includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 $wgTitleInterwikiCache = array();
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 /**
  22  * Title class
  23  * - Represents a title, which may contain an interwiki designation or namespace
  24  * - Can fetch various kinds of data from the database, albeit inefficiently.
  25  *
  26  * @package MediaWiki
  27  */
  28 class Title {
  29         /**
  30          * All member variables should be considered private
  31          * Please use the accessor functions
  32          */
  33
  34          /**#@+
  35          * @access private
  36          */
  37
  38         var $mTextform;           # Text form (spaces not underscores) of the main part
  39         var $mUrlform;            # URL-encoded form of the main part
  40         var $mDbkeyform;          # Main part with underscores
  41         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  42         var $mInterwiki;          # Interwiki prefix (or null string)
  43         var $mFragment;           # Title fragment (i.e. the bit after the #)
  44         var $mArticleID;          # Article ID, fetched from the link cache on demand
  45         var $mLatestID;         # ID of most recent revision
  46         var $mRestrictions;       # Array of groups allowed to edit this article
  47                               # Only null or "sysop" are supported
  48         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  49         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  50         var $mDefaultNamespace;   # Namespace index when there is no namespace
  51                               # Zero except in {{transclusion}} tags
  52         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  53         /**#@-*/
  54
  55
  56         /**
  57          * Constructor
  58          * @access private
  59          */
  60         /* private */ function Title() {
  61                 $this->mInterwiki = $this->mUrlform =
  62                 $this->mTextform = $this->mDbkeyform = '';
  63                 $this->mArticleID = -1;
  64                 $this->mNamespace = NS_MAIN;
  65                 $this->mRestrictionsLoaded = false;
  66                 $this->mRestrictions = array();
  67                 # Dont change the following, NS_MAIN is hardcoded in several place
  68                 # See bug #696
  69                 $this->mDefaultNamespace = NS_MAIN;
  70                 $this->mWatched = NULL;
  71                 $this->mLatestID = false;
  72         }
  73
  74         /**
  75          * Create a new Title from a prefixed DB key
  76          * @param string $key The database key, which has underscores
  77          *      instead of spaces, possibly including namespace and
  78          *      interwiki prefixes
  79          * @return Title the new object, or NULL on an error
  80          * @static
  81          * @access public
  82          */
  83         /* static */ function newFromDBkey( $key ) {
  84                 $t = new Title();
  85                 $t->mDbkeyform = $key;
  86                 if( $t->secureAndSplit() )
  87                         return $t;
  88                 else
  89                         return NULL;
  90         }
  91
  92         /**
  93          * Create a new Title from text, such as what one would
  94          * find in a link. Decodes any HTML entities in the text.
  95          *
  96          * @param string $text the link text; spaces, prefixes,
  97          *      and an initial ':' indicating the main namespace
  98          *      are accepted
  99          * @param int $defaultNamespace the namespace to use if
 100          *      none is specified by a prefix
 101          * @return Title the new object, or NULL on an error
 102          * @static
 103          * @access public
 104          */
 105         function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 106                 $fname = 'Title::newFromText';
 107                 wfProfileIn( $fname );
 108
 109                 if( is_object( $text ) ) {
 110                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 111                 }
 112
 113                 /**
 114                  * Wiki pages often contain multiple links to the same page.
 115                  * Title normalization and parsing can become expensive on
 116                  * pages with many links, so we can save a little time by
 117                  * caching them.
 118                  *
 119                  * In theory these are value objects and won't get changed...
 120                  */
 121                 static $titleCache = array();
 122                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 123                         wfProfileOut( $fname );
 124                         return $titleCache[$text];
 125                 }
 126
 127                 /**
 128                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 129                  */
 130                 $filteredText = Sanitizer::decodeCharReferences( $text );
 131
 132                 $t =& new Title();
 133                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 134                 $t->mDefaultNamespace = $defaultNamespace;
 135
 136                 if( $t->secureAndSplit() ) {
 137                         if( $defaultNamespace == NS_MAIN ) {
 138                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 139                                         # Avoid memory leaks on mass operations...
 140                                         $titleCache = array();
 141                                 }
 142                                 $titleCache[$text] =& $t;
 143                         }
 144                         wfProfileOut( $fname );
 145                         return $t;
 146                 } else {
 147                         wfProfileOut( $fname );
 148                         $ret = NULL;
 149                         return $ret;
 150                 }
 151         }
 152
 153         /**
 154          * Create a new Title from URL-encoded text. Ensures that
 155          * the given title's length does not exceed the maximum.
 156          * @param string $url the title, as might be taken from a URL
 157          * @return Title the new object, or NULL on an error
 158          * @static
 159          * @access public
 160          */
 161         function newFromURL( $url ) {
 162                 global $wgLang, $wgServer;
 163                 $t = new Title();
 164
 165                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 166                 # but some URLs used it as a space replacement and they still come
 167                 # from some external search tools.
 168                 $s = str_replace( '+', ' ', $url );
 169
 170                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 171                 if( $t->secureAndSplit() ) {
 172                         return $t;
 173                 } else {
 174                         return NULL;
 175                 }
 176         }
 177
 178         /**
 179          * Create a new Title from an article ID
 180          *
 181          * @todo This is inefficiently implemented, the page row is requested
 182          *       but not used for anything else
 183          *
 184          * @param int $id the page_id corresponding to the Title to create
 185          * @return Title the new object, or NULL on an error
 186          * @access public
 187          * @static
 188          */
 189         function newFromID( $id ) {
 190                 $fname = 'Title::newFromID';
 191                 $dbr =& wfGetDB( DB_SLAVE );
 192                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 193                         array( 'page_id' => $id ), $fname );
 194                 if ( $row !== false ) {
 195                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 196                 } else {
 197                         $title = NULL;
 198                 }
 199                 return $title;
 200         }
 201
 202         /**
 203          * Create a new Title from a namespace index and a DB key.
 204          * It's assumed that $ns and $title are *valid*, for instance when
 205          * they came directly from the database or a special page name.
 206          * For convenience, spaces are converted to underscores so that
 207          * eg user_text fields can be used directly.
 208          *
 209          * @param int $ns the namespace of the article
 210          * @param string $title the unprefixed database key form
 211          * @return Title the new object
 212          * @static
 213          * @access public
 214          */
 215         function &makeTitle( $ns, $title ) {
 216                 $t =& new Title();
 217                 $t->mInterwiki = '';
 218                 $t->mFragment = '';
 219                 $t->mNamespace = intval( $ns );
 220                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 221                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 222                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 223                 $t->mTextform = str_replace( '_', ' ', $title );
 224                 return $t;
 225         }
 226
 227         /**
 228          * Create a new Title frrom a namespace index and a DB key.
 229          * The parameters will be checked for validity, which is a bit slower
 230          * than makeTitle() but safer for user-provided data.
 231          *
 232          * @param int $ns the namespace of the article
 233          * @param string $title the database key form
 234          * @return Title the new object, or NULL on an error
 235          * @static
 236          * @access public
 237          */
 238         function makeTitleSafe( $ns, $title ) {
 239                 $t = new Title();
 240                 $t->mDbkeyform = Title::makeName( $ns, $title );
 241                 if( $t->secureAndSplit() ) {
 242                         return $t;
 243                 } else {
 244                         return NULL;
 245                 }
 246         }
 247
 248         /**
 249          * Create a new Title for the Main Page
 250          *
 251          * @static
 252          * @return Title the new object
 253          * @access public
 254          */
 255         function newMainPage() {
 256                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 257         }
 258
 259         /**
 260          * Create a new Title for a redirect
 261          * @param string $text the redirect title text
 262          * @return Title the new object, or NULL if the text is not a
 263          *      valid redirect
 264          * @static
 265          * @access public
 266          */
 267         function newFromRedirect( $text ) {
 268                 global $wgMwRedir;
 269                 $rt = NULL;
 270                 if ( $wgMwRedir->matchStart( $text ) ) {
 271                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 272                                 # categories are escaped using : for example one can enter:
 273                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 274                                 if ( substr($m[1],0,1) == ':') {
 275                                         # We don't want to keep the ':'
 276                                         $m[1] = substr( $m[1], 1 );
 277                                 }
 278
 279                                 $rt = Title::newFromText( $m[1] );
 280                                 # Disallow redirects to Special:Userlogout
 281                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 282                                         $rt = NULL;
 283                                 }
 284                         }
 285                 }
 286                 return $rt;
 287         }
 288
 289 #----------------------------------------------------------------------------
 290 #       Static functions
 291 #----------------------------------------------------------------------------
 292
 293         /**
 294          * Get the prefixed DB key associated with an ID
 295          * @param int $id the page_id of the article
 296          * @return Title an object representing the article, or NULL
 297          *      if no such article was found
 298          * @static
 299          * @access public
 300          */
 301         function nameOf( $id ) {
 302                 $fname = 'Title::nameOf';
 303                 $dbr =& wfGetDB( DB_SLAVE );
 304
 305                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 306                 if ( $s === false ) { return NULL; }
 307
 308                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 309                 return $n;
 310         }
 311
 312         /**
 313          * Get a regex character class describing the legal characters in a link
 314          * @return string the list of characters, not delimited
 315          * @static
 316          * @access public
 317          */
 318         function legalChars() {
 319                 # Missing characters:
 320                 #  * []|# Needed for link syntax
 321                 #  * % and + are corrupted by Apache when they appear in the path
 322                 #
 323                 # % seems to work though
 324                 #
 325                 # The problem with % is that URLs are double-unescaped: once by Apache's
 326                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 327                 # Our code does not double-escape to compensate for this, indeed double escaping
 328                 # would break if the double-escaped title was passed in the query string
 329                 # rather than the path. This is a minor security issue because articles can be
 330                 # created such that they are hard to view or edit. -- TS
 331                 #
 332                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 333                 # this breaks interlanguage links
 334
 335                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 336                 return $set;
 337         }
 338
 339         /**
 340          * Get a string representation of a title suitable for
 341          * including in a search index
 342          *
 343          * @param int $ns a namespace index
 344          * @param string $title text-form main part
 345          * @return string a stripped-down title string ready for the
 346          *      search index
 347          */
 348         /* static */ function indexTitle( $ns, $title ) {
 349                 global $wgDBminWordLen, $wgContLang;
 350                 require_once( 'SearchEngine.php' );
 351
 352                 $lc = SearchEngine::legalSearchChars() . '&#;';
 353                 $t = $wgContLang->stripForSearch( $title );
 354                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 355                 $t = strtolower( $t );
 356
 357                 # Handle 's, s'
 358                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 359                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 360
 361                 $t = preg_replace( "/\\s+/", ' ', $t );
 362
 363                 if ( $ns == NS_IMAGE ) {
 364                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 365                 }
 366                 return trim( $t );
 367         }
 368
 369         /*
 370          * Make a prefixed DB key from a DB key and a namespace index
 371          * @param int $ns numerical representation of the namespace
 372          * @param string $title the DB key form the title
 373          * @return string the prefixed form of the title
 374          */
 375         /* static */ function makeName( $ns, $title ) {
 376                 global $wgContLang;
 377
 378                 $n = $wgContLang->getNsText( $ns );
 379                 return $n == '' ? $title : "$n:$title";
 380         }
 381
 382         /**
 383          * Returns the URL associated with an interwiki prefix
 384          * @param string $key the interwiki prefix (e.g. "MeatBall")
 385          * @return the associated URL, containing "$1", which should be
 386          *      replaced by an article title
 387          * @static (arguably)
 388          * @access public
 389          */
 390         function getInterwikiLink( $key, $transludeonly = false ) {
 391                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 392                 $fname = 'Title::getInterwikiLink';
 393
 394                 wfProfileIn( $fname );
 395
 396                 $k = $wgDBname.':interwiki:'.$key;
 397                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 398                         wfProfileOut( $fname );
 399                         return $wgTitleInterwikiCache[$k]->iw_url;
 400                 }
 401
 402                 $s = $wgMemc->get( $k );
 403                 # Ignore old keys with no iw_local
 404                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 405                         $wgTitleInterwikiCache[$k] = $s;
 406                         wfProfileOut( $fname );
 407                         return $s->iw_url;
 408                 }
 409
 410                 $dbr =& wfGetDB( DB_SLAVE );
 411                 $res = $dbr->select( 'interwiki',
 412                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 413                         array( 'iw_prefix' => $key ), $fname );
 414                 if( !$res ) {
 415                         wfProfileOut( $fname );
 416                         return '';
 417                 }
 418
 419                 $s = $dbr->fetchObject( $res );
 420                 if( !$s ) {
 421                         # Cache non-existence: create a blank object and save it to memcached
 422                         $s = (object)false;
 423                         $s->iw_url = '';
 424                         $s->iw_local = 0;
 425                         $s->iw_trans = 0;
 426                 }
 427                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 428                 $wgTitleInterwikiCache[$k] = $s;
 429
 430                 wfProfileOut( $fname );
 431                 return $s->iw_url;
 432         }
 433
 434         /**
 435          * Determine whether the object refers to a page within
 436          * this project.
 437          *
 438          * @return bool TRUE if this is an in-project interwiki link
 439          *      or a wikilink, FALSE otherwise
 440          * @access public
 441          */
 442         function isLocal() {
 443                 global $wgTitleInterwikiCache, $wgDBname;
 444
 445                 if ( $this->mInterwiki != '' ) {
 446                         # Make sure key is loaded into cache
 447                         $this->getInterwikiLink( $this->mInterwiki );
 448                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 449                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 450                 } else {
 451                         return true;
 452                 }
 453         }
 454
 455         /**
 456          * Determine whether the object refers to a page within
 457          * this project and is transcludable.
 458          *
 459          * @return bool TRUE if this is transcludable
 460          * @access public
 461          */
 462         function isTrans() {
 463                 global $wgTitleInterwikiCache, $wgDBname;
 464
 465                 if ($this->mInterwiki == '' || !$this->isLocal())
 466                         return false;
 467                 # Make sure key is loaded into cache
 468                 $this->getInterwikiLink( $this->mInterwiki );
 469                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 470                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 471         }
 472
 473         /**
 474          * Update the page_touched field for an array of title objects
 475          * @todo Inefficient unless the IDs are already loaded into the
 476          *      link cache
 477          * @param array $titles an array of Title objects to be touched
 478          * @param string $timestamp the timestamp to use instead of the
 479          *      default current time
 480          * @static
 481          * @access public
 482          */
 483         function touchArray( $titles, $timestamp = '' ) {
 484                 global $wgUseFileCache;
 485
 486                 if ( count( $titles ) == 0 ) {
 487                         return;
 488                 }
 489                 $dbw =& wfGetDB( DB_MASTER );
 490                 if ( $timestamp == '' ) {
 491                         $timestamp = $dbw->timestamp();
 492                 }
 493                 $page = $dbw->tableName( 'page' );
 494                 /*
 495                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 496                 $first = true;
 497
 498                 foreach ( $titles as $title ) {
 499                         if ( $wgUseFileCache ) {
 500                                 $cm = new CacheManager($title);
 501                                 @unlink($cm->fileCacheName());
 502                         }
 503
 504                         if ( ! $first ) {
 505                                 $sql .= ',';
 506                         }
 507                         $first = false;
 508                         $sql .= $title->getArticleID();
 509                 }
 510                 $sql .= ')';
 511                 if ( ! $first ) {
 512                         $dbw->query( $sql, 'Title::touchArray' );
 513                 }
 514                 */
 515                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 516                 // do them in small chunks:
 517                 $fname = 'Title::touchArray';
 518                 foreach( $titles as $title ) {
 519                         $dbw->update( 'page',
 520                                 array( 'page_touched' => $timestamp ),
 521                                 array(
 522                                         'page_namespace' => $title->getNamespace(),
 523                                         'page_title'     => $title->getDBkey() ),
 524                                 $fname );
 525                 }
 526         }
 527
 528 #----------------------------------------------------------------------------
 529 #       Other stuff
 530 #----------------------------------------------------------------------------
 531
 532         /** Simple accessors */
 533         /**
 534          * Get the text form (spaces not underscores) of the main part
 535          * @return string
 536          * @access public
 537          */
 538         function getText() { return $this->mTextform; }
 539         /**
 540          * Get the URL-encoded form of the main part
 541          * @return string
 542          * @access public
 543          */
 544         function getPartialURL() { return $this->mUrlform; }
 545         /**
 546          * Get the main part with underscores
 547          * @return string
 548          * @access public
 549          */
 550         function getDBkey() { return $this->mDbkeyform; }
 551         /**
 552          * Get the namespace index, i.e. one of the NS_xxxx constants
 553          * @return int
 554          * @access public
 555          */
 556         function getNamespace() { return $this->mNamespace; }
 557         /**
 558          * Get the interwiki prefix (or null string)
 559          * @return string
 560          * @access public
 561          */
 562         function getInterwiki() { return $this->mInterwiki; }
 563         /**
 564          * Get the Title fragment (i.e. the bit after the #)
 565          * @return string
 566          * @access public
 567          */
 568         function getFragment() { return $this->mFragment; }
 569         /**
 570          * Get the default namespace index, for when there is no namespace
 571          * @return int
 572          * @access public
 573          */
 574         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 575
 576         /**
 577          * Get title for search index
 578          * @return string a stripped-down title string ready for the
 579          *      search index
 580          */
 581         function getIndexTitle() {
 582                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 583         }
 584
 585         /**
 586          * Get the prefixed database key form
 587          * @return string the prefixed title, with underscores and
 588          *      any interwiki and namespace prefixes
 589          * @access public
 590          */
 591         function getPrefixedDBkey() {
 592                 $s = $this->prefix( $this->mDbkeyform );
 593                 $s = str_replace( ' ', '_', $s );
 594                 return $s;
 595         }
 596
 597         /**
 598          * Get the prefixed title with spaces.
 599          * This is the form usually used for display
 600          * @return string the prefixed title, with spaces
 601          * @access public
 602          */
 603         function getPrefixedText() {
 604                 global $wgContLang;
 605                 if ( empty( $this->mPrefixedText ) ) {
 606                         $s = $this->prefix( $this->mTextform );
 607                         $s = str_replace( '_', ' ', $s );
 608                         $this->mPrefixedText = $s;
 609                 }
 610                 return $this->mPrefixedText;
 611         }
 612
 613         /**
 614          * Get the prefixed title with spaces, plus any fragment
 615          * (part beginning with '#')
 616          * @return string the prefixed title, with spaces and
 617          *      the fragment, including '#'
 618          * @access public
 619          */
 620         function getFullText() {
 621                 global $wgContLang;
 622                 $text = $this->getPrefixedText();
 623                 if( '' != $this->mFragment ) {
 624                         $text .= '#' . $this->mFragment;
 625                 }
 626                 return $text;
 627         }
 628
 629         /**
 630          * Get a URL-encoded title (not an actual URL) including interwiki
 631          * @return string the URL-encoded form
 632          * @access public
 633          */
 634         function getPrefixedURL() {
 635                 $s = $this->prefix( $this->mDbkeyform );
 636                 $s = str_replace( ' ', '_', $s );
 637
 638                 $s = wfUrlencode ( $s ) ;
 639
 640                 # Cleaning up URL to make it look nice -- is this safe?
 641                 $s = str_replace( '%28', '(', $s );
 642                 $s = str_replace( '%29', ')', $s );
 643
 644                 return $s;
 645         }
 646
 647         /**
 648          * Get a real URL referring to this title, with interwiki link and
 649          * fragment
 650          *
 651          * @param string $query an optional query string, not used
 652          *      for interwiki links
 653          * @return string the URL
 654          * @access public
 655          */
 656         function getFullURL( $query = '' ) {
 657                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 658
 659                 if ( '' == $this->mInterwiki ) {
 660                         return $wgServer . $this->getLocalUrl( $query );
 661                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 662                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 663                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 664                 } else {
 665                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 666                 }
 667
 668                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 669                 if ( '' != $namespace ) {
 670                         # Can this actually happen? Interwikis shouldn't be parsed.
 671                         $namespace .= ':';
 672                 }
 673                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 674                 if( $query != '' ) {
 675                         if( false === strpos( $url, '?' ) ) {
 676                                 $url .= '?';
 677                         } else {
 678                                 $url .= '&';
 679                         }
 680                         $url .= $query;
 681                 }
 682                 if ( '' != $this->mFragment ) {
 683                         $url .= '#' . $this->mFragment;
 684                 }
 685                 return $url;
 686         }
 687
 688         /**
 689          * Get a relative directory for putting an HTML version of this article into
 690          */
 691         function getHashedDirectory() {
 692                 global $wgMakeDumpLinks, $wgInputEncoding;
 693                 $dbkey = $this->getDBkey();
 694
 695                 # Split into characters
 696                 if ( $wgInputEncoding == 'UTF-8' ) {
 697                         preg_match_all( '/./us', $dbkey, $m );
 698                 } else {
 699                         preg_match_all( '/./s', $dbkey, $m );
 700                 }
 701                 $chars = $m[0];
 702                 $length = count( $chars );
 703                 $dir = '';
 704
 705                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 706                         if ( $i ) {
 707                                 $dir .= '/';
 708                         }
 709                         if ( $i >= $length ) {
 710                                 $dir .= '_';
 711                         } elseif ( ord( $chars[$i] ) > 32 ) {
 712                                 $dir .= strtolower( $chars[$i] );
 713                         } else {
 714                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 715                         }
 716                 }
 717                 return $dir;
 718         }
 719
 720         function getHashedFilename() {
 721                 $dbkey = $this->getPrefixedDBkey();
 722                 $mainPage = Title::newMainPage();
 723                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 724                         return 'index.html';
 725                 }
 726
 727                 $dir = $this->getHashedDirectory();
 728
 729                 # Replace illegal charcters for Windows paths with underscores
 730                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 731
 732                 # Work out lower case form. We assume we're on a system with case-insensitive
 733                 # filenames, so unless the case is of a special form, we have to disambiguate
 734                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 735
 736                 # Make it mostly unique
 737                 if ( $lowerCase != $friendlyName  ) {
 738                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 739                 }
 740                 # Handle colon specially by replacing it with tilde
 741                 # Thus we reduce the number of paths with hashes appended
 742                 $friendlyName = str_replace( ':', '~', $friendlyName );
 743                 return "$dir/$friendlyName.html";
 744         }
 745
 746         /**
 747          * Get a URL with no fragment or server name.  If this page is generated
 748          * with action=render, $wgServer is prepended.
 749          * @param string $query an optional query string; if not specified,
 750          *      $wgArticlePath will be used.
 751          * @return string the URL
 752          * @access public
 753          */
 754         function getLocalURL( $query = '' ) {
 755                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $wgServer, $action;
 756
 757                 if ( $this->isExternal() ) {
 758                         return $this->getFullURL();
 759                 }
 760
 761                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 762                 if ( $wgMakeDumpLinks ) {
 763                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 764                 } elseif ( $query == '' ) {
 765                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 766                 } else {
 767                         global $wgActionPaths;
 768                         if( !empty( $wgActionPaths ) &&
 769                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 770                                 $action = urldecode( $matches[2] );
 771                                 if( isset( $wgActionPaths[$action] ) ) {
 772                                         $query = $matches[1];
 773                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 774                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 775                                         if( $query != '' ) $url .= '?' . $query;
 776                                         return $url;
 777                                 }
 778                         }
 779                         if ( $query == '-' ) {
 780                                 $query = '';
 781                         }
 782                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 783                 }
 784
 785                 if ($action == 'render')
 786                         return $wgServer . $url;
 787                 else
 788                         return $url;
 789         }
 790
 791         /**
 792          * Get an HTML-escaped version of the URL form, suitable for
 793          * using in a link, without a server name or fragment
 794          * @param string $query an optional query string
 795          * @return string the URL
 796          * @access public
 797          */
 798         function escapeLocalURL( $query = '' ) {
 799                 return htmlspecialchars( $this->getLocalURL( $query ) );
 800         }
 801
 802         /**
 803          * Get an HTML-escaped version of the URL form, suitable for
 804          * using in a link, including the server name and fragment
 805          *
 806          * @return string the URL
 807          * @param string $query an optional query string
 808          * @access public
 809          */
 810         function escapeFullURL( $query = '' ) {
 811                 return htmlspecialchars( $this->getFullURL( $query ) );
 812         }
 813
 814         /**
 815          * Get the URL form for an internal link.
 816          * - Used in various Squid-related code, in case we have a different
 817          * internal hostname for the server from the exposed one.
 818          *
 819          * @param string $query an optional query string
 820          * @return string the URL
 821          * @access public
 822          */
 823         function getInternalURL( $query = '' ) {
 824                 global $wgInternalServer;
 825                 return $wgInternalServer . $this->getLocalURL( $query );
 826         }
 827
 828         /**
 829          * Get the edit URL for this Title
 830          * @return string the URL, or a null string if this is an
 831          *      interwiki link
 832          * @access public
 833          */
 834         function getEditURL() {
 835                 global $wgServer, $wgScript;
 836
 837                 if ( '' != $this->mInterwiki ) { return ''; }
 838                 $s = $this->getLocalURL( 'action=edit' );
 839
 840                 return $s;
 841         }
 842
 843         /**
 844          * Get the HTML-escaped displayable text form.
 845          * Used for the title field in <a> tags.
 846          * @return string the text, including any prefixes
 847          * @access public
 848          */
 849         function getEscapedText() {
 850                 return htmlspecialchars( $this->getPrefixedText() );
 851         }
 852
 853         /**
 854          * Is this Title interwiki?
 855          * @return boolean
 856          * @access public
 857          */
 858         function isExternal() { return ( '' != $this->mInterwiki ); }
 859
 860         /**
 861          * Does the title correspond to a protected article?
 862          * @param string $what the action the page is protected from,
 863          *      by default checks move and edit
 864          * @return boolean
 865          * @access public
 866          */
 867         function isProtected($action = '') {
 868                 if ( -1 == $this->mNamespace ) { return true; }
 869                 if($action == 'edit' || $action == '') {
 870                         $a = $this->getRestrictions("edit");
 871                         if ( in_array( 'sysop', $a ) ) { return true; }
 872                 }
 873                 if($action == 'move' || $action == '') {
 874                         $a = $this->getRestrictions("move");
 875                         if ( in_array( 'sysop', $a ) ) { return true; }
 876                 }
 877                 return false;
 878         }
 879
 880         /**
 881          * Is $wgUser is watching this page?
 882          * @return boolean
 883          * @access public
 884          */
 885         function userIsWatching() {
 886                 global $wgUser;
 887
 888                 if ( is_null( $this->mWatched ) ) {
 889                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 890                                 $this->mWatched = false;
 891                         } else {
 892                                 $this->mWatched = $wgUser->isWatched( $this );
 893                         }
 894                 }
 895                 return $this->mWatched;
 896         }
 897
 898         /**
 899          * Is $wgUser perform $action this page?
 900          * @param string $action action that permission needs to be checked for
 901          * @return boolean
 902          * @access private
 903          */
 904         function userCan($action) {
 905                 $fname = 'Title::userCanEdit';
 906                 wfProfileIn( $fname );
 907
 908                 global $wgUser;
 909                 if( NS_SPECIAL == $this->mNamespace ) {
 910                         wfProfileOut( $fname );
 911                         return false;
 912                 }
 913                 if( NS_MEDIAWIKI == $this->mNamespace &&
 914                     !$wgUser->isAllowed('editinterface') ) {
 915                         wfProfileOut( $fname );
 916                         return false;
 917                 }
 918                 if( $this->mDbkeyform == '_' ) {
 919                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 920                         wfProfileOut( $fname );
 921                         return false;
 922                 }
 923
 924                 # protect global styles and js
 925                 if ( NS_MEDIAWIKI == $this->mNamespace
 926                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 927                      && !$wgUser->isAllowed('editinterface') ) {
 928                         wfProfileOut( $fname );
 929                         return false;
 930                 }
 931
 932                 # protect css/js subpages of user pages
 933                 # XXX: this might be better using restrictions
 934                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 935                 if( NS_USER == $this->mNamespace
 936                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 937                         && !$wgUser->isAllowed('editinterface')
 938                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 939                         wfProfileOut( $fname );
 940                         return false;
 941                 }
 942
 943                 foreach( $this->getRestrictions($action) as $right ) {
 944                         // Backwards compatibility, rewrite sysop -> protect
 945                         if ( $right == 'sysop' ) {
 946                                 $right = 'protect';
 947                         }
 948                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 949                                 wfProfileOut( $fname );
 950                                 return false;
 951                         }
 952                 }
 953
 954                 if( $action == 'move' &&
 955                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 956                         wfProfileOut( $fname );
 957                         return false;
 958                 }
 959
 960                 wfProfileOut( $fname );
 961                 return true;
 962         }
 963
 964         /**
 965          * Can $wgUser edit this page?
 966          * @return boolean
 967          * @access public
 968          */
 969         function userCanEdit() {
 970                 return $this->userCan('edit');
 971         }
 972
 973         /**
 974          * Can $wgUser move this page?
 975          * @return boolean
 976          * @access public
 977          */
 978         function userCanMove() {
 979                 return $this->userCan('move');
 980         }
 981
 982         /**
 983          * Would anybody with sufficient privileges be able to move this page?
 984          * Some pages just aren't movable.
 985          *
 986          * @return boolean
 987          * @access public
 988          */
 989         function isMovable() {
 990                 return Namespace::isMovable( $this->getNamespace() )
 991                         && $this->getInterwiki() == '';
 992         }
 993
 994         /**
 995          * Can $wgUser read this page?
 996          * @return boolean
 997          * @access public
 998          */
 999         function userCanRead() {
1000                 global $wgUser;
1001
1002                 if( $wgUser->isAllowed('read') ) {
1003                         return true;
1004                 } else {
1005                         global $wgWhitelistRead;
1006
1007                         /** If anon users can create an account,
1008                             they need to reach the login page first! */
1009                         if( $wgUser->isAllowed( 'createaccount' )
1010                             && $this->getNamespace() == NS_SPECIAL
1011                             && $this->getText() == 'Userlogin' ) {
1012                                 return true;
1013                         }
1014
1015                         /** some pages are explicitly allowed */
1016                         $name = $this->getPrefixedText();
1017                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1018                                 return true;
1019                         }
1020
1021                         # Compatibility with old settings
1022                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1023                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1024                                         return true;
1025                                 }
1026                         }
1027                 }
1028                 return false;
1029         }
1030
1031         /**
1032          * Is this a talk page of some sort?
1033          * @return bool
1034          * @access public
1035          */
1036         function isTalkPage() {
1037                 return Namespace::isTalk( $this->getNamespace() );
1038         }
1039
1040         /**
1041          * Is this a .css or .js subpage of a user page?
1042          * @return bool
1043          * @access public
1044          */
1045         function isCssJsSubpage() {
1046                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1047         }
1048         /**
1049          * Is this a .css subpage of a user page?
1050          * @return bool
1051          * @access public
1052          */
1053         function isCssSubpage() {
1054                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1055         }
1056         /**
1057          * Is this a .js subpage of a user page?
1058          * @return bool
1059          * @access public
1060          */
1061         function isJsSubpage() {
1062                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1063         }
1064         /**
1065          * Protect css/js subpages of user pages: can $wgUser edit
1066          * this page?
1067          *
1068          * @return boolean
1069          * @todo XXX: this might be better using restrictions
1070          * @access public
1071          */
1072         function userCanEditCssJsSubpage() {
1073                 global $wgUser;
1074                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1075         }
1076
1077         /**
1078          * Loads a string into mRestrictions array
1079          * @param string $res restrictions in string format
1080          * @access public
1081          */
1082         function loadRestrictions( $res ) {
1083                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1084                         $temp = explode( '=', trim( $restrict ) );
1085                         if(count($temp) == 1) {
1086                                 // old format should be treated as edit/move restriction
1087                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1088                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1089                         } else {
1090                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1091                         }
1092                 }
1093                 $this->mRestrictionsLoaded = true;
1094         }
1095
1096         /**
1097          * Accessor/initialisation for mRestrictions
1098          * @param string $action action that permission needs to be checked for
1099          * @return array the array of groups allowed to edit this article
1100          * @access public
1101          */
1102         function getRestrictions($action) {
1103                 $id = $this->getArticleID();
1104                 if ( 0 == $id ) { return array(); }
1105
1106                 if ( ! $this->mRestrictionsLoaded ) {
1107                         $dbr =& wfGetDB( DB_SLAVE );
1108                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1109                         $this->loadRestrictions( $res );
1110                 }
1111                 if( isset( $this->mRestrictions[$action] ) ) {
1112                         return $this->mRestrictions[$action];
1113                 }
1114                 return array();
1115         }
1116
1117         /**
1118          * Is there a version of this page in the deletion archive?
1119          * @return int the number of archived revisions
1120          * @access public
1121          */
1122         function isDeleted() {
1123                 $fname = 'Title::isDeleted';
1124                 if ( $this->getNamespace() < 0 ) {
1125                         $n = 0;
1126                 } else {
1127                         $dbr =& wfGetDB( DB_SLAVE );
1128                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1129                                 'ar_title' => $this->getDBkey() ), $fname );
1130                 }
1131                 return (int)$n;
1132         }
1133
1134         /**
1135          * Get the article ID for this Title from the link cache,
1136          * adding it if necessary
1137          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1138          *      for update
1139          * @return int the ID
1140          * @access public
1141          */
1142         function getArticleID( $flags = 0 ) {
1143                 global $wgLinkCache;
1144                 if ( $flags & GAID_FOR_UPDATE ) {
1145                         $oldUpdate = $wgLinkCache->forUpdate( true );
1146                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1147                         $wgLinkCache->forUpdate( $oldUpdate );
1148                 } else {
1149                         if ( -1 == $this->mArticleID ) {
1150                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1151                         }
1152                 }
1153                 return $this->mArticleID;
1154         }
1155
1156         function getLatestRevID() {
1157                 if ($this->mLatestID !== false)
1158                         return $this->mLatestID;
1159
1160                 $db =& wfGetDB(DB_SLAVE);
1161                 return $this->mLatestID = $db->selectField( 'revision',
1162                         "max(rev_id)",
1163                         array('rev_page' => $this->getArticleID()),
1164                         'Title::getLatestRevID' );
1165         }
1166
1167         /**
1168          * This clears some fields in this object, and clears any associated
1169          * keys in the "bad links" section of $wgLinkCache.
1170          *
1171          * - This is called from Article::insertNewArticle() to allow
1172          * loading of the new page_id. It's also called from
1173          * Article::doDeleteArticle()
1174          *
1175          * @param int $newid the new Article ID
1176          * @access public
1177          */
1178         function resetArticleID( $newid ) {
1179                 global $wgLinkCache;
1180                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1181
1182                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1183                 else { $this->mArticleID = $newid; }
1184                 $this->mRestrictionsLoaded = false;
1185                 $this->mRestrictions = array();
1186         }
1187
1188         /**
1189          * Updates page_touched for this page; called from LinksUpdate.php
1190          * @return bool true if the update succeded
1191          * @access public
1192          */
1193         function invalidateCache() {
1194                 global $wgUseFileCache;
1195
1196                 if ( wfReadOnly() ) {
1197                         return;
1198                 }
1199
1200                 $now = wfTimestampNow();
1201                 $dbw =& wfGetDB( DB_MASTER );
1202                 $success = $dbw->update( 'page',
1203                         array( /* SET */
1204                                 'page_touched' => $dbw->timestamp()
1205                         ), array( /* WHERE */
1206                                 'page_namespace' => $this->getNamespace() ,
1207                                 'page_title' => $this->getDBkey()
1208                         ), 'Title::invalidateCache'
1209                 );
1210
1211                 if ($wgUseFileCache) {
1212                         $cache = new CacheManager($this);
1213                         @unlink($cache->fileCacheName());
1214                 }
1215
1216                 return $success;
1217         }
1218
1219         /**
1220          * Prefix some arbitrary text with the namespace or interwiki prefix
1221          * of this object
1222          *
1223          * @param string $name the text
1224          * @return string the prefixed text
1225          * @access private
1226          */
1227         /* private */ function prefix( $name ) {
1228                 global $wgContLang;
1229
1230                 $p = '';
1231                 if ( '' != $this->mInterwiki ) {
1232                         $p = $this->mInterwiki . ':';
1233                 }
1234                 if ( 0 != $this->mNamespace ) {
1235                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1236                 }
1237                 return $p . $name;
1238         }
1239
1240         /**
1241          * Secure and split - main initialisation function for this object
1242          *
1243          * Assumes that mDbkeyform has been set, and is urldecoded
1244          * and uses underscores, but not otherwise munged.  This function
1245          * removes illegal characters, splits off the interwiki and
1246          * namespace prefixes, sets the other forms, and canonicalizes
1247          * everything.
1248          * @return bool true on success
1249          * @access private
1250          */
1251         /* private */ function secureAndSplit() {
1252                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1253                 $fname = 'Title::secureAndSplit';
1254                 wfProfileIn( $fname );
1255
1256                 # Initialisation
1257                 static $rxTc = false;
1258                 if( !$rxTc ) {
1259                         # % is needed as well
1260                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1261                 }
1262
1263                 $this->mInterwiki = $this->mFragment = '';
1264                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1265
1266                 # Clean up whitespace
1267                 #
1268                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1269                 $t = trim( $t, '_' );
1270
1271                 if ( '' == $t ) {
1272                         wfProfileOut( $fname );
1273                         return false;
1274                 }
1275
1276                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1277                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1278                         wfProfileOut( $fname );
1279                         return false;
1280                 }
1281
1282                 $this->mDbkeyform = $t;
1283
1284                 # Initial colon indicates main namespace rather than specified default
1285                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1286                 if ( ':' == $t{0} ) {
1287                         $this->mNamespace = NS_MAIN;
1288                         $t = substr( $t, 1 ); # remove the colon but continue processing
1289                 }
1290
1291                 # Namespace or interwiki prefix
1292                 $firstPass = true;
1293                 do {
1294                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1295                                 $p = $m[1];
1296                                 $lowerNs = strtolower( $p );
1297                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1298                                         # Canonical namespace
1299                                         $t = $m[2];
1300                                         $this->mNamespace = $ns;
1301                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1302                                         # Ordinary namespace
1303                                         $t = $m[2];
1304                                         $this->mNamespace = $ns;
1305                                 } elseif( $this->getInterwikiLink( $p ) ) {
1306                                         if( !$firstPass ) {
1307                                                 # Can't make a local interwiki link to an interwiki link.
1308                                                 # That's just crazy!
1309                                                 wfProfileOut( $fname );
1310                                                 return false;
1311                                         }
1312
1313                                         # Interwiki link
1314                                         $t = $m[2];
1315                                         $this->mInterwiki = $p;
1316
1317                                         # Redundant interwiki prefix to the local wiki
1318                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1319                                                 if( $t == '' ) {
1320                                                         # Can't have an empty self-link
1321                                                         wfProfileOut( $fname );
1322                                                         return false;
1323                                                 }
1324                                                 $this->mInterwiki = '';
1325                                                 $firstPass = false;
1326                                                 # Do another namespace split...
1327                                                 continue;
1328                                         }
1329                                 }
1330                                 # If there's no recognized interwiki or namespace,
1331                                 # then let the colon expression be part of the title.
1332                         }
1333                         break;
1334                 } while( true );
1335                 $r = $t;
1336
1337                 # We already know that some pages won't be in the database!
1338                 #
1339                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1340                         $this->mArticleID = 0;
1341                 }
1342                 $f = strstr( $r, '#' );
1343                 if ( false !== $f ) {
1344                         $this->mFragment = substr( $f, 1 );
1345                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1346                         # remove whitespace again: prevents "Foo_bar_#"
1347                         # becoming "Foo_bar_"
1348                         $r = preg_replace( '/_*$/', '', $r );
1349                 }
1350
1351                 # Reject illegal characters.
1352                 #
1353                 if( preg_match( $rxTc, $r ) ) {
1354                         wfProfileOut( $fname );
1355                         return false;
1356                 }
1357
1358                 /**
1359                  * Pages with "/./" or "/../" appearing in the URLs will
1360                  * often be unreachable due to the way web browsers deal
1361                  * with 'relative' URLs. Forbid them explicitly.
1362                  */
1363                 if ( strpos( $r, '.' ) !== false &&
1364                      ( $r === '.' || $r === '..' ||
1365                        strpos( $r, './' ) === 0  ||
1366                        strpos( $r, '../' ) === 0 ||
1367                        strpos( $r, '/./' ) !== false ||
1368                        strpos( $r, '/../' ) !== false ) )
1369                 {
1370                         wfProfileOut( $fname );
1371                         return false;
1372                 }
1373
1374                 # We shouldn't need to query the DB for the size.
1375                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1376                 if ( strlen( $r ) > 255 ) {
1377                         wfProfileOut( $fname );
1378                         return false;
1379                 }
1380
1381                 /**
1382                  * Normally, all wiki links are forced to have
1383                  * an initial capital letter so [[foo]] and [[Foo]]
1384                  * point to the same place.
1385                  *
1386                  * Don't force it for interwikis, since the other
1387                  * site might be case-sensitive.
1388                  */
1389                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1390                         $t = $wgContLang->ucfirst( $r );
1391                 } else {
1392                         $t = $r;
1393                 }
1394
1395                 /**
1396                  * Can't make a link to a namespace alone...
1397                  * "empty" local links can only be self-links
1398                  * with a fragment identifier.
1399                  */
1400                 if( $t == '' &&
1401                         $this->mInterwiki == '' &&
1402                         $this->mNamespace != NS_MAIN ) {
1403                         wfProfileOut( $fname );
1404                         return false;
1405                 }
1406
1407                 # Fill fields
1408                 $this->mDbkeyform = $t;
1409                 $this->mUrlform = wfUrlencode( $t );
1410
1411                 $this->mTextform = str_replace( '_', ' ', $t );
1412
1413                 wfProfileOut( $fname );
1414                 return true;
1415         }
1416
1417         /**
1418          * Get a Title object associated with the talk page of this article
1419          * @return Title the object for the talk page
1420          * @access public
1421          */
1422         function getTalkPage() {
1423                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1424         }
1425
1426         /**
1427          * Get a title object associated with the subject page of this
1428          * talk page
1429          *
1430          * @return Title the object for the subject page
1431          * @access public
1432          */
1433         function getSubjectPage() {
1434                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1435         }
1436
1437         /**
1438          * Get an array of Title objects linking to this Title
1439          * Also stores the IDs in the link cache.
1440          *
1441          * @param string $options may be FOR UPDATE
1442          * @return array the Title objects linking here
1443          * @access public
1444          */
1445         function getLinksTo( $options = '' ) {
1446                 global $wgLinkCache;
1447                 $id = $this->getArticleID();
1448
1449                 if ( $options ) {
1450                         $db =& wfGetDB( DB_MASTER );
1451                 } else {
1452                         $db =& wfGetDB( DB_SLAVE );
1453                 }
1454
1455                 $res = $db->select( array( 'page', 'pagelinks' ),
1456                         array( 'page_namespace', 'page_title', 'page_id' ),
1457                         array(
1458                                 'pl_from=page_id',
1459                                 'pl_namespace' => $this->getNamespace(),
1460                                 'pl_title'     => $this->getDbKey() ),
1461                         'Title::getLinksTo',
1462                         $options );
1463
1464                 $retVal = array();
1465                 if ( $db->numRows( $res ) ) {
1466                         while ( $row = $db->fetchObject( $res ) ) {
1467                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1468                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1469                                         $retVal[] = $titleObj;
1470                                 }
1471                         }
1472                 }
1473                 $db->freeResult( $res );
1474                 return $retVal;
1475         }
1476
1477         /**
1478          * Get an array of Title objects referring to non-existent articles linked from this page
1479          *
1480          * @param string $options may be FOR UPDATE
1481          * @return array the Title objects
1482          * @access public
1483          */
1484         function getBrokenLinksFrom( $options = '' ) {
1485                 global $wgLinkCache;
1486
1487                 if ( $options ) {
1488                         $db =& wfGetDB( DB_MASTER );
1489                 } else {
1490                         $db =& wfGetDB( DB_SLAVE );
1491                 }
1492
1493                 $res = $db->safeQuery(
1494                           "SELECT pl_namespace, pl_title
1495                              FROM !
1496                         LEFT JOIN !
1497                                ON pl_namespace=page_namespace
1498                               AND pl_title=page_title
1499                             WHERE pl_from=?
1500                               AND page_namespace IS NULL
1501                                   !",
1502                         $db->tableName( 'pagelinks' ),
1503                         $db->tableName( 'page' ),
1504                         $this->getArticleId(),
1505                         $options );
1506
1507                 $retVal = array();
1508                 if ( $db->numRows( $res ) ) {
1509                         while ( $row = $db->fetchObject( $res ) ) {
1510                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1511                         }
1512                 }
1513                 $db->freeResult( $res );
1514                 return $retVal;
1515         }
1516
1517
1518         /**
1519          * Get a list of URLs to purge from the Squid cache when this
1520          * page changes
1521          *
1522          * @return array the URLs
1523          * @access public
1524          */
1525         function getSquidURLs() {
1526                 return array(
1527                         $this->getInternalURL(),
1528                         $this->getInternalURL( 'action=history' )
1529                 );
1530         }
1531
1532         /**
1533          * Move this page without authentication
1534          * @param Title &$nt the new page Title
1535          * @access public
1536          */
1537         function moveNoAuth( &$nt ) {
1538                 return $this->moveTo( $nt, false );
1539         }
1540
1541         /**
1542          * Check whether a given move operation would be valid.
1543          * Returns true if ok, or a message key string for an error message
1544          * if invalid. (Scarrrrry ugly interface this.)
1545          * @param Title &$nt the new title
1546          * @param bool $auth indicates whether $wgUser's permissions
1547          *      should be checked
1548          * @return mixed true on success, message name on failure
1549          * @access public
1550          */
1551         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1552                 global $wgUser;
1553                 if( !$this or !$nt ) {
1554                         return 'badtitletext';
1555                 }
1556                 if( $this->equals( $nt ) ) {
1557                         return 'selfmove';
1558                 }
1559                 if( !$this->isMovable() || !$nt->isMovable() ) {
1560                         return 'immobile_namespace';
1561                 }
1562
1563                 $fname = 'Title::move';
1564                 $oldid = $this->getArticleID();
1565                 $newid = $nt->getArticleID();
1566
1567                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1568                         return 'articleexists';
1569                 }
1570                 if ( ( '' == $this->getDBkey() ) ||
1571                          ( !$oldid ) ||
1572                      ( '' == $nt->getDBkey() ) ) {
1573                         return 'badarticleerror';
1574                 }
1575
1576                 if ( $auth && (
1577                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1578                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1579                         return 'protectedpage';
1580                 }
1581
1582                 # The move is allowed only if (1) the target doesn't exist, or
1583                 # (2) the target is a redirect to the source, and has no history
1584                 # (so we can undo bad moves right after they're done).
1585
1586                 if ( 0 != $newid ) { # Target exists; check for validity
1587                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1588                                 return 'articleexists';
1589                         }
1590                 }
1591                 return true;
1592         }
1593
1594         /**
1595          * Move a title to a new location
1596          * @param Title &$nt the new title
1597          * @param bool $auth indicates whether $wgUser's permissions
1598          *      should be checked
1599          * @return mixed true on success, message name on failure
1600          * @access public
1601          */
1602         function moveTo( &$nt, $auth = true, $reason = '' ) {
1603                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1604                 if( is_string( $err ) ) {
1605                         return $err;
1606                 }
1607
1608                 $pageid = $this->getArticleID();
1609                 if( $nt->exists() ) {
1610                         $this->moveOverExistingRedirect( $nt, $reason );
1611                         $pageCountChange = 0;
1612                 } else { # Target didn't exist, do normal move.
1613                         $this->moveToNewTitle( $nt, $newid, $reason );
1614                         $pageCountChange = 1;
1615                 }
1616                 $redirid = $this->getArticleID();
1617
1618                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1619                 $dbw =& wfGetDB( DB_MASTER );
1620                 $categorylinks = $dbw->tableName( 'categorylinks' );
1621                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1622                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1623                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1624                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1625
1626                 # Update watchlists
1627
1628                 $oldnamespace = $this->getNamespace() & ~1;
1629                 $newnamespace = $nt->getNamespace() & ~1;
1630                 $oldtitle = $this->getDBkey();
1631                 $newtitle = $nt->getDBkey();
1632
1633                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1634                         WatchedItem::duplicateEntries( $this, $nt );
1635                 }
1636
1637                 # Update search engine
1638                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1639                 $u->doUpdate();
1640                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1641                 $u->doUpdate();
1642
1643                 # Update site_stats
1644                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1645                         # Moved out of main namespace
1646                         # not viewed, edited, removing
1647                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1648                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1649                         # Moved into main namespace
1650                         # not viewed, edited, adding
1651                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1652                 } elseif ( $pageCountChange ) {
1653                         # Added redirect
1654                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1655                 } else{
1656                         $u = false;
1657                 }
1658                 if ( $u ) {
1659                         $u->doUpdate();
1660                 }
1661
1662                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1663                 return true;
1664         }
1665
1666         /**
1667          * Move page to a title which is at present a redirect to the
1668          * source page
1669          *
1670          * @param Title &$nt the page to move to, which should currently
1671          *      be a redirect
1672          * @access private
1673          */
1674         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1675                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1676                 $fname = 'Title::moveOverExistingRedirect';
1677                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1678
1679                 if ( $reason ) {
1680                         $comment .= ": $reason";
1681                 }
1682
1683                 $now = wfTimestampNow();
1684                 $rand = wfRandom();
1685                 $newid = $nt->getArticleID();
1686                 $oldid = $this->getArticleID();
1687                 $dbw =& wfGetDB( DB_MASTER );
1688                 $links = $dbw->tableName( 'links' );
1689
1690                 # Delete the old redirect. We don't save it to history since
1691                 # by definition if we've got here it's rather uninteresting.
1692                 # We have to remove it so that the next step doesn't trigger
1693                 # a conflict on the unique namespace+title index...
1694                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1695
1696                 # Save a null revision in the page's history notifying of the move
1697                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1698                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1699                         true );
1700                 $nullRevId = $nullRevision->insertOn( $dbw );
1701
1702                 # Change the name of the target page:
1703                 $dbw->update( 'page',
1704                         /* SET */ array(
1705                                 'page_touched'   => $dbw->timestamp($now),
1706                                 'page_namespace' => $nt->getNamespace(),
1707                                 'page_title'     => $nt->getDBkey(),
1708                                 'page_latest'    => $nullRevId,
1709                         ),
1710                         /* WHERE */ array( 'page_id' => $oldid ),
1711                         $fname
1712                 );
1713                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1714
1715                 # Recreate the redirect, this time in the other direction.
1716                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1717                 $redirectArticle = new Article( $this );
1718                 $newid = $redirectArticle->insertOn( $dbw );
1719                 $redirectRevision = new Revision( array(
1720                         'page'    => $newid,
1721                         'comment' => $comment,
1722                         'text'    => $redirectText ) );
1723                 $revid = $redirectRevision->insertOn( $dbw );
1724                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1725                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1726
1727                 # Log the move
1728                 $log = new LogPage( 'move' );
1729                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1730
1731                 # Now, we record the link from the redirect to the new title.
1732                 # It should have no other outgoing links...
1733                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1734                 $dbw->insert( 'pagelinks',
1735                         array(
1736                                 'pl_from'      => $newid,
1737                                 'pl_namespace' => $nt->getNamespace(),
1738                                 'pl_title'     => $nt->getDbKey() ),
1739                         $fname );
1740
1741                 # Purge squid
1742                 if ( $wgUseSquid ) {
1743                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1744                         $u = new SquidUpdate( $urls );
1745                         $u->doUpdate();
1746                 }
1747         }
1748
1749         /**
1750          * Move page to non-existing title.
1751          * @param Title &$nt the new Title
1752          * @param int &$newid set to be the new article ID
1753          * @access private
1754          */
1755         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1756                 global $wgUser, $wgLinkCache, $wgUseSquid;
1757                 global $wgMwRedir;
1758                 $fname = 'MovePageForm::moveToNewTitle';
1759                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1760                 if ( $reason ) {
1761                         $comment .= ": $reason";
1762                 }
1763
1764                 $newid = $nt->getArticleID();
1765                 $oldid = $this->getArticleID();
1766                 $dbw =& wfGetDB( DB_MASTER );
1767                 $now = $dbw->timestamp();
1768                 wfSeedRandom();
1769                 $rand = wfRandom();
1770
1771                 # Save a null revision in the page's history notifying of the move
1772                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1773                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1774                         true );
1775                 $nullRevId = $nullRevision->insertOn( $dbw );
1776
1777                 # Rename cur entry
1778                 $dbw->update( 'page',
1779                         /* SET */ array(
1780                                 'page_touched'   => $now,
1781                                 'page_namespace' => $nt->getNamespace(),
1782                                 'page_title'     => $nt->getDBkey(),
1783                                 'page_latest'    => $nullRevId,
1784                         ),
1785                         /* WHERE */ array( 'page_id' => $oldid ),
1786                         $fname
1787                 );
1788
1789                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1790
1791                 # Insert redirect
1792                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1793                 $redirectArticle = new Article( $this );
1794                 $newid = $redirectArticle->insertOn( $dbw );
1795                 $redirectRevision = new Revision( array(
1796                         'page'    => $newid,
1797                         'comment' => $comment,
1798                         'text'    => $redirectText ) );
1799                 $revid = $redirectRevision->insertOn( $dbw );
1800                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1801                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1802
1803                 # Log the move
1804                 $log = new LogPage( 'move' );
1805                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1806
1807                 # Purge caches as per article creation
1808                 Article::onArticleCreate( $nt );
1809
1810                 # Record the just-created redirect's linking to the page
1811                 $dbw->insert( 'pagelinks',
1812                         array(
1813                                 'pl_from'      => $newid,
1814                                 'pl_namespace' => $nt->getNamespace(),
1815                                 'pl_title'     => $nt->getDBkey() ),
1816                         $fname );
1817
1818                 # Non-existent target may have had broken links to it; these must
1819                 # now be touched to update link coloring.
1820                 $nt->touchLinks();
1821
1822                 # Purge old title from squid
1823                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1824                 $titles = $nt->getLinksTo();
1825                 if ( $wgUseSquid ) {
1826                         $urls = $this->getSquidURLs();
1827                         foreach ( $titles as $linkTitle ) {
1828                                 $urls[] = $linkTitle->getInternalURL();
1829                         }
1830                         $u = new SquidUpdate( $urls );
1831                         $u->doUpdate();
1832                 }
1833         }
1834
1835         /**
1836          * Checks if $this can be moved to a given Title
1837          * - Selects for update, so don't call it unless you mean business
1838          *
1839          * @param Title &$nt the new title to check
1840          * @access public
1841          */
1842         function isValidMoveTarget( $nt ) {
1843
1844                 $fname = 'Title::isValidMoveTarget';
1845                 $dbw =& wfGetDB( DB_MASTER );
1846
1847                 # Is it a redirect?
1848                 $id  = $nt->getArticleID();
1849                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1850                         array( 'page_is_redirect','old_text' ),
1851                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1852                         $fname, 'FOR UPDATE' );
1853
1854                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1855                         # Not a redirect
1856                         return false;
1857                 }
1858
1859                 # Does the redirect point to the source?
1860                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1861                         $redirTitle = Title::newFromText( $m[1] );
1862                         if( !is_object( $redirTitle ) ||
1863                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1864                                 return false;
1865                         }
1866                 }
1867
1868                 # Does the article have a history?
1869                 $row = $dbw->selectRow( array( 'page', 'revision'),
1870                         array( 'rev_id' ),
1871                         array( 'page_namespace' => $nt->getNamespace(),
1872                                 'page_title' => $nt->getDBkey(),
1873                                 'page_id=rev_page AND page_latest != rev_id'
1874                         ), $fname, 'FOR UPDATE'
1875                 );
1876
1877                 # Return true if there was no history
1878                 return $row === false;
1879         }
1880
1881         /**
1882          * Create a redirect; fails if the title already exists; does
1883          * not notify RC
1884          *
1885          * @param Title $dest the destination of the redirect
1886          * @param string $comment the comment string describing the move
1887          * @return bool true on success
1888          * @access public
1889          */
1890         function createRedirect( $dest, $comment ) {
1891                 global $wgUser;
1892                 if ( $this->getArticleID() ) {
1893                         return false;
1894                 }
1895
1896                 $fname = 'Title::createRedirect';
1897                 $dbw =& wfGetDB( DB_MASTER );
1898
1899                 $article = new Article( $this );
1900                 $newid = $article->insertOn( $dbw );
1901                 $revision = new Revision( array(
1902                         'page'      => $newid,
1903                         'comment'   => $comment,
1904                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1905                         ) );
1906                 $revisionId = $revision->insertOn( $dbw );
1907                 $article->updateRevisionOn( $dbw, $revision, 0 );
1908
1909                 # Link table
1910                 $dbw->insert( 'pagelinks',
1911                         array(
1912                                 'pl_from'      => $newid,
1913                                 'pl_namespace' => $dest->getNamespace(),
1914                                 'pl_title'     => $dest->getDbKey()
1915                         ), $fname
1916                 );
1917
1918                 Article::onArticleCreate( $this );
1919                 return true;
1920         }
1921
1922         /**
1923          * Get categories to which this Title belongs and return an array of
1924          * categories' names.
1925          *
1926          * @return array an array of parents in the form:
1927          *      $parent => $currentarticle
1928          * @access public
1929          */
1930         function getParentCategories() {
1931                 global $wgContLang,$wgUser;
1932
1933                 $titlekey = $this->getArticleId();
1934                 $sk =& $wgUser->getSkin();
1935                 $parents = array();
1936                 $dbr =& wfGetDB( DB_SLAVE );
1937                 $categorylinks = $dbr->tableName( 'categorylinks' );
1938
1939                 # NEW SQL
1940                 $sql = "SELECT * FROM $categorylinks"
1941                      ." WHERE cl_from='$titlekey'"
1942                          ." AND cl_from <> '0'"
1943                          ." ORDER BY cl_sortkey";
1944
1945                 $res = $dbr->query ( $sql ) ;
1946
1947                 if($dbr->numRows($res) > 0) {
1948                         while ( $x = $dbr->fetchObject ( $res ) )
1949                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1950                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1951                         $dbr->freeResult ( $res ) ;
1952                 } else {
1953                         $data = '';
1954                 }
1955                 return $data;
1956         }
1957
1958         /**
1959          * Get a tree of parent categories
1960          * @param array $children an array with the children in the keys, to check for circular refs
1961          * @return array
1962          * @access public
1963          */
1964         function getParentCategoryTree( $children = array() ) {
1965                 $parents = $this->getParentCategories();
1966
1967                 if($parents != '') {
1968                         foreach($parents as $parent => $current)
1969                         {
1970                                 if ( array_key_exists( $parent, $children ) ) {
1971                                         # Circular reference
1972                                         $stack[$parent] = array();
1973                                 } else {
1974                                         $nt = Title::newFromText($parent);
1975                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1976                                 }
1977                         }
1978                         return $stack;
1979                 } else {
1980                         return array();
1981                 }
1982         }
1983
1984
1985         /**
1986          * Get an associative array for selecting this title from
1987          * the "cur" table
1988          *
1989          * @return array
1990          * @access public
1991          */
1992         function curCond() {
1993                 wfDebugDieBacktrace( 'curCond called' );
1994                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1995         }
1996
1997         /**
1998          * Get an associative array for selecting this title from the
1999          * "old" table
2000          *
2001          * @return array
2002          * @access public
2003          */
2004         function oldCond() {
2005                 wfDebugDieBacktrace( 'oldCond called' );
2006                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
2007         }
2008
2009         /**
2010          * Get the revision ID of the previous revision
2011          *
2012          * @param integer $revision  Revision ID. Get the revision that was before this one.
2013          * @return interger $oldrevision|false
2014          */
2015         function getPreviousRevisionID( $revision ) {
2016                 $dbr =& wfGetDB( DB_SLAVE );
2017                 return $dbr->selectField( 'revision', 'rev_id',
2018                         'rev_page=' . intval( $this->getArticleId() ) .
2019                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2020         }
2021
2022         /**
2023          * Get the revision ID of the next revision
2024          *
2025          * @param integer $revision  Revision ID. Get the revision that was after this one.
2026          * @return interger $oldrevision|false
2027          */
2028         function getNextRevisionID( $revision ) {
2029                 $dbr =& wfGetDB( DB_SLAVE );
2030                 return $dbr->selectField( 'revision', 'rev_id',
2031                         'rev_page=' . intval( $this->getArticleId() ) .
2032                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2033         }
2034
2035         /**
2036          * Compare with another title.
2037          *
2038          * @param Title $title
2039          * @return bool
2040          */
2041         function equals( &$title ) {
2042                 return $this->getInterwiki() == $title->getInterwiki()
2043                         && $this->getNamespace() == $title->getNamespace()
2044                         && $this->getDbkey() == $title->getDbkey();
2045         }
2046
2047         /**
2048          * Check if page exists
2049          * @return bool
2050          */
2051         function exists() {
2052                 return $this->getArticleId() != 0;
2053         }
2054
2055         /**
2056          * Should a link should be displayed as a known link, just based on its title?
2057          *
2058          * Currently, a self-link with a fragment, special pages and image pages are in
2059          * this category. Special pages never exist in the database. Some images do not
2060          * have description pages in the database, but the description page contains
2061          * useful history information that the user may want to link to.
2062          */
2063         function isAlwaysKnown() {
2064                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2065                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2066         }
2067
2068         /**
2069          * Update page_touched timestamps on pages linking to this title.
2070          * In principal, this could be backgrounded and could also do squid
2071          * purging.
2072          */
2073         function touchLinks() {
2074                 $fname = 'Title::touchLinks';
2075
2076                 $dbw =& wfGetDB( DB_MASTER );
2077
2078                 $res = $dbw->select( 'pagelinks',
2079                         array( 'pl_from' ),
2080                         array(
2081                                 'pl_namespace' => $this->getNamespace(),
2082                                 'pl_title'     => $this->getDbKey() ),
2083                         $fname );
2084                 if ( 0 == $dbw->numRows( $res ) ) {
2085                         return;
2086                 }
2087
2088                 $arr = array();
2089                 $toucharr = array();
2090                 while( $row = $dbw->fetchObject( $res ) ) {
2091                         $toucharr[] = $row->pl_from;
2092                 }
2093                 if (!count($toucharr))
2094                         return;
2095                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2096                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2097         }
2098
2099         function trackbackURL() {
2100                 global $wgTitle, $wgScriptPath, $wgServer;
2101
2102                 return "$wgServer$wgScriptPath/trackback.php?article="
2103                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2104         }
2105
2106         function trackbackRDF() {
2107                 $url = htmlspecialchars($this->getFullURL());
2108                 $title = htmlspecialchars($this->getText());
2109                 $tburl = $this->trackbackURL();
2110
2111                 return "
2112 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2113          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2114          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2115 <rdf:Description
2116    rdf:about=\"$url\"
2117    dc:identifier=\"$url\"
2118    dc:title=\"$title\"
2119    trackback:ping=\"$tburl\" />
2120 </rdf:RDF>";
2121         }
2122 }
2123 ?>