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 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13 # Title::newFromTitle maintains a cache to avoid
  14 # expensive re-normalization of commonly used titles.
  15 # On a batch operation this can become a memory leak
  16 # if not bounded. After hitting this many titles,
  17 # reset the cache.
  18 define( 'MW_TITLECACHE_MAX', 1000 );
  19
  20 /**
  21  * Title class
  22  * - Represents a title, which may contain an interwiki designation or namespace
  23  * - Can fetch various kinds of data from the database, albeit inefficiently.
  24  *
  25  * @package MediaWiki
  26  */
  27 class Title {
  28         /**
  29          * Static cache variables
  30          */
  31         static private $titleCache=array();
  32         static private $interwikiCache=array();
  33
  34
  35         /**
  36          * All member variables should be considered private
  37          * Please use the accessor functions
  38          */
  39
  40          /**#@+
  41          * @private
  42          */
  43
  44         var $mTextform;           # Text form (spaces not underscores) of the main part
  45         var $mUrlform;            # URL-encoded form of the main part
  46         var $mDbkeyform;          # Main part with underscores
  47         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  48         var $mInterwiki;          # Interwiki prefix (or null string)
  49         var $mFragment;           # Title fragment (i.e. the bit after the #)
  50         var $mArticleID;          # Article ID, fetched from the link cache on demand
  51         var $mLatestID;         # ID of most recent revision
  52         var $mRestrictions;       # Array of groups allowed to edit this article
  53                                 # Only null or "sysop" are supported
  54         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  55         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  56         var $mDefaultNamespace;   # Namespace index when there is no namespace
  57                             # Zero except in {{transclusion}} tags
  58         var $mWatched;      # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  59         /**#@-*/
  60
  61
  62         /**
  63          * Constructor
  64          * @private
  65          */
  66         /* private */ function Title() {
  67                 $this->mInterwiki = $this->mUrlform =
  68                 $this->mTextform = $this->mDbkeyform = '';
  69                 $this->mArticleID = -1;
  70                 $this->mNamespace = NS_MAIN;
  71                 $this->mRestrictionsLoaded = false;
  72                 $this->mRestrictions = array();
  73                 # Dont change the following, NS_MAIN is hardcoded in several place
  74                 # See bug #696
  75                 $this->mDefaultNamespace = NS_MAIN;
  76                 $this->mWatched = NULL;
  77                 $this->mLatestID = false;
  78         }
  79
  80         /**
  81          * Create a new Title from a prefixed DB key
  82          * @param string $key The database key, which has underscores
  83          *      instead of spaces, possibly including namespace and
  84          *      interwiki prefixes
  85          * @return Title the new object, or NULL on an error
  86          * @static
  87          * @access public
  88          */
  89         /* static */ function newFromDBkey( $key ) {
  90                 $t = new Title();
  91                 $t->mDbkeyform = $key;
  92                 if( $t->secureAndSplit() )
  93                         return $t;
  94                 else
  95                         return NULL;
  96         }
  97
  98         /**
  99          * Create a new Title from text, such as what one would
 100          * find in a link. Decodes any HTML entities in the text.
 101          *
 102          * @param string $text the link text; spaces, prefixes,
 103          *      and an initial ':' indicating the main namespace
 104          *      are accepted
 105          * @param int $defaultNamespace the namespace to use if
 106          *      none is specified by a prefix
 107          * @return Title the new object, or NULL on an error
 108          * @static
 109          * @access public
 110          */
 111         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 112                 if( is_object( $text ) ) {
 113                         throw new MWException( '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( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 125                         return Title::$titleCache[$text];
 126                 }
 127
 128                 /**
 129                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 130                  */
 131                 $filteredText = Sanitizer::decodeCharReferences( $text );
 132
 133                 $t = new Title();
 134                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 135                 $t->mDefaultNamespace = $defaultNamespace;
 136
 137                 static $cachedcount = 0 ;
 138                 if( $t->secureAndSplit() ) {
 139                         if( $defaultNamespace == NS_MAIN ) {
 140                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 141                                         # Avoid memory leaks on mass operations...
 142                                         Title::$titleCache = array();
 143                                         $cachedcount=0;
 144                                 }
 145                                 $cachedcount++;
 146                                 Title::$titleCache[$text] =& $t;
 147                         }
 148                         return $t;
 149                 } else {
 150                         $ret = NULL;
 151                         return $ret;
 152                 }
 153         }
 154
 155         /**
 156          * Create a new Title from URL-encoded text. Ensures that
 157          * the given title's length does not exceed the maximum.
 158          * @param string $url the title, as might be taken from a URL
 159          * @return Title the new object, or NULL on an error
 160          * @static
 161          * @access public
 162          */
 163         public static function newFromURL( $url ) {
 164                 global $wgLegalTitleChars;
 165                 $t = new Title();
 166
 167                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 168                 # but some URLs used it as a space replacement and they still come
 169                 # from some external search tools.
 170                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 171                         $url = str_replace( '+', ' ', $url );
 172                 }
 173
 174                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 175                 if( $t->secureAndSplit() ) {
 176                         return $t;
 177                 } else {
 178                         return NULL;
 179                 }
 180         }
 181
 182         /**
 183          * Create a new Title from an article ID
 184          *
 185          * @todo This is inefficiently implemented, the page row is requested
 186          *       but not used for anything else
 187          *
 188          * @param int $id the page_id corresponding to the Title to create
 189          * @return Title the new object, or NULL on an error
 190          * @access public
 191          * @static
 192          */
 193         function newFromID( $id ) {
 194                 $fname = 'Title::newFromID';
 195                 $dbr =& wfGetDB( DB_SLAVE );
 196                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 197                         array( 'page_id' => $id ), $fname );
 198                 if ( $row !== false ) {
 199                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 200                 } else {
 201                         $title = NULL;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Make an array of titles from an array of IDs
 208          */
 209         function newFromIDs( $ids ) {
 210                 $dbr =& wfGetDB( DB_SLAVE );
 211                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 212                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 213
 214                 $titles = array();
 215                 while ( $row = $dbr->fetchObject( $res ) ) {
 216                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 217                 }
 218                 return $titles;
 219         }
 220
 221         /**
 222          * Create a new Title from a namespace index and a DB key.
 223          * It's assumed that $ns and $title are *valid*, for instance when
 224          * they came directly from the database or a special page name.
 225          * For convenience, spaces are converted to underscores so that
 226          * eg user_text fields can be used directly.
 227          *
 228          * @param int $ns the namespace of the article
 229          * @param string $title the unprefixed database key form
 230          * @return Title the new object
 231          * @static
 232          * @access public
 233          */
 234         public static function &makeTitle( $ns, $title ) {
 235                 $t = new Title();
 236                 $t->mInterwiki = '';
 237                 $t->mFragment = '';
 238                 $t->mNamespace = intval( $ns );
 239                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 240                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 241                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 242                 $t->mTextform = str_replace( '_', ' ', $title );
 243                 return $t;
 244         }
 245
 246         /**
 247          * Create a new Title from a namespace index and a DB key.
 248          * The parameters will be checked for validity, which is a bit slower
 249          * than makeTitle() but safer for user-provided data.
 250          *
 251          * @param int $ns the namespace of the article
 252          * @param string $title the database key form
 253          * @return Title the new object, or NULL on an error
 254          * @static
 255          * @access public
 256          */
 257         public static function makeTitleSafe( $ns, $title ) {
 258                 $t = new Title();
 259                 $t->mDbkeyform = Title::makeName( $ns, $title );
 260                 if( $t->secureAndSplit() ) {
 261                         return $t;
 262                 } else {
 263                         return NULL;
 264                 }
 265         }
 266
 267         /**
 268          * Create a new Title for the Main Page
 269          *
 270          * @static
 271          * @return Title the new object
 272          * @access public
 273          */
 274         public static function newMainPage() {
 275                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 276         }
 277
 278         /**
 279          * Create a new Title for a redirect
 280          * @param string $text the redirect title text
 281          * @return Title the new object, or NULL if the text is not a
 282          *      valid redirect
 283          * @static
 284          * @access public
 285          */
 286         public static function newFromRedirect( $text ) {
 287                 $mwRedir = MagicWord::get( 'redirect' );
 288                 $rt = NULL;
 289                 if ( $mwRedir->matchStart( $text ) ) {
 290                         $m = array();
 291                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 292                                 # categories are escaped using : for example one can enter:
 293                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 294                                 if ( substr($m[1],0,1) == ':') {
 295                                         # We don't want to keep the ':'
 296                                         $m[1] = substr( $m[1], 1 );
 297                                 }
 298
 299                                 $rt = Title::newFromText( $m[1] );
 300                                 # Disallow redirects to Special:Userlogout
 301                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 302                                         $rt = NULL;
 303                                 }
 304                         }
 305                 }
 306                 return $rt;
 307         }
 308
 309 #----------------------------------------------------------------------------
 310 #       Static functions
 311 #----------------------------------------------------------------------------
 312
 313         /**
 314          * Get the prefixed DB key associated with an ID
 315          * @param int $id the page_id of the article
 316          * @return Title an object representing the article, or NULL
 317          *      if no such article was found
 318          * @static
 319          * @access public
 320          */
 321         function nameOf( $id ) {
 322                 $fname = 'Title::nameOf';
 323                 $dbr =& wfGetDB( DB_SLAVE );
 324
 325                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 326                 if ( $s === false ) { return NULL; }
 327
 328                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 329                 return $n;
 330         }
 331
 332         /**
 333          * Get a regex character class describing the legal characters in a link
 334          * @return string the list of characters, not delimited
 335          * @static
 336          * @access public
 337          */
 338         public static function legalChars() {
 339                 global $wgLegalTitleChars;
 340                 return $wgLegalTitleChars;
 341         }
 342
 343         /**
 344          * Get a string representation of a title suitable for
 345          * including in a search index
 346          *
 347          * @param int $ns a namespace index
 348          * @param string $title text-form main part
 349          * @return string a stripped-down title string ready for the
 350          *      search index
 351          */
 352         /* static */ function indexTitle( $ns, $title ) {
 353                 global $wgContLang;
 354
 355                 $lc = SearchEngine::legalSearchChars() . '&#;';
 356                 $t = $wgContLang->stripForSearch( $title );
 357                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 358                 $t = $wgContLang->lc( $t );
 359
 360                 # Handle 's, s'
 361                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 362                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 363
 364                 $t = preg_replace( "/\\s+/", ' ', $t );
 365
 366                 if ( $ns == NS_IMAGE ) {
 367                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 368                 }
 369                 return trim( $t );
 370         }
 371
 372         /*
 373          * Make a prefixed DB key from a DB key and a namespace index
 374          * @param int $ns numerical representation of the namespace
 375          * @param string $title the DB key form the title
 376          * @return string the prefixed form of the title
 377          */
 378         public static function makeName( $ns, $title ) {
 379                 global $wgContLang;
 380
 381                 $n = $wgContLang->getNsText( $ns );
 382                 return $n == '' ? $title : "$n:$title";
 383         }
 384
 385         /**
 386          * Returns the URL associated with an interwiki prefix
 387          * @param string $key the interwiki prefix (e.g. "MeatBall")
 388          * @return the associated URL, containing "$1", which should be
 389          *      replaced by an article title
 390          * @static (arguably)
 391          * @access public
 392          */
 393         function getInterwikiLink( $key )  {
 394                 global $wgMemc, $wgInterwikiExpiry;
 395                 global $wgInterwikiCache, $wgContLang;
 396                 $fname = 'Title::getInterwikiLink';
 397
 398                 $key = $wgContLang->lc( $key );
 399
 400                 $k = wfMemcKey( 'interwiki', $key );
 401                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 402                         return Title::$interwikiCache[$k]->iw_url;
 403                 }
 404
 405                 if ($wgInterwikiCache) {
 406                         return Title::getInterwikiCached( $key );
 407                 }
 408
 409                 $s = $wgMemc->get( $k );
 410                 # Ignore old keys with no iw_local
 411                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 412                         Title::$interwikiCache[$k] = $s;
 413                         return $s->iw_url;
 414                 }
 415
 416                 $dbr =& wfGetDB( DB_SLAVE );
 417                 $res = $dbr->select( 'interwiki',
 418                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 419                         array( 'iw_prefix' => $key ), $fname );
 420                 if( !$res ) {
 421                         return '';
 422                 }
 423
 424                 $s = $dbr->fetchObject( $res );
 425                 if( !$s ) {
 426                         # Cache non-existence: create a blank object and save it to memcached
 427                         $s = (object)false;
 428                         $s->iw_url = '';
 429                         $s->iw_local = 0;
 430                         $s->iw_trans = 0;
 431                 }
 432                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 433                 Title::$interwikiCache[$k] = $s;
 434
 435                 return $s->iw_url;
 436         }
 437
 438         /**
 439          * Fetch interwiki prefix data from local cache in constant database
 440          *
 441          * More logic is explained in DefaultSettings
 442          *
 443          * @return string URL of interwiki site
 444          * @access public
 445          */
 446         function getInterwikiCached( $key ) {
 447                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 448                 static $db, $site;
 449
 450                 if (!$db)
 451                         $db=dba_open($wgInterwikiCache,'r','cdb');
 452                 /* Resolve site name */
 453                 if ($wgInterwikiScopes>=3 and !$site) {
 454                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 455                         if ($site=="")
 456                                 $site = $wgInterwikiFallbackSite;
 457                 }
 458                 $value = dba_fetch( wfMemcKey( $key ), $db);
 459                 if ($value=='' and $wgInterwikiScopes>=3) {
 460                         /* try site-level */
 461                         $value = dba_fetch("_{$site}:{$key}", $db);
 462                 }
 463                 if ($value=='' and $wgInterwikiScopes>=2) {
 464                         /* try globals */
 465                         $value = dba_fetch("__global:{$key}", $db);
 466                 }
 467                 if ($value=='undef')
 468                         $value='';
 469                 $s = (object)false;
 470                 $s->iw_url = '';
 471                 $s->iw_local = 0;
 472                 $s->iw_trans = 0;
 473                 if ($value!='') {
 474                         list($local,$url)=explode(' ',$value,2);
 475                         $s->iw_url=$url;
 476                         $s->iw_local=(int)$local;
 477                 }
 478                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 479                 return $s->iw_url;
 480         }
 481         /**
 482          * Determine whether the object refers to a page within
 483          * this project.
 484          *
 485          * @return bool TRUE if this is an in-project interwiki link
 486          *      or a wikilink, FALSE otherwise
 487          * @access public
 488          */
 489         function isLocal() {
 490                 if ( $this->mInterwiki != '' ) {
 491                         # Make sure key is loaded into cache
 492                         $this->getInterwikiLink( $this->mInterwiki );
 493                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 494                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 495                 } else {
 496                         return true;
 497                 }
 498         }
 499
 500         /**
 501          * Determine whether the object refers to a page within
 502          * this project and is transcludable.
 503          *
 504          * @return bool TRUE if this is transcludable
 505          * @access public
 506          */
 507         function isTrans() {
 508                 if ($this->mInterwiki == '')
 509                         return false;
 510                 # Make sure key is loaded into cache
 511                 $this->getInterwikiLink( $this->mInterwiki );
 512                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 513                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 514         }
 515
 516         /**
 517          * Update the page_touched field for an array of title objects
 518          * @todo Inefficient unless the IDs are already loaded into the
 519          *      link cache
 520          * @param array $titles an array of Title objects to be touched
 521          * @param string $timestamp the timestamp to use instead of the
 522          *      default current time
 523          * @static
 524          * @access public
 525          */
 526         function touchArray( $titles, $timestamp = '' ) {
 527
 528                 if ( count( $titles ) == 0 ) {
 529                         return;
 530                 }
 531                 $dbw =& wfGetDB( DB_MASTER );
 532                 if ( $timestamp == '' ) {
 533                         $timestamp = $dbw->timestamp();
 534                 }
 535                 /*
 536                 $page = $dbw->tableName( 'page' );
 537                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 538                 $first = true;
 539
 540                 foreach ( $titles as $title ) {
 541                         if ( $wgUseFileCache ) {
 542                                 $cm = new HTMLFileCache($title);
 543                                 @unlink($cm->fileCacheName());
 544                         }
 545
 546                         if ( ! $first ) {
 547                                 $sql .= ',';
 548                         }
 549                         $first = false;
 550                         $sql .= $title->getArticleID();
 551                 }
 552                 $sql .= ')';
 553                 if ( ! $first ) {
 554                         $dbw->query( $sql, 'Title::touchArray' );
 555                 }
 556                 */
 557                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 558                 // do them in small chunks:
 559                 $fname = 'Title::touchArray';
 560                 foreach( $titles as $title ) {
 561                         $dbw->update( 'page',
 562                                 array( 'page_touched' => $timestamp ),
 563                                 array(
 564                                         'page_namespace' => $title->getNamespace(),
 565                                         'page_title'     => $title->getDBkey() ),
 566                                 $fname );
 567                 }
 568         }
 569
 570         /**
 571          * Escape a text fragment, say from a link, for a URL
 572          */
 573         static function escapeFragmentForURL( $fragment ) {
 574                 $fragment = str_replace( ' ', '_', $fragment );
 575                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 576                 $replaceArray = array(
 577                         '%3A' => ':',
 578                         '%' => '.'
 579                 );
 580                 return strtr( $fragment, $replaceArray );
 581         }
 582
 583 #----------------------------------------------------------------------------
 584 #       Other stuff
 585 #----------------------------------------------------------------------------
 586
 587         /** Simple accessors */
 588         /**
 589          * Get the text form (spaces not underscores) of the main part
 590          * @return string
 591          * @access public
 592          */
 593         function getText() { return $this->mTextform; }
 594         /**
 595          * Get the URL-encoded form of the main part
 596          * @return string
 597          * @access public
 598          */
 599         function getPartialURL() { return $this->mUrlform; }
 600         /**
 601          * Get the main part with underscores
 602          * @return string
 603          * @access public
 604          */
 605         function getDBkey() { return $this->mDbkeyform; }
 606         /**
 607          * Get the namespace index, i.e. one of the NS_xxxx constants
 608          * @return int
 609          * @access public
 610          */
 611         function getNamespace() { return $this->mNamespace; }
 612         /**
 613          * Get the namespace text
 614          * @return string
 615          * @access public
 616          */
 617         function getNsText() {
 618                 global $wgContLang, $wgCanonicalNamespaceNames;
 619
 620                 if ( '' != $this->mInterwiki ) {
 621                         // This probably shouldn't even happen. ohh man, oh yuck.
 622                         // But for interwiki transclusion it sometimes does.
 623                         // Shit. Shit shit shit.
 624                         //
 625                         // Use the canonical namespaces if possible to try to
 626                         // resolve a foreign namespace.
 627                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 628                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 629                         }
 630                 }
 631                 return $wgContLang->getNsText( $this->mNamespace );
 632         }
 633         /**
 634          * Get the namespace text of the subject (rather than talk) page
 635          * @return string
 636          * @access public
 637          */
 638         function getSubjectNsText() {
 639                 global $wgContLang;
 640                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 641         }
 642
 643         /**
 644          * Get the namespace text of the talk page
 645          * @return string
 646          */
 647         function getTalkNsText() {
 648                 global $wgContLang;
 649                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 650         }
 651
 652         /**
 653          * Could this title have a corresponding talk page?
 654          * @return bool
 655          */
 656         function canTalk() {
 657                 return( Namespace::canTalk( $this->mNamespace ) );
 658         }
 659
 660         /**
 661          * Get the interwiki prefix (or null string)
 662          * @return string
 663          * @access public
 664          */
 665         function getInterwiki() { return $this->mInterwiki; }
 666         /**
 667          * Get the Title fragment (i.e. the bit after the #) in text form
 668          * @return string
 669          * @access public
 670          */
 671         function getFragment() { return $this->mFragment; }
 672         /**
 673          * Get the fragment in URL form, including the "#" character if there is one
 674          *
 675          * @return string
 676          * @access public
 677          */
 678         function getFragmentForURL() {
 679                 if ( $this->mFragment == '' ) {
 680                         return '';
 681                 } else {
 682                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 683                 }
 684         }
 685         /**
 686          * Get the default namespace index, for when there is no namespace
 687          * @return int
 688          * @access public
 689          */
 690         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 691
 692         /**
 693          * Get title for search index
 694          * @return string a stripped-down title string ready for the
 695          *      search index
 696          */
 697         function getIndexTitle() {
 698                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 699         }
 700
 701         /**
 702          * Get the prefixed database key form
 703          * @return string the prefixed title, with underscores and
 704          *      any interwiki and namespace prefixes
 705          * @access public
 706          */
 707         function getPrefixedDBkey() {
 708                 $s = $this->prefix( $this->mDbkeyform );
 709                 $s = str_replace( ' ', '_', $s );
 710                 return $s;
 711         }
 712
 713         /**
 714          * Get the prefixed title with spaces.
 715          * This is the form usually used for display
 716          * @return string the prefixed title, with spaces
 717          * @access public
 718          */
 719         function getPrefixedText() {
 720                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 721                         $s = $this->prefix( $this->mTextform );
 722                         $s = str_replace( '_', ' ', $s );
 723                         $this->mPrefixedText = $s;
 724                 }
 725                 return $this->mPrefixedText;
 726         }
 727
 728         /**
 729          * Get the prefixed title with spaces, plus any fragment
 730          * (part beginning with '#')
 731          * @return string the prefixed title, with spaces and
 732          *      the fragment, including '#'
 733          * @access public
 734          */
 735         function getFullText() {
 736                 $text = $this->getPrefixedText();
 737                 if( '' != $this->mFragment ) {
 738                         $text .= '#' . $this->mFragment;
 739                 }
 740                 return $text;
 741         }
 742
 743         /**
 744          * Get the base name, i.e. the leftmost parts before the /
 745          * @return string Base name
 746          */
 747         function getBaseText() {
 748                 global $wgNamespacesWithSubpages;
 749                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 750                         $parts = explode( '/', $this->getText() );
 751                         # Don't discard the real title if there's no subpage involved
 752                         if( count( $parts ) > 1 )
 753                                 unset( $parts[ count( $parts ) - 1 ] );
 754                         return implode( '/', $parts );
 755                 } else {
 756                         return $this->getText();
 757                 }
 758         }
 759
 760         /**
 761          * Get the lowest-level subpage name, i.e. the rightmost part after /
 762          * @return string Subpage name
 763          */
 764         function getSubpageText() {
 765                 global $wgNamespacesWithSubpages;
 766                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 767                         $parts = explode( '/', $this->mTextform );
 768                         return( $parts[ count( $parts ) - 1 ] );
 769                 } else {
 770                         return( $this->mTextform );
 771                 }
 772         }
 773
 774         /**
 775          * Get a URL-encoded form of the subpage text
 776          * @return string URL-encoded subpage name
 777          */
 778         function getSubpageUrlForm() {
 779                 $text = $this->getSubpageText();
 780                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 781                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 782                 return( $text );
 783         }
 784
 785         /**
 786          * Get a URL-encoded title (not an actual URL) including interwiki
 787          * @return string the URL-encoded form
 788          * @access public
 789          */
 790         function getPrefixedURL() {
 791                 $s = $this->prefix( $this->mDbkeyform );
 792                 $s = str_replace( ' ', '_', $s );
 793
 794                 $s = wfUrlencode ( $s ) ;
 795
 796                 # Cleaning up URL to make it look nice -- is this safe?
 797                 $s = str_replace( '%28', '(', $s );
 798                 $s = str_replace( '%29', ')', $s );
 799
 800                 return $s;
 801         }
 802
 803         /**
 804          * Get a real URL referring to this title, with interwiki link and
 805          * fragment
 806          *
 807          * @param string $query an optional query string, not used
 808          *      for interwiki links
 809          * @param string $variant language variant of url (for sr, zh..)
 810          * @return string the URL
 811          * @access public
 812          */
 813         function getFullURL( $query = '', $variant = false ) {
 814                 global $wgContLang, $wgServer, $wgRequest;
 815
 816                 if ( '' == $this->mInterwiki ) {
 817                         $url = $this->getLocalUrl( $query, $variant );
 818
 819                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 820                         // Correct fix would be to move the prepending elsewhere.
 821                         if ($wgRequest->getVal('action') != 'render') {
 822                                 $url = $wgServer . $url;
 823                         }
 824                 } else {
 825                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 826
 827                         $namespace = wfUrlencode( $this->getNsText() );
 828                         if ( '' != $namespace ) {
 829                                 # Can this actually happen? Interwikis shouldn't be parsed.
 830                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 831                                 $namespace .= ':';
 832                         }
 833                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 834                         if( $query != '' ) {
 835                                 if( false === strpos( $url, '?' ) ) {
 836                                         $url .= '?';
 837                                 } else {
 838                                         $url .= '&';
 839                                 }
 840                                 $url .= $query;
 841                         }
 842                 }
 843
 844                 # Finally, add the fragment.
 845                 $url .= $this->getFragmentForURL();
 846
 847                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 848                 return $url;
 849         }
 850
 851         /**
 852          * Get a URL with no fragment or server name.  If this page is generated
 853          * with action=render, $wgServer is prepended.
 854          * @param string $query an optional query string; if not specified,
 855          *      $wgArticlePath will be used.
 856          * @param string $variant language variant of url (for sr, zh..)
 857          * @return string the URL
 858          * @access public
 859          */
 860         function getLocalURL( $query = '', $variant = false ) {
 861                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 862                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 863
 864                 // internal links should point to same variant as current page (only anonymous users)
 865                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 866                         $pref = $wgContLang->getPreferredVariant(false);
 867                         if($pref != $wgContLang->getCode())
 868                                 $variant = $pref;
 869                 }
 870
 871                 if ( $this->isExternal() ) {
 872                         $url = $this->getFullURL();
 873                         if ( $query ) {
 874                                 // This is currently only used for edit section links in the
 875                                 // context of interwiki transclusion. In theory we should
 876                                 // append the query to the end of any existing query string,
 877                                 // but interwiki transclusion is already broken in that case.
 878                                 $url .= "?$query";
 879                         }
 880                 } else {
 881                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 882                         if ( $query == '' ) {
 883                                 if($variant!=false && $wgContLang->hasVariants()){
 884                                         if($wgVariantArticlePath==false)
 885                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 886                                         else
 887                                                 $variantArticlePath = $wgVariantArticlePath;
 888
 889                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 890                                         $url = str_replace( '$1', $dbkey, $url  );
 891
 892                                 }
 893                                 else
 894                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 895                         } else {
 896                                 global $wgActionPaths;
 897                                 $url = false;
 898                                 $matches = array();
 899                                 if( !empty( $wgActionPaths ) &&
 900                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 901                                 {
 902                                         $action = urldecode( $matches[2] );
 903                                         if( isset( $wgActionPaths[$action] ) ) {
 904                                                 $query = $matches[1];
 905                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 906                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 907                                                 if( $query != '' ) $url .= '?' . $query;
 908                                         }
 909                                 }
 910                                 if ( $url === false ) {
 911                                         if ( $query == '-' ) {
 912                                                 $query = '';
 913                                         }
 914                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 915                                 }
 916                         }
 917
 918                         // FIXME: this causes breakage in various places when we
 919                         // actually expected a local URL and end up with dupe prefixes.
 920                         if ($wgRequest->getVal('action') == 'render') {
 921                                 $url = $wgServer . $url;
 922                         }
 923                 }
 924                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 925                 return $url;
 926         }
 927
 928         /**
 929          * Get an HTML-escaped version of the URL form, suitable for
 930          * using in a link, without a server name or fragment
 931          * @param string $query an optional query string
 932          * @return string the URL
 933          * @access public
 934          */
 935         function escapeLocalURL( $query = '' ) {
 936                 return htmlspecialchars( $this->getLocalURL( $query ) );
 937         }
 938
 939         /**
 940          * Get an HTML-escaped version of the URL form, suitable for
 941          * using in a link, including the server name and fragment
 942          *
 943          * @return string the URL
 944          * @param string $query an optional query string
 945          * @access public
 946          */
 947         function escapeFullURL( $query = '' ) {
 948                 return htmlspecialchars( $this->getFullURL( $query ) );
 949         }
 950
 951         /**
 952          * Get the URL form for an internal link.
 953          * - Used in various Squid-related code, in case we have a different
 954          * internal hostname for the server from the exposed one.
 955          *
 956          * @param string $query an optional query string
 957          * @param string $variant language variant of url (for sr, zh..)
 958          * @return string the URL
 959          * @access public
 960          */
 961         function getInternalURL( $query = '', $variant = false ) {
 962                 global $wgInternalServer;
 963                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 964                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 965                 return $url;
 966         }
 967
 968         /**
 969          * Get the edit URL for this Title
 970          * @return string the URL, or a null string if this is an
 971          *      interwiki link
 972          * @access public
 973          */
 974         function getEditURL() {
 975                 if ( '' != $this->mInterwiki ) { return ''; }
 976                 $s = $this->getLocalURL( 'action=edit' );
 977
 978                 return $s;
 979         }
 980
 981         /**
 982          * Get the HTML-escaped displayable text form.
 983          * Used for the title field in <a> tags.
 984          * @return string the text, including any prefixes
 985          * @access public
 986          */
 987         function getEscapedText() {
 988                 return htmlspecialchars( $this->getPrefixedText() );
 989         }
 990
 991         /**
 992          * Is this Title interwiki?
 993          * @return boolean
 994          * @access public
 995          */
 996         function isExternal() { return ( '' != $this->mInterwiki ); }
 997
 998         /**
 999          * Is this page "semi-protected" - the *only* protection is autoconfirm?
1000          *
1001          * @param string Action to check (default: edit)
1002          * @return bool
1003          */
1004         function isSemiProtected( $action = 'edit' ) {
1005                 if( $this->exists() ) {
1006                         $restrictions = $this->getRestrictions( $action );
1007                         if( count( $restrictions ) > 0 ) {
1008                                 foreach( $restrictions as $restriction ) {
1009                                         if( strtolower( $restriction ) != 'autoconfirmed' )
1010                                                 return false;
1011                                 }
1012                         } else {
1013                                 # Not protected
1014                                 return false;
1015                         }
1016                         return true;
1017                 } else {
1018                         # If it doesn't exist, it can't be protected
1019                         return false;
1020                 }
1021         }
1022
1023         /**
1024          * Does the title correspond to a protected article?
1025          * @param string $what the action the page is protected from,
1026          *      by default checks move and edit
1027          * @return boolean
1028          * @access public
1029          */
1030         function isProtected( $action = '' ) {
1031                 global $wgRestrictionLevels;
1032                 if ( NS_SPECIAL == $this->mNamespace ) { return true; }
1033
1034                 if( $action == 'edit' || $action == '' ) {
1035                         $r = $this->getRestrictions( 'edit' );
1036                         foreach( $wgRestrictionLevels as $level ) {
1037                                 if( in_array( $level, $r ) && $level != '' ) {
1038                                         return( true );
1039                                 }
1040                         }
1041                 }
1042
1043                 if( $action == 'move' || $action == '' ) {
1044                         $r = $this->getRestrictions( 'move' );
1045                         foreach( $wgRestrictionLevels as $level ) {
1046                                 if( in_array( $level, $r ) && $level != '' ) {
1047                                         return( true );
1048                                 }
1049                         }
1050                 }
1051
1052                 return false;
1053         }
1054
1055         /**
1056          * Is $wgUser is watching this page?
1057          * @return boolean
1058          * @access public
1059          */
1060         function userIsWatching() {
1061                 global $wgUser;
1062
1063                 if ( is_null( $this->mWatched ) ) {
1064                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1065                                 $this->mWatched = false;
1066                         } else {
1067                                 $this->mWatched = $wgUser->isWatched( $this );
1068                         }
1069                 }
1070                 return $this->mWatched;
1071         }
1072
1073         /**
1074          * Can $wgUser perform $action this page?
1075          * @param string $action action that permission needs to be checked for
1076          * @return boolean
1077          * @private
1078          */
1079         function userCan($action) {
1080                 $fname = 'Title::userCan';
1081                 wfProfileIn( $fname );
1082
1083                 global $wgUser;
1084
1085                 $result = null;
1086                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1087                 if ( $result !== null ) {
1088                         wfProfileOut( $fname );
1089                         return $result;
1090                 }
1091
1092                 if( NS_SPECIAL == $this->mNamespace ) {
1093                         wfProfileOut( $fname );
1094                         return false;
1095                 }
1096                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
1097                 // from taking effect -ævar
1098                 if( NS_MEDIAWIKI == $this->mNamespace &&
1099                     !$wgUser->isAllowed('editinterface') ) {
1100                         wfProfileOut( $fname );
1101                         return false;
1102                 }
1103
1104                 if( $this->mDbkeyform == '_' ) {
1105                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1106                         wfProfileOut( $fname );
1107                         return false;
1108                 }
1109
1110                 # protect css/js subpages of user pages
1111                 # XXX: this might be better using restrictions
1112                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1113                 if( $this->isCssJsSubpage()
1114                         && !$wgUser->isAllowed('editinterface')
1115                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1116                         wfProfileOut( $fname );
1117                         return false;
1118                 }
1119
1120                 foreach( $this->getRestrictions($action) as $right ) {
1121                         // Backwards compatibility, rewrite sysop -> protect
1122                         if ( $right == 'sysop' ) {
1123                                 $right = 'protect';
1124                         }
1125                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1126                                 wfProfileOut( $fname );
1127                                 return false;
1128                         }
1129                 }
1130
1131                 if( $action == 'move' &&
1132                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1133                         wfProfileOut( $fname );
1134                         return false;
1135                 }
1136
1137                 if( $action == 'create' ) {
1138                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1139                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1140                                 wfProfileOut( $fname );
1141                                 return false;
1142                         }
1143                 }
1144
1145                 wfProfileOut( $fname );
1146                 return true;
1147         }
1148
1149         /**
1150          * Can $wgUser edit this page?
1151          * @return boolean
1152          * @access public
1153          */
1154         function userCanEdit() {
1155                 return $this->userCan('edit');
1156         }
1157
1158         /**
1159          * Can $wgUser create this page?
1160          * @return boolean
1161          * @access public
1162          */
1163         function userCanCreate() {
1164                 return $this->userCan('create');
1165         }
1166
1167         /**
1168          * Can $wgUser move this page?
1169          * @return boolean
1170          * @access public
1171          */
1172         function userCanMove() {
1173                 return $this->userCan('move');
1174         }
1175
1176         /**
1177          * Would anybody with sufficient privileges be able to move this page?
1178          * Some pages just aren't movable.
1179          *
1180          * @return boolean
1181          * @access public
1182          */
1183         function isMovable() {
1184                 return Namespace::isMovable( $this->getNamespace() )
1185                         && $this->getInterwiki() == '';
1186         }
1187
1188         /**
1189          * Can $wgUser read this page?
1190          * @return boolean
1191          * @access public
1192          */
1193         function userCanRead() {
1194                 global $wgUser;
1195
1196                 $result = null;
1197                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1198                 if ( $result !== null ) {
1199                         return $result;
1200                 }
1201
1202                 if( $wgUser->isAllowed('read') ) {
1203                         return true;
1204                 } else {
1205                         global $wgWhitelistRead;
1206
1207                         /**
1208                          * Always grant access to the login page.
1209                          * Even anons need to be able to log in.
1210                         */
1211                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1212                                 return true;
1213                         }
1214
1215                         /** some pages are explicitly allowed */
1216                         $name = $this->getPrefixedText();
1217                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1218                                 return true;
1219                         }
1220
1221                         # Compatibility with old settings
1222                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1223                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1224                                         return true;
1225                                 }
1226                         }
1227                 }
1228                 return false;
1229         }
1230
1231         /**
1232          * Is this a talk page of some sort?
1233          * @return bool
1234          * @access public
1235          */
1236         function isTalkPage() {
1237                 return Namespace::isTalk( $this->getNamespace() );
1238         }
1239
1240         /**
1241          * Is this a subpage?
1242          * @return bool
1243          * @access public
1244          */
1245         function isSubpage() {
1246                 global $wgNamespacesWithSubpages;
1247
1248                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1249                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1250                 } else {
1251                         return false;
1252                 }
1253         }
1254
1255         /**
1256          * Is this a .css or .js subpage of a user page?
1257          * @return bool
1258          * @access public
1259          */
1260         function isCssJsSubpage() {
1261                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(css|js)$/", $this->mTextform ) );
1262         }
1263         /**
1264          * Is this a *valid* .css or .js subpage of a user page?
1265          * Check that the corresponding skin exists
1266          */
1267         function isValidCssJsSubpage() {
1268                 if ( $this->isCssJsSubpage() ) {
1269                         $skinNames = Skin::getSkinNames();
1270                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1271                 } else {
1272                         return false;
1273                 }
1274         }
1275         /**
1276          * Trim down a .css or .js subpage title to get the corresponding skin name
1277          */
1278         function getSkinFromCssJsSubpage() {
1279                 $subpage = explode( '/', $this->mTextform );
1280                 $subpage = $subpage[ count( $subpage ) - 1 ];
1281                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1282         }
1283         /**
1284          * Is this a .css subpage of a user page?
1285          * @return bool
1286          * @access public
1287          */
1288         function isCssSubpage() {
1289                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1290         }
1291         /**
1292          * Is this a .js subpage of a user page?
1293          * @return bool
1294          * @access public
1295          */
1296         function isJsSubpage() {
1297                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1298         }
1299         /**
1300          * Protect css/js subpages of user pages: can $wgUser edit
1301          * this page?
1302          *
1303          * @return boolean
1304          * @todo XXX: this might be better using restrictions
1305          * @access public
1306          */
1307         function userCanEditCssJsSubpage() {
1308                 global $wgUser;
1309                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1310         }
1311
1312         /**
1313          * Loads a string into mRestrictions array
1314          * @param string $res restrictions in string format
1315          * @access public
1316          */
1317         function loadRestrictions( $res ) {
1318                 $this->mRestrictions['edit'] = array();
1319                 $this->mRestrictions['move'] = array();
1320
1321                 if( !$res ) {
1322                         # No restrictions (page_restrictions blank)
1323                         $this->mRestrictionsLoaded = true;
1324                         return;
1325                 }
1326
1327                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1328                         $temp = explode( '=', trim( $restrict ) );
1329                         if(count($temp) == 1) {
1330                                 // old format should be treated as edit/move restriction
1331                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1332                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1333                         } else {
1334                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1335                         }
1336                 }
1337                 $this->mRestrictionsLoaded = true;
1338         }
1339
1340         /**
1341          * Accessor/initialisation for mRestrictions
1342          *
1343          * @access public
1344          * @param string $action action that permission needs to be checked for
1345          * @return array the array of groups allowed to edit this article
1346          */
1347         function getRestrictions( $action ) {
1348                 if( $this->exists() ) {
1349                         if( !$this->mRestrictionsLoaded ) {
1350                                 $dbr =& wfGetDB( DB_SLAVE );
1351                                 $res = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ) );
1352                                 $this->loadRestrictions( $res );
1353                         }
1354                         return isset( $this->mRestrictions[$action] )
1355                                         ? $this->mRestrictions[$action]
1356                                         : array();
1357                 } else {
1358                         return array();
1359                 }
1360         }
1361
1362         /**
1363          * Is there a version of this page in the deletion archive?
1364          * @return int the number of archived revisions
1365          * @access public
1366          */
1367         function isDeleted() {
1368                 $fname = 'Title::isDeleted';
1369                 if ( $this->getNamespace() < 0 ) {
1370                         $n = 0;
1371                 } else {
1372                         $dbr =& wfGetDB( DB_SLAVE );
1373                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1374                                 'ar_title' => $this->getDBkey() ), $fname );
1375                         if( $this->getNamespace() == NS_IMAGE ) {
1376                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1377                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1378                         }
1379                 }
1380                 return (int)$n;
1381         }
1382
1383         /**
1384          * Get the article ID for this Title from the link cache,
1385          * adding it if necessary
1386          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1387          *      for update
1388          * @return int the ID
1389          * @access public
1390          */
1391         function getArticleID( $flags = 0 ) {
1392                 $linkCache =& LinkCache::singleton();
1393                 if ( $flags & GAID_FOR_UPDATE ) {
1394                         $oldUpdate = $linkCache->forUpdate( true );
1395                         $this->mArticleID = $linkCache->addLinkObj( $this );
1396                         $linkCache->forUpdate( $oldUpdate );
1397                 } else {
1398                         if ( -1 == $this->mArticleID ) {
1399                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1400                         }
1401                 }
1402                 return $this->mArticleID;
1403         }
1404
1405         function getLatestRevID() {
1406                 if ($this->mLatestID !== false)
1407                         return $this->mLatestID;
1408
1409                 $db =& wfGetDB(DB_SLAVE);
1410                 return $this->mLatestID = $db->selectField( 'revision',
1411                         "max(rev_id)",
1412                         array('rev_page' => $this->getArticleID()),
1413                         'Title::getLatestRevID' );
1414         }
1415
1416         /**
1417          * This clears some fields in this object, and clears any associated
1418          * keys in the "bad links" section of the link cache.
1419          *
1420          * - This is called from Article::insertNewArticle() to allow
1421          * loading of the new page_id. It's also called from
1422          * Article::doDeleteArticle()
1423          *
1424          * @param int $newid the new Article ID
1425          * @access public
1426          */
1427         function resetArticleID( $newid ) {
1428                 $linkCache =& LinkCache::singleton();
1429                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1430
1431                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1432                 else { $this->mArticleID = $newid; }
1433                 $this->mRestrictionsLoaded = false;
1434                 $this->mRestrictions = array();
1435         }
1436
1437         /**
1438          * Updates page_touched for this page; called from LinksUpdate.php
1439          * @return bool true if the update succeded
1440          * @access public
1441          */
1442         function invalidateCache() {
1443                 global $wgUseFileCache;
1444
1445                 if ( wfReadOnly() ) {
1446                         return;
1447                 }
1448
1449                 $dbw =& wfGetDB( DB_MASTER );
1450                 $success = $dbw->update( 'page',
1451                         array( /* SET */
1452                                 'page_touched' => $dbw->timestamp()
1453                         ), array( /* WHERE */
1454                                 'page_namespace' => $this->getNamespace() ,
1455                                 'page_title' => $this->getDBkey()
1456                         ), 'Title::invalidateCache'
1457                 );
1458
1459                 if ($wgUseFileCache) {
1460                         $cache = new HTMLFileCache($this);
1461                         @unlink($cache->fileCacheName());
1462                 }
1463
1464                 return $success;
1465         }
1466
1467         /**
1468          * Prefix some arbitrary text with the namespace or interwiki prefix
1469          * of this object
1470          *
1471          * @param string $name the text
1472          * @return string the prefixed text
1473          * @private
1474          */
1475         /* private */ function prefix( $name ) {
1476                 $p = '';
1477                 if ( '' != $this->mInterwiki ) {
1478                         $p = $this->mInterwiki . ':';
1479                 }
1480                 if ( 0 != $this->mNamespace ) {
1481                         $p .= $this->getNsText() . ':';
1482                 }
1483                 return $p . $name;
1484         }
1485
1486         /**
1487          * Secure and split - main initialisation function for this object
1488          *
1489          * Assumes that mDbkeyform has been set, and is urldecoded
1490          * and uses underscores, but not otherwise munged.  This function
1491          * removes illegal characters, splits off the interwiki and
1492          * namespace prefixes, sets the other forms, and canonicalizes
1493          * everything.
1494          * @return bool true on success
1495          * @private
1496          */
1497         /* private */ function secureAndSplit() {
1498                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1499
1500                 # Initialisation
1501                 static $rxTc = false;
1502                 if( !$rxTc ) {
1503                         # % is needed as well
1504                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1505                 }
1506
1507                 $this->mInterwiki = $this->mFragment = '';
1508                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1509
1510                 $dbkey = $this->mDbkeyform;
1511
1512                 # Strip Unicode bidi override characters.
1513                 # Sometimes they slip into cut-n-pasted page titles, where the
1514                 # override chars get included in list displays.
1515                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1516                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1517
1518                 # Clean up whitespace
1519                 #
1520                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1521                 $dbkey = trim( $dbkey, '_' );
1522
1523                 if ( '' == $dbkey ) {
1524                         return false;
1525                 }
1526
1527                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1528                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1529                         return false;
1530                 }
1531
1532                 $this->mDbkeyform = $dbkey;
1533
1534                 # Initial colon indicates main namespace rather than specified default
1535                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1536                 if ( ':' == $dbkey{0} ) {
1537                         $this->mNamespace = NS_MAIN;
1538                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1539                 }
1540
1541                 # Namespace or interwiki prefix
1542                 $firstPass = true;
1543                 do {
1544                         $m = array();
1545                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1546                                 $p = $m[1];
1547                                 $lowerNs = $wgContLang->lc( $p );
1548                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1549                                         # Canonical namespace
1550                                         $dbkey = $m[2];
1551                                         $this->mNamespace = $ns;
1552                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1553                                         # Ordinary namespace
1554                                         $dbkey = $m[2];
1555                                         $this->mNamespace = $ns;
1556                                 } elseif( $this->getInterwikiLink( $p ) ) {
1557                                         if( !$firstPass ) {
1558                                                 # Can't make a local interwiki link to an interwiki link.
1559                                                 # That's just crazy!
1560                                                 return false;
1561                                         }
1562
1563                                         # Interwiki link
1564                                         $dbkey = $m[2];
1565                                         $this->mInterwiki = $wgContLang->lc( $p );
1566
1567                                         # Redundant interwiki prefix to the local wiki
1568                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1569                                                 if( $dbkey == '' ) {
1570                                                         # Can't have an empty self-link
1571                                                         return false;
1572                                                 }
1573                                                 $this->mInterwiki = '';
1574                                                 $firstPass = false;
1575                                                 # Do another namespace split...
1576                                                 continue;
1577                                         }
1578
1579                                         # If there's an initial colon after the interwiki, that also
1580                                         # resets the default namespace
1581                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1582                                                 $this->mNamespace = NS_MAIN;
1583                                                 $dbkey = substr( $dbkey, 1 );
1584                                         }
1585                                 }
1586                                 # If there's no recognized interwiki or namespace,
1587                                 # then let the colon expression be part of the title.
1588                         }
1589                         break;
1590                 } while( true );
1591
1592                 # We already know that some pages won't be in the database!
1593                 #
1594                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1595                         $this->mArticleID = 0;
1596                 }
1597                 $fragment = strstr( $dbkey, '#' );
1598                 if ( false !== $fragment ) {
1599                         $this->setFragment( $fragment );
1600                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1601                         # remove whitespace again: prevents "Foo_bar_#"
1602                         # becoming "Foo_bar_"
1603                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1604                 }
1605
1606                 # Reject illegal characters.
1607                 #
1608                 if( preg_match( $rxTc, $dbkey ) ) {
1609                         return false;
1610                 }
1611
1612                 /**
1613                  * Pages with "/./" or "/../" appearing in the URLs will
1614                  * often be unreachable due to the way web browsers deal
1615                  * with 'relative' URLs. Forbid them explicitly.
1616                  */
1617                 if ( strpos( $dbkey, '.' ) !== false &&
1618                      ( $dbkey === '.' || $dbkey === '..' ||
1619                        strpos( $dbkey, './' ) === 0  ||
1620                        strpos( $dbkey, '../' ) === 0 ||
1621                        strpos( $dbkey, '/./' ) !== false ||
1622                        strpos( $dbkey, '/../' ) !== false ) )
1623                 {
1624                         return false;
1625                 }
1626
1627                 /**
1628                  * Limit the size of titles to 255 bytes.
1629                  * This is typically the size of the underlying database field.
1630                  * We make an exception for special pages, which don't need to be stored
1631                  * in the database, and may edge over 255 bytes due to subpage syntax
1632                  * for long titles, e.g. [[Special:Block/Long name]]
1633                  */
1634                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1635                   strlen( $dbkey ) > 512 )
1636                 {
1637                         return false;
1638                 }
1639
1640                 /**
1641                  * Normally, all wiki links are forced to have
1642                  * an initial capital letter so [[foo]] and [[Foo]]
1643                  * point to the same place.
1644                  *
1645                  * Don't force it for interwikis, since the other
1646                  * site might be case-sensitive.
1647                  */
1648                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1649                         $dbkey = $wgContLang->ucfirst( $dbkey );
1650                 }
1651
1652                 /**
1653                  * Can't make a link to a namespace alone...
1654                  * "empty" local links can only be self-links
1655                  * with a fragment identifier.
1656                  */
1657                 if( $dbkey == '' &&
1658                         $this->mInterwiki == '' &&
1659                         $this->mNamespace != NS_MAIN ) {
1660                         return false;
1661                 }
1662
1663                 // Any remaining initial :s are illegal.
1664                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1665                         return false;
1666                 }
1667
1668                 # Fill fields
1669                 $this->mDbkeyform = $dbkey;
1670                 $this->mUrlform = wfUrlencode( $dbkey );
1671
1672                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1673
1674                 return true;
1675         }
1676
1677         /**
1678          * Set the fragment for this title
1679          * This is kind of bad, since except for this rarely-used function, Title objects
1680          * are immutable. The reason this is here is because it's better than setting the
1681          * members directly, which is what Linker::formatComment was doing previously.
1682          *
1683          * @param string $fragment text
1684          * @access kind of public
1685          */
1686         function setFragment( $fragment ) {
1687                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1688         }
1689
1690         /**
1691          * Get a Title object associated with the talk page of this article
1692          * @return Title the object for the talk page
1693          * @access public
1694          */
1695         function getTalkPage() {
1696                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1697         }
1698
1699         /**
1700          * Get a title object associated with the subject page of this
1701          * talk page
1702          *
1703          * @return Title the object for the subject page
1704          * @access public
1705          */
1706         function getSubjectPage() {
1707                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1708         }
1709
1710         /**
1711          * Get an array of Title objects linking to this Title
1712          * Also stores the IDs in the link cache.
1713          *
1714          * WARNING: do not use this function on arbitrary user-supplied titles!
1715          * On heavily-used templates it will max out the memory.
1716          *
1717          * @param string $options may be FOR UPDATE
1718          * @return array the Title objects linking here
1719          * @access public
1720          */
1721         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1722                 $linkCache =& LinkCache::singleton();
1723
1724                 if ( $options ) {
1725                         $db =& wfGetDB( DB_MASTER );
1726                 } else {
1727                         $db =& wfGetDB( DB_SLAVE );
1728                 }
1729
1730                 $res = $db->select( array( 'page', $table ),
1731                         array( 'page_namespace', 'page_title', 'page_id' ),
1732                         array(
1733                                 "{$prefix}_from=page_id",
1734                                 "{$prefix}_namespace" => $this->getNamespace(),
1735                                 "{$prefix}_title"     => $this->getDbKey() ),
1736                         'Title::getLinksTo',
1737                         $options );
1738
1739                 $retVal = array();
1740                 if ( $db->numRows( $res ) ) {
1741                         while ( $row = $db->fetchObject( $res ) ) {
1742                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1743                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1744                                         $retVal[] = $titleObj;
1745                                 }
1746                         }
1747                 }
1748                 $db->freeResult( $res );
1749                 return $retVal;
1750         }
1751
1752         /**
1753          * Get an array of Title objects using this Title as a template
1754          * Also stores the IDs in the link cache.
1755          *
1756          * WARNING: do not use this function on arbitrary user-supplied titles!
1757          * On heavily-used templates it will max out the memory.
1758          *
1759          * @param string $options may be FOR UPDATE
1760          * @return array the Title objects linking here
1761          * @access public
1762          */
1763         function getTemplateLinksTo( $options = '' ) {
1764                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1765         }
1766
1767         /**
1768          * Get an array of Title objects referring to non-existent articles linked from this page
1769          *
1770          * @param string $options may be FOR UPDATE
1771          * @return array the Title objects
1772          * @access public
1773          */
1774         function getBrokenLinksFrom( $options = '' ) {
1775                 if ( $options ) {
1776                         $db =& wfGetDB( DB_MASTER );
1777                 } else {
1778                         $db =& wfGetDB( DB_SLAVE );
1779                 }
1780
1781                 $res = $db->safeQuery(
1782                           "SELECT pl_namespace, pl_title
1783                              FROM !
1784                         LEFT JOIN !
1785                                ON pl_namespace=page_namespace
1786                               AND pl_title=page_title
1787                             WHERE pl_from=?
1788                               AND page_namespace IS NULL
1789                                   !",
1790                         $db->tableName( 'pagelinks' ),
1791                         $db->tableName( 'page' ),
1792                         $this->getArticleId(),
1793                         $options );
1794
1795                 $retVal = array();
1796                 if ( $db->numRows( $res ) ) {
1797                         while ( $row = $db->fetchObject( $res ) ) {
1798                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1799                         }
1800                 }
1801                 $db->freeResult( $res );
1802                 return $retVal;
1803         }
1804
1805
1806         /**
1807          * Get a list of URLs to purge from the Squid cache when this
1808          * page changes
1809          *
1810          * @return array the URLs
1811          * @access public
1812          */
1813         function getSquidURLs() {
1814                 global $wgContLang;
1815
1816                 $urls = array(
1817                         $this->getInternalURL(),
1818                         $this->getInternalURL( 'action=history' )
1819                 );
1820
1821                 // purge variant urls as well
1822                 if($wgContLang->hasVariants()){
1823                         $variants = $wgContLang->getVariants();
1824                         foreach($variants as $vCode){
1825                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
1826                                 $urls[] = $this->getInternalURL('',$vCode);
1827                         }
1828                 }
1829
1830                 return $urls;
1831         }
1832
1833         function purgeSquid() {
1834                 global $wgUseSquid;
1835                 if ( $wgUseSquid ) {
1836                         $urls = $this->getSquidURLs();
1837                         $u = new SquidUpdate( $urls );
1838                         $u->doUpdate();
1839                 }
1840         }
1841
1842         /**
1843          * Move this page without authentication
1844          * @param Title &$nt the new page Title
1845          * @access public
1846          */
1847         function moveNoAuth( &$nt ) {
1848                 return $this->moveTo( $nt, false );
1849         }
1850
1851         /**
1852          * Check whether a given move operation would be valid.
1853          * Returns true if ok, or a message key string for an error message
1854          * if invalid. (Scarrrrry ugly interface this.)
1855          * @param Title &$nt the new title
1856          * @param bool $auth indicates whether $wgUser's permissions
1857          *      should be checked
1858          * @return mixed true on success, message name on failure
1859          * @access public
1860          */
1861         function isValidMoveOperation( &$nt, $auth = true ) {
1862                 if( !$this or !$nt ) {
1863                         return 'badtitletext';
1864                 }
1865                 if( $this->equals( $nt ) ) {
1866                         return 'selfmove';
1867                 }
1868                 if( !$this->isMovable() || !$nt->isMovable() ) {
1869                         return 'immobile_namespace';
1870                 }
1871
1872                 $oldid = $this->getArticleID();
1873                 $newid = $nt->getArticleID();
1874
1875                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1876                         return 'articleexists';
1877                 }
1878                 if ( ( '' == $this->getDBkey() ) ||
1879                          ( !$oldid ) ||
1880                      ( '' == $nt->getDBkey() ) ) {
1881                         return 'badarticleerror';
1882                 }
1883
1884                 if ( $auth && (
1885                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1886                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1887                         return 'protectedpage';
1888                 }
1889
1890                 # The move is allowed only if (1) the target doesn't exist, or
1891                 # (2) the target is a redirect to the source, and has no history
1892                 # (so we can undo bad moves right after they're done).
1893
1894                 if ( 0 != $newid ) { # Target exists; check for validity
1895                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1896                                 return 'articleexists';
1897                         }
1898                 }
1899                 return true;
1900         }
1901
1902         /**
1903          * Move a title to a new location
1904          * @param Title &$nt the new title
1905          * @param bool $auth indicates whether $wgUser's permissions
1906          *      should be checked
1907          * @return mixed true on success, message name on failure
1908          * @access public
1909          */
1910         function moveTo( &$nt, $auth = true, $reason = '' ) {
1911                 $err = $this->isValidMoveOperation( $nt, $auth );
1912                 if( is_string( $err ) ) {
1913                         return $err;
1914                 }
1915
1916                 $pageid = $this->getArticleID();
1917                 if( $nt->exists() ) {
1918                         $this->moveOverExistingRedirect( $nt, $reason );
1919                         $pageCountChange = 0;
1920                 } else { # Target didn't exist, do normal move.
1921                         $this->moveToNewTitle( $nt, $reason );
1922                         $pageCountChange = 1;
1923                 }
1924                 $redirid = $this->getArticleID();
1925
1926                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1927                 $dbw =& wfGetDB( DB_MASTER );
1928                 $categorylinks = $dbw->tableName( 'categorylinks' );
1929                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1930                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1931                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1932                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1933
1934                 # Update watchlists
1935
1936                 $oldnamespace = $this->getNamespace() & ~1;
1937                 $newnamespace = $nt->getNamespace() & ~1;
1938                 $oldtitle = $this->getDBkey();
1939                 $newtitle = $nt->getDBkey();
1940
1941                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1942                         WatchedItem::duplicateEntries( $this, $nt );
1943                 }
1944
1945                 # Update search engine
1946                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1947                 $u->doUpdate();
1948                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1949                 $u->doUpdate();
1950
1951                 # Update site_stats
1952                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1953                         # Moved out of main namespace
1954                         # not viewed, edited, removing
1955                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1956                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1957                         # Moved into main namespace
1958                         # not viewed, edited, adding
1959                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1960                 } elseif ( $pageCountChange ) {
1961                         # Added redirect
1962                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1963                 } else{
1964                         $u = false;
1965                 }
1966                 if ( $u ) {
1967                         $u->doUpdate();
1968                 }
1969
1970                 global $wgUser;
1971                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1972                 return true;
1973         }
1974
1975         /**
1976          * Move page to a title which is at present a redirect to the
1977          * source page
1978          *
1979          * @param Title &$nt the page to move to, which should currently
1980          *      be a redirect
1981          * @private
1982          */
1983         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1984                 global $wgUseSquid;
1985                 $fname = 'Title::moveOverExistingRedirect';
1986                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1987
1988                 if ( $reason ) {
1989                         $comment .= ": $reason";
1990                 }
1991
1992                 $now = wfTimestampNow();
1993                 $newid = $nt->getArticleID();
1994                 $oldid = $this->getArticleID();
1995                 $dbw =& wfGetDB( DB_MASTER );
1996                 $linkCache =& LinkCache::singleton();
1997
1998                 # Delete the old redirect. We don't save it to history since
1999                 # by definition if we've got here it's rather uninteresting.
2000                 # We have to remove it so that the next step doesn't trigger
2001                 # a conflict on the unique namespace+title index...
2002                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2003
2004                 # Save a null revision in the page's history notifying of the move
2005                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2006                 $nullRevId = $nullRevision->insertOn( $dbw );
2007
2008                 # Change the name of the target page:
2009                 $dbw->update( 'page',
2010                         /* SET */ array(
2011                                 'page_touched'   => $dbw->timestamp($now),
2012                                 'page_namespace' => $nt->getNamespace(),
2013                                 'page_title'     => $nt->getDBkey(),
2014                                 'page_latest'    => $nullRevId,
2015                         ),
2016                         /* WHERE */ array( 'page_id' => $oldid ),
2017                         $fname
2018                 );
2019                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2020
2021                 # Recreate the redirect, this time in the other direction.
2022                 $mwRedir = MagicWord::get( 'redirect' );
2023                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2024                 $redirectArticle = new Article( $this );
2025                 $newid = $redirectArticle->insertOn( $dbw );
2026                 $redirectRevision = new Revision( array(
2027                         'page'    => $newid,
2028                         'comment' => $comment,
2029                         'text'    => $redirectText ) );
2030                 $redirectRevision->insertOn( $dbw );
2031                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2032                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2033
2034                 # Log the move
2035                 $log = new LogPage( 'move' );
2036                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2037
2038                 # Now, we record the link from the redirect to the new title.
2039                 # It should have no other outgoing links...
2040                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2041                 $dbw->insert( 'pagelinks',
2042                         array(
2043                                 'pl_from'      => $newid,
2044                                 'pl_namespace' => $nt->getNamespace(),
2045                                 'pl_title'     => $nt->getDbKey() ),
2046                         $fname );
2047
2048                 # Purge squid
2049                 if ( $wgUseSquid ) {
2050                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2051                         $u = new SquidUpdate( $urls );
2052                         $u->doUpdate();
2053                 }
2054         }
2055
2056         /**
2057          * Move page to non-existing title.
2058          * @param Title &$nt the new Title
2059          * @private
2060          */
2061         function moveToNewTitle( &$nt, $reason = '' ) {
2062                 global $wgUseSquid;
2063                 $fname = 'MovePageForm::moveToNewTitle';
2064                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2065                 if ( $reason ) {
2066                         $comment .= ": $reason";
2067                 }
2068
2069                 $newid = $nt->getArticleID();
2070                 $oldid = $this->getArticleID();
2071                 $dbw =& wfGetDB( DB_MASTER );
2072                 $now = $dbw->timestamp();
2073                 $linkCache =& LinkCache::singleton();
2074
2075                 # Save a null revision in the page's history notifying of the move
2076                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2077                 $nullRevId = $nullRevision->insertOn( $dbw );
2078
2079                 # Rename cur entry
2080                 $dbw->update( 'page',
2081                         /* SET */ array(
2082                                 'page_touched'   => $now,
2083                                 'page_namespace' => $nt->getNamespace(),
2084                                 'page_title'     => $nt->getDBkey(),
2085                                 'page_latest'    => $nullRevId,
2086                         ),
2087                         /* WHERE */ array( 'page_id' => $oldid ),
2088                         $fname
2089                 );
2090
2091                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2092
2093                 # Insert redirect
2094                 $mwRedir = MagicWord::get( 'redirect' );
2095                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2096                 $redirectArticle = new Article( $this );
2097                 $newid = $redirectArticle->insertOn( $dbw );
2098                 $redirectRevision = new Revision( array(
2099                         'page'    => $newid,
2100                         'comment' => $comment,
2101                         'text'    => $redirectText ) );
2102                 $redirectRevision->insertOn( $dbw );
2103                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2104                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2105
2106                 # Log the move
2107                 $log = new LogPage( 'move' );
2108                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2109
2110                 # Purge caches as per article creation
2111                 Article::onArticleCreate( $nt );
2112
2113                 # Record the just-created redirect's linking to the page
2114                 $dbw->insert( 'pagelinks',
2115                         array(
2116                                 'pl_from'      => $newid,
2117                                 'pl_namespace' => $nt->getNamespace(),
2118                                 'pl_title'     => $nt->getDBkey() ),
2119                         $fname );
2120
2121                 # Purge old title from squid
2122                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2123                 $this->purgeSquid();
2124         }
2125
2126         /**
2127          * Checks if $this can be moved to a given Title
2128          * - Selects for update, so don't call it unless you mean business
2129          *
2130          * @param Title &$nt the new title to check
2131          * @access public
2132          */
2133         function isValidMoveTarget( $nt ) {
2134
2135                 $fname = 'Title::isValidMoveTarget';
2136                 $dbw =& wfGetDB( DB_MASTER );
2137
2138                 # Is it a redirect?
2139                 $id  = $nt->getArticleID();
2140                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2141                         array( 'page_is_redirect','old_text','old_flags' ),
2142                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2143                         $fname, 'FOR UPDATE' );
2144
2145                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2146                         # Not a redirect
2147                         wfDebug( __METHOD__ . ": not a redirect\n" );
2148                         return false;
2149                 }
2150                 $text = Revision::getRevisionText( $obj );
2151
2152                 # Does the redirect point to the source?
2153                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2154                 $m = array();
2155                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2156                         $redirTitle = Title::newFromText( $m[1] );
2157                         if( !is_object( $redirTitle ) ||
2158                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2159                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2160                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2161                                 return false;
2162                         }
2163                 } else {
2164                         # Fail safe
2165                         wfDebug( __METHOD__ . ": failsafe\n" );
2166                         return false;
2167                 }
2168
2169                 # Does the article have a history?
2170                 $row = $dbw->selectRow( array( 'page', 'revision'),
2171                         array( 'rev_id' ),
2172                         array( 'page_namespace' => $nt->getNamespace(),
2173                                 'page_title' => $nt->getDBkey(),
2174                                 'page_id=rev_page AND page_latest != rev_id'
2175                         ), $fname, 'FOR UPDATE'
2176                 );
2177
2178                 # Return true if there was no history
2179                 return $row === false;
2180         }
2181
2182         /**
2183          * Create a redirect; fails if the title already exists; does
2184          * not notify RC
2185          *
2186          * @param Title $dest the destination of the redirect
2187          * @param string $comment the comment string describing the move
2188          * @return bool true on success
2189          * @access public
2190          */
2191         function createRedirect( $dest, $comment ) {
2192                 if ( $this->getArticleID() ) {
2193                         return false;
2194                 }
2195
2196                 $fname = 'Title::createRedirect';
2197                 $dbw =& wfGetDB( DB_MASTER );
2198
2199                 $article = new Article( $this );
2200                 $newid = $article->insertOn( $dbw );
2201                 $revision = new Revision( array(
2202                         'page'      => $newid,
2203                         'comment'   => $comment,
2204                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2205                         ) );
2206                 $revision->insertOn( $dbw );
2207                 $article->updateRevisionOn( $dbw, $revision, 0 );
2208
2209                 # Link table
2210                 $dbw->insert( 'pagelinks',
2211                         array(
2212                                 'pl_from'      => $newid,
2213                                 'pl_namespace' => $dest->getNamespace(),
2214                                 'pl_title'     => $dest->getDbKey()
2215                         ), $fname
2216                 );
2217
2218                 Article::onArticleCreate( $this );
2219                 return true;
2220         }
2221
2222         /**
2223          * Get categories to which this Title belongs and return an array of
2224          * categories' names.
2225          *
2226          * @return array an array of parents in the form:
2227          *      $parent => $currentarticle
2228          * @access public
2229          */
2230         function getParentCategories() {
2231                 global $wgContLang;
2232
2233                 $titlekey = $this->getArticleId();
2234                 $dbr =& wfGetDB( DB_SLAVE );
2235                 $categorylinks = $dbr->tableName( 'categorylinks' );
2236
2237                 # NEW SQL
2238                 $sql = "SELECT * FROM $categorylinks"
2239                      ." WHERE cl_from='$titlekey'"
2240                          ." AND cl_from <> '0'"
2241                          ." ORDER BY cl_sortkey";
2242
2243                 $res = $dbr->query ( $sql ) ;
2244
2245                 if($dbr->numRows($res) > 0) {
2246                         while ( $x = $dbr->fetchObject ( $res ) )
2247                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2248                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2249                         $dbr->freeResult ( $res ) ;
2250                 } else {
2251                         $data = '';
2252                 }
2253                 return $data;
2254         }
2255
2256         /**
2257          * Get a tree of parent categories
2258          * @param array $children an array with the children in the keys, to check for circular refs
2259          * @return array
2260          * @access public
2261          */
2262         function getParentCategoryTree( $children = array() ) {
2263                 $parents = $this->getParentCategories();
2264
2265                 if($parents != '') {
2266                         foreach($parents as $parent => $current) {
2267                                 if ( array_key_exists( $parent, $children ) ) {
2268                                         # Circular reference
2269                                         $stack[$parent] = array();
2270                                 } else {
2271                                         $nt = Title::newFromText($parent);
2272                                         if ( $nt ) {
2273                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2274                                         }
2275                                 }
2276                         }
2277                         return $stack;
2278                 } else {
2279                         return array();
2280                 }
2281         }
2282
2283
2284         /**
2285          * Get an associative array for selecting this title from
2286          * the "page" table
2287          *
2288          * @return array
2289          * @access public
2290          */
2291         function pageCond() {
2292                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2293         }
2294
2295         /**
2296          * Get the revision ID of the previous revision
2297          *
2298          * @param integer $revision  Revision ID. Get the revision that was before this one.
2299          * @return integer $oldrevision|false
2300          */
2301         function getPreviousRevisionID( $revision ) {
2302                 $dbr =& wfGetDB( DB_SLAVE );
2303                 return $dbr->selectField( 'revision', 'rev_id',
2304                         'rev_page=' . intval( $this->getArticleId() ) .
2305                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2306         }
2307
2308         /**
2309          * Get the revision ID of the next revision
2310          *
2311          * @param integer $revision  Revision ID. Get the revision that was after this one.
2312          * @return integer $oldrevision|false
2313          */
2314         function getNextRevisionID( $revision ) {
2315                 $dbr =& wfGetDB( DB_SLAVE );
2316                 return $dbr->selectField( 'revision', 'rev_id',
2317                         'rev_page=' . intval( $this->getArticleId() ) .
2318                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2319         }
2320
2321         /**
2322          * Get the number of revisions between the given revision IDs.
2323          *
2324          * @param integer $old  Revision ID.
2325          * @param integer $new  Revision ID.
2326          * @return integer  Number of revisions between these IDs.
2327          */
2328         function countRevisionsBetween( $old, $new ) {
2329                 $dbr =& wfGetDB( DB_SLAVE );
2330                 return $dbr->selectField( 'revision', 'count(*)',
2331                         'rev_page = ' . intval( $this->getArticleId() ) .
2332                         ' AND rev_id > ' . intval( $old ) .
2333                         ' AND rev_id < ' . intval( $new ) );
2334         }
2335
2336         /**
2337          * Compare with another title.
2338          *
2339          * @param Title $title
2340          * @return bool
2341          */
2342         function equals( $title ) {
2343                 // Note: === is necessary for proper matching of number-like titles.
2344                 return $this->getInterwiki() === $title->getInterwiki()
2345                         && $this->getNamespace() == $title->getNamespace()
2346                         && $this->getDbkey() === $title->getDbkey();
2347         }
2348
2349         /**
2350          * Check if page exists
2351          * @return bool
2352          */
2353         function exists() {
2354                 return $this->getArticleId() != 0;
2355         }
2356
2357         /**
2358          * Should a link should be displayed as a known link, just based on its title?
2359          *
2360          * Currently, a self-link with a fragment and special pages are in
2361          * this category. Special pages never exist in the database.
2362          */
2363         function isAlwaysKnown() {
2364                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2365                   || NS_SPECIAL == $this->mNamespace;
2366         }
2367
2368         /**
2369          * Update page_touched timestamps and send squid purge messages for
2370          * pages linking to this title. May be sent to the job queue depending
2371          * on the number of links. Typically called on create and delete.
2372          */
2373         function touchLinks() {
2374                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2375                 $u->doUpdate();
2376
2377                 if ( $this->getNamespace() == NS_CATEGORY ) {
2378                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2379                         $u->doUpdate();
2380                 }
2381         }
2382
2383         /**
2384          * Get the last touched timestamp
2385          */
2386         function getTouched() {
2387                 $dbr =& wfGetDB( DB_SLAVE );
2388                 $touched = $dbr->selectField( 'page', 'page_touched',
2389                         array(
2390                                 'page_namespace' => $this->getNamespace(),
2391                                 'page_title' => $this->getDBkey()
2392                         ), __METHOD__
2393                 );
2394                 return $touched;
2395         }
2396
2397         /**
2398          * Get a cached value from a global cache that is invalidated when this page changes
2399          * @param string $key the key
2400          * @param callback $callback A callback function which generates the value on cache miss
2401          *
2402          * @deprecated use DependencyWrapper
2403          */
2404         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2405                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2406                         $params, new TitleDependency( $this ) );
2407         }
2408
2409         function trackbackURL() {
2410                 global $wgTitle, $wgScriptPath, $wgServer;
2411
2412                 return "$wgServer$wgScriptPath/trackback.php?article="
2413                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2414         }
2415
2416         function trackbackRDF() {
2417                 $url = htmlspecialchars($this->getFullURL());
2418                 $title = htmlspecialchars($this->getText());
2419                 $tburl = $this->trackbackURL();
2420
2421                 return "
2422 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2423          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2424          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2425 <rdf:Description
2426    rdf:about=\"$url\"
2427    dc:identifier=\"$url\"
2428    dc:title=\"$title\"
2429    trackback:ping=\"$tburl\" />
2430 </rdf:RDF>";
2431         }
2432
2433         /**
2434          * Generate strings used for xml 'id' names in monobook tabs
2435          * @return string
2436          */
2437         function getNamespaceKey() {
2438                 global $wgContLang;
2439                 switch ($this->getNamespace()) {
2440                         case NS_MAIN:
2441                         case NS_TALK:
2442                                 return 'nstab-main';
2443                         case NS_USER:
2444                         case NS_USER_TALK:
2445                                 return 'nstab-user';
2446                         case NS_MEDIA:
2447                                 return 'nstab-media';
2448                         case NS_SPECIAL:
2449                                 return 'nstab-special';
2450                         case NS_PROJECT:
2451                         case NS_PROJECT_TALK:
2452                                 return 'nstab-project';
2453                         case NS_IMAGE:
2454                         case NS_IMAGE_TALK:
2455                                 return 'nstab-image';
2456                         case NS_MEDIAWIKI:
2457                         case NS_MEDIAWIKI_TALK:
2458                                 return 'nstab-mediawiki';
2459                         case NS_TEMPLATE:
2460                         case NS_TEMPLATE_TALK:
2461                                 return 'nstab-template';
2462                         case NS_HELP:
2463                         case NS_HELP_TALK:
2464                                 return 'nstab-help';
2465                         case NS_CATEGORY:
2466                         case NS_CATEGORY_TALK:
2467                                 return 'nstab-category';
2468                         default:
2469                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2470                 }
2471         }
2472
2473         /**
2474          * Returns true if this title resolves to the named special page
2475          * @param string $name The special page name
2476          * @access public
2477          */
2478         function isSpecial( $name ) {
2479                 if ( $this->getNamespace() == NS_SPECIAL ) {
2480                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2481                         if ( $name == $thisName ) {
2482                                 return true;
2483                         }
2484                 }
2485                 return false;
2486         }
2487
2488         /**
2489          * If the Title refers to a special page alias which is not the local default,
2490          * returns a new Title which points to the local default. Otherwise, returns $this.
2491          */
2492         function fixSpecialName() {
2493                 if ( $this->getNamespace() == NS_SPECIAL ) {
2494                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2495                         if ( $canonicalName ) {
2496                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2497                                 if ( $localName != $this->mDbkeyform ) {
2498                                         return Title::makeTitle( NS_SPECIAL, $localName );
2499                                 }
2500                         }
2501                 }
2502                 return $this;
2503         }
2504 }
2505 ?>