includes/Title.php

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