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