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