includes/Title.php

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