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 # Constants for pr_cascade bitfield
  21 define( 'CASCADE', 1 );
  22
  23 /**
  24  * Title class
  25  * - Represents a title, which may contain an interwiki designation or namespace
  26  * - Can fetch various kinds of data from the database, albeit inefficiently.
  27  *
  28  * @package MediaWiki
  29  */
  30 class Title {
  31         /**
  32          * Static cache variables
  33          */
  34         static private $titleCache=array();
  35         static private $interwikiCache=array();
  36
  37
  38         /**
  39          * All member variables should be considered private
  40          * Please use the accessor functions
  41          */
  42
  43          /**#@+
  44          * @private
  45          */
  46
  47         var $mTextform;           # Text form (spaces not underscores) of the main part
  48         var $mUrlform;            # URL-encoded form of the main part
  49         var $mDbkeyform;          # Main part with underscores
  50         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  51         var $mInterwiki;          # Interwiki prefix (or null string)
  52         var $mFragment;           # Title fragment (i.e. the bit after the #)
  53         var $mArticleID;          # Article ID, fetched from the link cache on demand
  54         var $mLatestID;         # ID of most recent revision
  55         var $mRestrictions;       # Array of groups allowed to edit this article
  56         var $mCascadeRestriction;
  57         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  58         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  59         var $mDefaultNamespace;   # Namespace index when there is no namespace
  60                             # Zero except in {{transclusion}} tags
  61         var $mWatched;      # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  62         /**#@-*/
  63
  64
  65         /**
  66          * Constructor
  67          * @private
  68          */
  69         /* private */ function Title() {
  70                 $this->mInterwiki = $this->mUrlform =
  71                 $this->mTextform = $this->mDbkeyform = '';
  72                 $this->mArticleID = -1;
  73                 $this->mNamespace = NS_MAIN;
  74                 $this->mRestrictionsLoaded = false;
  75                 $this->mRestrictions = array();
  76                 # Dont change the following, NS_MAIN is hardcoded in several place
  77                 # See bug #696
  78                 $this->mDefaultNamespace = NS_MAIN;
  79                 $this->mWatched = NULL;
  80                 $this->mLatestID = false;
  81         }
  82
  83         /**
  84          * Create a new Title from a prefixed DB key
  85          * @param string $key The database key, which has underscores
  86          *      instead of spaces, possibly including namespace and
  87          *      interwiki prefixes
  88          * @return Title the new object, or NULL on an error
  89          * @static
  90          * @access public
  91          */
  92         /* static */ function newFromDBkey( $key ) {
  93                 $t = new Title();
  94                 $t->mDbkeyform = $key;
  95                 if( $t->secureAndSplit() )
  96                         return $t;
  97                 else
  98                         return NULL;
  99         }
 100
 101         /**
 102          * Create a new Title from text, such as what one would
 103          * find in a link. Decodes any HTML entities in the text.
 104          *
 105          * @param string $text the link text; spaces, prefixes,
 106          *      and an initial ':' indicating the main namespace
 107          *      are accepted
 108          * @param int $defaultNamespace the namespace to use if
 109          *      none is specified by a prefix
 110          * @return Title the new object, or NULL on an error
 111          * @static
 112          * @access public
 113          */
 114         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 115                 if( is_object( $text ) ) {
 116                         throw new MWException( 'Title::newFromText given an object' );
 117                 }
 118
 119                 /**
 120                  * Wiki pages often contain multiple links to the same page.
 121                  * Title normalization and parsing can become expensive on
 122                  * pages with many links, so we can save a little time by
 123                  * caching them.
 124                  *
 125                  * In theory these are value objects and won't get changed...
 126                  */
 127                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 128                         return Title::$titleCache[$text];
 129                 }
 130
 131                 /**
 132                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 133                  */
 134                 $filteredText = Sanitizer::decodeCharReferences( $text );
 135
 136                 $t = new Title();
 137                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 138                 $t->mDefaultNamespace = $defaultNamespace;
 139
 140                 static $cachedcount = 0 ;
 141                 if( $t->secureAndSplit() ) {
 142                         if( $defaultNamespace == NS_MAIN ) {
 143                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 144                                         # Avoid memory leaks on mass operations...
 145                                         Title::$titleCache = array();
 146                                         $cachedcount=0;
 147                                 }
 148                                 $cachedcount++;
 149                                 Title::$titleCache[$text] =& $t;
 150                         }
 151                         return $t;
 152                 } else {
 153                         $ret = NULL;
 154                         return $ret;
 155                 }
 156         }
 157
 158         /**
 159          * Create a new Title from URL-encoded text. Ensures that
 160          * the given title's length does not exceed the maximum.
 161          * @param string $url the title, as might be taken from a URL
 162          * @return Title the new object, or NULL on an error
 163          * @static
 164          * @access public
 165          */
 166         public static function newFromURL( $url ) {
 167                 global $wgLegalTitleChars;
 168                 $t = new Title();
 169
 170                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 171                 # but some URLs used it as a space replacement and they still come
 172                 # from some external search tools.
 173                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 174                         $url = str_replace( '+', ' ', $url );
 175                 }
 176
 177                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 178                 if( $t->secureAndSplit() ) {
 179                         return $t;
 180                 } else {
 181                         return NULL;
 182                 }
 183         }
 184
 185         /**
 186          * Create a new Title from an article ID
 187          *
 188          * @todo This is inefficiently implemented, the page row is requested
 189          *       but not used for anything else
 190          *
 191          * @param int $id the page_id corresponding to the Title to create
 192          * @return Title the new object, or NULL on an error
 193          * @access public
 194          * @static
 195          */
 196         public static function newFromID( $id ) {
 197                 $fname = 'Title::newFromID';
 198                 $dbr =& wfGetDB( DB_SLAVE );
 199                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 200                         array( 'page_id' => $id ), $fname );
 201                 if ( $row !== false ) {
 202                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 203                 } else {
 204                         $title = NULL;
 205                 }
 206                 return $title;
 207         }
 208
 209         /**
 210          * Make an array of titles from an array of IDs
 211          */
 212         function newFromIDs( $ids ) {
 213                 $dbr =& wfGetDB( DB_SLAVE );
 214                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 215                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 216
 217                 $titles = array();
 218                 while ( $row = $dbr->fetchObject( $res ) ) {
 219                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 220                 }
 221                 return $titles;
 222         }
 223
 224         /**
 225          * Create a new Title from a namespace index and a DB key.
 226          * It's assumed that $ns and $title are *valid*, for instance when
 227          * they came directly from the database or a special page name.
 228          * For convenience, spaces are converted to underscores so that
 229          * eg user_text fields can be used directly.
 230          *
 231          * @param int $ns the namespace of the article
 232          * @param string $title the unprefixed database key form
 233          * @return Title the new object
 234          * @static
 235          * @access public
 236          */
 237         public static function &makeTitle( $ns, $title ) {
 238                 $t = new Title();
 239                 $t->mInterwiki = '';
 240                 $t->mFragment = '';
 241                 $t->mNamespace = intval( $ns );
 242                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 243                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 244                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 245                 $t->mTextform = str_replace( '_', ' ', $title );
 246                 return $t;
 247         }
 248
 249         /**
 250          * Create a new Title from a namespace index and a DB key.
 251          * The parameters will be checked for validity, which is a bit slower
 252          * than makeTitle() but safer for user-provided data.
 253          *
 254          * @param int $ns the namespace of the article
 255          * @param string $title the database key form
 256          * @return Title the new object, or NULL on an error
 257          * @static
 258          * @access public
 259          */
 260         public static function makeTitleSafe( $ns, $title ) {
 261                 $t = new Title();
 262                 $t->mDbkeyform = Title::makeName( $ns, $title );
 263                 if( $t->secureAndSplit() ) {
 264                         return $t;
 265                 } else {
 266                         return NULL;
 267                 }
 268         }
 269
 270         /**
 271          * Create a new Title for the Main Page
 272          *
 273          * @static
 274          * @return Title the new object
 275          * @access public
 276          */
 277         public static function newMainPage() {
 278                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 279         }
 280
 281         /**
 282          * Create a new Title for a redirect
 283          * @param string $text the redirect title text
 284          * @return Title the new object, or NULL if the text is not a
 285          *      valid redirect
 286          */
 287         public static function newFromRedirect( $text ) {
 288                 $mwRedir = MagicWord::get( 'redirect' );
 289                 $rt = NULL;
 290                 if ( $mwRedir->matchStart( $text ) ) {
 291                         $m = array();
 292                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 293                                 # categories are escaped using : for example one can enter:
 294                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 295                                 if ( substr($m[1],0,1) == ':') {
 296                                         # We don't want to keep the ':'
 297                                         $m[1] = substr( $m[1], 1 );
 298                                 }
 299
 300                                 $rt = Title::newFromText( $m[1] );
 301                                 # Disallow redirects to Special:Userlogout
 302                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 303                                         $rt = NULL;
 304                                 }
 305                         }
 306                 }
 307                 return $rt;
 308         }
 309
 310 #----------------------------------------------------------------------------
 311 #       Static functions
 312 #----------------------------------------------------------------------------
 313
 314         /**
 315          * Get the prefixed DB key associated with an ID
 316          * @param int $id the page_id of the article
 317          * @return Title an object representing the article, or NULL
 318          *      if no such article was found
 319          * @static
 320          * @access public
 321          */
 322         function nameOf( $id ) {
 323                 $fname = 'Title::nameOf';
 324                 $dbr =& wfGetDB( DB_SLAVE );
 325
 326                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 327                 if ( $s === false ) { return NULL; }
 328
 329                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 330                 return $n;
 331         }
 332
 333         /**
 334          * Get a regex character class describing the legal characters in a link
 335          * @return string the list of characters, not delimited
 336          * @static
 337          * @access public
 338          */
 339         public static function legalChars() {
 340                 global $wgLegalTitleChars;
 341                 return $wgLegalTitleChars;
 342         }
 343
 344         /**
 345          * Get a string representation of a title suitable for
 346          * including in a search index
 347          *
 348          * @param int $ns a namespace index
 349          * @param string $title text-form main part
 350          * @return string a stripped-down title string ready for the
 351          *      search index
 352          */
 353         public static function indexTitle( $ns, $title ) {
 354                 global $wgContLang;
 355
 356                 $lc = SearchEngine::legalSearchChars() . '&#;';
 357                 $t = $wgContLang->stripForSearch( $title );
 358                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 359                 $t = $wgContLang->lc( $t );
 360
 361                 # Handle 's, s'
 362                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 363                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 364
 365                 $t = preg_replace( "/\\s+/", ' ', $t );
 366
 367                 if ( $ns == NS_IMAGE ) {
 368                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 369                 }
 370                 return trim( $t );
 371         }
 372
 373         /*
 374          * Make a prefixed DB key from a DB key and a namespace index
 375          * @param int $ns numerical representation of the namespace
 376          * @param string $title the DB key form the title
 377          * @return string the prefixed form of the title
 378          */
 379         public static function makeName( $ns, $title ) {
 380                 global $wgContLang;
 381
 382                 $n = $wgContLang->getNsText( $ns );
 383                 return $n == '' ? $title : "$n:$title";
 384         }
 385
 386         /**
 387          * Returns the URL associated with an interwiki prefix
 388          * @param string $key the interwiki prefix (e.g. "MeatBall")
 389          * @return the associated URL, containing "$1", which should be
 390          *      replaced by an article title
 391          * @static (arguably)
 392          * @access public
 393          */
 394         function getInterwikiLink( $key )  {
 395                 global $wgMemc, $wgInterwikiExpiry;
 396                 global $wgInterwikiCache, $wgContLang;
 397                 $fname = 'Title::getInterwikiLink';
 398
 399                 $key = $wgContLang->lc( $key );
 400
 401                 $k = wfMemcKey( 'interwiki', $key );
 402                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 403                         return Title::$interwikiCache[$k]->iw_url;
 404                 }
 405
 406                 if ($wgInterwikiCache) {
 407                         return Title::getInterwikiCached( $key );
 408                 }
 409
 410                 $s = $wgMemc->get( $k );
 411                 # Ignore old keys with no iw_local
 412                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 413                         Title::$interwikiCache[$k] = $s;
 414                         return $s->iw_url;
 415                 }
 416
 417                 $dbr =& wfGetDB( DB_SLAVE );
 418                 $res = $dbr->select( 'interwiki',
 419                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 420                         array( 'iw_prefix' => $key ), $fname );
 421                 if( !$res ) {
 422                         return '';
 423                 }
 424
 425                 $s = $dbr->fetchObject( $res );
 426                 if( !$s ) {
 427                         # Cache non-existence: create a blank object and save it to memcached
 428                         $s = (object)false;
 429                         $s->iw_url = '';
 430                         $s->iw_local = 0;
 431                         $s->iw_trans = 0;
 432                 }
 433                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 434                 Title::$interwikiCache[$k] = $s;
 435
 436                 return $s->iw_url;
 437         }
 438
 439         /**
 440          * Fetch interwiki prefix data from local cache in constant database
 441          *
 442          * More logic is explained in DefaultSettings
 443          *
 444          * @return string URL of interwiki site
 445          * @access public
 446          */
 447         function getInterwikiCached( $key ) {
 448                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 449                 static $db, $site;
 450
 451                 if (!$db)
 452                         $db=dba_open($wgInterwikiCache,'r','cdb');
 453                 /* Resolve site name */
 454                 if ($wgInterwikiScopes>=3 and !$site) {
 455                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 456                         if ($site=="")
 457                                 $site = $wgInterwikiFallbackSite;
 458                 }
 459                 $value = dba_fetch( wfMemcKey( $key ), $db);
 460                 if ($value=='' and $wgInterwikiScopes>=3) {
 461                         /* try site-level */
 462                         $value = dba_fetch("_{$site}:{$key}", $db);
 463                 }
 464                 if ($value=='' and $wgInterwikiScopes>=2) {
 465                         /* try globals */
 466                         $value = dba_fetch("__global:{$key}", $db);
 467                 }
 468                 if ($value=='undef')
 469                         $value='';
 470                 $s = (object)false;
 471                 $s->iw_url = '';
 472                 $s->iw_local = 0;
 473                 $s->iw_trans = 0;
 474                 if ($value!='') {
 475                         list($local,$url)=explode(' ',$value,2);
 476                         $s->iw_url=$url;
 477                         $s->iw_local=(int)$local;
 478                 }
 479                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 480                 return $s->iw_url;
 481         }
 482         /**
 483          * Determine whether the object refers to a page within
 484          * this project.
 485          *
 486          * @return bool TRUE if this is an in-project interwiki link
 487          *      or a wikilink, FALSE otherwise
 488          * @access public
 489          */
 490         function isLocal() {
 491                 if ( $this->mInterwiki != '' ) {
 492                         # Make sure key is loaded into cache
 493                         $this->getInterwikiLink( $this->mInterwiki );
 494                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 495                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 496                 } else {
 497                         return true;
 498                 }
 499         }
 500
 501         /**
 502          * Determine whether the object refers to a page within
 503          * this project and is transcludable.
 504          *
 505          * @return bool TRUE if this is transcludable
 506          * @access public
 507          */
 508         function isTrans() {
 509                 if ($this->mInterwiki == '')
 510                         return false;
 511                 # Make sure key is loaded into cache
 512                 $this->getInterwikiLink( $this->mInterwiki );
 513                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 514                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 515         }
 516
 517         /**
 518          * Update the page_touched field for an array of title objects
 519          * @todo Inefficient unless the IDs are already loaded into the
 520          *      link cache
 521          * @param array $titles an array of Title objects to be touched
 522          * @param string $timestamp the timestamp to use instead of the
 523          *      default current time
 524          * @static
 525          * @access public
 526          */
 527         function touchArray( $titles, $timestamp = '' ) {
 528
 529                 if ( count( $titles ) == 0 ) {
 530                         return;
 531                 }
 532                 $dbw =& wfGetDB( DB_MASTER );
 533                 if ( $timestamp == '' ) {
 534                         $timestamp = $dbw->timestamp();
 535                 }
 536                 /*
 537                 $page = $dbw->tableName( 'page' );
 538                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 539                 $first = true;
 540
 541                 foreach ( $titles as $title ) {
 542                         if ( $wgUseFileCache ) {
 543                                 $cm = new HTMLFileCache($title);
 544                                 @unlink($cm->fileCacheName());
 545                         }
 546
 547                         if ( ! $first ) {
 548                                 $sql .= ',';
 549                         }
 550                         $first = false;
 551                         $sql .= $title->getArticleID();
 552                 }
 553                 $sql .= ')';
 554                 if ( ! $first ) {
 555                         $dbw->query( $sql, 'Title::touchArray' );
 556                 }
 557                 */
 558                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 559                 // do them in small chunks:
 560                 $fname = 'Title::touchArray';
 561                 foreach( $titles as $title ) {
 562                         $dbw->update( 'page',
 563                                 array( 'page_touched' => $timestamp ),
 564                                 array(
 565                                         'page_namespace' => $title->getNamespace(),
 566                                         'page_title'     => $title->getDBkey() ),
 567                                 $fname );
 568                 }
 569         }
 570
 571         /**
 572          * Escape a text fragment, say from a link, for a URL
 573          */
 574         static function escapeFragmentForURL( $fragment ) {
 575                 $fragment = str_replace( ' ', '_', $fragment );
 576                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 577                 $replaceArray = array(
 578                         '%3A' => ':',
 579                         '%' => '.'
 580                 );
 581                 return strtr( $fragment, $replaceArray );
 582         }
 583
 584 #----------------------------------------------------------------------------
 585 #       Other stuff
 586 #----------------------------------------------------------------------------
 587
 588         /** Simple accessors */
 589         /**
 590          * Get the text form (spaces not underscores) of the main part
 591          * @return string
 592          * @access public
 593          */
 594         function getText() { return $this->mTextform; }
 595         /**
 596          * Get the URL-encoded form of the main part
 597          * @return string
 598          * @access public
 599          */
 600         function getPartialURL() { return $this->mUrlform; }
 601         /**
 602          * Get the main part with underscores
 603          * @return string
 604          * @access public
 605          */
 606         function getDBkey() { return $this->mDbkeyform; }
 607         /**
 608          * Get the namespace index, i.e. one of the NS_xxxx constants
 609          * @return int
 610          * @access public
 611          */
 612         function getNamespace() { return $this->mNamespace; }
 613         /**
 614          * Get the namespace text
 615          * @return string
 616          * @access public
 617          */
 618         function getNsText() {
 619                 global $wgContLang, $wgCanonicalNamespaceNames;
 620
 621                 if ( '' != $this->mInterwiki ) {
 622                         // This probably shouldn't even happen. ohh man, oh yuck.
 623                         // But for interwiki transclusion it sometimes does.
 624                         // Shit. Shit shit shit.
 625                         //
 626                         // Use the canonical namespaces if possible to try to
 627                         // resolve a foreign namespace.
 628                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 629                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 630                         }
 631                 }
 632                 return $wgContLang->getNsText( $this->mNamespace );
 633         }
 634         /**
 635          * Get the namespace text of the subject (rather than talk) page
 636          * @return string
 637          * @access public
 638          */
 639         function getSubjectNsText() {
 640                 global $wgContLang;
 641                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 642         }
 643
 644         /**
 645          * Get the namespace text of the talk page
 646          * @return string
 647          */
 648         function getTalkNsText() {
 649                 global $wgContLang;
 650                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 651         }
 652
 653         /**
 654          * Could this title have a corresponding talk page?
 655          * @return bool
 656          */
 657         function canTalk() {
 658                 return( Namespace::canTalk( $this->mNamespace ) );
 659         }
 660
 661         /**
 662          * Get the interwiki prefix (or null string)
 663          * @return string
 664          * @access public
 665          */
 666         function getInterwiki() { return $this->mInterwiki; }
 667         /**
 668          * Get the Title fragment (i.e. the bit after the #) in text form
 669          * @return string
 670          * @access public
 671          */
 672         function getFragment() { return $this->mFragment; }
 673         /**
 674          * Get the fragment in URL form, including the "#" character if there is one
 675          *
 676          * @return string
 677          * @access public
 678          */
 679         function getFragmentForURL() {
 680                 if ( $this->mFragment == '' ) {
 681                         return '';
 682                 } else {
 683                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 684                 }
 685         }
 686         /**
 687          * Get the default namespace index, for when there is no namespace
 688          * @return int
 689          * @access public
 690          */
 691         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 692
 693         /**
 694          * Get title for search index
 695          * @return string a stripped-down title string ready for the
 696          *      search index
 697          */
 698         function getIndexTitle() {
 699                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 700         }
 701
 702         /**
 703          * Get the prefixed database key form
 704          * @return string the prefixed title, with underscores and
 705          *      any interwiki and namespace prefixes
 706          * @access public
 707          */
 708         function getPrefixedDBkey() {
 709                 $s = $this->prefix( $this->mDbkeyform );
 710                 $s = str_replace( ' ', '_', $s );
 711                 return $s;
 712         }
 713
 714         /**
 715          * Get the prefixed title with spaces.
 716          * This is the form usually used for display
 717          * @return string the prefixed title, with spaces
 718          * @access public
 719          */
 720         function getPrefixedText() {
 721                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 722                         $s = $this->prefix( $this->mTextform );
 723                         $s = str_replace( '_', ' ', $s );
 724                         $this->mPrefixedText = $s;
 725                 }
 726                 return $this->mPrefixedText;
 727         }
 728
 729         /**
 730          * Get the prefixed title with spaces, plus any fragment
 731          * (part beginning with '#')
 732          * @return string the prefixed title, with spaces and
 733          *      the fragment, including '#'
 734          * @access public
 735          */
 736         function getFullText() {
 737                 $text = $this->getPrefixedText();
 738                 if( '' != $this->mFragment ) {
 739                         $text .= '#' . $this->mFragment;
 740                 }
 741                 return $text;
 742         }
 743
 744         /**
 745          * Get the base name, i.e. the leftmost parts before the /
 746          * @return string Base name
 747          */
 748         function getBaseText() {
 749                 global $wgNamespacesWithSubpages;
 750                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 751                         $parts = explode( '/', $this->getText() );
 752                         # Don't discard the real title if there's no subpage involved
 753                         if( count( $parts ) > 1 )
 754                                 unset( $parts[ count( $parts ) - 1 ] );
 755                         return implode( '/', $parts );
 756                 } else {
 757                         return $this->getText();
 758                 }
 759         }
 760
 761         /**
 762          * Get the lowest-level subpage name, i.e. the rightmost part after /
 763          * @return string Subpage name
 764          */
 765         function getSubpageText() {
 766                 global $wgNamespacesWithSubpages;
 767                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 768                         $parts = explode( '/', $this->mTextform );
 769                         return( $parts[ count( $parts ) - 1 ] );
 770                 } else {
 771                         return( $this->mTextform );
 772                 }
 773         }
 774
 775         /**
 776          * Get a URL-encoded form of the subpage text
 777          * @return string URL-encoded subpage name
 778          */
 779         function getSubpageUrlForm() {
 780                 $text = $this->getSubpageText();
 781                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 782                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 783                 return( $text );
 784         }
 785
 786         /**
 787          * Get a URL-encoded title (not an actual URL) including interwiki
 788          * @return string the URL-encoded form
 789          * @access public
 790          */
 791         function getPrefixedURL() {
 792                 $s = $this->prefix( $this->mDbkeyform );
 793                 $s = str_replace( ' ', '_', $s );
 794
 795                 $s = wfUrlencode ( $s ) ;
 796
 797                 # Cleaning up URL to make it look nice -- is this safe?
 798                 $s = str_replace( '%28', '(', $s );
 799                 $s = str_replace( '%29', ')', $s );
 800
 801                 return $s;
 802         }
 803
 804         /**
 805          * Get a real URL referring to this title, with interwiki link and
 806          * fragment
 807          *
 808          * @param string $query an optional query string, not used
 809          *      for interwiki links
 810          * @param string $variant language variant of url (for sr, zh..)
 811          * @return string the URL
 812          * @access public
 813          */
 814         function getFullURL( $query = '', $variant = false ) {
 815                 global $wgContLang, $wgServer, $wgRequest;
 816
 817                 if ( '' == $this->mInterwiki ) {
 818                         $url = $this->getLocalUrl( $query, $variant );
 819
 820                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 821                         // Correct fix would be to move the prepending elsewhere.
 822                         if ($wgRequest->getVal('action') != 'render') {
 823                                 $url = $wgServer . $url;
 824                         }
 825                 } else {
 826                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 827
 828                         $namespace = wfUrlencode( $this->getNsText() );
 829                         if ( '' != $namespace ) {
 830                                 # Can this actually happen? Interwikis shouldn't be parsed.
 831                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 832                                 $namespace .= ':';
 833                         }
 834                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 835                         if( $query != '' ) {
 836                                 if( false === strpos( $url, '?' ) ) {
 837                                         $url .= '?';
 838                                 } else {
 839                                         $url .= '&';
 840                                 }
 841                                 $url .= $query;
 842                         }
 843                 }
 844
 845                 # Finally, add the fragment.
 846                 $url .= $this->getFragmentForURL();
 847
 848                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 849                 return $url;
 850         }
 851
 852         /**
 853          * Get a URL with no fragment or server name.  If this page is generated
 854          * with action=render, $wgServer is prepended.
 855          * @param string $query an optional query string; if not specified,
 856          *      $wgArticlePath will be used.
 857          * @param string $variant language variant of url (for sr, zh..)
 858          * @return string the URL
 859          * @access public
 860          */
 861         function getLocalURL( $query = '', $variant = false ) {
 862                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 863                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 864
 865                 // internal links should point to same variant as current page (only anonymous users)
 866                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 867                         $pref = $wgContLang->getPreferredVariant(false);
 868                         if($pref != $wgContLang->getCode())
 869                                 $variant = $pref;
 870                 }
 871
 872                 if ( $this->isExternal() ) {
 873                         $url = $this->getFullURL();
 874                         if ( $query ) {
 875                                 // This is currently only used for edit section links in the
 876                                 // context of interwiki transclusion. In theory we should
 877                                 // append the query to the end of any existing query string,
 878                                 // but interwiki transclusion is already broken in that case.
 879                                 $url .= "?$query";
 880                         }
 881                 } else {
 882                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 883                         if ( $query == '' ) {
 884                                 if($variant!=false && $wgContLang->hasVariants()){
 885                                         if($wgVariantArticlePath==false)
 886                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 887                                         else
 888                                                 $variantArticlePath = $wgVariantArticlePath;
 889
 890                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 891                                         $url = str_replace( '$1', $dbkey, $url  );
 892
 893                                 }
 894                                 else
 895                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 896                         } else {
 897                                 global $wgActionPaths;
 898                                 $url = false;
 899                                 $matches = array();
 900                                 if( !empty( $wgActionPaths ) &&
 901                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 902                                 {
 903                                         $action = urldecode( $matches[2] );
 904                                         if( isset( $wgActionPaths[$action] ) ) {
 905                                                 $query = $matches[1];
 906                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 907                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 908                                                 if( $query != '' ) $url .= '?' . $query;
 909                                         }
 910                                 }
 911                                 if ( $url === false ) {
 912                                         if ( $query == '-' ) {
 913                                                 $query = '';
 914                                         }
 915                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 916                                 }
 917                         }
 918
 919                         // FIXME: this causes breakage in various places when we
 920                         // actually expected a local URL and end up with dupe prefixes.
 921                         if ($wgRequest->getVal('action') == 'render') {
 922                                 $url = $wgServer . $url;
 923                         }
 924                 }
 925                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 926                 return $url;
 927         }
 928
 929         /**
 930          * Get an HTML-escaped version of the URL form, suitable for
 931          * using in a link, without a server name or fragment
 932          * @param string $query an optional query string
 933          * @return string the URL
 934          * @access public
 935          */
 936         function escapeLocalURL( $query = '' ) {
 937                 return htmlspecialchars( $this->getLocalURL( $query ) );
 938         }
 939
 940         /**
 941          * Get an HTML-escaped version of the URL form, suitable for
 942          * using in a link, including the server name and fragment
 943          *
 944          * @return string the URL
 945          * @param string $query an optional query string
 946          * @access public
 947          */
 948         function escapeFullURL( $query = '' ) {
 949                 return htmlspecialchars( $this->getFullURL( $query ) );
 950         }
 951
 952         /**
 953          * Get the URL form for an internal link.
 954          * - Used in various Squid-related code, in case we have a different
 955          * internal hostname for the server from the exposed one.
 956          *
 957          * @param string $query an optional query string
 958          * @param string $variant language variant of url (for sr, zh..)
 959          * @return string the URL
 960          * @access public
 961          */
 962         function getInternalURL( $query = '', $variant = false ) {
 963                 global $wgInternalServer;
 964                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 965                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 966                 return $url;
 967         }
 968
 969         /**
 970          * Get the edit URL for this Title
 971          * @return string the URL, or a null string if this is an
 972          *      interwiki link
 973          * @access public
 974          */
 975         function getEditURL() {
 976                 if ( '' != $this->mInterwiki ) { return ''; }
 977                 $s = $this->getLocalURL( 'action=edit' );
 978
 979                 return $s;
 980         }
 981
 982         /**
 983          * Get the HTML-escaped displayable text form.
 984          * Used for the title field in <a> tags.
 985          * @return string the text, including any prefixes
 986          * @access public
 987          */
 988         function getEscapedText() {
 989                 return htmlspecialchars( $this->getPrefixedText() );
 990         }
 991
 992         /**
 993          * Is this Title interwiki?
 994          * @return boolean
 995          * @access public
 996          */
 997         function isExternal() { return ( '' != $this->mInterwiki ); }
 998
 999         /**
1000          * Is this page "semi-protected" - the *only* protection is autoconfirm?
1001          *
1002          * @param string Action to check (default: edit)
1003          * @return bool
1004          */
1005         function isSemiProtected( $action = 'edit' ) {
1006                 if( $this->exists() ) {
1007                         $restrictions = $this->getRestrictions( $action );
1008                         if( count( $restrictions ) > 0 ) {
1009                                 foreach( $restrictions as $restriction ) {
1010                                         if( strtolower( $restriction ) != 'autoconfirmed' )
1011                                                 return false;
1012                                 }
1013                         } else {
1014                                 # Not protected
1015                                 return false;
1016                         }
1017                         return true;
1018                 } else {
1019                         # If it doesn't exist, it can't be protected
1020                         return false;
1021                 }
1022         }
1023
1024         /**
1025          * Does the title correspond to a protected article?
1026          * @param string $what the action the page is protected from,
1027          *      by default checks move and edit
1028          * @return boolean
1029          * @access public
1030          */
1031         function isProtected( $action = '' ) {
1032                 global $wgRestrictionLevels;
1033                 if ( NS_SPECIAL == $this->mNamespace ) { return true; }
1034
1035                 if( $action == 'edit' || $action == '' ) {
1036                         $r = $this->getRestrictions( 'edit' );
1037                         foreach( $wgRestrictionLevels as $level ) {
1038                                 if( in_array( $level, $r ) && $level != '' ) {
1039                                         return( true );
1040                                 }
1041                         }
1042                 }
1043
1044                 if( $action == 'move' || $action == '' ) {
1045                         $r = $this->getRestrictions( 'move' );
1046                         foreach( $wgRestrictionLevels as $level ) {
1047                                 if( in_array( $level, $r ) && $level != '' ) {
1048                                         return( true );
1049                                 }
1050                         }
1051                 }
1052
1053                 return false;
1054         }
1055
1056         /**
1057          * Is $wgUser is watching this page?
1058          * @return boolean
1059          * @access public
1060          */
1061         function userIsWatching() {
1062                 global $wgUser;
1063
1064                 if ( is_null( $this->mWatched ) ) {
1065                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1066                                 $this->mWatched = false;
1067                         } else {
1068                                 $this->mWatched = $wgUser->isWatched( $this );
1069                         }
1070                 }
1071                 return $this->mWatched;
1072         }
1073
1074         /**
1075          * Can $wgUser perform $action this page?
1076          * @param string $action action that permission needs to be checked for
1077          * @return boolean
1078          * @private
1079          */
1080         function userCan($action) {
1081                 $fname = 'Title::userCan';
1082                 wfProfileIn( $fname );
1083
1084                 global $wgUser, $wgNamespaceProtection;
1085
1086                 $result = null;
1087                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1088                 if ( $result !== null ) {
1089                         wfProfileOut( $fname );
1090                         return $result;
1091                 }
1092
1093                 if( NS_SPECIAL == $this->mNamespace ) {
1094                         wfProfileOut( $fname );
1095                         return false;
1096                 }
1097                 if ( array_key_exists( $this->mNamespace, $wgNamespaceProtection ) ) {
1098                         $nsProt = $wgNamespaceProtection[ $this->mNamespace ];
1099                         if ( !is_array($nsProt) ) $nsProt = array($nsProt);
1100                         foreach( $nsProt as $right ) {
1101                                 if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1102                                         wfProfileOut( $fname );
1103                                         return false;
1104                                 }
1105                         }
1106                 }
1107
1108                 if( $this->mDbkeyform == '_' ) {
1109                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1110                         wfProfileOut( $fname );
1111                         return false;
1112                 }
1113
1114                 # protect css/js subpages of user pages
1115                 # XXX: this might be better using restrictions
1116                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1117                 if( $this->isCssJsSubpage()
1118                         && !$wgUser->isAllowed('editinterface')
1119                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1120                         wfProfileOut( $fname );
1121                         return false;
1122                 }
1123
1124                 if ( ( $this->isCascadeProtectedPage() ) ||
1125                                 ($this->getNamespace() == NS_IMAGE && $this->isCascadeProtectedImage() ) ) {
1126                         # We /could/ use the protection level on the source page, but it's fairly ugly
1127                         #  as we have to establish a precedence hierarchy for pages included by multiple
1128                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1129                         #  as they could remove the protection anyway.
1130                         if ( !$wgUser->isAllowed('protect') ) {
1131                                 wfProfileOut( $fname );
1132                                 return false;
1133                         }
1134                 }
1135
1136                 foreach( $this->getRestrictions($action) as $right ) {
1137                         // Backwards compatibility, rewrite sysop -> protect
1138                         if ( $right == 'sysop' ) {
1139                                 $right = 'protect';
1140                         }
1141                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1142                                 wfProfileOut( $fname );
1143                                 return false;
1144                         }
1145                 }
1146
1147                 if( $action == 'move' &&
1148                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1149                         wfProfileOut( $fname );
1150                         return false;
1151                 }
1152
1153                 if( $action == 'create' ) {
1154                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1155                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1156                                 wfProfileOut( $fname );
1157                                 return false;
1158                         }
1159                 }
1160
1161                 wfProfileOut( $fname );
1162                 return true;
1163         }
1164
1165         /**
1166          * Can $wgUser edit this page?
1167          * @return boolean
1168          * @access public
1169          */
1170         function userCanEdit() {
1171                 return $this->userCan('edit');
1172         }
1173
1174         /**
1175          * Can $wgUser create this page?
1176          * @return boolean
1177          * @access public
1178          */
1179         function userCanCreate() {
1180                 return $this->userCan('create');
1181         }
1182
1183         /**
1184          * Can $wgUser move this page?
1185          * @return boolean
1186          * @access public
1187          */
1188         function userCanMove() {
1189                 return $this->userCan('move');
1190         }
1191
1192         /**
1193          * Would anybody with sufficient privileges be able to move this page?
1194          * Some pages just aren't movable.
1195          *
1196          * @return boolean
1197          * @access public
1198          */
1199         function isMovable() {
1200                 return Namespace::isMovable( $this->getNamespace() )
1201                         && $this->getInterwiki() == '';
1202         }
1203
1204         /**
1205          * Can $wgUser read this page?
1206          * @return boolean
1207          * @access public
1208          */
1209         function userCanRead() {
1210                 global $wgUser;
1211
1212                 $result = null;
1213                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1214                 if ( $result !== null ) {
1215                         return $result;
1216                 }
1217
1218                 if( $wgUser->isAllowed('read') ) {
1219                         return true;
1220                 } else {
1221                         global $wgWhitelistRead;
1222
1223                         /**
1224                          * Always grant access to the login page.
1225                          * Even anons need to be able to log in.
1226                         */
1227                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1228                                 return true;
1229                         }
1230
1231                         /** some pages are explicitly allowed */
1232                         $name = $this->getPrefixedText();
1233                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1234                                 return true;
1235                         }
1236
1237                         # Compatibility with old settings
1238                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1239                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1240                                         return true;
1241                                 }
1242                         }
1243                 }
1244                 return false;
1245         }
1246
1247         /**
1248          * Is this a talk page of some sort?
1249          * @return bool
1250          * @access public
1251          */
1252         function isTalkPage() {
1253                 return Namespace::isTalk( $this->getNamespace() );
1254         }
1255
1256         /**
1257          * Is this a subpage?
1258          * @return bool
1259          * @access public
1260          */
1261         function isSubpage() {
1262                 global $wgNamespacesWithSubpages;
1263
1264                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1265                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1266                 } else {
1267                         return false;
1268                 }
1269         }
1270
1271         /**
1272          * Is this a .css or .js subpage of a user page?
1273          * @return bool
1274          * @access public
1275          */
1276         function isCssJsSubpage() {
1277                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(css|js)$/", $this->mTextform ) );
1278         }
1279         /**
1280          * Is this a *valid* .css or .js subpage of a user page?
1281          * Check that the corresponding skin exists
1282          */
1283         function isValidCssJsSubpage() {
1284                 if ( $this->isCssJsSubpage() ) {
1285                         $skinNames = Skin::getSkinNames();
1286                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1287                 } else {
1288                         return false;
1289                 }
1290         }
1291         /**
1292          * Trim down a .css or .js subpage title to get the corresponding skin name
1293          */
1294         function getSkinFromCssJsSubpage() {
1295                 $subpage = explode( '/', $this->mTextform );
1296                 $subpage = $subpage[ count( $subpage ) - 1 ];
1297                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1298         }
1299         /**
1300          * Is this a .css subpage of a user page?
1301          * @return bool
1302          * @access public
1303          */
1304         function isCssSubpage() {
1305                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1306         }
1307         /**
1308          * Is this a .js subpage of a user page?
1309          * @return bool
1310          * @access public
1311          */
1312         function isJsSubpage() {
1313                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1314         }
1315         /**
1316          * Protect css/js subpages of user pages: can $wgUser edit
1317          * this page?
1318          *
1319          * @return boolean
1320          * @todo XXX: this might be better using restrictions
1321          * @access public
1322          */
1323         function userCanEditCssJsSubpage() {
1324                 global $wgUser;
1325                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1326         }
1327
1328         /**
1329         * Cascading protects: Check if the current image is protected due to a cascading restriction
1330         *
1331         * @return bool If the current page is protected due to a cascading restriction.
1332         * @access public
1333         */
1334         function isCascadeProtectedImage() {
1335                 global $wgEnableCascadingProtection;
1336                 if (!$wgEnableCascadingProtection)
1337                         return false;
1338
1339                 wfProfileIn(__METHOD__);
1340
1341                 $dbr =& wfGetDb( DB_SLAVE );
1342
1343                 $cols = array( 'il_to' );
1344                 $tables = array ('imagelinks', 'page_restrictions');
1345                 $where_clauses = array( 'il_to' => $this->getDBkey(), 'il_from=pr_page', 'pr_cascade' => 1 );
1346
1347                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__);
1348
1349                 if ($dbr->numRows($res)) {
1350                         wfProfileOut(__METHOD__);
1351                         return true;
1352                 } else {
1353                         wfProfileOut(__METHOD__);
1354                         return false;
1355                 }
1356         }
1357
1358         /**
1359         * Cascading protects: Check if the current page is protected due to a cascading restriction.
1360         *
1361         * @return bool if the current page is protected due to a cascading restriction
1362         * @access public
1363         */
1364         function isCascadeProtectedPage() {
1365                 global $wgEnableCascadingProtection;
1366                 if (!$wgEnableCascadingProtection)
1367                         return false;
1368
1369                 wfProfileIn(__METHOD__);
1370
1371                 $dbr =& wfGetDb( DB_SLAVE );
1372
1373                 $cols = array( 'tl_namespace', 'tl_title'/*, 'pr_level', 'pr_type'*/ );
1374                 $tables = array ('templatelinks', 'page_restrictions');
1375                 $where_clauses = array( 'tl_namespace' => $this->getNamespace(), 'tl_title' => $this->getDBkey(), 'tl_from=pr_page', 'pr_cascade' => 1 );
1376
1377                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__);
1378
1379                 if ($dbr->numRows($res)) {
1380                         wfProfileOut(__METHOD__);
1381                         return true;
1382                 } else {
1383                         wfProfileOut(__METHOD__);
1384                         return false;
1385                 }
1386         }
1387
1388         function areRestrictionsCascading() {
1389                 if (!$this->mRestrictionsLoaded) {
1390                         $this->loadRestrictions();
1391                 }
1392
1393                 return $this->mCascadeRestriction;
1394         }
1395
1396         /**
1397          * Loads a string into mRestrictions array
1398          * @param resource $res restrictions as an SQL result.
1399          * @access public
1400          */
1401         function loadRestrictionsFromRow( $res ) {
1402                 $dbr =& wfGetDb( DB_SLAVE );
1403
1404                 if (!$dbr->numRows( $res ) ) {
1405                         # No restrictions
1406                         $this->mRestrictionsLoaded = true;
1407                         return;
1408                 }
1409
1410                 $this->mRestrictions['edit'] = array();
1411                 $this->mRestrictions['move'] = array();
1412
1413                 while ($row = $dbr->fetchObject( $res ) ) {
1414                         # Cycle through all the restrictions.
1415
1416                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1417
1418                         $this->mCascadeRestriction |= $row->pr_cascade;
1419                 }
1420
1421                 $this->mRestrictionsLoaded = true;
1422         }
1423
1424         function loadRestrictions() {
1425                 if( !$this->mRestrictionsLoaded ) {
1426                         $dbr =& wfGetDB( DB_SLAVE );
1427
1428                         $res = $dbr->select( 'page_restrictions', '*',
1429                                 array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1430                         $this->loadRestrictionsFromRow( $res );
1431                 }
1432         }
1433
1434         /**
1435          * Accessor/initialisation for mRestrictions
1436          *
1437          * @access public
1438          * @param string $action action that permission needs to be checked for
1439          * @return array the array of groups allowed to edit this article
1440          */
1441         function getRestrictions( $action ) {
1442                 if( $this->exists() ) {
1443                         if( !$this->mRestrictionsLoaded ) {
1444                                 $this->loadRestrictions();
1445                         }
1446                         return isset( $this->mRestrictions[$action] )
1447                                         ? $this->mRestrictions[$action]
1448                                         : array();
1449                 } else {
1450                         return array();
1451                 }
1452         }
1453
1454         /**
1455          * Is there a version of this page in the deletion archive?
1456          * @return int the number of archived revisions
1457          * @access public
1458          */
1459         function isDeleted() {
1460                 $fname = 'Title::isDeleted';
1461                 if ( $this->getNamespace() < 0 ) {
1462                         $n = 0;
1463                 } else {
1464                         $dbr =& wfGetDB( DB_SLAVE );
1465                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1466                                 'ar_title' => $this->getDBkey() ), $fname );
1467                         if( $this->getNamespace() == NS_IMAGE ) {
1468                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1469                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1470                         }
1471                 }
1472                 return (int)$n;
1473         }
1474
1475         /**
1476          * Get the article ID for this Title from the link cache,
1477          * adding it if necessary
1478          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1479          *      for update
1480          * @return int the ID
1481          */
1482         public function getArticleID( $flags = 0 ) {
1483                 $linkCache =& LinkCache::singleton();
1484                 if ( $flags & GAID_FOR_UPDATE ) {
1485                         $oldUpdate = $linkCache->forUpdate( true );
1486                         $this->mArticleID = $linkCache->addLinkObj( $this );
1487                         $linkCache->forUpdate( $oldUpdate );
1488                 } else {
1489                         if ( -1 == $this->mArticleID ) {
1490                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1491                         }
1492                 }
1493                 return $this->mArticleID;
1494         }
1495
1496         function getLatestRevID() {
1497                 if ($this->mLatestID !== false)
1498                         return $this->mLatestID;
1499
1500                 $db =& wfGetDB(DB_SLAVE);
1501                 return $this->mLatestID = $db->selectField( 'revision',
1502                         "max(rev_id)",
1503                         array('rev_page' => $this->getArticleID()),
1504                         'Title::getLatestRevID' );
1505         }
1506
1507         /**
1508          * This clears some fields in this object, and clears any associated
1509          * keys in the "bad links" section of the link cache.
1510          *
1511          * - This is called from Article::insertNewArticle() to allow
1512          * loading of the new page_id. It's also called from
1513          * Article::doDeleteArticle()
1514          *
1515          * @param int $newid the new Article ID
1516          * @access public
1517          */
1518         function resetArticleID( $newid ) {
1519                 $linkCache =& LinkCache::singleton();
1520                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1521
1522                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1523                 else { $this->mArticleID = $newid; }
1524                 $this->mRestrictionsLoaded = false;
1525                 $this->mRestrictions = array();
1526         }
1527
1528         /**
1529          * Updates page_touched for this page; called from LinksUpdate.php
1530          * @return bool true if the update succeded
1531          * @access public
1532          */
1533         function invalidateCache() {
1534                 global $wgUseFileCache;
1535
1536                 if ( wfReadOnly() ) {
1537                         return;
1538                 }
1539
1540                 $dbw =& wfGetDB( DB_MASTER );
1541                 $success = $dbw->update( 'page',
1542                         array( /* SET */
1543                                 'page_touched' => $dbw->timestamp()
1544                         ), array( /* WHERE */
1545                                 'page_namespace' => $this->getNamespace() ,
1546                                 'page_title' => $this->getDBkey()
1547                         ), 'Title::invalidateCache'
1548                 );
1549
1550                 if ($wgUseFileCache) {
1551                         $cache = new HTMLFileCache($this);
1552                         @unlink($cache->fileCacheName());
1553                 }
1554
1555                 return $success;
1556         }
1557
1558         /**
1559          * Prefix some arbitrary text with the namespace or interwiki prefix
1560          * of this object
1561          *
1562          * @param string $name the text
1563          * @return string the prefixed text
1564          * @private
1565          */
1566         /* private */ function prefix( $name ) {
1567                 $p = '';
1568                 if ( '' != $this->mInterwiki ) {
1569                         $p = $this->mInterwiki . ':';
1570                 }
1571                 if ( 0 != $this->mNamespace ) {
1572                         $p .= $this->getNsText() . ':';
1573                 }
1574                 return $p . $name;
1575         }
1576
1577         /**
1578          * Secure and split - main initialisation function for this object
1579          *
1580          * Assumes that mDbkeyform has been set, and is urldecoded
1581          * and uses underscores, but not otherwise munged.  This function
1582          * removes illegal characters, splits off the interwiki and
1583          * namespace prefixes, sets the other forms, and canonicalizes
1584          * everything.
1585          * @return bool true on success
1586          * @private
1587          */
1588         /* private */ function secureAndSplit() {
1589                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1590
1591                 # Initialisation
1592                 static $rxTc = false;
1593                 if( !$rxTc ) {
1594                         # % is needed as well
1595                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1596                 }
1597
1598                 $this->mInterwiki = $this->mFragment = '';
1599                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1600
1601                 $dbkey = $this->mDbkeyform;
1602
1603                 # Strip Unicode bidi override characters.
1604                 # Sometimes they slip into cut-n-pasted page titles, where the
1605                 # override chars get included in list displays.
1606                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1607                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1608
1609                 # Clean up whitespace
1610                 #
1611                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1612                 $dbkey = trim( $dbkey, '_' );
1613
1614                 if ( '' == $dbkey ) {
1615                         return false;
1616                 }
1617
1618                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1619                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1620                         return false;
1621                 }
1622
1623                 $this->mDbkeyform = $dbkey;
1624
1625                 # Initial colon indicates main namespace rather than specified default
1626                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1627                 if ( ':' == $dbkey{0} ) {
1628                         $this->mNamespace = NS_MAIN;
1629                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1630                 }
1631
1632                 # Namespace or interwiki prefix
1633                 $firstPass = true;
1634                 do {
1635                         $m = array();
1636                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1637                                 $p = $m[1];
1638                                 $lowerNs = $wgContLang->lc( $p );
1639                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1640                                         # Canonical namespace
1641                                         $dbkey = $m[2];
1642                                         $this->mNamespace = $ns;
1643                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1644                                         # Ordinary namespace
1645                                         $dbkey = $m[2];
1646                                         $this->mNamespace = $ns;
1647                                 } elseif( $this->getInterwikiLink( $p ) ) {
1648                                         if( !$firstPass ) {
1649                                                 # Can't make a local interwiki link to an interwiki link.
1650                                                 # That's just crazy!
1651                                                 return false;
1652                                         }
1653
1654                                         # Interwiki link
1655                                         $dbkey = $m[2];
1656                                         $this->mInterwiki = $wgContLang->lc( $p );
1657
1658                                         # Redundant interwiki prefix to the local wiki
1659                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1660                                                 if( $dbkey == '' ) {
1661                                                         # Can't have an empty self-link
1662                                                         return false;
1663                                                 }
1664                                                 $this->mInterwiki = '';
1665                                                 $firstPass = false;
1666                                                 # Do another namespace split...
1667                                                 continue;
1668                                         }
1669
1670                                         # If there's an initial colon after the interwiki, that also
1671                                         # resets the default namespace
1672                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1673                                                 $this->mNamespace = NS_MAIN;
1674                                                 $dbkey = substr( $dbkey, 1 );
1675                                         }
1676                                 }
1677                                 # If there's no recognized interwiki or namespace,
1678                                 # then let the colon expression be part of the title.
1679                         }
1680                         break;
1681                 } while( true );
1682
1683                 # We already know that some pages won't be in the database!
1684                 #
1685                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1686                         $this->mArticleID = 0;
1687                 }
1688                 $fragment = strstr( $dbkey, '#' );
1689                 if ( false !== $fragment ) {
1690                         $this->setFragment( $fragment );
1691                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1692                         # remove whitespace again: prevents "Foo_bar_#"
1693                         # becoming "Foo_bar_"
1694                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1695                 }
1696
1697                 # Reject illegal characters.
1698                 #
1699                 if( preg_match( $rxTc, $dbkey ) ) {
1700                         return false;
1701                 }
1702
1703                 /**
1704                  * Pages with "/./" or "/../" appearing in the URLs will
1705                  * often be unreachable due to the way web browsers deal
1706                  * with 'relative' URLs. Forbid them explicitly.
1707                  */
1708                 if ( strpos( $dbkey, '.' ) !== false &&
1709                      ( $dbkey === '.' || $dbkey === '..' ||
1710                        strpos( $dbkey, './' ) === 0  ||
1711                        strpos( $dbkey, '../' ) === 0 ||
1712                        strpos( $dbkey, '/./' ) !== false ||
1713                        strpos( $dbkey, '/../' ) !== false ) )
1714                 {
1715                         return false;
1716                 }
1717
1718                 /**
1719                  * Limit the size of titles to 255 bytes.
1720                  * This is typically the size of the underlying database field.
1721                  * We make an exception for special pages, which don't need to be stored
1722                  * in the database, and may edge over 255 bytes due to subpage syntax
1723                  * for long titles, e.g. [[Special:Block/Long name]]
1724                  */
1725                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1726                   strlen( $dbkey ) > 512 )
1727                 {
1728                         return false;
1729                 }
1730
1731                 /**
1732                  * Normally, all wiki links are forced to have
1733                  * an initial capital letter so [[foo]] and [[Foo]]
1734                  * point to the same place.
1735                  *
1736                  * Don't force it for interwikis, since the other
1737                  * site might be case-sensitive.
1738                  */
1739                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1740                         $dbkey = $wgContLang->ucfirst( $dbkey );
1741                 }
1742
1743                 /**
1744                  * Can't make a link to a namespace alone...
1745                  * "empty" local links can only be self-links
1746                  * with a fragment identifier.
1747                  */
1748                 if( $dbkey == '' &&
1749                         $this->mInterwiki == '' &&
1750                         $this->mNamespace != NS_MAIN ) {
1751                         return false;
1752                 }
1753
1754                 // Any remaining initial :s are illegal.
1755                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1756                         return false;
1757                 }
1758
1759                 # Fill fields
1760                 $this->mDbkeyform = $dbkey;
1761                 $this->mUrlform = wfUrlencode( $dbkey );
1762
1763                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1764
1765                 return true;
1766         }
1767
1768         /**
1769          * Set the fragment for this title
1770          * This is kind of bad, since except for this rarely-used function, Title objects
1771          * are immutable. The reason this is here is because it's better than setting the
1772          * members directly, which is what Linker::formatComment was doing previously.
1773          *
1774          * @param string $fragment text
1775          * @access kind of public
1776          */
1777         function setFragment( $fragment ) {
1778                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1779         }
1780
1781         /**
1782          * Get a Title object associated with the talk page of this article
1783          * @return Title the object for the talk page
1784          * @access public
1785          */
1786         function getTalkPage() {
1787                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1788         }
1789
1790         /**
1791          * Get a title object associated with the subject page of this
1792          * talk page
1793          *
1794          * @return Title the object for the subject page
1795          * @access public
1796          */
1797         function getSubjectPage() {
1798                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1799         }
1800
1801         /**
1802          * Get an array of Title objects linking to this Title
1803          * Also stores the IDs in the link cache.
1804          *
1805          * WARNING: do not use this function on arbitrary user-supplied titles!
1806          * On heavily-used templates it will max out the memory.
1807          *
1808          * @param string $options may be FOR UPDATE
1809          * @return array the Title objects linking here
1810          * @access public
1811          */
1812         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1813                 $linkCache =& LinkCache::singleton();
1814
1815                 if ( $options ) {
1816                         $db =& wfGetDB( DB_MASTER );
1817                 } else {
1818                         $db =& wfGetDB( DB_SLAVE );
1819                 }
1820
1821                 $res = $db->select( array( 'page', $table ),
1822                         array( 'page_namespace', 'page_title', 'page_id' ),
1823                         array(
1824                                 "{$prefix}_from=page_id",
1825                                 "{$prefix}_namespace" => $this->getNamespace(),
1826                                 "{$prefix}_title"     => $this->getDbKey() ),
1827                         'Title::getLinksTo',
1828                         $options );
1829
1830                 $retVal = array();
1831                 if ( $db->numRows( $res ) ) {
1832                         while ( $row = $db->fetchObject( $res ) ) {
1833                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1834                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1835                                         $retVal[] = $titleObj;
1836                                 }
1837                         }
1838                 }
1839                 $db->freeResult( $res );
1840                 return $retVal;
1841         }
1842
1843         /**
1844          * Get an array of Title objects using this Title as a template
1845          * Also stores the IDs in the link cache.
1846          *
1847          * WARNING: do not use this function on arbitrary user-supplied titles!
1848          * On heavily-used templates it will max out the memory.
1849          *
1850          * @param string $options may be FOR UPDATE
1851          * @return array the Title objects linking here
1852          * @access public
1853          */
1854         function getTemplateLinksTo( $options = '' ) {
1855                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1856         }
1857
1858         /**
1859          * Get an array of Title objects referring to non-existent articles linked from this page
1860          *
1861          * @param string $options may be FOR UPDATE
1862          * @return array the Title objects
1863          * @access public
1864          */
1865         function getBrokenLinksFrom( $options = '' ) {
1866                 if ( $options ) {
1867                         $db =& wfGetDB( DB_MASTER );
1868                 } else {
1869                         $db =& wfGetDB( DB_SLAVE );
1870                 }
1871
1872                 $res = $db->safeQuery(
1873                           "SELECT pl_namespace, pl_title
1874                              FROM !
1875                         LEFT JOIN !
1876                                ON pl_namespace=page_namespace
1877                               AND pl_title=page_title
1878                             WHERE pl_from=?
1879                               AND page_namespace IS NULL
1880                                   !",
1881                         $db->tableName( 'pagelinks' ),
1882                         $db->tableName( 'page' ),
1883                         $this->getArticleId(),
1884                         $options );
1885
1886                 $retVal = array();
1887                 if ( $db->numRows( $res ) ) {
1888                         while ( $row = $db->fetchObject( $res ) ) {
1889                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1890                         }
1891                 }
1892                 $db->freeResult( $res );
1893                 return $retVal;
1894         }
1895
1896
1897         /**
1898          * Get a list of URLs to purge from the Squid cache when this
1899          * page changes
1900          *
1901          * @return array the URLs
1902          * @access public
1903          */
1904         function getSquidURLs() {
1905                 global $wgContLang;
1906
1907                 $urls = array(
1908                         $this->getInternalURL(),
1909                         $this->getInternalURL( 'action=history' )
1910                 );
1911
1912                 // purge variant urls as well
1913                 if($wgContLang->hasVariants()){
1914                         $variants = $wgContLang->getVariants();
1915                         foreach($variants as $vCode){
1916                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
1917                                 $urls[] = $this->getInternalURL('',$vCode);
1918                         }
1919                 }
1920
1921                 return $urls;
1922         }
1923
1924         function purgeSquid() {
1925                 global $wgUseSquid;
1926                 if ( $wgUseSquid ) {
1927                         $urls = $this->getSquidURLs();
1928                         $u = new SquidUpdate( $urls );
1929                         $u->doUpdate();
1930                 }
1931         }
1932
1933         /**
1934          * Move this page without authentication
1935          * @param Title &$nt the new page Title
1936          * @access public
1937          */
1938         function moveNoAuth( &$nt ) {
1939                 return $this->moveTo( $nt, false );
1940         }
1941
1942         /**
1943          * Check whether a given move operation would be valid.
1944          * Returns true if ok, or a message key string for an error message
1945          * if invalid. (Scarrrrry ugly interface this.)
1946          * @param Title &$nt the new title
1947          * @param bool $auth indicates whether $wgUser's permissions
1948          *      should be checked
1949          * @return mixed true on success, message name on failure
1950          * @access public
1951          */
1952         function isValidMoveOperation( &$nt, $auth = true ) {
1953                 if( !$this or !$nt ) {
1954                         return 'badtitletext';
1955                 }
1956                 if( $this->equals( $nt ) ) {
1957                         return 'selfmove';
1958                 }
1959                 if( !$this->isMovable() || !$nt->isMovable() ) {
1960                         return 'immobile_namespace';
1961                 }
1962
1963                 $oldid = $this->getArticleID();
1964                 $newid = $nt->getArticleID();
1965
1966                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1967                         return 'articleexists';
1968                 }
1969                 if ( ( '' == $this->getDBkey() ) ||
1970                          ( !$oldid ) ||
1971                      ( '' == $nt->getDBkey() ) ) {
1972                         return 'badarticleerror';
1973                 }
1974
1975                 if ( $auth && (
1976                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1977                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1978                         return 'protectedpage';
1979                 }
1980
1981                 # The move is allowed only if (1) the target doesn't exist, or
1982                 # (2) the target is a redirect to the source, and has no history
1983                 # (so we can undo bad moves right after they're done).
1984
1985                 if ( 0 != $newid ) { # Target exists; check for validity
1986                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1987                                 return 'articleexists';
1988                         }
1989                 }
1990                 return true;
1991         }
1992
1993         /**
1994          * Move a title to a new location
1995          * @param Title &$nt the new title
1996          * @param bool $auth indicates whether $wgUser's permissions
1997          *      should be checked
1998          * @return mixed true on success, message name on failure
1999          * @access public
2000          */
2001         function moveTo( &$nt, $auth = true, $reason = '' ) {
2002                 $err = $this->isValidMoveOperation( $nt, $auth );
2003                 if( is_string( $err ) ) {
2004                         return $err;
2005                 }
2006
2007                 $pageid = $this->getArticleID();
2008                 if( $nt->exists() ) {
2009                         $this->moveOverExistingRedirect( $nt, $reason );
2010                         $pageCountChange = 0;
2011                 } else { # Target didn't exist, do normal move.
2012                         $this->moveToNewTitle( $nt, $reason );
2013                         $pageCountChange = 1;
2014                 }
2015                 $redirid = $this->getArticleID();
2016
2017                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
2018                 $dbw =& wfGetDB( DB_MASTER );
2019                 $categorylinks = $dbw->tableName( 'categorylinks' );
2020                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
2021                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
2022                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
2023                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
2024
2025                 # Update watchlists
2026
2027                 $oldnamespace = $this->getNamespace() & ~1;
2028                 $newnamespace = $nt->getNamespace() & ~1;
2029                 $oldtitle = $this->getDBkey();
2030                 $newtitle = $nt->getDBkey();
2031
2032                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2033                         WatchedItem::duplicateEntries( $this, $nt );
2034                 }
2035
2036                 # Update search engine
2037                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2038                 $u->doUpdate();
2039                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2040                 $u->doUpdate();
2041
2042                 # Update site_stats
2043                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2044                         # No longer a content page
2045                         # Not viewed, edited, removing
2046                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2047                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2048                         # Now a content page
2049                         # Not viewed, edited, adding
2050                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2051                 } elseif( $pageCountChange ) {
2052                         # Redirect added
2053                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2054                 } else {
2055                         # Nothing special
2056                         $u = false;
2057                 }
2058                 if( $u )
2059                         $u->doUpdate();
2060
2061                 global $wgUser;
2062                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2063                 return true;
2064         }
2065
2066         /**
2067          * Move page to a title which is at present a redirect to the
2068          * source page
2069          *
2070          * @param Title &$nt the page to move to, which should currently
2071          *      be a redirect
2072          * @private
2073          */
2074         function moveOverExistingRedirect( &$nt, $reason = '' ) {
2075                 global $wgUseSquid;
2076                 $fname = 'Title::moveOverExistingRedirect';
2077                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2078
2079                 if ( $reason ) {
2080                         $comment .= ": $reason";
2081                 }
2082
2083                 $now = wfTimestampNow();
2084                 $newid = $nt->getArticleID();
2085                 $oldid = $this->getArticleID();
2086                 $dbw =& wfGetDB( DB_MASTER );
2087                 $linkCache =& LinkCache::singleton();
2088
2089                 # Delete the old redirect. We don't save it to history since
2090                 # by definition if we've got here it's rather uninteresting.
2091                 # We have to remove it so that the next step doesn't trigger
2092                 # a conflict on the unique namespace+title index...
2093                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2094
2095                 # Save a null revision in the page's history notifying of the move
2096                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2097                 $nullRevId = $nullRevision->insertOn( $dbw );
2098
2099                 # Change the name of the target page:
2100                 $dbw->update( 'page',
2101                         /* SET */ array(
2102                                 'page_touched'   => $dbw->timestamp($now),
2103                                 'page_namespace' => $nt->getNamespace(),
2104                                 'page_title'     => $nt->getDBkey(),
2105                                 'page_latest'    => $nullRevId,
2106                         ),
2107                         /* WHERE */ array( 'page_id' => $oldid ),
2108                         $fname
2109                 );
2110                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2111
2112                 # Recreate the redirect, this time in the other direction.
2113                 $mwRedir = MagicWord::get( 'redirect' );
2114                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2115                 $redirectArticle = new Article( $this );
2116                 $newid = $redirectArticle->insertOn( $dbw );
2117                 $redirectRevision = new Revision( array(
2118                         'page'    => $newid,
2119                         'comment' => $comment,
2120                         'text'    => $redirectText ) );
2121                 $redirectRevision->insertOn( $dbw );
2122                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2123                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2124
2125                 # Log the move
2126                 $log = new LogPage( 'move' );
2127                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2128
2129                 # Now, we record the link from the redirect to the new title.
2130                 # It should have no other outgoing links...
2131                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2132                 $dbw->insert( 'pagelinks',
2133                         array(
2134                                 'pl_from'      => $newid,
2135                                 'pl_namespace' => $nt->getNamespace(),
2136                                 'pl_title'     => $nt->getDbKey() ),
2137                         $fname );
2138
2139                 # Purge squid
2140                 if ( $wgUseSquid ) {
2141                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2142                         $u = new SquidUpdate( $urls );
2143                         $u->doUpdate();
2144                 }
2145         }
2146
2147         /**
2148          * Move page to non-existing title.
2149          * @param Title &$nt the new Title
2150          * @private
2151          */
2152         function moveToNewTitle( &$nt, $reason = '' ) {
2153                 global $wgUseSquid;
2154                 $fname = 'MovePageForm::moveToNewTitle';
2155                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2156                 if ( $reason ) {
2157                         $comment .= ": $reason";
2158                 }
2159
2160                 $newid = $nt->getArticleID();
2161                 $oldid = $this->getArticleID();
2162                 $dbw =& wfGetDB( DB_MASTER );
2163                 $now = $dbw->timestamp();
2164                 $linkCache =& LinkCache::singleton();
2165
2166                 # Save a null revision in the page's history notifying of the move
2167                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2168                 $nullRevId = $nullRevision->insertOn( $dbw );
2169
2170                 # Rename cur entry
2171                 $dbw->update( 'page',
2172                         /* SET */ array(
2173                                 'page_touched'   => $now,
2174                                 'page_namespace' => $nt->getNamespace(),
2175                                 'page_title'     => $nt->getDBkey(),
2176                                 'page_latest'    => $nullRevId,
2177                         ),
2178                         /* WHERE */ array( 'page_id' => $oldid ),
2179                         $fname
2180                 );
2181
2182                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2183
2184                 # Insert redirect
2185                 $mwRedir = MagicWord::get( 'redirect' );
2186                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2187                 $redirectArticle = new Article( $this );
2188                 $newid = $redirectArticle->insertOn( $dbw );
2189                 $redirectRevision = new Revision( array(
2190                         'page'    => $newid,
2191                         'comment' => $comment,
2192                         'text'    => $redirectText ) );
2193                 $redirectRevision->insertOn( $dbw );
2194                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2195                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2196
2197                 # Log the move
2198                 $log = new LogPage( 'move' );
2199                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2200
2201                 # Purge caches as per article creation
2202                 Article::onArticleCreate( $nt );
2203
2204                 # Record the just-created redirect's linking to the page
2205                 $dbw->insert( 'pagelinks',
2206                         array(
2207                                 'pl_from'      => $newid,
2208                                 'pl_namespace' => $nt->getNamespace(),
2209                                 'pl_title'     => $nt->getDBkey() ),
2210                         $fname );
2211
2212                 # Purge old title from squid
2213                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2214                 $this->purgeSquid();
2215         }
2216
2217         /**
2218          * Checks if $this can be moved to a given Title
2219          * - Selects for update, so don't call it unless you mean business
2220          *
2221          * @param Title &$nt the new title to check
2222          * @access public
2223          */
2224         function isValidMoveTarget( $nt ) {
2225
2226                 $fname = 'Title::isValidMoveTarget';
2227                 $dbw =& wfGetDB( DB_MASTER );
2228
2229                 # Is it a redirect?
2230                 $id  = $nt->getArticleID();
2231                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2232                         array( 'page_is_redirect','old_text','old_flags' ),
2233                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2234                         $fname, 'FOR UPDATE' );
2235
2236                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2237                         # Not a redirect
2238                         wfDebug( __METHOD__ . ": not a redirect\n" );
2239                         return false;
2240                 }
2241                 $text = Revision::getRevisionText( $obj );
2242
2243                 # Does the redirect point to the source?
2244                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2245                 $m = array();
2246                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2247                         $redirTitle = Title::newFromText( $m[1] );
2248                         if( !is_object( $redirTitle ) ||
2249                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2250                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2251                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2252                                 return false;
2253                         }
2254                 } else {
2255                         # Fail safe
2256                         wfDebug( __METHOD__ . ": failsafe\n" );
2257                         return false;
2258                 }
2259
2260                 # Does the article have a history?
2261                 $row = $dbw->selectRow( array( 'page', 'revision'),
2262                         array( 'rev_id' ),
2263                         array( 'page_namespace' => $nt->getNamespace(),
2264                                 'page_title' => $nt->getDBkey(),
2265                                 'page_id=rev_page AND page_latest != rev_id'
2266                         ), $fname, 'FOR UPDATE'
2267                 );
2268
2269                 # Return true if there was no history
2270                 return $row === false;
2271         }
2272
2273         /**
2274          * Create a redirect; fails if the title already exists; does
2275          * not notify RC
2276          *
2277          * @param Title $dest the destination of the redirect
2278          * @param string $comment the comment string describing the move
2279          * @return bool true on success
2280          * @access public
2281          */
2282         function createRedirect( $dest, $comment ) {
2283                 if ( $this->getArticleID() ) {
2284                         return false;
2285                 }
2286
2287                 $fname = 'Title::createRedirect';
2288                 $dbw =& wfGetDB( DB_MASTER );
2289
2290                 $article = new Article( $this );
2291                 $newid = $article->insertOn( $dbw );
2292                 $revision = new Revision( array(
2293                         'page'      => $newid,
2294                         'comment'   => $comment,
2295                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2296                         ) );
2297                 $revision->insertOn( $dbw );
2298                 $article->updateRevisionOn( $dbw, $revision, 0 );
2299
2300                 # Link table
2301                 $dbw->insert( 'pagelinks',
2302                         array(
2303                                 'pl_from'      => $newid,
2304                                 'pl_namespace' => $dest->getNamespace(),
2305                                 'pl_title'     => $dest->getDbKey()
2306                         ), $fname
2307                 );
2308
2309                 Article::onArticleCreate( $this );
2310                 return true;
2311         }
2312
2313         /**
2314          * Get categories to which this Title belongs and return an array of
2315          * categories' names.
2316          *
2317          * @return array an array of parents in the form:
2318          *      $parent => $currentarticle
2319          * @access public
2320          */
2321         function getParentCategories() {
2322                 global $wgContLang;
2323
2324                 $titlekey = $this->getArticleId();
2325                 $dbr =& wfGetDB( DB_SLAVE );
2326                 $categorylinks = $dbr->tableName( 'categorylinks' );
2327
2328                 # NEW SQL
2329                 $sql = "SELECT * FROM $categorylinks"
2330                      ." WHERE cl_from='$titlekey'"
2331                          ." AND cl_from <> '0'"
2332                          ." ORDER BY cl_sortkey";
2333
2334                 $res = $dbr->query ( $sql ) ;
2335
2336                 if($dbr->numRows($res) > 0) {
2337                         while ( $x = $dbr->fetchObject ( $res ) )
2338                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2339                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2340                         $dbr->freeResult ( $res ) ;
2341                 } else {
2342                         $data = '';
2343                 }
2344                 return $data;
2345         }
2346
2347         /**
2348          * Get a tree of parent categories
2349          * @param array $children an array with the children in the keys, to check for circular refs
2350          * @return array
2351          * @access public
2352          */
2353         function getParentCategoryTree( $children = array() ) {
2354                 $parents = $this->getParentCategories();
2355
2356                 if($parents != '') {
2357                         foreach($parents as $parent => $current) {
2358                                 if ( array_key_exists( $parent, $children ) ) {
2359                                         # Circular reference
2360                                         $stack[$parent] = array();
2361                                 } else {
2362                                         $nt = Title::newFromText($parent);
2363                                         if ( $nt ) {
2364                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2365                                         }
2366                                 }
2367                         }
2368                         return $stack;
2369                 } else {
2370                         return array();
2371                 }
2372         }
2373
2374
2375         /**
2376          * Get an associative array for selecting this title from
2377          * the "page" table
2378          *
2379          * @return array
2380          * @access public
2381          */
2382         function pageCond() {
2383                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2384         }
2385
2386         /**
2387          * Get the revision ID of the previous revision
2388          *
2389          * @param integer $revision  Revision ID. Get the revision that was before this one.
2390          * @return integer $oldrevision|false
2391          */
2392         function getPreviousRevisionID( $revision ) {
2393                 $dbr =& wfGetDB( DB_SLAVE );
2394                 return $dbr->selectField( 'revision', 'rev_id',
2395                         'rev_page=' . intval( $this->getArticleId() ) .
2396                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2397         }
2398
2399         /**
2400          * Get the revision ID of the next revision
2401          *
2402          * @param integer $revision  Revision ID. Get the revision that was after this one.
2403          * @return integer $oldrevision|false
2404          */
2405         function getNextRevisionID( $revision ) {
2406                 $dbr =& wfGetDB( DB_SLAVE );
2407                 return $dbr->selectField( 'revision', 'rev_id',
2408                         'rev_page=' . intval( $this->getArticleId() ) .
2409                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2410         }
2411
2412         /**
2413          * Get the number of revisions between the given revision IDs.
2414          *
2415          * @param integer $old  Revision ID.
2416          * @param integer $new  Revision ID.
2417          * @return integer  Number of revisions between these IDs.
2418          */
2419         function countRevisionsBetween( $old, $new ) {
2420                 $dbr =& wfGetDB( DB_SLAVE );
2421                 return $dbr->selectField( 'revision', 'count(*)',
2422                         'rev_page = ' . intval( $this->getArticleId() ) .
2423                         ' AND rev_id > ' . intval( $old ) .
2424                         ' AND rev_id < ' . intval( $new ) );
2425         }
2426
2427         /**
2428          * Compare with another title.
2429          *
2430          * @param Title $title
2431          * @return bool
2432          */
2433         function equals( $title ) {
2434                 // Note: === is necessary for proper matching of number-like titles.
2435                 return $this->getInterwiki() === $title->getInterwiki()
2436                         && $this->getNamespace() == $title->getNamespace()
2437                         && $this->getDbkey() === $title->getDbkey();
2438         }
2439
2440         /**
2441          * Check if page exists
2442          * @return bool
2443          */
2444         function exists() {
2445                 return $this->getArticleId() != 0;
2446         }
2447
2448         /**
2449          * Should a link should be displayed as a known link, just based on its title?
2450          *
2451          * Currently, a self-link with a fragment and special pages are in
2452          * this category. Special pages never exist in the database.
2453          */
2454         function isAlwaysKnown() {
2455                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2456                   || NS_SPECIAL == $this->mNamespace;
2457         }
2458
2459         /**
2460          * Update page_touched timestamps and send squid purge messages for
2461          * pages linking to this title. May be sent to the job queue depending
2462          * on the number of links. Typically called on create and delete.
2463          */
2464         function touchLinks() {
2465                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2466                 $u->doUpdate();
2467
2468                 if ( $this->getNamespace() == NS_CATEGORY ) {
2469                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2470                         $u->doUpdate();
2471                 }
2472         }
2473
2474         /**
2475          * Get the last touched timestamp
2476          */
2477         function getTouched() {
2478                 $dbr =& wfGetDB( DB_SLAVE );
2479                 $touched = $dbr->selectField( 'page', 'page_touched',
2480                         array(
2481                                 'page_namespace' => $this->getNamespace(),
2482                                 'page_title' => $this->getDBkey()
2483                         ), __METHOD__
2484                 );
2485                 return $touched;
2486         }
2487
2488         /**
2489          * Get a cached value from a global cache that is invalidated when this page changes
2490          * @param string $key the key
2491          * @param callback $callback A callback function which generates the value on cache miss
2492          *
2493          * @deprecated use DependencyWrapper
2494          */
2495         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2496                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2497                         $params, new TitleDependency( $this ) );
2498         }
2499
2500         function trackbackURL() {
2501                 global $wgTitle, $wgScriptPath, $wgServer;
2502
2503                 return "$wgServer$wgScriptPath/trackback.php?article="
2504                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2505         }
2506
2507         function trackbackRDF() {
2508                 $url = htmlspecialchars($this->getFullURL());
2509                 $title = htmlspecialchars($this->getText());
2510                 $tburl = $this->trackbackURL();
2511
2512                 return "
2513 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2514          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2515          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2516 <rdf:Description
2517    rdf:about=\"$url\"
2518    dc:identifier=\"$url\"
2519    dc:title=\"$title\"
2520    trackback:ping=\"$tburl\" />
2521 </rdf:RDF>";
2522         }
2523
2524         /**
2525          * Generate strings used for xml 'id' names in monobook tabs
2526          * @return string
2527          */
2528         function getNamespaceKey() {
2529                 global $wgContLang;
2530                 switch ($this->getNamespace()) {
2531                         case NS_MAIN:
2532                         case NS_TALK:
2533                                 return 'nstab-main';
2534                         case NS_USER:
2535                         case NS_USER_TALK:
2536                                 return 'nstab-user';
2537                         case NS_MEDIA:
2538                                 return 'nstab-media';
2539                         case NS_SPECIAL:
2540                                 return 'nstab-special';
2541                         case NS_PROJECT:
2542                         case NS_PROJECT_TALK:
2543                                 return 'nstab-project';
2544                         case NS_IMAGE:
2545                         case NS_IMAGE_TALK:
2546                                 return 'nstab-image';
2547                         case NS_MEDIAWIKI:
2548                         case NS_MEDIAWIKI_TALK:
2549                                 return 'nstab-mediawiki';
2550                         case NS_TEMPLATE:
2551                         case NS_TEMPLATE_TALK:
2552                                 return 'nstab-template';
2553                         case NS_HELP:
2554                         case NS_HELP_TALK:
2555                                 return 'nstab-help';
2556                         case NS_CATEGORY:
2557                         case NS_CATEGORY_TALK:
2558                                 return 'nstab-category';
2559                         default:
2560                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2561                 }
2562         }
2563
2564         /**
2565          * Returns true if this title resolves to the named special page
2566          * @param string $name The special page name
2567          * @access public
2568          */
2569         function isSpecial( $name ) {
2570                 if ( $this->getNamespace() == NS_SPECIAL ) {
2571                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2572                         if ( $name == $thisName ) {
2573                                 return true;
2574                         }
2575                 }
2576                 return false;
2577         }
2578
2579         /**
2580          * If the Title refers to a special page alias which is not the local default,
2581          * returns a new Title which points to the local default. Otherwise, returns $this.
2582          */
2583         function fixSpecialName() {
2584                 if ( $this->getNamespace() == NS_SPECIAL ) {
2585                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2586                         if ( $canonicalName ) {
2587                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2588                                 if ( $localName != $this->mDbkeyform ) {
2589                                         return Title::makeTitle( NS_SPECIAL, $localName );
2590                                 }
2591                         }
2592                 }
2593                 return $this;
2594         }
2595
2596         /**
2597          * Is this Title in a namespace which contains content?
2598          * In other words, is this a content page, for the purposes of calculating
2599          * statistics, etc?
2600          *
2601          * @return bool
2602          */
2603         public function isContentPage() {
2604                 return Namespace::isContent( $this->getNamespace() );
2605         }
2606
2607 }
2608
2609 ?>