includes/Title.php

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