includes/Title.php

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