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                         $ret = NULL;
 149                         return $ret;
 150                 }
 151         }
 152
 153         /**
 154          * Create a new Title from URL-encoded text. Ensures that
 155          * the given title's length does not exceed the maximum.
 156          * @param string $url the title, as might be taken from a URL
 157          * @return Title the new object, or NULL on an error
 158          * @static
 159          * @access public
 160          */
 161         function newFromURL( $url ) {
 162                 global $wgLang, $wgServer;
 163                 $t = new Title();
 164
 165                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 166                 # but some URLs used it as a space replacement and they still come
 167                 # from some external search tools.
 168                 $s = str_replace( '+', ' ', $url );
 169
 170                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 171                 if( $t->secureAndSplit() ) {
 172                         return $t;
 173                 } else {
 174                         return NULL;
 175                 }
 176         }
 177
 178         /**
 179          * Create a new Title from an article ID
 180          *
 181          * @todo This is inefficiently implemented, the page row is requested
 182          *       but not used for anything else
 183          *
 184          * @param int $id the page_id corresponding to the Title to create
 185          * @return Title the new object, or NULL on an error
 186          * @access public
 187          * @static
 188          */
 189         function newFromID( $id ) {
 190                 $fname = 'Title::newFromID';
 191                 $dbr =& wfGetDB( DB_SLAVE );
 192                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 193                         array( 'page_id' => $id ), $fname );
 194                 if ( $row !== false ) {
 195                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 196                 } else {
 197                         $title = NULL;
 198                 }
 199                 return $title;
 200         }
 201
 202         /**
 203          * Create a new Title from a namespace index and a DB key.
 204          * It's assumed that $ns and $title are *valid*, for instance when
 205          * they came directly from the database or a special page name.
 206          * For convenience, spaces are converted to underscores so that
 207          * eg user_text fields can be used directly.
 208          *
 209          * @param int $ns the namespace of the article
 210          * @param string $title the unprefixed database key form
 211          * @return Title the new object
 212          * @static
 213          * @access public
 214          */
 215         function &makeTitle( $ns, $title ) {
 216                 $t =& new Title();
 217                 $t->mInterwiki = '';
 218                 $t->mFragment = '';
 219                 $t->mNamespace = intval( $ns );
 220                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 221                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 222                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 223                 $t->mTextform = str_replace( '_', ' ', $title );
 224                 return $t;
 225         }
 226
 227         /**
 228          * Create a new Title frrom a namespace index and a DB key.
 229          * The parameters will be checked for validity, which is a bit slower
 230          * than makeTitle() but safer for user-provided data.
 231          *
 232          * @param int $ns the namespace of the article
 233          * @param string $title the database key form
 234          * @return Title the new object, or NULL on an error
 235          * @static
 236          * @access public
 237          */
 238         function makeTitleSafe( $ns, $title ) {
 239                 $t = new Title();
 240                 $t->mDbkeyform = Title::makeName( $ns, $title );
 241                 if( $t->secureAndSplit() ) {
 242                         return $t;
 243                 } else {
 244                         return NULL;
 245                 }
 246         }
 247
 248         /**
 249          * Create a new Title for the Main Page
 250          *
 251          * @static
 252          * @return Title the new object
 253          * @access public
 254          */
 255         function newMainPage() {
 256                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 257         }
 258
 259         /**
 260          * Create a new Title for a redirect
 261          * @param string $text the redirect title text
 262          * @return Title the new object, or NULL if the text is not a
 263          *      valid redirect
 264          * @static
 265          * @access public
 266          */
 267         function newFromRedirect( $text ) {
 268                 global $wgMwRedir;
 269                 $rt = NULL;
 270                 if ( $wgMwRedir->matchStart( $text ) ) {
 271                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 272                                 # categories are escaped using : for example one can enter:
 273                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 274                                 if ( substr($m[1],0,1) == ':') {
 275                                         # We don't want to keep the ':'
 276                                         $m[1] = substr( $m[1], 1 );
 277                                 }
 278
 279                                 $rt = Title::newFromText( $m[1] );
 280                                 # Disallow redirects to Special:Userlogout
 281                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 282                                         $rt = NULL;
 283                                 }
 284                         }
 285                 }
 286                 return $rt;
 287         }
 288
 289 #----------------------------------------------------------------------------
 290 #       Static functions
 291 #----------------------------------------------------------------------------
 292
 293         /**
 294          * Get the prefixed DB key associated with an ID
 295          * @param int $id the page_id of the article
 296          * @return Title an object representing the article, or NULL
 297          *      if no such article was found
 298          * @static
 299          * @access public
 300          */
 301         function nameOf( $id ) {
 302                 $fname = 'Title::nameOf';
 303                 $dbr =& wfGetDB( DB_SLAVE );
 304
 305                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 306                 if ( $s === false ) { return NULL; }
 307
 308                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 309                 return $n;
 310         }
 311
 312         /**
 313          * Get a regex character class describing the legal characters in a link
 314          * @return string the list of characters, not delimited
 315          * @static
 316          * @access public
 317          */
 318         function legalChars() {
 319                 global $wgLegalTitleChars;
 320                 return $wgLegalTitleChars;
 321         }
 322
 323         /**
 324          * Get a string representation of a title suitable for
 325          * including in a search index
 326          *
 327          * @param int $ns a namespace index
 328          * @param string $title text-form main part
 329          * @return string a stripped-down title string ready for the
 330          *      search index
 331          */
 332         /* static */ function indexTitle( $ns, $title ) {
 333                 global $wgDBminWordLen, $wgContLang;
 334                 require_once( 'SearchEngine.php' );
 335
 336                 $lc = SearchEngine::legalSearchChars() . '&#;';
 337                 $t = $wgContLang->stripForSearch( $title );
 338                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 339                 $t = strtolower( $t );
 340
 341                 # Handle 's, s'
 342                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 343                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 344
 345                 $t = preg_replace( "/\\s+/", ' ', $t );
 346
 347                 if ( $ns == NS_IMAGE ) {
 348                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 349                 }
 350                 return trim( $t );
 351         }
 352
 353         /*
 354          * Make a prefixed DB key from a DB key and a namespace index
 355          * @param int $ns numerical representation of the namespace
 356          * @param string $title the DB key form the title
 357          * @return string the prefixed form of the title
 358          */
 359         /* static */ function makeName( $ns, $title ) {
 360                 global $wgContLang;
 361
 362                 $n = $wgContLang->getNsText( $ns );
 363                 return $n == '' ? $title : "$n:$title";
 364         }
 365
 366         /**
 367          * Returns the URL associated with an interwiki prefix
 368          * @param string $key the interwiki prefix (e.g. "MeatBall")
 369          * @return the associated URL, containing "$1", which should be
 370          *      replaced by an article title
 371          * @static (arguably)
 372          * @access public
 373          */
 374         function getInterwikiLink( $key, $transludeonly = false ) {
 375                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 376                 $fname = 'Title::getInterwikiLink';
 377
 378                 wfProfileIn( $fname );
 379
 380                 $key = strtolower( $key );
 381
 382                 $k = $wgDBname.':interwiki:'.$key;
 383                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 384                         wfProfileOut( $fname );
 385                         return $wgTitleInterwikiCache[$k]->iw_url;
 386                 }
 387
 388                 $s = $wgMemc->get( $k );
 389                 # Ignore old keys with no iw_local
 390                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 391                         $wgTitleInterwikiCache[$k] = $s;
 392                         wfProfileOut( $fname );
 393                         return $s->iw_url;
 394                 }
 395
 396                 $dbr =& wfGetDB( DB_SLAVE );
 397                 $res = $dbr->select( 'interwiki',
 398                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 399                         array( 'iw_prefix' => $key ), $fname );
 400                 if( !$res ) {
 401                         wfProfileOut( $fname );
 402                         return '';
 403                 }
 404
 405                 $s = $dbr->fetchObject( $res );
 406                 if( !$s ) {
 407                         # Cache non-existence: create a blank object and save it to memcached
 408                         $s = (object)false;
 409                         $s->iw_url = '';
 410                         $s->iw_local = 0;
 411                         $s->iw_trans = 0;
 412                 }
 413                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 414                 $wgTitleInterwikiCache[$k] = $s;
 415
 416                 wfProfileOut( $fname );
 417                 return $s->iw_url;
 418         }
 419
 420         /**
 421          * Determine whether the object refers to a page within
 422          * this project.
 423          *
 424          * @return bool TRUE if this is an in-project interwiki link
 425          *      or a wikilink, FALSE otherwise
 426          * @access public
 427          */
 428         function isLocal() {
 429                 global $wgTitleInterwikiCache, $wgDBname;
 430
 431                 if ( $this->mInterwiki != '' ) {
 432                         # Make sure key is loaded into cache
 433                         $this->getInterwikiLink( $this->mInterwiki );
 434                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 435                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 436                 } else {
 437                         return true;
 438                 }
 439         }
 440
 441         /**
 442          * Determine whether the object refers to a page within
 443          * this project and is transcludable.
 444          *
 445          * @return bool TRUE if this is transcludable
 446          * @access public
 447          */
 448         function isTrans() {
 449                 global $wgTitleInterwikiCache, $wgDBname;
 450
 451                 if ($this->mInterwiki == '' || !$this->isLocal())
 452                         return false;
 453                 # Make sure key is loaded into cache
 454                 $this->getInterwikiLink( $this->mInterwiki );
 455                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 456                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 457         }
 458
 459         /**
 460          * Update the page_touched field for an array of title objects
 461          * @todo Inefficient unless the IDs are already loaded into the
 462          *      link cache
 463          * @param array $titles an array of Title objects to be touched
 464          * @param string $timestamp the timestamp to use instead of the
 465          *      default current time
 466          * @static
 467          * @access public
 468          */
 469         function touchArray( $titles, $timestamp = '' ) {
 470                 global $wgUseFileCache;
 471
 472                 if ( count( $titles ) == 0 ) {
 473                         return;
 474                 }
 475                 $dbw =& wfGetDB( DB_MASTER );
 476                 if ( $timestamp == '' ) {
 477                         $timestamp = $dbw->timestamp();
 478                 }
 479                 $page = $dbw->tableName( 'page' );
 480                 /*
 481                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 482                 $first = true;
 483
 484                 foreach ( $titles as $title ) {
 485                         if ( $wgUseFileCache ) {
 486                                 $cm = new CacheManager($title);
 487                                 @unlink($cm->fileCacheName());
 488                         }
 489
 490                         if ( ! $first ) {
 491                                 $sql .= ',';
 492                         }
 493                         $first = false;
 494                         $sql .= $title->getArticleID();
 495                 }
 496                 $sql .= ')';
 497                 if ( ! $first ) {
 498                         $dbw->query( $sql, 'Title::touchArray' );
 499                 }
 500                 */
 501                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 502                 // do them in small chunks:
 503                 $fname = 'Title::touchArray';
 504                 foreach( $titles as $title ) {
 505                         $dbw->update( 'page',
 506                                 array( 'page_touched' => $timestamp ),
 507                                 array(
 508                                         'page_namespace' => $title->getNamespace(),
 509                                         'page_title'     => $title->getDBkey() ),
 510                                 $fname );
 511                 }
 512         }
 513
 514 #----------------------------------------------------------------------------
 515 #       Other stuff
 516 #----------------------------------------------------------------------------
 517
 518         /** Simple accessors */
 519         /**
 520          * Get the text form (spaces not underscores) of the main part
 521          * @return string
 522          * @access public
 523          */
 524         function getText() { return $this->mTextform; }
 525         /**
 526          * Get the URL-encoded form of the main part
 527          * @return string
 528          * @access public
 529          */
 530         function getPartialURL() { return $this->mUrlform; }
 531         /**
 532          * Get the main part with underscores
 533          * @return string
 534          * @access public
 535          */
 536         function getDBkey() { return $this->mDbkeyform; }
 537         /**
 538          * Get the namespace index, i.e. one of the NS_xxxx constants
 539          * @return int
 540          * @access public
 541          */
 542         function getNamespace() { return $this->mNamespace; }
 543         /**
 544          * Get the namespace text
 545          * @return string
 546          * @access public
 547          */
 548         function getNsText() {
 549                 global $wgContLang;
 550                 return $wgContLang->getNsText( $this->mNamespace );
 551         }
 552         /**
 553          * Get the namespace text of the subject (rather than talk) page
 554          * @return string
 555          * @access public
 556          */
 557         function getSubjectNsText() {
 558                 global $wgContLang;
 559                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 560         }
 561
 562         /**
 563          * Get the interwiki prefix (or null string)
 564          * @return string
 565          * @access public
 566          */
 567         function getInterwiki() { return $this->mInterwiki; }
 568         /**
 569          * Get the Title fragment (i.e. the bit after the #)
 570          * @return string
 571          * @access public
 572          */
 573         function getFragment() { return $this->mFragment; }
 574         /**
 575          * Get the default namespace index, for when there is no namespace
 576          * @return int
 577          * @access public
 578          */
 579         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 580
 581         /**
 582          * Get title for search index
 583          * @return string a stripped-down title string ready for the
 584          *      search index
 585          */
 586         function getIndexTitle() {
 587                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 588         }
 589
 590         /**
 591          * Get the prefixed database key form
 592          * @return string the prefixed title, with underscores and
 593          *      any interwiki and namespace prefixes
 594          * @access public
 595          */
 596         function getPrefixedDBkey() {
 597                 $s = $this->prefix( $this->mDbkeyform );
 598                 $s = str_replace( ' ', '_', $s );
 599                 return $s;
 600         }
 601
 602         /**
 603          * Get the prefixed title with spaces.
 604          * This is the form usually used for display
 605          * @return string the prefixed title, with spaces
 606          * @access public
 607          */
 608         function getPrefixedText() {
 609                 global $wgContLang;
 610                 if ( empty( $this->mPrefixedText ) ) {
 611                         $s = $this->prefix( $this->mTextform );
 612                         $s = str_replace( '_', ' ', $s );
 613                         $this->mPrefixedText = $s;
 614                 }
 615                 return $this->mPrefixedText;
 616         }
 617
 618         /**
 619          * Get the prefixed title with spaces, plus any fragment
 620          * (part beginning with '#')
 621          * @return string the prefixed title, with spaces and
 622          *      the fragment, including '#'
 623          * @access public
 624          */
 625         function getFullText() {
 626                 global $wgContLang;
 627                 $text = $this->getPrefixedText();
 628                 if( '' != $this->mFragment ) {
 629                         $text .= '#' . $this->mFragment;
 630                 }
 631                 return $text;
 632         }
 633
 634         /**
 635          * Get a URL-encoded title (not an actual URL) including interwiki
 636          * @return string the URL-encoded form
 637          * @access public
 638          */
 639         function getPrefixedURL() {
 640                 $s = $this->prefix( $this->mDbkeyform );
 641                 $s = str_replace( ' ', '_', $s );
 642
 643                 $s = wfUrlencode ( $s ) ;
 644
 645                 # Cleaning up URL to make it look nice -- is this safe?
 646                 $s = str_replace( '%28', '(', $s );
 647                 $s = str_replace( '%29', ')', $s );
 648
 649                 return $s;
 650         }
 651
 652         /**
 653          * Get a real URL referring to this title, with interwiki link and
 654          * fragment
 655          *
 656          * @param string $query an optional query string, not used
 657          *      for interwiki links
 658          * @return string the URL
 659          * @access public
 660          */
 661         function getFullURL( $query = '' ) {
 662                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 663
 664                 if ( '' == $this->mInterwiki ) {
 665                         return $wgServer . $this->getLocalUrl( $query );
 666                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 667                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 668                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 669                 } else {
 670                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 671                 }
 672
 673                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 674                 if ( '' != $namespace ) {
 675                         # Can this actually happen? Interwikis shouldn't be parsed.
 676                         $namespace .= ':';
 677                 }
 678                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 679                 if( $query != '' ) {
 680                         if( false === strpos( $url, '?' ) ) {
 681                                 $url .= '?';
 682                         } else {
 683                                 $url .= '&';
 684                         }
 685                         $url .= $query;
 686                 }
 687                 if ( '' != $this->mFragment ) {
 688                         $url .= '#' . $this->mFragment;
 689                 }
 690                 return $url;
 691         }
 692
 693         /**
 694          * Get a relative directory for putting an HTML version of this article into
 695          */
 696         function getHashedDirectory() {
 697                 global $wgMakeDumpLinks, $wgInputEncoding;
 698                 $dbkey = $this->getDBkey();
 699
 700                 # Split into characters
 701                 if ( $wgInputEncoding == 'UTF-8' ) {
 702                         preg_match_all( '/./us', $dbkey, $m );
 703                 } else {
 704                         preg_match_all( '/./s', $dbkey, $m );
 705                 }
 706                 $chars = $m[0];
 707                 $length = count( $chars );
 708                 $dir = '';
 709
 710                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 711                         if ( $i ) {
 712                                 $dir .= '/';
 713                         }
 714                         if ( $i >= $length ) {
 715                                 $dir .= '_';
 716                         } elseif ( ord( $chars[$i] ) > 32 ) {
 717                                 $dir .= strtolower( $chars[$i] );
 718                         } else {
 719                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 720                         }
 721                 }
 722                 return $dir;
 723         }
 724
 725         function getHashedFilename() {
 726                 $dbkey = $this->getPrefixedDBkey();
 727                 $mainPage = Title::newMainPage();
 728                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 729                         return 'index.html';
 730                 }
 731
 732                 $dir = $this->getHashedDirectory();
 733
 734                 # Replace illegal charcters for Windows paths with underscores
 735                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 736
 737                 # Work out lower case form. We assume we're on a system with case-insensitive
 738                 # filenames, so unless the case is of a special form, we have to disambiguate
 739                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 740
 741                 # Make it mostly unique
 742                 if ( $lowerCase != $friendlyName  ) {
 743                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 744                 }
 745                 # Handle colon specially by replacing it with tilde
 746                 # Thus we reduce the number of paths with hashes appended
 747                 $friendlyName = str_replace( ':', '~', $friendlyName );
 748                 return "$dir/$friendlyName.html";
 749         }
 750
 751         /**
 752          * Get a URL with no fragment or server name.  If this page is generated
 753          * with action=render, $wgServer is prepended.
 754          * @param string $query an optional query string; if not specified,
 755          *      $wgArticlePath will be used.
 756          * @return string the URL
 757          * @access public
 758          */
 759         function getLocalURL( $query = '' ) {
 760                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $wgServer, $action;
 761
 762                 if ( $this->isExternal() ) {
 763                         return $this->getFullURL();
 764                 }
 765
 766                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 767                 if ( $wgMakeDumpLinks ) {
 768                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 769                 } elseif ( $query == '' ) {
 770                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 771                 } else {
 772                         global $wgActionPaths;
 773                         if( !empty( $wgActionPaths ) &&
 774                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 775                                 $action = urldecode( $matches[2] );
 776                                 if( isset( $wgActionPaths[$action] ) ) {
 777                                         $query = $matches[1];
 778                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 779                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 780                                         if( $query != '' ) $url .= '?' . $query;
 781                                         return $url;
 782                                 }
 783                         }
 784                         if ( $query == '-' ) {
 785                                 $query = '';
 786                         }
 787                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 788                 }
 789
 790                 if ($action == 'render')
 791                         return $wgServer . $url;
 792                 else
 793                         return $url;
 794         }
 795
 796         /**
 797          * Get an HTML-escaped version of the URL form, suitable for
 798          * using in a link, without a server name or fragment
 799          * @param string $query an optional query string
 800          * @return string the URL
 801          * @access public
 802          */
 803         function escapeLocalURL( $query = '' ) {
 804                 return htmlspecialchars( $this->getLocalURL( $query ) );
 805         }
 806
 807         /**
 808          * Get an HTML-escaped version of the URL form, suitable for
 809          * using in a link, including the server name and fragment
 810          *
 811          * @return string the URL
 812          * @param string $query an optional query string
 813          * @access public
 814          */
 815         function escapeFullURL( $query = '' ) {
 816                 return htmlspecialchars( $this->getFullURL( $query ) );
 817         }
 818
 819         /**
 820          * Get the URL form for an internal link.
 821          * - Used in various Squid-related code, in case we have a different
 822          * internal hostname for the server from the exposed one.
 823          *
 824          * @param string $query an optional query string
 825          * @return string the URL
 826          * @access public
 827          */
 828         function getInternalURL( $query = '' ) {
 829                 global $wgInternalServer;
 830                 return $wgInternalServer . $this->getLocalURL( $query );
 831         }
 832
 833         /**
 834          * Get the edit URL for this Title
 835          * @return string the URL, or a null string if this is an
 836          *      interwiki link
 837          * @access public
 838          */
 839         function getEditURL() {
 840                 global $wgServer, $wgScript;
 841
 842                 if ( '' != $this->mInterwiki ) { return ''; }
 843                 $s = $this->getLocalURL( 'action=edit' );
 844
 845                 return $s;
 846         }
 847
 848         /**
 849          * Get the HTML-escaped displayable text form.
 850          * Used for the title field in <a> tags.
 851          * @return string the text, including any prefixes
 852          * @access public
 853          */
 854         function getEscapedText() {
 855                 return htmlspecialchars( $this->getPrefixedText() );
 856         }
 857
 858         /**
 859          * Is this Title interwiki?
 860          * @return boolean
 861          * @access public
 862          */
 863         function isExternal() { return ( '' != $this->mInterwiki ); }
 864
 865         /**
 866          * Does the title correspond to a protected article?
 867          * @param string $what the action the page is protected from,
 868          *      by default checks move and edit
 869          * @return boolean
 870          * @access public
 871          */
 872         function isProtected($action = '') {
 873                 if ( -1 == $this->mNamespace ) { return true; }
 874                 if($action == 'edit' || $action == '') {
 875                         $a = $this->getRestrictions("edit");
 876                         if ( in_array( 'sysop', $a ) ) { return true; }
 877                 }
 878                 if($action == 'move' || $action == '') {
 879                         $a = $this->getRestrictions("move");
 880                         if ( in_array( 'sysop', $a ) ) { return true; }
 881                 }
 882                 return false;
 883         }
 884
 885         /**
 886          * Is $wgUser is watching this page?
 887          * @return boolean
 888          * @access public
 889          */
 890         function userIsWatching() {
 891                 global $wgUser;
 892
 893                 if ( is_null( $this->mWatched ) ) {
 894                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 895                                 $this->mWatched = false;
 896                         } else {
 897                                 $this->mWatched = $wgUser->isWatched( $this );
 898                         }
 899                 }
 900                 return $this->mWatched;
 901         }
 902
 903         /**
 904          * Is $wgUser perform $action this page?
 905          * @param string $action action that permission needs to be checked for
 906          * @return boolean
 907          * @access private
 908          */
 909         function userCan($action) {
 910                 $fname = 'Title::userCanEdit';
 911                 wfProfileIn( $fname );
 912
 913                 global $wgUser;
 914                 if( NS_SPECIAL == $this->mNamespace ) {
 915                         wfProfileOut( $fname );
 916                         return false;
 917                 }
 918                 if( NS_MEDIAWIKI == $this->mNamespace &&
 919                     !$wgUser->isAllowed('editinterface') ) {
 920                         wfProfileOut( $fname );
 921                         return false;
 922                 }
 923                 if( $this->mDbkeyform == '_' ) {
 924                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 925                         wfProfileOut( $fname );
 926                         return false;
 927                 }
 928
 929                 # protect global styles and js
 930                 if ( NS_MEDIAWIKI == $this->mNamespace
 931                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 932                      && !$wgUser->isAllowed('editinterface') ) {
 933                         wfProfileOut( $fname );
 934                         return false;
 935                 }
 936
 937                 # protect css/js subpages of user pages
 938                 # XXX: this might be better using restrictions
 939                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 940                 if( NS_USER == $this->mNamespace
 941                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 942                         && !$wgUser->isAllowed('editinterface')
 943                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 944                         wfProfileOut( $fname );
 945                         return false;
 946                 }
 947
 948                 foreach( $this->getRestrictions($action) as $right ) {
 949                         // Backwards compatibility, rewrite sysop -> protect
 950                         if ( $right == 'sysop' ) {
 951                                 $right = 'protect';
 952                         }
 953                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 954                                 wfProfileOut( $fname );
 955                                 return false;
 956                         }
 957                 }
 958
 959                 if( $action == 'move' &&
 960                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 961                         wfProfileOut( $fname );
 962                         return false;
 963                 }
 964
 965                 wfProfileOut( $fname );
 966                 return true;
 967         }
 968
 969         /**
 970          * Can $wgUser edit this page?
 971          * @return boolean
 972          * @access public
 973          */
 974         function userCanEdit() {
 975                 return $this->userCan('edit');
 976         }
 977
 978         /**
 979          * Can $wgUser move this page?
 980          * @return boolean
 981          * @access public
 982          */
 983         function userCanMove() {
 984                 return $this->userCan('move');
 985         }
 986
 987         /**
 988          * Would anybody with sufficient privileges be able to move this page?
 989          * Some pages just aren't movable.
 990          *
 991          * @return boolean
 992          * @access public
 993          */
 994         function isMovable() {
 995                 return Namespace::isMovable( $this->getNamespace() )
 996                         && $this->getInterwiki() == '';
 997         }
 998
 999         /**
1000          * Can $wgUser read this page?
1001          * @return boolean
1002          * @access public
1003          */
1004         function userCanRead() {
1005                 global $wgUser;
1006
1007                 if( $wgUser->isAllowed('read') ) {
1008                         return true;
1009                 } else {
1010                         global $wgWhitelistRead;
1011
1012                         /** If anon users can create an account,
1013                             they need to reach the login page first! */
1014                         if( $wgUser->isAllowed( 'createaccount' )
1015                             && $this->getNamespace() == NS_SPECIAL
1016                             && $this->getText() == 'Userlogin' ) {
1017                                 return true;
1018                         }
1019
1020                         /** some pages are explicitly allowed */
1021                         $name = $this->getPrefixedText();
1022                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1023                                 return true;
1024                         }
1025
1026                         # Compatibility with old settings
1027                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1028                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1029                                         return true;
1030                                 }
1031                         }
1032                 }
1033                 return false;
1034         }
1035
1036         /**
1037          * Is this a talk page of some sort?
1038          * @return bool
1039          * @access public
1040          */
1041         function isTalkPage() {
1042                 return Namespace::isTalk( $this->getNamespace() );
1043         }
1044
1045         /**
1046          * Is this a .css or .js subpage of a user page?
1047          * @return bool
1048          * @access public
1049          */
1050         function isCssJsSubpage() {
1051                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1052         }
1053         /**
1054          * Is this a .css subpage of a user page?
1055          * @return bool
1056          * @access public
1057          */
1058         function isCssSubpage() {
1059                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1060         }
1061         /**
1062          * Is this a .js subpage of a user page?
1063          * @return bool
1064          * @access public
1065          */
1066         function isJsSubpage() {
1067                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1068         }
1069         /**
1070          * Protect css/js subpages of user pages: can $wgUser edit
1071          * this page?
1072          *
1073          * @return boolean
1074          * @todo XXX: this might be better using restrictions
1075          * @access public
1076          */
1077         function userCanEditCssJsSubpage() {
1078                 global $wgUser;
1079                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1080         }
1081
1082         /**
1083          * Loads a string into mRestrictions array
1084          * @param string $res restrictions in string format
1085          * @access public
1086          */
1087         function loadRestrictions( $res ) {
1088                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1089                         $temp = explode( '=', trim( $restrict ) );
1090                         if(count($temp) == 1) {
1091                                 // old format should be treated as edit/move restriction
1092                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1093                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1094                         } else {
1095                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1096                         }
1097                 }
1098                 $this->mRestrictionsLoaded = true;
1099         }
1100
1101         /**
1102          * Accessor/initialisation for mRestrictions
1103          * @param string $action action that permission needs to be checked for
1104          * @return array the array of groups allowed to edit this article
1105          * @access public
1106          */
1107         function getRestrictions($action) {
1108                 $id = $this->getArticleID();
1109                 if ( 0 == $id ) { return array(); }
1110
1111                 if ( ! $this->mRestrictionsLoaded ) {
1112                         $dbr =& wfGetDB( DB_SLAVE );
1113                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1114                         $this->loadRestrictions( $res );
1115                 }
1116                 if( isset( $this->mRestrictions[$action] ) ) {
1117                         return $this->mRestrictions[$action];
1118                 }
1119                 return array();
1120         }
1121
1122         /**
1123          * Is there a version of this page in the deletion archive?
1124          * @return int the number of archived revisions
1125          * @access public
1126          */
1127         function isDeleted() {
1128                 $fname = 'Title::isDeleted';
1129                 if ( $this->getNamespace() < 0 ) {
1130                         $n = 0;
1131                 } else {
1132                         $dbr =& wfGetDB( DB_SLAVE );
1133                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1134                                 'ar_title' => $this->getDBkey() ), $fname );
1135                 }
1136                 return (int)$n;
1137         }
1138
1139         /**
1140          * Get the article ID for this Title from the link cache,
1141          * adding it if necessary
1142          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1143          *      for update
1144          * @return int the ID
1145          * @access public
1146          */
1147         function getArticleID( $flags = 0 ) {
1148                 global $wgLinkCache;
1149                 if ( $flags & GAID_FOR_UPDATE ) {
1150                         $oldUpdate = $wgLinkCache->forUpdate( true );
1151                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1152                         $wgLinkCache->forUpdate( $oldUpdate );
1153                 } else {
1154                         if ( -1 == $this->mArticleID ) {
1155                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1156                         }
1157                 }
1158                 return $this->mArticleID;
1159         }
1160
1161         function getLatestRevID() {
1162                 if ($this->mLatestID !== false)
1163                         return $this->mLatestID;
1164
1165                 $db =& wfGetDB(DB_SLAVE);
1166                 return $this->mLatestID = $db->selectField( 'revision',
1167                         "max(rev_id)",
1168                         array('rev_page' => $this->getArticleID()),
1169                         'Title::getLatestRevID' );
1170         }
1171
1172         /**
1173          * This clears some fields in this object, and clears any associated
1174          * keys in the "bad links" section of $wgLinkCache.
1175          *
1176          * - This is called from Article::insertNewArticle() to allow
1177          * loading of the new page_id. It's also called from
1178          * Article::doDeleteArticle()
1179          *
1180          * @param int $newid the new Article ID
1181          * @access public
1182          */
1183         function resetArticleID( $newid ) {
1184                 global $wgLinkCache;
1185                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1186
1187                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1188                 else { $this->mArticleID = $newid; }
1189                 $this->mRestrictionsLoaded = false;
1190                 $this->mRestrictions = array();
1191         }
1192
1193         /**
1194          * Updates page_touched for this page; called from LinksUpdate.php
1195          * @return bool true if the update succeded
1196          * @access public
1197          */
1198         function invalidateCache() {
1199                 global $wgUseFileCache;
1200
1201                 if ( wfReadOnly() ) {
1202                         return;
1203                 }
1204
1205                 $now = wfTimestampNow();
1206                 $dbw =& wfGetDB( DB_MASTER );
1207                 $success = $dbw->update( 'page',
1208                         array( /* SET */
1209                                 'page_touched' => $dbw->timestamp()
1210                         ), array( /* WHERE */
1211                                 'page_namespace' => $this->getNamespace() ,
1212                                 'page_title' => $this->getDBkey()
1213                         ), 'Title::invalidateCache'
1214                 );
1215
1216                 if ($wgUseFileCache) {
1217                         $cache = new CacheManager($this);
1218                         @unlink($cache->fileCacheName());
1219                 }
1220
1221                 return $success;
1222         }
1223
1224         /**
1225          * Prefix some arbitrary text with the namespace or interwiki prefix
1226          * of this object
1227          *
1228          * @param string $name the text
1229          * @return string the prefixed text
1230          * @access private
1231          */
1232         /* private */ function prefix( $name ) {
1233                 global $wgContLang;
1234
1235                 $p = '';
1236                 if ( '' != $this->mInterwiki ) {
1237                         $p = $this->mInterwiki . ':';
1238                 }
1239                 if ( 0 != $this->mNamespace ) {
1240                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1241                 }
1242                 return $p . $name;
1243         }
1244
1245         /**
1246          * Secure and split - main initialisation function for this object
1247          *
1248          * Assumes that mDbkeyform has been set, and is urldecoded
1249          * and uses underscores, but not otherwise munged.  This function
1250          * removes illegal characters, splits off the interwiki and
1251          * namespace prefixes, sets the other forms, and canonicalizes
1252          * everything.
1253          * @return bool true on success
1254          * @access private
1255          */
1256         /* private */ function secureAndSplit() {
1257                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1258                 $fname = 'Title::secureAndSplit';
1259                 wfProfileIn( $fname );
1260
1261                 # Initialisation
1262                 static $rxTc = false;
1263                 if( !$rxTc ) {
1264                         # % is needed as well
1265                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1266                 }
1267
1268                 $this->mInterwiki = $this->mFragment = '';
1269                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1270
1271                 # Clean up whitespace
1272                 #
1273                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1274                 $t = trim( $t, '_' );
1275
1276                 if ( '' == $t ) {
1277                         wfProfileOut( $fname );
1278                         return false;
1279                 }
1280
1281                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1282                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1283                         wfProfileOut( $fname );
1284                         return false;
1285                 }
1286
1287                 $this->mDbkeyform = $t;
1288
1289                 # Initial colon indicates main namespace rather than specified default
1290                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1291                 if ( ':' == $t{0} ) {
1292                         $this->mNamespace = NS_MAIN;
1293                         $t = substr( $t, 1 ); # remove the colon but continue processing
1294                 }
1295
1296                 # Namespace or interwiki prefix
1297                 $firstPass = true;
1298                 do {
1299                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1300                                 $p = $m[1];
1301                                 $lowerNs = strtolower( $p );
1302                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1303                                         # Canonical namespace
1304                                         $t = $m[2];
1305                                         $this->mNamespace = $ns;
1306                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1307                                         # Ordinary namespace
1308                                         $t = $m[2];
1309                                         $this->mNamespace = $ns;
1310                                 } elseif( $this->getInterwikiLink( $p ) ) {
1311                                         if( !$firstPass ) {
1312                                                 # Can't make a local interwiki link to an interwiki link.
1313                                                 # That's just crazy!
1314                                                 wfProfileOut( $fname );
1315                                                 return false;
1316                                         }
1317
1318                                         # Interwiki link
1319                                         $t = $m[2];
1320                                         $this->mInterwiki = strtolower( $p );
1321
1322                                         # Redundant interwiki prefix to the local wiki
1323                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1324                                                 if( $t == '' ) {
1325                                                         # Can't have an empty self-link
1326                                                         wfProfileOut( $fname );
1327                                                         return false;
1328                                                 }
1329                                                 $this->mInterwiki = '';
1330                                                 $firstPass = false;
1331                                                 # Do another namespace split...
1332                                                 continue;
1333                                         }
1334                                 }
1335                                 # If there's no recognized interwiki or namespace,
1336                                 # then let the colon expression be part of the title.
1337                         }
1338                         break;
1339                 } while( true );
1340                 $r = $t;
1341
1342                 # We already know that some pages won't be in the database!
1343                 #
1344                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1345                         $this->mArticleID = 0;
1346                 }
1347                 $f = strstr( $r, '#' );
1348                 if ( false !== $f ) {
1349                         $this->mFragment = substr( $f, 1 );
1350                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1351                         # remove whitespace again: prevents "Foo_bar_#"
1352                         # becoming "Foo_bar_"
1353                         $r = preg_replace( '/_*$/', '', $r );
1354                 }
1355
1356                 # Reject illegal characters.
1357                 #
1358                 if( preg_match( $rxTc, $r ) ) {
1359                         wfProfileOut( $fname );
1360                         return false;
1361                 }
1362
1363                 /**
1364                  * Pages with "/./" or "/../" appearing in the URLs will
1365                  * often be unreachable due to the way web browsers deal
1366                  * with 'relative' URLs. Forbid them explicitly.
1367                  */
1368                 if ( strpos( $r, '.' ) !== false &&
1369                      ( $r === '.' || $r === '..' ||
1370                        strpos( $r, './' ) === 0  ||
1371                        strpos( $r, '../' ) === 0 ||
1372                        strpos( $r, '/./' ) !== false ||
1373                        strpos( $r, '/../' ) !== false ) )
1374                 {
1375                         wfProfileOut( $fname );
1376                         return false;
1377                 }
1378
1379                 # We shouldn't need to query the DB for the size.
1380                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1381                 if ( strlen( $r ) > 255 ) {
1382                         wfProfileOut( $fname );
1383                         return false;
1384                 }
1385
1386                 /**
1387                  * Normally, all wiki links are forced to have
1388                  * an initial capital letter so [[foo]] and [[Foo]]
1389                  * point to the same place.
1390                  *
1391                  * Don't force it for interwikis, since the other
1392                  * site might be case-sensitive.
1393                  */
1394                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1395                         $t = $wgContLang->ucfirst( $r );
1396                 } else {
1397                         $t = $r;
1398                 }
1399
1400                 /**
1401                  * Can't make a link to a namespace alone...
1402                  * "empty" local links can only be self-links
1403                  * with a fragment identifier.
1404                  */
1405                 if( $t == '' &&
1406                         $this->mInterwiki == '' &&
1407                         $this->mNamespace != NS_MAIN ) {
1408                         wfProfileOut( $fname );
1409                         return false;
1410                 }
1411
1412                 # Fill fields
1413                 $this->mDbkeyform = $t;
1414                 $this->mUrlform = wfUrlencode( $t );
1415
1416                 $this->mTextform = str_replace( '_', ' ', $t );
1417
1418                 wfProfileOut( $fname );
1419                 return true;
1420         }
1421
1422         /**
1423          * Get a Title object associated with the talk page of this article
1424          * @return Title the object for the talk page
1425          * @access public
1426          */
1427         function getTalkPage() {
1428                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1429         }
1430
1431         /**
1432          * Get a title object associated with the subject page of this
1433          * talk page
1434          *
1435          * @return Title the object for the subject page
1436          * @access public
1437          */
1438         function getSubjectPage() {
1439                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1440         }
1441
1442         /**
1443          * Get an array of Title objects linking to this Title
1444          * Also stores the IDs in the link cache.
1445          *
1446          * @param string $options may be FOR UPDATE
1447          * @return array the Title objects linking here
1448          * @access public
1449          */
1450         function getLinksTo( $options = '' ) {
1451                 global $wgLinkCache;
1452                 $id = $this->getArticleID();
1453
1454                 if ( $options ) {
1455                         $db =& wfGetDB( DB_MASTER );
1456                 } else {
1457                         $db =& wfGetDB( DB_SLAVE );
1458                 }
1459
1460                 $res = $db->select( array( 'page', 'pagelinks' ),
1461                         array( 'page_namespace', 'page_title', 'page_id' ),
1462                         array(
1463                                 'pl_from=page_id',
1464                                 'pl_namespace' => $this->getNamespace(),
1465                                 'pl_title'     => $this->getDbKey() ),
1466                         'Title::getLinksTo',
1467                         $options );
1468
1469                 $retVal = array();
1470                 if ( $db->numRows( $res ) ) {
1471                         while ( $row = $db->fetchObject( $res ) ) {
1472                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1473                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1474                                         $retVal[] = $titleObj;
1475                                 }
1476                         }
1477                 }
1478                 $db->freeResult( $res );
1479                 return $retVal;
1480         }
1481
1482         /**
1483          * Get an array of Title objects referring to non-existent articles linked from this page
1484          *
1485          * @param string $options may be FOR UPDATE
1486          * @return array the Title objects
1487          * @access public
1488          */
1489         function getBrokenLinksFrom( $options = '' ) {
1490                 global $wgLinkCache;
1491
1492                 if ( $options ) {
1493                         $db =& wfGetDB( DB_MASTER );
1494                 } else {
1495                         $db =& wfGetDB( DB_SLAVE );
1496                 }
1497
1498                 $res = $db->safeQuery(
1499                           "SELECT pl_namespace, pl_title
1500                              FROM !
1501                         LEFT JOIN !
1502                                ON pl_namespace=page_namespace
1503                               AND pl_title=page_title
1504                             WHERE pl_from=?
1505                               AND page_namespace IS NULL
1506                                   !",
1507                         $db->tableName( 'pagelinks' ),
1508                         $db->tableName( 'page' ),
1509                         $this->getArticleId(),
1510                         $options );
1511
1512                 $retVal = array();
1513                 if ( $db->numRows( $res ) ) {
1514                         while ( $row = $db->fetchObject( $res ) ) {
1515                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1516                         }
1517                 }
1518                 $db->freeResult( $res );
1519                 return $retVal;
1520         }
1521
1522
1523         /**
1524          * Get a list of URLs to purge from the Squid cache when this
1525          * page changes
1526          *
1527          * @return array the URLs
1528          * @access public
1529          */
1530         function getSquidURLs() {
1531                 return array(
1532                         $this->getInternalURL(),
1533                         $this->getInternalURL( 'action=history' )
1534                 );
1535         }
1536
1537         /**
1538          * Move this page without authentication
1539          * @param Title &$nt the new page Title
1540          * @access public
1541          */
1542         function moveNoAuth( &$nt ) {
1543                 return $this->moveTo( $nt, false );
1544         }
1545
1546         /**
1547          * Check whether a given move operation would be valid.
1548          * Returns true if ok, or a message key string for an error message
1549          * if invalid. (Scarrrrry ugly interface this.)
1550          * @param Title &$nt the new title
1551          * @param bool $auth indicates whether $wgUser's permissions
1552          *      should be checked
1553          * @return mixed true on success, message name on failure
1554          * @access public
1555          */
1556         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1557                 global $wgUser;
1558                 if( !$this or !$nt ) {
1559                         return 'badtitletext';
1560                 }
1561                 if( $this->equals( $nt ) ) {
1562                         return 'selfmove';
1563                 }
1564                 if( !$this->isMovable() || !$nt->isMovable() ) {
1565                         return 'immobile_namespace';
1566                 }
1567
1568                 $fname = 'Title::move';
1569                 $oldid = $this->getArticleID();
1570                 $newid = $nt->getArticleID();
1571
1572                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1573                         return 'articleexists';
1574                 }
1575                 if ( ( '' == $this->getDBkey() ) ||
1576                          ( !$oldid ) ||
1577                      ( '' == $nt->getDBkey() ) ) {
1578                         return 'badarticleerror';
1579                 }
1580
1581                 if ( $auth && (
1582                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1583                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1584                         return 'protectedpage';
1585                 }
1586
1587                 # The move is allowed only if (1) the target doesn't exist, or
1588                 # (2) the target is a redirect to the source, and has no history
1589                 # (so we can undo bad moves right after they're done).
1590
1591                 if ( 0 != $newid ) { # Target exists; check for validity
1592                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1593                                 return 'articleexists';
1594                         }
1595                 }
1596                 return true;
1597         }
1598
1599         /**
1600          * Move a title to a new location
1601          * @param Title &$nt the new title
1602          * @param bool $auth indicates whether $wgUser's permissions
1603          *      should be checked
1604          * @return mixed true on success, message name on failure
1605          * @access public
1606          */
1607         function moveTo( &$nt, $auth = true, $reason = '' ) {
1608                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1609                 if( is_string( $err ) ) {
1610                         return $err;
1611                 }
1612
1613                 $pageid = $this->getArticleID();
1614                 if( $nt->exists() ) {
1615                         $this->moveOverExistingRedirect( $nt, $reason );
1616                         $pageCountChange = 0;
1617                 } else { # Target didn't exist, do normal move.
1618                         $this->moveToNewTitle( $nt, $newid, $reason );
1619                         $pageCountChange = 1;
1620                 }
1621                 $redirid = $this->getArticleID();
1622
1623                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1624                 $dbw =& wfGetDB( DB_MASTER );
1625                 $categorylinks = $dbw->tableName( 'categorylinks' );
1626                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1627                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1628                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1629                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1630
1631                 # Update watchlists
1632
1633                 $oldnamespace = $this->getNamespace() & ~1;
1634                 $newnamespace = $nt->getNamespace() & ~1;
1635                 $oldtitle = $this->getDBkey();
1636                 $newtitle = $nt->getDBkey();
1637
1638                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1639                         WatchedItem::duplicateEntries( $this, $nt );
1640                 }
1641
1642                 # Update search engine
1643                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1644                 $u->doUpdate();
1645                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1646                 $u->doUpdate();
1647
1648                 # Update site_stats
1649                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1650                         # Moved out of main namespace
1651                         # not viewed, edited, removing
1652                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1653                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1654                         # Moved into main namespace
1655                         # not viewed, edited, adding
1656                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1657                 } elseif ( $pageCountChange ) {
1658                         # Added redirect
1659                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1660                 } else{
1661                         $u = false;
1662                 }
1663                 if ( $u ) {
1664                         $u->doUpdate();
1665                 }
1666
1667                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1668                 return true;
1669         }
1670
1671         /**
1672          * Move page to a title which is at present a redirect to the
1673          * source page
1674          *
1675          * @param Title &$nt the page to move to, which should currently
1676          *      be a redirect
1677          * @access private
1678          */
1679         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1680                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1681                 $fname = 'Title::moveOverExistingRedirect';
1682                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1683
1684                 if ( $reason ) {
1685                         $comment .= ": $reason";
1686                 }
1687
1688                 $now = wfTimestampNow();
1689                 $rand = wfRandom();
1690                 $newid = $nt->getArticleID();
1691                 $oldid = $this->getArticleID();
1692                 $dbw =& wfGetDB( DB_MASTER );
1693                 $links = $dbw->tableName( 'links' );
1694
1695                 # Delete the old redirect. We don't save it to history since
1696                 # by definition if we've got here it's rather uninteresting.
1697                 # We have to remove it so that the next step doesn't trigger
1698                 # a conflict on the unique namespace+title index...
1699                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1700
1701                 # Save a null revision in the page's history notifying of the move
1702                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1703                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1704                         true );
1705                 $nullRevId = $nullRevision->insertOn( $dbw );
1706
1707                 # Change the name of the target page:
1708                 $dbw->update( 'page',
1709                         /* SET */ array(
1710                                 'page_touched'   => $dbw->timestamp($now),
1711                                 'page_namespace' => $nt->getNamespace(),
1712                                 'page_title'     => $nt->getDBkey(),
1713                                 'page_latest'    => $nullRevId,
1714                         ),
1715                         /* WHERE */ array( 'page_id' => $oldid ),
1716                         $fname
1717                 );
1718                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1719
1720                 # Recreate the redirect, this time in the other direction.
1721                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1722                 $redirectArticle = new Article( $this );
1723                 $newid = $redirectArticle->insertOn( $dbw );
1724                 $redirectRevision = new Revision( array(
1725                         'page'    => $newid,
1726                         'comment' => $comment,
1727                         'text'    => $redirectText ) );
1728                 $revid = $redirectRevision->insertOn( $dbw );
1729                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1730                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1731
1732                 # Log the move
1733                 $log = new LogPage( 'move' );
1734                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1735
1736                 # Now, we record the link from the redirect to the new title.
1737                 # It should have no other outgoing links...
1738                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1739                 $dbw->insert( 'pagelinks',
1740                         array(
1741                                 'pl_from'      => $newid,
1742                                 'pl_namespace' => $nt->getNamespace(),
1743                                 'pl_title'     => $nt->getDbKey() ),
1744                         $fname );
1745
1746                 # Purge squid
1747                 if ( $wgUseSquid ) {
1748                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1749                         $u = new SquidUpdate( $urls );
1750                         $u->doUpdate();
1751                 }
1752         }
1753
1754         /**
1755          * Move page to non-existing title.
1756          * @param Title &$nt the new Title
1757          * @param int &$newid set to be the new article ID
1758          * @access private
1759          */
1760         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1761                 global $wgUser, $wgLinkCache, $wgUseSquid;
1762                 global $wgMwRedir;
1763                 $fname = 'MovePageForm::moveToNewTitle';
1764                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1765                 if ( $reason ) {
1766                         $comment .= ": $reason";
1767                 }
1768
1769                 $newid = $nt->getArticleID();
1770                 $oldid = $this->getArticleID();
1771                 $dbw =& wfGetDB( DB_MASTER );
1772                 $now = $dbw->timestamp();
1773                 wfSeedRandom();
1774                 $rand = wfRandom();
1775
1776                 # Save a null revision in the page's history notifying of the move
1777                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1778                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1779                         true );
1780                 $nullRevId = $nullRevision->insertOn( $dbw );
1781
1782                 # Rename cur entry
1783                 $dbw->update( 'page',
1784                         /* SET */ array(
1785                                 'page_touched'   => $now,
1786                                 'page_namespace' => $nt->getNamespace(),
1787                                 'page_title'     => $nt->getDBkey(),
1788                                 'page_latest'    => $nullRevId,
1789                         ),
1790                         /* WHERE */ array( 'page_id' => $oldid ),
1791                         $fname
1792                 );
1793
1794                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1795
1796                 # Insert redirect
1797                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1798                 $redirectArticle = new Article( $this );
1799                 $newid = $redirectArticle->insertOn( $dbw );
1800                 $redirectRevision = new Revision( array(
1801                         'page'    => $newid,
1802                         'comment' => $comment,
1803                         'text'    => $redirectText ) );
1804                 $revid = $redirectRevision->insertOn( $dbw );
1805                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1806                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1807
1808                 # Log the move
1809                 $log = new LogPage( 'move' );
1810                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1811
1812                 # Purge caches as per article creation
1813                 Article::onArticleCreate( $nt );
1814
1815                 # Record the just-created redirect's linking to the page
1816                 $dbw->insert( 'pagelinks',
1817                         array(
1818                                 'pl_from'      => $newid,
1819                                 'pl_namespace' => $nt->getNamespace(),
1820                                 'pl_title'     => $nt->getDBkey() ),
1821                         $fname );
1822
1823                 # Non-existent target may have had broken links to it; these must
1824                 # now be touched to update link coloring.
1825                 $nt->touchLinks();
1826
1827                 # Purge old title from squid
1828                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1829                 $titles = $nt->getLinksTo();
1830                 if ( $wgUseSquid ) {
1831                         $urls = $this->getSquidURLs();
1832                         foreach ( $titles as $linkTitle ) {
1833                                 $urls[] = $linkTitle->getInternalURL();
1834                         }
1835                         $u = new SquidUpdate( $urls );
1836                         $u->doUpdate();
1837                 }
1838         }
1839
1840         /**
1841          * Checks if $this can be moved to a given Title
1842          * - Selects for update, so don't call it unless you mean business
1843          *
1844          * @param Title &$nt the new title to check
1845          * @access public
1846          */
1847         function isValidMoveTarget( $nt ) {
1848
1849                 $fname = 'Title::isValidMoveTarget';
1850                 $dbw =& wfGetDB( DB_MASTER );
1851
1852                 # Is it a redirect?
1853                 $id  = $nt->getArticleID();
1854                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1855                         array( 'page_is_redirect','old_text','old_flags' ),
1856                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1857                         $fname, 'FOR UPDATE' );
1858
1859                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1860                         # Not a redirect
1861                         return false;
1862                 }
1863                 $text = Revision::getRevisionText( $obj );
1864
1865                 # Does the redirect point to the source?
1866                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1867                         $redirTitle = Title::newFromText( $m[1] );
1868                         if( !is_object( $redirTitle ) ||
1869                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1870                                 return false;
1871                         }
1872                 } else {
1873                         # Fail safe
1874                         return false;
1875                 }
1876
1877                 # Does the article have a history?
1878                 $row = $dbw->selectRow( array( 'page', 'revision'),
1879                         array( 'rev_id' ),
1880                         array( 'page_namespace' => $nt->getNamespace(),
1881                                 'page_title' => $nt->getDBkey(),
1882                                 'page_id=rev_page AND page_latest != rev_id'
1883                         ), $fname, 'FOR UPDATE'
1884                 );
1885
1886                 # Return true if there was no history
1887                 return $row === false;
1888         }
1889
1890         /**
1891          * Create a redirect; fails if the title already exists; does
1892          * not notify RC
1893          *
1894          * @param Title $dest the destination of the redirect
1895          * @param string $comment the comment string describing the move
1896          * @return bool true on success
1897          * @access public
1898          */
1899         function createRedirect( $dest, $comment ) {
1900                 global $wgUser;
1901                 if ( $this->getArticleID() ) {
1902                         return false;
1903                 }
1904
1905                 $fname = 'Title::createRedirect';
1906                 $dbw =& wfGetDB( DB_MASTER );
1907
1908                 $article = new Article( $this );
1909                 $newid = $article->insertOn( $dbw );
1910                 $revision = new Revision( array(
1911                         'page'      => $newid,
1912                         'comment'   => $comment,
1913                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1914                         ) );
1915                 $revisionId = $revision->insertOn( $dbw );
1916                 $article->updateRevisionOn( $dbw, $revision, 0 );
1917
1918                 # Link table
1919                 $dbw->insert( 'pagelinks',
1920                         array(
1921                                 'pl_from'      => $newid,
1922                                 'pl_namespace' => $dest->getNamespace(),
1923                                 'pl_title'     => $dest->getDbKey()
1924                         ), $fname
1925                 );
1926
1927                 Article::onArticleCreate( $this );
1928                 return true;
1929         }
1930
1931         /**
1932          * Get categories to which this Title belongs and return an array of
1933          * categories' names.
1934          *
1935          * @return array an array of parents in the form:
1936          *      $parent => $currentarticle
1937          * @access public
1938          */
1939         function getParentCategories() {
1940                 global $wgContLang,$wgUser;
1941
1942                 $titlekey = $this->getArticleId();
1943                 $sk =& $wgUser->getSkin();
1944                 $parents = array();
1945                 $dbr =& wfGetDB( DB_SLAVE );
1946                 $categorylinks = $dbr->tableName( 'categorylinks' );
1947
1948                 # NEW SQL
1949                 $sql = "SELECT * FROM $categorylinks"
1950                      ." WHERE cl_from='$titlekey'"
1951                          ." AND cl_from <> '0'"
1952                          ." ORDER BY cl_sortkey";
1953
1954                 $res = $dbr->query ( $sql ) ;
1955
1956                 if($dbr->numRows($res) > 0) {
1957                         while ( $x = $dbr->fetchObject ( $res ) )
1958                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1959                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1960                         $dbr->freeResult ( $res ) ;
1961                 } else {
1962                         $data = '';
1963                 }
1964                 return $data;
1965         }
1966
1967         /**
1968          * Get a tree of parent categories
1969          * @param array $children an array with the children in the keys, to check for circular refs
1970          * @return array
1971          * @access public
1972          */
1973         function getParentCategoryTree( $children = array() ) {
1974                 $parents = $this->getParentCategories();
1975
1976                 if($parents != '') {
1977                         foreach($parents as $parent => $current)
1978                         {
1979                                 if ( array_key_exists( $parent, $children ) ) {
1980                                         # Circular reference
1981                                         $stack[$parent] = array();
1982                                 } else {
1983                                         $nt = Title::newFromText($parent);
1984                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1985                                 }
1986                         }
1987                         return $stack;
1988                 } else {
1989                         return array();
1990                 }
1991         }
1992
1993
1994         /**
1995          * Get an associative array for selecting this title from
1996          * the "cur" table
1997          *
1998          * @return array
1999          * @access public
2000          */
2001         function curCond() {
2002                 wfDebugDieBacktrace( 'curCond called' );
2003                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
2004         }
2005
2006         /**
2007          * Get an associative array for selecting this title from the
2008          * "old" table
2009          *
2010          * @return array
2011          * @access public
2012          */
2013         function oldCond() {
2014                 wfDebugDieBacktrace( 'oldCond called' );
2015                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
2016         }
2017
2018         /**
2019          * Get the revision ID of the previous revision
2020          *
2021          * @param integer $revision  Revision ID. Get the revision that was before this one.
2022          * @return interger $oldrevision|false
2023          */
2024         function getPreviousRevisionID( $revision ) {
2025                 $dbr =& wfGetDB( DB_SLAVE );
2026                 return $dbr->selectField( 'revision', 'rev_id',
2027                         'rev_page=' . intval( $this->getArticleId() ) .
2028                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2029         }
2030
2031         /**
2032          * Get the revision ID of the next revision
2033          *
2034          * @param integer $revision  Revision ID. Get the revision that was after this one.
2035          * @return interger $oldrevision|false
2036          */
2037         function getNextRevisionID( $revision ) {
2038                 $dbr =& wfGetDB( DB_SLAVE );
2039                 return $dbr->selectField( 'revision', 'rev_id',
2040                         'rev_page=' . intval( $this->getArticleId() ) .
2041                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2042         }
2043
2044         /**
2045          * Compare with another title.
2046          *
2047          * @param Title $title
2048          * @return bool
2049          */
2050         function equals( &$title ) {
2051                 return $this->getInterwiki() == $title->getInterwiki()
2052                         && $this->getNamespace() == $title->getNamespace()
2053                         && $this->getDbkey() == $title->getDbkey();
2054         }
2055
2056         /**
2057          * Check if page exists
2058          * @return bool
2059          */
2060         function exists() {
2061                 return $this->getArticleId() != 0;
2062         }
2063
2064         /**
2065          * Should a link should be displayed as a known link, just based on its title?
2066          *
2067          * Currently, a self-link with a fragment, special pages and image pages are in
2068          * this category. Special pages never exist in the database. Some images do not
2069          * have description pages in the database, but the description page contains
2070          * useful history information that the user may want to link to.
2071          */
2072         function isAlwaysKnown() {
2073                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2074                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2075         }
2076
2077         /**
2078          * Update page_touched timestamps on pages linking to this title.
2079          * In principal, this could be backgrounded and could also do squid
2080          * purging.
2081          */
2082         function touchLinks() {
2083                 $fname = 'Title::touchLinks';
2084
2085                 $dbw =& wfGetDB( DB_MASTER );
2086
2087                 $res = $dbw->select( 'pagelinks',
2088                         array( 'pl_from' ),
2089                         array(
2090                                 'pl_namespace' => $this->getNamespace(),
2091                                 'pl_title'     => $this->getDbKey() ),
2092                         $fname );
2093                 if ( 0 == $dbw->numRows( $res ) ) {
2094                         return;
2095                 }
2096
2097                 $arr = array();
2098                 $toucharr = array();
2099                 while( $row = $dbw->fetchObject( $res ) ) {
2100                         $toucharr[] = $row->pl_from;
2101                 }
2102                 if (!count($toucharr))
2103                         return;
2104                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2105                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2106         }
2107
2108         function trackbackURL() {
2109                 global $wgTitle, $wgScriptPath, $wgServer;
2110
2111                 return "$wgServer$wgScriptPath/trackback.php?article="
2112                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2113         }
2114
2115         function trackbackRDF() {
2116                 $url = htmlspecialchars($this->getFullURL());
2117                 $title = htmlspecialchars($this->getText());
2118                 $tburl = $this->trackbackURL();
2119
2120                 return "
2121 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2122          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2123          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2124 <rdf:Description
2125    rdf:about=\"$url\"
2126    dc:identifier=\"$url\"
2127    dc:title=\"$title\"
2128    trackback:ping=\"$tburl\" />
2129 </rdf:RDF>";
2130         }
2131 }
2132 ?>