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