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         public static 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          */
 284         public static function newFromRedirect( $text ) {
 285                 $mwRedir = MagicWord::get( 'redirect' );
 286                 $rt = NULL;
 287                 if ( $mwRedir->matchStart( $text ) ) {
 288                         $m = array();
 289                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 290                                 # categories are escaped using : for example one can enter:
 291                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 292                                 if ( substr($m[1],0,1) == ':') {
 293                                         # We don't want to keep the ':'
 294                                         $m[1] = substr( $m[1], 1 );
 295                                 }
 296
 297                                 $rt = Title::newFromText( $m[1] );
 298                                 # Disallow redirects to Special:Userlogout
 299                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 300                                         $rt = NULL;
 301                                 }
 302                         }
 303                 }
 304                 return $rt;
 305         }
 306
 307 #----------------------------------------------------------------------------
 308 #       Static functions
 309 #----------------------------------------------------------------------------
 310
 311         /**
 312          * Get the prefixed DB key associated with an ID
 313          * @param int $id the page_id of the article
 314          * @return Title an object representing the article, or NULL
 315          *      if no such article was found
 316          * @static
 317          * @access public
 318          */
 319         function nameOf( $id ) {
 320                 $fname = 'Title::nameOf';
 321                 $dbr =& wfGetDB( DB_SLAVE );
 322
 323                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 324                 if ( $s === false ) { return NULL; }
 325
 326                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 327                 return $n;
 328         }
 329
 330         /**
 331          * Get a regex character class describing the legal characters in a link
 332          * @return string the list of characters, not delimited
 333          * @static
 334          * @access public
 335          */
 336         public static function legalChars() {
 337                 global $wgLegalTitleChars;
 338                 return $wgLegalTitleChars;
 339         }
 340
 341         /**
 342          * Get a string representation of a title suitable for
 343          * including in a search index
 344          *
 345          * @param int $ns a namespace index
 346          * @param string $title text-form main part
 347          * @return string a stripped-down title string ready for the
 348          *      search index
 349          */
 350         public static function indexTitle( $ns, $title ) {
 351                 global $wgContLang;
 352
 353                 $lc = SearchEngine::legalSearchChars() . '&#;';
 354                 $t = $wgContLang->stripForSearch( $title );
 355                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 356                 $t = $wgContLang->lc( $t );
 357
 358                 # Handle 's, s'
 359                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 360                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 361
 362                 $t = preg_replace( "/\\s+/", ' ', $t );
 363
 364                 if ( $ns == NS_IMAGE ) {
 365                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 366                 }
 367                 return trim( $t );
 368         }
 369
 370         /*
 371          * Make a prefixed DB key from a DB key and a namespace index
 372          * @param int $ns numerical representation of the namespace
 373          * @param string $title the DB key form the title
 374          * @return string the prefixed form of the title
 375          */
 376         public static function makeName( $ns, $title ) {
 377                 global $wgContLang;
 378
 379                 $n = $wgContLang->getNsText( $ns );
 380                 return $n == '' ? $title : "$n:$title";
 381         }
 382
 383         /**
 384          * Returns the URL associated with an interwiki prefix
 385          * @param string $key the interwiki prefix (e.g. "MeatBall")
 386          * @return the associated URL, containing "$1", which should be
 387          *      replaced by an article title
 388          * @static (arguably)
 389          * @access public
 390          */
 391         function getInterwikiLink( $key )  {
 392                 global $wgMemc, $wgInterwikiExpiry;
 393                 global $wgInterwikiCache, $wgContLang;
 394                 $fname = 'Title::getInterwikiLink';
 395
 396                 $key = $wgContLang->lc( $key );
 397
 398                 $k = wfMemcKey( 'interwiki', $key );
 399                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 400                         return Title::$interwikiCache[$k]->iw_url;
 401                 }
 402
 403                 if ($wgInterwikiCache) {
 404                         return Title::getInterwikiCached( $key );
 405                 }
 406
 407                 $s = $wgMemc->get( $k );
 408                 # Ignore old keys with no iw_local
 409                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 410                         Title::$interwikiCache[$k] = $s;
 411                         return $s->iw_url;
 412                 }
 413
 414                 $dbr =& wfGetDB( DB_SLAVE );
 415                 $res = $dbr->select( 'interwiki',
 416                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 417                         array( 'iw_prefix' => $key ), $fname );
 418                 if( !$res ) {
 419                         return '';
 420                 }
 421
 422                 $s = $dbr->fetchObject( $res );
 423                 if( !$s ) {
 424                         # Cache non-existence: create a blank object and save it to memcached
 425                         $s = (object)false;
 426                         $s->iw_url = '';
 427                         $s->iw_local = 0;
 428                         $s->iw_trans = 0;
 429                 }
 430                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 431                 Title::$interwikiCache[$k] = $s;
 432
 433                 return $s->iw_url;
 434         }
 435
 436         /**
 437          * Fetch interwiki prefix data from local cache in constant database
 438          *
 439          * More logic is explained in DefaultSettings
 440          *
 441          * @return string URL of interwiki site
 442          * @access public
 443          */
 444         function getInterwikiCached( $key ) {
 445                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 446                 static $db, $site;
 447
 448                 if (!$db)
 449                         $db=dba_open($wgInterwikiCache,'r','cdb');
 450                 /* Resolve site name */
 451                 if ($wgInterwikiScopes>=3 and !$site) {
 452                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 453                         if ($site=="")
 454                                 $site = $wgInterwikiFallbackSite;
 455                 }
 456                 $value = dba_fetch( wfMemcKey( $key ), $db);
 457                 if ($value=='' and $wgInterwikiScopes>=3) {
 458                         /* try site-level */
 459                         $value = dba_fetch("_{$site}:{$key}", $db);
 460                 }
 461                 if ($value=='' and $wgInterwikiScopes>=2) {
 462                         /* try globals */
 463                         $value = dba_fetch("__global:{$key}", $db);
 464                 }
 465                 if ($value=='undef')
 466                         $value='';
 467                 $s = (object)false;
 468                 $s->iw_url = '';
 469                 $s->iw_local = 0;
 470                 $s->iw_trans = 0;
 471                 if ($value!='') {
 472                         list($local,$url)=explode(' ',$value,2);
 473                         $s->iw_url=$url;
 474                         $s->iw_local=(int)$local;
 475                 }
 476                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 477                 return $s->iw_url;
 478         }
 479         /**
 480          * Determine whether the object refers to a page within
 481          * this project.
 482          *
 483          * @return bool TRUE if this is an in-project interwiki link
 484          *      or a wikilink, FALSE otherwise
 485          * @access public
 486          */
 487         function isLocal() {
 488                 if ( $this->mInterwiki != '' ) {
 489                         # Make sure key is loaded into cache
 490                         $this->getInterwikiLink( $this->mInterwiki );
 491                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 492                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 493                 } else {
 494                         return true;
 495                 }
 496         }
 497
 498         /**
 499          * Determine whether the object refers to a page within
 500          * this project and is transcludable.
 501          *
 502          * @return bool TRUE if this is transcludable
 503          * @access public
 504          */
 505         function isTrans() {
 506                 if ($this->mInterwiki == '')
 507                         return false;
 508                 # Make sure key is loaded into cache
 509                 $this->getInterwikiLink( $this->mInterwiki );
 510                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 511                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 512         }
 513
 514         /**
 515          * Update the page_touched field for an array of title objects
 516          * @todo Inefficient unless the IDs are already loaded into the
 517          *      link cache
 518          * @param array $titles an array of Title objects to be touched
 519          * @param string $timestamp the timestamp to use instead of the
 520          *      default current time
 521          * @static
 522          * @access public
 523          */
 524         function touchArray( $titles, $timestamp = '' ) {
 525
 526                 if ( count( $titles ) == 0 ) {
 527                         return;
 528                 }
 529                 $dbw =& wfGetDB( DB_MASTER );
 530                 if ( $timestamp == '' ) {
 531                         $timestamp = $dbw->timestamp();
 532                 }
 533                 /*
 534                 $page = $dbw->tableName( 'page' );
 535                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 536                 $first = true;
 537
 538                 foreach ( $titles as $title ) {
 539                         if ( $wgUseFileCache ) {
 540                                 $cm = new HTMLFileCache($title);
 541                                 @unlink($cm->fileCacheName());
 542                         }
 543
 544                         if ( ! $first ) {
 545                                 $sql .= ',';
 546                         }
 547                         $first = false;
 548                         $sql .= $title->getArticleID();
 549                 }
 550                 $sql .= ')';
 551                 if ( ! $first ) {
 552                         $dbw->query( $sql, 'Title::touchArray' );
 553                 }
 554                 */
 555                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 556                 // do them in small chunks:
 557                 $fname = 'Title::touchArray';
 558                 foreach( $titles as $title ) {
 559                         $dbw->update( 'page',
 560                                 array( 'page_touched' => $timestamp ),
 561                                 array(
 562                                         'page_namespace' => $title->getNamespace(),
 563                                         'page_title'     => $title->getDBkey() ),
 564                                 $fname );
 565                 }
 566         }
 567
 568         /**
 569          * Escape a text fragment, say from a link, for a URL
 570          */
 571         static function escapeFragmentForURL( $fragment ) {
 572                 $fragment = str_replace( ' ', '_', $fragment );
 573                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 574                 $replaceArray = array(
 575                         '%3A' => ':',
 576                         '%' => '.'
 577                 );
 578                 return strtr( $fragment, $replaceArray );
 579         }
 580
 581 #----------------------------------------------------------------------------
 582 #       Other stuff
 583 #----------------------------------------------------------------------------
 584
 585         /** Simple accessors */
 586         /**
 587          * Get the text form (spaces not underscores) of the main part
 588          * @return string
 589          * @access public
 590          */
 591         function getText() { return $this->mTextform; }
 592         /**
 593          * Get the URL-encoded form of the main part
 594          * @return string
 595          * @access public
 596          */
 597         function getPartialURL() { return $this->mUrlform; }
 598         /**
 599          * Get the main part with underscores
 600          * @return string
 601          * @access public
 602          */
 603         function getDBkey() { return $this->mDbkeyform; }
 604         /**
 605          * Get the namespace index, i.e. one of the NS_xxxx constants
 606          * @return int
 607          * @access public
 608          */
 609         function getNamespace() { return $this->mNamespace; }
 610         /**
 611          * Get the namespace text
 612          * @return string
 613          * @access public
 614          */
 615         function getNsText() {
 616                 global $wgContLang, $wgCanonicalNamespaceNames;
 617
 618                 if ( '' != $this->mInterwiki ) {
 619                         // This probably shouldn't even happen. ohh man, oh yuck.
 620                         // But for interwiki transclusion it sometimes does.
 621                         // Shit. Shit shit shit.
 622                         //
 623                         // Use the canonical namespaces if possible to try to
 624                         // resolve a foreign namespace.
 625                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 626                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 627                         }
 628                 }
 629                 return $wgContLang->getNsText( $this->mNamespace );
 630         }
 631         /**
 632          * Get the namespace text of the subject (rather than talk) page
 633          * @return string
 634          * @access public
 635          */
 636         function getSubjectNsText() {
 637                 global $wgContLang;
 638                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 639         }
 640
 641         /**
 642          * Get the namespace text of the talk page
 643          * @return string
 644          */
 645         function getTalkNsText() {
 646                 global $wgContLang;
 647                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 648         }
 649
 650         /**
 651          * Could this title have a corresponding talk page?
 652          * @return bool
 653          */
 654         function canTalk() {
 655                 return( Namespace::canTalk( $this->mNamespace ) );
 656         }
 657
 658         /**
 659          * Get the interwiki prefix (or null string)
 660          * @return string
 661          * @access public
 662          */
 663         function getInterwiki() { return $this->mInterwiki; }
 664         /**
 665          * Get the Title fragment (i.e. the bit after the #) in text form
 666          * @return string
 667          * @access public
 668          */
 669         function getFragment() { return $this->mFragment; }
 670         /**
 671          * Get the fragment in URL form, including the "#" character if there is one
 672          *
 673          * @return string
 674          * @access public
 675          */
 676         function getFragmentForURL() {
 677                 if ( $this->mFragment == '' ) {
 678                         return '';
 679                 } else {
 680                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 681                 }
 682         }
 683         /**
 684          * Get the default namespace index, for when there is no namespace
 685          * @return int
 686          * @access public
 687          */
 688         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 689
 690         /**
 691          * Get title for search index
 692          * @return string a stripped-down title string ready for the
 693          *      search index
 694          */
 695         function getIndexTitle() {
 696                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 697         }
 698
 699         /**
 700          * Get the prefixed database key form
 701          * @return string the prefixed title, with underscores and
 702          *      any interwiki and namespace prefixes
 703          * @access public
 704          */
 705         function getPrefixedDBkey() {
 706                 $s = $this->prefix( $this->mDbkeyform );
 707                 $s = str_replace( ' ', '_', $s );
 708                 return $s;
 709         }
 710
 711         /**
 712          * Get the prefixed title with spaces.
 713          * This is the form usually used for display
 714          * @return string the prefixed title, with spaces
 715          * @access public
 716          */
 717         function getPrefixedText() {
 718                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 719                         $s = $this->prefix( $this->mTextform );
 720                         $s = str_replace( '_', ' ', $s );
 721                         $this->mPrefixedText = $s;
 722                 }
 723                 return $this->mPrefixedText;
 724         }
 725
 726         /**
 727          * Get the prefixed title with spaces, plus any fragment
 728          * (part beginning with '#')
 729          * @return string the prefixed title, with spaces and
 730          *      the fragment, including '#'
 731          * @access public
 732          */
 733         function getFullText() {
 734                 $text = $this->getPrefixedText();
 735                 if( '' != $this->mFragment ) {
 736                         $text .= '#' . $this->mFragment;
 737                 }
 738                 return $text;
 739         }
 740
 741         /**
 742          * Get the base name, i.e. the leftmost parts before the /
 743          * @return string Base name
 744          */
 745         function getBaseText() {
 746                 global $wgNamespacesWithSubpages;
 747                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 748                         $parts = explode( '/', $this->getText() );
 749                         # Don't discard the real title if there's no subpage involved
 750                         if( count( $parts ) > 1 )
 751                                 unset( $parts[ count( $parts ) - 1 ] );
 752                         return implode( '/', $parts );
 753                 } else {
 754                         return $this->getText();
 755                 }
 756         }
 757
 758         /**
 759          * Get the lowest-level subpage name, i.e. the rightmost part after /
 760          * @return string Subpage name
 761          */
 762         function getSubpageText() {
 763                 global $wgNamespacesWithSubpages;
 764                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 765                         $parts = explode( '/', $this->mTextform );
 766                         return( $parts[ count( $parts ) - 1 ] );
 767                 } else {
 768                         return( $this->mTextform );
 769                 }
 770         }
 771
 772         /**
 773          * Get a URL-encoded form of the subpage text
 774          * @return string URL-encoded subpage name
 775          */
 776         function getSubpageUrlForm() {
 777                 $text = $this->getSubpageText();
 778                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 779                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 780                 return( $text );
 781         }
 782
 783         /**
 784          * Get a URL-encoded title (not an actual URL) including interwiki
 785          * @return string the URL-encoded form
 786          * @access public
 787          */
 788         function getPrefixedURL() {
 789                 $s = $this->prefix( $this->mDbkeyform );
 790                 $s = str_replace( ' ', '_', $s );
 791
 792                 $s = wfUrlencode ( $s ) ;
 793
 794                 # Cleaning up URL to make it look nice -- is this safe?
 795                 $s = str_replace( '%28', '(', $s );
 796                 $s = str_replace( '%29', ')', $s );
 797
 798                 return $s;
 799         }
 800
 801         /**
 802          * Get a real URL referring to this title, with interwiki link and
 803          * fragment
 804          *
 805          * @param string $query an optional query string, not used
 806          *      for interwiki links
 807          * @param string $variant language variant of url (for sr, zh..)
 808          * @return string the URL
 809          * @access public
 810          */
 811         function getFullURL( $query = '', $variant = false ) {
 812                 global $wgContLang, $wgServer, $wgRequest;
 813
 814                 if ( '' == $this->mInterwiki ) {
 815                         $url = $this->getLocalUrl( $query, $variant );
 816
 817                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 818                         // Correct fix would be to move the prepending elsewhere.
 819                         if ($wgRequest->getVal('action') != 'render') {
 820                                 $url = $wgServer . $url;
 821                         }
 822                 } else {
 823                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 824
 825                         $namespace = wfUrlencode( $this->getNsText() );
 826                         if ( '' != $namespace ) {
 827                                 # Can this actually happen? Interwikis shouldn't be parsed.
 828                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 829                                 $namespace .= ':';
 830                         }
 831                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 832                         if( $query != '' ) {
 833                                 if( false === strpos( $url, '?' ) ) {
 834                                         $url .= '?';
 835                                 } else {
 836                                         $url .= '&';
 837                                 }
 838                                 $url .= $query;
 839                         }
 840                 }
 841
 842                 # Finally, add the fragment.
 843                 $url .= $this->getFragmentForURL();
 844
 845                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 846                 return $url;
 847         }
 848
 849         /**
 850          * Get a URL with no fragment or server name.  If this page is generated
 851          * with action=render, $wgServer is prepended.
 852          * @param string $query an optional query string; if not specified,
 853          *      $wgArticlePath will be used.
 854          * @param string $variant language variant of url (for sr, zh..)
 855          * @return string the URL
 856          * @access public
 857          */
 858         function getLocalURL( $query = '', $variant = false ) {
 859                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 860                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 861
 862                 // internal links should point to same variant as current page (only anonymous users)
 863                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 864                         $pref = $wgContLang->getPreferredVariant(false);
 865                         if($pref != $wgContLang->getCode())
 866                                 $variant = $pref;
 867                 }
 868
 869                 if ( $this->isExternal() ) {
 870                         $url = $this->getFullURL();
 871                         if ( $query ) {
 872                                 // This is currently only used for edit section links in the
 873                                 // context of interwiki transclusion. In theory we should
 874                                 // append the query to the end of any existing query string,
 875                                 // but interwiki transclusion is already broken in that case.
 876                                 $url .= "?$query";
 877                         }
 878                 } else {
 879                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 880                         if ( $query == '' ) {
 881                                 if($variant!=false && $wgContLang->hasVariants()){
 882                                         if($wgVariantArticlePath==false)
 883                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 884                                         else
 885                                                 $variantArticlePath = $wgVariantArticlePath;
 886
 887                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 888                                         $url = str_replace( '$1', $dbkey, $url  );
 889
 890                                 }
 891                                 else
 892                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 893                         } else {
 894                                 global $wgActionPaths;
 895                                 $url = false;
 896                                 $matches = array();
 897                                 if( !empty( $wgActionPaths ) &&
 898                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 899                                 {
 900                                         $action = urldecode( $matches[2] );
 901                                         if( isset( $wgActionPaths[$action] ) ) {
 902                                                 $query = $matches[1];
 903                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 904                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 905                                                 if( $query != '' ) $url .= '?' . $query;
 906                                         }
 907                                 }
 908                                 if ( $url === false ) {
 909                                         if ( $query == '-' ) {
 910                                                 $query = '';
 911                                         }
 912                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 913                                 }
 914                         }
 915
 916                         // FIXME: this causes breakage in various places when we
 917                         // actually expected a local URL and end up with dupe prefixes.
 918                         if ($wgRequest->getVal('action') == 'render') {
 919                                 $url = $wgServer . $url;
 920                         }
 921                 }
 922                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 923                 return $url;
 924         }
 925
 926         /**
 927          * Get an HTML-escaped version of the URL form, suitable for
 928          * using in a link, without a server name or fragment
 929          * @param string $query an optional query string
 930          * @return string the URL
 931          * @access public
 932          */
 933         function escapeLocalURL( $query = '' ) {
 934                 return htmlspecialchars( $this->getLocalURL( $query ) );
 935         }
 936
 937         /**
 938          * Get an HTML-escaped version of the URL form, suitable for
 939          * using in a link, including the server name and fragment
 940          *
 941          * @return string the URL
 942          * @param string $query an optional query string
 943          * @access public
 944          */
 945         function escapeFullURL( $query = '' ) {
 946                 return htmlspecialchars( $this->getFullURL( $query ) );
 947         }
 948
 949         /**
 950          * Get the URL form for an internal link.
 951          * - Used in various Squid-related code, in case we have a different
 952          * internal hostname for the server from the exposed one.
 953          *
 954          * @param string $query an optional query string
 955          * @param string $variant language variant of url (for sr, zh..)
 956          * @return string the URL
 957          * @access public
 958          */
 959         function getInternalURL( $query = '', $variant = false ) {
 960                 global $wgInternalServer;
 961                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 962                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 963                 return $url;
 964         }
 965
 966         /**
 967          * Get the edit URL for this Title
 968          * @return string the URL, or a null string if this is an
 969          *      interwiki link
 970          * @access public
 971          */
 972         function getEditURL() {
 973                 if ( '' != $this->mInterwiki ) { return ''; }
 974                 $s = $this->getLocalURL( 'action=edit' );
 975
 976                 return $s;
 977         }
 978
 979         /**
 980          * Get the HTML-escaped displayable text form.
 981          * Used for the title field in <a> tags.
 982          * @return string the text, including any prefixes
 983          * @access public
 984          */
 985         function getEscapedText() {
 986                 return htmlspecialchars( $this->getPrefixedText() );
 987         }
 988
 989         /**
 990          * Is this Title interwiki?
 991          * @return boolean
 992          * @access public
 993          */
 994         function isExternal() { return ( '' != $this->mInterwiki ); }
 995
 996         /**
 997          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 998          *
 999          * @param string Action to check (default: edit)
1000          * @return bool
1001          */
1002         function isSemiProtected( $action = 'edit' ) {
1003                 if( $this->exists() ) {
1004                         $restrictions = $this->getRestrictions( $action );
1005                         if( count( $restrictions ) > 0 ) {
1006                                 foreach( $restrictions as $restriction ) {
1007                                         if( strtolower( $restriction ) != 'autoconfirmed' )
1008                                                 return false;
1009                                 }
1010                         } else {
1011                                 # Not protected
1012                                 return false;
1013                         }
1014                         return true;
1015                 } else {
1016                         # If it doesn't exist, it can't be protected
1017                         return false;
1018                 }
1019         }
1020
1021         /**
1022          * Does the title correspond to a protected article?
1023          * @param string $what the action the page is protected from,
1024          *      by default checks move and edit
1025          * @return boolean
1026          * @access public
1027          */
1028         function isProtected( $action = '' ) {
1029                 global $wgRestrictionLevels;
1030                 if ( NS_SPECIAL == $this->mNamespace ) { return true; }
1031
1032                 if( $action == 'edit' || $action == '' ) {
1033                         $r = $this->getRestrictions( 'edit' );
1034                         foreach( $wgRestrictionLevels as $level ) {
1035                                 if( in_array( $level, $r ) && $level != '' ) {
1036                                         return( true );
1037                                 }
1038                         }
1039                 }
1040
1041                 if( $action == 'move' || $action == '' ) {
1042                         $r = $this->getRestrictions( 'move' );
1043                         foreach( $wgRestrictionLevels as $level ) {
1044                                 if( in_array( $level, $r ) && $level != '' ) {
1045                                         return( true );
1046                                 }
1047                         }
1048                 }
1049
1050                 return false;
1051         }
1052
1053         /**
1054          * Is $wgUser is watching this page?
1055          * @return boolean
1056          * @access public
1057          */
1058         function userIsWatching() {
1059                 global $wgUser;
1060
1061                 if ( is_null( $this->mWatched ) ) {
1062                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1063                                 $this->mWatched = false;
1064                         } else {
1065                                 $this->mWatched = $wgUser->isWatched( $this );
1066                         }
1067                 }
1068                 return $this->mWatched;
1069         }
1070
1071         /**
1072          * Can $wgUser perform $action this page?
1073          * @param string $action action that permission needs to be checked for
1074          * @return boolean
1075          * @private
1076          */
1077         function userCan($action) {
1078                 $fname = 'Title::userCan';
1079                 wfProfileIn( $fname );
1080
1081                 global $wgUser;
1082
1083                 $result = null;
1084                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1085                 if ( $result !== null ) {
1086                         wfProfileOut( $fname );
1087                         return $result;
1088                 }
1089
1090                 if( NS_SPECIAL == $this->mNamespace ) {
1091                         wfProfileOut( $fname );
1092                         return false;
1093                 }
1094                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
1095                 // from taking effect -ævar
1096                 if( NS_MEDIAWIKI == $this->mNamespace &&
1097                     !$wgUser->isAllowed('editinterface') ) {
1098                         wfProfileOut( $fname );
1099                         return false;
1100                 }
1101
1102                 if( $this->mDbkeyform == '_' ) {
1103                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1104                         wfProfileOut( $fname );
1105                         return false;
1106                 }
1107
1108                 # protect css/js subpages of user pages
1109                 # XXX: this might be better using restrictions
1110                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1111                 if( $this->isCssJsSubpage()
1112                         && !$wgUser->isAllowed('editinterface')
1113                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1114                         wfProfileOut( $fname );
1115                         return false;
1116                 }
1117
1118                 foreach( $this->getRestrictions($action) as $right ) {
1119                         // Backwards compatibility, rewrite sysop -> protect
1120                         if ( $right == 'sysop' ) {
1121                                 $right = 'protect';
1122                         }
1123                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1124                                 wfProfileOut( $fname );
1125                                 return false;
1126                         }
1127                 }
1128
1129                 if( $action == 'move' &&
1130                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1131                         wfProfileOut( $fname );
1132                         return false;
1133                 }
1134
1135                 if( $action == 'create' ) {
1136                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1137                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1138                                 wfProfileOut( $fname );
1139                                 return false;
1140                         }
1141                 }
1142
1143                 wfProfileOut( $fname );
1144                 return true;
1145         }
1146
1147         /**
1148          * Can $wgUser edit this page?
1149          * @return boolean
1150          * @access public
1151          */
1152         function userCanEdit() {
1153                 return $this->userCan('edit');
1154         }
1155
1156         /**
1157          * Can $wgUser create this page?
1158          * @return boolean
1159          * @access public
1160          */
1161         function userCanCreate() {
1162                 return $this->userCan('create');
1163         }
1164
1165         /**
1166          * Can $wgUser move this page?
1167          * @return boolean
1168          * @access public
1169          */
1170         function userCanMove() {
1171                 return $this->userCan('move');
1172         }
1173
1174         /**
1175          * Would anybody with sufficient privileges be able to move this page?
1176          * Some pages just aren't movable.
1177          *
1178          * @return boolean
1179          * @access public
1180          */
1181         function isMovable() {
1182                 return Namespace::isMovable( $this->getNamespace() )
1183                         && $this->getInterwiki() == '';
1184         }
1185
1186         /**
1187          * Can $wgUser read this page?
1188          * @return boolean
1189          * @access public
1190          */
1191         function userCanRead() {
1192                 global $wgUser;
1193
1194                 $result = null;
1195                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1196                 if ( $result !== null ) {
1197                         return $result;
1198                 }
1199
1200                 if( $wgUser->isAllowed('read') ) {
1201                         return true;
1202                 } else {
1203                         global $wgWhitelistRead;
1204
1205                         /**
1206                          * Always grant access to the login page.
1207                          * Even anons need to be able to log in.
1208                         */
1209                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1210                                 return true;
1211                         }
1212
1213                         /** some pages are explicitly allowed */
1214                         $name = $this->getPrefixedText();
1215                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1216                                 return true;
1217                         }
1218
1219                         # Compatibility with old settings
1220                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1221                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1222                                         return true;
1223                                 }
1224                         }
1225                 }
1226                 return false;
1227         }
1228
1229         /**
1230          * Is this a talk page of some sort?
1231          * @return bool
1232          * @access public
1233          */
1234         function isTalkPage() {
1235                 return Namespace::isTalk( $this->getNamespace() );
1236         }
1237
1238         /**
1239          * Is this a subpage?
1240          * @return bool
1241          * @access public
1242          */
1243         function isSubpage() {
1244                 global $wgNamespacesWithSubpages;
1245
1246                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1247                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1248                 } else {
1249                         return false;
1250                 }
1251         }
1252
1253         /**
1254          * Is this a .css or .js subpage of a user page?
1255          * @return bool
1256          * @access public
1257          */
1258         function isCssJsSubpage() {
1259                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(css|js)$/", $this->mTextform ) );
1260         }
1261         /**
1262          * Is this a *valid* .css or .js subpage of a user page?
1263          * Check that the corresponding skin exists
1264          */
1265         function isValidCssJsSubpage() {
1266                 if ( $this->isCssJsSubpage() ) {
1267                         $skinNames = Skin::getSkinNames();
1268                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1269                 } else {
1270                         return false;
1271                 }
1272         }
1273         /**
1274          * Trim down a .css or .js subpage title to get the corresponding skin name
1275          */
1276         function getSkinFromCssJsSubpage() {
1277                 $subpage = explode( '/', $this->mTextform );
1278                 $subpage = $subpage[ count( $subpage ) - 1 ];
1279                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1280         }
1281         /**
1282          * Is this a .css subpage of a user page?
1283          * @return bool
1284          * @access public
1285          */
1286         function isCssSubpage() {
1287                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1288         }
1289         /**
1290          * Is this a .js subpage of a user page?
1291          * @return bool
1292          * @access public
1293          */
1294         function isJsSubpage() {
1295                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1296         }
1297         /**
1298          * Protect css/js subpages of user pages: can $wgUser edit
1299          * this page?
1300          *
1301          * @return boolean
1302          * @todo XXX: this might be better using restrictions
1303          * @access public
1304          */
1305         function userCanEditCssJsSubpage() {
1306                 global $wgUser;
1307                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1308         }
1309
1310         /**
1311          * Loads a string into mRestrictions array
1312          * @param string $res restrictions in string format
1313          * @access public
1314          */
1315         function loadRestrictions( $res ) {
1316                 $this->mRestrictions['edit'] = array();
1317                 $this->mRestrictions['move'] = array();
1318
1319                 if( !$res ) {
1320                         # No restrictions (page_restrictions blank)
1321                         $this->mRestrictionsLoaded = true;
1322                         return;
1323                 }
1324
1325                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1326                         $temp = explode( '=', trim( $restrict ) );
1327                         if(count($temp) == 1) {
1328                                 // old format should be treated as edit/move restriction
1329                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1330                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1331                         } else {
1332                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1333                         }
1334                 }
1335                 $this->mRestrictionsLoaded = true;
1336         }
1337
1338         /**
1339          * Accessor/initialisation for mRestrictions
1340          *
1341          * @access public
1342          * @param string $action action that permission needs to be checked for
1343          * @return array the array of groups allowed to edit this article
1344          */
1345         function getRestrictions( $action ) {
1346                 if( $this->exists() ) {
1347                         if( !$this->mRestrictionsLoaded ) {
1348                                 $dbr =& wfGetDB( DB_SLAVE );
1349                                 $res = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ) );
1350                                 $this->loadRestrictions( $res );
1351                         }
1352                         return isset( $this->mRestrictions[$action] )
1353                                         ? $this->mRestrictions[$action]
1354                                         : array();
1355                 } else {
1356                         return array();
1357                 }
1358         }
1359
1360         /**
1361          * Is there a version of this page in the deletion archive?
1362          * @return int the number of archived revisions
1363          * @access public
1364          */
1365         function isDeleted() {
1366                 $fname = 'Title::isDeleted';
1367                 if ( $this->getNamespace() < 0 ) {
1368                         $n = 0;
1369                 } else {
1370                         $dbr =& wfGetDB( DB_SLAVE );
1371                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1372                                 'ar_title' => $this->getDBkey() ), $fname );
1373                         if( $this->getNamespace() == NS_IMAGE ) {
1374                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1375                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1376                         }
1377                 }
1378                 return (int)$n;
1379         }
1380
1381         /**
1382          * Get the article ID for this Title from the link cache,
1383          * adding it if necessary
1384          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1385          *      for update
1386          * @return int the ID
1387          */
1388         public function getArticleID( $flags = 0 ) {
1389                 $linkCache =& LinkCache::singleton();
1390                 if ( $flags & GAID_FOR_UPDATE ) {
1391                         $oldUpdate = $linkCache->forUpdate( true );
1392                         $this->mArticleID = $linkCache->addLinkObj( $this );
1393                         $linkCache->forUpdate( $oldUpdate );
1394                 } else {
1395                         if ( -1 == $this->mArticleID ) {
1396                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1397                         }
1398                 }
1399                 return $this->mArticleID;
1400         }
1401
1402         function getLatestRevID() {
1403                 if ($this->mLatestID !== false)
1404                         return $this->mLatestID;
1405
1406                 $db =& wfGetDB(DB_SLAVE);
1407                 return $this->mLatestID = $db->selectField( 'revision',
1408                         "max(rev_id)",
1409                         array('rev_page' => $this->getArticleID()),
1410                         'Title::getLatestRevID' );
1411         }
1412
1413         /**
1414          * This clears some fields in this object, and clears any associated
1415          * keys in the "bad links" section of the link cache.
1416          *
1417          * - This is called from Article::insertNewArticle() to allow
1418          * loading of the new page_id. It's also called from
1419          * Article::doDeleteArticle()
1420          *
1421          * @param int $newid the new Article ID
1422          * @access public
1423          */
1424         function resetArticleID( $newid ) {
1425                 $linkCache =& LinkCache::singleton();
1426                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1427
1428                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1429                 else { $this->mArticleID = $newid; }
1430                 $this->mRestrictionsLoaded = false;
1431                 $this->mRestrictions = array();
1432         }
1433
1434         /**
1435          * Updates page_touched for this page; called from LinksUpdate.php
1436          * @return bool true if the update succeded
1437          * @access public
1438          */
1439         function invalidateCache() {
1440                 global $wgUseFileCache;
1441
1442                 if ( wfReadOnly() ) {
1443                         return;
1444                 }
1445
1446                 $dbw =& wfGetDB( DB_MASTER );
1447                 $success = $dbw->update( 'page',
1448                         array( /* SET */
1449                                 'page_touched' => $dbw->timestamp()
1450                         ), array( /* WHERE */
1451                                 'page_namespace' => $this->getNamespace() ,
1452                                 'page_title' => $this->getDBkey()
1453                         ), 'Title::invalidateCache'
1454                 );
1455
1456                 if ($wgUseFileCache) {
1457                         $cache = new HTMLFileCache($this);
1458                         @unlink($cache->fileCacheName());
1459                 }
1460
1461                 return $success;
1462         }
1463
1464         /**
1465          * Prefix some arbitrary text with the namespace or interwiki prefix
1466          * of this object
1467          *
1468          * @param string $name the text
1469          * @return string the prefixed text
1470          * @private
1471          */
1472         /* private */ function prefix( $name ) {
1473                 $p = '';
1474                 if ( '' != $this->mInterwiki ) {
1475                         $p = $this->mInterwiki . ':';
1476                 }
1477                 if ( 0 != $this->mNamespace ) {
1478                         $p .= $this->getNsText() . ':';
1479                 }
1480                 return $p . $name;
1481         }
1482
1483         /**
1484          * Secure and split - main initialisation function for this object
1485          *
1486          * Assumes that mDbkeyform has been set, and is urldecoded
1487          * and uses underscores, but not otherwise munged.  This function
1488          * removes illegal characters, splits off the interwiki and
1489          * namespace prefixes, sets the other forms, and canonicalizes
1490          * everything.
1491          * @return bool true on success
1492          * @private
1493          */
1494         /* private */ function secureAndSplit() {
1495                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1496
1497                 # Initialisation
1498                 static $rxTc = false;
1499                 if( !$rxTc ) {
1500                         # % is needed as well
1501                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1502                 }
1503
1504                 $this->mInterwiki = $this->mFragment = '';
1505                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1506
1507                 $dbkey = $this->mDbkeyform;
1508
1509                 # Strip Unicode bidi override characters.
1510                 # Sometimes they slip into cut-n-pasted page titles, where the
1511                 # override chars get included in list displays.
1512                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1513                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1514
1515                 # Clean up whitespace
1516                 #
1517                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1518                 $dbkey = trim( $dbkey, '_' );
1519
1520                 if ( '' == $dbkey ) {
1521                         return false;
1522                 }
1523
1524                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1525                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1526                         return false;
1527                 }
1528
1529                 $this->mDbkeyform = $dbkey;
1530
1531                 # Initial colon indicates main namespace rather than specified default
1532                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1533                 if ( ':' == $dbkey{0} ) {
1534                         $this->mNamespace = NS_MAIN;
1535                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1536                 }
1537
1538                 # Namespace or interwiki prefix
1539                 $firstPass = true;
1540                 do {
1541                         $m = array();
1542                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1543                                 $p = $m[1];
1544                                 $lowerNs = $wgContLang->lc( $p );
1545                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1546                                         # Canonical namespace
1547                                         $dbkey = $m[2];
1548                                         $this->mNamespace = $ns;
1549                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1550                                         # Ordinary namespace
1551                                         $dbkey = $m[2];
1552                                         $this->mNamespace = $ns;
1553                                 } elseif( $this->getInterwikiLink( $p ) ) {
1554                                         if( !$firstPass ) {
1555                                                 # Can't make a local interwiki link to an interwiki link.
1556                                                 # That's just crazy!
1557                                                 return false;
1558                                         }
1559
1560                                         # Interwiki link
1561                                         $dbkey = $m[2];
1562                                         $this->mInterwiki = $wgContLang->lc( $p );
1563
1564                                         # Redundant interwiki prefix to the local wiki
1565                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1566                                                 if( $dbkey == '' ) {
1567                                                         # Can't have an empty self-link
1568                                                         return false;
1569                                                 }
1570                                                 $this->mInterwiki = '';
1571                                                 $firstPass = false;
1572                                                 # Do another namespace split...
1573                                                 continue;
1574                                         }
1575
1576                                         # If there's an initial colon after the interwiki, that also
1577                                         # resets the default namespace
1578                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1579                                                 $this->mNamespace = NS_MAIN;
1580                                                 $dbkey = substr( $dbkey, 1 );
1581                                         }
1582                                 }
1583                                 # If there's no recognized interwiki or namespace,
1584                                 # then let the colon expression be part of the title.
1585                         }
1586                         break;
1587                 } while( true );
1588
1589                 # We already know that some pages won't be in the database!
1590                 #
1591                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1592                         $this->mArticleID = 0;
1593                 }
1594                 $fragment = strstr( $dbkey, '#' );
1595                 if ( false !== $fragment ) {
1596                         $this->setFragment( $fragment );
1597                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1598                         # remove whitespace again: prevents "Foo_bar_#"
1599                         # becoming "Foo_bar_"
1600                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1601                 }
1602
1603                 # Reject illegal characters.
1604                 #
1605                 if( preg_match( $rxTc, $dbkey ) ) {
1606                         return false;
1607                 }
1608
1609                 /**
1610                  * Pages with "/./" or "/../" appearing in the URLs will
1611                  * often be unreachable due to the way web browsers deal
1612                  * with 'relative' URLs. Forbid them explicitly.
1613                  */
1614                 if ( strpos( $dbkey, '.' ) !== false &&
1615                      ( $dbkey === '.' || $dbkey === '..' ||
1616                        strpos( $dbkey, './' ) === 0  ||
1617                        strpos( $dbkey, '../' ) === 0 ||
1618                        strpos( $dbkey, '/./' ) !== false ||
1619                        strpos( $dbkey, '/../' ) !== false ) )
1620                 {
1621                         return false;
1622                 }
1623
1624                 /**
1625                  * Limit the size of titles to 255 bytes.
1626                  * This is typically the size of the underlying database field.
1627                  * We make an exception for special pages, which don't need to be stored
1628                  * in the database, and may edge over 255 bytes due to subpage syntax
1629                  * for long titles, e.g. [[Special:Block/Long name]]
1630                  */
1631                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1632                   strlen( $dbkey ) > 512 )
1633                 {
1634                         return false;
1635                 }
1636
1637                 /**
1638                  * Normally, all wiki links are forced to have
1639                  * an initial capital letter so [[foo]] and [[Foo]]
1640                  * point to the same place.
1641                  *
1642                  * Don't force it for interwikis, since the other
1643                  * site might be case-sensitive.
1644                  */
1645                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1646                         $dbkey = $wgContLang->ucfirst( $dbkey );
1647                 }
1648
1649                 /**
1650                  * Can't make a link to a namespace alone...
1651                  * "empty" local links can only be self-links
1652                  * with a fragment identifier.
1653                  */
1654                 if( $dbkey == '' &&
1655                         $this->mInterwiki == '' &&
1656                         $this->mNamespace != NS_MAIN ) {
1657                         return false;
1658                 }
1659
1660                 // Any remaining initial :s are illegal.
1661                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1662                         return false;
1663                 }
1664
1665                 # Fill fields
1666                 $this->mDbkeyform = $dbkey;
1667                 $this->mUrlform = wfUrlencode( $dbkey );
1668
1669                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1670
1671                 return true;
1672         }
1673
1674         /**
1675          * Set the fragment for this title
1676          * This is kind of bad, since except for this rarely-used function, Title objects
1677          * are immutable. The reason this is here is because it's better than setting the
1678          * members directly, which is what Linker::formatComment was doing previously.
1679          *
1680          * @param string $fragment text
1681          * @access kind of public
1682          */
1683         function setFragment( $fragment ) {
1684                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1685         }
1686
1687         /**
1688          * Get a Title object associated with the talk page of this article
1689          * @return Title the object for the talk page
1690          * @access public
1691          */
1692         function getTalkPage() {
1693                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1694         }
1695
1696         /**
1697          * Get a title object associated with the subject page of this
1698          * talk page
1699          *
1700          * @return Title the object for the subject page
1701          * @access public
1702          */
1703         function getSubjectPage() {
1704                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1705         }
1706
1707         /**
1708          * Get an array of Title objects linking to this Title
1709          * Also stores the IDs in the link cache.
1710          *
1711          * WARNING: do not use this function on arbitrary user-supplied titles!
1712          * On heavily-used templates it will max out the memory.
1713          *
1714          * @param string $options may be FOR UPDATE
1715          * @return array the Title objects linking here
1716          * @access public
1717          */
1718         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1719                 $linkCache =& LinkCache::singleton();
1720
1721                 if ( $options ) {
1722                         $db =& wfGetDB( DB_MASTER );
1723                 } else {
1724                         $db =& wfGetDB( DB_SLAVE );
1725                 }
1726
1727                 $res = $db->select( array( 'page', $table ),
1728                         array( 'page_namespace', 'page_title', 'page_id' ),
1729                         array(
1730                                 "{$prefix}_from=page_id",
1731                                 "{$prefix}_namespace" => $this->getNamespace(),
1732                                 "{$prefix}_title"     => $this->getDbKey() ),
1733                         'Title::getLinksTo',
1734                         $options );
1735
1736                 $retVal = array();
1737                 if ( $db->numRows( $res ) ) {
1738                         while ( $row = $db->fetchObject( $res ) ) {
1739                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1740                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1741                                         $retVal[] = $titleObj;
1742                                 }
1743                         }
1744                 }
1745                 $db->freeResult( $res );
1746                 return $retVal;
1747         }
1748
1749         /**
1750          * Get an array of Title objects using this Title as a template
1751          * Also stores the IDs in the link cache.
1752          *
1753          * WARNING: do not use this function on arbitrary user-supplied titles!
1754          * On heavily-used templates it will max out the memory.
1755          *
1756          * @param string $options may be FOR UPDATE
1757          * @return array the Title objects linking here
1758          * @access public
1759          */
1760         function getTemplateLinksTo( $options = '' ) {
1761                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1762         }
1763
1764         /**
1765          * Get an array of Title objects referring to non-existent articles linked from this page
1766          *
1767          * @param string $options may be FOR UPDATE
1768          * @return array the Title objects
1769          * @access public
1770          */
1771         function getBrokenLinksFrom( $options = '' ) {
1772                 if ( $options ) {
1773                         $db =& wfGetDB( DB_MASTER );
1774                 } else {
1775                         $db =& wfGetDB( DB_SLAVE );
1776                 }
1777
1778                 $res = $db->safeQuery(
1779                           "SELECT pl_namespace, pl_title
1780                              FROM !
1781                         LEFT JOIN !
1782                                ON pl_namespace=page_namespace
1783                               AND pl_title=page_title
1784                             WHERE pl_from=?
1785                               AND page_namespace IS NULL
1786                                   !",
1787                         $db->tableName( 'pagelinks' ),
1788                         $db->tableName( 'page' ),
1789                         $this->getArticleId(),
1790                         $options );
1791
1792                 $retVal = array();
1793                 if ( $db->numRows( $res ) ) {
1794                         while ( $row = $db->fetchObject( $res ) ) {
1795                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1796                         }
1797                 }
1798                 $db->freeResult( $res );
1799                 return $retVal;
1800         }
1801
1802
1803         /**
1804          * Get a list of URLs to purge from the Squid cache when this
1805          * page changes
1806          *
1807          * @return array the URLs
1808          * @access public
1809          */
1810         function getSquidURLs() {
1811                 global $wgContLang;
1812
1813                 $urls = array(
1814                         $this->getInternalURL(),
1815                         $this->getInternalURL( 'action=history' )
1816                 );
1817
1818                 // purge variant urls as well
1819                 if($wgContLang->hasVariants()){
1820                         $variants = $wgContLang->getVariants();
1821                         foreach($variants as $vCode){
1822                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
1823                                 $urls[] = $this->getInternalURL('',$vCode);
1824                         }
1825                 }
1826
1827                 return $urls;
1828         }
1829
1830         function purgeSquid() {
1831                 global $wgUseSquid;
1832                 if ( $wgUseSquid ) {
1833                         $urls = $this->getSquidURLs();
1834                         $u = new SquidUpdate( $urls );
1835                         $u->doUpdate();
1836                 }
1837         }
1838
1839         /**
1840          * Move this page without authentication
1841          * @param Title &$nt the new page Title
1842          * @access public
1843          */
1844         function moveNoAuth( &$nt ) {
1845                 return $this->moveTo( $nt, false );
1846         }
1847
1848         /**
1849          * Check whether a given move operation would be valid.
1850          * Returns true if ok, or a message key string for an error message
1851          * if invalid. (Scarrrrry ugly interface this.)
1852          * @param Title &$nt the new title
1853          * @param bool $auth indicates whether $wgUser's permissions
1854          *      should be checked
1855          * @return mixed true on success, message name on failure
1856          * @access public
1857          */
1858         function isValidMoveOperation( &$nt, $auth = true ) {
1859                 if( !$this or !$nt ) {
1860                         return 'badtitletext';
1861                 }
1862                 if( $this->equals( $nt ) ) {
1863                         return 'selfmove';
1864                 }
1865                 if( !$this->isMovable() || !$nt->isMovable() ) {
1866                         return 'immobile_namespace';
1867                 }
1868
1869                 $oldid = $this->getArticleID();
1870                 $newid = $nt->getArticleID();
1871
1872                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1873                         return 'articleexists';
1874                 }
1875                 if ( ( '' == $this->getDBkey() ) ||
1876                          ( !$oldid ) ||
1877                      ( '' == $nt->getDBkey() ) ) {
1878                         return 'badarticleerror';
1879                 }
1880
1881                 if ( $auth && (
1882                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1883                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1884                         return 'protectedpage';
1885                 }
1886
1887                 # The move is allowed only if (1) the target doesn't exist, or
1888                 # (2) the target is a redirect to the source, and has no history
1889                 # (so we can undo bad moves right after they're done).
1890
1891                 if ( 0 != $newid ) { # Target exists; check for validity
1892                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1893                                 return 'articleexists';
1894                         }
1895                 }
1896                 return true;
1897         }
1898
1899         /**
1900          * Move a title to a new location
1901          * @param Title &$nt the new title
1902          * @param bool $auth indicates whether $wgUser's permissions
1903          *      should be checked
1904          * @return mixed true on success, message name on failure
1905          * @access public
1906          */
1907         function moveTo( &$nt, $auth = true, $reason = '' ) {
1908                 $err = $this->isValidMoveOperation( $nt, $auth );
1909                 if( is_string( $err ) ) {
1910                         return $err;
1911                 }
1912
1913                 $pageid = $this->getArticleID();
1914                 if( $nt->exists() ) {
1915                         $this->moveOverExistingRedirect( $nt, $reason );
1916                         $pageCountChange = 0;
1917                 } else { # Target didn't exist, do normal move.
1918                         $this->moveToNewTitle( $nt, $reason );
1919                         $pageCountChange = 1;
1920                 }
1921                 $redirid = $this->getArticleID();
1922
1923                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1924                 $dbw =& wfGetDB( DB_MASTER );
1925                 $categorylinks = $dbw->tableName( 'categorylinks' );
1926                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1927                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1928                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1929                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1930
1931                 # Update watchlists
1932
1933                 $oldnamespace = $this->getNamespace() & ~1;
1934                 $newnamespace = $nt->getNamespace() & ~1;
1935                 $oldtitle = $this->getDBkey();
1936                 $newtitle = $nt->getDBkey();
1937
1938                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1939                         WatchedItem::duplicateEntries( $this, $nt );
1940                 }
1941
1942                 # Update search engine
1943                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1944                 $u->doUpdate();
1945                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1946                 $u->doUpdate();
1947
1948                 # Update site_stats
1949                 if( $this->isContentPage() && !$nt->isContentPage() ) {
1950                         # No longer a content page
1951                         # Not viewed, edited, removing
1952                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
1953                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
1954                         # Now a content page
1955                         # Not viewed, edited, adding
1956                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1957                 } elseif( $pageCountChange ) {
1958                         # Redirect added
1959                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1960                 } else {
1961                         # Nothing special
1962                         $u = false;
1963                 }
1964                 if( $u )
1965                         $u->doUpdate();
1966
1967                 global $wgUser;
1968                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1969                 return true;
1970         }
1971
1972         /**
1973          * Move page to a title which is at present a redirect to the
1974          * source page
1975          *
1976          * @param Title &$nt the page to move to, which should currently
1977          *      be a redirect
1978          * @private
1979          */
1980         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1981                 global $wgUseSquid;
1982                 $fname = 'Title::moveOverExistingRedirect';
1983                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1984
1985                 if ( $reason ) {
1986                         $comment .= ": $reason";
1987                 }
1988
1989                 $now = wfTimestampNow();
1990                 $newid = $nt->getArticleID();
1991                 $oldid = $this->getArticleID();
1992                 $dbw =& wfGetDB( DB_MASTER );
1993                 $linkCache =& LinkCache::singleton();
1994
1995                 # Delete the old redirect. We don't save it to history since
1996                 # by definition if we've got here it's rather uninteresting.
1997                 # We have to remove it so that the next step doesn't trigger
1998                 # a conflict on the unique namespace+title index...
1999                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2000
2001                 # Save a null revision in the page's history notifying of the move
2002                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2003                 $nullRevId = $nullRevision->insertOn( $dbw );
2004
2005                 # Change the name of the target page:
2006                 $dbw->update( 'page',
2007                         /* SET */ array(
2008                                 'page_touched'   => $dbw->timestamp($now),
2009                                 'page_namespace' => $nt->getNamespace(),
2010                                 'page_title'     => $nt->getDBkey(),
2011                                 'page_latest'    => $nullRevId,
2012                         ),
2013                         /* WHERE */ array( 'page_id' => $oldid ),
2014                         $fname
2015                 );
2016                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2017
2018                 # Recreate the redirect, this time in the other direction.
2019                 $mwRedir = MagicWord::get( 'redirect' );
2020                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2021                 $redirectArticle = new Article( $this );
2022                 $newid = $redirectArticle->insertOn( $dbw );
2023                 $redirectRevision = new Revision( array(
2024                         'page'    => $newid,
2025                         'comment' => $comment,
2026                         'text'    => $redirectText ) );
2027                 $redirectRevision->insertOn( $dbw );
2028                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2029                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2030
2031                 # Log the move
2032                 $log = new LogPage( 'move' );
2033                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2034
2035                 # Now, we record the link from the redirect to the new title.
2036                 # It should have no other outgoing links...
2037                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2038                 $dbw->insert( 'pagelinks',
2039                         array(
2040                                 'pl_from'      => $newid,
2041                                 'pl_namespace' => $nt->getNamespace(),
2042                                 'pl_title'     => $nt->getDbKey() ),
2043                         $fname );
2044
2045                 # Purge squid
2046                 if ( $wgUseSquid ) {
2047                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2048                         $u = new SquidUpdate( $urls );
2049                         $u->doUpdate();
2050                 }
2051         }
2052
2053         /**
2054          * Move page to non-existing title.
2055          * @param Title &$nt the new Title
2056          * @private
2057          */
2058         function moveToNewTitle( &$nt, $reason = '' ) {
2059                 global $wgUseSquid;
2060                 $fname = 'MovePageForm::moveToNewTitle';
2061                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2062                 if ( $reason ) {
2063                         $comment .= ": $reason";
2064                 }
2065
2066                 $newid = $nt->getArticleID();
2067                 $oldid = $this->getArticleID();
2068                 $dbw =& wfGetDB( DB_MASTER );
2069                 $now = $dbw->timestamp();
2070                 $linkCache =& LinkCache::singleton();
2071
2072                 # Save a null revision in the page's history notifying of the move
2073                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2074                 $nullRevId = $nullRevision->insertOn( $dbw );
2075
2076                 # Rename cur entry
2077                 $dbw->update( 'page',
2078                         /* SET */ array(
2079                                 'page_touched'   => $now,
2080                                 'page_namespace' => $nt->getNamespace(),
2081                                 'page_title'     => $nt->getDBkey(),
2082                                 'page_latest'    => $nullRevId,
2083                         ),
2084                         /* WHERE */ array( 'page_id' => $oldid ),
2085                         $fname
2086                 );
2087
2088                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2089
2090                 # Insert redirect
2091                 $mwRedir = MagicWord::get( 'redirect' );
2092                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2093                 $redirectArticle = new Article( $this );
2094                 $newid = $redirectArticle->insertOn( $dbw );
2095                 $redirectRevision = new Revision( array(
2096                         'page'    => $newid,
2097                         'comment' => $comment,
2098                         'text'    => $redirectText ) );
2099                 $redirectRevision->insertOn( $dbw );
2100                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2101                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2102
2103                 # Log the move
2104                 $log = new LogPage( 'move' );
2105                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2106
2107                 # Purge caches as per article creation
2108                 Article::onArticleCreate( $nt );
2109
2110                 # Record the just-created redirect's linking to the page
2111                 $dbw->insert( 'pagelinks',
2112                         array(
2113                                 'pl_from'      => $newid,
2114                                 'pl_namespace' => $nt->getNamespace(),
2115                                 'pl_title'     => $nt->getDBkey() ),
2116                         $fname );
2117
2118                 # Purge old title from squid
2119                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2120                 $this->purgeSquid();
2121         }
2122
2123         /**
2124          * Checks if $this can be moved to a given Title
2125          * - Selects for update, so don't call it unless you mean business
2126          *
2127          * @param Title &$nt the new title to check
2128          * @access public
2129          */
2130         function isValidMoveTarget( $nt ) {
2131
2132                 $fname = 'Title::isValidMoveTarget';
2133                 $dbw =& wfGetDB( DB_MASTER );
2134
2135                 # Is it a redirect?
2136                 $id  = $nt->getArticleID();
2137                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2138                         array( 'page_is_redirect','old_text','old_flags' ),
2139                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2140                         $fname, 'FOR UPDATE' );
2141
2142                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2143                         # Not a redirect
2144                         wfDebug( __METHOD__ . ": not a redirect\n" );
2145                         return false;
2146                 }
2147                 $text = Revision::getRevisionText( $obj );
2148
2149                 # Does the redirect point to the source?
2150                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2151                 $m = array();
2152                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2153                         $redirTitle = Title::newFromText( $m[1] );
2154                         if( !is_object( $redirTitle ) ||
2155                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2156                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2157                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2158                                 return false;
2159                         }
2160                 } else {
2161                         # Fail safe
2162                         wfDebug( __METHOD__ . ": failsafe\n" );
2163                         return false;
2164                 }
2165
2166                 # Does the article have a history?
2167                 $row = $dbw->selectRow( array( 'page', 'revision'),
2168                         array( 'rev_id' ),
2169                         array( 'page_namespace' => $nt->getNamespace(),
2170                                 'page_title' => $nt->getDBkey(),
2171                                 'page_id=rev_page AND page_latest != rev_id'
2172                         ), $fname, 'FOR UPDATE'
2173                 );
2174
2175                 # Return true if there was no history
2176                 return $row === false;
2177         }
2178
2179         /**
2180          * Create a redirect; fails if the title already exists; does
2181          * not notify RC
2182          *
2183          * @param Title $dest the destination of the redirect
2184          * @param string $comment the comment string describing the move
2185          * @return bool true on success
2186          * @access public
2187          */
2188         function createRedirect( $dest, $comment ) {
2189                 if ( $this->getArticleID() ) {
2190                         return false;
2191                 }
2192
2193                 $fname = 'Title::createRedirect';
2194                 $dbw =& wfGetDB( DB_MASTER );
2195
2196                 $article = new Article( $this );
2197                 $newid = $article->insertOn( $dbw );
2198                 $revision = new Revision( array(
2199                         'page'      => $newid,
2200                         'comment'   => $comment,
2201                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2202                         ) );
2203                 $revision->insertOn( $dbw );
2204                 $article->updateRevisionOn( $dbw, $revision, 0 );
2205
2206                 # Link table
2207                 $dbw->insert( 'pagelinks',
2208                         array(
2209                                 'pl_from'      => $newid,
2210                                 'pl_namespace' => $dest->getNamespace(),
2211                                 'pl_title'     => $dest->getDbKey()
2212                         ), $fname
2213                 );
2214
2215                 Article::onArticleCreate( $this );
2216                 return true;
2217         }
2218
2219         /**
2220          * Get categories to which this Title belongs and return an array of
2221          * categories' names.
2222          *
2223          * @return array an array of parents in the form:
2224          *      $parent => $currentarticle
2225          * @access public
2226          */
2227         function getParentCategories() {
2228                 global $wgContLang;
2229
2230                 $titlekey = $this->getArticleId();
2231                 $dbr =& wfGetDB( DB_SLAVE );
2232                 $categorylinks = $dbr->tableName( 'categorylinks' );
2233
2234                 # NEW SQL
2235                 $sql = "SELECT * FROM $categorylinks"
2236                      ." WHERE cl_from='$titlekey'"
2237                          ." AND cl_from <> '0'"
2238                          ." ORDER BY cl_sortkey";
2239
2240                 $res = $dbr->query ( $sql ) ;
2241
2242                 if($dbr->numRows($res) > 0) {
2243                         while ( $x = $dbr->fetchObject ( $res ) )
2244                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2245                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2246                         $dbr->freeResult ( $res ) ;
2247                 } else {
2248                         $data = '';
2249                 }
2250                 return $data;
2251         }
2252
2253         /**
2254          * Get a tree of parent categories
2255          * @param array $children an array with the children in the keys, to check for circular refs
2256          * @return array
2257          * @access public
2258          */
2259         function getParentCategoryTree( $children = array() ) {
2260                 $parents = $this->getParentCategories();
2261
2262                 if($parents != '') {
2263                         foreach($parents as $parent => $current) {
2264                                 if ( array_key_exists( $parent, $children ) ) {
2265                                         # Circular reference
2266                                         $stack[$parent] = array();
2267                                 } else {
2268                                         $nt = Title::newFromText($parent);
2269                                         if ( $nt ) {
2270                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2271                                         }
2272                                 }
2273                         }
2274                         return $stack;
2275                 } else {
2276                         return array();
2277                 }
2278         }
2279
2280
2281         /**
2282          * Get an associative array for selecting this title from
2283          * the "page" table
2284          *
2285          * @return array
2286          * @access public
2287          */
2288         function pageCond() {
2289                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2290         }
2291
2292         /**
2293          * Get the revision ID of the previous revision
2294          *
2295          * @param integer $revision  Revision ID. Get the revision that was before this one.
2296          * @return integer $oldrevision|false
2297          */
2298         function getPreviousRevisionID( $revision ) {
2299                 $dbr =& wfGetDB( DB_SLAVE );
2300                 return $dbr->selectField( 'revision', 'rev_id',
2301                         'rev_page=' . intval( $this->getArticleId() ) .
2302                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2303         }
2304
2305         /**
2306          * Get the revision ID of the next revision
2307          *
2308          * @param integer $revision  Revision ID. Get the revision that was after this one.
2309          * @return integer $oldrevision|false
2310          */
2311         function getNextRevisionID( $revision ) {
2312                 $dbr =& wfGetDB( DB_SLAVE );
2313                 return $dbr->selectField( 'revision', 'rev_id',
2314                         'rev_page=' . intval( $this->getArticleId() ) .
2315                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2316         }
2317
2318         /**
2319          * Get the number of revisions between the given revision IDs.
2320          *
2321          * @param integer $old  Revision ID.
2322          * @param integer $new  Revision ID.
2323          * @return integer  Number of revisions between these IDs.
2324          */
2325         function countRevisionsBetween( $old, $new ) {
2326                 $dbr =& wfGetDB( DB_SLAVE );
2327                 return $dbr->selectField( 'revision', 'count(*)',
2328                         'rev_page = ' . intval( $this->getArticleId() ) .
2329                         ' AND rev_id > ' . intval( $old ) .
2330                         ' AND rev_id < ' . intval( $new ) );
2331         }
2332
2333         /**
2334          * Compare with another title.
2335          *
2336          * @param Title $title
2337          * @return bool
2338          */
2339         function equals( $title ) {
2340                 // Note: === is necessary for proper matching of number-like titles.
2341                 return $this->getInterwiki() === $title->getInterwiki()
2342                         && $this->getNamespace() == $title->getNamespace()
2343                         && $this->getDbkey() === $title->getDbkey();
2344         }
2345
2346         /**
2347          * Check if page exists
2348          * @return bool
2349          */
2350         function exists() {
2351                 return $this->getArticleId() != 0;
2352         }
2353
2354         /**
2355          * Should a link should be displayed as a known link, just based on its title?
2356          *
2357          * Currently, a self-link with a fragment and special pages are in
2358          * this category. Special pages never exist in the database.
2359          */
2360         function isAlwaysKnown() {
2361                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2362                   || NS_SPECIAL == $this->mNamespace;
2363         }
2364
2365         /**
2366          * Update page_touched timestamps and send squid purge messages for
2367          * pages linking to this title. May be sent to the job queue depending
2368          * on the number of links. Typically called on create and delete.
2369          */
2370         function touchLinks() {
2371                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2372                 $u->doUpdate();
2373
2374                 if ( $this->getNamespace() == NS_CATEGORY ) {
2375                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2376                         $u->doUpdate();
2377                 }
2378         }
2379
2380         /**
2381          * Get the last touched timestamp
2382          */
2383         function getTouched() {
2384                 $dbr =& wfGetDB( DB_SLAVE );
2385                 $touched = $dbr->selectField( 'page', 'page_touched',
2386                         array(
2387                                 'page_namespace' => $this->getNamespace(),
2388                                 'page_title' => $this->getDBkey()
2389                         ), __METHOD__
2390                 );
2391                 return $touched;
2392         }
2393
2394         /**
2395          * Get a cached value from a global cache that is invalidated when this page changes
2396          * @param string $key the key
2397          * @param callback $callback A callback function which generates the value on cache miss
2398          *
2399          * @deprecated use DependencyWrapper
2400          */
2401         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2402                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2403                         $params, new TitleDependency( $this ) );
2404         }
2405
2406         function trackbackURL() {
2407                 global $wgTitle, $wgScriptPath, $wgServer;
2408
2409                 return "$wgServer$wgScriptPath/trackback.php?article="
2410                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2411         }
2412
2413         function trackbackRDF() {
2414                 $url = htmlspecialchars($this->getFullURL());
2415                 $title = htmlspecialchars($this->getText());
2416                 $tburl = $this->trackbackURL();
2417
2418                 return "
2419 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2420          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2421          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2422 <rdf:Description
2423    rdf:about=\"$url\"
2424    dc:identifier=\"$url\"
2425    dc:title=\"$title\"
2426    trackback:ping=\"$tburl\" />
2427 </rdf:RDF>";
2428         }
2429
2430         /**
2431          * Generate strings used for xml 'id' names in monobook tabs
2432          * @return string
2433          */
2434         function getNamespaceKey() {
2435                 global $wgContLang;
2436                 switch ($this->getNamespace()) {
2437                         case NS_MAIN:
2438                         case NS_TALK:
2439                                 return 'nstab-main';
2440                         case NS_USER:
2441                         case NS_USER_TALK:
2442                                 return 'nstab-user';
2443                         case NS_MEDIA:
2444                                 return 'nstab-media';
2445                         case NS_SPECIAL:
2446                                 return 'nstab-special';
2447                         case NS_PROJECT:
2448                         case NS_PROJECT_TALK:
2449                                 return 'nstab-project';
2450                         case NS_IMAGE:
2451                         case NS_IMAGE_TALK:
2452                                 return 'nstab-image';
2453                         case NS_MEDIAWIKI:
2454                         case NS_MEDIAWIKI_TALK:
2455                                 return 'nstab-mediawiki';
2456                         case NS_TEMPLATE:
2457                         case NS_TEMPLATE_TALK:
2458                                 return 'nstab-template';
2459                         case NS_HELP:
2460                         case NS_HELP_TALK:
2461                                 return 'nstab-help';
2462                         case NS_CATEGORY:
2463                         case NS_CATEGORY_TALK:
2464                                 return 'nstab-category';
2465                         default:
2466                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2467                 }
2468         }
2469
2470         /**
2471          * Returns true if this title resolves to the named special page
2472          * @param string $name The special page name
2473          * @access public
2474          */
2475         function isSpecial( $name ) {
2476                 if ( $this->getNamespace() == NS_SPECIAL ) {
2477                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2478                         if ( $name == $thisName ) {
2479                                 return true;
2480                         }
2481                 }
2482                 return false;
2483         }
2484
2485         /**
2486          * If the Title refers to a special page alias which is not the local default,
2487          * returns a new Title which points to the local default. Otherwise, returns $this.
2488          */
2489         function fixSpecialName() {
2490                 if ( $this->getNamespace() == NS_SPECIAL ) {
2491                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2492                         if ( $canonicalName ) {
2493                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2494                                 if ( $localName != $this->mDbkeyform ) {
2495                                         return Title::makeTitle( NS_SPECIAL, $localName );
2496                                 }
2497                         }
2498                 }
2499                 return $this;
2500         }
2501
2502         /**
2503          * Is this Title in a namespace which contains content?
2504          * In other words, is this a content page, for the purposes of calculating
2505          * statistics, etc?
2506          *
2507          * @return bool
2508          */
2509         public function isContentPage() {
2510                 return Namespace::isContent( $this->getNamespace() );
2511         }
2512
2513 }
2514
2515 ?>