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 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 /**
  22  * Title class
  23  * - Represents a title, which may contain an interwiki designation or namespace
  24  * - Can fetch various kinds of data from the database, albeit inefficiently.
  25  *
  26  * @package MediaWiki
  27  */
  28 class Title {
  29         /**
  30          * All member variables should be considered private
  31          * Please use the accessor functions
  32          */
  33
  34          /**#@+
  35          * @access private
  36          */
  37
  38         var $mTextform;           # Text form (spaces not underscores) of the main part
  39         var $mUrlform;            # URL-encoded form of the main part
  40         var $mDbkeyform;          # Main part with underscores
  41         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  42         var $mInterwiki;          # Interwiki prefix (or null string)
  43         var $mFragment;           # Title fragment (i.e. the bit after the #)
  44         var $mArticleID;          # Article ID, fetched from the link cache on demand
  45         var $mLatestID;         # ID of most recent revision
  46         var $mRestrictions;       # Array of groups allowed to edit this article
  47                               # Only null or "sysop" are supported
  48         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  49         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  50         var $mDefaultNamespace;   # Namespace index when there is no namespace
  51                               # Zero except in {{transclusion}} tags
  52         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  53         /**#@-*/
  54
  55
  56         /**
  57          * Constructor
  58          * @access private
  59          */
  60         /* private */ function Title() {
  61                 $this->mInterwiki = $this->mUrlform =
  62                 $this->mTextform = $this->mDbkeyform = '';
  63                 $this->mArticleID = -1;
  64                 $this->mNamespace = NS_MAIN;
  65                 $this->mRestrictionsLoaded = false;
  66                 $this->mRestrictions = array();
  67                 # Dont change the following, NS_MAIN is hardcoded in several place
  68                 # See bug #696
  69                 $this->mDefaultNamespace = NS_MAIN;
  70                 $this->mWatched = NULL;
  71                 $this->mLatestID = false;
  72         }
  73
  74         /**
  75          * Create a new Title from a prefixed DB key
  76          * @param string $key The database key, which has underscores
  77          *      instead of spaces, possibly including namespace and
  78          *      interwiki prefixes
  79          * @return Title the new object, or NULL on an error
  80          * @static
  81          * @access public
  82          */
  83         /* static */ function newFromDBkey( $key ) {
  84                 $t = new Title();
  85                 $t->mDbkeyform = $key;
  86                 if( $t->secureAndSplit() )
  87                         return $t;
  88                 else
  89                         return NULL;
  90         }
  91
  92         /**
  93          * Create a new Title from text, such as what one would
  94          * find in a link. Decodes any HTML entities in the text.
  95          *
  96          * @param string $text the link text; spaces, prefixes,
  97          *      and an initial ':' indicating the main namespace
  98          *      are accepted
  99          * @param int $defaultNamespace the namespace to use if
 100          *      none is specified by a prefix
 101          * @return Title the new object, or NULL on an error
 102          * @static
 103          * @access public
 104          */
 105         function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 106                 $fname = 'Title::newFromText';
 107                 wfProfileIn( $fname );
 108
 109                 if( is_object( $text ) ) {
 110                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 111                 }
 112
 113                 /**
 114                  * Wiki pages often contain multiple links to the same page.
 115                  * Title normalization and parsing can become expensive on
 116                  * pages with many links, so we can save a little time by
 117                  * caching them.
 118                  *
 119                  * In theory these are value objects and won't get changed...
 120                  */
 121                 static $titleCache = array();
 122                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 123                         wfProfileOut( $fname );
 124                         return $titleCache[$text];
 125                 }
 126
 127                 /**
 128                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 129                  */
 130                 $filteredText = Sanitizer::decodeCharReferences( $text );
 131
 132                 $t =& new Title();
 133                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 134                 $t->mDefaultNamespace = $defaultNamespace;
 135
 136                 if( $t->secureAndSplit() ) {
 137                         if( $defaultNamespace == NS_MAIN ) {
 138                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 139                                         # Avoid memory leaks on mass operations...
 140                                         $titleCache = array();
 141                                 }
 142                                 $titleCache[$text] =& $t;
 143                         }
 144                         wfProfileOut( $fname );
 145                         return $t;
 146                 } else {
 147                         wfProfileOut( $fname );
 148                         return NULL;
 149                 }
 150         }
 151
 152         /**
 153          * Create a new Title from URL-encoded text. Ensures that
 154          * the given title's length does not exceed the maximum.
 155          * @param string $url the title, as might be taken from a URL
 156          * @return Title the new object, or NULL on an error
 157          * @static
 158          * @access public
 159          */
 160         function newFromURL( $url ) {
 161                 global $wgLang, $wgServer;
 162                 $t = new Title();
 163
 164                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 165                 # but some URLs used it as a space replacement and they still come
 166                 # from some external search tools.
 167                 $s = str_replace( '+', ' ', $url );
 168
 169                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 170                 if( $t->secureAndSplit() ) {
 171                         return $t;
 172                 } else {
 173                         return NULL;
 174                 }
 175         }
 176
 177         /**
 178          * Create a new Title from an article ID
 179          *
 180          * @todo This is inefficiently implemented, the page row is requested
 181          *       but not used for anything else
 182          *
 183          * @param int $id the page_id corresponding to the Title to create
 184          * @return Title the new object, or NULL on an error
 185          * @access public
 186          * @static
 187          */
 188         function newFromID( $id ) {
 189                 $fname = 'Title::newFromID';
 190                 $dbr =& wfGetDB( DB_SLAVE );
 191                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 192                         array( 'page_id' => $id ), $fname );
 193                 if ( $row !== false ) {
 194                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 195                 } else {
 196                         $title = NULL;
 197                 }
 198                 return $title;
 199         }
 200
 201         /**
 202          * Create a new Title from a namespace index and a DB key.
 203          * It's assumed that $ns and $title are *valid*, for instance when
 204          * they came directly from the database or a special page name.
 205          * For convenience, spaces are converted to underscores so that
 206          * eg user_text fields can be used directly.
 207          *
 208          * @param int $ns the namespace of the article
 209          * @param string $title the unprefixed database key form
 210          * @return Title the new object
 211          * @static
 212          * @access public
 213          */
 214         function &makeTitle( $ns, $title ) {
 215                 $t =& new Title();
 216                 $t->mInterwiki = '';
 217                 $t->mFragment = '';
 218                 $t->mNamespace = IntVal( $ns );
 219                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 220                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 221                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 222                 $t->mTextform = str_replace( '_', ' ', $title );
 223                 return $t;
 224         }
 225
 226         /**
 227          * Create a new Title frrom a namespace index and a DB key.
 228          * The parameters will be checked for validity, which is a bit slower
 229          * than makeTitle() but safer for user-provided data.
 230          *
 231          * @param int $ns the namespace of the article
 232          * @param string $title the database key form
 233          * @return Title the new object, or NULL on an error
 234          * @static
 235          * @access public
 236          */
 237         function makeTitleSafe( $ns, $title ) {
 238                 $t = new Title();
 239                 $t->mDbkeyform = Title::makeName( $ns, $title );
 240                 if( $t->secureAndSplit() ) {
 241                         return $t;
 242                 } else {
 243                         return NULL;
 244                 }
 245         }
 246
 247         /**
 248          * Create a new Title for the Main Page
 249          *
 250          * @static
 251          * @return Title the new object
 252          * @access public
 253          */
 254         function newMainPage() {
 255                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 256         }
 257
 258         /**
 259          * Create a new Title for a redirect
 260          * @param string $text the redirect title text
 261          * @return Title the new object, or NULL if the text is not a
 262          *      valid redirect
 263          * @static
 264          * @access public
 265          */
 266         function newFromRedirect( $text ) {
 267                 global $wgMwRedir;
 268                 $rt = NULL;
 269                 if ( $wgMwRedir->matchStart( $text ) ) {
 270                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 271                                 # categories are escaped using : for example one can enter:
 272                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 273                                 if ( substr($m[1],0,1) == ':') {
 274                                         # We don't want to keep the ':'
 275                                         $m[1] = substr( $m[1], 1 );
 276                                 }
 277
 278                                 $rt = Title::newFromText( $m[1] );
 279                                 # Disallow redirects to Special:Userlogout
 280                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 281                                         $rt = NULL;
 282                                 }
 283                         }
 284                 }
 285                 return $rt;
 286         }
 287
 288 #----------------------------------------------------------------------------
 289 #       Static functions
 290 #----------------------------------------------------------------------------
 291
 292         /**
 293          * Get the prefixed DB key associated with an ID
 294          * @param int $id the page_id of the article
 295          * @return Title an object representing the article, or NULL
 296          *      if no such article was found
 297          * @static
 298          * @access public
 299          */
 300         function nameOf( $id ) {
 301                 $fname = 'Title::nameOf';
 302                 $dbr =& wfGetDB( DB_SLAVE );
 303
 304                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 305                 if ( $s === false ) { return NULL; }
 306
 307                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 308                 return $n;
 309         }
 310
 311         /**
 312          * Get a regex character class describing the legal characters in a link
 313          * @return string the list of characters, not delimited
 314          * @static
 315          * @access public
 316          */
 317         function legalChars() {
 318                 # Missing characters:
 319                 #  * []|# Needed for link syntax
 320                 #  * % and + are corrupted by Apache when they appear in the path
 321                 #
 322                 # % seems to work though
 323                 #
 324                 # The problem with % is that URLs are double-unescaped: once by Apache's
 325                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 326                 # Our code does not double-escape to compensate for this, indeed double escaping
 327                 # would break if the double-escaped title was passed in the query string
 328                 # rather than the path. This is a minor security issue because articles can be
 329                 # created such that they are hard to view or edit. -- TS
 330                 #
 331                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 332                 # this breaks interlanguage links
 333
 334                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 335                 return $set;
 336         }
 337
 338         /**
 339          * Get a string representation of a title suitable for
 340          * including in a search index
 341          *
 342          * @param int $ns a namespace index
 343          * @param string $title text-form main part
 344          * @return string a stripped-down title string ready for the
 345          *      search index
 346          */
 347         /* static */ function indexTitle( $ns, $title ) {
 348                 global $wgDBminWordLen, $wgContLang;
 349                 require_once( 'SearchEngine.php' );
 350
 351                 $lc = SearchEngine::legalSearchChars() . '&#;';
 352                 $t = $wgContLang->stripForSearch( $title );
 353                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 354                 $t = strtolower( $t );
 355
 356                 # Handle 's, s'
 357                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 358                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 359
 360                 $t = preg_replace( "/\\s+/", ' ', $t );
 361
 362                 if ( $ns == NS_IMAGE ) {
 363                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 364                 }
 365                 return trim( $t );
 366         }
 367
 368         /*
 369          * Make a prefixed DB key from a DB key and a namespace index
 370          * @param int $ns numerical representation of the namespace
 371          * @param string $title the DB key form the title
 372          * @return string the prefixed form of the title
 373          */
 374         /* static */ function makeName( $ns, $title ) {
 375                 global $wgContLang;
 376
 377                 $n = $wgContLang->getNsText( $ns );
 378                 return $n == '' ? $title : "$n:$title";
 379         }
 380
 381         /**
 382          * Returns the URL associated with an interwiki prefix
 383          * @param string $key the interwiki prefix (e.g. "MeatBall")
 384          * @return the associated URL, containing "$1", which should be
 385          *      replaced by an article title
 386          * @static (arguably)
 387          * @access public
 388          */
 389         function getInterwikiLink( $key, $transludeonly = false ) {
 390                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 391                 $fname = 'Title::getInterwikiLink';
 392
 393                 wfProfileIn( $fname );
 394
 395                 $k = $wgDBname.':interwiki:'.$key;
 396                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 397                         wfProfileOut( $fname );
 398                         return $wgTitleInterwikiCache[$k]->iw_url;
 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          * Determine whether the object refers to a page within
 435          * this project.
 436          *
 437          * @return bool TRUE if this is an in-project interwiki link
 438          *      or a wikilink, FALSE otherwise
 439          * @access public
 440          */
 441         function isLocal() {
 442                 global $wgTitleInterwikiCache, $wgDBname;
 443
 444                 if ( $this->mInterwiki != '' ) {
 445                         # Make sure key is loaded into cache
 446                         $this->getInterwikiLink( $this->mInterwiki );
 447                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 448                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 449                 } else {
 450                         return true;
 451                 }
 452         }
 453
 454         /**
 455          * Determine whether the object refers to a page within
 456          * this project and is transcludable.
 457          *
 458          * @return bool TRUE if this is transcludable
 459          * @access public
 460          */
 461         function isTrans() {
 462                 global $wgTitleInterwikiCache, $wgDBname;
 463
 464                 if ($this->mInterwiki == '' || !$this->isLocal())
 465                         return false;
 466                 # Make sure key is loaded into cache
 467                 $this->getInterwikiLink( $this->mInterwiki );
 468                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 469                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 470         }
 471
 472         /**
 473          * Update the page_touched field for an array of title objects
 474          * @todo Inefficient unless the IDs are already loaded into the
 475          *      link cache
 476          * @param array $titles an array of Title objects to be touched
 477          * @param string $timestamp the timestamp to use instead of the
 478          *      default current time
 479          * @static
 480          * @access public
 481          */
 482         function touchArray( $titles, $timestamp = '' ) {
 483                 global $wgUseFileCache;
 484
 485                 if ( count( $titles ) == 0 ) {
 486                         return;
 487                 }
 488                 $dbw =& wfGetDB( DB_MASTER );
 489                 if ( $timestamp == '' ) {
 490                         $timestamp = $dbw->timestamp();
 491                 }
 492                 $page = $dbw->tableName( 'page' );
 493                 /*
 494                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 495                 $first = true;
 496
 497                 foreach ( $titles as $title ) {
 498                         if ( $wgUseFileCache ) {
 499                                 $cm = new CacheManager($title);
 500                                 @unlink($cm->fileCacheName());
 501                         }
 502
 503                         if ( ! $first ) {
 504                                 $sql .= ',';
 505                         }
 506                         $first = false;
 507                         $sql .= $title->getArticleID();
 508                 }
 509                 $sql .= ')';
 510                 if ( ! $first ) {
 511                         $dbw->query( $sql, 'Title::touchArray' );
 512                 }
 513                 */
 514                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 515                 // do them in small chunks:
 516                 $fname = 'Title::touchArray';
 517                 foreach( $titles as $title ) {
 518                         $dbw->update( 'page',
 519                                 array( 'page_touched' => $timestamp ),
 520                                 array(
 521                                         'page_namespace' => $title->getNamespace(),
 522                                         'page_title'     => $title->getDBkey() ),
 523                                 $fname );
 524                 }
 525         }
 526
 527 #----------------------------------------------------------------------------
 528 #       Other stuff
 529 #----------------------------------------------------------------------------
 530
 531         /** Simple accessors */
 532         /**
 533          * Get the text form (spaces not underscores) of the main part
 534          * @return string
 535          * @access public
 536          */
 537         function getText() { return $this->mTextform; }
 538         /**
 539          * Get the URL-encoded form of the main part
 540          * @return string
 541          * @access public
 542          */
 543         function getPartialURL() { return $this->mUrlform; }
 544         /**
 545          * Get the main part with underscores
 546          * @return string
 547          * @access public
 548          */
 549         function getDBkey() { return $this->mDbkeyform; }
 550         /**
 551          * Get the namespace index, i.e. one of the NS_xxxx constants
 552          * @return int
 553          * @access public
 554          */
 555         function getNamespace() { return $this->mNamespace; }
 556         /**
 557          * Get the interwiki prefix (or null string)
 558          * @return string
 559          * @access public
 560          */
 561         function getInterwiki() { return $this->mInterwiki; }
 562         /**
 563          * Get the Title fragment (i.e. the bit after the #)
 564          * @return string
 565          * @access public
 566          */
 567         function getFragment() { return $this->mFragment; }
 568         /**
 569          * Get the default namespace index, for when there is no namespace
 570          * @return int
 571          * @access public
 572          */
 573         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 574
 575         /**
 576          * Get title for search index
 577          * @return string a stripped-down title string ready for the
 578          *      search index
 579          */
 580         function getIndexTitle() {
 581                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 582         }
 583
 584         /**
 585          * Get the prefixed database key form
 586          * @return string the prefixed title, with underscores and
 587          *      any interwiki and namespace prefixes
 588          * @access public
 589          */
 590         function getPrefixedDBkey() {
 591                 $s = $this->prefix( $this->mDbkeyform );
 592                 $s = str_replace( ' ', '_', $s );
 593                 return $s;
 594         }
 595
 596         /**
 597          * Get the prefixed title with spaces.
 598          * This is the form usually used for display
 599          * @return string the prefixed title, with spaces
 600          * @access public
 601          */
 602         function getPrefixedText() {
 603                 global $wgContLang;
 604                 if ( empty( $this->mPrefixedText ) ) {
 605                         $s = $this->prefix( $this->mTextform );
 606                         $s = str_replace( '_', ' ', $s );
 607                         $this->mPrefixedText = $s;
 608                 }
 609                 return $this->mPrefixedText;
 610         }
 611
 612         /**
 613          * Get the prefixed title with spaces, plus any fragment
 614          * (part beginning with '#')
 615          * @return string the prefixed title, with spaces and
 616          *      the fragment, including '#'
 617          * @access public
 618          */
 619         function getFullText() {
 620                 global $wgContLang;
 621                 $text = $this->getPrefixedText();
 622                 if( '' != $this->mFragment ) {
 623                         $text .= '#' . $this->mFragment;
 624                 }
 625                 return $text;
 626         }
 627
 628         /**
 629          * Get a URL-encoded title (not an actual URL) including interwiki
 630          * @return string the URL-encoded form
 631          * @access public
 632          */
 633         function getPrefixedURL() {
 634                 $s = $this->prefix( $this->mDbkeyform );
 635                 $s = str_replace( ' ', '_', $s );
 636
 637                 $s = wfUrlencode ( $s ) ;
 638
 639                 # Cleaning up URL to make it look nice -- is this safe?
 640                 $s = str_replace( '%28', '(', $s );
 641                 $s = str_replace( '%29', ')', $s );
 642
 643                 return $s;
 644         }
 645
 646         /**
 647          * Get a real URL referring to this title, with interwiki link and
 648          * fragment
 649          *
 650          * @param string $query an optional query string, not used
 651          *      for interwiki links
 652          * @return string the URL
 653          * @access public
 654          */
 655         function getFullURL( $query = '' ) {
 656                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 657
 658                 if ( '' == $this->mInterwiki ) {
 659                         return $wgServer . $this->getLocalUrl( $query );
 660                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 661                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 662                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 663                 } else {
 664                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 665                 }
 666
 667                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 668                 if ( '' != $namespace ) {
 669                         # Can this actually happen? Interwikis shouldn't be parsed.
 670                         $namepace .= ':';
 671                 }
 672                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 673                 if( $query != '' ) {
 674                         if( false === strpos( $url, '?' ) ) {
 675                                 $url .= '?';
 676                         } else {
 677                                 $url .= '&';
 678                         }
 679                         $url .= $query;
 680                 }
 681                 if ( '' != $this->mFragment ) {
 682                         $url .= '#' . $this->mFragment;
 683                 }
 684                 return $url;
 685         }
 686
 687         /**
 688          * Get a relative directory for putting an HTML version of this article into
 689          */
 690         function getHashedDirectory() {
 691                 global $wgMakeDumpLinks, $wgInputEncoding;
 692                 $dbkey = $this->getDBkey();
 693
 694                 # Split into characters
 695                 if ( $wgInputEncoding == 'UTF-8' ) {
 696                         preg_match_all( '/./us', $dbkey, $m );
 697                 } else {
 698                         preg_match_all( '/./s', $dbkey, $m );
 699                 }
 700                 $chars = $m[0];
 701                 $length = count( $chars );
 702                 $dir = '';
 703
 704                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 705                         if ( $i ) {
 706                                 $dir .= '/';
 707                         }
 708                         if ( $i >= $length ) {
 709                                 $dir .= '_';
 710                         } elseif ( ord( $chars[$i] ) > 32 ) {
 711                                 $dir .= strtolower( $chars[$i] );
 712                         } else {
 713                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 714                         }
 715                 }
 716                 return $dir;
 717         }
 718
 719         function getHashedFilename() {
 720                 $dbkey = $this->getPrefixedDBkey();
 721                 $mainPage = Title::newMainPage();
 722                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 723                         return 'index.html';
 724                 }
 725
 726                 $dir = $this->getHashedDirectory();
 727
 728                 # Replace illegal charcters for Windows paths with underscores
 729                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 730
 731                 # Work out lower case form. We assume we're on a system with case-insensitive
 732                 # filenames, so unless the case is of a special form, we have to disambiguate
 733                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 734
 735                 # Make it mostly unique
 736                 if ( $lowerCase != $friendlyName  ) {
 737                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 738                 }
 739                 # Handle colon specially by replacing it with tilde
 740                 # Thus we reduce the number of paths with hashes appended
 741                 $friendlyName = str_replace( ':', '~', $friendlyName );
 742                 return "$dir/$friendlyName.html";
 743         }
 744
 745         /**
 746          * Get a URL with no fragment or server name.  If this page is generated
 747          * with action=render, $wgServer is prepended.
 748          * @param string $query an optional query string; if not specified,
 749          *      $wgArticlePath will be used.
 750          * @return string the URL
 751          * @access public
 752          */
 753         function getLocalURL( $query = '' ) {
 754                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $wgServer, $action;
 755
 756                 if ( $this->isExternal() ) {
 757                         return $this->getFullURL();
 758                 }
 759
 760                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 761                 if ( $wgMakeDumpLinks ) {
 762                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 763                 } elseif ( $query == '' ) {
 764                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 765                 } else {
 766                         global $wgActionPaths;
 767                         if( !empty( $wgActionPaths ) &&
 768                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 769                                 $action = urldecode( $matches[2] );
 770                                 if( isset( $wgActionPaths[$action] ) ) {
 771                                         $query = $matches[1];
 772                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 773                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 774                                         if( $query != '' ) $url .= '?' . $query;
 775                                         return $url;
 776                                 }
 777                         }
 778                         if ( $query == '-' ) {
 779                                 $query = '';
 780                         }
 781                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 782                 }
 783
 784                 if ($action == 'render')
 785                         return $wgServer . $url;
 786                 else
 787                         return $url;
 788         }
 789
 790         /**
 791          * Get an HTML-escaped version of the URL form, suitable for
 792          * using in a link, without a server name or fragment
 793          * @param string $query an optional query string
 794          * @return string the URL
 795          * @access public
 796          */
 797         function escapeLocalURL( $query = '' ) {
 798                 return htmlspecialchars( $this->getLocalURL( $query ) );
 799         }
 800
 801         /**
 802          * Get an HTML-escaped version of the URL form, suitable for
 803          * using in a link, including the server name and fragment
 804          *
 805          * @return string the URL
 806          * @param string $query an optional query string
 807          * @access public
 808          */
 809         function escapeFullURL( $query = '' ) {
 810                 return htmlspecialchars( $this->getFullURL( $query ) );
 811         }
 812
 813         /**
 814          * Get the URL form for an internal link.
 815          * - Used in various Squid-related code, in case we have a different
 816          * internal hostname for the server from the exposed one.
 817          *
 818          * @param string $query an optional query string
 819          * @return string the URL
 820          * @access public
 821          */
 822         function getInternalURL( $query = '' ) {
 823                 global $wgInternalServer;
 824                 return $wgInternalServer . $this->getLocalURL( $query );
 825         }
 826
 827         /**
 828          * Get the edit URL for this Title
 829          * @return string the URL, or a null string if this is an
 830          *      interwiki link
 831          * @access public
 832          */
 833         function getEditURL() {
 834                 global $wgServer, $wgScript;
 835
 836                 if ( '' != $this->mInterwiki ) { return ''; }
 837                 $s = $this->getLocalURL( 'action=edit' );
 838
 839                 return $s;
 840         }
 841
 842         /**
 843          * Get the HTML-escaped displayable text form.
 844          * Used for the title field in <a> tags.
 845          * @return string the text, including any prefixes
 846          * @access public
 847          */
 848         function getEscapedText() {
 849                 return htmlspecialchars( $this->getPrefixedText() );
 850         }
 851
 852         /**
 853          * Is this Title interwiki?
 854          * @return boolean
 855          * @access public
 856          */
 857         function isExternal() { return ( '' != $this->mInterwiki ); }
 858
 859         /**
 860          * Does the title correspond to a protected article?
 861          * @param string $what the action the page is protected from,
 862          *      by default checks move and edit
 863          * @return boolean
 864          * @access public
 865          */
 866         function isProtected($action = '') {
 867                 if ( -1 == $this->mNamespace ) { return true; }
 868                 if($action == 'edit' || $action == '') {
 869                         $a = $this->getRestrictions("edit");
 870                         if ( in_array( 'sysop', $a ) ) { return true; }
 871                 }
 872                 if($action == 'move' || $action == '') {
 873                         $a = $this->getRestrictions("move");
 874                         if ( in_array( 'sysop', $a ) ) { return true; }
 875                 }
 876                 return false;
 877         }
 878
 879         /**
 880          * Is $wgUser is watching this page?
 881          * @return boolean
 882          * @access public
 883          */
 884         function userIsWatching() {
 885                 global $wgUser;
 886
 887                 if ( is_null( $this->mWatched ) ) {
 888                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 889                                 $this->mWatched = false;
 890                         } else {
 891                                 $this->mWatched = $wgUser->isWatched( $this );
 892                         }
 893                 }
 894                 return $this->mWatched;
 895         }
 896
 897         /**
 898          * Is $wgUser perform $action this page?
 899          * @param string $action action that permission needs to be checked for
 900          * @return boolean
 901          * @access private
 902          */
 903         function userCan($action) {
 904                 $fname = 'Title::userCanEdit';
 905                 wfProfileIn( $fname );
 906
 907                 global $wgUser;
 908                 if( NS_SPECIAL == $this->mNamespace ) {
 909                         wfProfileOut( $fname );
 910                         return false;
 911                 }
 912                 if( NS_MEDIAWIKI == $this->mNamespace &&
 913                     !$wgUser->isAllowed('editinterface') ) {
 914                         wfProfileOut( $fname );
 915                         return false;
 916                 }
 917                 if( $this->mDbkeyform == '_' ) {
 918                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 919                         wfProfileOut( $fname );
 920                         return false;
 921                 }
 922
 923                 # protect global styles and js
 924                 if ( NS_MEDIAWIKI == $this->mNamespace
 925                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 926                      && !$wgUser->isAllowed('editinterface') ) {
 927                         wfProfileOut( $fname );
 928                         return false;
 929                 }
 930
 931                 # protect css/js subpages of user pages
 932                 # XXX: this might be better using restrictions
 933                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 934                 if( NS_USER == $this->mNamespace
 935                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 936                         && !$wgUser->isAllowed('editinterface')
 937                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 938                         wfProfileOut( $fname );
 939                         return false;
 940                 }
 941
 942                 foreach( $this->getRestrictions($action) as $right ) {
 943                         // Backwards compatibility, rewrite sysop -> protect
 944                         if ( $right == 'sysop' ) {
 945                                 $right = 'protect';
 946                         }
 947                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 948                                 wfProfileOut( $fname );
 949                                 return false;
 950                         }
 951                 }
 952
 953                 if( $action == 'move' && !$this->isMovable() ) {
 954                         wfProfileOut( $fname );
 955                         return false;
 956                 }
 957
 958                 wfProfileOut( $fname );
 959                 return true;
 960         }
 961
 962         /**
 963          * Can $wgUser edit this page?
 964          * @return boolean
 965          * @access public
 966          */
 967         function userCanEdit() {
 968                 return $this->userCan('edit');
 969         }
 970
 971         /**
 972          * Can $wgUser move this page?
 973          * @return boolean
 974          * @access public
 975          */
 976         function userCanMove() {
 977                 return $this->userCan('move');
 978         }
 979
 980         /**
 981          * Would anybody with sufficient privileges be able to move this page?
 982          * Some pages just aren't movable.
 983          *
 984          * @return boolean
 985          * @access public
 986          */
 987         function isMovable() {
 988                 return Namespace::isMovable( $this->getNamespace() )
 989                         && $this->getInterwiki() == '';
 990         }
 991
 992         /**
 993          * Can $wgUser read this page?
 994          * @return boolean
 995          * @access public
 996          */
 997         function userCanRead() {
 998                 global $wgUser;
 999
1000                 if( $wgUser->isAllowed('read') ) {
1001                         return true;
1002                 } else {
1003                         global $wgWhitelistRead;
1004
1005                         /** If anon users can create an account,
1006                             they need to reach the login page first! */
1007                         if( $wgUser->isAllowed( 'createaccount' )
1008                             && $this->getNamespace() == NS_SPECIAL
1009                             && $this->getText() == 'Userlogin' ) {
1010                                 return true;
1011                         }
1012
1013                         /** some pages are explicitly allowed */
1014                         $name = $this->getPrefixedText();
1015                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1016                                 return true;
1017                         }
1018
1019                         # Compatibility with old settings
1020                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1021                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1022                                         return true;
1023                                 }
1024                         }
1025                 }
1026                 return false;
1027         }
1028
1029         /**
1030          * Is this a talk page of some sort?
1031          * @return bool
1032          * @access public
1033          */
1034         function isTalkPage() {
1035                 return Namespace::isTalk( $this->getNamespace() );
1036         }
1037
1038         /**
1039          * Is this a .css or .js subpage of a user page?
1040          * @return bool
1041          * @access public
1042          */
1043         function isCssJsSubpage() {
1044                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1045         }
1046         /**
1047          * Is this a .css subpage of a user page?
1048          * @return bool
1049          * @access public
1050          */
1051         function isCssSubpage() {
1052                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1053         }
1054         /**
1055          * Is this a .js subpage of a user page?
1056          * @return bool
1057          * @access public
1058          */
1059         function isJsSubpage() {
1060                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1061         }
1062         /**
1063          * Protect css/js subpages of user pages: can $wgUser edit
1064          * this page?
1065          *
1066          * @return boolean
1067          * @todo XXX: this might be better using restrictions
1068          * @access public
1069          */
1070         function userCanEditCssJsSubpage() {
1071                 global $wgUser;
1072                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1073         }
1074
1075         /**
1076          * Loads a string into mRestrictions array
1077          * @param string $res restrictions in string format
1078          * @access public
1079          */
1080         function loadRestrictions( $res ) {
1081                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1082                         $temp = explode( '=', trim( $restrict ) );
1083                         if(count($temp) == 1) {
1084                                 // old format should be treated as edit/move restriction
1085                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1086                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1087                         } else {
1088                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1089                         }
1090                 }
1091                 $this->mRestrictionsLoaded = true;
1092         }
1093
1094         /**
1095          * Accessor/initialisation for mRestrictions
1096          * @param string $action action that permission needs to be checked for
1097          * @return array the array of groups allowed to edit this article
1098          * @access public
1099          */
1100         function getRestrictions($action) {
1101                 $id = $this->getArticleID();
1102                 if ( 0 == $id ) { return array(); }
1103
1104                 if ( ! $this->mRestrictionsLoaded ) {
1105                         $dbr =& wfGetDB( DB_SLAVE );
1106                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1107                         $this->loadRestrictions( $res );
1108                 }
1109                 if( isset( $this->mRestrictions[$action] ) ) {
1110                         return $this->mRestrictions[$action];
1111                 }
1112                 return array();
1113         }
1114
1115         /**
1116          * Is there a version of this page in the deletion archive?
1117          * @return int the number of archived revisions
1118          * @access public
1119          */
1120         function isDeleted() {
1121                 $fname = 'Title::isDeleted';
1122                 if ( $this->getNamespace() < 0 ) {
1123                         $n = 0;
1124                 } else {
1125                         $dbr =& wfGetDB( DB_SLAVE );
1126                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1127                                 'ar_title' => $this->getDBkey() ), $fname );
1128                 }
1129                 return (int)$n;
1130         }
1131
1132         /**
1133          * Get the article ID for this Title from the link cache,
1134          * adding it if necessary
1135          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1136          *      for update
1137          * @return int the ID
1138          * @access public
1139          */
1140         function getArticleID( $flags = 0 ) {
1141                 global $wgLinkCache;
1142
1143                 if ( $flags & GAID_FOR_UPDATE ) {
1144                         $oldUpdate = $wgLinkCache->forUpdate( true );
1145                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1146                         $wgLinkCache->forUpdate( $oldUpdate );
1147                 } else {
1148                         if ( -1 == $this->mArticleID ) {
1149                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1150                         }
1151                 }
1152                 return $this->mArticleID;
1153         }
1154
1155         function getLatestRevID() {
1156                 if ($this->mLatestID !== false)
1157                         return $this->mLatestID;
1158
1159                 $db =& wfGetDB(DB_SLAVE);
1160                 return $this->mLatestID = $db->selectField( 'revision',
1161                         "max(rev_id)",
1162                         array('rev_page' => $this->getArticleID()),
1163                         'Title::getLatestRevID' );
1164         }
1165
1166         /**
1167          * This clears some fields in this object, and clears any associated
1168          * keys in the "bad links" section of $wgLinkCache.
1169          *
1170          * - This is called from Article::insertNewArticle() to allow
1171          * loading of the new page_id. It's also called from
1172          * Article::doDeleteArticle()
1173          *
1174          * @param int $newid the new Article ID
1175          * @access public
1176          */
1177         function resetArticleID( $newid ) {
1178                 global $wgLinkCache;
1179                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1180
1181                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1182                 else { $this->mArticleID = $newid; }
1183                 $this->mRestrictionsLoaded = false;
1184                 $this->mRestrictions = array();
1185         }
1186
1187         /**
1188          * Updates page_touched for this page; called from LinksUpdate.php
1189          * @return bool true if the update succeded
1190          * @access public
1191          */
1192         function invalidateCache() {
1193                 global $wgUseFileCache;
1194
1195                 if ( wfReadOnly() ) {
1196                         return;
1197                 }
1198
1199                 $now = wfTimestampNow();
1200                 $dbw =& wfGetDB( DB_MASTER );
1201                 $success = $dbw->update( 'page',
1202                         array( /* SET */
1203                                 'page_touched' => $dbw->timestamp()
1204                         ), array( /* WHERE */
1205                                 'page_namespace' => $this->getNamespace() ,
1206                                 'page_title' => $this->getDBkey()
1207                         ), 'Title::invalidateCache'
1208                 );
1209
1210                 if ($wgUseFileCache) {
1211                         $cache = new CacheManager($this);
1212                         @unlink($cache->fileCacheName());
1213                 }
1214
1215                 return $success;
1216         }
1217
1218         /**
1219          * Prefix some arbitrary text with the namespace or interwiki prefix
1220          * of this object
1221          *
1222          * @param string $name the text
1223          * @return string the prefixed text
1224          * @access private
1225          */
1226         /* private */ function prefix( $name ) {
1227                 global $wgContLang;
1228
1229                 $p = '';
1230                 if ( '' != $this->mInterwiki ) {
1231                         $p = $this->mInterwiki . ':';
1232                 }
1233                 if ( 0 != $this->mNamespace ) {
1234                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1235                 }
1236                 return $p . $name;
1237         }
1238
1239         /**
1240          * Secure and split - main initialisation function for this object
1241          *
1242          * Assumes that mDbkeyform has been set, and is urldecoded
1243          * and uses underscores, but not otherwise munged.  This function
1244          * removes illegal characters, splits off the interwiki and
1245          * namespace prefixes, sets the other forms, and canonicalizes
1246          * everything.
1247          * @return bool true on success
1248          * @access private
1249          */
1250         /* private */ function secureAndSplit() {
1251                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1252                 $fname = 'Title::secureAndSplit';
1253                 wfProfileIn( $fname );
1254
1255                 # Initialisation
1256                 static $rxTc = false;
1257                 if( !$rxTc ) {
1258                         # % is needed as well
1259                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1260                 }
1261
1262                 $this->mInterwiki = $this->mFragment = '';
1263                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1264
1265                 # Clean up whitespace
1266                 #
1267                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1268                 $t = trim( $t, '_' );
1269
1270                 if ( '' == $t ) {
1271                         wfProfileOut( $fname );
1272                         return false;
1273                 }
1274
1275                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1276                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1277                         wfProfileOut( $fname );
1278                         return false;
1279                 }
1280
1281                 $this->mDbkeyform = $t;
1282
1283                 # Initial colon indicating main namespace
1284                 if ( ':' == $t{0} ) {
1285                         $r = substr( $t, 1 );
1286                         $this->mNamespace = NS_MAIN;
1287                 } else {
1288                         # Namespace or interwiki prefix
1289                         $firstPass = true;
1290                         do {
1291                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1292                                         $p = $m[1];
1293                                         $lowerNs = strtolower( $p );
1294                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1295                                                 # Canonical namespace
1296                                                 $t = $m[2];
1297                                                 $this->mNamespace = $ns;
1298                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1299                                                 # Ordinary namespace
1300                                                 $t = $m[2];
1301                                                 $this->mNamespace = $ns;
1302                                         } elseif( $this->getInterwikiLink( $p ) ) {
1303                                                 if( !$firstPass ) {
1304                                                         # Can't make a local interwiki link to an interwiki link.
1305                                                         # That's just crazy!
1306                                                         wfProfileOut( $fname );
1307                                                         return false;
1308                                                 }
1309
1310                                                 # Interwiki link
1311                                                 $t = $m[2];
1312                                                 $this->mInterwiki = $p;
1313
1314                                                 # Redundant interwiki prefix to the local wiki
1315                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1316                                                         if( $t == '' ) {
1317                                                                 # Can't have an empty self-link
1318                                                                 wfProfileOut( $fname );
1319                                                                 return false;
1320                                                         }
1321                                                         $this->mInterwiki = '';
1322                                                         $firstPass = false;
1323                                                         # Do another namespace split...
1324                                                         continue;
1325                                                 }
1326                                         }
1327                                         # If there's no recognized interwiki or namespace,
1328                                         # then let the colon expression be part of the title.
1329                                 }
1330                                 break;
1331                         } while( true );
1332                         $r = $t;
1333                 }
1334
1335                 # We already know that some pages won't be in the database!
1336                 #
1337                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1338                         $this->mArticleID = 0;
1339                 }
1340                 $f = strstr( $r, '#' );
1341                 if ( false !== $f ) {
1342                         $this->mFragment = substr( $f, 1 );
1343                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1344                         # remove whitespace again: prevents "Foo_bar_#"
1345                         # becoming "Foo_bar_"
1346                         $r = preg_replace( '/_*$/', '', $r );
1347                 }
1348
1349                 # Reject illegal characters.
1350                 #
1351                 if( preg_match( $rxTc, $r ) ) {
1352                         wfProfileOut( $fname );
1353                         return false;
1354                 }
1355
1356                 /**
1357                  * Pages with "/./" or "/../" appearing in the URLs will
1358                  * often be unreachable due to the way web browsers deal
1359                  * with 'relative' URLs. Forbid them explicitly.
1360                  */
1361                 if ( strpos( $r, '.' ) !== false &&
1362                      ( $r === '.' || $r === '..' ||
1363                        strpos( $r, './' ) === 0  ||
1364                        strpos( $r, '../' ) === 0 ||
1365                        strpos( $r, '/./' ) !== false ||
1366                        strpos( $r, '/../' ) !== false ) )
1367                 {
1368                         wfProfileOut( $fname );
1369                         return false;
1370                 }
1371
1372                 # We shouldn't need to query the DB for the size.
1373                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1374                 if ( strlen( $r ) > 255 ) {
1375                         wfProfileOut( $fname );
1376                         return false;
1377                 }
1378
1379                 /**
1380                  * Normally, all wiki links are forced to have
1381                  * an initial capital letter so [[foo]] and [[Foo]]
1382                  * point to the same place.
1383                  *
1384                  * Don't force it for interwikis, since the other
1385                  * site might be case-sensitive.
1386                  */
1387                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1388                         $t = $wgContLang->ucfirst( $r );
1389                 } else {
1390                         $t = $r;
1391                 }
1392
1393                 /**
1394                  * Can't make a link to a namespace alone...
1395                  * "empty" local links can only be self-links
1396                  * with a fragment identifier.
1397                  */
1398                 if( $t == '' &&
1399                         $this->mInterwiki == '' &&
1400                         $this->mNamespace != NS_MAIN ) {
1401                         wfProfileOut( $fname );
1402                         return false;
1403                 }
1404
1405                 # Fill fields
1406                 $this->mDbkeyform = $t;
1407                 $this->mUrlform = wfUrlencode( $t );
1408
1409                 $this->mTextform = str_replace( '_', ' ', $t );
1410
1411                 wfProfileOut( $fname );
1412                 return true;
1413         }
1414
1415         /**
1416          * Get a Title object associated with the talk page of this article
1417          * @return Title the object for the talk page
1418          * @access public
1419          */
1420         function getTalkPage() {
1421                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1422         }
1423
1424         /**
1425          * Get a title object associated with the subject page of this
1426          * talk page
1427          *
1428          * @return Title the object for the subject page
1429          * @access public
1430          */
1431         function getSubjectPage() {
1432                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1433         }
1434
1435         /**
1436          * Get an array of Title objects linking to this Title
1437          * Also stores the IDs in the link cache.
1438          *
1439          * @param string $options may be FOR UPDATE
1440          * @return array the Title objects linking here
1441          * @access public
1442          */
1443         function getLinksTo( $options = '' ) {
1444                 global $wgLinkCache;
1445                 $id = $this->getArticleID();
1446
1447                 if ( $options ) {
1448                         $db =& wfGetDB( DB_MASTER );
1449                 } else {
1450                         $db =& wfGetDB( DB_SLAVE );
1451                 }
1452
1453                 $res = $db->select( array( 'page', 'pagelinks' ),
1454                         array( 'page_namespace', 'page_title', 'page_id' ),
1455                         array(
1456                                 'pl_from=page_id',
1457                                 'pl_namespace' => $this->getNamespace(),
1458                                 'pl_title'     => $this->getDbKey() ),
1459                         'Title::getLinksTo',
1460                         $options );
1461
1462                 $retVal = array();
1463                 if ( $db->numRows( $res ) ) {
1464                         while ( $row = $db->fetchObject( $res ) ) {
1465                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1466                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1467                                         $retVal[] = $titleObj;
1468                                 }
1469                         }
1470                 }
1471                 $db->freeResult( $res );
1472                 return $retVal;
1473         }
1474
1475         /**
1476          * Get an array of Title objects referring to non-existent articles linked from this page
1477          *
1478          * @param string $options may be FOR UPDATE
1479          * @return array the Title objects
1480          * @access public
1481          */
1482         function getBrokenLinksFrom( $options = '' ) {
1483                 global $wgLinkCache;
1484
1485                 if ( $options ) {
1486                         $db =& wfGetDB( DB_MASTER );
1487                 } else {
1488                         $db =& wfGetDB( DB_SLAVE );
1489                 }
1490
1491                 $res = $db->safeQuery(
1492                           "SELECT pl_namespace, pl_title
1493                              FROM !
1494                         LEFT JOIN !
1495                                ON pl_namespace=page_namespace
1496                               AND pl_title=page_title
1497                             WHERE pl_from=?
1498                               AND page_namespace IS NULL
1499                                   !",
1500                         $db->tableName( 'pagelinks' ),
1501                         $db->tableName( 'page' ),
1502                         $this->getArticleId(),
1503                         $options );
1504
1505                 $retVal = array();
1506                 if ( $db->numRows( $res ) ) {
1507                         while ( $row = $db->fetchObject( $res ) ) {
1508                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1509                         }
1510                 }
1511                 $db->freeResult( $res );
1512                 return $retVal;
1513         }
1514
1515
1516         /**
1517          * Get a list of URLs to purge from the Squid cache when this
1518          * page changes
1519          *
1520          * @return array the URLs
1521          * @access public
1522          */
1523         function getSquidURLs() {
1524                 return array(
1525                         $this->getInternalURL(),
1526                         $this->getInternalURL( 'action=history' )
1527                 );
1528         }
1529
1530         /**
1531          * Move this page without authentication
1532          * @param Title &$nt the new page Title
1533          * @access public
1534          */
1535         function moveNoAuth( &$nt ) {
1536                 return $this->moveTo( $nt, false );
1537         }
1538
1539         /**
1540          * Check whether a given move operation would be valid.
1541          * Returns true if ok, or a message key string for an error message
1542          * if invalid. (Scarrrrry ugly interface this.)
1543          * @param Title &$nt the new title
1544          * @param bool $auth indicates whether $wgUser's permissions
1545          *      should be checked
1546          * @return mixed true on success, message name on failure
1547          * @access public
1548          */
1549         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1550                 global $wgUser;
1551                 if( !$this or !$nt ) {
1552                         return 'badtitletext';
1553                 }
1554                 if( $this->equals( $nt ) ) {
1555                         return 'selfmove';
1556                 }
1557                 if( !$this->isMovable() || !$nt->isMovable() ) {
1558                         return 'immobile_namespace';
1559                 }
1560
1561                 $fname = 'Title::move';
1562                 $oldid = $this->getArticleID();
1563                 $newid = $nt->getArticleID();
1564
1565                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1566                         return 'articleexists';
1567                 }
1568                 if ( ( '' == $this->getDBkey() ) ||
1569                          ( !$oldid ) ||
1570                      ( '' == $nt->getDBkey() ) ) {
1571                         return 'badarticleerror';
1572                 }
1573
1574                 if ( $auth && (
1575                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1576                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1577                         return 'protectedpage';
1578                 }
1579
1580                 # The move is allowed only if (1) the target doesn't exist, or
1581                 # (2) the target is a redirect to the source, and has no history
1582                 # (so we can undo bad moves right after they're done).
1583
1584                 if ( 0 != $newid ) { # Target exists; check for validity
1585                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1586                                 return 'articleexists';
1587                         }
1588                 }
1589                 return true;
1590         }
1591
1592         /**
1593          * Move a title to a new location
1594          * @param Title &$nt the new title
1595          * @param bool $auth indicates whether $wgUser's permissions
1596          *      should be checked
1597          * @return mixed true on success, message name on failure
1598          * @access public
1599          */
1600         function moveTo( &$nt, $auth = true, $reason = '' ) {
1601                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1602                 if( is_string( $err ) ) {
1603                         return $err;
1604                 }
1605
1606                 $pageid = $this->getArticleID();
1607                 if( $nt->exists() ) {
1608                         $this->moveOverExistingRedirect( $nt, $reason );
1609                         $pageCountChange = 0;
1610                 } else { # Target didn't exist, do normal move.
1611                         $this->moveToNewTitle( $nt, $newid, $reason );
1612                         $pageCountChange = 1;
1613                 }
1614                 $redirid = $this->getArticleID();
1615
1616                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1617                 $dbw =& wfGetDB( DB_MASTER );
1618                 $categorylinks = $dbw->tableName( 'categorylinks' );
1619                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1620                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1621                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1622                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1623
1624                 # Update watchlists
1625
1626                 $oldnamespace = $this->getNamespace() & ~1;
1627                 $newnamespace = $nt->getNamespace() & ~1;
1628                 $oldtitle = $this->getDBkey();
1629                 $newtitle = $nt->getDBkey();
1630
1631                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1632                         WatchedItem::duplicateEntries( $this, $nt );
1633                 }
1634
1635                 # Update search engine
1636                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1637                 $u->doUpdate();
1638                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1639                 $u->doUpdate();
1640
1641                 # Update site_stats
1642                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1643                         # Moved out of main namespace
1644                         # not viewed, edited, removing
1645                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1646                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1647                         # Moved into main namespace
1648                         # not viewed, edited, adding
1649                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1650                 } elseif ( $pageCountChange ) {
1651                         # Added redirect
1652                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1653                 } else{
1654                         $u = false;
1655                 }
1656                 if ( $u ) {
1657                         $u->doUpdate();
1658                 }
1659
1660                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1661                 return true;
1662         }
1663
1664         /**
1665          * Move page to a title which is at present a redirect to the
1666          * source page
1667          *
1668          * @param Title &$nt the page to move to, which should currently
1669          *      be a redirect
1670          * @access private
1671          */
1672         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1673                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1674                 $fname = 'Title::moveOverExistingRedirect';
1675                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1676
1677                 if ( $reason ) {
1678                         $comment .= ": $reason";
1679                 }
1680
1681                 $now = wfTimestampNow();
1682                 $rand = wfRandom();
1683                 $newid = $nt->getArticleID();
1684                 $oldid = $this->getArticleID();
1685                 $dbw =& wfGetDB( DB_MASTER );
1686                 $links = $dbw->tableName( 'links' );
1687
1688                 # Delete the old redirect. We don't save it to history since
1689                 # by definition if we've got here it's rather uninteresting.
1690                 # We have to remove it so that the next step doesn't trigger
1691                 # a conflict on the unique namespace+title index...
1692                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1693
1694                 # Save a null revision in the page's history notifying of the move
1695                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1696                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1697                         true );
1698                 $nullRevId = $nullRevision->insertOn( $dbw );
1699
1700                 # Change the name of the target page:
1701                 $dbw->update( 'page',
1702                         /* SET */ array(
1703                                 'page_touched'   => $dbw->timestamp($now),
1704                                 'page_namespace' => $nt->getNamespace(),
1705                                 'page_title'     => $nt->getDBkey(),
1706                                 'page_latest'    => $nullRevId,
1707                         ),
1708                         /* WHERE */ array( 'page_id' => $oldid ),
1709                         $fname
1710                 );
1711                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1712
1713                 # Recreate the redirect, this time in the other direction.
1714                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1715                 $redirectArticle = new Article( $this );
1716                 $newid = $redirectArticle->insertOn( $dbw );
1717                 $redirectRevision = new Revision( array(
1718                         'page'    => $newid,
1719                         'comment' => $comment,
1720                         'text'    => $redirectText ) );
1721                 $revid = $redirectRevision->insertOn( $dbw );
1722                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1723                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1724
1725                 # Log the move
1726                 $log = new LogPage( 'move' );
1727                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1728
1729                 # Now, we record the link from the redirect to the new title.
1730                 # It should have no other outgoing links...
1731                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1732                 $dbw->insert( 'pagelinks',
1733                         array(
1734                                 'pl_from'      => $newid,
1735                                 'pl_namespace' => $nt->getNamespace(),
1736                                 'pl_title'     => $nt->getDbKey() ),
1737                         $fname );
1738
1739                 # Purge squid
1740                 if ( $wgUseSquid ) {
1741                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1742                         $u = new SquidUpdate( $urls );
1743                         $u->doUpdate();
1744                 }
1745         }
1746
1747         /**
1748          * Move page to non-existing title.
1749          * @param Title &$nt the new Title
1750          * @param int &$newid set to be the new article ID
1751          * @access private
1752          */
1753         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1754                 global $wgUser, $wgLinkCache, $wgUseSquid;
1755                 global $wgMwRedir;
1756                 $fname = 'MovePageForm::moveToNewTitle';
1757                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1758                 if ( $reason ) {
1759                         $comment .= ": $reason";
1760                 }
1761
1762                 $newid = $nt->getArticleID();
1763                 $oldid = $this->getArticleID();
1764                 $dbw =& wfGetDB( DB_MASTER );
1765                 $now = $dbw->timestamp();
1766                 wfSeedRandom();
1767                 $rand = wfRandom();
1768
1769                 # Save a null revision in the page's history notifying of the move
1770                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1771                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1772                         true );
1773                 $nullRevId = $nullRevision->insertOn( $dbw );
1774
1775                 # Rename cur entry
1776                 $dbw->update( 'page',
1777                         /* SET */ array(
1778                                 'page_touched'   => $now,
1779                                 'page_namespace' => $nt->getNamespace(),
1780                                 'page_title'     => $nt->getDBkey(),
1781                                 'page_latest'    => $nullRevId,
1782                         ),
1783                         /* WHERE */ array( 'page_id' => $oldid ),
1784                         $fname
1785                 );
1786
1787                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1788
1789                 # Insert redirect
1790                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1791                 $redirectArticle = new Article( $this );
1792                 $newid = $redirectArticle->insertOn( $dbw );
1793                 $redirectRevision = new Revision( array(
1794                         'page'    => $newid,
1795                         'comment' => $comment,
1796                         'text'    => $redirectText ) );
1797                 $revid = $redirectRevision->insertOn( $dbw );
1798                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1799                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1800
1801                 # Log the move
1802                 $log = new LogPage( 'move' );
1803                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1804
1805                 # Purge caches as per article creation
1806                 Article::onArticleCreate( $nt );
1807
1808                 # Record the just-created redirect's linking to the page
1809                 $dbw->insert( 'pagelinks',
1810                         array(
1811                                 'pl_from'      => $newid,
1812                                 'pl_namespace' => $nt->getNamespace(),
1813                                 'pl_title'     => $nt->getDBkey() ),
1814                         $fname );
1815
1816                 # Non-existent target may have had broken links to it; these must
1817                 # now be touched to update link coloring.
1818                 $nt->touchLinks();
1819
1820                 # Purge old title from squid
1821                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1822                 $titles = $nt->getLinksTo();
1823                 if ( $wgUseSquid ) {
1824                         $urls = $this->getSquidURLs();
1825                         foreach ( $titles as $linkTitle ) {
1826                                 $urls[] = $linkTitle->getInternalURL();
1827                         }
1828                         $u = new SquidUpdate( $urls );
1829                         $u->doUpdate();
1830                 }
1831         }
1832
1833         /**
1834          * Checks if $this can be moved to a given Title
1835          * - Selects for update, so don't call it unless you mean business
1836          *
1837          * @param Title &$nt the new title to check
1838          * @access public
1839          */
1840         function isValidMoveTarget( $nt ) {
1841
1842                 $fname = 'Title::isValidMoveTarget';
1843                 $dbw =& wfGetDB( DB_MASTER );
1844
1845                 # Is it a redirect?
1846                 $id  = $nt->getArticleID();
1847                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1848                         array( 'page_is_redirect','old_text' ),
1849                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1850                         $fname, 'FOR UPDATE' );
1851
1852                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1853                         # Not a redirect
1854                         return false;
1855                 }
1856
1857                 # Does the redirect point to the source?
1858                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1859                         $redirTitle = Title::newFromText( $m[1] );
1860                         if( !is_object( $redirTitle ) ||
1861                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1862                                 return false;
1863                         }
1864                 }
1865
1866                 # Does the article have a history?
1867                 $row = $dbw->selectRow( array( 'page', 'revision'),
1868                         array( 'rev_id' ),
1869                         array( 'page_namespace' => $nt->getNamespace(),
1870                                 'page_title' => $nt->getDBkey(),
1871                                 'page_id=rev_page AND page_latest != rev_id'
1872                         ), $fname, 'FOR UPDATE'
1873                 );
1874
1875                 # Return true if there was no history
1876                 return $row === false;
1877         }
1878
1879         /**
1880          * Create a redirect; fails if the title already exists; does
1881          * not notify RC
1882          *
1883          * @param Title $dest the destination of the redirect
1884          * @param string $comment the comment string describing the move
1885          * @return bool true on success
1886          * @access public
1887          */
1888         function createRedirect( $dest, $comment ) {
1889                 global $wgUser;
1890                 if ( $this->getArticleID() ) {
1891                         return false;
1892                 }
1893
1894                 $fname = 'Title::createRedirect';
1895                 $dbw =& wfGetDB( DB_MASTER );
1896
1897                 $article = new Article( $this );
1898                 $newid = $article->insertOn( $dbw );
1899                 $revision = new Revision( array(
1900                         'page'      => $newid,
1901                         'comment'   => $comment,
1902                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1903                         ) );
1904                 $revisionId = $revision->insertOn( $dbw );
1905                 $article->updateRevisionOn( $dbw, $revision, 0 );
1906
1907                 # Link table
1908                 $dbw->insert( 'pagelinks',
1909                         array(
1910                                 'pl_from'      => $newid,
1911                                 'pl_namespace' => $dest->getNamespace(),
1912                                 'pl_title'     => $dest->getDbKey()
1913                         ), $fname
1914                 );
1915
1916                 Article::onArticleCreate( $this );
1917                 return true;
1918         }
1919
1920         /**
1921          * Get categories to which this Title belongs and return an array of
1922          * categories' names.
1923          *
1924          * @return array an array of parents in the form:
1925          *      $parent => $currentarticle
1926          * @access public
1927          */
1928         function getParentCategories() {
1929                 global $wgContLang,$wgUser;
1930
1931                 $titlekey = $this->getArticleId();
1932                 $sk =& $wgUser->getSkin();
1933                 $parents = array();
1934                 $dbr =& wfGetDB( DB_SLAVE );
1935                 $categorylinks = $dbr->tableName( 'categorylinks' );
1936
1937                 # NEW SQL
1938                 $sql = "SELECT * FROM $categorylinks"
1939                      ." WHERE cl_from='$titlekey'"
1940                          ." AND cl_from <> '0'"
1941                          ." ORDER BY cl_sortkey";
1942
1943                 $res = $dbr->query ( $sql ) ;
1944
1945                 if($dbr->numRows($res) > 0) {
1946                         while ( $x = $dbr->fetchObject ( $res ) )
1947                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1948                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1949                         $dbr->freeResult ( $res ) ;
1950                 } else {
1951                         $data = '';
1952                 }
1953                 return $data;
1954         }
1955
1956         /**
1957          * Get a tree of parent categories
1958          * @param array $children an array with the children in the keys, to check for circular refs
1959          * @return array
1960          * @access public
1961          */
1962         function getParentCategoryTree( $children = array() ) {
1963                 $parents = $this->getParentCategories();
1964
1965                 if($parents != '') {
1966                         foreach($parents as $parent => $current)
1967                         {
1968                                 if ( array_key_exists( $parent, $children ) ) {
1969                                         # Circular reference
1970                                         $stack[$parent] = array();
1971                                 } else {
1972                                         $nt = Title::newFromText($parent);
1973                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1974                                 }
1975                         }
1976                         return $stack;
1977                 } else {
1978                         return array();
1979                 }
1980         }
1981
1982
1983         /**
1984          * Get an associative array for selecting this title from
1985          * the "cur" table
1986          *
1987          * @return array
1988          * @access public
1989          */
1990         function curCond() {
1991                 wfDebugDieBacktrace( 'curCond called' );
1992                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1993         }
1994
1995         /**
1996          * Get an associative array for selecting this title from the
1997          * "old" table
1998          *
1999          * @return array
2000          * @access public
2001          */
2002         function oldCond() {
2003                 wfDebugDieBacktrace( 'oldCond called' );
2004                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
2005         }
2006
2007         /**
2008          * Get the revision ID of the previous revision
2009          *
2010          * @param integer $revision  Revision ID. Get the revision that was before this one.
2011          * @return interger $oldrevision|false
2012          */
2013         function getPreviousRevisionID( $revision ) {
2014                 $dbr =& wfGetDB( DB_SLAVE );
2015                 return $dbr->selectField( 'revision', 'rev_id',
2016                         'rev_page=' . IntVal( $this->getArticleId() ) .
2017                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
2018         }
2019
2020         /**
2021          * Get the revision ID of the next revision
2022          *
2023          * @param integer $revision  Revision ID. Get the revision that was after this one.
2024          * @return interger $oldrevision|false
2025          */
2026         function getNextRevisionID( $revision ) {
2027                 $dbr =& wfGetDB( DB_SLAVE );
2028                 return $dbr->selectField( 'revision', 'rev_id',
2029                         'rev_page=' . IntVal( $this->getArticleId() ) .
2030                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
2031         }
2032
2033         /**
2034          * Compare with another title.
2035          *
2036          * @param Title $title
2037          * @return bool
2038          */
2039         function equals( &$title ) {
2040                 return $this->getInterwiki() == $title->getInterwiki()
2041                         && $this->getNamespace() == $title->getNamespace()
2042                         && $this->getDbkey() == $title->getDbkey();
2043         }
2044
2045         /**
2046          * Check if page exists
2047          * @return bool
2048          */
2049         function exists() {
2050                 return $this->getArticleId() != 0;
2051         }
2052
2053         /**
2054          * Should a link should be displayed as a known link, just based on its title?
2055          *
2056          * Currently, a self-link with a fragment, special pages and image pages are in
2057          * this category. Special pages never exist in the database. Some images do not
2058          * have description pages in the database, but the description page contains
2059          * useful history information that the user may want to link to.
2060          */
2061         function isAlwaysKnown() {
2062                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2063                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2064         }
2065
2066         /**
2067          * Update page_touched timestamps on pages linking to this title.
2068          * In principal, this could be backgrounded and could also do squid
2069          * purging.
2070          */
2071         function touchLinks() {
2072                 $fname = 'Title::touchLinks';
2073
2074                 $dbw =& wfGetDB( DB_MASTER );
2075
2076                 $res = $dbw->select( 'pagelinks',
2077                         array( 'pl_from' ),
2078                         array(
2079                                 'pl_namespace' => $this->getNamespace(),
2080                                 'pl_title'     => $this->getDbKey() ),
2081                         $fname );
2082                 if ( 0 == $dbw->numRows( $res ) ) {
2083                         return;
2084                 }
2085
2086                 $arr = array();
2087                 $toucharr = array();
2088                 while( $row = $dbw->fetchObject( $res ) ) {
2089                         $toucharr[] = $row->pl_from;
2090                 }
2091
2092                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2093                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2094         }
2095
2096         function trackbackURL() {
2097                 global $wgTitle, $wgScriptPath, $wgServer;
2098
2099                 return "$wgServer$wgScriptPath/trackback.php?article="
2100                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2101         }
2102
2103         function trackbackRDF() {
2104                 $url = htmlspecialchars($this->getFullURL());
2105                 $title = htmlspecialchars($this->getText());
2106                 $tburl = $this->trackbackURL();
2107
2108                 return "
2109 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2110          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2111          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2112 <rdf:Description
2113    rdf:about=\"$url\"
2114    dc:identifier=\"$url\"
2115    dc:title=\"$title\"
2116    trackback:ping=\"$tburl\" />
2117 </rdf:RDF>";
2118         }
2119 }
2120 ?>