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 lowest-level subpage name, i.e. the rightmost part after /
 696          * @return string Subpage name
 697          */
 698         function getSubpageText() {
 699                 global $wgNamespacesWithSubpages;
 700                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 701                         $parts = explode( '/', $this->mTextform );
 702                         return( $parts[ count( $parts ) - 1 ] );
 703                 } else {
 704                         return( $this->mTextform );
 705                 }
 706         }
 707
 708         /**
 709          * Get a URL-encoded form of the subpage text
 710          * @return string URL-encoded subpage name
 711          */
 712         function getSubpageUrlForm() {
 713                 $text = $this->getSubpageText();
 714                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 715                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 716                 return( $text );
 717         }
 718
 719         /**
 720          * Get a URL-encoded title (not an actual URL) including interwiki
 721          * @return string the URL-encoded form
 722          * @access public
 723          */
 724         function getPrefixedURL() {
 725                 $s = $this->prefix( $this->mDbkeyform );
 726                 $s = str_replace( ' ', '_', $s );
 727
 728                 $s = wfUrlencode ( $s ) ;
 729
 730                 # Cleaning up URL to make it look nice -- is this safe?
 731                 $s = str_replace( '%28', '(', $s );
 732                 $s = str_replace( '%29', ')', $s );
 733
 734                 return $s;
 735         }
 736
 737         /**
 738          * Get a real URL referring to this title, with interwiki link and
 739          * fragment
 740          *
 741          * @param string $query an optional query string, not used
 742          *      for interwiki links
 743          * @return string the URL
 744          * @access public
 745          */
 746         function getFullURL( $query = '' ) {
 747                 global $wgContLang, $wgServer, $wgRequest;
 748
 749                 if ( '' == $this->mInterwiki ) {
 750                         $url = $this->getLocalUrl( $query );
 751
 752                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 753                         // Correct fix would be to move the prepending elsewhere.
 754                         if ($wgRequest->getVal('action') != 'render') {
 755                                 $url = $wgServer . $url;
 756                         }
 757                 } else {
 758                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 759
 760                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 761                         if ( '' != $namespace ) {
 762                                 # Can this actually happen? Interwikis shouldn't be parsed.
 763                                 $namespace .= ':';
 764                         }
 765                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 766                         if( $query != '' ) {
 767                                 if( false === strpos( $url, '?' ) ) {
 768                                         $url .= '?';
 769                                 } else {
 770                                         $url .= '&';
 771                                 }
 772                                 $url .= $query;
 773                         }
 774                 }
 775
 776                 # Finally, add the fragment.
 777                 if ( '' != $this->mFragment ) {
 778                         $url .= '#' . $this->mFragment;
 779                 }
 780
 781                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 782                 return $url;
 783         }
 784
 785         /**
 786          * Get a URL with no fragment or server name.  If this page is generated
 787          * with action=render, $wgServer is prepended.
 788          * @param string $query an optional query string; if not specified,
 789          *      $wgArticlePath will be used.
 790          * @return string the URL
 791          * @access public
 792          */
 793         function getLocalURL( $query = '' ) {
 794                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 795
 796                 if ( $this->isExternal() ) {
 797                         $url = $this->getFullURL();
 798                         if ( $query ) {
 799                                 // This is currently only used for edit section links in the
 800                                 // context of interwiki transclusion. In theory we should
 801                                 // append the query to the end of any existing query string,
 802                                 // but interwiki transclusion is already broken in that case.
 803                                 $url .= "?$query";
 804                         }
 805                 } else {
 806                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 807                         if ( $query == '' ) {
 808                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
 809                         } else {
 810                                 global $wgActionPaths;
 811                                 $url = false;
 812                                 if( !empty( $wgActionPaths ) &&
 813                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 814                                 {
 815                                         $action = urldecode( $matches[2] );
 816                                         if( isset( $wgActionPaths[$action] ) ) {
 817                                                 $query = $matches[1];
 818                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 819                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 820                                                 if( $query != '' ) $url .= '?' . $query;
 821                                         }
 822                                 }
 823                                 if ( $url === false ) {
 824                                         if ( $query == '-' ) {
 825                                                 $query = '';
 826                                         }
 827                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 828                                 }
 829                         }
 830
 831                         // FIXME: this causes breakage in various places when we
 832                         // actually expected a local URL and end up with dupe prefixes.
 833                         if ($wgRequest->getVal('action') == 'render') {
 834                                 $url = $wgServer . $url;
 835                         }
 836                 }
 837                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 838                 return $url;
 839         }
 840
 841         /**
 842          * Get an HTML-escaped version of the URL form, suitable for
 843          * using in a link, without a server name or fragment
 844          * @param string $query an optional query string
 845          * @return string the URL
 846          * @access public
 847          */
 848         function escapeLocalURL( $query = '' ) {
 849                 return htmlspecialchars( $this->getLocalURL( $query ) );
 850         }
 851
 852         /**
 853          * Get an HTML-escaped version of the URL form, suitable for
 854          * using in a link, including the server name and fragment
 855          *
 856          * @return string the URL
 857          * @param string $query an optional query string
 858          * @access public
 859          */
 860         function escapeFullURL( $query = '' ) {
 861                 return htmlspecialchars( $this->getFullURL( $query ) );
 862         }
 863
 864         /**
 865          * Get the URL form for an internal link.
 866          * - Used in various Squid-related code, in case we have a different
 867          * internal hostname for the server from the exposed one.
 868          *
 869          * @param string $query an optional query string
 870          * @return string the URL
 871          * @access public
 872          */
 873         function getInternalURL( $query = '' ) {
 874                 global $wgInternalServer;
 875                 $url = $wgInternalServer . $this->getLocalURL( $query );
 876                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 877                 return $url;
 878         }
 879
 880         /**
 881          * Get the edit URL for this Title
 882          * @return string the URL, or a null string if this is an
 883          *      interwiki link
 884          * @access public
 885          */
 886         function getEditURL() {
 887                 if ( '' != $this->mInterwiki ) { return ''; }
 888                 $s = $this->getLocalURL( 'action=edit' );
 889
 890                 return $s;
 891         }
 892
 893         /**
 894          * Get the HTML-escaped displayable text form.
 895          * Used for the title field in <a> tags.
 896          * @return string the text, including any prefixes
 897          * @access public
 898          */
 899         function getEscapedText() {
 900                 return htmlspecialchars( $this->getPrefixedText() );
 901         }
 902
 903         /**
 904          * Is this Title interwiki?
 905          * @return boolean
 906          * @access public
 907          */
 908         function isExternal() { return ( '' != $this->mInterwiki ); }
 909
 910         /**
 911          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 912          *
 913          * @param string Action to check (default: edit)
 914          * @return bool
 915          */
 916         function isSemiProtected( $action = 'edit' ) {
 917                 $restrictions = $this->getRestrictions( $action );
 918                 # We do a full compare because this could be an array
 919                 foreach( $restrictions as $restriction ) {
 920                         if( strtolower( $restriction ) != 'autoconfirmed' ) {
 921                                 return( false );
 922                         }
 923                 }
 924                 return( true );
 925         }
 926
 927         /**
 928          * Does the title correspond to a protected article?
 929          * @param string $what the action the page is protected from,
 930          *      by default checks move and edit
 931          * @return boolean
 932          * @access public
 933          */
 934         function isProtected( $action = '' ) {
 935                 global $wgRestrictionLevels;
 936                 if ( -1 == $this->mNamespace ) { return true; }
 937
 938                 if( $action == 'edit' || $action == '' ) {
 939                         $r = $this->getRestrictions( 'edit' );
 940                         foreach( $wgRestrictionLevels as $level ) {
 941                                 if( in_array( $level, $r ) && $level != '' ) {
 942                                         return( true );
 943                                 }
 944                         }
 945                 }
 946
 947                 if( $action == 'move' || $action == '' ) {
 948                         $r = $this->getRestrictions( 'move' );
 949                         foreach( $wgRestrictionLevels as $level ) {
 950                                 if( in_array( $level, $r ) && $level != '' ) {
 951                                         return( true );
 952                                 }
 953                         }
 954                 }
 955
 956                 return false;
 957         }
 958
 959         /**
 960          * Is $wgUser is watching this page?
 961          * @return boolean
 962          * @access public
 963          */
 964         function userIsWatching() {
 965                 global $wgUser;
 966
 967                 if ( is_null( $this->mWatched ) ) {
 968                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 969                                 $this->mWatched = false;
 970                         } else {
 971                                 $this->mWatched = $wgUser->isWatched( $this );
 972                         }
 973                 }
 974                 return $this->mWatched;
 975         }
 976
 977         /**
 978          * Can $wgUser perform $action this page?
 979          * @param string $action action that permission needs to be checked for
 980          * @return boolean
 981          * @access private
 982          */
 983         function userCan($action) {
 984                 $fname = 'Title::userCan';
 985                 wfProfileIn( $fname );
 986
 987                 global $wgUser;
 988
 989                 $result = null;
 990                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
 991                 if ( $result !== null ) {
 992                         wfProfileOut( $fname );
 993                         return $result;
 994                 }
 995
 996                 if( NS_SPECIAL == $this->mNamespace ) {
 997                         wfProfileOut( $fname );
 998                         return false;
 999                 }
1000                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
1001                 // from taking effect -ævar
1002                 if( NS_MEDIAWIKI == $this->mNamespace &&
1003                     !$wgUser->isAllowed('editinterface') ) {
1004                         wfProfileOut( $fname );
1005                         return false;
1006                 }
1007
1008                 if( $this->mDbkeyform == '_' ) {
1009                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1010                         wfProfileOut( $fname );
1011                         return false;
1012                 }
1013
1014                 # protect global styles and js
1015                 if ( NS_MEDIAWIKI == $this->mNamespace
1016                  && preg_match("/\\.(css|js)$/", $this->mTextform )
1017                      && !$wgUser->isAllowed('editinterface') ) {
1018                         wfProfileOut( $fname );
1019                         return false;
1020                 }
1021
1022                 # protect css/js subpages of user pages
1023                 # XXX: this might be better using restrictions
1024                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1025                 if( NS_USER == $this->mNamespace
1026                         && preg_match("/\\.(css|js)$/", $this->mTextform )
1027                         && !$wgUser->isAllowed('editinterface')
1028                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1029                         wfProfileOut( $fname );
1030                         return false;
1031                 }
1032
1033                 foreach( $this->getRestrictions($action) as $right ) {
1034                         // Backwards compatibility, rewrite sysop -> protect
1035                         if ( $right == 'sysop' ) {
1036                                 $right = 'protect';
1037                         }
1038                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1039                                 wfProfileOut( $fname );
1040                                 return false;
1041                         }
1042                 }
1043
1044                 if( $action == 'move' &&
1045                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1046                         wfProfileOut( $fname );
1047                         return false;
1048                 }
1049
1050                 if( $action == 'create' ) {
1051                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1052                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1053                                 return false;
1054                         }
1055                 }
1056
1057                 wfProfileOut( $fname );
1058                 return true;
1059         }
1060
1061         /**
1062          * Can $wgUser edit this page?
1063          * @return boolean
1064          * @access public
1065          */
1066         function userCanEdit() {
1067                 return $this->userCan('edit');
1068         }
1069
1070         /**
1071          * Can $wgUser move this page?
1072          * @return boolean
1073          * @access public
1074          */
1075         function userCanMove() {
1076                 return $this->userCan('move');
1077         }
1078
1079         /**
1080          * Would anybody with sufficient privileges be able to move this page?
1081          * Some pages just aren't movable.
1082          *
1083          * @return boolean
1084          * @access public
1085          */
1086         function isMovable() {
1087                 return Namespace::isMovable( $this->getNamespace() )
1088                         && $this->getInterwiki() == '';
1089         }
1090
1091         /**
1092          * Can $wgUser read this page?
1093          * @return boolean
1094          * @access public
1095          */
1096         function userCanRead() {
1097                 global $wgUser;
1098
1099                 $result = null;
1100                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1101                 if ( $result !== null ) {
1102                         return $result;
1103                 }
1104
1105                 if( $wgUser->isAllowed('read') ) {
1106                         return true;
1107                 } else {
1108                         global $wgWhitelistRead;
1109
1110                         /** If anon users can create an account,
1111                             they need to reach the login page first! */
1112                         if( $wgUser->isAllowed( 'createaccount' )
1113                             && $this->getNamespace() == NS_SPECIAL
1114                             && $this->getText() == 'Userlogin' ) {
1115                                 return true;
1116                         }
1117
1118                         /** some pages are explicitly allowed */
1119                         $name = $this->getPrefixedText();
1120                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1121                                 return true;
1122                         }
1123
1124                         # Compatibility with old settings
1125                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1126                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1127                                         return true;
1128                                 }
1129                         }
1130                 }
1131                 return false;
1132         }
1133
1134         /**
1135          * Is this a talk page of some sort?
1136          * @return bool
1137          * @access public
1138          */
1139         function isTalkPage() {
1140                 return Namespace::isTalk( $this->getNamespace() );
1141         }
1142
1143         /**
1144          * Is this a .css or .js subpage of a user page?
1145          * @return bool
1146          * @access public
1147          */
1148         function isCssJsSubpage() {
1149                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1150         }
1151         /**
1152          * Is this a *valid* .css or .js subpage of a user page?
1153          * Check that the corresponding skin exists
1154          */
1155         function isValidCssJsSubpage() {
1156                 global $wgValidSkinNames;
1157                 return( $this->isCssJsSubpage() && array_key_exists( $this->getSkinFromCssJsSubpage(), $wgValidSkinNames ) );
1158         }
1159         /**
1160          * Trim down a .css or .js subpage title to get the corresponding skin name
1161          */
1162         function getSkinFromCssJsSubpage() {
1163                 $subpage = explode( '/', $this->mTextform );
1164                 $subpage = $subpage[ count( $subpage ) - 1 ];
1165                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1166         }
1167         /**
1168          * Is this a .css subpage of a user page?
1169          * @return bool
1170          * @access public
1171          */
1172         function isCssSubpage() {
1173                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1174         }
1175         /**
1176          * Is this a .js subpage of a user page?
1177          * @return bool
1178          * @access public
1179          */
1180         function isJsSubpage() {
1181                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1182         }
1183         /**
1184          * Protect css/js subpages of user pages: can $wgUser edit
1185          * this page?
1186          *
1187          * @return boolean
1188          * @todo XXX: this might be better using restrictions
1189          * @access public
1190          */
1191         function userCanEditCssJsSubpage() {
1192                 global $wgUser;
1193                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1194         }
1195
1196         /**
1197          * Loads a string into mRestrictions array
1198          * @param string $res restrictions in string format
1199          * @access public
1200          */
1201         function loadRestrictions( $res ) {
1202                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1203                         $temp = explode( '=', trim( $restrict ) );
1204                         if(count($temp) == 1) {
1205                                 // old format should be treated as edit/move restriction
1206                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1207                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1208                         } else {
1209                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1210                         }
1211                 }
1212                 $this->mRestrictionsLoaded = true;
1213         }
1214
1215         /**
1216          * Accessor/initialisation for mRestrictions
1217          * @param string $action action that permission needs to be checked for
1218          * @return array the array of groups allowed to edit this article
1219          * @access public
1220          */
1221         function getRestrictions($action) {
1222                 $id = $this->getArticleID();
1223                 if ( 0 == $id ) { return array(); }
1224
1225                 if ( ! $this->mRestrictionsLoaded ) {
1226                         $dbr =& wfGetDB( DB_SLAVE );
1227                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1228                         $this->loadRestrictions( $res );
1229                 }
1230                 if( isset( $this->mRestrictions[$action] ) ) {
1231                         return $this->mRestrictions[$action];
1232                 }
1233                 return array();
1234         }
1235
1236         /**
1237          * Is there a version of this page in the deletion archive?
1238          * @return int the number of archived revisions
1239          * @access public
1240          */
1241         function isDeleted() {
1242                 $fname = 'Title::isDeleted';
1243                 if ( $this->getNamespace() < 0 ) {
1244                         $n = 0;
1245                 } else {
1246                         $dbr =& wfGetDB( DB_SLAVE );
1247                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1248                                 'ar_title' => $this->getDBkey() ), $fname );
1249                 }
1250                 return (int)$n;
1251         }
1252
1253         /**
1254          * Get the article ID for this Title from the link cache,
1255          * adding it if necessary
1256          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1257          *      for update
1258          * @return int the ID
1259          * @access public
1260          */
1261         function getArticleID( $flags = 0 ) {
1262                 $linkCache =& LinkCache::singleton();
1263                 if ( $flags & GAID_FOR_UPDATE ) {
1264                         $oldUpdate = $linkCache->forUpdate( true );
1265                         $this->mArticleID = $linkCache->addLinkObj( $this );
1266                         $linkCache->forUpdate( $oldUpdate );
1267                 } else {
1268                         if ( -1 == $this->mArticleID ) {
1269                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1270                         }
1271                 }
1272                 return $this->mArticleID;
1273         }
1274
1275         function getLatestRevID() {
1276                 if ($this->mLatestID !== false)
1277                         return $this->mLatestID;
1278
1279                 $db =& wfGetDB(DB_SLAVE);
1280                 return $this->mLatestID = $db->selectField( 'revision',
1281                         "max(rev_id)",
1282                         array('rev_page' => $this->getArticleID()),
1283                         'Title::getLatestRevID' );
1284         }
1285
1286         /**
1287          * This clears some fields in this object, and clears any associated
1288          * keys in the "bad links" section of the link cache.
1289          *
1290          * - This is called from Article::insertNewArticle() to allow
1291          * loading of the new page_id. It's also called from
1292          * Article::doDeleteArticle()
1293          *
1294          * @param int $newid the new Article ID
1295          * @access public
1296          */
1297         function resetArticleID( $newid ) {
1298                 $linkCache =& LinkCache::singleton();
1299                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1300
1301                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1302                 else { $this->mArticleID = $newid; }
1303                 $this->mRestrictionsLoaded = false;
1304                 $this->mRestrictions = array();
1305         }
1306
1307         /**
1308          * Updates page_touched for this page; called from LinksUpdate.php
1309          * @return bool true if the update succeded
1310          * @access public
1311          */
1312         function invalidateCache() {
1313                 global $wgUseFileCache;
1314
1315                 if ( wfReadOnly() ) {
1316                         return;
1317                 }
1318
1319                 $dbw =& wfGetDB( DB_MASTER );
1320                 $success = $dbw->update( 'page',
1321                         array( /* SET */
1322                                 'page_touched' => $dbw->timestamp()
1323                         ), array( /* WHERE */
1324                                 'page_namespace' => $this->getNamespace() ,
1325                                 'page_title' => $this->getDBkey()
1326                         ), 'Title::invalidateCache'
1327                 );
1328
1329                 if ($wgUseFileCache) {
1330                         $cache = new CacheManager($this);
1331                         @unlink($cache->fileCacheName());
1332                 }
1333
1334                 return $success;
1335         }
1336
1337         /**
1338          * Prefix some arbitrary text with the namespace or interwiki prefix
1339          * of this object
1340          *
1341          * @param string $name the text
1342          * @return string the prefixed text
1343          * @access private
1344          */
1345         /* private */ function prefix( $name ) {
1346                 global $wgContLang;
1347
1348                 $p = '';
1349                 if ( '' != $this->mInterwiki ) {
1350                         $p = $this->mInterwiki . ':';
1351                 }
1352                 if ( 0 != $this->mNamespace ) {
1353                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1354                 }
1355                 return $p . $name;
1356         }
1357
1358         /**
1359          * Secure and split - main initialisation function for this object
1360          *
1361          * Assumes that mDbkeyform has been set, and is urldecoded
1362          * and uses underscores, but not otherwise munged.  This function
1363          * removes illegal characters, splits off the interwiki and
1364          * namespace prefixes, sets the other forms, and canonicalizes
1365          * everything.
1366          * @return bool true on success
1367          * @access private
1368          */
1369         /* private */ function secureAndSplit() {
1370                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1371                 $fname = 'Title::secureAndSplit';
1372
1373                 # Initialisation
1374                 static $rxTc = false;
1375                 if( !$rxTc ) {
1376                         # % is needed as well
1377                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1378                 }
1379
1380                 $this->mInterwiki = $this->mFragment = '';
1381                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1382
1383                 # Clean up whitespace
1384                 #
1385                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1386                 $t = trim( $t, '_' );
1387
1388                 if ( '' == $t ) {
1389                         return false;
1390                 }
1391
1392                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1393                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1394                         return false;
1395                 }
1396
1397                 $this->mDbkeyform = $t;
1398
1399                 # Initial colon indicates main namespace rather than specified default
1400                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1401                 if ( ':' == $t{0} ) {
1402                         $this->mNamespace = NS_MAIN;
1403                         $t = substr( $t, 1 ); # remove the colon but continue processing
1404                 }
1405
1406                 # Namespace or interwiki prefix
1407                 $firstPass = true;
1408                 do {
1409                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1410                                 $p = $m[1];
1411                                 $lowerNs = strtolower( $p );
1412                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1413                                         # Canonical namespace
1414                                         $t = $m[2];
1415                                         $this->mNamespace = $ns;
1416                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1417                                         # Ordinary namespace
1418                                         $t = $m[2];
1419                                         $this->mNamespace = $ns;
1420                                 } elseif( $this->getInterwikiLink( $p ) ) {
1421                                         if( !$firstPass ) {
1422                                                 # Can't make a local interwiki link to an interwiki link.
1423                                                 # That's just crazy!
1424                                                 return false;
1425                                         }
1426
1427                                         # Interwiki link
1428                                         $t = $m[2];
1429                                         $this->mInterwiki = strtolower( $p );
1430
1431                                         # Redundant interwiki prefix to the local wiki
1432                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1433                                                 if( $t == '' ) {
1434                                                         # Can't have an empty self-link
1435                                                         return false;
1436                                                 }
1437                                                 $this->mInterwiki = '';
1438                                                 $firstPass = false;
1439                                                 # Do another namespace split...
1440                                                 continue;
1441                                         }
1442
1443                                         # If there's an initial colon after the interwiki, that also
1444                                         # resets the default namespace
1445                                         if ( $t !== '' && $t[0] == ':' ) {
1446                                                 $this->mNamespace = NS_MAIN;
1447                                                 $t = substr( $t, 1 );
1448                                         }
1449                                 }
1450                                 # If there's no recognized interwiki or namespace,
1451                                 # then let the colon expression be part of the title.
1452                         }
1453                         break;
1454                 } while( true );
1455                 $r = $t;
1456
1457                 # We already know that some pages won't be in the database!
1458                 #
1459                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1460                         $this->mArticleID = 0;
1461                 }
1462                 $f = strstr( $r, '#' );
1463                 if ( false !== $f ) {
1464                         $this->mFragment = substr( $f, 1 );
1465                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1466                         # remove whitespace again: prevents "Foo_bar_#"
1467                         # becoming "Foo_bar_"
1468                         $r = preg_replace( '/_*$/', '', $r );
1469                 }
1470
1471                 # Reject illegal characters.
1472                 #
1473                 if( preg_match( $rxTc, $r ) ) {
1474                         return false;
1475                 }
1476
1477                 /**
1478                  * Pages with "/./" or "/../" appearing in the URLs will
1479                  * often be unreachable due to the way web browsers deal
1480                  * with 'relative' URLs. Forbid them explicitly.
1481                  */
1482                 if ( strpos( $r, '.' ) !== false &&
1483                      ( $r === '.' || $r === '..' ||
1484                        strpos( $r, './' ) === 0  ||
1485                        strpos( $r, '../' ) === 0 ||
1486                        strpos( $r, '/./' ) !== false ||
1487                        strpos( $r, '/../' ) !== false ) )
1488                 {
1489                         return false;
1490                 }
1491
1492                 # We shouldn't need to query the DB for the size.
1493                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1494                 if ( strlen( $r ) > 255 ) {
1495                         return false;
1496                 }
1497
1498                 /**
1499                  * Normally, all wiki links are forced to have
1500                  * an initial capital letter so [[foo]] and [[Foo]]
1501                  * point to the same place.
1502                  *
1503                  * Don't force it for interwikis, since the other
1504                  * site might be case-sensitive.
1505                  */
1506                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1507                         $t = $wgContLang->ucfirst( $r );
1508                 } else {
1509                         $t = $r;
1510                 }
1511
1512                 /**
1513                  * Can't make a link to a namespace alone...
1514                  * "empty" local links can only be self-links
1515                  * with a fragment identifier.
1516                  */
1517                 if( $t == '' &&
1518                         $this->mInterwiki == '' &&
1519                         $this->mNamespace != NS_MAIN ) {
1520                         return false;
1521                 }
1522
1523                 // Any remaining initial :s are illegal.
1524                 if ( $t !== '' && ':' == $t{0} ) {
1525                         return false;
1526                 }
1527
1528                 # Fill fields
1529                 $this->mDbkeyform = $t;
1530                 $this->mUrlform = wfUrlencode( $t );
1531
1532                 $this->mTextform = str_replace( '_', ' ', $t );
1533
1534                 return true;
1535         }
1536
1537         /**
1538          * Get a Title object associated with the talk page of this article
1539          * @return Title the object for the talk page
1540          * @access public
1541          */
1542         function getTalkPage() {
1543                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1544         }
1545
1546         /**
1547          * Get a title object associated with the subject page of this
1548          * talk page
1549          *
1550          * @return Title the object for the subject page
1551          * @access public
1552          */
1553         function getSubjectPage() {
1554                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1555         }
1556
1557         /**
1558          * Get an array of Title objects linking to this Title
1559          * Also stores the IDs in the link cache.
1560          *
1561          * @param string $options may be FOR UPDATE
1562          * @return array the Title objects linking here
1563          * @access public
1564          */
1565         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1566                 $linkCache =& LinkCache::singleton();
1567                 $id = $this->getArticleID();
1568
1569                 if ( $options ) {
1570                         $db =& wfGetDB( DB_MASTER );
1571                 } else {
1572                         $db =& wfGetDB( DB_SLAVE );
1573                 }
1574
1575                 $res = $db->select( array( 'page', $table ),
1576                         array( 'page_namespace', 'page_title', 'page_id' ),
1577                         array(
1578                                 "{$prefix}_from=page_id",
1579                                 "{$prefix}_namespace" => $this->getNamespace(),
1580                                 "{$prefix}_title"     => $this->getDbKey() ),
1581                         'Title::getLinksTo',
1582                         $options );
1583
1584                 $retVal = array();
1585                 if ( $db->numRows( $res ) ) {
1586                         while ( $row = $db->fetchObject( $res ) ) {
1587                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1588                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1589                                         $retVal[] = $titleObj;
1590                                 }
1591                         }
1592                 }
1593                 $db->freeResult( $res );
1594                 return $retVal;
1595         }
1596
1597         /**
1598          * Get an array of Title objects using this Title as a template
1599          * Also stores the IDs in the link cache.
1600          *
1601          * @param string $options may be FOR UPDATE
1602          * @return array the Title objects linking here
1603          * @access public
1604          */
1605         function getTemplateLinksTo( $options = '' ) {
1606                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1607         }
1608
1609         /**
1610          * Get an array of Title objects referring to non-existent articles linked from this page
1611          *
1612          * @param string $options may be FOR UPDATE
1613          * @return array the Title objects
1614          * @access public
1615          */
1616         function getBrokenLinksFrom( $options = '' ) {
1617                 if ( $options ) {
1618                         $db =& wfGetDB( DB_MASTER );
1619                 } else {
1620                         $db =& wfGetDB( DB_SLAVE );
1621                 }
1622
1623                 $res = $db->safeQuery(
1624                           "SELECT pl_namespace, pl_title
1625                              FROM !
1626                         LEFT JOIN !
1627                                ON pl_namespace=page_namespace
1628                               AND pl_title=page_title
1629                             WHERE pl_from=?
1630                               AND page_namespace IS NULL
1631                                   !",
1632                         $db->tableName( 'pagelinks' ),
1633                         $db->tableName( 'page' ),
1634                         $this->getArticleId(),
1635                         $options );
1636
1637                 $retVal = array();
1638                 if ( $db->numRows( $res ) ) {
1639                         while ( $row = $db->fetchObject( $res ) ) {
1640                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1641                         }
1642                 }
1643                 $db->freeResult( $res );
1644                 return $retVal;
1645         }
1646
1647
1648         /**
1649          * Get a list of URLs to purge from the Squid cache when this
1650          * page changes
1651          *
1652          * @return array the URLs
1653          * @access public
1654          */
1655         function getSquidURLs() {
1656                 return array(
1657                         $this->getInternalURL(),
1658                         $this->getInternalURL( 'action=history' )
1659                 );
1660         }
1661
1662         /**
1663          * Move this page without authentication
1664          * @param Title &$nt the new page Title
1665          * @access public
1666          */
1667         function moveNoAuth( &$nt ) {
1668                 return $this->moveTo( $nt, false );
1669         }
1670
1671         /**
1672          * Check whether a given move operation would be valid.
1673          * Returns true if ok, or a message key string for an error message
1674          * if invalid. (Scarrrrry ugly interface this.)
1675          * @param Title &$nt the new title
1676          * @param bool $auth indicates whether $wgUser's permissions
1677          *      should be checked
1678          * @return mixed true on success, message name on failure
1679          * @access public
1680          */
1681         function isValidMoveOperation( &$nt, $auth = true ) {
1682                 if( !$this or !$nt ) {
1683                         return 'badtitletext';
1684                 }
1685                 if( $this->equals( $nt ) ) {
1686                         return 'selfmove';
1687                 }
1688                 if( !$this->isMovable() || !$nt->isMovable() ) {
1689                         return 'immobile_namespace';
1690                 }
1691
1692                 $oldid = $this->getArticleID();
1693                 $newid = $nt->getArticleID();
1694
1695                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1696                         return 'articleexists';
1697                 }
1698                 if ( ( '' == $this->getDBkey() ) ||
1699                          ( !$oldid ) ||
1700                      ( '' == $nt->getDBkey() ) ) {
1701                         return 'badarticleerror';
1702                 }
1703
1704                 if ( $auth && (
1705                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1706                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1707                         return 'protectedpage';
1708                 }
1709
1710                 # The move is allowed only if (1) the target doesn't exist, or
1711                 # (2) the target is a redirect to the source, and has no history
1712                 # (so we can undo bad moves right after they're done).
1713
1714                 if ( 0 != $newid ) { # Target exists; check for validity
1715                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1716                                 return 'articleexists';
1717                         }
1718                 }
1719                 return true;
1720         }
1721
1722         /**
1723          * Move a title to a new location
1724          * @param Title &$nt the new title
1725          * @param bool $auth indicates whether $wgUser's permissions
1726          *      should be checked
1727          * @return mixed true on success, message name on failure
1728          * @access public
1729          */
1730         function moveTo( &$nt, $auth = true, $reason = '' ) {
1731                 $err = $this->isValidMoveOperation( $nt, $auth );
1732                 if( is_string( $err ) ) {
1733                         return $err;
1734                 }
1735
1736                 $pageid = $this->getArticleID();
1737                 if( $nt->exists() ) {
1738                         $this->moveOverExistingRedirect( $nt, $reason );
1739                         $pageCountChange = 0;
1740                 } else { # Target didn't exist, do normal move.
1741                         $this->moveToNewTitle( $nt, $reason );
1742                         $pageCountChange = 1;
1743                 }
1744                 $redirid = $this->getArticleID();
1745
1746                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1747                 $dbw =& wfGetDB( DB_MASTER );
1748                 $categorylinks = $dbw->tableName( 'categorylinks' );
1749                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1750                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1751                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1752                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1753
1754                 # Update watchlists
1755
1756                 $oldnamespace = $this->getNamespace() & ~1;
1757                 $newnamespace = $nt->getNamespace() & ~1;
1758                 $oldtitle = $this->getDBkey();
1759                 $newtitle = $nt->getDBkey();
1760
1761                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1762                         WatchedItem::duplicateEntries( $this, $nt );
1763                 }
1764
1765                 # Update search engine
1766                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1767                 $u->doUpdate();
1768                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1769                 $u->doUpdate();
1770
1771                 # Update site_stats
1772                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1773                         # Moved out of main namespace
1774                         # not viewed, edited, removing
1775                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1776                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1777                         # Moved into main namespace
1778                         # not viewed, edited, adding
1779                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1780                 } elseif ( $pageCountChange ) {
1781                         # Added redirect
1782                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1783                 } else{
1784                         $u = false;
1785                 }
1786                 if ( $u ) {
1787                         $u->doUpdate();
1788                 }
1789
1790                 global $wgUser;
1791                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1792                 return true;
1793         }
1794
1795         /**
1796          * Move page to a title which is at present a redirect to the
1797          * source page
1798          *
1799          * @param Title &$nt the page to move to, which should currently
1800          *      be a redirect
1801          * @access private
1802          */
1803         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1804                 global $wgUseSquid, $wgMwRedir;
1805                 $fname = 'Title::moveOverExistingRedirect';
1806                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1807
1808                 if ( $reason ) {
1809                         $comment .= ": $reason";
1810                 }
1811
1812                 $now = wfTimestampNow();
1813                 $rand = wfRandom();
1814                 $newid = $nt->getArticleID();
1815                 $oldid = $this->getArticleID();
1816                 $dbw =& wfGetDB( DB_MASTER );
1817                 $linkCache =& LinkCache::singleton();
1818
1819                 # Delete the old redirect. We don't save it to history since
1820                 # by definition if we've got here it's rather uninteresting.
1821                 # We have to remove it so that the next step doesn't trigger
1822                 # a conflict on the unique namespace+title index...
1823                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1824
1825                 # Save a null revision in the page's history notifying of the move
1826                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1827                 $nullRevId = $nullRevision->insertOn( $dbw );
1828
1829                 # Change the name of the target page:
1830                 $dbw->update( 'page',
1831                         /* SET */ array(
1832                                 'page_touched'   => $dbw->timestamp($now),
1833                                 'page_namespace' => $nt->getNamespace(),
1834                                 'page_title'     => $nt->getDBkey(),
1835                                 'page_latest'    => $nullRevId,
1836                         ),
1837                         /* WHERE */ array( 'page_id' => $oldid ),
1838                         $fname
1839                 );
1840                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1841
1842                 # Recreate the redirect, this time in the other direction.
1843                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1844                 $redirectArticle = new Article( $this );
1845                 $newid = $redirectArticle->insertOn( $dbw );
1846                 $redirectRevision = new Revision( array(
1847                         'page'    => $newid,
1848                         'comment' => $comment,
1849                         'text'    => $redirectText ) );
1850                 $revid = $redirectRevision->insertOn( $dbw );
1851                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1852                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1853
1854                 # Log the move
1855                 $log = new LogPage( 'move' );
1856                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1857
1858                 # Now, we record the link from the redirect to the new title.
1859                 # It should have no other outgoing links...
1860                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1861                 $dbw->insert( 'pagelinks',
1862                         array(
1863                                 'pl_from'      => $newid,
1864                                 'pl_namespace' => $nt->getNamespace(),
1865                                 'pl_title'     => $nt->getDbKey() ),
1866                         $fname );
1867
1868                 # Purge squid
1869                 if ( $wgUseSquid ) {
1870                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1871                         $u = new SquidUpdate( $urls );
1872                         $u->doUpdate();
1873                 }
1874         }
1875
1876         /**
1877          * Move page to non-existing title.
1878          * @param Title &$nt the new Title
1879          * @access private
1880          */
1881         function moveToNewTitle( &$nt, $reason = '' ) {
1882                 global $wgUseSquid;
1883                 global $wgMwRedir;
1884                 $fname = 'MovePageForm::moveToNewTitle';
1885                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1886                 if ( $reason ) {
1887                         $comment .= ": $reason";
1888                 }
1889
1890                 $newid = $nt->getArticleID();
1891                 $oldid = $this->getArticleID();
1892                 $dbw =& wfGetDB( DB_MASTER );
1893                 $now = $dbw->timestamp();
1894                 $rand = wfRandom();
1895                 $linkCache =& LinkCache::singleton();
1896
1897                 # Save a null revision in the page's history notifying of the move
1898                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1899                 $nullRevId = $nullRevision->insertOn( $dbw );
1900
1901                 # Rename cur entry
1902                 $dbw->update( 'page',
1903                         /* SET */ array(
1904                                 'page_touched'   => $now,
1905                                 'page_namespace' => $nt->getNamespace(),
1906                                 'page_title'     => $nt->getDBkey(),
1907                                 'page_latest'    => $nullRevId,
1908                         ),
1909                         /* WHERE */ array( 'page_id' => $oldid ),
1910                         $fname
1911                 );
1912
1913                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1914
1915                 # Insert redirect
1916                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1917                 $redirectArticle = new Article( $this );
1918                 $newid = $redirectArticle->insertOn( $dbw );
1919                 $redirectRevision = new Revision( array(
1920                         'page'    => $newid,
1921                         'comment' => $comment,
1922                         'text'    => $redirectText ) );
1923                 $revid = $redirectRevision->insertOn( $dbw );
1924                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1925                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1926
1927                 # Log the move
1928                 $log = new LogPage( 'move' );
1929                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1930
1931                 # Purge caches as per article creation
1932                 Article::onArticleCreate( $nt );
1933
1934                 # Record the just-created redirect's linking to the page
1935                 $dbw->insert( 'pagelinks',
1936                         array(
1937                                 'pl_from'      => $newid,
1938                                 'pl_namespace' => $nt->getNamespace(),
1939                                 'pl_title'     => $nt->getDBkey() ),
1940                         $fname );
1941
1942                 # Non-existent target may have had broken links to it; these must
1943                 # now be touched to update link coloring.
1944                 $nt->touchLinks();
1945
1946                 # Purge old title from squid
1947                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1948                 $titles = $nt->getLinksTo();
1949                 if ( $wgUseSquid ) {
1950                         $urls = $this->getSquidURLs();
1951                         foreach ( $titles as $linkTitle ) {
1952                                 $urls[] = $linkTitle->getInternalURL();
1953                         }
1954                         $u = new SquidUpdate( $urls );
1955                         $u->doUpdate();
1956                 }
1957         }
1958
1959         /**
1960          * Checks if $this can be moved to a given Title
1961          * - Selects for update, so don't call it unless you mean business
1962          *
1963          * @param Title &$nt the new title to check
1964          * @access public
1965          */
1966         function isValidMoveTarget( $nt ) {
1967
1968                 $fname = 'Title::isValidMoveTarget';
1969                 $dbw =& wfGetDB( DB_MASTER );
1970
1971                 # Is it a redirect?
1972                 $id  = $nt->getArticleID();
1973                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1974                         array( 'page_is_redirect','old_text','old_flags' ),
1975                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1976                         $fname, 'FOR UPDATE' );
1977
1978                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1979                         # Not a redirect
1980                         return false;
1981                 }
1982                 $text = Revision::getRevisionText( $obj );
1983
1984                 # Does the redirect point to the source?
1985                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1986                         $redirTitle = Title::newFromText( $m[1] );
1987                         if( !is_object( $redirTitle ) ||
1988                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1989                                 return false;
1990                         }
1991                 } else {
1992                         # Fail safe
1993                         return false;
1994                 }
1995
1996                 # Does the article have a history?
1997                 $row = $dbw->selectRow( array( 'page', 'revision'),
1998                         array( 'rev_id' ),
1999                         array( 'page_namespace' => $nt->getNamespace(),
2000                                 'page_title' => $nt->getDBkey(),
2001                                 'page_id=rev_page AND page_latest != rev_id'
2002                         ), $fname, 'FOR UPDATE'
2003                 );
2004
2005                 # Return true if there was no history
2006                 return $row === false;
2007         }
2008
2009         /**
2010          * Create a redirect; fails if the title already exists; does
2011          * not notify RC
2012          *
2013          * @param Title $dest the destination of the redirect
2014          * @param string $comment the comment string describing the move
2015          * @return bool true on success
2016          * @access public
2017          */
2018         function createRedirect( $dest, $comment ) {
2019                 if ( $this->getArticleID() ) {
2020                         return false;
2021                 }
2022
2023                 $fname = 'Title::createRedirect';
2024                 $dbw =& wfGetDB( DB_MASTER );
2025
2026                 $article = new Article( $this );
2027                 $newid = $article->insertOn( $dbw );
2028                 $revision = new Revision( array(
2029                         'page'      => $newid,
2030                         'comment'   => $comment,
2031                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2032                         ) );
2033                 $revisionId = $revision->insertOn( $dbw );
2034                 $article->updateRevisionOn( $dbw, $revision, 0 );
2035
2036                 # Link table
2037                 $dbw->insert( 'pagelinks',
2038                         array(
2039                                 'pl_from'      => $newid,
2040                                 'pl_namespace' => $dest->getNamespace(),
2041                                 'pl_title'     => $dest->getDbKey()
2042                         ), $fname
2043                 );
2044
2045                 Article::onArticleCreate( $this );
2046                 return true;
2047         }
2048
2049         /**
2050          * Get categories to which this Title belongs and return an array of
2051          * categories' names.
2052          *
2053          * @return array an array of parents in the form:
2054          *      $parent => $currentarticle
2055          * @access public
2056          */
2057         function getParentCategories() {
2058                 global $wgContLang;
2059
2060                 $titlekey = $this->getArticleId();
2061                 $dbr =& wfGetDB( DB_SLAVE );
2062                 $categorylinks = $dbr->tableName( 'categorylinks' );
2063
2064                 # NEW SQL
2065                 $sql = "SELECT * FROM $categorylinks"
2066                      ." WHERE cl_from='$titlekey'"
2067                          ." AND cl_from <> '0'"
2068                          ." ORDER BY cl_sortkey";
2069
2070                 $res = $dbr->query ( $sql ) ;
2071
2072                 if($dbr->numRows($res) > 0) {
2073                         while ( $x = $dbr->fetchObject ( $res ) )
2074                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2075                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2076                         $dbr->freeResult ( $res ) ;
2077                 } else {
2078                         $data = '';
2079                 }
2080                 return $data;
2081         }
2082
2083         /**
2084          * Get a tree of parent categories
2085          * @param array $children an array with the children in the keys, to check for circular refs
2086          * @return array
2087          * @access public
2088          */
2089         function getParentCategoryTree( $children = array() ) {
2090                 $parents = $this->getParentCategories();
2091
2092                 if($parents != '') {
2093                         foreach($parents as $parent => $current) {
2094                                 if ( array_key_exists( $parent, $children ) ) {
2095                                         # Circular reference
2096                                         $stack[$parent] = array();
2097                                 } else {
2098                                         $nt = Title::newFromText($parent);
2099                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2100                                 }
2101                         }
2102                         return $stack;
2103                 } else {
2104                         return array();
2105                 }
2106         }
2107
2108
2109         /**
2110          * Get an associative array for selecting this title from
2111          * the "page" table
2112          *
2113          * @return array
2114          * @access public
2115          */
2116         function pageCond() {
2117                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2118         }
2119
2120         /**
2121          * Get the revision ID of the previous revision
2122          *
2123          * @param integer $revision  Revision ID. Get the revision that was before this one.
2124          * @return interger $oldrevision|false
2125          */
2126         function getPreviousRevisionID( $revision ) {
2127                 $dbr =& wfGetDB( DB_SLAVE );
2128                 return $dbr->selectField( 'revision', 'rev_id',
2129                         'rev_page=' . intval( $this->getArticleId() ) .
2130                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2131         }
2132
2133         /**
2134          * Get the revision ID of the next revision
2135          *
2136          * @param integer $revision  Revision ID. Get the revision that was after this one.
2137          * @return interger $oldrevision|false
2138          */
2139         function getNextRevisionID( $revision ) {
2140                 $dbr =& wfGetDB( DB_SLAVE );
2141                 return $dbr->selectField( 'revision', 'rev_id',
2142                         'rev_page=' . intval( $this->getArticleId() ) .
2143                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2144         }
2145
2146         /**
2147          * Compare with another title.
2148          *
2149          * @param Title $title
2150          * @return bool
2151          */
2152         function equals( $title ) {
2153                 // Note: === is necessary for proper matching of number-like titles.
2154                 return $this->getInterwiki() === $title->getInterwiki()
2155                         && $this->getNamespace() == $title->getNamespace()
2156                         && $this->getDbkey() === $title->getDbkey();
2157         }
2158
2159         /**
2160          * Check if page exists
2161          * @return bool
2162          */
2163         function exists() {
2164                 return $this->getArticleId() != 0;
2165         }
2166
2167         /**
2168          * Should a link should be displayed as a known link, just based on its title?
2169          *
2170          * Currently, a self-link with a fragment and special pages are in
2171          * this category. Special pages never exist in the database.
2172          */
2173         function isAlwaysKnown() {
2174                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2175                   || NS_SPECIAL == $this->mNamespace;
2176         }
2177
2178         /**
2179          * Update page_touched timestamps on pages linking to this title.
2180          * In principal, this could be backgrounded and could also do squid
2181          * purging.
2182          */
2183         function touchLinks() {
2184                 $fname = 'Title::touchLinks';
2185
2186                 $dbw =& wfGetDB( DB_MASTER );
2187
2188                 $res = $dbw->select( 'pagelinks',
2189                         array( 'pl_from' ),
2190                         array(
2191                                 'pl_namespace' => $this->getNamespace(),
2192                                 'pl_title'     => $this->getDbKey() ),
2193                         $fname );
2194
2195                 $toucharr = array();
2196                 while( $row = $dbw->fetchObject( $res ) ) {
2197                         $toucharr[] = $row->pl_from;
2198                 }
2199                 $dbw->freeResult( $res );
2200
2201                 if( $this->getNamespace() == NS_CATEGORY ) {
2202                         // Categories show up in a separate set of links as well
2203                         $res = $dbw->select( 'categorylinks',
2204                                 array( 'cl_from' ),
2205                                 array( 'cl_to' => $this->getDbKey() ),
2206                                 $fname );
2207                         while( $row = $dbw->fetchObject( $res ) ) {
2208                                 $toucharr[] = $row->cl_from;
2209                         }
2210                         $dbw->freeResult( $res );
2211                 }
2212
2213                 if (!count($toucharr))
2214                         return;
2215                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2216                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2217         }
2218
2219         function trackbackURL() {
2220                 global $wgTitle, $wgScriptPath, $wgServer;
2221
2222                 return "$wgServer$wgScriptPath/trackback.php?article="
2223                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2224         }
2225
2226         function trackbackRDF() {
2227                 $url = htmlspecialchars($this->getFullURL());
2228                 $title = htmlspecialchars($this->getText());
2229                 $tburl = $this->trackbackURL();
2230
2231                 return "
2232 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2233          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2234          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2235 <rdf:Description
2236    rdf:about=\"$url\"
2237    dc:identifier=\"$url\"
2238    dc:title=\"$title\"
2239    trackback:ping=\"$tburl\" />
2240 </rdf:RDF>";
2241         }
2242
2243         /**
2244          * Generate strings used for xml 'id' names in monobook tabs
2245          * @return string
2246          */
2247         function getNamespaceKey() {
2248                 switch ($this->getNamespace()) {
2249                         case NS_MAIN:
2250                         case NS_TALK:
2251                                 return 'nstab-main';
2252                         case NS_USER:
2253                         case NS_USER_TALK:
2254                                 return 'nstab-user';
2255                         case NS_MEDIA:
2256                                 return 'nstab-media';
2257                         case NS_SPECIAL:
2258                                 return 'nstab-special';
2259                         case NS_PROJECT:
2260                         case NS_PROJECT_TALK:
2261                                 return 'nstab-wp';
2262                         case NS_IMAGE:
2263                         case NS_IMAGE_TALK:
2264                                 return 'nstab-image';
2265                         case NS_MEDIAWIKI:
2266                         case NS_MEDIAWIKI_TALK:
2267                                 return 'nstab-mediawiki';
2268                         case NS_TEMPLATE:
2269                         case NS_TEMPLATE_TALK:
2270                                 return 'nstab-template';
2271                         case NS_HELP:
2272                         case NS_HELP_TALK:
2273                                 return 'nstab-help';
2274                         case NS_CATEGORY:
2275                         case NS_CATEGORY_TALK:
2276                                 return 'nstab-category';
2277                         default:
2278                                 return 'nstab-' . strtolower( $this->getSubjectNsText() );
2279                 }
2280         }
2281 }
2282 ?>