includes/Title.php

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