includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13 # Title::newFromTitle maintains a cache to avoid
  14 # expensive re-normalization of commonly used titles.
  15 # On a batch operation this can become a memory leak
  16 # if not bounded. After hitting this many titles,
  17 # reset the cache.
  18 define( 'MW_TITLECACHE_MAX', 1000 );
  19
  20 /**
  21  * Title class
  22  * - Represents a title, which may contain an interwiki designation or namespace
  23  * - Can fetch various kinds of data from the database, albeit inefficiently.
  24  *
  25  * @package MediaWiki
  26  */
  27 class Title {
  28         /**
  29          * Static cache variables
  30          */
  31         static private $titleCache=array();
  32         static private $interwikiCache=array();
  33
  34
  35         /**
  36          * All member variables should be considered private
  37          * Please use the accessor functions
  38          */
  39
  40          /**#@+
  41          * @private
  42          */
  43
  44         var $mTextform;           # Text form (spaces not underscores) of the main part
  45         var $mUrlform;            # URL-encoded form of the main part
  46         var $mDbkeyform;          # Main part with underscores
  47         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  48         var $mInterwiki;          # Interwiki prefix (or null string)
  49         var $mFragment;           # Title fragment (i.e. the bit after the #)
  50         var $mArticleID;          # Article ID, fetched from the link cache on demand
  51         var $mLatestID;         # ID of most recent revision
  52         var $mRestrictions;       # Array of groups allowed to edit this article
  53                                 # Only null or "sysop" are supported
  54         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  55         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  56         var $mDefaultNamespace;   # Namespace index when there is no namespace
  57                             # Zero except in {{transclusion}} tags
  58         var $mWatched;      # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  59         /**#@-*/
  60
  61
  62         /**
  63          * Constructor
  64          * @private
  65          */
  66         /* private */ function Title() {
  67                 $this->mInterwiki = $this->mUrlform =
  68                 $this->mTextform = $this->mDbkeyform = '';
  69                 $this->mArticleID = -1;
  70                 $this->mNamespace = NS_MAIN;
  71                 $this->mRestrictionsLoaded = false;
  72                 $this->mRestrictions = array();
  73                 # Dont change the following, NS_MAIN is hardcoded in several place
  74                 # See bug #696
  75                 $this->mDefaultNamespace = NS_MAIN;
  76                 $this->mWatched = NULL;
  77                 $this->mLatestID = false;
  78         }
  79
  80         /**
  81          * Create a new Title from a prefixed DB key
  82          * @param string $key The database key, which has underscores
  83          *      instead of spaces, possibly including namespace and
  84          *      interwiki prefixes
  85          * @return Title the new object, or NULL on an error
  86          * @static
  87          * @access public
  88          */
  89         /* static */ function newFromDBkey( $key ) {
  90                 $t = new Title();
  91                 $t->mDbkeyform = $key;
  92                 if( $t->secureAndSplit() )
  93                         return $t;
  94                 else
  95                         return NULL;
  96         }
  97
  98         /**
  99          * Create a new Title from text, such as what one would
 100          * find in a link. Decodes any HTML entities in the text.
 101          *
 102          * @param string $text the link text; spaces, prefixes,
 103          *      and an initial ':' indicating the main namespace
 104          *      are accepted
 105          * @param int $defaultNamespace the namespace to use if
 106          *      none is specified by a prefix
 107          * @return Title the new object, or NULL on an error
 108          * @static
 109          * @access public
 110          */
 111         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 112                 if( is_object( $text ) ) {
 113                         throw new MWException( 'Title::newFromText given an object' );
 114                 }
 115
 116                 /**
 117                  * Wiki pages often contain multiple links to the same page.
 118                  * Title normalization and parsing can become expensive on
 119                  * pages with many links, so we can save a little time by
 120                  * caching them.
 121                  *
 122                  * In theory these are value objects and won't get changed...
 123                  */
 124                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 125                         return Title::$titleCache[$text];
 126                 }
 127
 128                 /**
 129                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 130                  */
 131                 $filteredText = Sanitizer::decodeCharReferences( $text );
 132
 133                 $t = new Title();
 134                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 135                 $t->mDefaultNamespace = $defaultNamespace;
 136
 137                 static $cachedcount = 0 ;
 138                 if( $t->secureAndSplit() ) {
 139                         if( $defaultNamespace == NS_MAIN ) {
 140                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 141                                         # Avoid memory leaks on mass operations...
 142                                         Title::$titleCache = array();
 143                                         $cachedcount=0;
 144                                 }
 145                                 $cachedcount++;
 146                                 Title::$titleCache[$text] =& $t;
 147                         }
 148                         return $t;
 149                 } else {
 150                         $ret = NULL;
 151                         return $ret;
 152                 }
 153         }
 154
 155         /**
 156          * Create a new Title from URL-encoded text. Ensures that
 157          * the given title's length does not exceed the maximum.
 158          * @param string $url the title, as might be taken from a URL
 159          * @return Title the new object, or NULL on an error
 160          * @static
 161          * @access public
 162          */
 163         public static function newFromURL( $url ) {
 164                 global $wgLegalTitleChars;
 165                 $t = new Title();
 166
 167                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 168                 # but some URLs used it as a space replacement and they still come
 169                 # from some external search tools.
 170                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 171                         $url = str_replace( '+', ' ', $url );
 172                 }
 173
 174                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 175                 if( $t->secureAndSplit() ) {
 176                         return $t;
 177                 } else {
 178                         return NULL;
 179                 }
 180         }
 181
 182         /**
 183          * Create a new Title from an article ID
 184          *
 185          * @todo This is inefficiently implemented, the page row is requested
 186          *       but not used for anything else
 187          *
 188          * @param int $id the page_id corresponding to the Title to create
 189          * @return Title the new object, or NULL on an error
 190          * @access public
 191          * @static
 192          */
 193         function newFromID( $id ) {
 194                 $fname = 'Title::newFromID';
 195                 $dbr =& wfGetDB( DB_SLAVE );
 196                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 197                         array( 'page_id' => $id ), $fname );
 198                 if ( $row !== false ) {
 199                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 200                 } else {
 201                         $title = NULL;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Make an array of titles from an array of IDs
 208          */
 209         function newFromIDs( $ids ) {
 210                 $dbr =& wfGetDB( DB_SLAVE );
 211                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 212                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 213
 214                 $titles = array();
 215                 while ( $row = $dbr->fetchObject( $res ) ) {
 216                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 217                 }
 218                 return $titles;
 219         }
 220
 221         /**
 222          * Create a new Title from a namespace index and a DB key.
 223          * It's assumed that $ns and $title are *valid*, for instance when
 224          * they came directly from the database or a special page name.
 225          * For convenience, spaces are converted to underscores so that
 226          * eg user_text fields can be used directly.
 227          *
 228          * @param int $ns the namespace of the article
 229          * @param string $title the unprefixed database key form
 230          * @return Title the new object
 231          * @static
 232          * @access public
 233          */
 234         public static function &makeTitle( $ns, $title ) {
 235                 $t = new Title();
 236                 $t->mInterwiki = '';
 237                 $t->mFragment = '';
 238                 $t->mNamespace = intval( $ns );
 239                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 240                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 241                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 242                 $t->mTextform = str_replace( '_', ' ', $title );
 243                 return $t;
 244         }
 245
 246         /**
 247          * Create a new Title from a namespace index and a DB key.
 248          * The parameters will be checked for validity, which is a bit slower
 249          * than makeTitle() but safer for user-provided data.
 250          *
 251          * @param int $ns the namespace of the article
 252          * @param string $title the database key form
 253          * @return Title the new object, or NULL on an error
 254          * @static
 255          * @access public
 256          */
 257         public static function makeTitleSafe( $ns, $title ) {
 258                 $t = new Title();
 259                 $t->mDbkeyform = Title::makeName( $ns, $title );
 260                 if( $t->secureAndSplit() ) {
 261                         return $t;
 262                 } else {
 263                         return NULL;
 264                 }
 265         }
 266
 267         /**
 268          * Create a new Title for the Main Page
 269          *
 270          * @static
 271          * @return Title the new object
 272          * @access public
 273          */
 274         public static function newMainPage() {
 275                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 276         }
 277
 278         /**
 279          * Create a new Title for a redirect
 280          * @param string $text the redirect title text
 281          * @return Title the new object, or NULL if the text is not a
 282          *      valid redirect
 283          * @static
 284          * @access public
 285          */
 286         public static function newFromRedirect( $text ) {
 287                 $mwRedir = MagicWord::get( 'redirect' );
 288                 $rt = NULL;
 289                 if ( $mwRedir->matchStart( $text ) ) {
 290                         $m = array();
 291                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 292                                 # categories are escaped using : for example one can enter:
 293                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 294                                 if ( substr($m[1],0,1) == ':') {
 295                                         # We don't want to keep the ':'
 296                                         $m[1] = substr( $m[1], 1 );
 297                                 }
 298
 299                                 $rt = Title::newFromText( $m[1] );
 300                                 # Disallow redirects to Special:Userlogout
 301                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 302                                         $rt = NULL;
 303                                 }
 304                         }
 305                 }
 306                 return $rt;
 307         }
 308
 309 #----------------------------------------------------------------------------
 310 #       Static functions
 311 #----------------------------------------------------------------------------
 312
 313         /**
 314          * Get the prefixed DB key associated with an ID
 315          * @param int $id the page_id of the article
 316          * @return Title an object representing the article, or NULL
 317          *      if no such article was found
 318          * @static
 319          * @access public
 320          */
 321         function nameOf( $id ) {
 322                 $fname = 'Title::nameOf';
 323                 $dbr =& wfGetDB( DB_SLAVE );
 324
 325                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 326                 if ( $s === false ) { return NULL; }
 327
 328                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 329                 return $n;
 330         }
 331
 332         /**
 333          * Get a regex character class describing the legal characters in a link
 334          * @return string the list of characters, not delimited
 335          * @static
 336          * @access public
 337          */
 338         public static function legalChars() {
 339                 global $wgLegalTitleChars;
 340                 return $wgLegalTitleChars;
 341         }
 342
 343         /**
 344          * Get a string representation of a title suitable for
 345          * including in a search index
 346          *
 347          * @param int $ns a namespace index
 348          * @param string $title text-form main part
 349          * @return string a stripped-down title string ready for the
 350          *      search index
 351          */
 352         /* static */ function indexTitle( $ns, $title ) {
 353                 global $wgContLang;
 354
 355                 $lc = SearchEngine::legalSearchChars() . '&#;';
 356                 $t = $wgContLang->stripForSearch( $title );
 357                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 358                 $t = $wgContLang->lc( $t );
 359
 360                 # Handle 's, s'
 361                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 362                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 363
 364                 $t = preg_replace( "/\\s+/", ' ', $t );
 365
 366                 if ( $ns == NS_IMAGE ) {
 367                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 368                 }
 369                 return trim( $t );
 370         }
 371
 372         /*
 373          * Make a prefixed DB key from a DB key and a namespace index
 374          * @param int $ns numerical representation of the namespace
 375          * @param string $title the DB key form the title
 376          * @return string the prefixed form of the title
 377          */
 378         public static function makeName( $ns, $title ) {
 379                 global $wgContLang;
 380
 381                 $n = $wgContLang->getNsText( $ns );
 382                 return $n == '' ? $title : "$n:$title";
 383         }
 384
 385         /**
 386          * Returns the URL associated with an interwiki prefix
 387          * @param string $key the interwiki prefix (e.g. "MeatBall")
 388          * @return the associated URL, containing "$1", which should be
 389          *      replaced by an article title
 390          * @static (arguably)
 391          * @access public
 392          */
 393         function getInterwikiLink( $key )  {
 394                 global $wgMemc, $wgInterwikiExpiry;
 395                 global $wgInterwikiCache, $wgContLang;
 396                 $fname = 'Title::getInterwikiLink';
 397
 398                 $key = $wgContLang->lc( $key );
 399
 400                 $k = wfMemcKey( 'interwiki', $key );
 401                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 402                         return Title::$interwikiCache[$k]->iw_url;
 403                 }
 404
 405                 if ($wgInterwikiCache) {
 406                         return Title::getInterwikiCached( $key );
 407                 }
 408
 409                 $s = $wgMemc->get( $k );
 410                 # Ignore old keys with no iw_local
 411                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 412                         Title::$interwikiCache[$k] = $s;
 413                         return $s->iw_url;
 414                 }
 415
 416                 $dbr =& wfGetDB( DB_SLAVE );
 417                 $res = $dbr->select( 'interwiki',
 418                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 419                         array( 'iw_prefix' => $key ), $fname );
 420                 if( !$res ) {
 421                         return '';
 422                 }
 423
 424                 $s = $dbr->fetchObject( $res );
 425                 if( !$s ) {
 426                         # Cache non-existence: create a blank object and save it to memcached
 427                         $s = (object)false;
 428                         $s->iw_url = '';
 429                         $s->iw_local = 0;
 430                         $s->iw_trans = 0;
 431                 }
 432                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 433                 Title::$interwikiCache[$k] = $s;
 434
 435                 return $s->iw_url;
 436         }
 437
 438         /**
 439          * Fetch interwiki prefix data from local cache in constant database
 440          *
 441          * More logic is explained in DefaultSettings
 442          *
 443          * @return string URL of interwiki site
 444          * @access public
 445          */
 446         function getInterwikiCached( $key ) {
 447                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 448                 static $db, $site;
 449
 450                 if (!$db)
 451                         $db=dba_open($wgInterwikiCache,'r','cdb');
 452                 /* Resolve site name */
 453                 if ($wgInterwikiScopes>=3 and !$site) {
 454                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 455                         if ($site=="")
 456                                 $site = $wgInterwikiFallbackSite;
 457                 }
 458                 $value = dba_fetch( wfMemcKey( $key ), $db);
 459                 if ($value=='' and $wgInterwikiScopes>=3) {
 460                         /* try site-level */
 461                         $value = dba_fetch("_{$site}:{$key}", $db);
 462                 }
 463                 if ($value=='' and $wgInterwikiScopes>=2) {
 464                         /* try globals */
 465                         $value = dba_fetch("__global:{$key}", $db);
 466                 }
 467                 if ($value=='undef')
 468                         $value='';
 469                 $s = (object)false;
 470                 $s->iw_url = '';
 471                 $s->iw_local = 0;
 472                 $s->iw_trans = 0;
 473                 if ($value!='') {
 474                         list($local,$url)=explode(' ',$value,2);
 475                         $s->iw_url=$url;
 476                         $s->iw_local=(int)$local;
 477                 }
 478                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 479                 return $s->iw_url;
 480         }
 481         /**
 482          * Determine whether the object refers to a page within
 483          * this project.
 484          *
 485          * @return bool TRUE if this is an in-project interwiki link
 486          *      or a wikilink, FALSE otherwise
 487          * @access public
 488          */
 489         function isLocal() {
 490                 if ( $this->mInterwiki != '' ) {
 491                         # Make sure key is loaded into cache
 492                         $this->getInterwikiLink( $this->mInterwiki );
 493                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 494                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 495                 } else {
 496                         return true;
 497                 }
 498         }
 499
 500         /**
 501          * Determine whether the object refers to a page within
 502          * this project and is transcludable.
 503          *
 504          * @return bool TRUE if this is transcludable
 505          * @access public
 506          */
 507         function isTrans() {
 508                 if ($this->mInterwiki == '')
 509                         return false;
 510                 # Make sure key is loaded into cache
 511                 $this->getInterwikiLink( $this->mInterwiki );
 512                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 513                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 514         }
 515
 516         /**
 517          * Update the page_touched field for an array of title objects
 518          * @todo Inefficient unless the IDs are already loaded into the
 519          *      link cache
 520          * @param array $titles an array of Title objects to be touched
 521          * @param string $timestamp the timestamp to use instead of the
 522          *      default current time
 523          * @static
 524          * @access public
 525          */
 526         function touchArray( $titles, $timestamp = '' ) {
 527
 528                 if ( count( $titles ) == 0 ) {
 529                         return;
 530                 }
 531                 $dbw =& wfGetDB( DB_MASTER );
 532                 if ( $timestamp == '' ) {
 533                         $timestamp = $dbw->timestamp();
 534                 }
 535                 /*
 536                 $page = $dbw->tableName( 'page' );
 537                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 538                 $first = true;
 539
 540                 foreach ( $titles as $title ) {
 541                         if ( $wgUseFileCache ) {
 542                                 $cm = new HTMLFileCache($title);
 543                                 @unlink($cm->fileCacheName());
 544                         }
 545
 546                         if ( ! $first ) {
 547                                 $sql .= ',';
 548                         }
 549                         $first = false;
 550                         $sql .= $title->getArticleID();
 551                 }
 552                 $sql .= ')';
 553                 if ( ! $first ) {
 554                         $dbw->query( $sql, 'Title::touchArray' );
 555                 }
 556                 */
 557                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 558                 // do them in small chunks:
 559                 $fname = 'Title::touchArray';
 560                 foreach( $titles as $title ) {
 561                         $dbw->update( 'page',
 562                                 array( 'page_touched' => $timestamp ),
 563                                 array(
 564                                         'page_namespace' => $title->getNamespace(),
 565                                         'page_title'     => $title->getDBkey() ),
 566                                 $fname );
 567                 }
 568         }
 569
 570 #----------------------------------------------------------------------------
 571 #       Other stuff
 572 #----------------------------------------------------------------------------
 573
 574         /** Simple accessors */
 575         /**
 576          * Get the text form (spaces not underscores) of the main part
 577          * @return string
 578          * @access public
 579          */
 580         function getText() { return $this->mTextform; }
 581         /**
 582          * Get the URL-encoded form of the main part
 583          * @return string
 584          * @access public
 585          */
 586         function getPartialURL() { return $this->mUrlform; }
 587         /**
 588          * Get the main part with underscores
 589          * @return string
 590          * @access public
 591          */
 592         function getDBkey() { return $this->mDbkeyform; }
 593         /**
 594          * Get the namespace index, i.e. one of the NS_xxxx constants
 595          * @return int
 596          * @access public
 597          */
 598         function getNamespace() { return $this->mNamespace; }
 599         /**
 600          * Get the namespace text
 601          * @return string
 602          * @access public
 603          */
 604         function getNsText() {
 605                 global $wgContLang;
 606                 return $wgContLang->getNsText( $this->mNamespace );
 607         }
 608         /**
 609          * Get the namespace text of the subject (rather than talk) page
 610          * @return string
 611          * @access public
 612          */
 613         function getSubjectNsText() {
 614                 global $wgContLang;
 615                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 616         }
 617
 618         /**
 619          * Get the namespace text of the talk page
 620          * @return string
 621          */
 622         function getTalkNsText() {
 623                 global $wgContLang;
 624                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 625         }
 626
 627         /**
 628          * Could this title have a corresponding talk page?
 629          * @return bool
 630          */
 631         function canTalk() {
 632                 return( Namespace::canTalk( $this->mNamespace ) );
 633         }
 634
 635         /**
 636          * Get the interwiki prefix (or null string)
 637          * @return string
 638          * @access public
 639          */
 640         function getInterwiki() { return $this->mInterwiki; }
 641         /**
 642          * Get the Title fragment (i.e. the bit after the #)
 643          * @return string
 644          * @access public
 645          */
 646         function getFragment() { return $this->mFragment; }
 647         /**
 648          * Get the default namespace index, for when there is no namespace
 649          * @return int
 650          * @access public
 651          */
 652         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 653
 654         /**
 655          * Get title for search index
 656          * @return string a stripped-down title string ready for the
 657          *      search index
 658          */
 659         function getIndexTitle() {
 660                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 661         }
 662
 663         /**
 664          * Get the prefixed database key form
 665          * @return string the prefixed title, with underscores and
 666          *      any interwiki and namespace prefixes
 667          * @access public
 668          */
 669         function getPrefixedDBkey() {
 670                 $s = $this->prefix( $this->mDbkeyform );
 671                 $s = str_replace( ' ', '_', $s );
 672                 return $s;
 673         }
 674
 675         /**
 676          * Get the prefixed title with spaces.
 677          * This is the form usually used for display
 678          * @return string the prefixed title, with spaces
 679          * @access public
 680          */
 681         function getPrefixedText() {
 682                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 683                         $s = $this->prefix( $this->mTextform );
 684                         $s = str_replace( '_', ' ', $s );
 685                         $this->mPrefixedText = $s;
 686                 }
 687                 return $this->mPrefixedText;
 688         }
 689
 690         /**
 691          * Get the prefixed title with spaces, plus any fragment
 692          * (part beginning with '#')
 693          * @return string the prefixed title, with spaces and
 694          *      the fragment, including '#'
 695          * @access public
 696          */
 697         function getFullText() {
 698                 $text = $this->getPrefixedText();
 699                 if( '' != $this->mFragment ) {
 700                         $text .= '#' . $this->mFragment;
 701                 }
 702                 return $text;
 703         }
 704
 705         /**
 706          * Get the base name, i.e. the leftmost parts before the /
 707          * @return string Base name
 708          */
 709         function getBaseText() {
 710                 global $wgNamespacesWithSubpages;
 711                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 712                         $parts = explode( '/', $this->getText() );
 713                         # Don't discard the real title if there's no subpage involved
 714                         if( count( $parts ) > 1 )
 715                                 unset( $parts[ count( $parts ) - 1 ] );
 716                         return implode( '/', $parts );
 717                 } else {
 718                         return $this->getText();
 719                 }
 720         }
 721
 722         /**
 723          * Get the lowest-level subpage name, i.e. the rightmost part after /
 724          * @return string Subpage name
 725          */
 726         function getSubpageText() {
 727                 global $wgNamespacesWithSubpages;
 728                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 729                         $parts = explode( '/', $this->mTextform );
 730                         return( $parts[ count( $parts ) - 1 ] );
 731                 } else {
 732                         return( $this->mTextform );
 733                 }
 734         }
 735
 736         /**
 737          * Get a URL-encoded form of the subpage text
 738          * @return string URL-encoded subpage name
 739          */
 740         function getSubpageUrlForm() {
 741                 $text = $this->getSubpageText();
 742                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 743                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 744                 return( $text );
 745         }
 746
 747         /**
 748          * Get a URL-encoded title (not an actual URL) including interwiki
 749          * @return string the URL-encoded form
 750          * @access public
 751          */
 752         function getPrefixedURL() {
 753                 $s = $this->prefix( $this->mDbkeyform );
 754                 $s = str_replace( ' ', '_', $s );
 755
 756                 $s = wfUrlencode ( $s ) ;
 757
 758                 # Cleaning up URL to make it look nice -- is this safe?
 759                 $s = str_replace( '%28', '(', $s );
 760                 $s = str_replace( '%29', ')', $s );
 761
 762                 return $s;
 763         }
 764
 765         /**
 766          * Get a real URL referring to this title, with interwiki link and
 767          * fragment
 768          *
 769          * @param string $query an optional query string, not used
 770          *      for interwiki links
 771          * @param string $variant language variant of url (for sr, zh..)
 772          * @return string the URL
 773          * @access public
 774          */
 775         function getFullURL( $query = '', $variant = false ) {
 776                 global $wgContLang, $wgServer, $wgRequest;
 777
 778                 if ( '' == $this->mInterwiki ) {
 779                         $url = $this->getLocalUrl( $query, $variant );
 780
 781                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 782                         // Correct fix would be to move the prepending elsewhere.
 783                         if ($wgRequest->getVal('action') != 'render') {
 784                                 $url = $wgServer . $url;
 785                         }
 786                 } else {
 787                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 788
 789                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 790                         if ( '' != $namespace ) {
 791                                 # Can this actually happen? Interwikis shouldn't be parsed.
 792                                 $namespace .= ':';
 793                         }
 794                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 795                         if( $query != '' ) {
 796                                 if( false === strpos( $url, '?' ) ) {
 797                                         $url .= '?';
 798                                 } else {
 799                                         $url .= '&';
 800                                 }
 801                                 $url .= $query;
 802                         }
 803                 }
 804
 805                 # Finally, add the fragment.
 806                 if ( '' != $this->mFragment ) {
 807                         $url .= '#' . $this->mFragment;
 808                 }
 809
 810                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 811                 return $url;
 812         }
 813
 814         /**
 815          * Get a URL with no fragment or server name.  If this page is generated
 816          * with action=render, $wgServer is prepended.
 817          * @param string $query an optional query string; if not specified,
 818          *      $wgArticlePath will be used.
 819          * @param string $variant language variant of url (for sr, zh..)
 820          * @return string the URL
 821          * @access public
 822          */
 823         function getLocalURL( $query = '', $variant = false ) {
 824                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 825                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 826
 827                 // internal links should point to same variant as current page (only anonymous users)
 828                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 829                         $pref = $wgContLang->getPreferredVariant(false);
 830                         if($pref != $wgContLang->getCode())
 831                                 $variant = $pref;
 832                 }
 833
 834                 if ( $this->isExternal() ) {
 835                         $url = $this->getFullURL();
 836                         if ( $query ) {
 837                                 // This is currently only used for edit section links in the
 838                                 // context of interwiki transclusion. In theory we should
 839                                 // append the query to the end of any existing query string,
 840                                 // but interwiki transclusion is already broken in that case.
 841                                 $url .= "?$query";
 842                         }
 843                 } else {
 844                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 845                         if ( $query == '' ) {
 846                                 if($variant!=false && $wgContLang->hasVariants()){
 847                                         if($wgVariantArticlePath==false)
 848                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 849                                         else
 850                                                 $variantArticlePath = $wgVariantArticlePath;
 851
 852                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 853                                         $url = str_replace( '$1', $dbkey, $url  );
 854
 855                                 }
 856                                 else
 857                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 858                         } else {
 859                                 global $wgActionPaths;
 860                                 $url = false;
 861                                 $matches = array();
 862                                 if( !empty( $wgActionPaths ) &&
 863                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 864                                 {
 865                                         $action = urldecode( $matches[2] );
 866                                         if( isset( $wgActionPaths[$action] ) ) {
 867                                                 $query = $matches[1];
 868                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 869                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 870                                                 if( $query != '' ) $url .= '?' . $query;
 871                                         }
 872                                 }
 873                                 if ( $url === false ) {
 874                                         if ( $query == '-' ) {
 875                                                 $query = '';
 876                                         }
 877                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 878                                 }
 879                         }
 880
 881                         // FIXME: this causes breakage in various places when we
 882                         // actually expected a local URL and end up with dupe prefixes.
 883                         if ($wgRequest->getVal('action') == 'render') {
 884                                 $url = $wgServer . $url;
 885                         }
 886                 }
 887                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 888                 return $url;
 889         }
 890
 891         /**
 892          * Get an HTML-escaped version of the URL form, suitable for
 893          * using in a link, without a server name or fragment
 894          * @param string $query an optional query string
 895          * @return string the URL
 896          * @access public
 897          */
 898         function escapeLocalURL( $query = '' ) {
 899                 return htmlspecialchars( $this->getLocalURL( $query ) );
 900         }
 901
 902         /**
 903          * Get an HTML-escaped version of the URL form, suitable for
 904          * using in a link, including the server name and fragment
 905          *
 906          * @return string the URL
 907          * @param string $query an optional query string
 908          * @access public
 909          */
 910         function escapeFullURL( $query = '' ) {
 911                 return htmlspecialchars( $this->getFullURL( $query ) );
 912         }
 913
 914         /**
 915          * Get the URL form for an internal link.
 916          * - Used in various Squid-related code, in case we have a different
 917          * internal hostname for the server from the exposed one.
 918          *
 919          * @param string $query an optional query string
 920          * @param string $variant language variant of url (for sr, zh..)
 921          * @return string the URL
 922          * @access public
 923          */
 924         function getInternalURL( $query = '', $variant = false ) {
 925                 global $wgInternalServer;
 926                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 927                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 928                 return $url;
 929         }
 930
 931         /**
 932          * Get the edit URL for this Title
 933          * @return string the URL, or a null string if this is an
 934          *      interwiki link
 935          * @access public
 936          */
 937         function getEditURL() {
 938                 if ( '' != $this->mInterwiki ) { return ''; }
 939                 $s = $this->getLocalURL( 'action=edit' );
 940
 941                 return $s;
 942         }
 943
 944         /**
 945          * Get the HTML-escaped displayable text form.
 946          * Used for the title field in <a> tags.
 947          * @return string the text, including any prefixes
 948          * @access public
 949          */
 950         function getEscapedText() {
 951                 return htmlspecialchars( $this->getPrefixedText() );
 952         }
 953
 954         /**
 955          * Is this Title interwiki?
 956          * @return boolean
 957          * @access public
 958          */
 959         function isExternal() { return ( '' != $this->mInterwiki ); }
 960
 961         /**
 962          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 963          *
 964          * @param string Action to check (default: edit)
 965          * @return bool
 966          */
 967         function isSemiProtected( $action = 'edit' ) {
 968                 $restrictions = $this->getRestrictions( $action );
 969                 # We do a full compare because this could be an array
 970                 foreach( $restrictions as $restriction ) {
 971                         if( strtolower( $restriction ) != 'autoconfirmed' ) {
 972                                 return( false );
 973                         }
 974                 }
 975                 return( true );
 976         }
 977
 978         /**
 979          * Does the title correspond to a protected article?
 980          * @param string $what the action the page is protected from,
 981          *      by default checks move and edit
 982          * @return boolean
 983          * @access public
 984          */
 985         function isProtected( $action = '' ) {
 986                 global $wgRestrictionLevels;
 987                 if ( NS_SPECIAL == $this->mNamespace ) { return true; }
 988
 989                 if( $action == 'edit' || $action == '' ) {
 990                         $r = $this->getRestrictions( 'edit' );
 991                         foreach( $wgRestrictionLevels as $level ) {
 992                                 if( in_array( $level, $r ) && $level != '' ) {
 993                                         return( true );
 994                                 }
 995                         }
 996                 }
 997
 998                 if( $action == 'move' || $action == '' ) {
 999                         $r = $this->getRestrictions( 'move' );
1000                         foreach( $wgRestrictionLevels as $level ) {
1001                                 if( in_array( $level, $r ) && $level != '' ) {
1002                                         return( true );
1003                                 }
1004                         }
1005                 }
1006
1007                 return false;
1008         }
1009
1010         /**
1011          * Is $wgUser is watching this page?
1012          * @return boolean
1013          * @access public
1014          */
1015         function userIsWatching() {
1016                 global $wgUser;
1017
1018                 if ( is_null( $this->mWatched ) ) {
1019                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1020                                 $this->mWatched = false;
1021                         } else {
1022                                 $this->mWatched = $wgUser->isWatched( $this );
1023                         }
1024                 }
1025                 return $this->mWatched;
1026         }
1027
1028         /**
1029          * Can $wgUser perform $action this page?
1030          * @param string $action action that permission needs to be checked for
1031          * @return boolean
1032          * @private
1033          */
1034         function userCan($action) {
1035                 $fname = 'Title::userCan';
1036                 wfProfileIn( $fname );
1037
1038                 global $wgUser;
1039
1040                 $result = null;
1041                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1042                 if ( $result !== null ) {
1043                         wfProfileOut( $fname );
1044                         return $result;
1045                 }
1046
1047                 if( NS_SPECIAL == $this->mNamespace ) {
1048                         wfProfileOut( $fname );
1049                         return false;
1050                 }
1051                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
1052                 // from taking effect -ævar
1053                 if( NS_MEDIAWIKI == $this->mNamespace &&
1054                     !$wgUser->isAllowed('editinterface') ) {
1055                         wfProfileOut( $fname );
1056                         return false;
1057                 }
1058
1059                 if( $this->mDbkeyform == '_' ) {
1060                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1061                         wfProfileOut( $fname );
1062                         return false;
1063                 }
1064
1065                 # protect css/js subpages of user pages
1066                 # XXX: this might be better using restrictions
1067                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1068                 if( NS_USER == $this->mNamespace
1069                         && preg_match("/\\.(css|js)$/", $this->mTextform )
1070                         && !$wgUser->isAllowed('editinterface')
1071                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1072                         wfProfileOut( $fname );
1073                         return false;
1074                 }
1075
1076                 foreach( $this->getRestrictions($action) as $right ) {
1077                         // Backwards compatibility, rewrite sysop -> protect
1078                         if ( $right == 'sysop' ) {
1079                                 $right = 'protect';
1080                         }
1081                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1082                                 wfProfileOut( $fname );
1083                                 return false;
1084                         }
1085                 }
1086
1087                 if( $action == 'move' &&
1088                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1089                         wfProfileOut( $fname );
1090                         return false;
1091                 }
1092
1093                 if( $action == 'create' ) {
1094                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1095                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1096                                 wfProfileOut( $fname );
1097                                 return false;
1098                         }
1099                 }
1100
1101                 wfProfileOut( $fname );
1102                 return true;
1103         }
1104
1105         /**
1106          * Can $wgUser edit this page?
1107          * @return boolean
1108          * @access public
1109          */
1110         function userCanEdit() {
1111                 return $this->userCan('edit');
1112         }
1113
1114         /**
1115          * Can $wgUser create this page?
1116          * @return boolean
1117          * @access public
1118          */
1119         function userCanCreate() {
1120                 return $this->userCan('create');
1121         }
1122
1123         /**
1124          * Can $wgUser move this page?
1125          * @return boolean
1126          * @access public
1127          */
1128         function userCanMove() {
1129                 return $this->userCan('move');
1130         }
1131
1132         /**
1133          * Would anybody with sufficient privileges be able to move this page?
1134          * Some pages just aren't movable.
1135          *
1136          * @return boolean
1137          * @access public
1138          */
1139         function isMovable() {
1140                 return Namespace::isMovable( $this->getNamespace() )
1141                         && $this->getInterwiki() == '';
1142         }
1143
1144         /**
1145          * Can $wgUser read this page?
1146          * @return boolean
1147          * @access public
1148          */
1149         function userCanRead() {
1150                 global $wgUser;
1151
1152                 $result = null;
1153                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1154                 if ( $result !== null ) {
1155                         return $result;
1156                 }
1157
1158                 if( $wgUser->isAllowed('read') ) {
1159                         return true;
1160                 } else {
1161                         global $wgWhitelistRead;
1162
1163                         /**
1164                          * Always grant access to the login page.
1165                          * Even anons need to be able to log in.
1166                         */
1167                         if( $this->isSpecial( 'Userlogin' ) ) {
1168                                 return true;
1169                         }
1170
1171                         /** some pages are explicitly allowed */
1172                         $name = $this->getPrefixedText();
1173                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1174                                 return true;
1175                         }
1176
1177                         # Compatibility with old settings
1178                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1179                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1180                                         return true;
1181                                 }
1182                         }
1183                 }
1184                 return false;
1185         }
1186
1187         /**
1188          * Is this a talk page of some sort?
1189          * @return bool
1190          * @access public
1191          */
1192         function isTalkPage() {
1193                 return Namespace::isTalk( $this->getNamespace() );
1194         }
1195
1196         /**
1197          * Is this a .css or .js subpage of a user page?
1198          * @return bool
1199          * @access public
1200          */
1201         function isCssJsSubpage() {
1202                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1203         }
1204         /**
1205          * Is this a *valid* .css or .js subpage of a user page?
1206          * Check that the corresponding skin exists
1207          */
1208         function isValidCssJsSubpage() {
1209                 if ( $this->isCssJsSubpage() ) {
1210                         $skinNames = Skin::getSkinNames();
1211                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1212                 } else {
1213                         return false;
1214                 }
1215         }
1216         /**
1217          * Trim down a .css or .js subpage title to get the corresponding skin name
1218          */
1219         function getSkinFromCssJsSubpage() {
1220                 $subpage = explode( '/', $this->mTextform );
1221                 $subpage = $subpage[ count( $subpage ) - 1 ];
1222                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1223         }
1224         /**
1225          * Is this a .css subpage of a user page?
1226          * @return bool
1227          * @access public
1228          */
1229         function isCssSubpage() {
1230                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1231         }
1232         /**
1233          * Is this a .js subpage of a user page?
1234          * @return bool
1235          * @access public
1236          */
1237         function isJsSubpage() {
1238                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1239         }
1240         /**
1241          * Protect css/js subpages of user pages: can $wgUser edit
1242          * this page?
1243          *
1244          * @return boolean
1245          * @todo XXX: this might be better using restrictions
1246          * @access public
1247          */
1248         function userCanEditCssJsSubpage() {
1249                 global $wgUser;
1250                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1251         }
1252
1253         /**
1254          * Loads a string into mRestrictions array
1255          * @param string $res restrictions in string format
1256          * @access public
1257          */
1258         function loadRestrictions( $res ) {
1259                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1260                         $temp = explode( '=', trim( $restrict ) );
1261                         if(count($temp) == 1) {
1262                                 // old format should be treated as edit/move restriction
1263                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1264                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1265                         } else {
1266                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1267                         }
1268                 }
1269                 $this->mRestrictionsLoaded = true;
1270         }
1271
1272         /**
1273          * Accessor/initialisation for mRestrictions
1274          * @param string $action action that permission needs to be checked for
1275          * @return array the array of groups allowed to edit this article
1276          * @access public
1277          */
1278         function getRestrictions($action) {
1279                 $id = $this->getArticleID();
1280                 if ( 0 == $id ) { return array(); }
1281
1282                 if ( ! $this->mRestrictionsLoaded ) {
1283                         $dbr =& wfGetDB( DB_SLAVE );
1284                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1285                         $this->loadRestrictions( $res );
1286                 }
1287                 if( isset( $this->mRestrictions[$action] ) ) {
1288                         return $this->mRestrictions[$action];
1289                 }
1290                 return array();
1291         }
1292
1293         /**
1294          * Is there a version of this page in the deletion archive?
1295          * @return int the number of archived revisions
1296          * @access public
1297          */
1298         function isDeleted() {
1299                 $fname = 'Title::isDeleted';
1300                 if ( $this->getNamespace() < 0 ) {
1301                         $n = 0;
1302                 } else {
1303                         $dbr =& wfGetDB( DB_SLAVE );
1304                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1305                                 'ar_title' => $this->getDBkey() ), $fname );
1306                         if( $this->getNamespace() == NS_IMAGE ) {
1307                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1308                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1309                         }
1310                 }
1311                 return (int)$n;
1312         }
1313
1314         /**
1315          * Get the article ID for this Title from the link cache,
1316          * adding it if necessary
1317          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1318          *      for update
1319          * @return int the ID
1320          * @access public
1321          */
1322         function getArticleID( $flags = 0 ) {
1323                 $linkCache =& LinkCache::singleton();
1324                 if ( $flags & GAID_FOR_UPDATE ) {
1325                         $oldUpdate = $linkCache->forUpdate( true );
1326                         $this->mArticleID = $linkCache->addLinkObj( $this );
1327                         $linkCache->forUpdate( $oldUpdate );
1328                 } else {
1329                         if ( -1 == $this->mArticleID ) {
1330                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1331                         }
1332                 }
1333                 return $this->mArticleID;
1334         }
1335
1336         function getLatestRevID() {
1337                 if ($this->mLatestID !== false)
1338                         return $this->mLatestID;
1339
1340                 $db =& wfGetDB(DB_SLAVE);
1341                 return $this->mLatestID = $db->selectField( 'revision',
1342                         "max(rev_id)",
1343                         array('rev_page' => $this->getArticleID()),
1344                         'Title::getLatestRevID' );
1345         }
1346
1347         /**
1348          * This clears some fields in this object, and clears any associated
1349          * keys in the "bad links" section of the link cache.
1350          *
1351          * - This is called from Article::insertNewArticle() to allow
1352          * loading of the new page_id. It's also called from
1353          * Article::doDeleteArticle()
1354          *
1355          * @param int $newid the new Article ID
1356          * @access public
1357          */
1358         function resetArticleID( $newid ) {
1359                 $linkCache =& LinkCache::singleton();
1360                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1361
1362                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1363                 else { $this->mArticleID = $newid; }
1364                 $this->mRestrictionsLoaded = false;
1365                 $this->mRestrictions = array();
1366         }
1367
1368         /**
1369          * Updates page_touched for this page; called from LinksUpdate.php
1370          * @return bool true if the update succeded
1371          * @access public
1372          */
1373         function invalidateCache() {
1374                 global $wgUseFileCache;
1375
1376                 if ( wfReadOnly() ) {
1377                         return;
1378                 }
1379
1380                 $dbw =& wfGetDB( DB_MASTER );
1381                 $success = $dbw->update( 'page',
1382                         array( /* SET */
1383                                 'page_touched' => $dbw->timestamp()
1384                         ), array( /* WHERE */
1385                                 'page_namespace' => $this->getNamespace() ,
1386                                 'page_title' => $this->getDBkey()
1387                         ), 'Title::invalidateCache'
1388                 );
1389
1390                 if ($wgUseFileCache) {
1391                         $cache = new HTMLFileCache($this);
1392                         @unlink($cache->fileCacheName());
1393                 }
1394
1395                 return $success;
1396         }
1397
1398         /**
1399          * Prefix some arbitrary text with the namespace or interwiki prefix
1400          * of this object
1401          *
1402          * @param string $name the text
1403          * @return string the prefixed text
1404          * @private
1405          */
1406         /* private */ function prefix( $name ) {
1407                 global $wgContLang;
1408
1409                 $p = '';
1410                 if ( '' != $this->mInterwiki ) {
1411                         $p = $this->mInterwiki . ':';
1412                 }
1413                 if ( 0 != $this->mNamespace ) {
1414                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1415                 }
1416                 return $p . $name;
1417         }
1418
1419         /**
1420          * Secure and split - main initialisation function for this object
1421          *
1422          * Assumes that mDbkeyform has been set, and is urldecoded
1423          * and uses underscores, but not otherwise munged.  This function
1424          * removes illegal characters, splits off the interwiki and
1425          * namespace prefixes, sets the other forms, and canonicalizes
1426          * everything.
1427          * @return bool true on success
1428          * @private
1429          */
1430         /* private */ function secureAndSplit() {
1431                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1432
1433                 # Initialisation
1434                 static $rxTc = false;
1435                 if( !$rxTc ) {
1436                         # % is needed as well
1437                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1438                 }
1439
1440                 $this->mInterwiki = $this->mFragment = '';
1441                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1442
1443                 # Clean up whitespace
1444                 #
1445                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1446                 $t = trim( $t, '_' );
1447
1448                 if ( '' == $t ) {
1449                         return false;
1450                 }
1451
1452                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1453                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1454                         return false;
1455                 }
1456
1457                 $this->mDbkeyform = $t;
1458
1459                 # Initial colon indicates main namespace rather than specified default
1460                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1461                 if ( ':' == $t{0} ) {
1462                         $this->mNamespace = NS_MAIN;
1463                         $t = substr( $t, 1 ); # remove the colon but continue processing
1464                 }
1465
1466                 # Namespace or interwiki prefix
1467                 $firstPass = true;
1468                 do {
1469                         $m = array();
1470                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1471                                 $p = $m[1];
1472                                 $lowerNs = $wgContLang->lc( $p );
1473                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1474                                         # Canonical namespace
1475                                         $t = $m[2];
1476                                         $this->mNamespace = $ns;
1477                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1478                                         # Ordinary namespace
1479                                         $t = $m[2];
1480                                         $this->mNamespace = $ns;
1481                                 } elseif( $this->getInterwikiLink( $p ) ) {
1482                                         if( !$firstPass ) {
1483                                                 # Can't make a local interwiki link to an interwiki link.
1484                                                 # That's just crazy!
1485                                                 return false;
1486                                         }
1487
1488                                         # Interwiki link
1489                                         $t = $m[2];
1490                                         $this->mInterwiki = $wgContLang->lc( $p );
1491
1492                                         # Redundant interwiki prefix to the local wiki
1493                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1494                                                 if( $t == '' ) {
1495                                                         # Can't have an empty self-link
1496                                                         return false;
1497                                                 }
1498                                                 $this->mInterwiki = '';
1499                                                 $firstPass = false;
1500                                                 # Do another namespace split...
1501                                                 continue;
1502                                         }
1503
1504                                         # If there's an initial colon after the interwiki, that also
1505                                         # resets the default namespace
1506                                         if ( $t !== '' && $t[0] == ':' ) {
1507                                                 $this->mNamespace = NS_MAIN;
1508                                                 $t = substr( $t, 1 );
1509                                         }
1510                                 }
1511                                 # If there's no recognized interwiki or namespace,
1512                                 # then let the colon expression be part of the title.
1513                         }
1514                         break;
1515                 } while( true );
1516                 $r = $t;
1517
1518                 # We already know that some pages won't be in the database!
1519                 #
1520                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1521                         $this->mArticleID = 0;
1522                 }
1523                 $f = strstr( $r, '#' );
1524                 if ( false !== $f ) {
1525                         $this->mFragment = substr( $f, 1 );
1526                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1527                         # remove whitespace again: prevents "Foo_bar_#"
1528                         # becoming "Foo_bar_"
1529                         $r = preg_replace( '/_*$/', '', $r );
1530                 }
1531
1532                 # Reject illegal characters.
1533                 #
1534                 if( preg_match( $rxTc, $r ) ) {
1535                         return false;
1536                 }
1537
1538                 /**
1539                  * Pages with "/./" or "/../" appearing in the URLs will
1540                  * often be unreachable due to the way web browsers deal
1541                  * with 'relative' URLs. Forbid them explicitly.
1542                  */
1543                 if ( strpos( $r, '.' ) !== false &&
1544                      ( $r === '.' || $r === '..' ||
1545                        strpos( $r, './' ) === 0  ||
1546                        strpos( $r, '../' ) === 0 ||
1547                        strpos( $r, '/./' ) !== false ||
1548                        strpos( $r, '/../' ) !== false ) )
1549                 {
1550                         return false;
1551                 }
1552
1553                 # We shouldn't need to query the DB for the size.
1554                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1555                 if ( strlen( $r ) > 255 ) {
1556                         return false;
1557                 }
1558
1559                 /**
1560                  * Normally, all wiki links are forced to have
1561                  * an initial capital letter so [[foo]] and [[Foo]]
1562                  * point to the same place.
1563                  *
1564                  * Don't force it for interwikis, since the other
1565                  * site might be case-sensitive.
1566                  */
1567                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1568                         $t = $wgContLang->ucfirst( $r );
1569                 } else {
1570                         $t = $r;
1571                 }
1572
1573                 /**
1574                  * Can't make a link to a namespace alone...
1575                  * "empty" local links can only be self-links
1576                  * with a fragment identifier.
1577                  */
1578                 if( $t == '' &&
1579                         $this->mInterwiki == '' &&
1580                         $this->mNamespace != NS_MAIN ) {
1581                         return false;
1582                 }
1583
1584                 // Any remaining initial :s are illegal.
1585                 if ( $t !== '' && ':' == $t{0} ) {
1586                         return false;
1587                 }
1588
1589                 # Fill fields
1590                 $this->mDbkeyform = $t;
1591                 $this->mUrlform = wfUrlencode( $t );
1592
1593                 $this->mTextform = str_replace( '_', ' ', $t );
1594
1595                 return true;
1596         }
1597
1598         /**
1599          * Get a Title object associated with the talk page of this article
1600          * @return Title the object for the talk page
1601          * @access public
1602          */
1603         function getTalkPage() {
1604                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1605         }
1606
1607         /**
1608          * Get a title object associated with the subject page of this
1609          * talk page
1610          *
1611          * @return Title the object for the subject page
1612          * @access public
1613          */
1614         function getSubjectPage() {
1615                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1616         }
1617
1618         /**
1619          * Get an array of Title objects linking to this Title
1620          * Also stores the IDs in the link cache.
1621          *
1622          * WARNING: do not use this function on arbitrary user-supplied titles!
1623          * On heavily-used templates it will max out the memory.
1624          *
1625          * @param string $options may be FOR UPDATE
1626          * @return array the Title objects linking here
1627          * @access public
1628          */
1629         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1630                 $linkCache =& LinkCache::singleton();
1631
1632                 if ( $options ) {
1633                         $db =& wfGetDB( DB_MASTER );
1634                 } else {
1635                         $db =& wfGetDB( DB_SLAVE );
1636                 }
1637
1638                 $res = $db->select( array( 'page', $table ),
1639                         array( 'page_namespace', 'page_title', 'page_id' ),
1640                         array(
1641                                 "{$prefix}_from=page_id",
1642                                 "{$prefix}_namespace" => $this->getNamespace(),
1643                                 "{$prefix}_title"     => $this->getDbKey() ),
1644                         'Title::getLinksTo',
1645                         $options );
1646
1647                 $retVal = array();
1648                 if ( $db->numRows( $res ) ) {
1649                         while ( $row = $db->fetchObject( $res ) ) {
1650                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1651                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1652                                         $retVal[] = $titleObj;
1653                                 }
1654                         }
1655                 }
1656                 $db->freeResult( $res );
1657                 return $retVal;
1658         }
1659
1660         /**
1661          * Get an array of Title objects using this Title as a template
1662          * Also stores the IDs in the link cache.
1663          *
1664          * WARNING: do not use this function on arbitrary user-supplied titles!
1665          * On heavily-used templates it will max out the memory.
1666          *
1667          * @param string $options may be FOR UPDATE
1668          * @return array the Title objects linking here
1669          * @access public
1670          */
1671         function getTemplateLinksTo( $options = '' ) {
1672                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1673         }
1674
1675         /**
1676          * Get an array of Title objects referring to non-existent articles linked from this page
1677          *
1678          * @param string $options may be FOR UPDATE
1679          * @return array the Title objects
1680          * @access public
1681          */
1682         function getBrokenLinksFrom( $options = '' ) {
1683                 if ( $options ) {
1684                         $db =& wfGetDB( DB_MASTER );
1685                 } else {
1686                         $db =& wfGetDB( DB_SLAVE );
1687                 }
1688
1689                 $res = $db->safeQuery(
1690                           "SELECT pl_namespace, pl_title
1691                              FROM !
1692                         LEFT JOIN !
1693                                ON pl_namespace=page_namespace
1694                               AND pl_title=page_title
1695                             WHERE pl_from=?
1696                               AND page_namespace IS NULL
1697                                   !",
1698                         $db->tableName( 'pagelinks' ),
1699                         $db->tableName( 'page' ),
1700                         $this->getArticleId(),
1701                         $options );
1702
1703                 $retVal = array();
1704                 if ( $db->numRows( $res ) ) {
1705                         while ( $row = $db->fetchObject( $res ) ) {
1706                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1707                         }
1708                 }
1709                 $db->freeResult( $res );
1710                 return $retVal;
1711         }
1712
1713
1714         /**
1715          * Get a list of URLs to purge from the Squid cache when this
1716          * page changes
1717          *
1718          * @return array the URLs
1719          * @access public
1720          */
1721         function getSquidURLs() {
1722                 global $wgContLang;
1723
1724                 $urls = array(
1725                         $this->getInternalURL(),
1726                         $this->getInternalURL( 'action=history' )
1727                 );
1728
1729                 // purge variant urls as well
1730                 if($wgContLang->hasVariants()){
1731                         $variants = $wgContLang->getVariants();
1732                         foreach($variants as $vCode){
1733                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
1734                                 $urls[] = $this->getInternalURL('',$vCode);
1735                         }
1736                 }
1737
1738                 return $urls;
1739         }
1740
1741         function purgeSquid() {
1742                 global $wgUseSquid;
1743                 if ( $wgUseSquid ) {
1744                         $urls = $this->getSquidURLs();
1745                         $u = new SquidUpdate( $urls );
1746                         $u->doUpdate();
1747                 }
1748         }
1749
1750         /**
1751          * Move this page without authentication
1752          * @param Title &$nt the new page Title
1753          * @access public
1754          */
1755         function moveNoAuth( &$nt ) {
1756                 return $this->moveTo( $nt, false );
1757         }
1758
1759         /**
1760          * Check whether a given move operation would be valid.
1761          * Returns true if ok, or a message key string for an error message
1762          * if invalid. (Scarrrrry ugly interface this.)
1763          * @param Title &$nt the new title
1764          * @param bool $auth indicates whether $wgUser's permissions
1765          *      should be checked
1766          * @return mixed true on success, message name on failure
1767          * @access public
1768          */
1769         function isValidMoveOperation( &$nt, $auth = true ) {
1770                 if( !$this or !$nt ) {
1771                         return 'badtitletext';
1772                 }
1773                 if( $this->equals( $nt ) ) {
1774                         return 'selfmove';
1775                 }
1776                 if( !$this->isMovable() || !$nt->isMovable() ) {
1777                         return 'immobile_namespace';
1778                 }
1779
1780                 $oldid = $this->getArticleID();
1781                 $newid = $nt->getArticleID();
1782
1783                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1784                         return 'articleexists';
1785                 }
1786                 if ( ( '' == $this->getDBkey() ) ||
1787                          ( !$oldid ) ||
1788                      ( '' == $nt->getDBkey() ) ) {
1789                         return 'badarticleerror';
1790                 }
1791
1792                 if ( $auth && (
1793                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1794                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1795                         return 'protectedpage';
1796                 }
1797
1798                 # The move is allowed only if (1) the target doesn't exist, or
1799                 # (2) the target is a redirect to the source, and has no history
1800                 # (so we can undo bad moves right after they're done).
1801
1802                 if ( 0 != $newid ) { # Target exists; check for validity
1803                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1804                                 return 'articleexists';
1805                         }
1806                 }
1807                 return true;
1808         }
1809
1810         /**
1811          * Move a title to a new location
1812          * @param Title &$nt the new title
1813          * @param bool $auth indicates whether $wgUser's permissions
1814          *      should be checked
1815          * @return mixed true on success, message name on failure
1816          * @access public
1817          */
1818         function moveTo( &$nt, $auth = true, $reason = '' ) {
1819                 $err = $this->isValidMoveOperation( $nt, $auth );
1820                 if( is_string( $err ) ) {
1821                         return $err;
1822                 }
1823
1824                 $pageid = $this->getArticleID();
1825                 if( $nt->exists() ) {
1826                         $this->moveOverExistingRedirect( $nt, $reason );
1827                         $pageCountChange = 0;
1828                 } else { # Target didn't exist, do normal move.
1829                         $this->moveToNewTitle( $nt, $reason );
1830                         $pageCountChange = 1;
1831                 }
1832                 $redirid = $this->getArticleID();
1833
1834                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1835                 $dbw =& wfGetDB( DB_MASTER );
1836                 $categorylinks = $dbw->tableName( 'categorylinks' );
1837                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1838                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1839                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1840                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1841
1842                 # Update watchlists
1843
1844                 $oldnamespace = $this->getNamespace() & ~1;
1845                 $newnamespace = $nt->getNamespace() & ~1;
1846                 $oldtitle = $this->getDBkey();
1847                 $newtitle = $nt->getDBkey();
1848
1849                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1850                         WatchedItem::duplicateEntries( $this, $nt );
1851                 }
1852
1853                 # Update search engine
1854                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1855                 $u->doUpdate();
1856                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1857                 $u->doUpdate();
1858
1859                 # Update site_stats
1860                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1861                         # Moved out of main namespace
1862                         # not viewed, edited, removing
1863                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1864                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1865                         # Moved into main namespace
1866                         # not viewed, edited, adding
1867                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1868                 } elseif ( $pageCountChange ) {
1869                         # Added redirect
1870                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1871                 } else{
1872                         $u = false;
1873                 }
1874                 if ( $u ) {
1875                         $u->doUpdate();
1876                 }
1877
1878                 global $wgUser;
1879                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1880                 return true;
1881         }
1882
1883         /**
1884          * Move page to a title which is at present a redirect to the
1885          * source page
1886          *
1887          * @param Title &$nt the page to move to, which should currently
1888          *      be a redirect
1889          * @private
1890          */
1891         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1892                 global $wgUseSquid;
1893                 $fname = 'Title::moveOverExistingRedirect';
1894                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1895
1896                 if ( $reason ) {
1897                         $comment .= ": $reason";
1898                 }
1899
1900                 $now = wfTimestampNow();
1901                 $newid = $nt->getArticleID();
1902                 $oldid = $this->getArticleID();
1903                 $dbw =& wfGetDB( DB_MASTER );
1904                 $linkCache =& LinkCache::singleton();
1905
1906                 # Delete the old redirect. We don't save it to history since
1907                 # by definition if we've got here it's rather uninteresting.
1908                 # We have to remove it so that the next step doesn't trigger
1909                 # a conflict on the unique namespace+title index...
1910                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1911
1912                 # Save a null revision in the page's history notifying of the move
1913                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1914                 $nullRevId = $nullRevision->insertOn( $dbw );
1915
1916                 # Change the name of the target page:
1917                 $dbw->update( 'page',
1918                         /* SET */ array(
1919                                 'page_touched'   => $dbw->timestamp($now),
1920                                 'page_namespace' => $nt->getNamespace(),
1921                                 'page_title'     => $nt->getDBkey(),
1922                                 'page_latest'    => $nullRevId,
1923                         ),
1924                         /* WHERE */ array( 'page_id' => $oldid ),
1925                         $fname
1926                 );
1927                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1928
1929                 # Recreate the redirect, this time in the other direction.
1930                 $mwRedir = MagicWord::get( 'redirect' );
1931                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1932                 $redirectArticle = new Article( $this );
1933                 $newid = $redirectArticle->insertOn( $dbw );
1934                 $redirectRevision = new Revision( array(
1935                         'page'    => $newid,
1936                         'comment' => $comment,
1937                         'text'    => $redirectText ) );
1938                 $redirectRevision->insertOn( $dbw );
1939                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1940                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1941
1942                 # Log the move
1943                 $log = new LogPage( 'move' );
1944                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1945
1946                 # Now, we record the link from the redirect to the new title.
1947                 # It should have no other outgoing links...
1948                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1949                 $dbw->insert( 'pagelinks',
1950                         array(
1951                                 'pl_from'      => $newid,
1952                                 'pl_namespace' => $nt->getNamespace(),
1953                                 'pl_title'     => $nt->getDbKey() ),
1954                         $fname );
1955
1956                 # Purge squid
1957                 if ( $wgUseSquid ) {
1958                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1959                         $u = new SquidUpdate( $urls );
1960                         $u->doUpdate();
1961                 }
1962         }
1963
1964         /**
1965          * Move page to non-existing title.
1966          * @param Title &$nt the new Title
1967          * @private
1968          */
1969         function moveToNewTitle( &$nt, $reason = '' ) {
1970                 global $wgUseSquid;
1971                 $fname = 'MovePageForm::moveToNewTitle';
1972                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1973                 if ( $reason ) {
1974                         $comment .= ": $reason";
1975                 }
1976
1977                 $newid = $nt->getArticleID();
1978                 $oldid = $this->getArticleID();
1979                 $dbw =& wfGetDB( DB_MASTER );
1980                 $now = $dbw->timestamp();
1981                 $linkCache =& LinkCache::singleton();
1982
1983                 # Save a null revision in the page's history notifying of the move
1984                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1985                 $nullRevId = $nullRevision->insertOn( $dbw );
1986
1987                 # Rename cur entry
1988                 $dbw->update( 'page',
1989                         /* SET */ array(
1990                                 'page_touched'   => $now,
1991                                 'page_namespace' => $nt->getNamespace(),
1992                                 'page_title'     => $nt->getDBkey(),
1993                                 'page_latest'    => $nullRevId,
1994                         ),
1995                         /* WHERE */ array( 'page_id' => $oldid ),
1996                         $fname
1997                 );
1998
1999                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2000
2001                 # Insert redirect
2002                 $mwRedir = MagicWord::get( 'redirect' );
2003                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2004                 $redirectArticle = new Article( $this );
2005                 $newid = $redirectArticle->insertOn( $dbw );
2006                 $redirectRevision = new Revision( array(
2007                         'page'    => $newid,
2008                         'comment' => $comment,
2009                         'text'    => $redirectText ) );
2010                 $redirectRevision->insertOn( $dbw );
2011                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2012                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2013
2014                 # Log the move
2015                 $log = new LogPage( 'move' );
2016                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2017
2018                 # Purge caches as per article creation
2019                 Article::onArticleCreate( $nt );
2020
2021                 # Record the just-created redirect's linking to the page
2022                 $dbw->insert( 'pagelinks',
2023                         array(
2024                                 'pl_from'      => $newid,
2025                                 'pl_namespace' => $nt->getNamespace(),
2026                                 'pl_title'     => $nt->getDBkey() ),
2027                         $fname );
2028
2029                 # Purge old title from squid
2030                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2031                 $this->purgeSquid();
2032         }
2033
2034         /**
2035          * Checks if $this can be moved to a given Title
2036          * - Selects for update, so don't call it unless you mean business
2037          *
2038          * @param Title &$nt the new title to check
2039          * @access public
2040          */
2041         function isValidMoveTarget( $nt ) {
2042
2043                 $fname = 'Title::isValidMoveTarget';
2044                 $dbw =& wfGetDB( DB_MASTER );
2045
2046                 # Is it a redirect?
2047                 $id  = $nt->getArticleID();
2048                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2049                         array( 'page_is_redirect','old_text','old_flags' ),
2050                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2051                         $fname, 'FOR UPDATE' );
2052
2053                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2054                         # Not a redirect
2055                         wfDebug( __METHOD__ . ": not a redirect\n" );
2056                         return false;
2057                 }
2058                 $text = Revision::getRevisionText( $obj );
2059
2060                 # Does the redirect point to the source?
2061                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2062                 $m = array();
2063                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2064                         $redirTitle = Title::newFromText( $m[1] );
2065                         if( !is_object( $redirTitle ) ||
2066                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2067                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2068                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2069                                 return false;
2070                         }
2071                 } else {
2072                         # Fail safe
2073                         wfDebug( __METHOD__ . ": failsafe\n" );
2074                         return false;
2075                 }
2076
2077                 # Does the article have a history?
2078                 $row = $dbw->selectRow( array( 'page', 'revision'),
2079                         array( 'rev_id' ),
2080                         array( 'page_namespace' => $nt->getNamespace(),
2081                                 'page_title' => $nt->getDBkey(),
2082                                 'page_id=rev_page AND page_latest != rev_id'
2083                         ), $fname, 'FOR UPDATE'
2084                 );
2085
2086                 # Return true if there was no history
2087                 return $row === false;
2088         }
2089
2090         /**
2091          * Create a redirect; fails if the title already exists; does
2092          * not notify RC
2093          *
2094          * @param Title $dest the destination of the redirect
2095          * @param string $comment the comment string describing the move
2096          * @return bool true on success
2097          * @access public
2098          */
2099         function createRedirect( $dest, $comment ) {
2100                 if ( $this->getArticleID() ) {
2101                         return false;
2102                 }
2103
2104                 $fname = 'Title::createRedirect';
2105                 $dbw =& wfGetDB( DB_MASTER );
2106
2107                 $article = new Article( $this );
2108                 $newid = $article->insertOn( $dbw );
2109                 $revision = new Revision( array(
2110                         'page'      => $newid,
2111                         'comment'   => $comment,
2112                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2113                         ) );
2114                 $revision->insertOn( $dbw );
2115                 $article->updateRevisionOn( $dbw, $revision, 0 );
2116
2117                 # Link table
2118                 $dbw->insert( 'pagelinks',
2119                         array(
2120                                 'pl_from'      => $newid,
2121                                 'pl_namespace' => $dest->getNamespace(),
2122                                 'pl_title'     => $dest->getDbKey()
2123                         ), $fname
2124                 );
2125
2126                 Article::onArticleCreate( $this );
2127                 return true;
2128         }
2129
2130         /**
2131          * Get categories to which this Title belongs and return an array of
2132          * categories' names.
2133          *
2134          * @return array an array of parents in the form:
2135          *      $parent => $currentarticle
2136          * @access public
2137          */
2138         function getParentCategories() {
2139                 global $wgContLang;
2140
2141                 $titlekey = $this->getArticleId();
2142                 $dbr =& wfGetDB( DB_SLAVE );
2143                 $categorylinks = $dbr->tableName( 'categorylinks' );
2144
2145                 # NEW SQL
2146                 $sql = "SELECT * FROM $categorylinks"
2147                      ." WHERE cl_from='$titlekey'"
2148                          ." AND cl_from <> '0'"
2149                          ." ORDER BY cl_sortkey";
2150
2151                 $res = $dbr->query ( $sql ) ;
2152
2153                 if($dbr->numRows($res) > 0) {
2154                         while ( $x = $dbr->fetchObject ( $res ) )
2155                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2156                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2157                         $dbr->freeResult ( $res ) ;
2158                 } else {
2159                         $data = '';
2160                 }
2161                 return $data;
2162         }
2163
2164         /**
2165          * Get a tree of parent categories
2166          * @param array $children an array with the children in the keys, to check for circular refs
2167          * @return array
2168          * @access public
2169          */
2170         function getParentCategoryTree( $children = array() ) {
2171                 $parents = $this->getParentCategories();
2172
2173                 if($parents != '') {
2174                         foreach($parents as $parent => $current) {
2175                                 if ( array_key_exists( $parent, $children ) ) {
2176                                         # Circular reference
2177                                         $stack[$parent] = array();
2178                                 } else {
2179                                         $nt = Title::newFromText($parent);
2180                                         if ( $nt ) {
2181                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2182                                         }
2183                                 }
2184                         }
2185                         return $stack;
2186                 } else {
2187                         return array();
2188                 }
2189         }
2190
2191
2192         /**
2193          * Get an associative array for selecting this title from
2194          * the "page" table
2195          *
2196          * @return array
2197          * @access public
2198          */
2199         function pageCond() {
2200                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2201         }
2202
2203         /**
2204          * Get the revision ID of the previous revision
2205          *
2206          * @param integer $revision  Revision ID. Get the revision that was before this one.
2207          * @return interger $oldrevision|false
2208          */
2209         function getPreviousRevisionID( $revision ) {
2210                 $dbr =& wfGetDB( DB_SLAVE );
2211                 return $dbr->selectField( 'revision', 'rev_id',
2212                         'rev_page=' . intval( $this->getArticleId() ) .
2213                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2214         }
2215
2216         /**
2217          * Get the revision ID of the next revision
2218          *
2219          * @param integer $revision  Revision ID. Get the revision that was after this one.
2220          * @return interger $oldrevision|false
2221          */
2222         function getNextRevisionID( $revision ) {
2223                 $dbr =& wfGetDB( DB_SLAVE );
2224                 return $dbr->selectField( 'revision', 'rev_id',
2225                         'rev_page=' . intval( $this->getArticleId() ) .
2226                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2227         }
2228
2229         /**
2230          * Compare with another title.
2231          *
2232          * @param Title $title
2233          * @return bool
2234          */
2235         function equals( $title ) {
2236                 // Note: === is necessary for proper matching of number-like titles.
2237                 return $this->getInterwiki() === $title->getInterwiki()
2238                         && $this->getNamespace() == $title->getNamespace()
2239                         && $this->getDbkey() === $title->getDbkey();
2240         }
2241
2242         /**
2243          * Check if page exists
2244          * @return bool
2245          */
2246         function exists() {
2247                 return $this->getArticleId() != 0;
2248         }
2249
2250         /**
2251          * Should a link should be displayed as a known link, just based on its title?
2252          *
2253          * Currently, a self-link with a fragment and special pages are in
2254          * this category. Special pages never exist in the database.
2255          */
2256         function isAlwaysKnown() {
2257                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2258                   || NS_SPECIAL == $this->mNamespace;
2259         }
2260
2261         /**
2262          * Update page_touched timestamps and send squid purge messages for
2263          * pages linking to this title. May be sent to the job queue depending
2264          * on the number of links. Typically called on create and delete.
2265          */
2266         function touchLinks() {
2267                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2268                 $u->doUpdate();
2269
2270                 if ( $this->getNamespace() == NS_CATEGORY ) {
2271                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2272                         $u->doUpdate();
2273                 }
2274         }
2275
2276         /**
2277          * Get the last touched timestamp
2278          */
2279         function getTouched() {
2280                 $dbr =& wfGetDB( DB_SLAVE );
2281                 $touched = $dbr->selectField( 'page', 'page_touched',
2282                         array(
2283                                 'page_namespace' => $this->getNamespace(),
2284                                 'page_title' => $this->getDBkey()
2285                         ), __METHOD__
2286                 );
2287                 return $touched;
2288         }
2289
2290         /**
2291          * Get a cached value from a global cache that is invalidated when this page changes
2292          * @param string $key the key
2293          * @param callback $callback A callback function which generates the value on cache miss
2294          *
2295          * @deprecated use DependencyWrapper
2296          */
2297         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2298                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2299                         $params, new TitleDependency( $this ) );
2300         }
2301
2302         function trackbackURL() {
2303                 global $wgTitle, $wgScriptPath, $wgServer;
2304
2305                 return "$wgServer$wgScriptPath/trackback.php?article="
2306                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2307         }
2308
2309         function trackbackRDF() {
2310                 $url = htmlspecialchars($this->getFullURL());
2311                 $title = htmlspecialchars($this->getText());
2312                 $tburl = $this->trackbackURL();
2313
2314                 return "
2315 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2316          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2317          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2318 <rdf:Description
2319    rdf:about=\"$url\"
2320    dc:identifier=\"$url\"
2321    dc:title=\"$title\"
2322    trackback:ping=\"$tburl\" />
2323 </rdf:RDF>";
2324         }
2325
2326         /**
2327          * Generate strings used for xml 'id' names in monobook tabs
2328          * @return string
2329          */
2330         function getNamespaceKey() {
2331                 global $wgContLang;
2332                 switch ($this->getNamespace()) {
2333                         case NS_MAIN:
2334                         case NS_TALK:
2335                                 return 'nstab-main';
2336                         case NS_USER:
2337                         case NS_USER_TALK:
2338                                 return 'nstab-user';
2339                         case NS_MEDIA:
2340                                 return 'nstab-media';
2341                         case NS_SPECIAL:
2342                                 return 'nstab-special';
2343                         case NS_PROJECT:
2344                         case NS_PROJECT_TALK:
2345                                 return 'nstab-project';
2346                         case NS_IMAGE:
2347                         case NS_IMAGE_TALK:
2348                                 return 'nstab-image';
2349                         case NS_MEDIAWIKI:
2350                         case NS_MEDIAWIKI_TALK:
2351                                 return 'nstab-mediawiki';
2352                         case NS_TEMPLATE:
2353                         case NS_TEMPLATE_TALK:
2354                                 return 'nstab-template';
2355                         case NS_HELP:
2356                         case NS_HELP_TALK:
2357                                 return 'nstab-help';
2358                         case NS_CATEGORY:
2359                         case NS_CATEGORY_TALK:
2360                                 return 'nstab-category';
2361                         default:
2362                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2363                 }
2364         }
2365
2366         /**
2367          * Returns true if this title resolves to the named special page
2368          * @param string $name The special page name
2369          * @access public
2370          */
2371         function isSpecial( $name ) {
2372                 if ( $this->getNamespace() == NS_SPECIAL ) {
2373                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2374                         if ( $name == $thisName ) {
2375                                 return true;
2376                         }
2377                 }
2378                 return false;
2379         }
2380
2381         /**
2382          * If the Title refers to a special page alias which is not the local default,
2383          * returns a new Title which points to the local default. Otherwise, returns $this.
2384          */
2385         function fixSpecialName() {
2386                 if ( $this->getNamespace() == NS_SPECIAL ) {
2387                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2388                         if ( $canonicalName ) {
2389                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2390                                 if ( $localName != $this->mDbkeyform ) {
2391                                         return Title::makeTitle( NS_SPECIAL, $localName );
2392                                 }
2393                         }
2394                 }
2395                 return $this;
2396         }
2397 }
2398 ?>