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 interwiki prefix (or null string)
 609          * @return string
 610          * @access public
 611          */
 612         function getInterwiki() { return $this->mInterwiki; }
 613         /**
 614          * Get the Title fragment (i.e. the bit after the #)
 615          * @return string
 616          * @access public
 617          */
 618         function getFragment() { return $this->mFragment; }
 619         /**
 620          * Get the default namespace index, for when there is no namespace
 621          * @return int
 622          * @access public
 623          */
 624         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 625
 626         /**
 627          * Get title for search index
 628          * @return string a stripped-down title string ready for the
 629          *      search index
 630          */
 631         function getIndexTitle() {
 632                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 633         }
 634
 635         /**
 636          * Get the prefixed database key form
 637          * @return string the prefixed title, with underscores and
 638          *      any interwiki and namespace prefixes
 639          * @access public
 640          */
 641         function getPrefixedDBkey() {
 642                 $s = $this->prefix( $this->mDbkeyform );
 643                 $s = str_replace( ' ', '_', $s );
 644                 return $s;
 645         }
 646
 647         /**
 648          * Get the prefixed title with spaces.
 649          * This is the form usually used for display
 650          * @return string the prefixed title, with spaces
 651          * @access public
 652          */
 653         function getPrefixedText() {
 654                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 655                         $s = $this->prefix( $this->mTextform );
 656                         $s = str_replace( '_', ' ', $s );
 657                         $this->mPrefixedText = $s;
 658                 }
 659                 return $this->mPrefixedText;
 660         }
 661
 662         /**
 663          * Get the prefixed title with spaces, plus any fragment
 664          * (part beginning with '#')
 665          * @return string the prefixed title, with spaces and
 666          *      the fragment, including '#'
 667          * @access public
 668          */
 669         function getFullText() {
 670                 $text = $this->getPrefixedText();
 671                 if( '' != $this->mFragment ) {
 672                         $text .= '#' . $this->mFragment;
 673                 }
 674                 return $text;
 675         }
 676
 677         /**
 678          * Get the lowest-level subpage name, i.e. the rightmost part after /
 679          * @return string Subpage name
 680          */
 681         function getSubpageText() {
 682                 global $wgNamespacesWithSubpages;
 683                 if( $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 684                         $parts = explode( '/', $this->mTextform );
 685                         return( $parts[ count( $parts ) - 1 ] );
 686                 } else {
 687                         return( $this->mTextform );
 688                 }
 689         }
 690
 691         /**
 692          * Get a URL-encoded form of the subpage text
 693          * @return string URL-encoded subpage name
 694          */
 695         function getSubpageUrlForm() {
 696                 $text = $this->getSubpageText();
 697                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 698                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 699                 return( $text );
 700         }
 701
 702         /**
 703          * Get a URL-encoded title (not an actual URL) including interwiki
 704          * @return string the URL-encoded form
 705          * @access public
 706          */
 707         function getPrefixedURL() {
 708                 $s = $this->prefix( $this->mDbkeyform );
 709                 $s = str_replace( ' ', '_', $s );
 710
 711                 $s = wfUrlencode ( $s ) ;
 712
 713                 # Cleaning up URL to make it look nice -- is this safe?
 714                 $s = str_replace( '%28', '(', $s );
 715                 $s = str_replace( '%29', ')', $s );
 716
 717                 return $s;
 718         }
 719
 720         /**
 721          * Get a real URL referring to this title, with interwiki link and
 722          * fragment
 723          *
 724          * @param string $query an optional query string, not used
 725          *      for interwiki links
 726          * @return string the URL
 727          * @access public
 728          */
 729         function getFullURL( $query = '' ) {
 730                 global $wgContLang, $wgServer, $wgRequest;
 731
 732                 if ( '' == $this->mInterwiki ) {
 733                         $url = $this->getLocalUrl( $query );
 734
 735                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 736                         // Correct fix would be to move the prepending elsewhere.
 737                         if ($wgRequest->getVal('action') != 'render') {
 738                                 $url = $wgServer . $url;
 739                         }
 740                 } else {
 741                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 742
 743                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 744                         if ( '' != $namespace ) {
 745                                 # Can this actually happen? Interwikis shouldn't be parsed.
 746                                 $namespace .= ':';
 747                         }
 748                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 749                         if( $query != '' ) {
 750                                 if( false === strpos( $url, '?' ) ) {
 751                                         $url .= '?';
 752                                 } else {
 753                                         $url .= '&';
 754                                 }
 755                                 $url .= $query;
 756                         }
 757                         if ( '' != $this->mFragment ) {
 758                                 $url .= '#' . $this->mFragment;
 759                         }
 760                 }
 761                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 762                 return $url;
 763         }
 764
 765         /**
 766          * Get a URL with no fragment or server name.  If this page is generated
 767          * with action=render, $wgServer is prepended.
 768          * @param string $query an optional query string; if not specified,
 769          *      $wgArticlePath will be used.
 770          * @return string the URL
 771          * @access public
 772          */
 773         function getLocalURL( $query = '' ) {
 774                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 775
 776                 if ( $this->isExternal() ) {
 777                         $url = $this->getFullURL();
 778                         if ( $query ) {
 779                                 // This is currently only used for edit section links in the
 780                                 // context of interwiki transclusion. In theory we should
 781                                 // append the query to the end of any existing query string,
 782                                 // but interwiki transclusion is already broken in that case.
 783                                 $url .= "?$query";
 784                         }
 785                 } else {
 786                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 787                         if ( $query == '' ) {
 788                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
 789                         } else {
 790                                 global $wgActionPaths;
 791                                 $url = false;
 792                                 if( !empty( $wgActionPaths ) &&
 793                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 794                                 {
 795                                         $action = urldecode( $matches[2] );
 796                                         if( isset( $wgActionPaths[$action] ) ) {
 797                                                 $query = $matches[1];
 798                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 799                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 800                                                 if( $query != '' ) $url .= '?' . $query;
 801                                         }
 802                                 }
 803                                 if ( $url === false ) {
 804                                         if ( $query == '-' ) {
 805                                                 $query = '';
 806                                         }
 807                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 808                                 }
 809                         }
 810
 811                         // FIXME: this causes breakage in various places when we
 812                         // actually expected a local URL and end up with dupe prefixes.
 813                         if ($wgRequest->getVal('action') == 'render') {
 814                                 $url = $wgServer . $url;
 815                         }
 816                 }
 817                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 818                 return $url;
 819         }
 820
 821         /**
 822          * Get an HTML-escaped version of the URL form, suitable for
 823          * using in a link, without a server name or fragment
 824          * @param string $query an optional query string
 825          * @return string the URL
 826          * @access public
 827          */
 828         function escapeLocalURL( $query = '' ) {
 829                 return htmlspecialchars( $this->getLocalURL( $query ) );
 830         }
 831
 832         /**
 833          * Get an HTML-escaped version of the URL form, suitable for
 834          * using in a link, including the server name and fragment
 835          *
 836          * @return string the URL
 837          * @param string $query an optional query string
 838          * @access public
 839          */
 840         function escapeFullURL( $query = '' ) {
 841                 return htmlspecialchars( $this->getFullURL( $query ) );
 842         }
 843
 844         /**
 845          * Get the URL form for an internal link.
 846          * - Used in various Squid-related code, in case we have a different
 847          * internal hostname for the server from the exposed one.
 848          *
 849          * @param string $query an optional query string
 850          * @return string the URL
 851          * @access public
 852          */
 853         function getInternalURL( $query = '' ) {
 854                 global $wgInternalServer;
 855                 $url = $wgInternalServer . $this->getLocalURL( $query );
 856                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 857                 return $url;
 858         }
 859
 860         /**
 861          * Get the edit URL for this Title
 862          * @return string the URL, or a null string if this is an
 863          *      interwiki link
 864          * @access public
 865          */
 866         function getEditURL() {
 867                 if ( '' != $this->mInterwiki ) { return ''; }
 868                 $s = $this->getLocalURL( 'action=edit' );
 869
 870                 return $s;
 871         }
 872
 873         /**
 874          * Get the HTML-escaped displayable text form.
 875          * Used for the title field in <a> tags.
 876          * @return string the text, including any prefixes
 877          * @access public
 878          */
 879         function getEscapedText() {
 880                 return htmlspecialchars( $this->getPrefixedText() );
 881         }
 882
 883         /**
 884          * Is this Title interwiki?
 885          * @return boolean
 886          * @access public
 887          */
 888         function isExternal() { return ( '' != $this->mInterwiki ); }
 889
 890         /**
 891          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 892          *
 893          * @param string Action to check (default: edit)
 894          * @return bool
 895          */
 896         function isSemiProtected( $action = 'edit' ) {
 897                 $restrictions = $this->getRestrictions( $action );
 898                 # We do a full compare because this could be an array
 899                 foreach( $restrictions as $restriction ) {
 900                         if( strtolower( $restriction ) != 'autoconfirmed' ) {
 901                                 return( false );
 902                         }
 903                 }
 904                 return( true );
 905         }
 906
 907         /**
 908          * Does the title correspond to a protected article?
 909          * @param string $what the action the page is protected from,
 910          *      by default checks move and edit
 911          * @return boolean
 912          * @access public
 913          */
 914         function isProtected( $action = '' ) {
 915                 global $wgRestrictionLevels;
 916                 if ( -1 == $this->mNamespace ) { return true; }
 917
 918                 if( $action == 'edit' || $action == '' ) {
 919                         $r = $this->getRestrictions( 'edit' );
 920                         foreach( $wgRestrictionLevels as $level ) {
 921                                 if( in_array( $level, $r ) && $level != '' ) {
 922                                         return( true );
 923                                 }
 924                         }
 925                 }
 926
 927                 if( $action == 'move' || $action == '' ) {
 928                         $r = $this->getRestrictions( 'move' );
 929                         foreach( $wgRestrictionLevels as $level ) {
 930                                 if( in_array( $level, $r ) && $level != '' ) {
 931                                         return( true );
 932                                 }
 933                         }
 934                 }
 935
 936                 return false;
 937         }
 938
 939         /**
 940          * Is $wgUser is watching this page?
 941          * @return boolean
 942          * @access public
 943          */
 944         function userIsWatching() {
 945                 global $wgUser;
 946
 947                 if ( is_null( $this->mWatched ) ) {
 948                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 949                                 $this->mWatched = false;
 950                         } else {
 951                                 $this->mWatched = $wgUser->isWatched( $this );
 952                         }
 953                 }
 954                 return $this->mWatched;
 955         }
 956
 957         /**
 958          * Can $wgUser perform $action this page?
 959          * @param string $action action that permission needs to be checked for
 960          * @return boolean
 961          * @access private
 962          */
 963         function userCan($action) {
 964                 $fname = 'Title::userCan';
 965                 wfProfileIn( $fname );
 966
 967                 global $wgUser;
 968
 969                 $result = null;
 970                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
 971                 if ( $result !== null ) {
 972                         wfProfileOut( $fname );
 973                         return $result;
 974                 }
 975
 976                 if( NS_SPECIAL == $this->mNamespace ) {
 977                         wfProfileOut( $fname );
 978                         return false;
 979                 }
 980                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
 981                 // from taking effect -ævar
 982                 if( NS_MEDIAWIKI == $this->mNamespace &&
 983                     !$wgUser->isAllowed('editinterface') ) {
 984                         wfProfileOut( $fname );
 985                         return false;
 986                 }
 987
 988                 if( $this->mDbkeyform == '_' ) {
 989                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 990                         wfProfileOut( $fname );
 991                         return false;
 992                 }
 993
 994                 # protect global styles and js
 995                 if ( NS_MEDIAWIKI == $this->mNamespace
 996                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 997                      && !$wgUser->isAllowed('editinterface') ) {
 998                         wfProfileOut( $fname );
 999                         return false;
1000                 }
1001
1002                 # protect css/js subpages of user pages
1003                 # XXX: this might be better using restrictions
1004                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1005                 if( NS_USER == $this->mNamespace
1006                         && preg_match("/\\.(css|js)$/", $this->mTextform )
1007                         && !$wgUser->isAllowed('editinterface')
1008                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1009                         wfProfileOut( $fname );
1010                         return false;
1011                 }
1012
1013                 foreach( $this->getRestrictions($action) as $right ) {
1014                         // Backwards compatibility, rewrite sysop -> protect
1015                         if ( $right == 'sysop' ) {
1016                                 $right = 'protect';
1017                         }
1018                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1019                                 wfProfileOut( $fname );
1020                                 return false;
1021                         }
1022                 }
1023
1024                 if( $action == 'move' &&
1025                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1026                         wfProfileOut( $fname );
1027                         return false;
1028                 }
1029
1030                 if( $action == 'create' ) {
1031                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1032                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1033                                 return false;
1034                         }
1035                 }
1036
1037                 wfProfileOut( $fname );
1038                 return true;
1039         }
1040
1041         /**
1042          * Can $wgUser edit this page?
1043          * @return boolean
1044          * @access public
1045          */
1046         function userCanEdit() {
1047                 return $this->userCan('edit');
1048         }
1049
1050         /**
1051          * Can $wgUser move this page?
1052          * @return boolean
1053          * @access public
1054          */
1055         function userCanMove() {
1056                 return $this->userCan('move');
1057         }
1058
1059         /**
1060          * Would anybody with sufficient privileges be able to move this page?
1061          * Some pages just aren't movable.
1062          *
1063          * @return boolean
1064          * @access public
1065          */
1066         function isMovable() {
1067                 return Namespace::isMovable( $this->getNamespace() )
1068                         && $this->getInterwiki() == '';
1069         }
1070
1071         /**
1072          * Can $wgUser read this page?
1073          * @return boolean
1074          * @access public
1075          */
1076         function userCanRead() {
1077                 global $wgUser;
1078
1079                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1080                 if ( $result !== null ) {
1081                         return $result;
1082                 }
1083
1084                 if( $wgUser->isAllowed('read') ) {
1085                         return true;
1086                 } else {
1087                         global $wgWhitelistRead;
1088
1089                         /** If anon users can create an account,
1090                             they need to reach the login page first! */
1091                         if( $wgUser->isAllowed( 'createaccount' )
1092                             && $this->getNamespace() == NS_SPECIAL
1093                             && $this->getText() == 'Userlogin' ) {
1094                                 return true;
1095                         }
1096
1097                         /** some pages are explicitly allowed */
1098                         $name = $this->getPrefixedText();
1099                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1100                                 return true;
1101                         }
1102
1103                         # Compatibility with old settings
1104                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1105                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1106                                         return true;
1107                                 }
1108                         }
1109                 }
1110                 return false;
1111         }
1112
1113         /**
1114          * Is this a talk page of some sort?
1115          * @return bool
1116          * @access public
1117          */
1118         function isTalkPage() {
1119                 return Namespace::isTalk( $this->getNamespace() );
1120         }
1121
1122         /**
1123          * Is this a .css or .js subpage of a user page?
1124          * @return bool
1125          * @access public
1126          */
1127         function isCssJsSubpage() {
1128                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1129         }
1130         /**
1131          * Is this a *valid* .css or .js subpage of a user page?
1132          * Check that the corresponding skin exists
1133          */
1134         function isValidCssJsSubpage() {
1135                 global $wgValidSkinNames;
1136                 return( $this->isCssJsSubpage() && array_key_exists( $this->getSkinFromCssJsSubpage(), $wgValidSkinNames ) );
1137         }
1138         /**
1139          * Trim down a .css or .js subpage title to get the corresponding skin name
1140          */
1141         function getSkinFromCssJsSubpage() {
1142                 $subpage = explode( '/', $this->mTextform );
1143                 $subpage = $subpage[ count( $subpage ) - 1 ];
1144                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1145         }
1146         /**
1147          * Is this a .css subpage of a user page?
1148          * @return bool
1149          * @access public
1150          */
1151         function isCssSubpage() {
1152                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1153         }
1154         /**
1155          * Is this a .js subpage of a user page?
1156          * @return bool
1157          * @access public
1158          */
1159         function isJsSubpage() {
1160                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1161         }
1162         /**
1163          * Protect css/js subpages of user pages: can $wgUser edit
1164          * this page?
1165          *
1166          * @return boolean
1167          * @todo XXX: this might be better using restrictions
1168          * @access public
1169          */
1170         function userCanEditCssJsSubpage() {
1171                 global $wgUser;
1172                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1173         }
1174
1175         /**
1176          * Loads a string into mRestrictions array
1177          * @param string $res restrictions in string format
1178          * @access public
1179          */
1180         function loadRestrictions( $res ) {
1181                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1182                         $temp = explode( '=', trim( $restrict ) );
1183                         if(count($temp) == 1) {
1184                                 // old format should be treated as edit/move restriction
1185                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1186                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1187                         } else {
1188                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1189                         }
1190                 }
1191                 $this->mRestrictionsLoaded = true;
1192         }
1193
1194         /**
1195          * Accessor/initialisation for mRestrictions
1196          * @param string $action action that permission needs to be checked for
1197          * @return array the array of groups allowed to edit this article
1198          * @access public
1199          */
1200         function getRestrictions($action) {
1201                 $id = $this->getArticleID();
1202                 if ( 0 == $id ) { return array(); }
1203
1204                 if ( ! $this->mRestrictionsLoaded ) {
1205                         $dbr =& wfGetDB( DB_SLAVE );
1206                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1207                         $this->loadRestrictions( $res );
1208                 }
1209                 if( isset( $this->mRestrictions[$action] ) ) {
1210                         return $this->mRestrictions[$action];
1211                 }
1212                 return array();
1213         }
1214
1215         /**
1216          * Is there a version of this page in the deletion archive?
1217          * @return int the number of archived revisions
1218          * @access public
1219          */
1220         function isDeleted() {
1221                 $fname = 'Title::isDeleted';
1222                 if ( $this->getNamespace() < 0 ) {
1223                         $n = 0;
1224                 } else {
1225                         $dbr =& wfGetDB( DB_SLAVE );
1226                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1227                                 'ar_title' => $this->getDBkey() ), $fname );
1228                 }
1229                 return (int)$n;
1230         }
1231
1232         /**
1233          * Get the article ID for this Title from the link cache,
1234          * adding it if necessary
1235          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1236          *      for update
1237          * @return int the ID
1238          * @access public
1239          */
1240         function getArticleID( $flags = 0 ) {
1241                 $linkCache =& LinkCache::singleton();
1242                 if ( $flags & GAID_FOR_UPDATE ) {
1243                         $oldUpdate = $linkCache->forUpdate( true );
1244                         $this->mArticleID = $linkCache->addLinkObj( $this );
1245                         $linkCache->forUpdate( $oldUpdate );
1246                 } else {
1247                         if ( -1 == $this->mArticleID ) {
1248                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1249                         }
1250                 }
1251                 return $this->mArticleID;
1252         }
1253
1254         function getLatestRevID() {
1255                 if ($this->mLatestID !== false)
1256                         return $this->mLatestID;
1257
1258                 $db =& wfGetDB(DB_SLAVE);
1259                 return $this->mLatestID = $db->selectField( 'revision',
1260                         "max(rev_id)",
1261                         array('rev_page' => $this->getArticleID()),
1262                         'Title::getLatestRevID' );
1263         }
1264
1265         /**
1266          * This clears some fields in this object, and clears any associated
1267          * keys in the "bad links" section of the link cache.
1268          *
1269          * - This is called from Article::insertNewArticle() to allow
1270          * loading of the new page_id. It's also called from
1271          * Article::doDeleteArticle()
1272          *
1273          * @param int $newid the new Article ID
1274          * @access public
1275          */
1276         function resetArticleID( $newid ) {
1277                 $linkCache =& LinkCache::singleton();
1278                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1279
1280                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1281                 else { $this->mArticleID = $newid; }
1282                 $this->mRestrictionsLoaded = false;
1283                 $this->mRestrictions = array();
1284         }
1285
1286         /**
1287          * Updates page_touched for this page; called from LinksUpdate.php
1288          * @return bool true if the update succeded
1289          * @access public
1290          */
1291         function invalidateCache() {
1292                 global $wgUseFileCache;
1293
1294                 if ( wfReadOnly() ) {
1295                         return;
1296                 }
1297
1298                 $dbw =& wfGetDB( DB_MASTER );
1299                 $success = $dbw->update( 'page',
1300                         array( /* SET */
1301                                 'page_touched' => $dbw->timestamp()
1302                         ), array( /* WHERE */
1303                                 'page_namespace' => $this->getNamespace() ,
1304                                 'page_title' => $this->getDBkey()
1305                         ), 'Title::invalidateCache'
1306                 );
1307
1308                 if ($wgUseFileCache) {
1309                         $cache = new CacheManager($this);
1310                         @unlink($cache->fileCacheName());
1311                 }
1312
1313                 return $success;
1314         }
1315
1316         /**
1317          * Prefix some arbitrary text with the namespace or interwiki prefix
1318          * of this object
1319          *
1320          * @param string $name the text
1321          * @return string the prefixed text
1322          * @access private
1323          */
1324         /* private */ function prefix( $name ) {
1325                 global $wgContLang;
1326
1327                 $p = '';
1328                 if ( '' != $this->mInterwiki ) {
1329                         $p = $this->mInterwiki . ':';
1330                 }
1331                 if ( 0 != $this->mNamespace ) {
1332                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1333                 }
1334                 return $p . $name;
1335         }
1336
1337         /**
1338          * Secure and split - main initialisation function for this object
1339          *
1340          * Assumes that mDbkeyform has been set, and is urldecoded
1341          * and uses underscores, but not otherwise munged.  This function
1342          * removes illegal characters, splits off the interwiki and
1343          * namespace prefixes, sets the other forms, and canonicalizes
1344          * everything.
1345          * @return bool true on success
1346          * @access private
1347          */
1348         /* private */ function secureAndSplit() {
1349                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1350                 $fname = 'Title::secureAndSplit';
1351
1352                 # Initialisation
1353                 static $rxTc = false;
1354                 if( !$rxTc ) {
1355                         # % is needed as well
1356                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1357                 }
1358
1359                 $this->mInterwiki = $this->mFragment = '';
1360                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1361
1362                 # Clean up whitespace
1363                 #
1364                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1365                 $t = trim( $t, '_' );
1366
1367                 if ( '' == $t ) {
1368                         return false;
1369                 }
1370
1371                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1372                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1373                         return false;
1374                 }
1375
1376                 $this->mDbkeyform = $t;
1377
1378                 # Initial colon indicates main namespace rather than specified default
1379                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1380                 if ( ':' == $t{0} ) {
1381                         $this->mNamespace = NS_MAIN;
1382                         $t = substr( $t, 1 ); # remove the colon but continue processing
1383                 }
1384
1385                 # Namespace or interwiki prefix
1386                 $firstPass = true;
1387                 do {
1388                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1389                                 $p = $m[1];
1390                                 $lowerNs = strtolower( $p );
1391                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1392                                         # Canonical namespace
1393                                         $t = $m[2];
1394                                         $this->mNamespace = $ns;
1395                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1396                                         # Ordinary namespace
1397                                         $t = $m[2];
1398                                         $this->mNamespace = $ns;
1399                                 } elseif( $this->getInterwikiLink( $p ) ) {
1400                                         if( !$firstPass ) {
1401                                                 # Can't make a local interwiki link to an interwiki link.
1402                                                 # That's just crazy!
1403                                                 return false;
1404                                         }
1405
1406                                         # Interwiki link
1407                                         $t = $m[2];
1408                                         $this->mInterwiki = strtolower( $p );
1409
1410                                         # Redundant interwiki prefix to the local wiki
1411                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1412                                                 if( $t == '' ) {
1413                                                         # Can't have an empty self-link
1414                                                         return false;
1415                                                 }
1416                                                 $this->mInterwiki = '';
1417                                                 $firstPass = false;
1418                                                 # Do another namespace split...
1419                                                 continue;
1420                                         }
1421
1422                                         # If there's an initial colon after the interwiki, that also
1423                                         # resets the default namespace
1424                                         if ( $t !== '' && $t[0] == ':' ) {
1425                                                 $this->mNamespace = NS_MAIN;
1426                                                 $t = substr( $t, 1 );
1427                                         }
1428                                 }
1429                                 # If there's no recognized interwiki or namespace,
1430                                 # then let the colon expression be part of the title.
1431                         }
1432                         break;
1433                 } while( true );
1434                 $r = $t;
1435
1436                 # We already know that some pages won't be in the database!
1437                 #
1438                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1439                         $this->mArticleID = 0;
1440                 }
1441                 $f = strstr( $r, '#' );
1442                 if ( false !== $f ) {
1443                         $this->mFragment = substr( $f, 1 );
1444                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1445                         # remove whitespace again: prevents "Foo_bar_#"
1446                         # becoming "Foo_bar_"
1447                         $r = preg_replace( '/_*$/', '', $r );
1448                 }
1449
1450                 # Reject illegal characters.
1451                 #
1452                 if( preg_match( $rxTc, $r ) ) {
1453                         return false;
1454                 }
1455
1456                 /**
1457                  * Pages with "/./" or "/../" appearing in the URLs will
1458                  * often be unreachable due to the way web browsers deal
1459                  * with 'relative' URLs. Forbid them explicitly.
1460                  */
1461                 if ( strpos( $r, '.' ) !== false &&
1462                      ( $r === '.' || $r === '..' ||
1463                        strpos( $r, './' ) === 0  ||
1464                        strpos( $r, '../' ) === 0 ||
1465                        strpos( $r, '/./' ) !== false ||
1466                        strpos( $r, '/../' ) !== false ) )
1467                 {
1468                         return false;
1469                 }
1470
1471                 # We shouldn't need to query the DB for the size.
1472                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1473                 if ( strlen( $r ) > 255 ) {
1474                         return false;
1475                 }
1476
1477                 /**
1478                  * Normally, all wiki links are forced to have
1479                  * an initial capital letter so [[foo]] and [[Foo]]
1480                  * point to the same place.
1481                  *
1482                  * Don't force it for interwikis, since the other
1483                  * site might be case-sensitive.
1484                  */
1485                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1486                         $t = $wgContLang->ucfirst( $r );
1487                 } else {
1488                         $t = $r;
1489                 }
1490
1491                 /**
1492                  * Can't make a link to a namespace alone...
1493                  * "empty" local links can only be self-links
1494                  * with a fragment identifier.
1495                  */
1496                 if( $t == '' &&
1497                         $this->mInterwiki == '' &&
1498                         $this->mNamespace != NS_MAIN ) {
1499                         return false;
1500                 }
1501
1502                 # Fill fields
1503                 $this->mDbkeyform = $t;
1504                 $this->mUrlform = wfUrlencode( $t );
1505
1506                 $this->mTextform = str_replace( '_', ' ', $t );
1507
1508                 return true;
1509         }
1510
1511         /**
1512          * Get a Title object associated with the talk page of this article
1513          * @return Title the object for the talk page
1514          * @access public
1515          */
1516         function getTalkPage() {
1517                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1518         }
1519
1520         /**
1521          * Get a title object associated with the subject page of this
1522          * talk page
1523          *
1524          * @return Title the object for the subject page
1525          * @access public
1526          */
1527         function getSubjectPage() {
1528                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1529         }
1530
1531         /**
1532          * Get an array of Title objects linking to this Title
1533          * Also stores the IDs in the link cache.
1534          *
1535          * @param string $options may be FOR UPDATE
1536          * @return array the Title objects linking here
1537          * @access public
1538          */
1539         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1540                 $linkCache =& LinkCache::singleton();
1541                 $id = $this->getArticleID();
1542
1543                 if ( $options ) {
1544                         $db =& wfGetDB( DB_MASTER );
1545                 } else {
1546                         $db =& wfGetDB( DB_SLAVE );
1547                 }
1548
1549                 $res = $db->select( array( 'page', $table ),
1550                         array( 'page_namespace', 'page_title', 'page_id' ),
1551                         array(
1552                                 "{$prefix}_from=page_id",
1553                                 "{$prefix}_namespace" => $this->getNamespace(),
1554                                 "{$prefix}_title"     => $this->getDbKey() ),
1555                         'Title::getLinksTo',
1556                         $options );
1557
1558                 $retVal = array();
1559                 if ( $db->numRows( $res ) ) {
1560                         while ( $row = $db->fetchObject( $res ) ) {
1561                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1562                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1563                                         $retVal[] = $titleObj;
1564                                 }
1565                         }
1566                 }
1567                 $db->freeResult( $res );
1568                 return $retVal;
1569         }
1570
1571         /**
1572          * Get an array of Title objects using this Title as a template
1573          * Also stores the IDs in the link cache.
1574          *
1575          * @param string $options may be FOR UPDATE
1576          * @return array the Title objects linking here
1577          * @access public
1578          */
1579         function getTemplateLinksTo( $options = '' ) {
1580                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1581         }
1582
1583         /**
1584          * Get an array of Title objects referring to non-existent articles linked from this page
1585          *
1586          * @param string $options may be FOR UPDATE
1587          * @return array the Title objects
1588          * @access public
1589          */
1590         function getBrokenLinksFrom( $options = '' ) {
1591                 if ( $options ) {
1592                         $db =& wfGetDB( DB_MASTER );
1593                 } else {
1594                         $db =& wfGetDB( DB_SLAVE );
1595                 }
1596
1597                 $res = $db->safeQuery(
1598                           "SELECT pl_namespace, pl_title
1599                              FROM !
1600                         LEFT JOIN !
1601                                ON pl_namespace=page_namespace
1602                               AND pl_title=page_title
1603                             WHERE pl_from=?
1604                               AND page_namespace IS NULL
1605                                   !",
1606                         $db->tableName( 'pagelinks' ),
1607                         $db->tableName( 'page' ),
1608                         $this->getArticleId(),
1609                         $options );
1610
1611                 $retVal = array();
1612                 if ( $db->numRows( $res ) ) {
1613                         while ( $row = $db->fetchObject( $res ) ) {
1614                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1615                         }
1616                 }
1617                 $db->freeResult( $res );
1618                 return $retVal;
1619         }
1620
1621
1622         /**
1623          * Get a list of URLs to purge from the Squid cache when this
1624          * page changes
1625          *
1626          * @return array the URLs
1627          * @access public
1628          */
1629         function getSquidURLs() {
1630                 return array(
1631                         $this->getInternalURL(),
1632                         $this->getInternalURL( 'action=history' )
1633                 );
1634         }
1635
1636         /**
1637          * Move this page without authentication
1638          * @param Title &$nt the new page Title
1639          * @access public
1640          */
1641         function moveNoAuth( &$nt ) {
1642                 return $this->moveTo( $nt, false );
1643         }
1644
1645         /**
1646          * Check whether a given move operation would be valid.
1647          * Returns true if ok, or a message key string for an error message
1648          * if invalid. (Scarrrrry ugly interface this.)
1649          * @param Title &$nt the new title
1650          * @param bool $auth indicates whether $wgUser's permissions
1651          *      should be checked
1652          * @return mixed true on success, message name on failure
1653          * @access public
1654          */
1655         function isValidMoveOperation( &$nt, $auth = true ) {
1656                 if( !$this or !$nt ) {
1657                         return 'badtitletext';
1658                 }
1659                 if( $this->equals( $nt ) ) {
1660                         return 'selfmove';
1661                 }
1662                 if( !$this->isMovable() || !$nt->isMovable() ) {
1663                         return 'immobile_namespace';
1664                 }
1665
1666                 $oldid = $this->getArticleID();
1667                 $newid = $nt->getArticleID();
1668
1669                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1670                         return 'articleexists';
1671                 }
1672                 if ( ( '' == $this->getDBkey() ) ||
1673                          ( !$oldid ) ||
1674                      ( '' == $nt->getDBkey() ) ) {
1675                         return 'badarticleerror';
1676                 }
1677
1678                 if ( $auth && (
1679                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1680                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1681                         return 'protectedpage';
1682                 }
1683
1684                 # The move is allowed only if (1) the target doesn't exist, or
1685                 # (2) the target is a redirect to the source, and has no history
1686                 # (so we can undo bad moves right after they're done).
1687
1688                 if ( 0 != $newid ) { # Target exists; check for validity
1689                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1690                                 return 'articleexists';
1691                         }
1692                 }
1693                 return true;
1694         }
1695
1696         /**
1697          * Move a title to a new location
1698          * @param Title &$nt the new title
1699          * @param bool $auth indicates whether $wgUser's permissions
1700          *      should be checked
1701          * @return mixed true on success, message name on failure
1702          * @access public
1703          */
1704         function moveTo( &$nt, $auth = true, $reason = '' ) {
1705                 $err = $this->isValidMoveOperation( $nt, $auth );
1706                 if( is_string( $err ) ) {
1707                         return $err;
1708                 }
1709
1710                 $pageid = $this->getArticleID();
1711                 if( $nt->exists() ) {
1712                         $this->moveOverExistingRedirect( $nt, $reason );
1713                         $pageCountChange = 0;
1714                 } else { # Target didn't exist, do normal move.
1715                         $this->moveToNewTitle( $nt, $reason );
1716                         $pageCountChange = 1;
1717                 }
1718                 $redirid = $this->getArticleID();
1719
1720                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1721                 $dbw =& wfGetDB( DB_MASTER );
1722                 $categorylinks = $dbw->tableName( 'categorylinks' );
1723                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1724                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1725                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1726                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1727
1728                 # Update watchlists
1729
1730                 $oldnamespace = $this->getNamespace() & ~1;
1731                 $newnamespace = $nt->getNamespace() & ~1;
1732                 $oldtitle = $this->getDBkey();
1733                 $newtitle = $nt->getDBkey();
1734
1735                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1736                         WatchedItem::duplicateEntries( $this, $nt );
1737                 }
1738
1739                 # Update search engine
1740                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1741                 $u->doUpdate();
1742                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1743                 $u->doUpdate();
1744
1745                 # Update site_stats
1746                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1747                         # Moved out of main namespace
1748                         # not viewed, edited, removing
1749                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1750                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1751                         # Moved into main namespace
1752                         # not viewed, edited, adding
1753                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1754                 } elseif ( $pageCountChange ) {
1755                         # Added redirect
1756                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1757                 } else{
1758                         $u = false;
1759                 }
1760                 if ( $u ) {
1761                         $u->doUpdate();
1762                 }
1763
1764                 global $wgUser;
1765                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1766                 return true;
1767         }
1768
1769         /**
1770          * Move page to a title which is at present a redirect to the
1771          * source page
1772          *
1773          * @param Title &$nt the page to move to, which should currently
1774          *      be a redirect
1775          * @access private
1776          */
1777         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1778                 global $wgUseSquid, $wgMwRedir;
1779                 $fname = 'Title::moveOverExistingRedirect';
1780                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1781
1782                 if ( $reason ) {
1783                         $comment .= ": $reason";
1784                 }
1785
1786                 $now = wfTimestampNow();
1787                 $rand = wfRandom();
1788                 $newid = $nt->getArticleID();
1789                 $oldid = $this->getArticleID();
1790                 $dbw =& wfGetDB( DB_MASTER );
1791                 $linkCache =& LinkCache::singleton();
1792
1793                 # Delete the old redirect. We don't save it to history since
1794                 # by definition if we've got here it's rather uninteresting.
1795                 # We have to remove it so that the next step doesn't trigger
1796                 # a conflict on the unique namespace+title index...
1797                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1798
1799                 # Save a null revision in the page's history notifying of the move
1800                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1801                 $nullRevId = $nullRevision->insertOn( $dbw );
1802
1803                 # Change the name of the target page:
1804                 $dbw->update( 'page',
1805                         /* SET */ array(
1806                                 'page_touched'   => $dbw->timestamp($now),
1807                                 'page_namespace' => $nt->getNamespace(),
1808                                 'page_title'     => $nt->getDBkey(),
1809                                 'page_latest'    => $nullRevId,
1810                         ),
1811                         /* WHERE */ array( 'page_id' => $oldid ),
1812                         $fname
1813                 );
1814                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1815
1816                 # Recreate the redirect, this time in the other direction.
1817                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1818                 $redirectArticle = new Article( $this );
1819                 $newid = $redirectArticle->insertOn( $dbw );
1820                 $redirectRevision = new Revision( array(
1821                         'page'    => $newid,
1822                         'comment' => $comment,
1823                         'text'    => $redirectText ) );
1824                 $revid = $redirectRevision->insertOn( $dbw );
1825                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1826                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1827
1828                 # Log the move
1829                 $log = new LogPage( 'move' );
1830                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1831
1832                 # Now, we record the link from the redirect to the new title.
1833                 # It should have no other outgoing links...
1834                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1835                 $dbw->insert( 'pagelinks',
1836                         array(
1837                                 'pl_from'      => $newid,
1838                                 'pl_namespace' => $nt->getNamespace(),
1839                                 'pl_title'     => $nt->getDbKey() ),
1840                         $fname );
1841
1842                 # Purge squid
1843                 if ( $wgUseSquid ) {
1844                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1845                         $u = new SquidUpdate( $urls );
1846                         $u->doUpdate();
1847                 }
1848         }
1849
1850         /**
1851          * Move page to non-existing title.
1852          * @param Title &$nt the new Title
1853          * @access private
1854          */
1855         function moveToNewTitle( &$nt, $reason = '' ) {
1856                 global $wgUseSquid;
1857                 global $wgMwRedir;
1858                 $fname = 'MovePageForm::moveToNewTitle';
1859                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1860                 if ( $reason ) {
1861                         $comment .= ": $reason";
1862                 }
1863
1864                 $newid = $nt->getArticleID();
1865                 $oldid = $this->getArticleID();
1866                 $dbw =& wfGetDB( DB_MASTER );
1867                 $now = $dbw->timestamp();
1868                 $rand = wfRandom();
1869                 $linkCache =& LinkCache::singleton();
1870
1871                 # Save a null revision in the page's history notifying of the move
1872                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1873                 $nullRevId = $nullRevision->insertOn( $dbw );
1874
1875                 # Rename cur entry
1876                 $dbw->update( 'page',
1877                         /* SET */ array(
1878                                 'page_touched'   => $now,
1879                                 'page_namespace' => $nt->getNamespace(),
1880                                 'page_title'     => $nt->getDBkey(),
1881                                 'page_latest'    => $nullRevId,
1882                         ),
1883                         /* WHERE */ array( 'page_id' => $oldid ),
1884                         $fname
1885                 );
1886
1887                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1888
1889                 # Insert redirect
1890                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1891                 $redirectArticle = new Article( $this );
1892                 $newid = $redirectArticle->insertOn( $dbw );
1893                 $redirectRevision = new Revision( array(
1894                         'page'    => $newid,
1895                         'comment' => $comment,
1896                         'text'    => $redirectText ) );
1897                 $revid = $redirectRevision->insertOn( $dbw );
1898                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1899                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1900
1901                 # Log the move
1902                 $log = new LogPage( 'move' );
1903                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1904
1905                 # Purge caches as per article creation
1906                 Article::onArticleCreate( $nt );
1907
1908                 # Record the just-created redirect's linking to the page
1909                 $dbw->insert( 'pagelinks',
1910                         array(
1911                                 'pl_from'      => $newid,
1912                                 'pl_namespace' => $nt->getNamespace(),
1913                                 'pl_title'     => $nt->getDBkey() ),
1914                         $fname );
1915
1916                 # Non-existent target may have had broken links to it; these must
1917                 # now be touched to update link coloring.
1918                 $nt->touchLinks();
1919
1920                 # Purge old title from squid
1921                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1922                 $titles = $nt->getLinksTo();
1923                 if ( $wgUseSquid ) {
1924                         $urls = $this->getSquidURLs();
1925                         foreach ( $titles as $linkTitle ) {
1926                                 $urls[] = $linkTitle->getInternalURL();
1927                         }
1928                         $u = new SquidUpdate( $urls );
1929                         $u->doUpdate();
1930                 }
1931         }
1932
1933         /**
1934          * Checks if $this can be moved to a given Title
1935          * - Selects for update, so don't call it unless you mean business
1936          *
1937          * @param Title &$nt the new title to check
1938          * @access public
1939          */
1940         function isValidMoveTarget( $nt ) {
1941
1942                 $fname = 'Title::isValidMoveTarget';
1943                 $dbw =& wfGetDB( DB_MASTER );
1944
1945                 # Is it a redirect?
1946                 $id  = $nt->getArticleID();
1947                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1948                         array( 'page_is_redirect','old_text','old_flags' ),
1949                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1950                         $fname, 'FOR UPDATE' );
1951
1952                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1953                         # Not a redirect
1954                         return false;
1955                 }
1956                 $text = Revision::getRevisionText( $obj );
1957
1958                 # Does the redirect point to the source?
1959                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1960                         $redirTitle = Title::newFromText( $m[1] );
1961                         if( !is_object( $redirTitle ) ||
1962                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1963                                 return false;
1964                         }
1965                 } else {
1966                         # Fail safe
1967                         return false;
1968                 }
1969
1970                 # Does the article have a history?
1971                 $row = $dbw->selectRow( array( 'page', 'revision'),
1972                         array( 'rev_id' ),
1973                         array( 'page_namespace' => $nt->getNamespace(),
1974                                 'page_title' => $nt->getDBkey(),
1975                                 'page_id=rev_page AND page_latest != rev_id'
1976                         ), $fname, 'FOR UPDATE'
1977                 );
1978
1979                 # Return true if there was no history
1980                 return $row === false;
1981         }
1982
1983         /**
1984          * Create a redirect; fails if the title already exists; does
1985          * not notify RC
1986          *
1987          * @param Title $dest the destination of the redirect
1988          * @param string $comment the comment string describing the move
1989          * @return bool true on success
1990          * @access public
1991          */
1992         function createRedirect( $dest, $comment ) {
1993                 if ( $this->getArticleID() ) {
1994                         return false;
1995                 }
1996
1997                 $fname = 'Title::createRedirect';
1998                 $dbw =& wfGetDB( DB_MASTER );
1999
2000                 $article = new Article( $this );
2001                 $newid = $article->insertOn( $dbw );
2002                 $revision = new Revision( array(
2003                         'page'      => $newid,
2004                         'comment'   => $comment,
2005                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2006                         ) );
2007                 $revisionId = $revision->insertOn( $dbw );
2008                 $article->updateRevisionOn( $dbw, $revision, 0 );
2009
2010                 # Link table
2011                 $dbw->insert( 'pagelinks',
2012                         array(
2013                                 'pl_from'      => $newid,
2014                                 'pl_namespace' => $dest->getNamespace(),
2015                                 'pl_title'     => $dest->getDbKey()
2016                         ), $fname
2017                 );
2018
2019                 Article::onArticleCreate( $this );
2020                 return true;
2021         }
2022
2023         /**
2024          * Get categories to which this Title belongs and return an array of
2025          * categories' names.
2026          *
2027          * @return array an array of parents in the form:
2028          *      $parent => $currentarticle
2029          * @access public
2030          */
2031         function getParentCategories() {
2032                 global $wgContLang;
2033
2034                 $titlekey = $this->getArticleId();
2035                 $dbr =& wfGetDB( DB_SLAVE );
2036                 $categorylinks = $dbr->tableName( 'categorylinks' );
2037
2038                 # NEW SQL
2039                 $sql = "SELECT * FROM $categorylinks"
2040                      ." WHERE cl_from='$titlekey'"
2041                          ." AND cl_from <> '0'"
2042                          ." ORDER BY cl_sortkey";
2043
2044                 $res = $dbr->query ( $sql ) ;
2045
2046                 if($dbr->numRows($res) > 0) {
2047                         while ( $x = $dbr->fetchObject ( $res ) )
2048                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2049                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2050                         $dbr->freeResult ( $res ) ;
2051                 } else {
2052                         $data = '';
2053                 }
2054                 return $data;
2055         }
2056
2057         /**
2058          * Get a tree of parent categories
2059          * @param array $children an array with the children in the keys, to check for circular refs
2060          * @return array
2061          * @access public
2062          */
2063         function getParentCategoryTree( $children = array() ) {
2064                 $parents = $this->getParentCategories();
2065
2066                 if($parents != '') {
2067                         foreach($parents as $parent => $current) {
2068                                 if ( array_key_exists( $parent, $children ) ) {
2069                                         # Circular reference
2070                                         $stack[$parent] = array();
2071                                 } else {
2072                                         $nt = Title::newFromText($parent);
2073                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2074                                 }
2075                         }
2076                         return $stack;
2077                 } else {
2078                         return array();
2079                 }
2080         }
2081
2082
2083         /**
2084          * Get an associative array for selecting this title from
2085          * the "page" table
2086          *
2087          * @return array
2088          * @access public
2089          */
2090         function pageCond() {
2091                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2092         }
2093
2094         /**
2095          * Get the revision ID of the previous revision
2096          *
2097          * @param integer $revision  Revision ID. Get the revision that was before this one.
2098          * @return interger $oldrevision|false
2099          */
2100         function getPreviousRevisionID( $revision ) {
2101                 $dbr =& wfGetDB( DB_SLAVE );
2102                 return $dbr->selectField( 'revision', 'rev_id',
2103                         'rev_page=' . intval( $this->getArticleId() ) .
2104                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2105         }
2106
2107         /**
2108          * Get the revision ID of the next revision
2109          *
2110          * @param integer $revision  Revision ID. Get the revision that was after this one.
2111          * @return interger $oldrevision|false
2112          */
2113         function getNextRevisionID( $revision ) {
2114                 $dbr =& wfGetDB( DB_SLAVE );
2115                 return $dbr->selectField( 'revision', 'rev_id',
2116                         'rev_page=' . intval( $this->getArticleId() ) .
2117                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2118         }
2119
2120         /**
2121          * Compare with another title.
2122          *
2123          * @param Title $title
2124          * @return bool
2125          */
2126         function equals( $title ) {
2127                 // Note: === is necessary for proper matching of number-like titles.
2128                 return $this->getInterwiki() === $title->getInterwiki()
2129                         && $this->getNamespace() == $title->getNamespace()
2130                         && $this->getDbkey() === $title->getDbkey();
2131         }
2132
2133         /**
2134          * Check if page exists
2135          * @return bool
2136          */
2137         function exists() {
2138                 return $this->getArticleId() != 0;
2139         }
2140
2141         /**
2142          * Should a link should be displayed as a known link, just based on its title?
2143          *
2144          * Currently, a self-link with a fragment and special pages are in
2145          * this category. Special pages never exist in the database.
2146          */
2147         function isAlwaysKnown() {
2148                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2149                   || NS_SPECIAL == $this->mNamespace;
2150         }
2151
2152         /**
2153          * Update page_touched timestamps on pages linking to this title.
2154          * In principal, this could be backgrounded and could also do squid
2155          * purging.
2156          */
2157         function touchLinks() {
2158                 $fname = 'Title::touchLinks';
2159
2160                 $dbw =& wfGetDB( DB_MASTER );
2161
2162                 $res = $dbw->select( 'pagelinks',
2163                         array( 'pl_from' ),
2164                         array(
2165                                 'pl_namespace' => $this->getNamespace(),
2166                                 'pl_title'     => $this->getDbKey() ),
2167                         $fname );
2168
2169                 $toucharr = array();
2170                 while( $row = $dbw->fetchObject( $res ) ) {
2171                         $toucharr[] = $row->pl_from;
2172                 }
2173                 $dbw->freeResult( $res );
2174
2175                 if( $this->getNamespace() == NS_CATEGORY ) {
2176                         // Categories show up in a separate set of links as well
2177                         $res = $dbw->select( 'categorylinks',
2178                                 array( 'cl_from' ),
2179                                 array( 'cl_to' => $this->getDbKey() ),
2180                                 $fname );
2181                         while( $row = $dbw->fetchObject( $res ) ) {
2182                                 $toucharr[] = $row->cl_from;
2183                         }
2184                         $dbw->freeResult( $res );
2185                 }
2186
2187                 if (!count($toucharr))
2188                         return;
2189                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2190                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2191         }
2192
2193         function trackbackURL() {
2194                 global $wgTitle, $wgScriptPath, $wgServer;
2195
2196                 return "$wgServer$wgScriptPath/trackback.php?article="
2197                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2198         }
2199
2200         function trackbackRDF() {
2201                 $url = htmlspecialchars($this->getFullURL());
2202                 $title = htmlspecialchars($this->getText());
2203                 $tburl = $this->trackbackURL();
2204
2205                 return "
2206 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2207          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2208          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2209 <rdf:Description
2210    rdf:about=\"$url\"
2211    dc:identifier=\"$url\"
2212    dc:title=\"$title\"
2213    trackback:ping=\"$tburl\" />
2214 </rdf:RDF>";
2215         }
2216
2217         /**
2218          * Generate strings used for xml 'id' names in monobook tabs
2219          * @return string
2220          */
2221         function getNamespaceKey() {
2222                 switch ($this->getNamespace()) {
2223                         case NS_MAIN:
2224                         case NS_TALK:
2225                                 return 'nstab-main';
2226                         case NS_USER:
2227                         case NS_USER_TALK:
2228                                 return 'nstab-user';
2229                         case NS_MEDIA:
2230                                 return 'nstab-media';
2231                         case NS_SPECIAL:
2232                                 return 'nstab-special';
2233                         case NS_PROJECT:
2234                         case NS_PROJECT_TALK:
2235                                 return 'nstab-wp';
2236                         case NS_IMAGE:
2237                         case NS_IMAGE_TALK:
2238                                 return 'nstab-image';
2239                         case NS_MEDIAWIKI:
2240                         case NS_MEDIAWIKI_TALK:
2241                                 return 'nstab-mediawiki';
2242                         case NS_TEMPLATE:
2243                         case NS_TEMPLATE_TALK:
2244                                 return 'nstab-template';
2245                         case NS_HELP:
2246                         case NS_HELP_TALK:
2247                                 return 'nstab-help';
2248                         case NS_CATEGORY:
2249                         case NS_CATEGORY_TALK:
2250                                 return 'nstab-category';
2251                         default:
2252                                 return 'nstab-' . strtolower( $this->getSubjectNsText() );
2253                 }
2254         }
2255 }
2256 ?>