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 a URL-encoded title (not an actual URL) including interwiki
 681          * @return string the URL-encoded form
 682          * @access public
 683          */
 684         function getPrefixedURL() {
 685                 $s = $this->prefix( $this->mDbkeyform );
 686                 $s = str_replace( ' ', '_', $s );
 687
 688                 $s = wfUrlencode ( $s ) ;
 689
 690                 # Cleaning up URL to make it look nice -- is this safe?
 691                 $s = str_replace( '%28', '(', $s );
 692                 $s = str_replace( '%29', ')', $s );
 693
 694                 return $s;
 695         }
 696
 697         /**
 698          * Get a real URL referring to this title, with interwiki link and
 699          * fragment
 700          *
 701          * @param string $query an optional query string, not used
 702          *      for interwiki links
 703          * @return string the URL
 704          * @access public
 705          */
 706         function getFullURL( $query = '' ) {
 707                 global $wgContLang, $wgServer, $wgRequest;
 708
 709                 if ( '' == $this->mInterwiki ) {
 710                         $url = $this->getLocalUrl( $query );
 711
 712                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 713                         // Correct fix would be to move the prepending elsewhere.
 714                         if ($wgRequest->getVal('action') != 'render') {
 715                                 $url = $wgServer . $url;
 716                         }
 717                 } else {
 718                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 719
 720                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 721                         if ( '' != $namespace ) {
 722                                 # Can this actually happen? Interwikis shouldn't be parsed.
 723                                 $namespace .= ':';
 724                         }
 725                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 726                         if( $query != '' ) {
 727                                 if( false === strpos( $url, '?' ) ) {
 728                                         $url .= '?';
 729                                 } else {
 730                                         $url .= '&';
 731                                 }
 732                                 $url .= $query;
 733                         }
 734                         if ( '' != $this->mFragment ) {
 735                                 $url .= '#' . $this->mFragment;
 736                         }
 737                 }
 738                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 739                 return $url;
 740         }
 741
 742         /**
 743          * Get a URL with no fragment or server name.  If this page is generated
 744          * with action=render, $wgServer is prepended.
 745          * @param string $query an optional query string; if not specified,
 746          *      $wgArticlePath will be used.
 747          * @return string the URL
 748          * @access public
 749          */
 750         function getLocalURL( $query = '' ) {
 751                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 752
 753                 if ( $this->isExternal() ) {
 754                         $url = $this->getFullURL();
 755                         if ( $query ) {
 756                                 // This is currently only used for edit section links in the
 757                                 // context of interwiki transclusion. In theory we should
 758                                 // append the query to the end of any existing query string,
 759                                 // but interwiki transclusion is already broken in that case.
 760                                 $url .= "?$query";
 761                         }
 762                 } else {
 763                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 764                         if ( $query == '' ) {
 765                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
 766                         } else {
 767                                 global $wgActionPaths;
 768                                 $url = false;
 769                                 if( !empty( $wgActionPaths ) &&
 770                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 771                                 {
 772                                         $action = urldecode( $matches[2] );
 773                                         if( isset( $wgActionPaths[$action] ) ) {
 774                                                 $query = $matches[1];
 775                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 776                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 777                                                 if( $query != '' ) $url .= '?' . $query;
 778                                         }
 779                                 }
 780                                 if ( $url === false ) {
 781                                         if ( $query == '-' ) {
 782                                                 $query = '';
 783                                         }
 784                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 785                                 }
 786                         }
 787
 788                         // FIXME: this causes breakage in various places when we
 789                         // actually expected a local URL and end up with dupe prefixes.
 790                         if ($wgRequest->getVal('action') == 'render') {
 791                                 $url = $wgServer . $url;
 792                         }
 793                 }
 794                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 795                 return $url;
 796         }
 797
 798         /**
 799          * Get an HTML-escaped version of the URL form, suitable for
 800          * using in a link, without a server name or fragment
 801          * @param string $query an optional query string
 802          * @return string the URL
 803          * @access public
 804          */
 805         function escapeLocalURL( $query = '' ) {
 806                 return htmlspecialchars( $this->getLocalURL( $query ) );
 807         }
 808
 809         /**
 810          * Get an HTML-escaped version of the URL form, suitable for
 811          * using in a link, including the server name and fragment
 812          *
 813          * @return string the URL
 814          * @param string $query an optional query string
 815          * @access public
 816          */
 817         function escapeFullURL( $query = '' ) {
 818                 return htmlspecialchars( $this->getFullURL( $query ) );
 819         }
 820
 821         /**
 822          * Get the URL form for an internal link.
 823          * - Used in various Squid-related code, in case we have a different
 824          * internal hostname for the server from the exposed one.
 825          *
 826          * @param string $query an optional query string
 827          * @return string the URL
 828          * @access public
 829          */
 830         function getInternalURL( $query = '' ) {
 831                 global $wgInternalServer;
 832                 $url = $wgInternalServer . $this->getLocalURL( $query );
 833                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 834                 return $url;
 835         }
 836
 837         /**
 838          * Get the edit URL for this Title
 839          * @return string the URL, or a null string if this is an
 840          *      interwiki link
 841          * @access public
 842          */
 843         function getEditURL() {
 844                 global $wgServer, $wgScript;
 845
 846                 if ( '' != $this->mInterwiki ) { return ''; }
 847                 $s = $this->getLocalURL( 'action=edit' );
 848
 849                 return $s;
 850         }
 851
 852         /**
 853          * Get the HTML-escaped displayable text form.
 854          * Used for the title field in <a> tags.
 855          * @return string the text, including any prefixes
 856          * @access public
 857          */
 858         function getEscapedText() {
 859                 return htmlspecialchars( $this->getPrefixedText() );
 860         }
 861
 862         /**
 863          * Is this Title interwiki?
 864          * @return boolean
 865          * @access public
 866          */
 867         function isExternal() { return ( '' != $this->mInterwiki ); }
 868
 869         /**
 870          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 871          *
 872          * @param string Action to check (default: edit)
 873          * @return bool
 874          */
 875         function isSemiProtected( $action = 'edit' ) {
 876                 $restrictions = $this->getRestrictions( $action );
 877                 # We do a full compare because this could be an array
 878                 foreach( $restrictions as $restriction ) {
 879                         if( strtolower( $restriction ) != 'autoconfirmed' ) {
 880                                 return( false );
 881                         }
 882                 }
 883                 return( true );
 884         }
 885
 886         /**
 887          * Does the title correspond to a protected article?
 888          * @param string $what the action the page is protected from,
 889          *      by default checks move and edit
 890          * @return boolean
 891          * @access public
 892          */
 893         function isProtected( $action = '' ) {
 894                 global $wgRestrictionLevels;
 895                 if ( -1 == $this->mNamespace ) { return true; }
 896
 897                 if( $action == 'edit' || $action == '' ) {
 898                         $r = $this->getRestrictions( 'edit' );
 899                         foreach( $wgRestrictionLevels as $level ) {
 900                                 if( in_array( $level, $r ) && $level != '' ) {
 901                                         return( true );
 902                                 }
 903                         }
 904                 }
 905
 906                 if( $action == 'move' || $action == '' ) {
 907                         $r = $this->getRestrictions( 'move' );
 908                         foreach( $wgRestrictionLevels as $level ) {
 909                                 if( in_array( $level, $r ) && $level != '' ) {
 910                                         return( true );
 911                                 }
 912                         }
 913                 }
 914
 915                 return false;
 916         }
 917
 918         /**
 919          * Is $wgUser is watching this page?
 920          * @return boolean
 921          * @access public
 922          */
 923         function userIsWatching() {
 924                 global $wgUser;
 925
 926                 if ( is_null( $this->mWatched ) ) {
 927                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 928                                 $this->mWatched = false;
 929                         } else {
 930                                 $this->mWatched = $wgUser->isWatched( $this );
 931                         }
 932                 }
 933                 return $this->mWatched;
 934         }
 935
 936         /**
 937          * Can $wgUser perform $action this page?
 938          * @param string $action action that permission needs to be checked for
 939          * @return boolean
 940          * @access private
 941          */
 942         function userCan($action) {
 943                 $fname = 'Title::userCan';
 944                 wfProfileIn( $fname );
 945
 946                 global $wgUser;
 947
 948                 $result = true;
 949                 if ( !wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) ) ) {
 950                         wfProfileOut( $fname );
 951                         return $result;
 952                 }
 953
 954                 if( NS_SPECIAL == $this->mNamespace ) {
 955                         wfProfileOut( $fname );
 956                         return false;
 957                 }
 958                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
 959                 // from taking effect -ævar
 960                 if( NS_MEDIAWIKI == $this->mNamespace &&
 961                     !$wgUser->isAllowed('editinterface') ) {
 962                         wfProfileOut( $fname );
 963                         return false;
 964                 }
 965
 966                 if( $this->mDbkeyform == '_' ) {
 967                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 968                         wfProfileOut( $fname );
 969                         return false;
 970                 }
 971
 972                 # protect global styles and js
 973                 if ( NS_MEDIAWIKI == $this->mNamespace
 974                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 975                      && !$wgUser->isAllowed('editinterface') ) {
 976                         wfProfileOut( $fname );
 977                         return false;
 978                 }
 979
 980                 # protect css/js subpages of user pages
 981                 # XXX: this might be better using restrictions
 982                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 983                 if( NS_USER == $this->mNamespace
 984                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 985                         && !$wgUser->isAllowed('editinterface')
 986                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 987                         wfProfileOut( $fname );
 988                         return false;
 989                 }
 990
 991                 foreach( $this->getRestrictions($action) as $right ) {
 992                         // Backwards compatibility, rewrite sysop -> protect
 993                         if ( $right == 'sysop' ) {
 994                                 $right = 'protect';
 995                         }
 996                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 997                                 wfProfileOut( $fname );
 998                                 return false;
 999                         }
1000                 }
1001
1002                 if( $action == 'move' &&
1003                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1004                         wfProfileOut( $fname );
1005                         return false;
1006                 }
1007
1008                 if( $action == 'create' ) {
1009                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1010                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1011                                 return false;
1012                         }
1013                 }
1014
1015                 wfProfileOut( $fname );
1016                 return true;
1017         }
1018
1019         /**
1020          * Can $wgUser edit this page?
1021          * @return boolean
1022          * @access public
1023          */
1024         function userCanEdit() {
1025                 return $this->userCan('edit');
1026         }
1027
1028         /**
1029          * Can $wgUser move this page?
1030          * @return boolean
1031          * @access public
1032          */
1033         function userCanMove() {
1034                 return $this->userCan('move');
1035         }
1036
1037         /**
1038          * Would anybody with sufficient privileges be able to move this page?
1039          * Some pages just aren't movable.
1040          *
1041          * @return boolean
1042          * @access public
1043          */
1044         function isMovable() {
1045                 return Namespace::isMovable( $this->getNamespace() )
1046                         && $this->getInterwiki() == '';
1047         }
1048
1049         /**
1050          * Can $wgUser read this page?
1051          * @return boolean
1052          * @access public
1053          */
1054         function userCanRead() {
1055                 global $wgUser;
1056
1057                 $result = true;
1058                         if ( !wfRunHooks( 'userCan', array( &$this, &$wgUser, "read", &$result ) ) ) {
1059                         return $result;
1060                 }
1061
1062                 if( $wgUser->isAllowed('read') ) {
1063                         return true;
1064                 } else {
1065                         global $wgWhitelistRead;
1066
1067                         /** If anon users can create an account,
1068                             they need to reach the login page first! */
1069                         if( $wgUser->isAllowed( 'createaccount' )
1070                             && $this->getNamespace() == NS_SPECIAL
1071                             && $this->getText() == 'Userlogin' ) {
1072                                 return true;
1073                         }
1074
1075                         /** some pages are explicitly allowed */
1076                         $name = $this->getPrefixedText();
1077                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1078                                 return true;
1079                         }
1080
1081                         # Compatibility with old settings
1082                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1083                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1084                                         return true;
1085                                 }
1086                         }
1087                 }
1088                 return false;
1089         }
1090
1091         /**
1092          * Is this a talk page of some sort?
1093          * @return bool
1094          * @access public
1095          */
1096         function isTalkPage() {
1097                 return Namespace::isTalk( $this->getNamespace() );
1098         }
1099
1100         /**
1101          * Is this a .css or .js subpage of a user page?
1102          * @return bool
1103          * @access public
1104          */
1105         function isCssJsSubpage() {
1106                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1107         }
1108         /**
1109          * Is this a *valid* .css or .js subpage of a user page?
1110          * Check that the corresponding skin exists
1111          */
1112         function isValidCssJsSubpage() {
1113                 global $wgValidSkinNames;
1114                 return( $this->isCssJsSubpage() && array_key_exists( $this->getSkinFromCssJsSubpage(), $wgValidSkinNames ) );
1115         }
1116         /**
1117          * Trim down a .css or .js subpage title to get the corresponding skin name
1118          */
1119         function getSkinFromCssJsSubpage() {
1120                 $subpage = explode( '/', $this->mTextform );
1121                 $subpage = $subpage[ count( $subpage ) - 1 ];
1122                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1123         }
1124         /**
1125          * Is this a .css subpage of a user page?
1126          * @return bool
1127          * @access public
1128          */
1129         function isCssSubpage() {
1130                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1131         }
1132         /**
1133          * Is this a .js subpage of a user page?
1134          * @return bool
1135          * @access public
1136          */
1137         function isJsSubpage() {
1138                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1139         }
1140         /**
1141          * Protect css/js subpages of user pages: can $wgUser edit
1142          * this page?
1143          *
1144          * @return boolean
1145          * @todo XXX: this might be better using restrictions
1146          * @access public
1147          */
1148         function userCanEditCssJsSubpage() {
1149                 global $wgUser;
1150                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1151         }
1152
1153         /**
1154          * Loads a string into mRestrictions array
1155          * @param string $res restrictions in string format
1156          * @access public
1157          */
1158         function loadRestrictions( $res ) {
1159                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1160                         $temp = explode( '=', trim( $restrict ) );
1161                         if(count($temp) == 1) {
1162                                 // old format should be treated as edit/move restriction
1163                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1164                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1165                         } else {
1166                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1167                         }
1168                 }
1169                 $this->mRestrictionsLoaded = true;
1170         }
1171
1172         /**
1173          * Accessor/initialisation for mRestrictions
1174          * @param string $action action that permission needs to be checked for
1175          * @return array the array of groups allowed to edit this article
1176          * @access public
1177          */
1178         function getRestrictions($action) {
1179                 $id = $this->getArticleID();
1180                 if ( 0 == $id ) { return array(); }
1181
1182                 if ( ! $this->mRestrictionsLoaded ) {
1183                         $dbr =& wfGetDB( DB_SLAVE );
1184                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1185                         $this->loadRestrictions( $res );
1186                 }
1187                 if( isset( $this->mRestrictions[$action] ) ) {
1188                         return $this->mRestrictions[$action];
1189                 }
1190                 return array();
1191         }
1192
1193         /**
1194          * Is there a version of this page in the deletion archive?
1195          * @return int the number of archived revisions
1196          * @access public
1197          */
1198         function isDeleted() {
1199                 $fname = 'Title::isDeleted';
1200                 if ( $this->getNamespace() < 0 ) {
1201                         $n = 0;
1202                 } else {
1203                         $dbr =& wfGetDB( DB_SLAVE );
1204                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1205                                 'ar_title' => $this->getDBkey() ), $fname );
1206                 }
1207                 return (int)$n;
1208         }
1209
1210         /**
1211          * Get the article ID for this Title from the link cache,
1212          * adding it if necessary
1213          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1214          *      for update
1215          * @return int the ID
1216          * @access public
1217          */
1218         function getArticleID( $flags = 0 ) {
1219                 $linkCache =& LinkCache::singleton();
1220                 if ( $flags & GAID_FOR_UPDATE ) {
1221                         $oldUpdate = $linkCache->forUpdate( true );
1222                         $this->mArticleID = $linkCache->addLinkObj( $this );
1223                         $linkCache->forUpdate( $oldUpdate );
1224                 } else {
1225                         if ( -1 == $this->mArticleID ) {
1226                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1227                         }
1228                 }
1229                 return $this->mArticleID;
1230         }
1231
1232         function getLatestRevID() {
1233                 if ($this->mLatestID !== false)
1234                         return $this->mLatestID;
1235
1236                 $db =& wfGetDB(DB_SLAVE);
1237                 return $this->mLatestID = $db->selectField( 'revision',
1238                         "max(rev_id)",
1239                         array('rev_page' => $this->getArticleID()),
1240                         'Title::getLatestRevID' );
1241         }
1242
1243         /**
1244          * This clears some fields in this object, and clears any associated
1245          * keys in the "bad links" section of the link cache.
1246          *
1247          * - This is called from Article::insertNewArticle() to allow
1248          * loading of the new page_id. It's also called from
1249          * Article::doDeleteArticle()
1250          *
1251          * @param int $newid the new Article ID
1252          * @access public
1253          */
1254         function resetArticleID( $newid ) {
1255                 $linkCache =& LinkCache::singleton();
1256                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1257
1258                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1259                 else { $this->mArticleID = $newid; }
1260                 $this->mRestrictionsLoaded = false;
1261                 $this->mRestrictions = array();
1262         }
1263
1264         /**
1265          * Updates page_touched for this page; called from LinksUpdate.php
1266          * @return bool true if the update succeded
1267          * @access public
1268          */
1269         function invalidateCache() {
1270                 global $wgUseFileCache;
1271
1272                 if ( wfReadOnly() ) {
1273                         return;
1274                 }
1275
1276                 $dbw =& wfGetDB( DB_MASTER );
1277                 $success = $dbw->update( 'page',
1278                         array( /* SET */
1279                                 'page_touched' => $dbw->timestamp()
1280                         ), array( /* WHERE */
1281                                 'page_namespace' => $this->getNamespace() ,
1282                                 'page_title' => $this->getDBkey()
1283                         ), 'Title::invalidateCache'
1284                 );
1285
1286                 if ($wgUseFileCache) {
1287                         $cache = new CacheManager($this);
1288                         @unlink($cache->fileCacheName());
1289                 }
1290
1291                 return $success;
1292         }
1293
1294         /**
1295          * Prefix some arbitrary text with the namespace or interwiki prefix
1296          * of this object
1297          *
1298          * @param string $name the text
1299          * @return string the prefixed text
1300          * @access private
1301          */
1302         /* private */ function prefix( $name ) {
1303                 global $wgContLang;
1304
1305                 $p = '';
1306                 if ( '' != $this->mInterwiki ) {
1307                         $p = $this->mInterwiki . ':';
1308                 }
1309                 if ( 0 != $this->mNamespace ) {
1310                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1311                 }
1312                 return $p . $name;
1313         }
1314
1315         /**
1316          * Secure and split - main initialisation function for this object
1317          *
1318          * Assumes that mDbkeyform has been set, and is urldecoded
1319          * and uses underscores, but not otherwise munged.  This function
1320          * removes illegal characters, splits off the interwiki and
1321          * namespace prefixes, sets the other forms, and canonicalizes
1322          * everything.
1323          * @return bool true on success
1324          * @access private
1325          */
1326         /* private */ function secureAndSplit() {
1327                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1328                 $fname = 'Title::secureAndSplit';
1329
1330                 # Initialisation
1331                 static $rxTc = false;
1332                 if( !$rxTc ) {
1333                         # % is needed as well
1334                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1335                 }
1336
1337                 $this->mInterwiki = $this->mFragment = '';
1338                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1339
1340                 # Clean up whitespace
1341                 #
1342                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1343                 $t = trim( $t, '_' );
1344
1345                 if ( '' == $t ) {
1346                         return false;
1347                 }
1348
1349                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1350                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1351                         return false;
1352                 }
1353
1354                 $this->mDbkeyform = $t;
1355
1356                 # Initial colon indicates main namespace rather than specified default
1357                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1358                 if ( ':' == $t{0} ) {
1359                         $this->mNamespace = NS_MAIN;
1360                         $t = substr( $t, 1 ); # remove the colon but continue processing
1361                 }
1362
1363                 # Namespace or interwiki prefix
1364                 $firstPass = true;
1365                 do {
1366                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1367                                 $p = $m[1];
1368                                 $lowerNs = strtolower( $p );
1369                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1370                                         # Canonical namespace
1371                                         $t = $m[2];
1372                                         $this->mNamespace = $ns;
1373                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1374                                         # Ordinary namespace
1375                                         $t = $m[2];
1376                                         $this->mNamespace = $ns;
1377                                 } elseif( $this->getInterwikiLink( $p ) ) {
1378                                         if( !$firstPass ) {
1379                                                 # Can't make a local interwiki link to an interwiki link.
1380                                                 # That's just crazy!
1381                                                 return false;
1382                                         }
1383
1384                                         # Interwiki link
1385                                         $t = $m[2];
1386                                         $this->mInterwiki = strtolower( $p );
1387
1388                                         # Redundant interwiki prefix to the local wiki
1389                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1390                                                 if( $t == '' ) {
1391                                                         # Can't have an empty self-link
1392                                                         return false;
1393                                                 }
1394                                                 $this->mInterwiki = '';
1395                                                 $firstPass = false;
1396                                                 # Do another namespace split...
1397                                                 continue;
1398                                         }
1399
1400                                         # If there's an initial colon after the interwiki, that also
1401                                         # resets the default namespace
1402                                         if ( $t !== '' && $t[0] == ':' ) {
1403                                                 $this->mNamespace = NS_MAIN;
1404                                                 $t = substr( $t, 1 );
1405                                         }
1406                                 }
1407                                 # If there's no recognized interwiki or namespace,
1408                                 # then let the colon expression be part of the title.
1409                         }
1410                         break;
1411                 } while( true );
1412                 $r = $t;
1413
1414                 # We already know that some pages won't be in the database!
1415                 #
1416                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1417                         $this->mArticleID = 0;
1418                 }
1419                 $f = strstr( $r, '#' );
1420                 if ( false !== $f ) {
1421                         $this->mFragment = substr( $f, 1 );
1422                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1423                         # remove whitespace again: prevents "Foo_bar_#"
1424                         # becoming "Foo_bar_"
1425                         $r = preg_replace( '/_*$/', '', $r );
1426                 }
1427
1428                 # Reject illegal characters.
1429                 #
1430                 if( preg_match( $rxTc, $r ) ) {
1431                         return false;
1432                 }
1433
1434                 /**
1435                  * Pages with "/./" or "/../" appearing in the URLs will
1436                  * often be unreachable due to the way web browsers deal
1437                  * with 'relative' URLs. Forbid them explicitly.
1438                  */
1439                 if ( strpos( $r, '.' ) !== false &&
1440                      ( $r === '.' || $r === '..' ||
1441                        strpos( $r, './' ) === 0  ||
1442                        strpos( $r, '../' ) === 0 ||
1443                        strpos( $r, '/./' ) !== false ||
1444                        strpos( $r, '/../' ) !== false ) )
1445                 {
1446                         return false;
1447                 }
1448
1449                 # We shouldn't need to query the DB for the size.
1450                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1451                 if ( strlen( $r ) > 255 ) {
1452                         return false;
1453                 }
1454
1455                 /**
1456                  * Normally, all wiki links are forced to have
1457                  * an initial capital letter so [[foo]] and [[Foo]]
1458                  * point to the same place.
1459                  *
1460                  * Don't force it for interwikis, since the other
1461                  * site might be case-sensitive.
1462                  */
1463                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1464                         $t = $wgContLang->ucfirst( $r );
1465                 } else {
1466                         $t = $r;
1467                 }
1468
1469                 /**
1470                  * Can't make a link to a namespace alone...
1471                  * "empty" local links can only be self-links
1472                  * with a fragment identifier.
1473                  */
1474                 if( $t == '' &&
1475                         $this->mInterwiki == '' &&
1476                         $this->mNamespace != NS_MAIN ) {
1477                         return false;
1478                 }
1479
1480                 # Fill fields
1481                 $this->mDbkeyform = $t;
1482                 $this->mUrlform = wfUrlencode( $t );
1483
1484                 $this->mTextform = str_replace( '_', ' ', $t );
1485
1486                 return true;
1487         }
1488
1489         /**
1490          * Get a Title object associated with the talk page of this article
1491          * @return Title the object for the talk page
1492          * @access public
1493          */
1494         function getTalkPage() {
1495                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1496         }
1497
1498         /**
1499          * Get a title object associated with the subject page of this
1500          * talk page
1501          *
1502          * @return Title the object for the subject page
1503          * @access public
1504          */
1505         function getSubjectPage() {
1506                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1507         }
1508
1509         /**
1510          * Get an array of Title objects linking to this Title
1511          * Also stores the IDs in the link cache.
1512          *
1513          * @param string $options may be FOR UPDATE
1514          * @return array the Title objects linking here
1515          * @access public
1516          */
1517         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1518                 $linkCache =& LinkCache::singleton();
1519                 $id = $this->getArticleID();
1520
1521                 if ( $options ) {
1522                         $db =& wfGetDB( DB_MASTER );
1523                 } else {
1524                         $db =& wfGetDB( DB_SLAVE );
1525                 }
1526
1527                 $res = $db->select( array( 'page', $table ),
1528                         array( 'page_namespace', 'page_title', 'page_id' ),
1529                         array(
1530                                 "{$prefix}_from=page_id",
1531                                 "{$prefix}_namespace" => $this->getNamespace(),
1532                                 "{$prefix}_title"     => $this->getDbKey() ),
1533                         'Title::getLinksTo',
1534                         $options );
1535
1536                 $retVal = array();
1537                 if ( $db->numRows( $res ) ) {
1538                         while ( $row = $db->fetchObject( $res ) ) {
1539                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1540                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1541                                         $retVal[] = $titleObj;
1542                                 }
1543                         }
1544                 }
1545                 $db->freeResult( $res );
1546                 return $retVal;
1547         }
1548
1549         /**
1550          * Get an array of Title objects using this Title as a template
1551          * Also stores the IDs in the link cache.
1552          *
1553          * @param string $options may be FOR UPDATE
1554          * @return array the Title objects linking here
1555          * @access public
1556          */
1557         function getTemplateLinksTo( $options = '' ) {
1558                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1559         }
1560
1561         /**
1562          * Get an array of Title objects referring to non-existent articles linked from this page
1563          *
1564          * @param string $options may be FOR UPDATE
1565          * @return array the Title objects
1566          * @access public
1567          */
1568         function getBrokenLinksFrom( $options = '' ) {
1569                 if ( $options ) {
1570                         $db =& wfGetDB( DB_MASTER );
1571                 } else {
1572                         $db =& wfGetDB( DB_SLAVE );
1573                 }
1574
1575                 $res = $db->safeQuery(
1576                           "SELECT pl_namespace, pl_title
1577                              FROM !
1578                         LEFT JOIN !
1579                                ON pl_namespace=page_namespace
1580                               AND pl_title=page_title
1581                             WHERE pl_from=?
1582                               AND page_namespace IS NULL
1583                                   !",
1584                         $db->tableName( 'pagelinks' ),
1585                         $db->tableName( 'page' ),
1586                         $this->getArticleId(),
1587                         $options );
1588
1589                 $retVal = array();
1590                 if ( $db->numRows( $res ) ) {
1591                         while ( $row = $db->fetchObject( $res ) ) {
1592                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1593                         }
1594                 }
1595                 $db->freeResult( $res );
1596                 return $retVal;
1597         }
1598
1599
1600         /**
1601          * Get a list of URLs to purge from the Squid cache when this
1602          * page changes
1603          *
1604          * @return array the URLs
1605          * @access public
1606          */
1607         function getSquidURLs() {
1608                 return array(
1609                         $this->getInternalURL(),
1610                         $this->getInternalURL( 'action=history' )
1611                 );
1612         }
1613
1614         /**
1615          * Move this page without authentication
1616          * @param Title &$nt the new page Title
1617          * @access public
1618          */
1619         function moveNoAuth( &$nt ) {
1620                 return $this->moveTo( $nt, false );
1621         }
1622
1623         /**
1624          * Check whether a given move operation would be valid.
1625          * Returns true if ok, or a message key string for an error message
1626          * if invalid. (Scarrrrry ugly interface this.)
1627          * @param Title &$nt the new title
1628          * @param bool $auth indicates whether $wgUser's permissions
1629          *      should be checked
1630          * @return mixed true on success, message name on failure
1631          * @access public
1632          */
1633         function isValidMoveOperation( &$nt, $auth = true ) {
1634                 global $wgUser;
1635                 if( !$this or !$nt ) {
1636                         return 'badtitletext';
1637                 }
1638                 if( $this->equals( $nt ) ) {
1639                         return 'selfmove';
1640                 }
1641                 if( !$this->isMovable() || !$nt->isMovable() ) {
1642                         return 'immobile_namespace';
1643                 }
1644
1645                 $oldid = $this->getArticleID();
1646                 $newid = $nt->getArticleID();
1647
1648                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1649                         return 'articleexists';
1650                 }
1651                 if ( ( '' == $this->getDBkey() ) ||
1652                          ( !$oldid ) ||
1653                      ( '' == $nt->getDBkey() ) ) {
1654                         return 'badarticleerror';
1655                 }
1656
1657                 if ( $auth && (
1658                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1659                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1660                         return 'protectedpage';
1661                 }
1662
1663                 # The move is allowed only if (1) the target doesn't exist, or
1664                 # (2) the target is a redirect to the source, and has no history
1665                 # (so we can undo bad moves right after they're done).
1666
1667                 if ( 0 != $newid ) { # Target exists; check for validity
1668                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1669                                 return 'articleexists';
1670                         }
1671                 }
1672                 return true;
1673         }
1674
1675         /**
1676          * Move a title to a new location
1677          * @param Title &$nt the new title
1678          * @param bool $auth indicates whether $wgUser's permissions
1679          *      should be checked
1680          * @return mixed true on success, message name on failure
1681          * @access public
1682          */
1683         function moveTo( &$nt, $auth = true, $reason = '' ) {
1684                 $err = $this->isValidMoveOperation( $nt, $auth );
1685                 if( is_string( $err ) ) {
1686                         return $err;
1687                 }
1688
1689                 $pageid = $this->getArticleID();
1690                 if( $nt->exists() ) {
1691                         $this->moveOverExistingRedirect( $nt, $reason );
1692                         $pageCountChange = 0;
1693                 } else { # Target didn't exist, do normal move.
1694                         $this->moveToNewTitle( $nt, $reason );
1695                         $pageCountChange = 1;
1696                 }
1697                 $redirid = $this->getArticleID();
1698
1699                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1700                 $dbw =& wfGetDB( DB_MASTER );
1701                 $categorylinks = $dbw->tableName( 'categorylinks' );
1702                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1703                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1704                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1705                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1706
1707                 # Update watchlists
1708
1709                 $oldnamespace = $this->getNamespace() & ~1;
1710                 $newnamespace = $nt->getNamespace() & ~1;
1711                 $oldtitle = $this->getDBkey();
1712                 $newtitle = $nt->getDBkey();
1713
1714                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1715                         WatchedItem::duplicateEntries( $this, $nt );
1716                 }
1717
1718                 # Update search engine
1719                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1720                 $u->doUpdate();
1721                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1722                 $u->doUpdate();
1723
1724                 # Update site_stats
1725                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1726                         # Moved out of main namespace
1727                         # not viewed, edited, removing
1728                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1729                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1730                         # Moved into main namespace
1731                         # not viewed, edited, adding
1732                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1733                 } elseif ( $pageCountChange ) {
1734                         # Added redirect
1735                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1736                 } else{
1737                         $u = false;
1738                 }
1739                 if ( $u ) {
1740                         $u->doUpdate();
1741                 }
1742
1743                 global $wgUser;
1744                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1745                 return true;
1746         }
1747
1748         /**
1749          * Move page to a title which is at present a redirect to the
1750          * source page
1751          *
1752          * @param Title &$nt the page to move to, which should currently
1753          *      be a redirect
1754          * @access private
1755          */
1756         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1757                 global $wgUser, $wgUseSquid, $wgMwRedir;
1758                 $fname = 'Title::moveOverExistingRedirect';
1759                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1760
1761                 if ( $reason ) {
1762                         $comment .= ": $reason";
1763                 }
1764
1765                 $now = wfTimestampNow();
1766                 $rand = wfRandom();
1767                 $newid = $nt->getArticleID();
1768                 $oldid = $this->getArticleID();
1769                 $dbw =& wfGetDB( DB_MASTER );
1770                 $linkCache =& LinkCache::singleton();
1771
1772                 # Delete the old redirect. We don't save it to history since
1773                 # by definition if we've got here it's rather uninteresting.
1774                 # We have to remove it so that the next step doesn't trigger
1775                 # a conflict on the unique namespace+title index...
1776                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1777
1778                 # Save a null revision in the page's history notifying of the move
1779                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1780                 $nullRevId = $nullRevision->insertOn( $dbw );
1781
1782                 # Change the name of the target page:
1783                 $dbw->update( 'page',
1784                         /* SET */ array(
1785                                 'page_touched'   => $dbw->timestamp($now),
1786                                 'page_namespace' => $nt->getNamespace(),
1787                                 'page_title'     => $nt->getDBkey(),
1788                                 'page_latest'    => $nullRevId,
1789                         ),
1790                         /* WHERE */ array( 'page_id' => $oldid ),
1791                         $fname
1792                 );
1793                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1794
1795                 # Recreate the redirect, this time in the other direction.
1796                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1797                 $redirectArticle = new Article( $this );
1798                 $newid = $redirectArticle->insertOn( $dbw );
1799                 $redirectRevision = new Revision( array(
1800                         'page'    => $newid,
1801                         'comment' => $comment,
1802                         'text'    => $redirectText ) );
1803                 $revid = $redirectRevision->insertOn( $dbw );
1804                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1805                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1806
1807                 # Log the move
1808                 $log = new LogPage( 'move' );
1809                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1810
1811                 # Now, we record the link from the redirect to the new title.
1812                 # It should have no other outgoing links...
1813                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1814                 $dbw->insert( 'pagelinks',
1815                         array(
1816                                 'pl_from'      => $newid,
1817                                 'pl_namespace' => $nt->getNamespace(),
1818                                 'pl_title'     => $nt->getDbKey() ),
1819                         $fname );
1820
1821                 # Purge squid
1822                 if ( $wgUseSquid ) {
1823                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1824                         $u = new SquidUpdate( $urls );
1825                         $u->doUpdate();
1826                 }
1827         }
1828
1829         /**
1830          * Move page to non-existing title.
1831          * @param Title &$nt the new Title
1832          * @access private
1833          */
1834         function moveToNewTitle( &$nt, $reason = '' ) {
1835                 global $wgUser, $wgUseSquid;
1836                 global $wgMwRedir;
1837                 $fname = 'MovePageForm::moveToNewTitle';
1838                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1839                 if ( $reason ) {
1840                         $comment .= ": $reason";
1841                 }
1842
1843                 $newid = $nt->getArticleID();
1844                 $oldid = $this->getArticleID();
1845                 $dbw =& wfGetDB( DB_MASTER );
1846                 $now = $dbw->timestamp();
1847                 $rand = wfRandom();
1848                 $linkCache =& LinkCache::singleton();
1849
1850                 # Save a null revision in the page's history notifying of the move
1851                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1852                 $nullRevId = $nullRevision->insertOn( $dbw );
1853
1854                 # Rename cur entry
1855                 $dbw->update( 'page',
1856                         /* SET */ array(
1857                                 'page_touched'   => $now,
1858                                 'page_namespace' => $nt->getNamespace(),
1859                                 'page_title'     => $nt->getDBkey(),
1860                                 'page_latest'    => $nullRevId,
1861                         ),
1862                         /* WHERE */ array( 'page_id' => $oldid ),
1863                         $fname
1864                 );
1865
1866                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1867
1868                 # Insert redirect
1869                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1870                 $redirectArticle = new Article( $this );
1871                 $newid = $redirectArticle->insertOn( $dbw );
1872                 $redirectRevision = new Revision( array(
1873                         'page'    => $newid,
1874                         'comment' => $comment,
1875                         'text'    => $redirectText ) );
1876                 $revid = $redirectRevision->insertOn( $dbw );
1877                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1878                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1879
1880                 # Log the move
1881                 $log = new LogPage( 'move' );
1882                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1883
1884                 # Purge caches as per article creation
1885                 Article::onArticleCreate( $nt );
1886
1887                 # Record the just-created redirect's linking to the page
1888                 $dbw->insert( 'pagelinks',
1889                         array(
1890                                 'pl_from'      => $newid,
1891                                 'pl_namespace' => $nt->getNamespace(),
1892                                 'pl_title'     => $nt->getDBkey() ),
1893                         $fname );
1894
1895                 # Non-existent target may have had broken links to it; these must
1896                 # now be touched to update link coloring.
1897                 $nt->touchLinks();
1898
1899                 # Purge old title from squid
1900                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1901                 $titles = $nt->getLinksTo();
1902                 if ( $wgUseSquid ) {
1903                         $urls = $this->getSquidURLs();
1904                         foreach ( $titles as $linkTitle ) {
1905                                 $urls[] = $linkTitle->getInternalURL();
1906                         }
1907                         $u = new SquidUpdate( $urls );
1908                         $u->doUpdate();
1909                 }
1910         }
1911
1912         /**
1913          * Checks if $this can be moved to a given Title
1914          * - Selects for update, so don't call it unless you mean business
1915          *
1916          * @param Title &$nt the new title to check
1917          * @access public
1918          */
1919         function isValidMoveTarget( $nt ) {
1920
1921                 $fname = 'Title::isValidMoveTarget';
1922                 $dbw =& wfGetDB( DB_MASTER );
1923
1924                 # Is it a redirect?
1925                 $id  = $nt->getArticleID();
1926                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1927                         array( 'page_is_redirect','old_text','old_flags' ),
1928                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1929                         $fname, 'FOR UPDATE' );
1930
1931                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1932                         # Not a redirect
1933                         return false;
1934                 }
1935                 $text = Revision::getRevisionText( $obj );
1936
1937                 # Does the redirect point to the source?
1938                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1939                         $redirTitle = Title::newFromText( $m[1] );
1940                         if( !is_object( $redirTitle ) ||
1941                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1942                                 return false;
1943                         }
1944                 } else {
1945                         # Fail safe
1946                         return false;
1947                 }
1948
1949                 # Does the article have a history?
1950                 $row = $dbw->selectRow( array( 'page', 'revision'),
1951                         array( 'rev_id' ),
1952                         array( 'page_namespace' => $nt->getNamespace(),
1953                                 'page_title' => $nt->getDBkey(),
1954                                 'page_id=rev_page AND page_latest != rev_id'
1955                         ), $fname, 'FOR UPDATE'
1956                 );
1957
1958                 # Return true if there was no history
1959                 return $row === false;
1960         }
1961
1962         /**
1963          * Create a redirect; fails if the title already exists; does
1964          * not notify RC
1965          *
1966          * @param Title $dest the destination of the redirect
1967          * @param string $comment the comment string describing the move
1968          * @return bool true on success
1969          * @access public
1970          */
1971         function createRedirect( $dest, $comment ) {
1972                 global $wgUser;
1973                 if ( $this->getArticleID() ) {
1974                         return false;
1975                 }
1976
1977                 $fname = 'Title::createRedirect';
1978                 $dbw =& wfGetDB( DB_MASTER );
1979
1980                 $article = new Article( $this );
1981                 $newid = $article->insertOn( $dbw );
1982                 $revision = new Revision( array(
1983                         'page'      => $newid,
1984                         'comment'   => $comment,
1985                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1986                         ) );
1987                 $revisionId = $revision->insertOn( $dbw );
1988                 $article->updateRevisionOn( $dbw, $revision, 0 );
1989
1990                 # Link table
1991                 $dbw->insert( 'pagelinks',
1992                         array(
1993                                 'pl_from'      => $newid,
1994                                 'pl_namespace' => $dest->getNamespace(),
1995                                 'pl_title'     => $dest->getDbKey()
1996                         ), $fname
1997                 );
1998
1999                 Article::onArticleCreate( $this );
2000                 return true;
2001         }
2002
2003         /**
2004          * Get categories to which this Title belongs and return an array of
2005          * categories' names.
2006          *
2007          * @return array an array of parents in the form:
2008          *      $parent => $currentarticle
2009          * @access public
2010          */
2011         function getParentCategories() {
2012                 global $wgContLang,$wgUser;
2013
2014                 $titlekey = $this->getArticleId();
2015                 $dbr =& wfGetDB( DB_SLAVE );
2016                 $categorylinks = $dbr->tableName( 'categorylinks' );
2017
2018                 # NEW SQL
2019                 $sql = "SELECT * FROM $categorylinks"
2020                      ." WHERE cl_from='$titlekey'"
2021                          ." AND cl_from <> '0'"
2022                          ." ORDER BY cl_sortkey";
2023
2024                 $res = $dbr->query ( $sql ) ;
2025
2026                 if($dbr->numRows($res) > 0) {
2027                         while ( $x = $dbr->fetchObject ( $res ) )
2028                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2029                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2030                         $dbr->freeResult ( $res ) ;
2031                 } else {
2032                         $data = '';
2033                 }
2034                 return $data;
2035         }
2036
2037         /**
2038          * Get a tree of parent categories
2039          * @param array $children an array with the children in the keys, to check for circular refs
2040          * @return array
2041          * @access public
2042          */
2043         function getParentCategoryTree( $children = array() ) {
2044                 $parents = $this->getParentCategories();
2045
2046                 if($parents != '') {
2047                         foreach($parents as $parent => $current) {
2048                                 if ( array_key_exists( $parent, $children ) ) {
2049                                         # Circular reference
2050                                         $stack[$parent] = array();
2051                                 } else {
2052                                         $nt = Title::newFromText($parent);
2053                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2054                                 }
2055                         }
2056                         return $stack;
2057                 } else {
2058                         return array();
2059                 }
2060         }
2061
2062
2063         /**
2064          * Get an associative array for selecting this title from
2065          * the "page" table
2066          *
2067          * @return array
2068          * @access public
2069          */
2070         function pageCond() {
2071                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2072         }
2073
2074         /**
2075          * Get the revision ID of the previous revision
2076          *
2077          * @param integer $revision  Revision ID. Get the revision that was before this one.
2078          * @return interger $oldrevision|false
2079          */
2080         function getPreviousRevisionID( $revision ) {
2081                 $dbr =& wfGetDB( DB_SLAVE );
2082                 return $dbr->selectField( 'revision', 'rev_id',
2083                         'rev_page=' . intval( $this->getArticleId() ) .
2084                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2085         }
2086
2087         /**
2088          * Get the revision ID of the next revision
2089          *
2090          * @param integer $revision  Revision ID. Get the revision that was after this one.
2091          * @return interger $oldrevision|false
2092          */
2093         function getNextRevisionID( $revision ) {
2094                 $dbr =& wfGetDB( DB_SLAVE );
2095                 return $dbr->selectField( 'revision', 'rev_id',
2096                         'rev_page=' . intval( $this->getArticleId() ) .
2097                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2098         }
2099
2100         /**
2101          * Compare with another title.
2102          *
2103          * @param Title $title
2104          * @return bool
2105          */
2106         function equals( $title ) {
2107                 // Note: === is necessary for proper matching of number-like titles.
2108                 return $this->getInterwiki() === $title->getInterwiki()
2109                         && $this->getNamespace() == $title->getNamespace()
2110                         && $this->getDbkey() === $title->getDbkey();
2111         }
2112
2113         /**
2114          * Check if page exists
2115          * @return bool
2116          */
2117         function exists() {
2118                 return $this->getArticleId() != 0;
2119         }
2120
2121         /**
2122          * Should a link should be displayed as a known link, just based on its title?
2123          *
2124          * Currently, a self-link with a fragment and special pages are in
2125          * this category. Special pages never exist in the database.
2126          */
2127         function isAlwaysKnown() {
2128                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2129                   || NS_SPECIAL == $this->mNamespace;
2130         }
2131
2132         /**
2133          * Update page_touched timestamps on pages linking to this title.
2134          * In principal, this could be backgrounded and could also do squid
2135          * purging.
2136          */
2137         function touchLinks() {
2138                 $fname = 'Title::touchLinks';
2139
2140                 $dbw =& wfGetDB( DB_MASTER );
2141
2142                 $res = $dbw->select( 'pagelinks',
2143                         array( 'pl_from' ),
2144                         array(
2145                                 'pl_namespace' => $this->getNamespace(),
2146                                 'pl_title'     => $this->getDbKey() ),
2147                         $fname );
2148
2149                 $toucharr = array();
2150                 while( $row = $dbw->fetchObject( $res ) ) {
2151                         $toucharr[] = $row->pl_from;
2152                 }
2153                 $dbw->freeResult( $res );
2154
2155                 if( $this->getNamespace() == NS_CATEGORY ) {
2156                         // Categories show up in a separate set of links as well
2157                         $res = $dbw->select( 'categorylinks',
2158                                 array( 'cl_from' ),
2159                                 array( 'cl_to' => $this->getDbKey() ),
2160                                 $fname );
2161                         while( $row = $dbw->fetchObject( $res ) ) {
2162                                 $toucharr[] = $row->cl_from;
2163                         }
2164                         $dbw->freeResult( $res );
2165                 }
2166
2167                 if (!count($toucharr))
2168                         return;
2169                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2170                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2171         }
2172
2173         function trackbackURL() {
2174                 global $wgTitle, $wgScriptPath, $wgServer;
2175
2176                 return "$wgServer$wgScriptPath/trackback.php?article="
2177                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2178         }
2179
2180         function trackbackRDF() {
2181                 $url = htmlspecialchars($this->getFullURL());
2182                 $title = htmlspecialchars($this->getText());
2183                 $tburl = $this->trackbackURL();
2184
2185                 return "
2186 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2187          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2188          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2189 <rdf:Description
2190    rdf:about=\"$url\"
2191    dc:identifier=\"$url\"
2192    dc:title=\"$title\"
2193    trackback:ping=\"$tburl\" />
2194 </rdf:RDF>";
2195         }
2196 }
2197 ?>