includes/Title.php

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