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