includes/Title.php

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