace of the article
 235          * @param string $title the unprefixed database key form
 236          * @return Title the new object
 237          * @static
 238          * @access public
 239          */
 240         public static function &makeTitle( $ns, $title ) {
 241                 $t = new Title();
 242                 $t->mInterwiki = '';
 243                 $t->mFragment = '';
 244                 $t->mNamespace = intval( $ns );
 245                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 246                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 247                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 248                 $t->mTextform = str_replace( '_', ' ', $title );
 249                 return $t;
 250         }
 251
 252         /**
 253          * Create a new Title from a namespace index and a DB key.
 254          * The parameters will be checked for validity, which is a bit slower
 255          * than makeTitle() but safer for user-provided data.
 256          *
 257          * @param int $ns the namespace of the article
 258          * @param string $title the database key form
 259          * @return Title the new object, or NULL on an error
 260          * @static
 261          * @access public
 262          */
 263         public static function makeTitleSafe( $ns, $title ) {
 264                 $t = new Title();
 265                 $t->mDbkeyform = Title::makeName( $ns, $title );
 266                 if( $t->secureAndSplit() ) {
 267                         return $t;
 268                 } else {
 269                         return NULL;
 270                 }
 271         }
 272
 273         /**
 274          * Create a new Title for the Main Page
 275          *
 276          * @static
 277          * @return Title the new object
 278          * @access public
 279          */
 280         public static function newMainPage() {
 281                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 282         }
 283
 284         /**
 285          * Create a new Title for a redirect
 286          * @param string $text the redirect title text
 287          * @return Title the new object, or NULL if the text is not a
 288          *      valid redirect
 289          */
 290         public static function newFromRedirect( $text ) {
 291                 $mwRedir = MagicWord::get( 'redirect' );
 292                 $rt = NULL;
 293                 if ( $mwRedir->matchStart( $text ) ) {
 294                         $m = array();
 295                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 296                                 # categories are escaped using : for example one can enter:
 297                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 298                                 if ( substr($m[1],0,1) == ':') {
 299                                         # We don't want to keep the ':'
 300                                         $m[1] = substr( $m[1], 1 );
 301                                 }
 302
 303                                 $rt = Title::newFromText( $m[1] );
 304                                 # Disallow redirects to Special:Userlogout
 305                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 306                                         $rt = NULL;
 307                                 }
 308                         }
 309                 }
 310                 return $rt;
 311         }
 312
 313 #----------------------------------------------------------------------------
 314 #       Static functions
 315 #----------------------------------------------------------------------------
 316
 317         /**
 318          * Get the prefixed DB key associated with an ID
 319          * @param int $id the page_id of the article
 320          * @return Title an object representing the article, or NULL
 321          *      if no such article was found
 322          * @static
 323          * @access public
 324          */
 325         function nameOf( $id ) {
 326                 $fname = 'Title::nameOf';
 327                 $dbr = wfGetDB( DB_SLAVE );
 328
 329                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 330                 if ( $s === false ) { return NULL; }
 331
 332                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 333                 return $n;
 334         }
 335
 336         /**
 337          * Get a regex character class describing the legal characters in a link
 338          * @return string the list of characters, not delimited
 339          * @static
 340          * @access public
 341          */
 342         public static function legalChars() {
 343                 global $wgLegalTitleChars;
 344                 return $wgLegalTitleChars;
 345         }
 346
 347         /**
 348          * Get a string representation of a title suitable for
 349          * including in a search index
 350          *
 351          * @param int $ns a namespace index
 352          * @param string $title text-form main part
 353          * @return string a stripped-down title string ready for the
 354          *      search index
 355          */
 356         public static function indexTitle( $ns, $title ) {
 357                 global $wgContLang;
 358
 359                 $lc = SearchEngine::legalSearchChars() . '&#;';
 360                 $t = $wgContLang->stripForSearch( $title );
 361                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 362                 $t = $wgContLang->lc( $t );
 363
 364                 # Handle 's, s'
 365                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 366                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 367
 368                 $t = preg_replace( "/\\s+/", ' ', $t );
 369
 370                 if ( $ns == NS_IMAGE ) {
 371                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 372                 }
 373                 return trim( $t );
 374         }
 375
 376         /*
 377          * Make a prefixed DB key from a DB key and a namespace index
 378          * @param int $ns numerical representation of the namespace
 379          * @param string $title the DB key form the title
 380          * @return string the prefixed form of the title
 381          */
 382         public static function makeName( $ns, $title ) {
 383                 global $wgContLang;
 384
 385                 $n = $wgContLang->getNsText( $ns );
 386                 return $n == '' ? $title : "$n:$title";
 387         }
 388
 389         /**
 390          * Returns the URL associated with an interwiki prefix
 391          * @param string $key the interwiki prefix (e.g. "MeatBall")
 392          * @return the associated URL, containing "$1", which should be
 393          *      replaced by an article title
 394          * @static (arguably)
 395          * @access public
 396          */
 397         function getInterwikiLink( $key )  {
 398                 global $wgMemc, $wgInterwikiExpiry;
 399                 global $wgInterwikiCache, $wgContLang;
 400                 $fname = 'Title::getInterwikiLink';
 401
 402                 $key = $wgContLang->lc( $key );
 403
 404                 $k = wfMemcKey( 'interwiki', $key );
 405                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 406                         return Title::$interwikiCache[$k]->iw_url;
 407                 }
 408
 409                 if ($wgInterwikiCache) {
 410                         return Title::getInterwikiCached( $key );
 411                 }
 412
 413                 $s = $wgMemc->get( $k );
 414                 # Ignore old keys with no iw_local
 415                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 416                         Title::$interwikiCache[$k] = $s;
 417                         return $s->iw_url;
 418                 }
 419
 420                 $dbr = wfGetDB( DB_SLAVE );
 421                 $res = $dbr->select( 'interwiki',
 422                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 423                         array( 'iw_prefix' => $key ), $fname );
 424                 if( !$res ) {
 425                         return '';
 426                 }
 427
 428                 $s = $dbr->fetchObject( $res );
 429                 if( !$s ) {
 430                         # Cache non-existence: create a blank object and save it to memcached
 431                         $s = (object)false;
 432                         $s->iw_url = '';
 433                         $s->iw_local = 0;
 434                         $s->iw_trans = 0;
 435                 }
 436                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 437                 Title::$interwikiCache[$k] = $s;
 438
 439                 return $s->iw_url;
 440         }
 441
 442         /**
 443          * Fetch interwiki prefix data from local cache in constant database
 444          *
 445          * More logic is explained in DefaultSettings
 446          *
 447          * @return string URL of interwiki site
 448          * @access public
 449          */
 450         function getInterwikiCached( $key ) {
 451                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 452                 static $db, $site;
 453
 454                 if (!$db)
 455                         $db=dba_open($wgInterwikiCache,'r','cdb');
 456                 /* Resolve site name */
 457                 if ($wgInterwikiScopes>=3 and !$site) {
 458                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 459                         if ($site=="")
 460                                 $site = $wgInterwikiFallbackSite;
 461                 }
 462                 $value = dba_fetch( wfMemcKey( $key ), $db);
 463                 if ($value=='' and $wgInterwikiScopes>=3) {
 464                         /* try site-level */
 465                         $value = dba_fetch("_{$site}:{$key}", $db);
 466                 }
 467                 if ($value=='' and $wgInterwikiScopes>=2) {
 468                         /* try globals */
 469                         $value = dba_fetch("__global:{$key}", $db);
 470                 }
 471                 if ($value=='undef')
 472                         $value='';
 473                 $s = (object)false;
 474                 $s->iw_url = '';
 475                 $s->iw_local = 0;
 476                 $s->iw_trans = 0;
 477                 if ($value!='') {
 478                         list($local,$url)=explode(' ',$value,2);
 479                         $s->iw_url=$url;
 480                         $s->iw_local=(int)$local;
 481                 }
 482                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 483                 return $s->iw_url;
 484         }
 485         /**
 486          * Determine whether the object refers to a page within
 487          * this project.
 488          *
 489          * @return bool TRUE if this is an in-project interwiki link
 490          *      or a wikilink, FALSE otherwise
 491          * @access public
 492          */
 493         function isLocal() {
 494                 if ( $this->mInterwiki != '' ) {
 495                         # Make sure key is loaded into cache
 496                         $this->getInterwikiLink( $this->mInterwiki );
 497                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 498                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 499                 } else {
 500                         return true;
 501                 }
 502         }
 503
 504         /**
 505          * Determine whether the object refers to a page within
 506          * this project and is transcludable.
 507          *
 508          * @return bool TRUE if this is transcludable
 509          * @access public
 510          */
 511         function isTrans() {
 512                 if ($this->mInterwiki == '')
 513                         return false;
 514                 # Make sure key is loaded into cache
 515                 $this->getInterwikiLink( $this->mInterwiki );
 516                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 517                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 518         }
 519
 520         /**
 521          * Update the page_touched field for an array of title objects
 522          * @todo Inefficient unless the IDs are already loaded into the
 523          *      link cache
 524          * @param array $titles an array of Title objects to be touched
 525          * @param string $timestamp the timestamp to use instead of the
 526          *      default current time
 527          * @static
 528          * @access public
 529          */
 530         function touchArray( $titles, $timestamp = '' ) {
 531
 532                 if ( count( $titles ) == 0 ) {
 533                         return;
 534                 }
 535                 $dbw = wfGetDB( DB_MASTER );
 536                 if ( $timestamp == '' ) {
 537                         $timestamp = $dbw->timestamp();
 538                 }
 539                 /*
 540                 $page = $dbw->tableName( 'page' );
 541                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 542                 $first = true;
 543
 544                 foreach ( $titles as $title ) {
 545                         if ( $wgUseFileCache ) {
 546                                 $cm = new HTMLFileCache($title);
 547                                 @unlink($cm->fileCacheName());
 548                         }
 549
 550                         if ( ! $first ) {
 551                                 $sql .= ',';
 552                         }
 553                         $first = false;
 554                         $sql .= $title->getArticleID();
 555                 }
 556                 $sql .= ')';
 557                 if ( ! $first ) {
 558                         $dbw->query( $sql, 'Title::touchArray' );
 559                 }
 560                 */
 561                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 562                 // do them in small chunks:
 563                 $fname = 'Title::touchArray';
 564                 foreach( $titles as $title ) {
 565                         $dbw->update( 'page',
 566                                 array( 'page_touched' => $timestamp ),
 567                                 array(
 568                                         'page_namespace' => $title->getNamespace(),
 569                                         'page_title'     => $title->getDBkey() ),
 570                                 $fname );
 571                 }
 572         }
 573
 574         /**
 575          * Escape a text fragment, say from a link, for a URL
 576          */
 577         static function escapeFragmentForURL( $fragment ) {
 578                 $fragment = str_replace( ' ', '_', $fragment );
 579                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 580                 $replaceArray = array(
 581                         '%3A' => ':',
 582                         '%' => '.'
 583                 );
 584                 return strtr( $fragment, $replaceArray );
 585         }
 586
 587 #----------------------------------------------------------------------------
 588 #       Other stuff
 589 #----------------------------------------------------------------------------
 590
 591         /** Simple accessors */
 592         /**
 593          * Get the text form (spaces not underscores) of the main part
 594          * @return string
 595          * @access public
 596          */
 597         function getText() { return $this->mTextform; }
 598         /**
 599          * Get the URL-encoded form of the main part
 600          * @return string
 601          * @access public
 602          */
 603         function getPartialURL() { return $this->mUrlform; }
 604         /**
 605          * Get the main part with underscores
 606          * @return string
 607          * @access public
 608          */
 609         function getDBkey() { return $this->mDbkeyform; }
 610         /**
 611          * Get the namespace index, i.e. one of the NS_xxxx constants
 612          * @return int
 613          * @access public
 614          */
 615         function getNamespace() { return $this->mNamespace; }
 616         /**
 617          * Get the namespace text
 618          * @return string
 619          * @access public
 620          */
 621         function getNsText() {
 622                 global $wgContLang, $wgCanonicalNamespaceNames;
 623
 624                 if ( '' != $this->mInterwiki ) {
 625                         // This probably shouldn't even happen. ohh man, oh yuck.
 626                         // But for interwiki transclusion it sometimes does.
 627                         // Shit. Shit shit shit.
 628                         //
 629                         // Use the canonical namespaces if possible to try to
 630                         // resolve a foreign namespace.
 631                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 632                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 633                         }
 634                 }
 635                 return $wgContLang->getNsText( $this->mNamespace );
 636         }
 637         /**
 638          * Get the namespace text of the subject (rather than talk) page
 639          * @return string
 640          * @access public
 641          */
 642         function getSubjectNsText() {
 643                 global $wgContLang;
 644                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 645         }
 646
 647         /**
 648          * Get the namespace text of the talk page
 649          * @return string
 650          */
 651         function getTalkNsText() {
 652                 global $wgContLang;
 653                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 654         }
 655
 656         /**
 657          * Could this title have a corresponding talk page?
 658          * @return bool
 659          */
 660         function canTalk() {
 661                 return( Namespace::canTalk( $this->mNamespace ) );
 662         }
 663
 664         /**
 665          * Get the interwiki prefix (or null string)
 666          * @return string
 667          * @access public
 668          */
 669         function getInterwiki() { return $this->mInterwiki; }
 670         /**
 671          * Get the Title fragment (i.e. the bit after the #) in text form
 672          * @return string
 673          * @access public
 674          */
 675         function getFragment() { return $this->mFragment; }
 676         /**
 677          * Get the fragment in URL form, including the "#" character if there is one
 678          *
 679          * @return string
 680          * @access public
 681          */
 682         function getFragmentForURL() {
 683                 if ( $this->mFragment == '' ) {
 684                         return '';
 685                 } else {
 686                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 687                 }
 688         }
 689         /**
 690          * Get the default namespace index, for when there is no namespace
 691          * @return int
 692          * @access public
 693          */
 694         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 695
 696         /**
 697          * Get title for search index
 698          * @return string a stripped-down title string ready for the
 699          *      search index
 700          */
 701         function getIndexTitle() {
 702                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 703         }
 704
 705         /**
 706          * Get the prefixed database key form
 707          * @return string the prefixed title, with underscores and
 708          *      any interwiki and namespace prefixes
 709          * @access public
 710          */
 711         function getPrefixedDBkey() {
 712                 $s = $this->prefix( $this->mDbkeyform );
 713                 $s = str_replace( ' ', '_', $s );
 714                 return $s;
 715         }
 716
 717         /**
 718          * Get the prefixed title with spaces.
 719          * This is the form usually used for display
 720          * @return string the prefixed title, with spaces
 721          * @access public
 722          */
 723         function getPrefixedText() {
 724                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 725                         $s = $this->prefix( $this->mTextform );
 726                         $s = str_replace( '_', ' ', $s );
 727                         $this->mPrefixedText = $s;
 728                 }
 729                 return $this->mPrefixedText;
 730         }
 731
 732         /**
 733          * Get the prefixed title with spaces, plus any fragment
 734          * (part beginning with '#')
 735          * @return string the prefixed title, with spaces and
 736          *      the fragment, including '#'
 737          * @access public
 738          */
 739         function getFullText() {
 740                 $text = $this->getPrefixedText();
 741                 if( '' != $this->mFragment ) {
 742                         $text .= '#' . $this->mFragment;
 743                 }
 744                 return $text;
 745         }
 746
 747         /**
 748          * Get the base name, i.e. the leftmost parts before the /
 749          * @return string Base name
 750          */
 751         function getBaseText() {
 752                 global $wgNamespacesWithSubpages;
 753                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 754                         $parts = explode( '/', $this->getText() );
 755                         # Don't discard the real title if there's no subpage involved
 756                         if( count( $parts ) > 1 )
 757                                 unset( $parts[ count( $parts ) - 1 ] );
 758                         return implode( '/', $parts );
 759                 } else {
 760                         return $this->getText();
 761                 }
 762         }
 763
 764         /**
 765          * Get the lowest-level subpage name, i.e. the rightmost part after /
 766          * @return string Subpage name
 767          */
 768         function getSubpageText() {
 769                 global $wgNamespacesWithSubpages;
 770                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 771                         $parts = explode( '/', $this->mTextform );
 772                         return( $parts[ count( $parts ) - 1 ] );
 773                 } else {
 774                         return( $this->mTextform );
 775                 }
 776         }
 777
 778         /**
 779          * Get a URL-encoded form of the subpage text
 780          * @return string URL-encoded subpage name
 781          */
 782         function getSubpageUrlForm() {
 783                 $text = $this->getSubpageText();
 784                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 785                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 786                 return( $text );
 787         }
 788
 789         /**
 790          * Get a URL-encoded title (not an actual URL) including interwiki
 791          * @return string the URL-encoded form
 792          * @access public
 793          */
 794         function getPrefixedURL() {
 795                 $s = $this->prefix( $this->mDbkeyform );
 796                 $s = str_replace( ' ', '_', $s );
 797
 798                 $s = wfUrlencode ( $s ) ;
 799
 800                 # Cleaning up URL to make it look nice -- is this safe?
 801                 $s = str_replace( '%28', '(', $s );
 802                 $s = str_replace( '%29', ')', $s );
 803
 804                 return $s;
 805         }
 806
 807         /**
 808          * Get a real URL referring to this title, with interwiki link and
 809          * fragment
 810          *
 811          * @param string $query an optional query string, not used
 812          *      for interwiki links
 813          * @param string $variant language variant of url (for sr, zh..)
 814          * @return string the URL
 815          * @access public
 816          */
 817         function getFullURL( $query = '', $variant = false ) {
 818                 global $wgContLang, $wgServer, $wgRequest;
 819
 820                 if ( '' == $this->mInterwiki ) {
 821                         $url = $this->getLocalUrl( $query, $variant );
 822
 823                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 824                         // Correct fix would be to move the prepending elsewhere.
 825                         if ($wgRequest->getVal('action') != 'render') {
 826                                 $url = $wgServer . $url;
 827                         }
 828                 } else {
 829                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 830
 831                         $namespace = wfUrlencode( $this->getNsText() );
 832                         if ( '' != $namespace ) {
 833                                 # Can this actually happen? Interwikis shouldn't be parsed.
 834                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 835                                 $namespace .= ':';
 836                         }
 837                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 838                         if( $query != '' ) {
 839                                 if( false === strpos( $url, '?' ) ) {
 840                                         $url .= '?';
 841                                 } else {
 842                                         $url .= '&';
 843                                 }
 844                                 $url .= $query;
 845                         }
 846                 }
 847
 848                 # Finally, add the fragment.
 849                 $url .= $this->getFragmentForURL();
 850
 851                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 852                 return $url;
 853         }
 854
 855         /**
 856          * Get a URL with no fragment or server name.  If this page is generated
 857          * with action=render, $wgServer is prepended.
 858          * @param string $query an optional query string; if not specified,
 859          *      $wgArticlePath will be used.
 860          * @param string $variant language variant of url (for sr, zh..)
 861          * @return string the URL
 862          * @access public
 863          */
 864         function getLocalURL( $query = '', $variant = false ) {
 865                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 866                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 867
 868                 // internal links should point to same variant as current page (only anonymous users)
 869                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 870                         $pref = $wgContLang->getPreferredVariant(false);
 871                         if($pref != $wgContLang->getCode())
 872                                 $variant = $pref;
 873                 }
 874
 875                 if ( $this->isExternal() ) {
 876                         $url = $this->getFullURL();
 877                         if ( $query ) {
 878                                 // This is currently only used for edit section links in the
 879                                 // context of interwiki transclusion. In theory we should
 880                                 // append the query to the end of any existing query string,
 881                                 // but interwiki transclusion is already broken in that case.
 882                                 $url .= "?$query";
 883                         }
 884                 } else {
 885                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 886                         if ( $query == '' ) {
 887                                 if($variant!=false && $wgContLang->hasVariants()){
 888                                         if($wgVariantArticlePath==false)
 889                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 890                                         else
 891                                                 $variantArticlePath = $wgVariantArticlePath;
 892
 893                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 894                                         $url = str_replace( '$1', $dbkey, $url  );
 895
 896                                 }
 897                                 else
 898                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 899                         } else {
 900                                 global $wgActionPaths;
 901                                 $url = false;
 902                                 $matches = array();
 903                                 if( !empty( $wgActionPaths ) &&
 904                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 905                                 {
 906                                         $action = urldecode( $matches[2] );
 907                                         if( isset( $wgActionPaths[$action] ) ) {
 908                                                 $query = $matches[1];
 909                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 910                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 911                                                 if( $query != '' ) $url .= '?' . $query;
 912                                         }
 913                                 }
 914                                 if ( $url === false ) {
 915                                         if ( $query == '-' ) {
 916                                                 $query = '';
 917                                         }
 918                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 919                                 }
 920                         }
 921
 922                         // FIXME: this causes breakage in various places when we
 923                         // actually expected a local URL and end up with dupe prefixes.
 924                         if ($wgRequest->getVal('action') == 'render') {
 925                                 $url = $wgServer . $url;
 926                         }
 927                 }
 928                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 929                 return $url;
 930         }
 931
 932         /**
 933          * Get an HTML-escaped version of the URL form, suitable for
 934          * using in a link, without a server name or fragment
 935          * @param string $query an optional query string
 936          * @return string the URL
 937          * @access public
 938          */
 939         function escapeLocalURL( $query = '' ) {
 940                 return htmlspecialchars( $this->getLocalURL( $query ) );
 941         }
 942
 943         /**
 944          * Get an HTML-escaped version of the URL form, suitable for
 945          * using in a link, including the server name and fragment
 946          *
 947          * @return string the URL
 948          * @param string $query an optional query string
 949          * @access public
 950          */
 951         function escapeFullURL( $query = '' ) {
 952                 return htmlspecialchars( $this->getFullURL( $query ) );
 953         }
 954
 955         /**
 956          * Get the URL form for an internal link.
 957          * - Used in various Squid-related code, in case we have a different
 958          * internal hostname for the server from the exposed one.
 959          *
 960          * @param string $query an optional query string
 961          * @param string $variant language variant of url (for sr, zh..)
 962          * @return string the URL
 963          * @access public
 964          */
 965         function getInternalURL( $query = '', $variant = false ) {
 966                 global $wgInternalServer;
 967                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 968                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 969                 return $url;
 970         }
 971
 972         /**
 973          * Get the edit URL for this Title
 974          * @return string the URL, or a null string if this is an
 975          *      interwiki link
 976          * @access public
 977          */
 978         function getEditURL() {
 979                 if ( '' != $this->mInterwiki ) { return ''; }
 980                 $s = $this->getLocalURL( 'action=edit' );
 981
 982                 return $s;
 983         }
 984
 985         /**
 986          * Get the HTML-escaped displayable text form.
 987          * Used for the title field in <a> tags.
 988          * @return string the text, including any prefixes
 989          * @access public
 990          */
 991         function getEscapedText() {
 992                 return htmlspecialchars( $this->getPrefixedText() );
 993         }
 994
 995         /**
 996          * Is this Title interwiki?
 997          * @return boolean
 998          * @access public
 999          */
1000         function isExternal() { return ( '' != $this->mInterwiki ); }
1001
1002         /**
1003          * Is this page "semi-protected" - the *only* protection is autoconfirm?
1004          *
1005          * @param string Action to check (default: edit)
1006          * @return bool
1007          */
1008         function isSemiProtected( $action = 'edit' ) {
1009                 if( $this->exists() ) {
1010                         $restrictions = $this->getRestrictions( $action );
1011                         if( count( $restrictions ) > 0 ) {
1012                                 foreach( $restrictions as $restriction ) {
1013                                         if( strtolower( $restriction ) != 'autoconfirmed' )
1014                                                 return false;
1015                                 }
1016                         } else {
1017                                 # Not protected
1018                                 return false;
1019                         }
1020                         return true;
1021                 } else {
1022                         # If it doesn't exist, it can't be protected
1023                         return false;
1024                 }
1025         }
1026
1027         /**
1028          * Does the title correspond to a protected article?
1029          * @param string $what the action the page is protected from,
1030          *      by default checks move and edit
1031          * @return boolean
1032          * @access public
1033          */
1034         function isProtected( $action = '' ) {
1035                 global $wgRestrictionLevels;
1036
1037                 # Special pages have inherent protection
1038                 if( $this->getNamespace() == NS_SPECIAL )
1039                         return true;
1040
1041                 # Check regular protection levels
1042                 if( $action == 'edit' || $action == '' ) {
1043                         $r = $this->getRestrictions( 'edit' );
1044                         foreach( $wgRestrictionLevels as $level ) {
1045                                 if( in_array( $level, $r ) && $level != '' ) {
1046                                         return( true );
1047                                 }
1048                         }
1049                 }
1050
1051                 if( $action == 'move' || $action == '' ) {
1052                         $r = $this->getRestrictions( 'move' );
1053                         foreach( $wgRestrictionLevels as $level ) {
1054                                 if( in_array( $level, $r ) && $level != '' ) {
1055                                         return( true );
1056                                 }
1057                         }
1058                 }
1059
1060                 return false;
1061         }
1062
1063         /**
1064          * Is $wgUser is watching this page?
1065          * @return boolean
1066          * @access public
1067          */
1068         function userIsWatching() {
1069                 global $wgUser;
1070
1071                 if ( is_null( $this->mWatched ) ) {
1072                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1073                                 $this->mWatched = false;
1074                         } else {
1075                                 $this->mWatched = $wgUser->isWatched( $this );
1076                         }
1077                 }
1078                 return $this->mWatched;
1079         }
1080
1081         /**
1082          * Can $wgUser perform $action on this page?
1083          * This skips potentially expensive cascading permission checks.
1084          *
1085          * Suitable for use for nonessential UI controls in common cases, but
1086          * _not_ for functional access control.
1087          *
1088          * May provide false positives, but should never provide a false negative.
1089          *
1090          * @param string $action action that permission needs to be checked for
1091          * @return boolean
1092          */
1093         public function quickUserCan( $action ) {
1094                 return $this->userCan( $action, false );
1095         }
1096
1097         /**
1098          * Can $wgUser perform $action on this page?
1099          * @param string $action action that permission needs to be checked for
1100          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1101          * @return boolean
1102          */
1103         public function userCan( $action, $doExpensiveQueries = true ) {
1104                 $fname = 'Title::userCan';
1105                 wfProfileIn( $fname );
1106
1107                 global $wgUser, $wgNamespaceProtection;
1108
1109                 $result = null;
1110                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1111                 if ( $result !== null ) {
1112                         wfProfileOut( $fname );
1113                         return $result;
1114                 }
1115
1116                 if( NS_SPECIAL == $this->mNamespace ) {
1117                         wfProfileOut( $fname );
1118                         return false;
1119                 }
1120
1121                 if ( array_key_exists( $this->mNamespace, $wgNamespaceProtection ) ) {
1122                         $nsProt = $wgNamespaceProtection[ $this->mNamespace ];
1123                         if ( !is_array($nsProt) ) $nsProt = array($nsProt);
1124                         foreach( $nsProt as $right ) {
1125                                 if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1126                                         wfProfileOut( $fname );
1127                                         return false;
1128                                 }
1129                         }
1130                 }
1131
1132                 if( $this->mDbkeyform == '_' ) {
1133                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1134                         wfProfileOut( $fname );
1135                         return false;
1136                 }
1137
1138                 # protect css/js subpages of user pages
1139                 # XXX: this might be better using restrictions
1140                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1141                 if( $this->isCssJsSubpage()
1142                         && !$wgUser->isAllowed('editinterface')
1143                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1144                         wfProfileOut( $fname );
1145                         return false;
1146                 }
1147
1148                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1149                         # We /could/ use the protection level on the source page, but it's fairly ugly
1150                         #  as we have to establish a precedence hierarchy for pages included by multiple
1151                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1152                         #  as they could remove the protection anyway.
1153                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1154                         # Cascading protection depends on more than this page...
1155                         # Several cascading protected pages may include this page...
1156                         # Check each cascading level
1157                         # This is only for protection restrictions, not for all actions
1158                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1159                                 foreach( $restrictions[$action] as $right ) {
1160                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1161                                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1162                                                 wfProfileOut( $fname );
1163                                                 return false;
1164                                         }
1165                                 }
1166                         }
1167                 }
1168
1169                 foreach( $this->getRestrictions($action) as $right ) {
1170                         // Backwards compatibility, rewrite sysop -> protect
1171                         if ( $right == 'sysop' ) {
1172                                 $right = 'protect';
1173                         }
1174                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1175                                 wfProfileOut( $fname );
1176                                 return false;
1177                         }
1178                 }
1179
1180                 if( $action == 'move' &&
1181                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1182                         wfProfileOut( $fname );
1183                         return false;
1184                 }
1185
1186                 if( $action == 'create' ) {
1187                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1188                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1189                                 wfProfileOut( $fname );
1190                                 return false;
1191                         }
1192                 }
1193
1194                 wfProfileOut( $fname );
1195                 return true;
1196         }
1197
1198         /**
1199          * Can $wgUser edit this page?
1200          * @return boolean
1201          * @deprecated use userCan('edit')
1202          */
1203         public function userCanEdit( $doExpensiveQueries = true ) {
1204                 return $this->userCan( 'edit', $doExpensiveQueries );
1205         }
1206
1207         /**
1208          * Can $wgUser create this page?
1209          * @return boolean
1210          * @deprecated use userCan('create')
1211          */
1212         public function userCanCreate( $doExpensiveQueries = true ) {
1213                 return $this->userCan( 'create', $doExpensiveQueries );
1214         }
1215
1216         /**
1217          * Can $wgUser move this page?
1218          * @return boolean
1219          * @deprecated use userCan('move')
1220          */
1221         public function userCanMove( $doExpensiveQueries = true ) {
1222                 return $this->userCan( 'move', $doExpensiveQueries );
1223         }
1224
1225         /**
1226          * Would anybody with sufficient privileges be able to move this page?
1227          * Some pages just aren't movable.
1228          *
1229          * @return boolean
1230          * @access public
1231          */
1232         function isMovable() {
1233                 return Namespace::isMovable( $this->getNamespace() )
1234                         && $this->getInterwiki() == '';
1235         }
1236
1237         /**
1238          * Can $wgUser read this page?
1239          * @return boolean
1240          * @fixme fold these checks into userCan()
1241          */
1242         public function userCanRead() {
1243                 global $wgUser;
1244
1245                 $result = null;
1246                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1247                 if ( $result !== null ) {
1248                         return $result;
1249                 }
1250
1251                 if( $wgUser->isAllowed('read') ) {
1252                         return true;
1253                 } else {
1254                         global $wgWhitelistRead;
1255
1256                         /**
1257                          * Always grant access to the login page.
1258                          * Even anons need to be able to log in.
1259                         */
1260                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1261                                 return true;
1262                         }
1263
1264                         /** some pages are explicitly allowed */
1265                         $name = $this->getPrefixedText();
1266                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1267                                 return true;
1268                         }
1269
1270                         # Compatibility with old settings
1271                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1272                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1273                                         return true;
1274                                 }
1275                         }
1276                 }
1277                 return false;
1278         }
1279
1280         /**
1281          * Is this a talk page of some sort?
1282          * @return bool
1283          * @access public
1284          */
1285         function isTalkPage() {
1286                 return Namespace::isTalk( $this->getNamespace() );
1287         }
1288
1289         /**
1290          * Is this a subpage?
1291          * @return bool
1292          * @access public
1293          */
1294         function isSubpage() {
1295                 global $wgNamespacesWithSubpages;
1296
1297                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1298                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1299                 } else {
1300                         return false;
1301                 }
1302         }
1303
1304         /**
1305          * Is this a .css or .js subpage of a user page?
1306          * @return bool
1307          * @access public
1308          */
1309         function isCssJsSubpage() {
1310                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(css|js)$/", $this->mTextform ) );
1311         }
1312         /**
1313          * Is this a *valid* .css or .js subpage of a user page?
1314          * Check that the corresponding skin exists
1315          */
1316         function isValidCssJsSubpage() {
1317                 if ( $this->isCssJsSubpage() ) {
1318                         $skinNames = Skin::getSkinNames();
1319                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1320                 } else {
1321                         return false;
1322                 }
1323         }
1324         /**
1325          * Trim down a .css or .js subpage title to get the corresponding skin name
1326          */
1327         function getSkinFromCssJsSubpage() {
1328                 $subpage = explode( '/', $this->mTextform );
1329                 $subpage = $subpage[ count( $subpage ) - 1 ];
1330                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1331         }
1332         /**
1333          * Is this a .css subpage of a user page?
1334          * @return bool
1335          * @access public
1336          */
1337         function isCssSubpage() {
1338                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1339         }
1340         /**
1341          * Is this a .js subpage of a user page?
1342          * @return bool
1343          * @access public
1344          */
1345         function isJsSubpage() {
1346                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1347         }
1348         /**
1349          * Protect css/js subpages of user pages: can $wgUser edit
1350          * this page?
1351          *
1352          * @return boolean
1353          * @todo XXX: this might be better using restrictions
1354          * @access public
1355          */
1356         function userCanEditCssJsSubpage() {
1357                 global $wgUser;
1358                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1359         }
1360
1361         /**
1362          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1363          *
1364          * @return bool If the page is subject to cascading restrictions.
1365          * @access public.
1366          */
1367         function isCascadeProtected() {
1368                 list( $sources, $restrictions ) = $this->getCascadeProtectionSources( false );
1369                 return ( $sources > 0 );
1370         }
1371
1372         /**
1373          * Cascading protection: Get the source of any cascading restrictions on this page.
1374          *
1375          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1376          * @return array( mixed title array, restriction array)
1377          * 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.
1378          * The restriction array is an array of each type, each of which contains an array of unique groups
1379          * @access public
1380          */
1381         function getCascadeProtectionSources( $get_pages = true ) {
1382                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1383
1384                 # Define our dimension of restrictions types
1385                 $pagerestrictions = array();
1386                 foreach( $wgRestrictionTypes as $action )
1387                         $pagerestrictions[$action] = array();
1388
1389                 if (!$wgEnableCascadingProtection)
1390                         return array( false, $pagerestrictions );
1391
1392                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1393                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1394                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1395                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1396                 }
1397
1398                 wfProfileIn( __METHOD__ );
1399
1400                 $dbr = wfGetDb( DB_SLAVE );
1401
1402                 if ( $this->getNamespace() == NS_IMAGE ) {
1403                         $tables = array ('imagelinks', 'page_restrictions');
1404                         $where_clauses = array(
1405                                 'il_to' => $this->getDBkey(),
1406                                 'il_from=pr_page',
1407                                 'pr_cascade' => 1 );
1408                 } else {
1409                         $tables = array ('templatelinks', 'page_restrictions');
1410                         $where_clauses = array(
1411                                 'tl_namespace' => $this->getNamespace(),
1412                                 'tl_title' => $this->getDBkey(),
1413                                 'tl_from=pr_page',
1414                                 'pr_cascade' => 1 );
1415                 }
1416
1417                 if ( $get_pages ) {
1418                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1419                         $where_clauses[] = 'page_id=pr_page';
1420                         $tables[] = 'page';
1421                 } else {
1422                         $cols = array( 'pr_expiry' );
1423                 }
1424
1425                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1426
1427                 $sources = $get_pages ? array() : false;
1428                 $now = wfTimestampNow();
1429                 $purgeExpired = false;
1430
1431                 while( $row = $dbr->fetchObject( $res ) ) {
1432                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1433                         if( $expiry > $now ) {
1434                                 if ($get_pages) {
1435                                         $page_id = $row->pr_page;
1436                                         $page_ns = $row->page_namespace;
1437                                         $page_title = $row->page_title;
1438                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1439                                         # Add groups needed for each restriction type if its not already there
1440                                         # Make sure this restriction type still exists
1441                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1442                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1443                                         }
1444                                 } else {
1445                                         $sources = true;
1446                                 }
1447                         } else {
1448                                 // Trigger lazy purge of expired restrictions from the db
1449                                 $purgeExpired = true;
1450                         }
1451                 }
1452                 if( $purgeExpired ) {
1453                         Title::purgeExpiredRestrictions();
1454                 }
1455
1456                 wfProfileOut( __METHOD__ );
1457
1458                 if ( $get_pages ) {
1459                         $this->mCascadeSources = $sources;
1460                         $this->mCascadingRestrictions = $pagerestrictions;
1461                 } else {
1462                         $this->mHasCascadingRestrictions = $sources;
1463                 }
1464
1465                 return array( $sources, $pagerestrictions );
1466         }
1467
1468         function areRestrictionsCascading() {
1469                 if (!$this->mRestrictionsLoaded) {
1470                         $this->loadRestrictions();
1471                 }
1472
1473                 return $this->mCascadeRestriction;
1474         }
1475
1476         /**
1477          * Loads a string into mRestrictions array
1478          * @param resource $res restrictions as an SQL result.
1479          * @access public
1480          */
1481         function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1482                 $dbr = wfGetDb( DB_SLAVE );
1483
1484                 $this->mRestrictions['edit'] = array();
1485                 $this->mRestrictions['move'] = array();
1486
1487                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1488
1489                 if ( $oldFashionedRestrictions == NULL ) {
1490                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1491                 }
1492
1493                 if ($oldFashionedRestrictions != '') {
1494
1495                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1496                                 $temp = explode( '=', trim( $restrict ) );
1497                                 if(count($temp) == 1) {
1498                                         // old old format should be treated as edit/move restriction
1499                                         $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1500                                         $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1501                                 } else {
1502                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1503                                 }
1504                         }
1505
1506                         $this->mOldRestrictions = true;
1507                         $this->mCascadeRestriction = false;
1508                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1509
1510                 }
1511
1512                 if( $dbr->numRows( $res ) ) {
1513                         # Current system - load second to make them override.
1514                         $now = wfTimestampNow();
1515                         $purgeExpired = false;
1516
1517                         while ($row = $dbr->fetchObject( $res ) ) {
1518                                 # Cycle through all the restrictions.
1519
1520                                 // This code should be refactored, now that it's being used more generally,
1521                                 // But I don't really see any harm in leaving it in Block for now -werdna
1522                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1523
1524                                 // Only apply the restrictions if they haven't expired!
1525                                 if ( !$expiry || $expiry > $now ) {
1526                                         $this->mRestrictionsExpiry = $expiry;
1527                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1528
1529                                         $this->mCascadeRestriction |= $row->pr_cascade;
1530                                 } else {
1531                                         // Trigger a lazy purge of expired restrictions
1532                                         $purgeExpired = true;
1533                                 }
1534                         }
1535
1536                         if( $purgeExpired ) {
1537                                 Title::purgeExpiredRestrictions();
1538                         }
1539                 }
1540
1541                 $this->mRestrictionsLoaded = true;
1542         }
1543
1544         function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1545                 if( !$this->mRestrictionsLoaded ) {
1546                         $dbr = wfGetDB( DB_SLAVE );
1547
1548                         $res = $dbr->select( 'page_restrictions', '*',
1549                                 array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1550
1551                         $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1552                 }
1553         }
1554
1555         /**
1556          * Purge expired restrictions from the page_restrictions table
1557          */
1558         static function purgeExpiredRestrictions() {
1559                 $dbw = wfGetDB( DB_MASTER );
1560                 $dbw->delete( 'page_restrictions',
1561                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1562                         __METHOD__ );
1563         }
1564
1565         /**
1566          * Accessor/initialisation for mRestrictions
1567          *
1568          * @access public
1569          * @param string $action action that permission needs to be checked for
1570          * @return array the array of groups allowed to edit this article
1571          */
1572         function getRestrictions( $action ) {
1573                 if( $this->exists() ) {
1574                         if( !$this->mRestrictionsLoaded ) {
1575                                 $this->loadRestrictions();
1576                         }
1577                         return isset( $this->mRestrictions[$action] )
1578                                         ? $this->mRestrictions[$action]
1579                                         : array();
1580                 } else {
1581                         return array();
1582                 }
1583         }
1584
1585         /**
1586          * Is there a version of this page in the deletion archive?
1587          * @return int the number of archived revisions
1588          * @access public
1589          */
1590         function isDeleted() {
1591                 $fname = 'Title::isDeleted';
1592                 if ( $this->getNamespace() < 0 ) {
1593                         $n = 0;
1594                 } else {
1595                         $dbr = wfGetDB( DB_SLAVE );
1596                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1597                                 'ar_title' => $this->getDBkey() ), $fname );
1598                         if( $this->getNamespace() == NS_IMAGE ) {
1599                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1600                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1601                         }
1602                 }
1603                 return (int)$n;
1604         }
1605
1606         /**
1607          * Get the article ID for this Title from the link cache,
1608          * adding it if necessary
1609          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1610          *      for update
1611          * @return int the ID
1612          */
1613         public function getArticleID( $flags = 0 ) {
1614                 $linkCache =& LinkCache::singleton();
1615                 if ( $flags & GAID_FOR_UPDATE ) {
1616                         $oldUpdate = $linkCache->forUpdate( true );
1617                         $this->mArticleID = $linkCache->addLinkObj( $this );
1618                         $linkCache->forUpdate( $oldUpdate );
1619                 } else {
1620                         if ( -1 == $this->mArticleID ) {
1621                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1622                         }
1623                 }
1624                 return $this->mArticleID;
1625         }
1626
1627         function getLatestRevID() {
1628                 if ($this->mLatestID !== false)
1629                         return $this->mLatestID;
1630
1631                 $db = wfGetDB(DB_SLAVE);
1632                 return $this->mLatestID = $db->selectField( 'revision',
1633                         "max(rev_id)",
1634                         array('rev_page' => $this->getArticleID()),
1635                         'Title::getLatestRevID' );
1636         }
1637
1638         /**
1639          * This clears some fields in this object, and clears any associated
1640          * keys in the "bad links" section of the link cache.
1641          *
1642          * - This is called from Article::insertNewArticle() to allow
1643          * loading of the new page_id. It's also called from
1644          * Article::doDeleteArticle()
1645          *
1646          * @param int $newid the new Article ID
1647          * @access public
1648          */
1649         function resetArticleID( $newid ) {
1650                 $linkCache =& LinkCache::singleton();
1651                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1652
1653                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1654                 else { $this->mArticleID = $newid; }
1655                 $this->mRestrictionsLoaded = false;
1656                 $this->mRestrictions = array();
1657         }
1658
1659         /**
1660          * Updates page_touched for this page; called from LinksUpdate.php
1661          * @return bool true if the update succeded
1662          * @access public
1663          */
1664         function invalidateCache() {
1665                 global $wgUseFileCache;
1666
1667                 if ( wfReadOnly() ) {
1668                         return;
1669                 }
1670
1671                 $dbw = wfGetDB( DB_MASTER );
1672                 $success = $dbw->update( 'page',
1673                         array( /* SET */
1674                                 'page_touched' => $dbw->timestamp()
1675                         ), array( /* WHERE */
1676                                 'page_namespace' => $this->getNamespace() ,
1677                                 'page_title' => $this->getDBkey()
1678                         ), 'Title::invalidateCache'
1679                 );
1680
1681                 if ($wgUseFileCache) {
1682                         $cache = new HTMLFileCache($this);
1683                         @unlink($cache->fileCacheName());
1684                 }
1685
1686                 return $success;
1687         }
1688
1689         /**
1690          * Prefix some arbitrary text with the namespace or interwiki prefix
1691          * of this object
1692          *
1693          * @param string $name the text
1694          * @return string the prefixed text
1695          * @private
1696          */
1697         /* private */ function prefix( $name ) {
1698                 $p = '';
1699                 if ( '' != $this->mInterwiki ) {
1700                         $p = $this->mInterwiki . ':';
1701                 }
1702                 if ( 0 != $this->mNamespace ) {
1703                         $p .= $this->getNsText() . ':';
1704                 }
1705                 return $p . $name;
1706         }
1707
1708         /**
1709          * Secure and split - main initialisation function for this object
1710          *
1711          * Assumes that mDbkeyform has been set, and is urldecoded
1712          * and uses underscores, but not otherwise munged.  This function
1713          * removes illegal characters, splits off the interwiki and
1714          * namespace prefixes, sets the other forms, and canonicalizes
1715          * everything.
1716          * @param bool $isvalid, allows for multiple colons and characters set as illegal
1717          * @return bool true on success
1718          * @private
1719          */
1720         /* private */ function secureAndSplit( $isvalid=true ) {
1721                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1722
1723                 # Initialisation
1724                 static $rxTc = false;
1725                 if( !$rxTc ) {
1726                         # % is needed as well
1727                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1728                 }
1729
1730                 $this->mInterwiki = $this->mFragment = '';
1731                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1732
1733                 $dbkey = $this->mDbkeyform;
1734
1735                 # Strip Unicode bidi override characters.
1736                 # Sometimes they slip into cut-n-pasted page titles, where the
1737                 # override chars get included in list displays.
1738                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1739                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1740
1741                 # Clean up whitespace
1742                 #
1743                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1744                 $dbkey = trim( $dbkey, '_' );
1745
1746                 if ( '' == $dbkey ) {
1747                         return false;
1748                 }
1749
1750                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1751                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1752                         return false;
1753                 }
1754
1755                 $this->mDbkeyform = $dbkey;
1756
1757                 # Initial colon indicates main namespace rather than specified default
1758                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1759                 if ( ':' == $dbkey{0} ) {
1760                         $this->mNamespace = NS_MAIN;
1761                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1762                 }
1763
1764                 # Namespace or interwiki prefix
1765                 $firstPass = true;
1766                 do {
1767                         $m = array();
1768                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1769                                 $p = $m[1];
1770                                 $lowerNs = $wgContLang->lc( $p );
1771                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1772                                         # Canonical namespace
1773                                         $dbkey = $m[2];
1774                                         $this->mNamespace = $ns;
1775                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1776                                         # Ordinary namespace
1777                                         $dbkey = $m[2];
1778                                         $this->mNamespace = $ns;
1779                                 } elseif( $this->getInterwikiLink( $p ) ) {
1780                                         if( !$firstPass ) {
1781                                                 # Can't make a local interwiki link to an interwiki link.
1782                                                 # That's just crazy!
1783                                                 return false;
1784                                         }
1785
1786                                         # Interwiki link
1787                                         $dbkey = $m[2];
1788                                         $this->mInterwiki = $wgContLang->lc( $p );
1789
1790                                         # Redundant interwiki prefix to the local wiki
1791                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1792                                                 if( $dbkey == '' ) {
1793                                                         # Can't have an empty self-link
1794                                                         return false;
1795                                                 }
1796                                                 $this->mInterwiki = '';
1797                                                 $firstPass = false;
1798                                                 # Do another namespace split...
1799                                                 continue;
1800                                         }
1801
1802                                         # If there's an initial colon after the interwiki, that also
1803                                         # resets the default namespace
1804                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1805                                                 $this->mNamespace = NS_MAIN;
1806                                                 $dbkey = substr( $dbkey, 1 );
1807                                         }
1808                                 }
1809                                 # If there's no recognized interwiki or namespace,
1810                                 # then let the colon expression be part of the title.
1811                         }
1812                         break;
1813                 } while( true );
1814
1815                 # We already know that some pages won't be in the database!
1816                 #
1817                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1818                         $this->mArticleID = 0;
1819                 }
1820                 $fragment = strstr( $dbkey, '#' );
1821                 if ( $isvalid && false !== $fragment ) {
1822                         $this->setFragment( $fragment );
1823                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1824                         # remove whitespace again: prevents "Foo_bar_#"
1825                         # becoming "Foo_bar_"
1826                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1827                 }
1828
1829                 # Reject illegal characters.
1830                 #
1831                 if( $isvalid && preg_match( $rxTc, $dbkey ) ) {
1832                         return false;
1833                 }
1834
1835                 /**
1836                  * Pages with "/./" or "/../" appearing in the URLs will
1837                  * often be unreachable due to the way web browsers deal
1838                  * with 'relative' URLs. Forbid them explicitly.
1839                  */
1840                 if ( strpos( $dbkey, '.' ) !== false &&
1841                      ( $dbkey === '.' || $dbkey === '..' ||
1842                        strpos( $dbkey, './' ) === 0  ||
1843                        strpos( $dbkey, '../' ) === 0 ||
1844                        strpos( $dbkey, '/./' ) !== false ||
1845                        strpos( $dbkey, '/../' ) !== false ) )
1846                 {
1847                         return false;
1848                 }
1849
1850                 /**
1851                  * Magic tilde sequences? Nu-uh!
1852                  */
1853                 if( strpos( $dbkey, '~~~' ) !== false ) {
1854                         return false;
1855                 }
1856
1857                 /**
1858                  * Limit the size of titles to 255 bytes.
1859                  * This is typically the size of the underlying database field.
1860                  * We make an exception for special pages, which don't need to be stored
1861                  * in the database, and may edge over 255 bytes due to subpage syntax
1862                  * for long titles, e.g. [[Special:Block/Long name]]
1863                  */
1864                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1865                   strlen( $dbkey ) > 512 )
1866                 {
1867                         return false;
1868                 }
1869
1870                 /**
1871                  * Normally, all wiki links are forced to have
1872                  * an initial capital letter so [[foo]] and [[Foo]]
1873                  * point to the same place.
1874                  *
1875                  * Don't force it for interwikis, since the other
1876                  * site might be case-sensitive.
1877                  */
1878                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1879                         $dbkey = $wgContLang->ucfirst( $dbkey );
1880                 }
1881
1882                 /**
1883                  * Can't make a link to a namespace alone...
1884                  * "empty" local links can only be self-links
1885                  * with a fragment identifier.
1886                  */
1887                 if( $dbkey == '' &&
1888                         $this->mInterwiki == '' &&
1889                         $this->mNamespace != NS_MAIN ) {
1890                         return false;
1891                 }
1892
1893                 // Any remaining initial :s are illegal.
1894                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1895                         return false;
1896                 }
1897
1898                 # Fill fields
1899                 $this->mDbkeyform = $dbkey;
1900                 $this->mUrlform = wfUrlencode( $dbkey );
1901
1902                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1903
1904                 return true;
1905         }
1906
1907         /**
1908          * Set the fragment for this title
1909          * This is kind of bad, since except for this rarely-used function, Title objects
1910          * are immutable. The reason this is here is because it's better than setting the
1911          * members directly, which is what Linker::formatComment was doing previously.
1912          *
1913          * @param string $fragment text
1914          * @access kind of public
1915          */
1916         function setFragment( $fragment ) {
1917                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1918         }
1919
1920         /**
1921          * Get a Title object associated with the talk page of this article
1922          * @return Title the object for the talk page
1923          * @access public
1924          */
1925         function getTalkPage() {
1926                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1927         }
1928
1929         /**
1930          * Get a title object associated with the subject page of this
1931          * talk page
1932          *
1933          * @return Title the object for the subject page
1934          * @access public
1935          */
1936         function getSubjectPage() {
1937                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1938         }
1939
1940         /**
1941          * Get an array of Title objects linking to this Title
1942          * Also stores the IDs in the link cache.
1943          *
1944          * WARNING: do not use this function on arbitrary user-supplied titles!
1945          * On heavily-used templates it will max out the memory.
1946          *
1947          * @param string $options may be FOR UPDATE
1948          * @return array the Title objects linking here
1949          * @access public
1950          */
1951         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1952                 $linkCache =& LinkCache::singleton();
1953
1954                 if ( $options ) {
1955                         $db = wfGetDB( DB_MASTER );
1956                 } else {
1957                         $db = wfGetDB( DB_SLAVE );
1958                 }
1959
1960                 $res = $db->select( array( 'page', $table ),
1961                         array( 'page_namespace', 'page_title', 'page_id' ),
1962                         array(
1963                                 "{$prefix}_from=page_id",
1964                                 "{$prefix}_namespace" => $this->getNamespace(),
1965                                 "{$prefix}_title"     => $this->getDbKey() ),
1966                         'Title::getLinksTo',
1967                         $options );
1968
1969                 $retVal = array();
1970                 if ( $db->numRows( $res ) ) {
1971                         while ( $row = $db->fetchObject( $res ) ) {
1972                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1973                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1974                                         $retVal[] = $titleObj;
1975                                 }
1976                         }
1977                 }
1978                 $db->freeResult( $res );
1979                 return $retVal;
1980         }
1981
1982         /**
1983          * Get an array of Title objects using this Title as a template
1984          * Also stores the IDs in the link cache.
1985          *
1986          * WARNING: do not use this function on arbitrary user-supplied titles!
1987          * On heavily-used templates it will max out the memory.
1988          *
1989          * @param string $options may be FOR UPDATE
1990          * @return array the Title objects linking here
1991          * @access public
1992          */
1993         function getTemplateLinksTo( $options = '' ) {
1994                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1995         }
1996
1997         /**
1998          * Get an array of Title objects referring to non-existent articles linked from this page
1999          *
2000          * @param string $options may be FOR UPDATE
2001          * @return array the Title objects
2002          * @access public
2003          */
2004         function getBrokenLinksFrom( $options = '' ) {
2005                 if ( $options ) {
2006                         $db = wfGetDB( DB_MASTER );
2007                 } else {
2008                         $db = wfGetDB( DB_SLAVE );
2009                 }
2010
2011                 $res = $db->safeQuery(
2012                           "SELECT pl_namespace, pl_title
2013                              FROM !
2014                         LEFT JOIN !
2015                                ON pl_namespace=page_namespace
2016                               AND pl_title=page_title
2017                             WHERE pl_from=?
2018                               AND page_namespace IS NULL
2019                                   !",
2020                         $db->tableName( 'pagelinks' ),
2021                         $db->tableName( 'page' ),
2022                         $this->getArticleId(),
2023                         $options );
2024
2025                 $retVal = array();
2026                 if ( $db->numRows( $res ) ) {
2027                         while ( $row = $db->fetchObject( $res ) ) {
2028                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2029                         }
2030                 }
2031                 $db->freeResult( $res );
2032                 return $retVal;
2033         }
2034
2035
2036         /**
2037          * Get a list of URLs to purge from the Squid cache when this
2038          * page changes
2039          *
2040          * @return array the URLs
2041          * @access public
2042          */
2043         function getSquidURLs() {
2044                 global $wgContLang;
2045
2046                 $urls = array(
2047                         $this->getInternalURL(),
2048                         $this->getInternalURL( 'action=history' )
2049                 );
2050
2051                 // purge variant urls as well
2052                 if($wgContLang->hasVariants()){
2053                         $variants = $wgContLang->getVariants();
2054                         foreach($variants as $vCode){
2055                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2056                                 $urls[] = $this->getInternalURL('',$vCode);
2057                         }
2058                 }
2059
2060                 return $urls;
2061         }
2062
2063         function purgeSquid() {
2064                 global $wgUseSquid;
2065                 if ( $wgUseSquid ) {
2066                         $urls = $this->getSquidURLs();
2067                         $u = new SquidUpdate( $urls );
2068                         $u->doUpdate();
2069                 }
2070         }
2071
2072         /**
2073          * Move this page without authentication
2074          * @param Title &$nt the new page Title
2075          * @access public
2076          */
2077         function moveNoAuth( &$nt ) {
2078                 return $this->moveTo( $nt, false );
2079         }
2080
2081         /**
2082          * Check whether a given move operation would be valid.
2083          * Returns true if ok, or a message key string for an error message
2084          * if invalid. (Scarrrrry ugly interface this.)
2085          * @param Title &$nt the new title
2086          * @param bool $auth indicates whether $wgUser's permissions
2087          *      should be checked
2088          * @return mixed true on success, message name on failure
2089          * @access public
2090          */
2091         function isValidMoveOperation( &$nt, $auth = true ) {
2092                 if( !$this or !$nt ) {
2093                         return 'badtitletext';
2094                 }
2095                 if( $this->equals( $nt ) ) {
2096                         return 'selfmove';
2097                 }
2098                 if( !$this->isMovable() || !$nt->isMovable() ) {
2099                         return 'immobile_namespace';
2100                 }
2101
2102                 $oldid = $this->getArticleID();
2103                 $newid = $nt->getArticleID();
2104
2105                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2106                         return 'articleexists';
2107                 }
2108                 if ( ( '' == $this->getDBkey() ) ||
2109                          ( !$oldid ) ||
2110                      ( '' == $nt->getDBkey() ) ) {
2111                         return 'badarticleerror';
2112                 }
2113
2114                 if ( $auth && (
2115                                 !$this->userCan( 'edit' ) || !$nt->userCan( 'edit' ) ||
2116                                 !$this->userCan( 'move' ) || !$nt->userCan( 'move' ) ) ) {
2117                         return 'protectedpage';
2118                 }
2119
2120                 # The move is allowed only if (1) the target doesn't exist, or
2121                 # (2) the target is a redirect to the source, and has no history
2122                 # (so we can undo bad moves right after they're done).
2123
2124                 if ( 0 != $newid ) { # Target exists; check for validity
2125                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2126                                 return 'articleexists';
2127                         }
2128                 }
2129                 return true;
2130         }
2131
2132         /**
2133          * Move a title to a new location
2134          * @param Title &$nt the new title
2135          * @param bool $auth indicates whether $wgUser's permissions
2136          *      should be checked
2137          * @return mixed true on success, message name on failure
2138          * @access public
2139          */
2140         function moveTo( &$nt, $auth = true, $reason = '' ) {
2141                 $err = $this->isValidMoveOperation( $nt, $auth );
2142                 if( is_string( $err ) ) {
2143                         return $err;
2144                 }
2145
2146                 $pageid = $this->getArticleID();
2147                 if( $nt->exists() ) {
2148                         $this->moveOverExistingRedirect( $nt, $reason );
2149                         $pageCountChange = 0;
2150                 } else { # Target didn't exist, do normal move.
2151                         $this->moveToNewTitle( $nt, $reason );
2152                         $pageCountChange = 1;
2153                 }
2154                 $redirid = $this->getArticleID();
2155
2156                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
2157                 $dbw = wfGetDB( DB_MASTER );
2158                 $categorylinks = $dbw->tableName( 'categorylinks' );
2159                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
2160                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
2161                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
2162                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
2163
2164                 # Update watchlists
2165
2166                 $oldnamespace = $this->getNamespace() & ~1;
2167                 $newnamespace = $nt->getNamespace() & ~1;
2168                 $oldtitle = $this->getDBkey();
2169                 $newtitle = $nt->getDBkey();
2170
2171                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2172                         WatchedItem::duplicateEntries( $this, $nt );
2173                 }
2174
2175                 # Update search engine
2176                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2177                 $u->doUpdate();
2178                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2179                 $u->doUpdate();
2180
2181                 # Update site_stats
2182                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2183                         # No longer a content page
2184                         # Not viewed, edited, removing
2185                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2186                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2187                         # Now a content page
2188                         # Not viewed, edited, adding
2189                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2190                 } elseif( $pageCountChange ) {
2191                         # Redirect added
2192                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2193                 } else {
2194                         # Nothing special
2195                         $u = false;
2196                 }
2197                 if( $u )
2198                         $u->doUpdate();
2199
2200                 global $wgUser;
2201                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2202                 return true;
2203         }
2204
2205         /**
2206          * Move page to a title which is at present a redirect to the
2207          * source page
2208          *
2209          * @param Title &$nt the page to move to, which should currently
2210          *      be a redirect
2211          * @private
2212          */
2213         function moveOverExistingRedirect( &$nt, $reason = '' ) {
2214                 global $wgUseSquid;
2215                 $fname = 'Title::moveOverExistingRedirect';
2216                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2217
2218                 if ( $reason ) {
2219                         $comment .= ": $reason";
2220                 }
2221
2222                 $now = wfTimestampNow();
2223                 $newid = $nt->getArticleID();
2224                 $oldid = $this->getArticleID();
2225                 $dbw = wfGetDB( DB_MASTER );
2226                 $linkCache =& LinkCache::singleton();
2227
2228                 # Delete the old redirect. We don't save it to history since
2229                 # by definition if we've got here it's rather uninteresting.
2230                 # We have to remove it so that the next step doesn't trigger
2231                 # a conflict on the unique namespace+title index...
2232                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2233
2234                 # Save a null revision in the page's history notifying of the move
2235                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2236                 $nullRevId = $nullRevision->insertOn( $dbw );
2237
2238                 # Change the name of the target page:
2239                 $dbw->update( 'page',
2240                         /* SET */ array(
2241                                 'page_touched'   => $dbw->timestamp($now),
2242                                 'page_namespace' => $nt->getNamespace(),
2243                                 'page_title'     => $nt->getDBkey(),
2244                                 'page_latest'    => $nullRevId,
2245                         ),
2246                         /* WHERE */ array( 'page_id' => $oldid ),
2247                         $fname
2248                 );
2249                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2250
2251                 # Recreate the redirect, this time in the other direction.
2252                 $mwRedir = MagicWord::get( 'redirect' );
2253                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2254                 $redirectArticle = new Article( $this );
2255                 $newid = $redirectArticle->insertOn( $dbw );
2256                 $redirectRevision = new Revision( array(
2257                         'page'    => $newid,
2258                         'comment' => $comment,
2259                         'text'    => $redirectText ) );
2260                 $redirectRevision->insertOn( $dbw );
2261                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2262                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2263
2264                 # Log the move
2265                 $log = new LogPage( 'move' );
2266                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2267
2268                 # Now, we record the link from the redirect to the new title.
2269                 # It should have no other outgoing links...
2270                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2271                 $dbw->insert( 'pagelinks',
2272                         array(
2273                                 'pl_from'      => $newid,
2274                                 'pl_namespace' => $nt->getNamespace(),
2275                                 'pl_title'     => $nt->getDbKey() ),
2276                         $fname );
2277
2278                 # Purge squid
2279                 if ( $wgUseSquid ) {
2280                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2281                         $u = new SquidUpdate( $urls );
2282                         $u->doUpdate();
2283                 }
2284         }
2285
2286         /**
2287          * Move page to non-existing title.
2288          * @param Title &$nt the new Title
2289          * @private
2290          */
2291         function moveToNewTitle( &$nt, $reason = '' ) {
2292                 global $wgUseSquid;
2293                 $fname = 'MovePageForm::moveToNewTitle';
2294                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2295                 if ( $reason ) {
2296                         $comment .= ": $reason";
2297                 }
2298
2299                 $newid = $nt->getArticleID();
2300                 $oldid = $this->getArticleID();
2301                 $dbw = wfGetDB( DB_MASTER );
2302                 $now = $dbw->timestamp();
2303                 $linkCache =& LinkCache::singleton();
2304
2305                 # Save a null revision in the page's history notifying of the move
2306                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2307                 $nullRevId = $nullRevision->insertOn( $dbw );
2308
2309                 # Rename cur entry
2310                 $dbw->update( 'page',
2311                         /* SET */ array(
2312                                 'page_touched'   => $now,
2313                                 'page_namespace' => $nt->getNamespace(),
2314                                 'page_title'     => $nt->getDBkey(),
2315                                 'page_latest'    => $nullRevId,
2316                         ),
2317                         /* WHERE */ array( 'page_id' => $oldid ),
2318                         $fname
2319                 );
2320
2321                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2322
2323                 # Insert redirect
2324                 $mwRedir = MagicWord::get( 'redirect' );
2325                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2326                 $redirectArticle = new Article( $this );
2327                 $newid = $redirectArticle->insertOn( $dbw );
2328                 $redirectRevision = new Revision( array(
2329                         'page'    => $newid,
2330                         'comment' => $comment,
2331                         'text'    => $redirectText ) );
2332                 $redirectRevision->insertOn( $dbw );
2333                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2334                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2335
2336                 # Log the move
2337                 $log = new LogPage( 'move' );
2338                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2339
2340                 # Purge caches as per article creation
2341                 Article::onArticleCreate( $nt );
2342
2343                 # Record the just-created redirect's linking to the page
2344                 $dbw->insert( 'pagelinks',
2345                         array(
2346                                 'pl_from'      => $newid,
2347                                 'pl_namespace' => $nt->getNamespace(),
2348                                 'pl_title'     => $nt->getDBkey() ),
2349                         $fname );
2350
2351                 # Purge old title from squid
2352                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2353                 $this->purgeSquid();
2354         }
2355
2356         /**
2357          * Checks if $this can be moved to a given Title
2358          * - Selects for update, so don't call it unless you mean business
2359          *
2360          * @param Title &$nt the new title to check
2361          * @access public
2362          */
2363         function isValidMoveTarget( $nt ) {
2364
2365                 $fname = 'Title::isValidMoveTarget';
2366                 $dbw = wfGetDB( DB_MASTER );
2367
2368                 # Is it a redirect?
2369                 $id  = $nt->getArticleID();
2370                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2371                         array( 'page_is_redirect','old_text','old_flags' ),
2372                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2373                         $fname, 'FOR UPDATE' );
2374
2375                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2376                         # Not a redirect
2377                         wfDebug( __METHOD__ . ": not a redirect\n" );
2378                         return false;
2379                 }
2380                 $text = Revision::getRevisionText( $obj );
2381
2382                 # Does the redirect point to the source?
2383                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2384                 $m = array();
2385                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2386                         $redirTitle = Title::newFromText( $m[1] );
2387                         if( !is_object( $redirTitle ) ||
2388                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2389                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2390                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2391                                 return false;
2392                         }
2393                 } else {
2394                         # Fail safe
2395                         wfDebug( __METHOD__ . ": failsafe\n" );
2396                         return false;
2397                 }
2398
2399                 # Does the article have a history?
2400                 $row = $dbw->selectRow( array( 'page', 'revision'),
2401                         array( 'rev_id' ),
2402                         array( 'page_namespace' => $nt->getNamespace(),
2403                                 'page_title' => $nt->getDBkey(),
2404                                 'page_id=rev_page AND page_latest != rev_id'
2405                         ), $fname, 'FOR UPDATE'
2406                 );
2407
2408                 # Return true if there was no history
2409                 return $row === false;
2410         }
2411
2412         /**
2413          * Get categories to which this Title belongs and return an array of
2414          * categories' names.
2415          *
2416          * @return array an array of parents in the form:
2417          *      $parent => $currentarticle
2418          * @access public
2419          */
2420         function getParentCategories() {
2421                 global $wgContLang;
2422
2423                 $titlekey = $this->getArticleId();
2424                 $dbr = wfGetDB( DB_SLAVE );
2425                 $categorylinks = $dbr->tableName( 'categorylinks' );
2426
2427                 # NEW SQL
2428                 $sql = "SELECT * FROM $categorylinks"
2429                      ." WHERE cl_from='$titlekey'"
2430                          ." AND cl_from <> '0'"
2431                          ." ORDER BY cl_sortkey";
2432
2433                 $res = $dbr->query ( $sql ) ;
2434
2435                 if($dbr->numRows($res) > 0) {
2436                         while ( $x = $dbr->fetchObject ( $res ) )
2437                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2438                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2439                         $dbr->freeResult ( $res ) ;
2440                 } else {
2441                         $data = '';
2442                 }
2443                 return $data;
2444         }
2445
2446         /**
2447          * Get a tree of parent categories
2448          * @param array $children an array with the children in the keys, to check for circular refs
2449          * @return array
2450          * @access public
2451          */
2452         function getParentCategoryTree( $children = array() ) {
2453                 $parents = $this->getParentCategories();
2454
2455                 if($parents != '') {
2456                         foreach($parents as $parent => $current) {
2457                                 if ( array_key_exists( $parent, $children ) ) {
2458                                         # Circular reference
2459                                         $stack[$parent] = array();
2460                                 } else {
2461                                         $nt = Title::newFromText($parent);
2462                                         if ( $nt ) {
2463                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2464                                         }
2465                                 }
2466                         }
2467                         return $stack;
2468                 } else {
2469                         return array();
2470                 }
2471         }
2472
2473
2474         /**
2475          * Get an associative array for selecting this title from
2476          * the "page" table
2477          *
2478          * @return array
2479          * @access public
2480          */
2481         function pageCond() {
2482                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2483         }
2484
2485         /**
2486          * Get the revision ID of the previous revision
2487          *
2488          * @param integer $revision  Revision ID. Get the revision that was before this one.
2489          * @return integer $oldrevision|false
2490          */
2491         function getPreviousRevisionID( $revision ) {
2492                 $dbr = wfGetDB( DB_SLAVE );
2493                 return $dbr->selectField( 'revision', 'rev_id',
2494                         'rev_page=' . intval( $this->getArticleId() ) .
2495                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2496         }
2497
2498         /**
2499          * Get the revision ID of the next revision
2500          *
2501          * @param integer $revision  Revision ID. Get the revision that was after this one.
2502          * @return integer $oldrevision|false
2503          */
2504         function getNextRevisionID( $revision ) {
2505                 $dbr = wfGetDB( DB_SLAVE );
2506                 return $dbr->selectField( 'revision', 'rev_id',
2507                         'rev_page=' . intval( $this->getArticleId() ) .
2508                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2509         }
2510
2511         /**
2512          * Get the number of revisions between the given revision IDs.
2513          *
2514          * @param integer $old  Revision ID.
2515          * @param integer $new  Revision ID.
2516          * @return integer  Number of revisions between these IDs.
2517          */
2518         function countRevisionsBetween( $old, $new ) {
2519                 $dbr = wfGetDB( DB_SLAVE );
2520                 return $dbr->selectField( 'revision', 'count(*)',
2521                         'rev_page = ' . intval( $this->getArticleId() ) .
2522                         ' AND rev_id > ' . intval( $old ) .
2523                         ' AND rev_id < ' . intval( $new ) );
2524         }
2525
2526         /**
2527          * Compare with another title.
2528          *
2529          * @param Title $title
2530          * @return bool
2531          */
2532         function equals( $title ) {
2533                 // Note: === is necessary for proper matching of number-like titles.
2534                 return $this->getInterwiki() === $title->getInterwiki()
2535                         && $this->getNamespace() == $title->getNamespace()
2536                         && $this->getDbkey() === $title->getDbkey();
2537         }
2538
2539         /**
2540          * Check if page exists
2541          * @return bool
2542          */
2543         function exists() {
2544                 return $this->getArticleId() != 0;
2545         }
2546
2547         /**
2548          * Should a link should be displayed as a known link, just based on its title?
2549          *
2550          * Currently, a self-link with a fragment and special pages are in
2551          * this category. Special pages never exist in the database.
2552          */
2553         function isAlwaysKnown() {
2554                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2555                   || NS_SPECIAL == $this->mNamespace;
2556         }
2557
2558         /**
2559          * Update page_touched timestamps and send squid purge messages for
2560          * pages linking to this title. May be sent to the job queue depending
2561          * on the number of links. Typically called on create and delete.
2562          */
2563         function touchLinks() {
2564                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2565                 $u->doUpdate();
2566
2567                 if ( $this->getNamespace() == NS_CATEGORY ) {
2568                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2569                         $u->doUpdate();
2570                 }
2571         }
2572
2573         /**
2574          * Get the last touched timestamp
2575          */
2576         function getTouched() {
2577                 $dbr = wfGetDB( DB_SLAVE );
2578                 $touched = $dbr->selectField( 'page', 'page_touched',
2579                         array(
2580                                 'page_namespace' => $this->getNamespace(),
2581                                 'page_title' => $this->getDBkey()
2582                         ), __METHOD__
2583                 );
2584                 return $touched;
2585         }
2586
2587         /**
2588          * Get a cached value from a global cache that is invalidated when this page changes
2589          * @param string $key the key
2590          * @param callback $callback A callback function which generates the value on cache miss
2591          *
2592          * @deprecated use DependencyWrapper
2593          */
2594         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2595                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2596                         $params, new TitleDependency( $this ) );
2597         }
2598
2599         function trackbackURL() {
2600                 global $wgTitle, $wgScriptPath, $wgServer;
2601
2602                 return "$wgServer$wgScriptPath/trackback.php?article="
2603                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2604         }
2605
2606         function trackbackRDF() {
2607                 $url = htmlspecialchars($this->getFullURL());
2608                 $title = htmlspecialchars($this->getText());
2609                 $tburl = $this->trackbackURL();
2610
2611                 return "
2612 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2613          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2614          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2615 <rdf:Description
2616    rdf:about=\"$url\"
2617    dc:identifier=\"$url\"
2618    dc:title=\"$title\"
2619    trackback:ping=\"$tburl\" />
2620 </rdf:RDF>";
2621         }
2622
2623         /**
2624          * Generate strings used for xml 'id' names in monobook tabs
2625          * @return string
2626          */
2627         function getNamespaceKey() {
2628                 global $wgContLang;
2629                 switch ($this->getNamespace()) {
2630                         case NS_MAIN:
2631                         case NS_TALK:
2632                                 return 'nstab-main';
2633                         case NS_USER:
2634                         case NS_USER_TALK:
2635                                 return 'nstab-user';
2636                         case NS_MEDIA:
2637                                 return 'nstab-media';
2638                         case NS_SPECIAL:
2639                                 return 'nstab-special';
2640                         case NS_PROJECT:
2641                         case NS_PROJECT_TALK:
2642                                 return 'nstab-project';
2643                         case NS_IMAGE:
2644                         case NS_IMAGE_TALK:
2645                                 return 'nstab-image';
2646                         case NS_MEDIAWIKI:
2647                         case NS_MEDIAWIKI_TALK:
2648                                 return 'nstab-mediawiki';
2649                         case NS_TEMPLATE:
2650                         case NS_TEMPLATE_TALK:
2651                                 return 'nstab-template';
2652                         case NS_HELP:
2653                         case NS_HELP_TALK:
2654                                 return 'nstab-help';
2655                         case NS_CATEGORY:
2656                         case NS_CATEGORY_TALK:
2657                                 return 'nstab-category';
2658                         default:
2659                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2660                 }
2661         }
2662
2663         /**
2664          * Returns true if this title resolves to the named special page
2665          * @param string $name The special page name
2666          * @access public
2667          */
2668         function isSpecial( $name ) {
2669                 if ( $this->getNamespace() == NS_SPECIAL ) {
2670                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2671                         if ( $name == $thisName ) {
2672                                 return true;
2673                         }
2674                 }
2675                 return false;
2676         }
2677
2678         /**
2679          * If the Title refers to a special page alias which is not the local default,
2680          * returns a new Title which points to the local default. Otherwise, returns $this.
2681          */
2682         function fixSpecialName() {
2683                 if ( $this->getNamespace() == NS_SPECIAL ) {
2684                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2685                         if ( $canonicalName ) {
2686                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2687                                 if ( $localName != $this->mDbkeyform ) {
2688                                         return Title::makeTitle( NS_SPECIAL, $localName );
2689                                 }
2690                         }
2691                 }
2692                 return $this;
2693         }
2694
2695         /**
2696          * Is this Title in a namespace which contains content?
2697          * In other words, is this a content page, for the purposes of calculating
2698          * statistics, etc?
2699          *
2700          * @return bool
2701          */
2702         public function isContentPage() {
2703                 return Namespace::isContent( $this->getNamespace() );
2704         }
2705
2706 }
2707
2708 ?>